diff --git a/examples/sdl_opengl3_example/README.md b/examples/sdl_opengl3_example/README.md index f0b83b2..a0d94cf 100644 --- a/examples/sdl_opengl3_example/README.md +++ b/examples/sdl_opengl3_example/README.md @@ -1,8 +1,22 @@ # How to Build -Link -=== -OpenGL -SDL2 -GLEW \ No newline at end of file +- On Windows with Visual Studio's CLI + +``` +set SDL2DIR=path_to_your_sdl2_folder +cl /Zi /MD /I ..\.. /I ..\libs\gl3w /I %SDL2DIR%\include main.cpp imgui_impl_sdl_gl3.cpp ..\..\imgui*.cpp ..\libs\gl3w\GL\gl3w.c /link /libpath:%SDL2DIR%\lib\x86 SDL2.lib SDL2main.lib opengl32.lib /subsystem:console +``` + +- On Linux and similar Unixes + +``` +c++ `sdl2-config --cflags` -I ../.. -I ../libs/gl3w main.cpp imgui_impl_sdl.cpp ../../imgui*.cpp ../libs/gl3w/GL/gl3w.c `sdl2-config --libs` -lGL -o sdl2example +``` + +- On Mac OS X + +``` +brew install sdl2 +c++ `sdl2-config --cflags` -I ../.. -I ../libs/gl3w main.cpp imgui_impl_sdl.cpp ../../imgui*.cpp ../libs/gl3w/GL/gl3w.c `sdl2-config --libs` -framework OpenGl -o sdl2example +``` diff --git a/examples/sdl_opengl3_example/README.md b/examples/sdl_opengl3_example/README.md index f0b83b2..a0d94cf 100644 --- a/examples/sdl_opengl3_example/README.md +++ b/examples/sdl_opengl3_example/README.md @@ -1,8 +1,22 @@ # How to Build -Link -=== -OpenGL -SDL2 -GLEW \ No newline at end of file +- On Windows with Visual Studio's CLI + +``` +set SDL2DIR=path_to_your_sdl2_folder +cl /Zi /MD /I ..\.. /I ..\libs\gl3w /I %SDL2DIR%\include main.cpp imgui_impl_sdl_gl3.cpp ..\..\imgui*.cpp ..\libs\gl3w\GL\gl3w.c /link /libpath:%SDL2DIR%\lib\x86 SDL2.lib SDL2main.lib opengl32.lib /subsystem:console +``` + +- On Linux and similar Unixes + +``` +c++ `sdl2-config --cflags` -I ../.. -I ../libs/gl3w main.cpp imgui_impl_sdl.cpp ../../imgui*.cpp ../libs/gl3w/GL/gl3w.c `sdl2-config --libs` -lGL -o sdl2example +``` + +- On Mac OS X + +``` +brew install sdl2 +c++ `sdl2-config --cflags` -I ../.. -I ../libs/gl3w main.cpp imgui_impl_sdl.cpp ../../imgui*.cpp ../libs/gl3w/GL/gl3w.c `sdl2-config --libs` -framework OpenGl -o sdl2example +``` diff --git a/examples/sdl_opengl3_example/imgui_impl_sdl_gl3.cpp b/examples/sdl_opengl3_example/imgui_impl_sdl_gl3.cpp new file mode 100644 index 0000000..fdf3ff5 --- /dev/null +++ b/examples/sdl_opengl3_example/imgui_impl_sdl_gl3.cpp @@ -0,0 +1,379 @@ +// ImGui SDL2 binding with OpenGL3 +// https://github.com/ocornut/imgui + +#include +#include +#include +#include "imgui.h" +#include "imgui_impl_sdl_gl3.h" + +// Data +static SDL_Window* g_Window = NULL; +static double g_Time = 0.0f; +static bool g_MousePressed[3] = { false, false, false }; +static float g_MouseWheel = 0.0f; +static GLuint g_FontTexture = 0; +static int g_ShaderHandle = 0, g_VertHandle = 0, g_FragHandle = 0; +static int g_AttribLocationTex = 0, g_AttribLocationProjMtx = 0; +static int g_AttribLocationPosition = 0, g_AttribLocationUV = 0, g_AttribLocationColor = 0; +static unsigned int g_VboHandle = 0, g_VaoHandle = 0, g_ElementsHandle = 0; + +// This is the main rendering function that you have to implement and provide to ImGui (via setting up 'RenderDrawListsFn' in the ImGuiIO structure) +// If text or lines are blurry when integrating ImGui in your engine: +// - in your Render function, try translating your projection matrix by (0.5f,0.5f) or (0.375f,0.375f) +void ImGui_ImplSdlGL3_RenderDrawLists(ImDrawData* draw_data) +{ + // Backup GL state + GLint last_program; glGetIntegerv(GL_CURRENT_PROGRAM, &last_program); + GLint last_texture; glGetIntegerv(GL_TEXTURE_BINDING_2D, &last_texture); + GLint last_array_buffer; glGetIntegerv(GL_ARRAY_BUFFER_BINDING, &last_array_buffer); + GLint last_element_array_buffer; glGetIntegerv(GL_ELEMENT_ARRAY_BUFFER_BINDING, &last_element_array_buffer); + GLint last_vertex_array; glGetIntegerv(GL_VERTEX_ARRAY_BINDING, &last_vertex_array); + GLint last_blend_src; glGetIntegerv(GL_BLEND_SRC, &last_blend_src); + GLint last_blend_dst; glGetIntegerv(GL_BLEND_DST, &last_blend_dst); + GLint last_blend_equation_rgb; glGetIntegerv(GL_BLEND_EQUATION_RGB, &last_blend_equation_rgb); + GLint last_blend_equation_alpha; glGetIntegerv(GL_BLEND_EQUATION_ALPHA, &last_blend_equation_alpha); + GLboolean last_enable_blend = glIsEnabled(GL_BLEND); + GLboolean last_enable_cull_face = glIsEnabled(GL_CULL_FACE); + GLboolean last_enable_depth_test = glIsEnabled(GL_DEPTH_TEST); + GLboolean last_enable_scissor_test = glIsEnabled(GL_SCISSOR_TEST); + + // Setup render state: alpha-blending enabled, no face culling, no depth testing, scissor enabled + glEnable(GL_BLEND); + glBlendEquation(GL_FUNC_ADD); + glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA); + glDisable(GL_CULL_FACE); + glDisable(GL_DEPTH_TEST); + glEnable(GL_SCISSOR_TEST); + glActiveTexture(GL_TEXTURE0); + + // Handle cases of screen coordinates != from framebuffer coordinates (e.g. retina displays) + ImGuiIO& io = ImGui::GetIO(); + float fb_height = io.DisplaySize.y * io.DisplayFramebufferScale.y; + draw_data->ScaleClipRects(io.DisplayFramebufferScale); + + // Setup orthographic projection matrix + const float ortho_projection[4][4] = + { + { 2.0f / io.DisplaySize.x, 0.0f, 0.0f, 0.0f }, + { 0.0f, 2.0f / -io.DisplaySize.y, 0.0f, 0.0f }, + { 0.0f, 0.0f, -1.0f, 0.0f }, + { -1.0f, 1.0f, 0.0f, 1.0f }, + }; + glUseProgram(g_ShaderHandle); + glUniform1i(g_AttribLocationTex, 0); + glUniformMatrix4fv(g_AttribLocationProjMtx, 1, GL_FALSE, &ortho_projection[0][0]); + glBindVertexArray(g_VaoHandle); + + for (int n = 0; n < draw_data->CmdListsCount; n++) + { + const ImDrawList* cmd_list = draw_data->CmdLists[n]; + const ImDrawIdx* idx_buffer_offset = 0; + + glBindBuffer(GL_ARRAY_BUFFER, g_VboHandle); + glBufferData(GL_ARRAY_BUFFER, (GLsizeiptr)cmd_list->VtxBuffer.size() * sizeof(ImDrawVert), (GLvoid*)&cmd_list->VtxBuffer.front(), GL_STREAM_DRAW); + + glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, g_ElementsHandle); + glBufferData(GL_ELEMENT_ARRAY_BUFFER, (GLsizeiptr)cmd_list->IdxBuffer.size() * sizeof(ImDrawIdx), (GLvoid*)&cmd_list->IdxBuffer.front(), GL_STREAM_DRAW); + + for (const ImDrawCmd* pcmd = cmd_list->CmdBuffer.begin(); pcmd != cmd_list->CmdBuffer.end(); pcmd++) + { + if (pcmd->UserCallback) + { + pcmd->UserCallback(cmd_list, pcmd); + } + else + { + glBindTexture(GL_TEXTURE_2D, (GLuint)(intptr_t)pcmd->TextureId); + glScissor((int)pcmd->ClipRect.x, (int)(fb_height - pcmd->ClipRect.w), (int)(pcmd->ClipRect.z - pcmd->ClipRect.x), (int)(pcmd->ClipRect.w - pcmd->ClipRect.y)); + glDrawElements(GL_TRIANGLES, (GLsizei)pcmd->ElemCount, GL_UNSIGNED_SHORT, idx_buffer_offset); + } + idx_buffer_offset += pcmd->ElemCount; + } + } + + // Restore modified GL state + glUseProgram(last_program); + glBindTexture(GL_TEXTURE_2D, last_texture); + glBindBuffer(GL_ARRAY_BUFFER, last_array_buffer); + glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, last_element_array_buffer); + glBindVertexArray(last_vertex_array); + glBlendEquationSeparate(last_blend_equation_rgb, last_blend_equation_alpha); + glBlendFunc(last_blend_src, last_blend_dst); + if (last_enable_blend) glEnable(GL_BLEND); else glDisable(GL_BLEND); + if (last_enable_cull_face) glEnable(GL_CULL_FACE); else glDisable(GL_CULL_FACE); + if (last_enable_depth_test) glEnable(GL_DEPTH_TEST); else glDisable(GL_DEPTH_TEST); + if (last_enable_scissor_test) glEnable(GL_SCISSOR_TEST); else glDisable(GL_SCISSOR_TEST); +} + +static const char* ImGui_ImplSdlGL3_GetClipboardText() +{ + return SDL_GetClipboardText(); +} + +static void ImGui_ImplSdlGL3_SetClipboardText(const char* text) +{ + SDL_SetClipboardText(text); +} + +bool ImGui_ImplSdlGL3_ProcessEvent(SDL_Event* event) +{ + ImGuiIO& io = ImGui::GetIO(); + switch (event->type) + { + case SDL_MOUSEWHEEL: + { + if (event->wheel.y > 0) + g_MouseWheel = 1; + if (event->wheel.y < 0) + g_MouseWheel = -1; + return true; + } + case SDL_MOUSEBUTTONDOWN: + { + if (event->button.button == SDL_BUTTON_LEFT) g_MousePressed[0] = true; + if (event->button.button == SDL_BUTTON_RIGHT) g_MousePressed[1] = true; + if (event->button.button == SDL_BUTTON_MIDDLE) g_MousePressed[2] = true; + return true; + } + case SDL_TEXTINPUT: + { + ImGuiIO& io = ImGui::GetIO(); + io.AddInputCharactersUTF8(event->text.text); + return true; + } + case SDL_KEYDOWN: + case SDL_KEYUP: + { + int key = event->key.keysym.sym & ~SDLK_SCANCODE_MASK; + io.KeysDown[key] = (event->type == SDL_KEYDOWN); + io.KeyShift = ((SDL_GetModState() & KMOD_SHIFT) != 0); + io.KeyCtrl = ((SDL_GetModState() & KMOD_CTRL) != 0); + io.KeyAlt = ((SDL_GetModState() & KMOD_ALT) != 0); + return true; + } + } + return false; +} + +void ImGui_ImplSdlGL3_CreateFontsTexture() +{ + ImGuiIO& io = ImGui::GetIO(); + + // Build texture atlas + unsigned char* pixels; + int width, height; + io.Fonts->GetTexDataAsRGBA32(&pixels, &width, &height); // Load as RGBA 32-bits for OpenGL3 demo because it is more likely to be compatible with user's existing shader. + + // Create OpenGL texture + glGenTextures(1, &g_FontTexture); + glBindTexture(GL_TEXTURE_2D, g_FontTexture); + glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); + glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); + glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, pixels); + + // Store our identifier + io.Fonts->TexID = (void *)(intptr_t)g_FontTexture; + + // Cleanup (don't clear the input data if you want to append new fonts later) + io.Fonts->ClearInputData(); + io.Fonts->ClearTexData(); +} + +bool ImGui_ImplSdlGL3_CreateDeviceObjects() +{ + // Backup GL state + GLint last_texture, last_array_buffer, last_vertex_array; + glGetIntegerv(GL_TEXTURE_BINDING_2D, &last_texture); + glGetIntegerv(GL_ARRAY_BUFFER_BINDING, &last_array_buffer); + glGetIntegerv(GL_VERTEX_ARRAY_BINDING, &last_vertex_array); + + const GLchar *vertex_shader = + "#version 330\n" + "uniform mat4 ProjMtx;\n" + "in vec2 Position;\n" + "in vec2 UV;\n" + "in vec4 Color;\n" + "out vec2 Frag_UV;\n" + "out vec4 Frag_Color;\n" + "void main()\n" + "{\n" + " Frag_UV = UV;\n" + " Frag_Color = Color;\n" + " gl_Position = ProjMtx * vec4(Position.xy,0,1);\n" + "}\n"; + + const GLchar* fragment_shader = + "#version 330\n" + "uniform sampler2D Texture;\n" + "in vec2 Frag_UV;\n" + "in vec4 Frag_Color;\n" + "out vec4 Out_Color;\n" + "void main()\n" + "{\n" + " Out_Color = Frag_Color * texture( Texture, Frag_UV.st);\n" + "}\n"; + + g_ShaderHandle = glCreateProgram(); + g_VertHandle = glCreateShader(GL_VERTEX_SHADER); + g_FragHandle = glCreateShader(GL_FRAGMENT_SHADER); + glShaderSource(g_VertHandle, 1, &vertex_shader, 0); + glShaderSource(g_FragHandle, 1, &fragment_shader, 0); + glCompileShader(g_VertHandle); + glCompileShader(g_FragHandle); + glAttachShader(g_ShaderHandle, g_VertHandle); + glAttachShader(g_ShaderHandle, g_FragHandle); + glLinkProgram(g_ShaderHandle); + + g_AttribLocationTex = glGetUniformLocation(g_ShaderHandle, "Texture"); + g_AttribLocationProjMtx = glGetUniformLocation(g_ShaderHandle, "ProjMtx"); + g_AttribLocationPosition = glGetAttribLocation(g_ShaderHandle, "Position"); + g_AttribLocationUV = glGetAttribLocation(g_ShaderHandle, "UV"); + g_AttribLocationColor = glGetAttribLocation(g_ShaderHandle, "Color"); + + glGenBuffers(1, &g_VboHandle); + glGenBuffers(1, &g_ElementsHandle); + + glGenVertexArrays(1, &g_VaoHandle); + glBindVertexArray(g_VaoHandle); + glBindBuffer(GL_ARRAY_BUFFER, g_VboHandle); + glEnableVertexAttribArray(g_AttribLocationPosition); + glEnableVertexAttribArray(g_AttribLocationUV); + glEnableVertexAttribArray(g_AttribLocationColor); + +#define OFFSETOF(TYPE, ELEMENT) ((size_t)&(((TYPE *)0)->ELEMENT)) + glVertexAttribPointer(g_AttribLocationPosition, 2, GL_FLOAT, GL_FALSE, sizeof(ImDrawVert), (GLvoid*)OFFSETOF(ImDrawVert, pos)); + glVertexAttribPointer(g_AttribLocationUV, 2, GL_FLOAT, GL_FALSE, sizeof(ImDrawVert), (GLvoid*)OFFSETOF(ImDrawVert, uv)); + glVertexAttribPointer(g_AttribLocationColor, 4, GL_UNSIGNED_BYTE, GL_TRUE, sizeof(ImDrawVert), (GLvoid*)OFFSETOF(ImDrawVert, col)); +#undef OFFSETOF + + ImGui_ImplSdlGL3_CreateFontsTexture(); + + // Restore modified GL state + glBindTexture(GL_TEXTURE_2D, last_texture); + glBindBuffer(GL_ARRAY_BUFFER, last_array_buffer); + glBindVertexArray(last_vertex_array); + + return true; +} + +void ImGui_ImplSdlGL3_InvalidateDeviceObjects() +{ + if (g_FontTexture) + { + glDeleteTextures(1, &g_FontTexture); + ImGui::GetIO().Fonts->TexID = 0; + g_FontTexture = 0; + } +} + +bool ImGui_ImplSdlGL3_Init(SDL_Window *window) +{ + g_Window = window; + + ImGuiIO& io = ImGui::GetIO(); + io.KeyMap[ImGuiKey_Tab] = SDLK_TAB; // Keyboard mapping. ImGui will use those indices to peek into the io.KeyDown[] array. + io.KeyMap[ImGuiKey_LeftArrow] = SDL_SCANCODE_LEFT; + io.KeyMap[ImGuiKey_RightArrow] = SDL_SCANCODE_RIGHT; + io.KeyMap[ImGuiKey_UpArrow] = SDL_SCANCODE_UP; + io.KeyMap[ImGuiKey_DownArrow] = SDL_SCANCODE_DOWN; + io.KeyMap[ImGuiKey_PageUp] = SDL_SCANCODE_PAGEUP; + io.KeyMap[ImGuiKey_PageDown] = SDL_SCANCODE_PAGEDOWN; + io.KeyMap[ImGuiKey_Home] = SDL_SCANCODE_HOME; + io.KeyMap[ImGuiKey_End] = SDL_SCANCODE_END; + io.KeyMap[ImGuiKey_Delete] = SDLK_DELETE; + io.KeyMap[ImGuiKey_Backspace] = SDLK_BACKSPACE; + io.KeyMap[ImGuiKey_Enter] = SDLK_RETURN; + io.KeyMap[ImGuiKey_Escape] = SDLK_ESCAPE; + io.KeyMap[ImGuiKey_A] = SDLK_a; + io.KeyMap[ImGuiKey_C] = SDLK_c; + io.KeyMap[ImGuiKey_V] = SDLK_v; + io.KeyMap[ImGuiKey_X] = SDLK_x; + io.KeyMap[ImGuiKey_Y] = SDLK_y; + io.KeyMap[ImGuiKey_Z] = SDLK_z; + + io.RenderDrawListsFn = ImGui_ImplSdlGL3_RenderDrawLists; // Alternatively you can set this to NULL and call ImGui::GetDrawData() after ImGui::Render() to get the same ImDrawData pointer. + io.SetClipboardTextFn = ImGui_ImplSdlGL3_SetClipboardText; + io.GetClipboardTextFn = ImGui_ImplSdlGL3_GetClipboardText; + +#ifdef _WIN32 + SDL_SysWMinfo wmInfo; + SDL_VERSION(&wmInfo.version); + SDL_GetWindowWMInfo(window, &wmInfo); + io.ImeWindowHandle = wmInfo.info.win.window; +#endif + + return true; +} + +void ImGui_ImplSdlGL3_Shutdown() +{ + if (g_VaoHandle) glDeleteVertexArrays(1, &g_VaoHandle); + if (g_VboHandle) glDeleteBuffers(1, &g_VboHandle); + if (g_ElementsHandle) glDeleteBuffers(1, &g_ElementsHandle); + g_VaoHandle = g_VboHandle = g_ElementsHandle = 0; + + glDetachShader(g_ShaderHandle, g_VertHandle); + glDeleteShader(g_VertHandle); + g_VertHandle = 0; + + glDetachShader(g_ShaderHandle, g_FragHandle); + glDeleteShader(g_FragHandle); + g_FragHandle = 0; + + glDeleteProgram(g_ShaderHandle); + g_ShaderHandle = 0; + + if (g_FontTexture) + { + glDeleteTextures(1, &g_FontTexture); + ImGui::GetIO().Fonts->TexID = 0; + g_FontTexture = 0; + } + ImGui::Shutdown(); +} + +void ImGui_ImplSdlGL3_NewFrame(SDL_Window *window) +{ + if (!g_FontTexture) + ImGui_ImplSdlGL3_CreateDeviceObjects(); + + ImGuiIO& io = ImGui::GetIO(); + + // Setup display size (every frame to accommodate for window resizing) + int w, h; + int display_w, display_h; + SDL_GetWindowSize(window, &w, &h); + SDL_GetWindowSize(window, &display_w, &display_h); + io.DisplaySize = ImVec2((float)w, (float)h); + io.DisplayFramebufferScale = ImVec2((float)display_w / w, (float)display_h / h); + + // Setup time step + Uint32 time = SDL_GetTicks(); + double current_time = time / 1000.0; + io.DeltaTime = g_Time > 0.0 ? (float)(current_time - g_Time) : (float)(1.0f / 60.0f); + g_Time = current_time; + + // Setup inputs + // (we already got mouse wheel, keyboard keys & characters from glfw callbacks polled in glfwPollEvents()) + int mx, my; + Uint32 mouseMask = SDL_GetMouseState(&mx, &my); + if (SDL_GetWindowFlags(window) & SDL_WINDOW_MOUSE_FOCUS) + io.MousePos = ImVec2((float)mx, (float)my); // Mouse position, in pixels (set to -1,-1 if no mouse / on another screen, etc.) + else + io.MousePos = ImVec2(-1, -1); + + io.MouseDown[0] = g_MousePressed[0] || (mouseMask & SDL_BUTTON(SDL_BUTTON_LEFT)) != 0; // If a mouse press event came, always pass it as "mouse held this frame", so we don't miss click-release events that are shorter than 1 frame. + io.MouseDown[1] = g_MousePressed[1] || (mouseMask & SDL_BUTTON(SDL_BUTTON_RIGHT)) != 0; + io.MouseDown[2] = g_MousePressed[2] || (mouseMask & SDL_BUTTON(SDL_BUTTON_MIDDLE)) != 0; + g_MousePressed[0] = g_MousePressed[1] = g_MousePressed[2] = false; + + io.MouseWheel = g_MouseWheel; + g_MouseWheel = 0.0f; + + // Hide OS mouse cursor if ImGui is drawing it + SDL_ShowCursor(io.MouseDrawCursor ? 0 : 1); + + // Start the frame + ImGui::NewFrame(); +} \ No newline at end of file diff --git a/examples/sdl_opengl3_example/README.md b/examples/sdl_opengl3_example/README.md index f0b83b2..a0d94cf 100644 --- a/examples/sdl_opengl3_example/README.md +++ b/examples/sdl_opengl3_example/README.md @@ -1,8 +1,22 @@ # How to Build -Link -=== -OpenGL -SDL2 -GLEW \ No newline at end of file +- On Windows with Visual Studio's CLI + +``` +set SDL2DIR=path_to_your_sdl2_folder +cl /Zi /MD /I ..\.. /I ..\libs\gl3w /I %SDL2DIR%\include main.cpp imgui_impl_sdl_gl3.cpp ..\..\imgui*.cpp ..\libs\gl3w\GL\gl3w.c /link /libpath:%SDL2DIR%\lib\x86 SDL2.lib SDL2main.lib opengl32.lib /subsystem:console +``` + +- On Linux and similar Unixes + +``` +c++ `sdl2-config --cflags` -I ../.. -I ../libs/gl3w main.cpp imgui_impl_sdl.cpp ../../imgui*.cpp ../libs/gl3w/GL/gl3w.c `sdl2-config --libs` -lGL -o sdl2example +``` + +- On Mac OS X + +``` +brew install sdl2 +c++ `sdl2-config --cflags` -I ../.. -I ../libs/gl3w main.cpp imgui_impl_sdl.cpp ../../imgui*.cpp ../libs/gl3w/GL/gl3w.c `sdl2-config --libs` -framework OpenGl -o sdl2example +``` diff --git a/examples/sdl_opengl3_example/imgui_impl_sdl_gl3.cpp b/examples/sdl_opengl3_example/imgui_impl_sdl_gl3.cpp new file mode 100644 index 0000000..fdf3ff5 --- /dev/null +++ b/examples/sdl_opengl3_example/imgui_impl_sdl_gl3.cpp @@ -0,0 +1,379 @@ +// ImGui SDL2 binding with OpenGL3 +// https://github.com/ocornut/imgui + +#include +#include +#include +#include "imgui.h" +#include "imgui_impl_sdl_gl3.h" + +// Data +static SDL_Window* g_Window = NULL; +static double g_Time = 0.0f; +static bool g_MousePressed[3] = { false, false, false }; +static float g_MouseWheel = 0.0f; +static GLuint g_FontTexture = 0; +static int g_ShaderHandle = 0, g_VertHandle = 0, g_FragHandle = 0; +static int g_AttribLocationTex = 0, g_AttribLocationProjMtx = 0; +static int g_AttribLocationPosition = 0, g_AttribLocationUV = 0, g_AttribLocationColor = 0; +static unsigned int g_VboHandle = 0, g_VaoHandle = 0, g_ElementsHandle = 0; + +// This is the main rendering function that you have to implement and provide to ImGui (via setting up 'RenderDrawListsFn' in the ImGuiIO structure) +// If text or lines are blurry when integrating ImGui in your engine: +// - in your Render function, try translating your projection matrix by (0.5f,0.5f) or (0.375f,0.375f) +void ImGui_ImplSdlGL3_RenderDrawLists(ImDrawData* draw_data) +{ + // Backup GL state + GLint last_program; glGetIntegerv(GL_CURRENT_PROGRAM, &last_program); + GLint last_texture; glGetIntegerv(GL_TEXTURE_BINDING_2D, &last_texture); + GLint last_array_buffer; glGetIntegerv(GL_ARRAY_BUFFER_BINDING, &last_array_buffer); + GLint last_element_array_buffer; glGetIntegerv(GL_ELEMENT_ARRAY_BUFFER_BINDING, &last_element_array_buffer); + GLint last_vertex_array; glGetIntegerv(GL_VERTEX_ARRAY_BINDING, &last_vertex_array); + GLint last_blend_src; glGetIntegerv(GL_BLEND_SRC, &last_blend_src); + GLint last_blend_dst; glGetIntegerv(GL_BLEND_DST, &last_blend_dst); + GLint last_blend_equation_rgb; glGetIntegerv(GL_BLEND_EQUATION_RGB, &last_blend_equation_rgb); + GLint last_blend_equation_alpha; glGetIntegerv(GL_BLEND_EQUATION_ALPHA, &last_blend_equation_alpha); + GLboolean last_enable_blend = glIsEnabled(GL_BLEND); + GLboolean last_enable_cull_face = glIsEnabled(GL_CULL_FACE); + GLboolean last_enable_depth_test = glIsEnabled(GL_DEPTH_TEST); + GLboolean last_enable_scissor_test = glIsEnabled(GL_SCISSOR_TEST); + + // Setup render state: alpha-blending enabled, no face culling, no depth testing, scissor enabled + glEnable(GL_BLEND); + glBlendEquation(GL_FUNC_ADD); + glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA); + glDisable(GL_CULL_FACE); + glDisable(GL_DEPTH_TEST); + glEnable(GL_SCISSOR_TEST); + glActiveTexture(GL_TEXTURE0); + + // Handle cases of screen coordinates != from framebuffer coordinates (e.g. retina displays) + ImGuiIO& io = ImGui::GetIO(); + float fb_height = io.DisplaySize.y * io.DisplayFramebufferScale.y; + draw_data->ScaleClipRects(io.DisplayFramebufferScale); + + // Setup orthographic projection matrix + const float ortho_projection[4][4] = + { + { 2.0f / io.DisplaySize.x, 0.0f, 0.0f, 0.0f }, + { 0.0f, 2.0f / -io.DisplaySize.y, 0.0f, 0.0f }, + { 0.0f, 0.0f, -1.0f, 0.0f }, + { -1.0f, 1.0f, 0.0f, 1.0f }, + }; + glUseProgram(g_ShaderHandle); + glUniform1i(g_AttribLocationTex, 0); + glUniformMatrix4fv(g_AttribLocationProjMtx, 1, GL_FALSE, &ortho_projection[0][0]); + glBindVertexArray(g_VaoHandle); + + for (int n = 0; n < draw_data->CmdListsCount; n++) + { + const ImDrawList* cmd_list = draw_data->CmdLists[n]; + const ImDrawIdx* idx_buffer_offset = 0; + + glBindBuffer(GL_ARRAY_BUFFER, g_VboHandle); + glBufferData(GL_ARRAY_BUFFER, (GLsizeiptr)cmd_list->VtxBuffer.size() * sizeof(ImDrawVert), (GLvoid*)&cmd_list->VtxBuffer.front(), GL_STREAM_DRAW); + + glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, g_ElementsHandle); + glBufferData(GL_ELEMENT_ARRAY_BUFFER, (GLsizeiptr)cmd_list->IdxBuffer.size() * sizeof(ImDrawIdx), (GLvoid*)&cmd_list->IdxBuffer.front(), GL_STREAM_DRAW); + + for (const ImDrawCmd* pcmd = cmd_list->CmdBuffer.begin(); pcmd != cmd_list->CmdBuffer.end(); pcmd++) + { + if (pcmd->UserCallback) + { + pcmd->UserCallback(cmd_list, pcmd); + } + else + { + glBindTexture(GL_TEXTURE_2D, (GLuint)(intptr_t)pcmd->TextureId); + glScissor((int)pcmd->ClipRect.x, (int)(fb_height - pcmd->ClipRect.w), (int)(pcmd->ClipRect.z - pcmd->ClipRect.x), (int)(pcmd->ClipRect.w - pcmd->ClipRect.y)); + glDrawElements(GL_TRIANGLES, (GLsizei)pcmd->ElemCount, GL_UNSIGNED_SHORT, idx_buffer_offset); + } + idx_buffer_offset += pcmd->ElemCount; + } + } + + // Restore modified GL state + glUseProgram(last_program); + glBindTexture(GL_TEXTURE_2D, last_texture); + glBindBuffer(GL_ARRAY_BUFFER, last_array_buffer); + glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, last_element_array_buffer); + glBindVertexArray(last_vertex_array); + glBlendEquationSeparate(last_blend_equation_rgb, last_blend_equation_alpha); + glBlendFunc(last_blend_src, last_blend_dst); + if (last_enable_blend) glEnable(GL_BLEND); else glDisable(GL_BLEND); + if (last_enable_cull_face) glEnable(GL_CULL_FACE); else glDisable(GL_CULL_FACE); + if (last_enable_depth_test) glEnable(GL_DEPTH_TEST); else glDisable(GL_DEPTH_TEST); + if (last_enable_scissor_test) glEnable(GL_SCISSOR_TEST); else glDisable(GL_SCISSOR_TEST); +} + +static const char* ImGui_ImplSdlGL3_GetClipboardText() +{ + return SDL_GetClipboardText(); +} + +static void ImGui_ImplSdlGL3_SetClipboardText(const char* text) +{ + SDL_SetClipboardText(text); +} + +bool ImGui_ImplSdlGL3_ProcessEvent(SDL_Event* event) +{ + ImGuiIO& io = ImGui::GetIO(); + switch (event->type) + { + case SDL_MOUSEWHEEL: + { + if (event->wheel.y > 0) + g_MouseWheel = 1; + if (event->wheel.y < 0) + g_MouseWheel = -1; + return true; + } + case SDL_MOUSEBUTTONDOWN: + { + if (event->button.button == SDL_BUTTON_LEFT) g_MousePressed[0] = true; + if (event->button.button == SDL_BUTTON_RIGHT) g_MousePressed[1] = true; + if (event->button.button == SDL_BUTTON_MIDDLE) g_MousePressed[2] = true; + return true; + } + case SDL_TEXTINPUT: + { + ImGuiIO& io = ImGui::GetIO(); + io.AddInputCharactersUTF8(event->text.text); + return true; + } + case SDL_KEYDOWN: + case SDL_KEYUP: + { + int key = event->key.keysym.sym & ~SDLK_SCANCODE_MASK; + io.KeysDown[key] = (event->type == SDL_KEYDOWN); + io.KeyShift = ((SDL_GetModState() & KMOD_SHIFT) != 0); + io.KeyCtrl = ((SDL_GetModState() & KMOD_CTRL) != 0); + io.KeyAlt = ((SDL_GetModState() & KMOD_ALT) != 0); + return true; + } + } + return false; +} + +void ImGui_ImplSdlGL3_CreateFontsTexture() +{ + ImGuiIO& io = ImGui::GetIO(); + + // Build texture atlas + unsigned char* pixels; + int width, height; + io.Fonts->GetTexDataAsRGBA32(&pixels, &width, &height); // Load as RGBA 32-bits for OpenGL3 demo because it is more likely to be compatible with user's existing shader. + + // Create OpenGL texture + glGenTextures(1, &g_FontTexture); + glBindTexture(GL_TEXTURE_2D, g_FontTexture); + glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); + glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); + glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, pixels); + + // Store our identifier + io.Fonts->TexID = (void *)(intptr_t)g_FontTexture; + + // Cleanup (don't clear the input data if you want to append new fonts later) + io.Fonts->ClearInputData(); + io.Fonts->ClearTexData(); +} + +bool ImGui_ImplSdlGL3_CreateDeviceObjects() +{ + // Backup GL state + GLint last_texture, last_array_buffer, last_vertex_array; + glGetIntegerv(GL_TEXTURE_BINDING_2D, &last_texture); + glGetIntegerv(GL_ARRAY_BUFFER_BINDING, &last_array_buffer); + glGetIntegerv(GL_VERTEX_ARRAY_BINDING, &last_vertex_array); + + const GLchar *vertex_shader = + "#version 330\n" + "uniform mat4 ProjMtx;\n" + "in vec2 Position;\n" + "in vec2 UV;\n" + "in vec4 Color;\n" + "out vec2 Frag_UV;\n" + "out vec4 Frag_Color;\n" + "void main()\n" + "{\n" + " Frag_UV = UV;\n" + " Frag_Color = Color;\n" + " gl_Position = ProjMtx * vec4(Position.xy,0,1);\n" + "}\n"; + + const GLchar* fragment_shader = + "#version 330\n" + "uniform sampler2D Texture;\n" + "in vec2 Frag_UV;\n" + "in vec4 Frag_Color;\n" + "out vec4 Out_Color;\n" + "void main()\n" + "{\n" + " Out_Color = Frag_Color * texture( Texture, Frag_UV.st);\n" + "}\n"; + + g_ShaderHandle = glCreateProgram(); + g_VertHandle = glCreateShader(GL_VERTEX_SHADER); + g_FragHandle = glCreateShader(GL_FRAGMENT_SHADER); + glShaderSource(g_VertHandle, 1, &vertex_shader, 0); + glShaderSource(g_FragHandle, 1, &fragment_shader, 0); + glCompileShader(g_VertHandle); + glCompileShader(g_FragHandle); + glAttachShader(g_ShaderHandle, g_VertHandle); + glAttachShader(g_ShaderHandle, g_FragHandle); + glLinkProgram(g_ShaderHandle); + + g_AttribLocationTex = glGetUniformLocation(g_ShaderHandle, "Texture"); + g_AttribLocationProjMtx = glGetUniformLocation(g_ShaderHandle, "ProjMtx"); + g_AttribLocationPosition = glGetAttribLocation(g_ShaderHandle, "Position"); + g_AttribLocationUV = glGetAttribLocation(g_ShaderHandle, "UV"); + g_AttribLocationColor = glGetAttribLocation(g_ShaderHandle, "Color"); + + glGenBuffers(1, &g_VboHandle); + glGenBuffers(1, &g_ElementsHandle); + + glGenVertexArrays(1, &g_VaoHandle); + glBindVertexArray(g_VaoHandle); + glBindBuffer(GL_ARRAY_BUFFER, g_VboHandle); + glEnableVertexAttribArray(g_AttribLocationPosition); + glEnableVertexAttribArray(g_AttribLocationUV); + glEnableVertexAttribArray(g_AttribLocationColor); + +#define OFFSETOF(TYPE, ELEMENT) ((size_t)&(((TYPE *)0)->ELEMENT)) + glVertexAttribPointer(g_AttribLocationPosition, 2, GL_FLOAT, GL_FALSE, sizeof(ImDrawVert), (GLvoid*)OFFSETOF(ImDrawVert, pos)); + glVertexAttribPointer(g_AttribLocationUV, 2, GL_FLOAT, GL_FALSE, sizeof(ImDrawVert), (GLvoid*)OFFSETOF(ImDrawVert, uv)); + glVertexAttribPointer(g_AttribLocationColor, 4, GL_UNSIGNED_BYTE, GL_TRUE, sizeof(ImDrawVert), (GLvoid*)OFFSETOF(ImDrawVert, col)); +#undef OFFSETOF + + ImGui_ImplSdlGL3_CreateFontsTexture(); + + // Restore modified GL state + glBindTexture(GL_TEXTURE_2D, last_texture); + glBindBuffer(GL_ARRAY_BUFFER, last_array_buffer); + glBindVertexArray(last_vertex_array); + + return true; +} + +void ImGui_ImplSdlGL3_InvalidateDeviceObjects() +{ + if (g_FontTexture) + { + glDeleteTextures(1, &g_FontTexture); + ImGui::GetIO().Fonts->TexID = 0; + g_FontTexture = 0; + } +} + +bool ImGui_ImplSdlGL3_Init(SDL_Window *window) +{ + g_Window = window; + + ImGuiIO& io = ImGui::GetIO(); + io.KeyMap[ImGuiKey_Tab] = SDLK_TAB; // Keyboard mapping. ImGui will use those indices to peek into the io.KeyDown[] array. + io.KeyMap[ImGuiKey_LeftArrow] = SDL_SCANCODE_LEFT; + io.KeyMap[ImGuiKey_RightArrow] = SDL_SCANCODE_RIGHT; + io.KeyMap[ImGuiKey_UpArrow] = SDL_SCANCODE_UP; + io.KeyMap[ImGuiKey_DownArrow] = SDL_SCANCODE_DOWN; + io.KeyMap[ImGuiKey_PageUp] = SDL_SCANCODE_PAGEUP; + io.KeyMap[ImGuiKey_PageDown] = SDL_SCANCODE_PAGEDOWN; + io.KeyMap[ImGuiKey_Home] = SDL_SCANCODE_HOME; + io.KeyMap[ImGuiKey_End] = SDL_SCANCODE_END; + io.KeyMap[ImGuiKey_Delete] = SDLK_DELETE; + io.KeyMap[ImGuiKey_Backspace] = SDLK_BACKSPACE; + io.KeyMap[ImGuiKey_Enter] = SDLK_RETURN; + io.KeyMap[ImGuiKey_Escape] = SDLK_ESCAPE; + io.KeyMap[ImGuiKey_A] = SDLK_a; + io.KeyMap[ImGuiKey_C] = SDLK_c; + io.KeyMap[ImGuiKey_V] = SDLK_v; + io.KeyMap[ImGuiKey_X] = SDLK_x; + io.KeyMap[ImGuiKey_Y] = SDLK_y; + io.KeyMap[ImGuiKey_Z] = SDLK_z; + + io.RenderDrawListsFn = ImGui_ImplSdlGL3_RenderDrawLists; // Alternatively you can set this to NULL and call ImGui::GetDrawData() after ImGui::Render() to get the same ImDrawData pointer. + io.SetClipboardTextFn = ImGui_ImplSdlGL3_SetClipboardText; + io.GetClipboardTextFn = ImGui_ImplSdlGL3_GetClipboardText; + +#ifdef _WIN32 + SDL_SysWMinfo wmInfo; + SDL_VERSION(&wmInfo.version); + SDL_GetWindowWMInfo(window, &wmInfo); + io.ImeWindowHandle = wmInfo.info.win.window; +#endif + + return true; +} + +void ImGui_ImplSdlGL3_Shutdown() +{ + if (g_VaoHandle) glDeleteVertexArrays(1, &g_VaoHandle); + if (g_VboHandle) glDeleteBuffers(1, &g_VboHandle); + if (g_ElementsHandle) glDeleteBuffers(1, &g_ElementsHandle); + g_VaoHandle = g_VboHandle = g_ElementsHandle = 0; + + glDetachShader(g_ShaderHandle, g_VertHandle); + glDeleteShader(g_VertHandle); + g_VertHandle = 0; + + glDetachShader(g_ShaderHandle, g_FragHandle); + glDeleteShader(g_FragHandle); + g_FragHandle = 0; + + glDeleteProgram(g_ShaderHandle); + g_ShaderHandle = 0; + + if (g_FontTexture) + { + glDeleteTextures(1, &g_FontTexture); + ImGui::GetIO().Fonts->TexID = 0; + g_FontTexture = 0; + } + ImGui::Shutdown(); +} + +void ImGui_ImplSdlGL3_NewFrame(SDL_Window *window) +{ + if (!g_FontTexture) + ImGui_ImplSdlGL3_CreateDeviceObjects(); + + ImGuiIO& io = ImGui::GetIO(); + + // Setup display size (every frame to accommodate for window resizing) + int w, h; + int display_w, display_h; + SDL_GetWindowSize(window, &w, &h); + SDL_GetWindowSize(window, &display_w, &display_h); + io.DisplaySize = ImVec2((float)w, (float)h); + io.DisplayFramebufferScale = ImVec2((float)display_w / w, (float)display_h / h); + + // Setup time step + Uint32 time = SDL_GetTicks(); + double current_time = time / 1000.0; + io.DeltaTime = g_Time > 0.0 ? (float)(current_time - g_Time) : (float)(1.0f / 60.0f); + g_Time = current_time; + + // Setup inputs + // (we already got mouse wheel, keyboard keys & characters from glfw callbacks polled in glfwPollEvents()) + int mx, my; + Uint32 mouseMask = SDL_GetMouseState(&mx, &my); + if (SDL_GetWindowFlags(window) & SDL_WINDOW_MOUSE_FOCUS) + io.MousePos = ImVec2((float)mx, (float)my); // Mouse position, in pixels (set to -1,-1 if no mouse / on another screen, etc.) + else + io.MousePos = ImVec2(-1, -1); + + io.MouseDown[0] = g_MousePressed[0] || (mouseMask & SDL_BUTTON(SDL_BUTTON_LEFT)) != 0; // If a mouse press event came, always pass it as "mouse held this frame", so we don't miss click-release events that are shorter than 1 frame. + io.MouseDown[1] = g_MousePressed[1] || (mouseMask & SDL_BUTTON(SDL_BUTTON_RIGHT)) != 0; + io.MouseDown[2] = g_MousePressed[2] || (mouseMask & SDL_BUTTON(SDL_BUTTON_MIDDLE)) != 0; + g_MousePressed[0] = g_MousePressed[1] = g_MousePressed[2] = false; + + io.MouseWheel = g_MouseWheel; + g_MouseWheel = 0.0f; + + // Hide OS mouse cursor if ImGui is drawing it + SDL_ShowCursor(io.MouseDrawCursor ? 0 : 1); + + // Start the frame + ImGui::NewFrame(); +} \ No newline at end of file diff --git a/examples/sdl_opengl3_example/imgui_impl_sdl_gl3.h b/examples/sdl_opengl3_example/imgui_impl_sdl_gl3.h new file mode 100644 index 0000000..e324b3d --- /dev/null +++ b/examples/sdl_opengl3_example/imgui_impl_sdl_gl3.h @@ -0,0 +1,14 @@ +// ImGui SDL2 binding with OpenGL3 +// https://github.com/ocornut/imgui + +struct SDL_Window; +typedef union SDL_Event SDL_Event; + +IMGUI_API bool ImGui_ImplSdlGL3_Init(SDL_Window *window); +IMGUI_API void ImGui_ImplSdlGL3_Shutdown(); +IMGUI_API void ImGui_ImplSdlGL3_NewFrame(SDL_Window *window); +IMGUI_API bool ImGui_ImplSdlGL3_ProcessEvent(SDL_Event* event); + +// Use if you want to reset your rendering device without losing ImGui state. +IMGUI_API void ImGui_ImplSdlGL3_InvalidateDeviceObjects(); +IMGUI_API bool ImGui_ImplSdlGL3_CreateDeviceObjects(); diff --git a/examples/sdl_opengl3_example/README.md b/examples/sdl_opengl3_example/README.md index f0b83b2..a0d94cf 100644 --- a/examples/sdl_opengl3_example/README.md +++ b/examples/sdl_opengl3_example/README.md @@ -1,8 +1,22 @@ # How to Build -Link -=== -OpenGL -SDL2 -GLEW \ No newline at end of file +- On Windows with Visual Studio's CLI + +``` +set SDL2DIR=path_to_your_sdl2_folder +cl /Zi /MD /I ..\.. /I ..\libs\gl3w /I %SDL2DIR%\include main.cpp imgui_impl_sdl_gl3.cpp ..\..\imgui*.cpp ..\libs\gl3w\GL\gl3w.c /link /libpath:%SDL2DIR%\lib\x86 SDL2.lib SDL2main.lib opengl32.lib /subsystem:console +``` + +- On Linux and similar Unixes + +``` +c++ `sdl2-config --cflags` -I ../.. -I ../libs/gl3w main.cpp imgui_impl_sdl.cpp ../../imgui*.cpp ../libs/gl3w/GL/gl3w.c `sdl2-config --libs` -lGL -o sdl2example +``` + +- On Mac OS X + +``` +brew install sdl2 +c++ `sdl2-config --cflags` -I ../.. -I ../libs/gl3w main.cpp imgui_impl_sdl.cpp ../../imgui*.cpp ../libs/gl3w/GL/gl3w.c `sdl2-config --libs` -framework OpenGl -o sdl2example +``` diff --git a/examples/sdl_opengl3_example/imgui_impl_sdl_gl3.cpp b/examples/sdl_opengl3_example/imgui_impl_sdl_gl3.cpp new file mode 100644 index 0000000..fdf3ff5 --- /dev/null +++ b/examples/sdl_opengl3_example/imgui_impl_sdl_gl3.cpp @@ -0,0 +1,379 @@ +// ImGui SDL2 binding with OpenGL3 +// https://github.com/ocornut/imgui + +#include +#include +#include +#include "imgui.h" +#include "imgui_impl_sdl_gl3.h" + +// Data +static SDL_Window* g_Window = NULL; +static double g_Time = 0.0f; +static bool g_MousePressed[3] = { false, false, false }; +static float g_MouseWheel = 0.0f; +static GLuint g_FontTexture = 0; +static int g_ShaderHandle = 0, g_VertHandle = 0, g_FragHandle = 0; +static int g_AttribLocationTex = 0, g_AttribLocationProjMtx = 0; +static int g_AttribLocationPosition = 0, g_AttribLocationUV = 0, g_AttribLocationColor = 0; +static unsigned int g_VboHandle = 0, g_VaoHandle = 0, g_ElementsHandle = 0; + +// This is the main rendering function that you have to implement and provide to ImGui (via setting up 'RenderDrawListsFn' in the ImGuiIO structure) +// If text or lines are blurry when integrating ImGui in your engine: +// - in your Render function, try translating your projection matrix by (0.5f,0.5f) or (0.375f,0.375f) +void ImGui_ImplSdlGL3_RenderDrawLists(ImDrawData* draw_data) +{ + // Backup GL state + GLint last_program; glGetIntegerv(GL_CURRENT_PROGRAM, &last_program); + GLint last_texture; glGetIntegerv(GL_TEXTURE_BINDING_2D, &last_texture); + GLint last_array_buffer; glGetIntegerv(GL_ARRAY_BUFFER_BINDING, &last_array_buffer); + GLint last_element_array_buffer; glGetIntegerv(GL_ELEMENT_ARRAY_BUFFER_BINDING, &last_element_array_buffer); + GLint last_vertex_array; glGetIntegerv(GL_VERTEX_ARRAY_BINDING, &last_vertex_array); + GLint last_blend_src; glGetIntegerv(GL_BLEND_SRC, &last_blend_src); + GLint last_blend_dst; glGetIntegerv(GL_BLEND_DST, &last_blend_dst); + GLint last_blend_equation_rgb; glGetIntegerv(GL_BLEND_EQUATION_RGB, &last_blend_equation_rgb); + GLint last_blend_equation_alpha; glGetIntegerv(GL_BLEND_EQUATION_ALPHA, &last_blend_equation_alpha); + GLboolean last_enable_blend = glIsEnabled(GL_BLEND); + GLboolean last_enable_cull_face = glIsEnabled(GL_CULL_FACE); + GLboolean last_enable_depth_test = glIsEnabled(GL_DEPTH_TEST); + GLboolean last_enable_scissor_test = glIsEnabled(GL_SCISSOR_TEST); + + // Setup render state: alpha-blending enabled, no face culling, no depth testing, scissor enabled + glEnable(GL_BLEND); + glBlendEquation(GL_FUNC_ADD); + glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA); + glDisable(GL_CULL_FACE); + glDisable(GL_DEPTH_TEST); + glEnable(GL_SCISSOR_TEST); + glActiveTexture(GL_TEXTURE0); + + // Handle cases of screen coordinates != from framebuffer coordinates (e.g. retina displays) + ImGuiIO& io = ImGui::GetIO(); + float fb_height = io.DisplaySize.y * io.DisplayFramebufferScale.y; + draw_data->ScaleClipRects(io.DisplayFramebufferScale); + + // Setup orthographic projection matrix + const float ortho_projection[4][4] = + { + { 2.0f / io.DisplaySize.x, 0.0f, 0.0f, 0.0f }, + { 0.0f, 2.0f / -io.DisplaySize.y, 0.0f, 0.0f }, + { 0.0f, 0.0f, -1.0f, 0.0f }, + { -1.0f, 1.0f, 0.0f, 1.0f }, + }; + glUseProgram(g_ShaderHandle); + glUniform1i(g_AttribLocationTex, 0); + glUniformMatrix4fv(g_AttribLocationProjMtx, 1, GL_FALSE, &ortho_projection[0][0]); + glBindVertexArray(g_VaoHandle); + + for (int n = 0; n < draw_data->CmdListsCount; n++) + { + const ImDrawList* cmd_list = draw_data->CmdLists[n]; + const ImDrawIdx* idx_buffer_offset = 0; + + glBindBuffer(GL_ARRAY_BUFFER, g_VboHandle); + glBufferData(GL_ARRAY_BUFFER, (GLsizeiptr)cmd_list->VtxBuffer.size() * sizeof(ImDrawVert), (GLvoid*)&cmd_list->VtxBuffer.front(), GL_STREAM_DRAW); + + glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, g_ElementsHandle); + glBufferData(GL_ELEMENT_ARRAY_BUFFER, (GLsizeiptr)cmd_list->IdxBuffer.size() * sizeof(ImDrawIdx), (GLvoid*)&cmd_list->IdxBuffer.front(), GL_STREAM_DRAW); + + for (const ImDrawCmd* pcmd = cmd_list->CmdBuffer.begin(); pcmd != cmd_list->CmdBuffer.end(); pcmd++) + { + if (pcmd->UserCallback) + { + pcmd->UserCallback(cmd_list, pcmd); + } + else + { + glBindTexture(GL_TEXTURE_2D, (GLuint)(intptr_t)pcmd->TextureId); + glScissor((int)pcmd->ClipRect.x, (int)(fb_height - pcmd->ClipRect.w), (int)(pcmd->ClipRect.z - pcmd->ClipRect.x), (int)(pcmd->ClipRect.w - pcmd->ClipRect.y)); + glDrawElements(GL_TRIANGLES, (GLsizei)pcmd->ElemCount, GL_UNSIGNED_SHORT, idx_buffer_offset); + } + idx_buffer_offset += pcmd->ElemCount; + } + } + + // Restore modified GL state + glUseProgram(last_program); + glBindTexture(GL_TEXTURE_2D, last_texture); + glBindBuffer(GL_ARRAY_BUFFER, last_array_buffer); + glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, last_element_array_buffer); + glBindVertexArray(last_vertex_array); + glBlendEquationSeparate(last_blend_equation_rgb, last_blend_equation_alpha); + glBlendFunc(last_blend_src, last_blend_dst); + if (last_enable_blend) glEnable(GL_BLEND); else glDisable(GL_BLEND); + if (last_enable_cull_face) glEnable(GL_CULL_FACE); else glDisable(GL_CULL_FACE); + if (last_enable_depth_test) glEnable(GL_DEPTH_TEST); else glDisable(GL_DEPTH_TEST); + if (last_enable_scissor_test) glEnable(GL_SCISSOR_TEST); else glDisable(GL_SCISSOR_TEST); +} + +static const char* ImGui_ImplSdlGL3_GetClipboardText() +{ + return SDL_GetClipboardText(); +} + +static void ImGui_ImplSdlGL3_SetClipboardText(const char* text) +{ + SDL_SetClipboardText(text); +} + +bool ImGui_ImplSdlGL3_ProcessEvent(SDL_Event* event) +{ + ImGuiIO& io = ImGui::GetIO(); + switch (event->type) + { + case SDL_MOUSEWHEEL: + { + if (event->wheel.y > 0) + g_MouseWheel = 1; + if (event->wheel.y < 0) + g_MouseWheel = -1; + return true; + } + case SDL_MOUSEBUTTONDOWN: + { + if (event->button.button == SDL_BUTTON_LEFT) g_MousePressed[0] = true; + if (event->button.button == SDL_BUTTON_RIGHT) g_MousePressed[1] = true; + if (event->button.button == SDL_BUTTON_MIDDLE) g_MousePressed[2] = true; + return true; + } + case SDL_TEXTINPUT: + { + ImGuiIO& io = ImGui::GetIO(); + io.AddInputCharactersUTF8(event->text.text); + return true; + } + case SDL_KEYDOWN: + case SDL_KEYUP: + { + int key = event->key.keysym.sym & ~SDLK_SCANCODE_MASK; + io.KeysDown[key] = (event->type == SDL_KEYDOWN); + io.KeyShift = ((SDL_GetModState() & KMOD_SHIFT) != 0); + io.KeyCtrl = ((SDL_GetModState() & KMOD_CTRL) != 0); + io.KeyAlt = ((SDL_GetModState() & KMOD_ALT) != 0); + return true; + } + } + return false; +} + +void ImGui_ImplSdlGL3_CreateFontsTexture() +{ + ImGuiIO& io = ImGui::GetIO(); + + // Build texture atlas + unsigned char* pixels; + int width, height; + io.Fonts->GetTexDataAsRGBA32(&pixels, &width, &height); // Load as RGBA 32-bits for OpenGL3 demo because it is more likely to be compatible with user's existing shader. + + // Create OpenGL texture + glGenTextures(1, &g_FontTexture); + glBindTexture(GL_TEXTURE_2D, g_FontTexture); + glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); + glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); + glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, pixels); + + // Store our identifier + io.Fonts->TexID = (void *)(intptr_t)g_FontTexture; + + // Cleanup (don't clear the input data if you want to append new fonts later) + io.Fonts->ClearInputData(); + io.Fonts->ClearTexData(); +} + +bool ImGui_ImplSdlGL3_CreateDeviceObjects() +{ + // Backup GL state + GLint last_texture, last_array_buffer, last_vertex_array; + glGetIntegerv(GL_TEXTURE_BINDING_2D, &last_texture); + glGetIntegerv(GL_ARRAY_BUFFER_BINDING, &last_array_buffer); + glGetIntegerv(GL_VERTEX_ARRAY_BINDING, &last_vertex_array); + + const GLchar *vertex_shader = + "#version 330\n" + "uniform mat4 ProjMtx;\n" + "in vec2 Position;\n" + "in vec2 UV;\n" + "in vec4 Color;\n" + "out vec2 Frag_UV;\n" + "out vec4 Frag_Color;\n" + "void main()\n" + "{\n" + " Frag_UV = UV;\n" + " Frag_Color = Color;\n" + " gl_Position = ProjMtx * vec4(Position.xy,0,1);\n" + "}\n"; + + const GLchar* fragment_shader = + "#version 330\n" + "uniform sampler2D Texture;\n" + "in vec2 Frag_UV;\n" + "in vec4 Frag_Color;\n" + "out vec4 Out_Color;\n" + "void main()\n" + "{\n" + " Out_Color = Frag_Color * texture( Texture, Frag_UV.st);\n" + "}\n"; + + g_ShaderHandle = glCreateProgram(); + g_VertHandle = glCreateShader(GL_VERTEX_SHADER); + g_FragHandle = glCreateShader(GL_FRAGMENT_SHADER); + glShaderSource(g_VertHandle, 1, &vertex_shader, 0); + glShaderSource(g_FragHandle, 1, &fragment_shader, 0); + glCompileShader(g_VertHandle); + glCompileShader(g_FragHandle); + glAttachShader(g_ShaderHandle, g_VertHandle); + glAttachShader(g_ShaderHandle, g_FragHandle); + glLinkProgram(g_ShaderHandle); + + g_AttribLocationTex = glGetUniformLocation(g_ShaderHandle, "Texture"); + g_AttribLocationProjMtx = glGetUniformLocation(g_ShaderHandle, "ProjMtx"); + g_AttribLocationPosition = glGetAttribLocation(g_ShaderHandle, "Position"); + g_AttribLocationUV = glGetAttribLocation(g_ShaderHandle, "UV"); + g_AttribLocationColor = glGetAttribLocation(g_ShaderHandle, "Color"); + + glGenBuffers(1, &g_VboHandle); + glGenBuffers(1, &g_ElementsHandle); + + glGenVertexArrays(1, &g_VaoHandle); + glBindVertexArray(g_VaoHandle); + glBindBuffer(GL_ARRAY_BUFFER, g_VboHandle); + glEnableVertexAttribArray(g_AttribLocationPosition); + glEnableVertexAttribArray(g_AttribLocationUV); + glEnableVertexAttribArray(g_AttribLocationColor); + +#define OFFSETOF(TYPE, ELEMENT) ((size_t)&(((TYPE *)0)->ELEMENT)) + glVertexAttribPointer(g_AttribLocationPosition, 2, GL_FLOAT, GL_FALSE, sizeof(ImDrawVert), (GLvoid*)OFFSETOF(ImDrawVert, pos)); + glVertexAttribPointer(g_AttribLocationUV, 2, GL_FLOAT, GL_FALSE, sizeof(ImDrawVert), (GLvoid*)OFFSETOF(ImDrawVert, uv)); + glVertexAttribPointer(g_AttribLocationColor, 4, GL_UNSIGNED_BYTE, GL_TRUE, sizeof(ImDrawVert), (GLvoid*)OFFSETOF(ImDrawVert, col)); +#undef OFFSETOF + + ImGui_ImplSdlGL3_CreateFontsTexture(); + + // Restore modified GL state + glBindTexture(GL_TEXTURE_2D, last_texture); + glBindBuffer(GL_ARRAY_BUFFER, last_array_buffer); + glBindVertexArray(last_vertex_array); + + return true; +} + +void ImGui_ImplSdlGL3_InvalidateDeviceObjects() +{ + if (g_FontTexture) + { + glDeleteTextures(1, &g_FontTexture); + ImGui::GetIO().Fonts->TexID = 0; + g_FontTexture = 0; + } +} + +bool ImGui_ImplSdlGL3_Init(SDL_Window *window) +{ + g_Window = window; + + ImGuiIO& io = ImGui::GetIO(); + io.KeyMap[ImGuiKey_Tab] = SDLK_TAB; // Keyboard mapping. ImGui will use those indices to peek into the io.KeyDown[] array. + io.KeyMap[ImGuiKey_LeftArrow] = SDL_SCANCODE_LEFT; + io.KeyMap[ImGuiKey_RightArrow] = SDL_SCANCODE_RIGHT; + io.KeyMap[ImGuiKey_UpArrow] = SDL_SCANCODE_UP; + io.KeyMap[ImGuiKey_DownArrow] = SDL_SCANCODE_DOWN; + io.KeyMap[ImGuiKey_PageUp] = SDL_SCANCODE_PAGEUP; + io.KeyMap[ImGuiKey_PageDown] = SDL_SCANCODE_PAGEDOWN; + io.KeyMap[ImGuiKey_Home] = SDL_SCANCODE_HOME; + io.KeyMap[ImGuiKey_End] = SDL_SCANCODE_END; + io.KeyMap[ImGuiKey_Delete] = SDLK_DELETE; + io.KeyMap[ImGuiKey_Backspace] = SDLK_BACKSPACE; + io.KeyMap[ImGuiKey_Enter] = SDLK_RETURN; + io.KeyMap[ImGuiKey_Escape] = SDLK_ESCAPE; + io.KeyMap[ImGuiKey_A] = SDLK_a; + io.KeyMap[ImGuiKey_C] = SDLK_c; + io.KeyMap[ImGuiKey_V] = SDLK_v; + io.KeyMap[ImGuiKey_X] = SDLK_x; + io.KeyMap[ImGuiKey_Y] = SDLK_y; + io.KeyMap[ImGuiKey_Z] = SDLK_z; + + io.RenderDrawListsFn = ImGui_ImplSdlGL3_RenderDrawLists; // Alternatively you can set this to NULL and call ImGui::GetDrawData() after ImGui::Render() to get the same ImDrawData pointer. + io.SetClipboardTextFn = ImGui_ImplSdlGL3_SetClipboardText; + io.GetClipboardTextFn = ImGui_ImplSdlGL3_GetClipboardText; + +#ifdef _WIN32 + SDL_SysWMinfo wmInfo; + SDL_VERSION(&wmInfo.version); + SDL_GetWindowWMInfo(window, &wmInfo); + io.ImeWindowHandle = wmInfo.info.win.window; +#endif + + return true; +} + +void ImGui_ImplSdlGL3_Shutdown() +{ + if (g_VaoHandle) glDeleteVertexArrays(1, &g_VaoHandle); + if (g_VboHandle) glDeleteBuffers(1, &g_VboHandle); + if (g_ElementsHandle) glDeleteBuffers(1, &g_ElementsHandle); + g_VaoHandle = g_VboHandle = g_ElementsHandle = 0; + + glDetachShader(g_ShaderHandle, g_VertHandle); + glDeleteShader(g_VertHandle); + g_VertHandle = 0; + + glDetachShader(g_ShaderHandle, g_FragHandle); + glDeleteShader(g_FragHandle); + g_FragHandle = 0; + + glDeleteProgram(g_ShaderHandle); + g_ShaderHandle = 0; + + if (g_FontTexture) + { + glDeleteTextures(1, &g_FontTexture); + ImGui::GetIO().Fonts->TexID = 0; + g_FontTexture = 0; + } + ImGui::Shutdown(); +} + +void ImGui_ImplSdlGL3_NewFrame(SDL_Window *window) +{ + if (!g_FontTexture) + ImGui_ImplSdlGL3_CreateDeviceObjects(); + + ImGuiIO& io = ImGui::GetIO(); + + // Setup display size (every frame to accommodate for window resizing) + int w, h; + int display_w, display_h; + SDL_GetWindowSize(window, &w, &h); + SDL_GetWindowSize(window, &display_w, &display_h); + io.DisplaySize = ImVec2((float)w, (float)h); + io.DisplayFramebufferScale = ImVec2((float)display_w / w, (float)display_h / h); + + // Setup time step + Uint32 time = SDL_GetTicks(); + double current_time = time / 1000.0; + io.DeltaTime = g_Time > 0.0 ? (float)(current_time - g_Time) : (float)(1.0f / 60.0f); + g_Time = current_time; + + // Setup inputs + // (we already got mouse wheel, keyboard keys & characters from glfw callbacks polled in glfwPollEvents()) + int mx, my; + Uint32 mouseMask = SDL_GetMouseState(&mx, &my); + if (SDL_GetWindowFlags(window) & SDL_WINDOW_MOUSE_FOCUS) + io.MousePos = ImVec2((float)mx, (float)my); // Mouse position, in pixels (set to -1,-1 if no mouse / on another screen, etc.) + else + io.MousePos = ImVec2(-1, -1); + + io.MouseDown[0] = g_MousePressed[0] || (mouseMask & SDL_BUTTON(SDL_BUTTON_LEFT)) != 0; // If a mouse press event came, always pass it as "mouse held this frame", so we don't miss click-release events that are shorter than 1 frame. + io.MouseDown[1] = g_MousePressed[1] || (mouseMask & SDL_BUTTON(SDL_BUTTON_RIGHT)) != 0; + io.MouseDown[2] = g_MousePressed[2] || (mouseMask & SDL_BUTTON(SDL_BUTTON_MIDDLE)) != 0; + g_MousePressed[0] = g_MousePressed[1] = g_MousePressed[2] = false; + + io.MouseWheel = g_MouseWheel; + g_MouseWheel = 0.0f; + + // Hide OS mouse cursor if ImGui is drawing it + SDL_ShowCursor(io.MouseDrawCursor ? 0 : 1); + + // Start the frame + ImGui::NewFrame(); +} \ No newline at end of file diff --git a/examples/sdl_opengl3_example/imgui_impl_sdl_gl3.h b/examples/sdl_opengl3_example/imgui_impl_sdl_gl3.h new file mode 100644 index 0000000..e324b3d --- /dev/null +++ b/examples/sdl_opengl3_example/imgui_impl_sdl_gl3.h @@ -0,0 +1,14 @@ +// ImGui SDL2 binding with OpenGL3 +// https://github.com/ocornut/imgui + +struct SDL_Window; +typedef union SDL_Event SDL_Event; + +IMGUI_API bool ImGui_ImplSdlGL3_Init(SDL_Window *window); +IMGUI_API void ImGui_ImplSdlGL3_Shutdown(); +IMGUI_API void ImGui_ImplSdlGL3_NewFrame(SDL_Window *window); +IMGUI_API bool ImGui_ImplSdlGL3_ProcessEvent(SDL_Event* event); + +// Use if you want to reset your rendering device without losing ImGui state. +IMGUI_API void ImGui_ImplSdlGL3_InvalidateDeviceObjects(); +IMGUI_API bool ImGui_ImplSdlGL3_CreateDeviceObjects(); diff --git a/examples/sdl_opengl3_example/imgui_impl_sdlogl3.cpp b/examples/sdl_opengl3_example/imgui_impl_sdlogl3.cpp deleted file mode 100644 index 16a773f..0000000 --- a/examples/sdl_opengl3_example/imgui_impl_sdlogl3.cpp +++ /dev/null @@ -1,379 +0,0 @@ -// ImGui SDL2 binding with OpenGL3 -// https://github.com/ocornut/imgui - -#include -#include -#include -#include "imgui.h" -#include "imgui_impl_sdlogl3.h" - -// Data -static SDL_Window* g_Window = NULL; -static double g_Time = 0.0f; -static bool g_MousePressed[3] = { false, false, false }; -static float g_MouseWheel = 0.0f; -static GLuint g_FontTexture = 0; -static int g_ShaderHandle = 0, g_VertHandle = 0, g_FragHandle = 0; -static int g_AttribLocationTex = 0, g_AttribLocationProjMtx = 0; -static int g_AttribLocationPosition = 0, g_AttribLocationUV = 0, g_AttribLocationColor = 0; -static unsigned int g_VboHandle = 0, g_VaoHandle = 0, g_ElementsHandle = 0; - -// This is the main rendering function that you have to implement and provide to ImGui (via setting up 'RenderDrawListsFn' in the ImGuiIO structure) -// If text or lines are blurry when integrating ImGui in your engine: -// - in your Render function, try translating your projection matrix by (0.5f,0.5f) or (0.375f,0.375f) -void ImGui_ImplSdlOgl3_RenderDrawLists(ImDrawData* draw_data) -{ - // Backup GL state - GLint last_program; glGetIntegerv(GL_CURRENT_PROGRAM, &last_program); - GLint last_texture; glGetIntegerv(GL_TEXTURE_BINDING_2D, &last_texture); - GLint last_array_buffer; glGetIntegerv(GL_ARRAY_BUFFER_BINDING, &last_array_buffer); - GLint last_element_array_buffer; glGetIntegerv(GL_ELEMENT_ARRAY_BUFFER_BINDING, &last_element_array_buffer); - GLint last_vertex_array; glGetIntegerv(GL_VERTEX_ARRAY_BINDING, &last_vertex_array); - GLint last_blend_src; glGetIntegerv(GL_BLEND_SRC, &last_blend_src); - GLint last_blend_dst; glGetIntegerv(GL_BLEND_DST, &last_blend_dst); - GLint last_blend_equation_rgb; glGetIntegerv(GL_BLEND_EQUATION_RGB, &last_blend_equation_rgb); - GLint last_blend_equation_alpha; glGetIntegerv(GL_BLEND_EQUATION_ALPHA, &last_blend_equation_alpha); - GLboolean last_enable_blend = glIsEnabled(GL_BLEND); - GLboolean last_enable_cull_face = glIsEnabled(GL_CULL_FACE); - GLboolean last_enable_depth_test = glIsEnabled(GL_DEPTH_TEST); - GLboolean last_enable_scissor_test = glIsEnabled(GL_SCISSOR_TEST); - - // Setup render state: alpha-blending enabled, no face culling, no depth testing, scissor enabled - glEnable(GL_BLEND); - glBlendEquation(GL_FUNC_ADD); - glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA); - glDisable(GL_CULL_FACE); - glDisable(GL_DEPTH_TEST); - glEnable(GL_SCISSOR_TEST); - glActiveTexture(GL_TEXTURE0); - - // Handle cases of screen coordinates != from framebuffer coordinates (e.g. retina displays) - ImGuiIO& io = ImGui::GetIO(); - float fb_height = io.DisplaySize.y * io.DisplayFramebufferScale.y; - draw_data->ScaleClipRects(io.DisplayFramebufferScale); - - // Setup orthographic projection matrix - const float ortho_projection[4][4] = - { - { 2.0f / io.DisplaySize.x, 0.0f, 0.0f, 0.0f }, - { 0.0f, 2.0f / -io.DisplaySize.y, 0.0f, 0.0f }, - { 0.0f, 0.0f, -1.0f, 0.0f }, - { -1.0f, 1.0f, 0.0f, 1.0f }, - }; - glUseProgram(g_ShaderHandle); - glUniform1i(g_AttribLocationTex, 0); - glUniformMatrix4fv(g_AttribLocationProjMtx, 1, GL_FALSE, &ortho_projection[0][0]); - glBindVertexArray(g_VaoHandle); - - for (int n = 0; n < draw_data->CmdListsCount; n++) - { - const ImDrawList* cmd_list = draw_data->CmdLists[n]; - const ImDrawIdx* idx_buffer_offset = 0; - - glBindBuffer(GL_ARRAY_BUFFER, g_VboHandle); - glBufferData(GL_ARRAY_BUFFER, (GLsizeiptr)cmd_list->VtxBuffer.size() * sizeof(ImDrawVert), (GLvoid*)&cmd_list->VtxBuffer.front(), GL_STREAM_DRAW); - - glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, g_ElementsHandle); - glBufferData(GL_ELEMENT_ARRAY_BUFFER, (GLsizeiptr)cmd_list->IdxBuffer.size() * sizeof(ImDrawIdx), (GLvoid*)&cmd_list->IdxBuffer.front(), GL_STREAM_DRAW); - - for (const ImDrawCmd* pcmd = cmd_list->CmdBuffer.begin(); pcmd != cmd_list->CmdBuffer.end(); pcmd++) - { - if (pcmd->UserCallback) - { - pcmd->UserCallback(cmd_list, pcmd); - } - else - { - glBindTexture(GL_TEXTURE_2D, (GLuint)(intptr_t)pcmd->TextureId); - glScissor((int)pcmd->ClipRect.x, (int)(fb_height - pcmd->ClipRect.w), (int)(pcmd->ClipRect.z - pcmd->ClipRect.x), (int)(pcmd->ClipRect.w - pcmd->ClipRect.y)); - glDrawElements(GL_TRIANGLES, (GLsizei)pcmd->ElemCount, GL_UNSIGNED_SHORT, idx_buffer_offset); - } - idx_buffer_offset += pcmd->ElemCount; - } - } - - // Restore modified GL state - glUseProgram(last_program); - glBindTexture(GL_TEXTURE_2D, last_texture); - glBindBuffer(GL_ARRAY_BUFFER, last_array_buffer); - glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, last_element_array_buffer); - glBindVertexArray(last_vertex_array); - glBlendEquationSeparate(last_blend_equation_rgb, last_blend_equation_alpha); - glBlendFunc(last_blend_src, last_blend_dst); - if (last_enable_blend) glEnable(GL_BLEND); else glDisable(GL_BLEND); - if (last_enable_cull_face) glEnable(GL_CULL_FACE); else glDisable(GL_CULL_FACE); - if (last_enable_depth_test) glEnable(GL_DEPTH_TEST); else glDisable(GL_DEPTH_TEST); - if (last_enable_scissor_test) glEnable(GL_SCISSOR_TEST); else glDisable(GL_SCISSOR_TEST); -} - -static const char* ImGui_ImplSdlOgl3_GetClipboardText() -{ - return SDL_GetClipboardText(); -} - -static void ImGui_ImplSdlOgl3_SetClipboardText(const char* text) -{ - SDL_SetClipboardText(text); -} - -bool ImGui_ImplSdlOgl3_ProcessEvent(SDL_Event* event) -{ - ImGuiIO& io = ImGui::GetIO(); - switch (event->type) - { - case SDL_MOUSEWHEEL: - { - if (event->wheel.y > 0) - g_MouseWheel = 1; - if (event->wheel.y < 0) - g_MouseWheel = -1; - return true; - } - case SDL_MOUSEBUTTONDOWN: - { - if (event->button.button == SDL_BUTTON_LEFT) g_MousePressed[0] = true; - if (event->button.button == SDL_BUTTON_RIGHT) g_MousePressed[1] = true; - if (event->button.button == SDL_BUTTON_MIDDLE) g_MousePressed[2] = true; - return true; - } - case SDL_TEXTINPUT: - { - ImGuiIO& io = ImGui::GetIO(); - io.AddInputCharactersUTF8(event->text.text); - return true; - } - case SDL_KEYDOWN: - case SDL_KEYUP: - { - int key = event->key.keysym.sym & ~SDLK_SCANCODE_MASK; - io.KeysDown[key] = (event->type == SDL_KEYDOWN); - io.KeyShift = ((SDL_GetModState() & KMOD_SHIFT) != 0); - io.KeyCtrl = ((SDL_GetModState() & KMOD_CTRL) != 0); - io.KeyAlt = ((SDL_GetModState() & KMOD_ALT) != 0); - return true; - } - } - return false; -} - -void ImGui_ImplSdlOgl3_CreateFontsTexture() -{ - ImGuiIO& io = ImGui::GetIO(); - - // Build texture atlas - unsigned char* pixels; - int width, height; - io.Fonts->GetTexDataAsRGBA32(&pixels, &width, &height); // Load as RGBA 32-bits for OpenGL3 demo because it is more likely to be compatible with user's existing shader. - - // Create OpenGL texture - glGenTextures(1, &g_FontTexture); - glBindTexture(GL_TEXTURE_2D, g_FontTexture); - glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); - glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); - glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, pixels); - - // Store our identifier - io.Fonts->TexID = (void *)(intptr_t)g_FontTexture; - - // Cleanup (don't clear the input data if you want to append new fonts later) - io.Fonts->ClearInputData(); - io.Fonts->ClearTexData(); -} - -bool ImGui_ImplSdlOgl3_CreateDeviceObjects() -{ - // Backup GL state - GLint last_texture, last_array_buffer, last_vertex_array; - glGetIntegerv(GL_TEXTURE_BINDING_2D, &last_texture); - glGetIntegerv(GL_ARRAY_BUFFER_BINDING, &last_array_buffer); - glGetIntegerv(GL_VERTEX_ARRAY_BINDING, &last_vertex_array); - - const GLchar *vertex_shader = - "#version 330\n" - "uniform mat4 ProjMtx;\n" - "in vec2 Position;\n" - "in vec2 UV;\n" - "in vec4 Color;\n" - "out vec2 Frag_UV;\n" - "out vec4 Frag_Color;\n" - "void main()\n" - "{\n" - " Frag_UV = UV;\n" - " Frag_Color = Color;\n" - " gl_Position = ProjMtx * vec4(Position.xy,0,1);\n" - "}\n"; - - const GLchar* fragment_shader = - "#version 330\n" - "uniform sampler2D Texture;\n" - "in vec2 Frag_UV;\n" - "in vec4 Frag_Color;\n" - "out vec4 Out_Color;\n" - "void main()\n" - "{\n" - " Out_Color = Frag_Color * texture( Texture, Frag_UV.st);\n" - "}\n"; - - g_ShaderHandle = glCreateProgram(); - g_VertHandle = glCreateShader(GL_VERTEX_SHADER); - g_FragHandle = glCreateShader(GL_FRAGMENT_SHADER); - glShaderSource(g_VertHandle, 1, &vertex_shader, 0); - glShaderSource(g_FragHandle, 1, &fragment_shader, 0); - glCompileShader(g_VertHandle); - glCompileShader(g_FragHandle); - glAttachShader(g_ShaderHandle, g_VertHandle); - glAttachShader(g_ShaderHandle, g_FragHandle); - glLinkProgram(g_ShaderHandle); - - g_AttribLocationTex = glGetUniformLocation(g_ShaderHandle, "Texture"); - g_AttribLocationProjMtx = glGetUniformLocation(g_ShaderHandle, "ProjMtx"); - g_AttribLocationPosition = glGetAttribLocation(g_ShaderHandle, "Position"); - g_AttribLocationUV = glGetAttribLocation(g_ShaderHandle, "UV"); - g_AttribLocationColor = glGetAttribLocation(g_ShaderHandle, "Color"); - - glGenBuffers(1, &g_VboHandle); - glGenBuffers(1, &g_ElementsHandle); - - glGenVertexArrays(1, &g_VaoHandle); - glBindVertexArray(g_VaoHandle); - glBindBuffer(GL_ARRAY_BUFFER, g_VboHandle); - glEnableVertexAttribArray(g_AttribLocationPosition); - glEnableVertexAttribArray(g_AttribLocationUV); - glEnableVertexAttribArray(g_AttribLocationColor); - -#define OFFSETOF(TYPE, ELEMENT) ((size_t)&(((TYPE *)0)->ELEMENT)) - glVertexAttribPointer(g_AttribLocationPosition, 2, GL_FLOAT, GL_FALSE, sizeof(ImDrawVert), (GLvoid*)OFFSETOF(ImDrawVert, pos)); - glVertexAttribPointer(g_AttribLocationUV, 2, GL_FLOAT, GL_FALSE, sizeof(ImDrawVert), (GLvoid*)OFFSETOF(ImDrawVert, uv)); - glVertexAttribPointer(g_AttribLocationColor, 4, GL_UNSIGNED_BYTE, GL_TRUE, sizeof(ImDrawVert), (GLvoid*)OFFSETOF(ImDrawVert, col)); -#undef OFFSETOF - - ImGui_ImplSdlOgl3_CreateFontsTexture(); - - // Restore modified GL state - glBindTexture(GL_TEXTURE_2D, last_texture); - glBindBuffer(GL_ARRAY_BUFFER, last_array_buffer); - glBindVertexArray(last_vertex_array); - - return true; -} - -void ImGui_ImplSdlOgl3_InvalidateDeviceObjects() -{ - if (g_FontTexture) - { - glDeleteTextures(1, &g_FontTexture); - ImGui::GetIO().Fonts->TexID = 0; - g_FontTexture = 0; - } -} - -bool ImGui_ImplSdlOgl3_Init(SDL_Window *window) -{ - g_Window = window; - - ImGuiIO& io = ImGui::GetIO(); - io.KeyMap[ImGuiKey_Tab] = SDLK_TAB; // Keyboard mapping. ImGui will use those indices to peek into the io.KeyDown[] array. - io.KeyMap[ImGuiKey_LeftArrow] = SDL_SCANCODE_LEFT; - io.KeyMap[ImGuiKey_RightArrow] = SDL_SCANCODE_RIGHT; - io.KeyMap[ImGuiKey_UpArrow] = SDL_SCANCODE_UP; - io.KeyMap[ImGuiKey_DownArrow] = SDL_SCANCODE_DOWN; - io.KeyMap[ImGuiKey_PageUp] = SDL_SCANCODE_PAGEUP; - io.KeyMap[ImGuiKey_PageDown] = SDL_SCANCODE_PAGEDOWN; - io.KeyMap[ImGuiKey_Home] = SDL_SCANCODE_HOME; - io.KeyMap[ImGuiKey_End] = SDL_SCANCODE_END; - io.KeyMap[ImGuiKey_Delete] = SDLK_DELETE; - io.KeyMap[ImGuiKey_Backspace] = SDLK_BACKSPACE; - io.KeyMap[ImGuiKey_Enter] = SDLK_RETURN; - io.KeyMap[ImGuiKey_Escape] = SDLK_ESCAPE; - io.KeyMap[ImGuiKey_A] = SDLK_a; - io.KeyMap[ImGuiKey_C] = SDLK_c; - io.KeyMap[ImGuiKey_V] = SDLK_v; - io.KeyMap[ImGuiKey_X] = SDLK_x; - io.KeyMap[ImGuiKey_Y] = SDLK_y; - io.KeyMap[ImGuiKey_Z] = SDLK_z; - - io.RenderDrawListsFn = ImGui_ImplSdlOgl3_RenderDrawLists; // Alternatively you can set this to NULL and call ImGui::GetDrawData() after ImGui::Render() to get the same ImDrawData pointer. - io.SetClipboardTextFn = ImGui_ImplSdlOgl3_SetClipboardText; - io.GetClipboardTextFn = ImGui_ImplSdlOgl3_GetClipboardText; - -#ifdef _WIN32 - SDL_SysWMinfo wmInfo; - SDL_VERSION(&wmInfo.version); - SDL_GetWindowWMInfo(window, &wmInfo); - io.ImeWindowHandle = wmInfo.info.win.window; -#endif - - return true; -} - -void ImGui_ImplSdlOgl3_Shutdown() -{ - if (g_VaoHandle) glDeleteVertexArrays(1, &g_VaoHandle); - if (g_VboHandle) glDeleteBuffers(1, &g_VboHandle); - if (g_ElementsHandle) glDeleteBuffers(1, &g_ElementsHandle); - g_VaoHandle = g_VboHandle = g_ElementsHandle = 0; - - glDetachShader(g_ShaderHandle, g_VertHandle); - glDeleteShader(g_VertHandle); - g_VertHandle = 0; - - glDetachShader(g_ShaderHandle, g_FragHandle); - glDeleteShader(g_FragHandle); - g_FragHandle = 0; - - glDeleteProgram(g_ShaderHandle); - g_ShaderHandle = 0; - - if (g_FontTexture) - { - glDeleteTextures(1, &g_FontTexture); - ImGui::GetIO().Fonts->TexID = 0; - g_FontTexture = 0; - } - ImGui::Shutdown(); -} - -void ImGui_ImplSdlOgl3_NewFrame(SDL_Window *window) -{ - if (!g_FontTexture) - ImGui_ImplSdlOgl3_CreateDeviceObjects(); - - ImGuiIO& io = ImGui::GetIO(); - - // Setup display size (every frame to accommodate for window resizing) - int w, h; - int display_w, display_h; - SDL_GetWindowSize(window, &w, &h); - SDL_GetWindowSize(window, &display_w, &display_h); - io.DisplaySize = ImVec2((float)w, (float)h); - io.DisplayFramebufferScale = ImVec2((float)display_w / w, (float)display_h / h); - - // Setup time step - Uint32 time = SDL_GetTicks(); - double current_time = time / 1000.0; - io.DeltaTime = g_Time > 0.0 ? (float)(current_time - g_Time) : (float)(1.0f / 60.0f); - g_Time = current_time; - - // Setup inputs - // (we already got mouse wheel, keyboard keys & characters from glfw callbacks polled in glfwPollEvents()) - int mx, my; - Uint32 mouseMask = SDL_GetMouseState(&mx, &my); - if (SDL_GetWindowFlags(window) & SDL_WINDOW_MOUSE_FOCUS) - io.MousePos = ImVec2((float)mx, (float)my); // Mouse position, in pixels (set to -1,-1 if no mouse / on another screen, etc.) - else - io.MousePos = ImVec2(-1, -1); - - io.MouseDown[0] = g_MousePressed[0] || (mouseMask & SDL_BUTTON(SDL_BUTTON_LEFT)) != 0; // If a mouse press event came, always pass it as "mouse held this frame", so we don't miss click-release events that are shorter than 1 frame. - io.MouseDown[1] = g_MousePressed[1] || (mouseMask & SDL_BUTTON(SDL_BUTTON_RIGHT)) != 0; - io.MouseDown[2] = g_MousePressed[2] || (mouseMask & SDL_BUTTON(SDL_BUTTON_MIDDLE)) != 0; - g_MousePressed[0] = g_MousePressed[1] = g_MousePressed[2] = false; - - io.MouseWheel = g_MouseWheel; - g_MouseWheel = 0.0f; - - // Hide OS mouse cursor if ImGui is drawing it - SDL_ShowCursor(io.MouseDrawCursor ? 0 : 1); - - // Start the frame - ImGui::NewFrame(); -} \ No newline at end of file diff --git a/examples/sdl_opengl3_example/README.md b/examples/sdl_opengl3_example/README.md index f0b83b2..a0d94cf 100644 --- a/examples/sdl_opengl3_example/README.md +++ b/examples/sdl_opengl3_example/README.md @@ -1,8 +1,22 @@ # How to Build -Link -=== -OpenGL -SDL2 -GLEW \ No newline at end of file +- On Windows with Visual Studio's CLI + +``` +set SDL2DIR=path_to_your_sdl2_folder +cl /Zi /MD /I ..\.. /I ..\libs\gl3w /I %SDL2DIR%\include main.cpp imgui_impl_sdl_gl3.cpp ..\..\imgui*.cpp ..\libs\gl3w\GL\gl3w.c /link /libpath:%SDL2DIR%\lib\x86 SDL2.lib SDL2main.lib opengl32.lib /subsystem:console +``` + +- On Linux and similar Unixes + +``` +c++ `sdl2-config --cflags` -I ../.. -I ../libs/gl3w main.cpp imgui_impl_sdl.cpp ../../imgui*.cpp ../libs/gl3w/GL/gl3w.c `sdl2-config --libs` -lGL -o sdl2example +``` + +- On Mac OS X + +``` +brew install sdl2 +c++ `sdl2-config --cflags` -I ../.. -I ../libs/gl3w main.cpp imgui_impl_sdl.cpp ../../imgui*.cpp ../libs/gl3w/GL/gl3w.c `sdl2-config --libs` -framework OpenGl -o sdl2example +``` diff --git a/examples/sdl_opengl3_example/imgui_impl_sdl_gl3.cpp b/examples/sdl_opengl3_example/imgui_impl_sdl_gl3.cpp new file mode 100644 index 0000000..fdf3ff5 --- /dev/null +++ b/examples/sdl_opengl3_example/imgui_impl_sdl_gl3.cpp @@ -0,0 +1,379 @@ +// ImGui SDL2 binding with OpenGL3 +// https://github.com/ocornut/imgui + +#include +#include +#include +#include "imgui.h" +#include "imgui_impl_sdl_gl3.h" + +// Data +static SDL_Window* g_Window = NULL; +static double g_Time = 0.0f; +static bool g_MousePressed[3] = { false, false, false }; +static float g_MouseWheel = 0.0f; +static GLuint g_FontTexture = 0; +static int g_ShaderHandle = 0, g_VertHandle = 0, g_FragHandle = 0; +static int g_AttribLocationTex = 0, g_AttribLocationProjMtx = 0; +static int g_AttribLocationPosition = 0, g_AttribLocationUV = 0, g_AttribLocationColor = 0; +static unsigned int g_VboHandle = 0, g_VaoHandle = 0, g_ElementsHandle = 0; + +// This is the main rendering function that you have to implement and provide to ImGui (via setting up 'RenderDrawListsFn' in the ImGuiIO structure) +// If text or lines are blurry when integrating ImGui in your engine: +// - in your Render function, try translating your projection matrix by (0.5f,0.5f) or (0.375f,0.375f) +void ImGui_ImplSdlGL3_RenderDrawLists(ImDrawData* draw_data) +{ + // Backup GL state + GLint last_program; glGetIntegerv(GL_CURRENT_PROGRAM, &last_program); + GLint last_texture; glGetIntegerv(GL_TEXTURE_BINDING_2D, &last_texture); + GLint last_array_buffer; glGetIntegerv(GL_ARRAY_BUFFER_BINDING, &last_array_buffer); + GLint last_element_array_buffer; glGetIntegerv(GL_ELEMENT_ARRAY_BUFFER_BINDING, &last_element_array_buffer); + GLint last_vertex_array; glGetIntegerv(GL_VERTEX_ARRAY_BINDING, &last_vertex_array); + GLint last_blend_src; glGetIntegerv(GL_BLEND_SRC, &last_blend_src); + GLint last_blend_dst; glGetIntegerv(GL_BLEND_DST, &last_blend_dst); + GLint last_blend_equation_rgb; glGetIntegerv(GL_BLEND_EQUATION_RGB, &last_blend_equation_rgb); + GLint last_blend_equation_alpha; glGetIntegerv(GL_BLEND_EQUATION_ALPHA, &last_blend_equation_alpha); + GLboolean last_enable_blend = glIsEnabled(GL_BLEND); + GLboolean last_enable_cull_face = glIsEnabled(GL_CULL_FACE); + GLboolean last_enable_depth_test = glIsEnabled(GL_DEPTH_TEST); + GLboolean last_enable_scissor_test = glIsEnabled(GL_SCISSOR_TEST); + + // Setup render state: alpha-blending enabled, no face culling, no depth testing, scissor enabled + glEnable(GL_BLEND); + glBlendEquation(GL_FUNC_ADD); + glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA); + glDisable(GL_CULL_FACE); + glDisable(GL_DEPTH_TEST); + glEnable(GL_SCISSOR_TEST); + glActiveTexture(GL_TEXTURE0); + + // Handle cases of screen coordinates != from framebuffer coordinates (e.g. retina displays) + ImGuiIO& io = ImGui::GetIO(); + float fb_height = io.DisplaySize.y * io.DisplayFramebufferScale.y; + draw_data->ScaleClipRects(io.DisplayFramebufferScale); + + // Setup orthographic projection matrix + const float ortho_projection[4][4] = + { + { 2.0f / io.DisplaySize.x, 0.0f, 0.0f, 0.0f }, + { 0.0f, 2.0f / -io.DisplaySize.y, 0.0f, 0.0f }, + { 0.0f, 0.0f, -1.0f, 0.0f }, + { -1.0f, 1.0f, 0.0f, 1.0f }, + }; + glUseProgram(g_ShaderHandle); + glUniform1i(g_AttribLocationTex, 0); + glUniformMatrix4fv(g_AttribLocationProjMtx, 1, GL_FALSE, &ortho_projection[0][0]); + glBindVertexArray(g_VaoHandle); + + for (int n = 0; n < draw_data->CmdListsCount; n++) + { + const ImDrawList* cmd_list = draw_data->CmdLists[n]; + const ImDrawIdx* idx_buffer_offset = 0; + + glBindBuffer(GL_ARRAY_BUFFER, g_VboHandle); + glBufferData(GL_ARRAY_BUFFER, (GLsizeiptr)cmd_list->VtxBuffer.size() * sizeof(ImDrawVert), (GLvoid*)&cmd_list->VtxBuffer.front(), GL_STREAM_DRAW); + + glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, g_ElementsHandle); + glBufferData(GL_ELEMENT_ARRAY_BUFFER, (GLsizeiptr)cmd_list->IdxBuffer.size() * sizeof(ImDrawIdx), (GLvoid*)&cmd_list->IdxBuffer.front(), GL_STREAM_DRAW); + + for (const ImDrawCmd* pcmd = cmd_list->CmdBuffer.begin(); pcmd != cmd_list->CmdBuffer.end(); pcmd++) + { + if (pcmd->UserCallback) + { + pcmd->UserCallback(cmd_list, pcmd); + } + else + { + glBindTexture(GL_TEXTURE_2D, (GLuint)(intptr_t)pcmd->TextureId); + glScissor((int)pcmd->ClipRect.x, (int)(fb_height - pcmd->ClipRect.w), (int)(pcmd->ClipRect.z - pcmd->ClipRect.x), (int)(pcmd->ClipRect.w - pcmd->ClipRect.y)); + glDrawElements(GL_TRIANGLES, (GLsizei)pcmd->ElemCount, GL_UNSIGNED_SHORT, idx_buffer_offset); + } + idx_buffer_offset += pcmd->ElemCount; + } + } + + // Restore modified GL state + glUseProgram(last_program); + glBindTexture(GL_TEXTURE_2D, last_texture); + glBindBuffer(GL_ARRAY_BUFFER, last_array_buffer); + glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, last_element_array_buffer); + glBindVertexArray(last_vertex_array); + glBlendEquationSeparate(last_blend_equation_rgb, last_blend_equation_alpha); + glBlendFunc(last_blend_src, last_blend_dst); + if (last_enable_blend) glEnable(GL_BLEND); else glDisable(GL_BLEND); + if (last_enable_cull_face) glEnable(GL_CULL_FACE); else glDisable(GL_CULL_FACE); + if (last_enable_depth_test) glEnable(GL_DEPTH_TEST); else glDisable(GL_DEPTH_TEST); + if (last_enable_scissor_test) glEnable(GL_SCISSOR_TEST); else glDisable(GL_SCISSOR_TEST); +} + +static const char* ImGui_ImplSdlGL3_GetClipboardText() +{ + return SDL_GetClipboardText(); +} + +static void ImGui_ImplSdlGL3_SetClipboardText(const char* text) +{ + SDL_SetClipboardText(text); +} + +bool ImGui_ImplSdlGL3_ProcessEvent(SDL_Event* event) +{ + ImGuiIO& io = ImGui::GetIO(); + switch (event->type) + { + case SDL_MOUSEWHEEL: + { + if (event->wheel.y > 0) + g_MouseWheel = 1; + if (event->wheel.y < 0) + g_MouseWheel = -1; + return true; + } + case SDL_MOUSEBUTTONDOWN: + { + if (event->button.button == SDL_BUTTON_LEFT) g_MousePressed[0] = true; + if (event->button.button == SDL_BUTTON_RIGHT) g_MousePressed[1] = true; + if (event->button.button == SDL_BUTTON_MIDDLE) g_MousePressed[2] = true; + return true; + } + case SDL_TEXTINPUT: + { + ImGuiIO& io = ImGui::GetIO(); + io.AddInputCharactersUTF8(event->text.text); + return true; + } + case SDL_KEYDOWN: + case SDL_KEYUP: + { + int key = event->key.keysym.sym & ~SDLK_SCANCODE_MASK; + io.KeysDown[key] = (event->type == SDL_KEYDOWN); + io.KeyShift = ((SDL_GetModState() & KMOD_SHIFT) != 0); + io.KeyCtrl = ((SDL_GetModState() & KMOD_CTRL) != 0); + io.KeyAlt = ((SDL_GetModState() & KMOD_ALT) != 0); + return true; + } + } + return false; +} + +void ImGui_ImplSdlGL3_CreateFontsTexture() +{ + ImGuiIO& io = ImGui::GetIO(); + + // Build texture atlas + unsigned char* pixels; + int width, height; + io.Fonts->GetTexDataAsRGBA32(&pixels, &width, &height); // Load as RGBA 32-bits for OpenGL3 demo because it is more likely to be compatible with user's existing shader. + + // Create OpenGL texture + glGenTextures(1, &g_FontTexture); + glBindTexture(GL_TEXTURE_2D, g_FontTexture); + glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); + glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); + glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, pixels); + + // Store our identifier + io.Fonts->TexID = (void *)(intptr_t)g_FontTexture; + + // Cleanup (don't clear the input data if you want to append new fonts later) + io.Fonts->ClearInputData(); + io.Fonts->ClearTexData(); +} + +bool ImGui_ImplSdlGL3_CreateDeviceObjects() +{ + // Backup GL state + GLint last_texture, last_array_buffer, last_vertex_array; + glGetIntegerv(GL_TEXTURE_BINDING_2D, &last_texture); + glGetIntegerv(GL_ARRAY_BUFFER_BINDING, &last_array_buffer); + glGetIntegerv(GL_VERTEX_ARRAY_BINDING, &last_vertex_array); + + const GLchar *vertex_shader = + "#version 330\n" + "uniform mat4 ProjMtx;\n" + "in vec2 Position;\n" + "in vec2 UV;\n" + "in vec4 Color;\n" + "out vec2 Frag_UV;\n" + "out vec4 Frag_Color;\n" + "void main()\n" + "{\n" + " Frag_UV = UV;\n" + " Frag_Color = Color;\n" + " gl_Position = ProjMtx * vec4(Position.xy,0,1);\n" + "}\n"; + + const GLchar* fragment_shader = + "#version 330\n" + "uniform sampler2D Texture;\n" + "in vec2 Frag_UV;\n" + "in vec4 Frag_Color;\n" + "out vec4 Out_Color;\n" + "void main()\n" + "{\n" + " Out_Color = Frag_Color * texture( Texture, Frag_UV.st);\n" + "}\n"; + + g_ShaderHandle = glCreateProgram(); + g_VertHandle = glCreateShader(GL_VERTEX_SHADER); + g_FragHandle = glCreateShader(GL_FRAGMENT_SHADER); + glShaderSource(g_VertHandle, 1, &vertex_shader, 0); + glShaderSource(g_FragHandle, 1, &fragment_shader, 0); + glCompileShader(g_VertHandle); + glCompileShader(g_FragHandle); + glAttachShader(g_ShaderHandle, g_VertHandle); + glAttachShader(g_ShaderHandle, g_FragHandle); + glLinkProgram(g_ShaderHandle); + + g_AttribLocationTex = glGetUniformLocation(g_ShaderHandle, "Texture"); + g_AttribLocationProjMtx = glGetUniformLocation(g_ShaderHandle, "ProjMtx"); + g_AttribLocationPosition = glGetAttribLocation(g_ShaderHandle, "Position"); + g_AttribLocationUV = glGetAttribLocation(g_ShaderHandle, "UV"); + g_AttribLocationColor = glGetAttribLocation(g_ShaderHandle, "Color"); + + glGenBuffers(1, &g_VboHandle); + glGenBuffers(1, &g_ElementsHandle); + + glGenVertexArrays(1, &g_VaoHandle); + glBindVertexArray(g_VaoHandle); + glBindBuffer(GL_ARRAY_BUFFER, g_VboHandle); + glEnableVertexAttribArray(g_AttribLocationPosition); + glEnableVertexAttribArray(g_AttribLocationUV); + glEnableVertexAttribArray(g_AttribLocationColor); + +#define OFFSETOF(TYPE, ELEMENT) ((size_t)&(((TYPE *)0)->ELEMENT)) + glVertexAttribPointer(g_AttribLocationPosition, 2, GL_FLOAT, GL_FALSE, sizeof(ImDrawVert), (GLvoid*)OFFSETOF(ImDrawVert, pos)); + glVertexAttribPointer(g_AttribLocationUV, 2, GL_FLOAT, GL_FALSE, sizeof(ImDrawVert), (GLvoid*)OFFSETOF(ImDrawVert, uv)); + glVertexAttribPointer(g_AttribLocationColor, 4, GL_UNSIGNED_BYTE, GL_TRUE, sizeof(ImDrawVert), (GLvoid*)OFFSETOF(ImDrawVert, col)); +#undef OFFSETOF + + ImGui_ImplSdlGL3_CreateFontsTexture(); + + // Restore modified GL state + glBindTexture(GL_TEXTURE_2D, last_texture); + glBindBuffer(GL_ARRAY_BUFFER, last_array_buffer); + glBindVertexArray(last_vertex_array); + + return true; +} + +void ImGui_ImplSdlGL3_InvalidateDeviceObjects() +{ + if (g_FontTexture) + { + glDeleteTextures(1, &g_FontTexture); + ImGui::GetIO().Fonts->TexID = 0; + g_FontTexture = 0; + } +} + +bool ImGui_ImplSdlGL3_Init(SDL_Window *window) +{ + g_Window = window; + + ImGuiIO& io = ImGui::GetIO(); + io.KeyMap[ImGuiKey_Tab] = SDLK_TAB; // Keyboard mapping. ImGui will use those indices to peek into the io.KeyDown[] array. + io.KeyMap[ImGuiKey_LeftArrow] = SDL_SCANCODE_LEFT; + io.KeyMap[ImGuiKey_RightArrow] = SDL_SCANCODE_RIGHT; + io.KeyMap[ImGuiKey_UpArrow] = SDL_SCANCODE_UP; + io.KeyMap[ImGuiKey_DownArrow] = SDL_SCANCODE_DOWN; + io.KeyMap[ImGuiKey_PageUp] = SDL_SCANCODE_PAGEUP; + io.KeyMap[ImGuiKey_PageDown] = SDL_SCANCODE_PAGEDOWN; + io.KeyMap[ImGuiKey_Home] = SDL_SCANCODE_HOME; + io.KeyMap[ImGuiKey_End] = SDL_SCANCODE_END; + io.KeyMap[ImGuiKey_Delete] = SDLK_DELETE; + io.KeyMap[ImGuiKey_Backspace] = SDLK_BACKSPACE; + io.KeyMap[ImGuiKey_Enter] = SDLK_RETURN; + io.KeyMap[ImGuiKey_Escape] = SDLK_ESCAPE; + io.KeyMap[ImGuiKey_A] = SDLK_a; + io.KeyMap[ImGuiKey_C] = SDLK_c; + io.KeyMap[ImGuiKey_V] = SDLK_v; + io.KeyMap[ImGuiKey_X] = SDLK_x; + io.KeyMap[ImGuiKey_Y] = SDLK_y; + io.KeyMap[ImGuiKey_Z] = SDLK_z; + + io.RenderDrawListsFn = ImGui_ImplSdlGL3_RenderDrawLists; // Alternatively you can set this to NULL and call ImGui::GetDrawData() after ImGui::Render() to get the same ImDrawData pointer. + io.SetClipboardTextFn = ImGui_ImplSdlGL3_SetClipboardText; + io.GetClipboardTextFn = ImGui_ImplSdlGL3_GetClipboardText; + +#ifdef _WIN32 + SDL_SysWMinfo wmInfo; + SDL_VERSION(&wmInfo.version); + SDL_GetWindowWMInfo(window, &wmInfo); + io.ImeWindowHandle = wmInfo.info.win.window; +#endif + + return true; +} + +void ImGui_ImplSdlGL3_Shutdown() +{ + if (g_VaoHandle) glDeleteVertexArrays(1, &g_VaoHandle); + if (g_VboHandle) glDeleteBuffers(1, &g_VboHandle); + if (g_ElementsHandle) glDeleteBuffers(1, &g_ElementsHandle); + g_VaoHandle = g_VboHandle = g_ElementsHandle = 0; + + glDetachShader(g_ShaderHandle, g_VertHandle); + glDeleteShader(g_VertHandle); + g_VertHandle = 0; + + glDetachShader(g_ShaderHandle, g_FragHandle); + glDeleteShader(g_FragHandle); + g_FragHandle = 0; + + glDeleteProgram(g_ShaderHandle); + g_ShaderHandle = 0; + + if (g_FontTexture) + { + glDeleteTextures(1, &g_FontTexture); + ImGui::GetIO().Fonts->TexID = 0; + g_FontTexture = 0; + } + ImGui::Shutdown(); +} + +void ImGui_ImplSdlGL3_NewFrame(SDL_Window *window) +{ + if (!g_FontTexture) + ImGui_ImplSdlGL3_CreateDeviceObjects(); + + ImGuiIO& io = ImGui::GetIO(); + + // Setup display size (every frame to accommodate for window resizing) + int w, h; + int display_w, display_h; + SDL_GetWindowSize(window, &w, &h); + SDL_GetWindowSize(window, &display_w, &display_h); + io.DisplaySize = ImVec2((float)w, (float)h); + io.DisplayFramebufferScale = ImVec2((float)display_w / w, (float)display_h / h); + + // Setup time step + Uint32 time = SDL_GetTicks(); + double current_time = time / 1000.0; + io.DeltaTime = g_Time > 0.0 ? (float)(current_time - g_Time) : (float)(1.0f / 60.0f); + g_Time = current_time; + + // Setup inputs + // (we already got mouse wheel, keyboard keys & characters from glfw callbacks polled in glfwPollEvents()) + int mx, my; + Uint32 mouseMask = SDL_GetMouseState(&mx, &my); + if (SDL_GetWindowFlags(window) & SDL_WINDOW_MOUSE_FOCUS) + io.MousePos = ImVec2((float)mx, (float)my); // Mouse position, in pixels (set to -1,-1 if no mouse / on another screen, etc.) + else + io.MousePos = ImVec2(-1, -1); + + io.MouseDown[0] = g_MousePressed[0] || (mouseMask & SDL_BUTTON(SDL_BUTTON_LEFT)) != 0; // If a mouse press event came, always pass it as "mouse held this frame", so we don't miss click-release events that are shorter than 1 frame. + io.MouseDown[1] = g_MousePressed[1] || (mouseMask & SDL_BUTTON(SDL_BUTTON_RIGHT)) != 0; + io.MouseDown[2] = g_MousePressed[2] || (mouseMask & SDL_BUTTON(SDL_BUTTON_MIDDLE)) != 0; + g_MousePressed[0] = g_MousePressed[1] = g_MousePressed[2] = false; + + io.MouseWheel = g_MouseWheel; + g_MouseWheel = 0.0f; + + // Hide OS mouse cursor if ImGui is drawing it + SDL_ShowCursor(io.MouseDrawCursor ? 0 : 1); + + // Start the frame + ImGui::NewFrame(); +} \ No newline at end of file diff --git a/examples/sdl_opengl3_example/imgui_impl_sdl_gl3.h b/examples/sdl_opengl3_example/imgui_impl_sdl_gl3.h new file mode 100644 index 0000000..e324b3d --- /dev/null +++ b/examples/sdl_opengl3_example/imgui_impl_sdl_gl3.h @@ -0,0 +1,14 @@ +// ImGui SDL2 binding with OpenGL3 +// https://github.com/ocornut/imgui + +struct SDL_Window; +typedef union SDL_Event SDL_Event; + +IMGUI_API bool ImGui_ImplSdlGL3_Init(SDL_Window *window); +IMGUI_API void ImGui_ImplSdlGL3_Shutdown(); +IMGUI_API void ImGui_ImplSdlGL3_NewFrame(SDL_Window *window); +IMGUI_API bool ImGui_ImplSdlGL3_ProcessEvent(SDL_Event* event); + +// Use if you want to reset your rendering device without losing ImGui state. +IMGUI_API void ImGui_ImplSdlGL3_InvalidateDeviceObjects(); +IMGUI_API bool ImGui_ImplSdlGL3_CreateDeviceObjects(); diff --git a/examples/sdl_opengl3_example/imgui_impl_sdlogl3.cpp b/examples/sdl_opengl3_example/imgui_impl_sdlogl3.cpp deleted file mode 100644 index 16a773f..0000000 --- a/examples/sdl_opengl3_example/imgui_impl_sdlogl3.cpp +++ /dev/null @@ -1,379 +0,0 @@ -// ImGui SDL2 binding with OpenGL3 -// https://github.com/ocornut/imgui - -#include -#include -#include -#include "imgui.h" -#include "imgui_impl_sdlogl3.h" - -// Data -static SDL_Window* g_Window = NULL; -static double g_Time = 0.0f; -static bool g_MousePressed[3] = { false, false, false }; -static float g_MouseWheel = 0.0f; -static GLuint g_FontTexture = 0; -static int g_ShaderHandle = 0, g_VertHandle = 0, g_FragHandle = 0; -static int g_AttribLocationTex = 0, g_AttribLocationProjMtx = 0; -static int g_AttribLocationPosition = 0, g_AttribLocationUV = 0, g_AttribLocationColor = 0; -static unsigned int g_VboHandle = 0, g_VaoHandle = 0, g_ElementsHandle = 0; - -// This is the main rendering function that you have to implement and provide to ImGui (via setting up 'RenderDrawListsFn' in the ImGuiIO structure) -// If text or lines are blurry when integrating ImGui in your engine: -// - in your Render function, try translating your projection matrix by (0.5f,0.5f) or (0.375f,0.375f) -void ImGui_ImplSdlOgl3_RenderDrawLists(ImDrawData* draw_data) -{ - // Backup GL state - GLint last_program; glGetIntegerv(GL_CURRENT_PROGRAM, &last_program); - GLint last_texture; glGetIntegerv(GL_TEXTURE_BINDING_2D, &last_texture); - GLint last_array_buffer; glGetIntegerv(GL_ARRAY_BUFFER_BINDING, &last_array_buffer); - GLint last_element_array_buffer; glGetIntegerv(GL_ELEMENT_ARRAY_BUFFER_BINDING, &last_element_array_buffer); - GLint last_vertex_array; glGetIntegerv(GL_VERTEX_ARRAY_BINDING, &last_vertex_array); - GLint last_blend_src; glGetIntegerv(GL_BLEND_SRC, &last_blend_src); - GLint last_blend_dst; glGetIntegerv(GL_BLEND_DST, &last_blend_dst); - GLint last_blend_equation_rgb; glGetIntegerv(GL_BLEND_EQUATION_RGB, &last_blend_equation_rgb); - GLint last_blend_equation_alpha; glGetIntegerv(GL_BLEND_EQUATION_ALPHA, &last_blend_equation_alpha); - GLboolean last_enable_blend = glIsEnabled(GL_BLEND); - GLboolean last_enable_cull_face = glIsEnabled(GL_CULL_FACE); - GLboolean last_enable_depth_test = glIsEnabled(GL_DEPTH_TEST); - GLboolean last_enable_scissor_test = glIsEnabled(GL_SCISSOR_TEST); - - // Setup render state: alpha-blending enabled, no face culling, no depth testing, scissor enabled - glEnable(GL_BLEND); - glBlendEquation(GL_FUNC_ADD); - glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA); - glDisable(GL_CULL_FACE); - glDisable(GL_DEPTH_TEST); - glEnable(GL_SCISSOR_TEST); - glActiveTexture(GL_TEXTURE0); - - // Handle cases of screen coordinates != from framebuffer coordinates (e.g. retina displays) - ImGuiIO& io = ImGui::GetIO(); - float fb_height = io.DisplaySize.y * io.DisplayFramebufferScale.y; - draw_data->ScaleClipRects(io.DisplayFramebufferScale); - - // Setup orthographic projection matrix - const float ortho_projection[4][4] = - { - { 2.0f / io.DisplaySize.x, 0.0f, 0.0f, 0.0f }, - { 0.0f, 2.0f / -io.DisplaySize.y, 0.0f, 0.0f }, - { 0.0f, 0.0f, -1.0f, 0.0f }, - { -1.0f, 1.0f, 0.0f, 1.0f }, - }; - glUseProgram(g_ShaderHandle); - glUniform1i(g_AttribLocationTex, 0); - glUniformMatrix4fv(g_AttribLocationProjMtx, 1, GL_FALSE, &ortho_projection[0][0]); - glBindVertexArray(g_VaoHandle); - - for (int n = 0; n < draw_data->CmdListsCount; n++) - { - const ImDrawList* cmd_list = draw_data->CmdLists[n]; - const ImDrawIdx* idx_buffer_offset = 0; - - glBindBuffer(GL_ARRAY_BUFFER, g_VboHandle); - glBufferData(GL_ARRAY_BUFFER, (GLsizeiptr)cmd_list->VtxBuffer.size() * sizeof(ImDrawVert), (GLvoid*)&cmd_list->VtxBuffer.front(), GL_STREAM_DRAW); - - glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, g_ElementsHandle); - glBufferData(GL_ELEMENT_ARRAY_BUFFER, (GLsizeiptr)cmd_list->IdxBuffer.size() * sizeof(ImDrawIdx), (GLvoid*)&cmd_list->IdxBuffer.front(), GL_STREAM_DRAW); - - for (const ImDrawCmd* pcmd = cmd_list->CmdBuffer.begin(); pcmd != cmd_list->CmdBuffer.end(); pcmd++) - { - if (pcmd->UserCallback) - { - pcmd->UserCallback(cmd_list, pcmd); - } - else - { - glBindTexture(GL_TEXTURE_2D, (GLuint)(intptr_t)pcmd->TextureId); - glScissor((int)pcmd->ClipRect.x, (int)(fb_height - pcmd->ClipRect.w), (int)(pcmd->ClipRect.z - pcmd->ClipRect.x), (int)(pcmd->ClipRect.w - pcmd->ClipRect.y)); - glDrawElements(GL_TRIANGLES, (GLsizei)pcmd->ElemCount, GL_UNSIGNED_SHORT, idx_buffer_offset); - } - idx_buffer_offset += pcmd->ElemCount; - } - } - - // Restore modified GL state - glUseProgram(last_program); - glBindTexture(GL_TEXTURE_2D, last_texture); - glBindBuffer(GL_ARRAY_BUFFER, last_array_buffer); - glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, last_element_array_buffer); - glBindVertexArray(last_vertex_array); - glBlendEquationSeparate(last_blend_equation_rgb, last_blend_equation_alpha); - glBlendFunc(last_blend_src, last_blend_dst); - if (last_enable_blend) glEnable(GL_BLEND); else glDisable(GL_BLEND); - if (last_enable_cull_face) glEnable(GL_CULL_FACE); else glDisable(GL_CULL_FACE); - if (last_enable_depth_test) glEnable(GL_DEPTH_TEST); else glDisable(GL_DEPTH_TEST); - if (last_enable_scissor_test) glEnable(GL_SCISSOR_TEST); else glDisable(GL_SCISSOR_TEST); -} - -static const char* ImGui_ImplSdlOgl3_GetClipboardText() -{ - return SDL_GetClipboardText(); -} - -static void ImGui_ImplSdlOgl3_SetClipboardText(const char* text) -{ - SDL_SetClipboardText(text); -} - -bool ImGui_ImplSdlOgl3_ProcessEvent(SDL_Event* event) -{ - ImGuiIO& io = ImGui::GetIO(); - switch (event->type) - { - case SDL_MOUSEWHEEL: - { - if (event->wheel.y > 0) - g_MouseWheel = 1; - if (event->wheel.y < 0) - g_MouseWheel = -1; - return true; - } - case SDL_MOUSEBUTTONDOWN: - { - if (event->button.button == SDL_BUTTON_LEFT) g_MousePressed[0] = true; - if (event->button.button == SDL_BUTTON_RIGHT) g_MousePressed[1] = true; - if (event->button.button == SDL_BUTTON_MIDDLE) g_MousePressed[2] = true; - return true; - } - case SDL_TEXTINPUT: - { - ImGuiIO& io = ImGui::GetIO(); - io.AddInputCharactersUTF8(event->text.text); - return true; - } - case SDL_KEYDOWN: - case SDL_KEYUP: - { - int key = event->key.keysym.sym & ~SDLK_SCANCODE_MASK; - io.KeysDown[key] = (event->type == SDL_KEYDOWN); - io.KeyShift = ((SDL_GetModState() & KMOD_SHIFT) != 0); - io.KeyCtrl = ((SDL_GetModState() & KMOD_CTRL) != 0); - io.KeyAlt = ((SDL_GetModState() & KMOD_ALT) != 0); - return true; - } - } - return false; -} - -void ImGui_ImplSdlOgl3_CreateFontsTexture() -{ - ImGuiIO& io = ImGui::GetIO(); - - // Build texture atlas - unsigned char* pixels; - int width, height; - io.Fonts->GetTexDataAsRGBA32(&pixels, &width, &height); // Load as RGBA 32-bits for OpenGL3 demo because it is more likely to be compatible with user's existing shader. - - // Create OpenGL texture - glGenTextures(1, &g_FontTexture); - glBindTexture(GL_TEXTURE_2D, g_FontTexture); - glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); - glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); - glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, pixels); - - // Store our identifier - io.Fonts->TexID = (void *)(intptr_t)g_FontTexture; - - // Cleanup (don't clear the input data if you want to append new fonts later) - io.Fonts->ClearInputData(); - io.Fonts->ClearTexData(); -} - -bool ImGui_ImplSdlOgl3_CreateDeviceObjects() -{ - // Backup GL state - GLint last_texture, last_array_buffer, last_vertex_array; - glGetIntegerv(GL_TEXTURE_BINDING_2D, &last_texture); - glGetIntegerv(GL_ARRAY_BUFFER_BINDING, &last_array_buffer); - glGetIntegerv(GL_VERTEX_ARRAY_BINDING, &last_vertex_array); - - const GLchar *vertex_shader = - "#version 330\n" - "uniform mat4 ProjMtx;\n" - "in vec2 Position;\n" - "in vec2 UV;\n" - "in vec4 Color;\n" - "out vec2 Frag_UV;\n" - "out vec4 Frag_Color;\n" - "void main()\n" - "{\n" - " Frag_UV = UV;\n" - " Frag_Color = Color;\n" - " gl_Position = ProjMtx * vec4(Position.xy,0,1);\n" - "}\n"; - - const GLchar* fragment_shader = - "#version 330\n" - "uniform sampler2D Texture;\n" - "in vec2 Frag_UV;\n" - "in vec4 Frag_Color;\n" - "out vec4 Out_Color;\n" - "void main()\n" - "{\n" - " Out_Color = Frag_Color * texture( Texture, Frag_UV.st);\n" - "}\n"; - - g_ShaderHandle = glCreateProgram(); - g_VertHandle = glCreateShader(GL_VERTEX_SHADER); - g_FragHandle = glCreateShader(GL_FRAGMENT_SHADER); - glShaderSource(g_VertHandle, 1, &vertex_shader, 0); - glShaderSource(g_FragHandle, 1, &fragment_shader, 0); - glCompileShader(g_VertHandle); - glCompileShader(g_FragHandle); - glAttachShader(g_ShaderHandle, g_VertHandle); - glAttachShader(g_ShaderHandle, g_FragHandle); - glLinkProgram(g_ShaderHandle); - - g_AttribLocationTex = glGetUniformLocation(g_ShaderHandle, "Texture"); - g_AttribLocationProjMtx = glGetUniformLocation(g_ShaderHandle, "ProjMtx"); - g_AttribLocationPosition = glGetAttribLocation(g_ShaderHandle, "Position"); - g_AttribLocationUV = glGetAttribLocation(g_ShaderHandle, "UV"); - g_AttribLocationColor = glGetAttribLocation(g_ShaderHandle, "Color"); - - glGenBuffers(1, &g_VboHandle); - glGenBuffers(1, &g_ElementsHandle); - - glGenVertexArrays(1, &g_VaoHandle); - glBindVertexArray(g_VaoHandle); - glBindBuffer(GL_ARRAY_BUFFER, g_VboHandle); - glEnableVertexAttribArray(g_AttribLocationPosition); - glEnableVertexAttribArray(g_AttribLocationUV); - glEnableVertexAttribArray(g_AttribLocationColor); - -#define OFFSETOF(TYPE, ELEMENT) ((size_t)&(((TYPE *)0)->ELEMENT)) - glVertexAttribPointer(g_AttribLocationPosition, 2, GL_FLOAT, GL_FALSE, sizeof(ImDrawVert), (GLvoid*)OFFSETOF(ImDrawVert, pos)); - glVertexAttribPointer(g_AttribLocationUV, 2, GL_FLOAT, GL_FALSE, sizeof(ImDrawVert), (GLvoid*)OFFSETOF(ImDrawVert, uv)); - glVertexAttribPointer(g_AttribLocationColor, 4, GL_UNSIGNED_BYTE, GL_TRUE, sizeof(ImDrawVert), (GLvoid*)OFFSETOF(ImDrawVert, col)); -#undef OFFSETOF - - ImGui_ImplSdlOgl3_CreateFontsTexture(); - - // Restore modified GL state - glBindTexture(GL_TEXTURE_2D, last_texture); - glBindBuffer(GL_ARRAY_BUFFER, last_array_buffer); - glBindVertexArray(last_vertex_array); - - return true; -} - -void ImGui_ImplSdlOgl3_InvalidateDeviceObjects() -{ - if (g_FontTexture) - { - glDeleteTextures(1, &g_FontTexture); - ImGui::GetIO().Fonts->TexID = 0; - g_FontTexture = 0; - } -} - -bool ImGui_ImplSdlOgl3_Init(SDL_Window *window) -{ - g_Window = window; - - ImGuiIO& io = ImGui::GetIO(); - io.KeyMap[ImGuiKey_Tab] = SDLK_TAB; // Keyboard mapping. ImGui will use those indices to peek into the io.KeyDown[] array. - io.KeyMap[ImGuiKey_LeftArrow] = SDL_SCANCODE_LEFT; - io.KeyMap[ImGuiKey_RightArrow] = SDL_SCANCODE_RIGHT; - io.KeyMap[ImGuiKey_UpArrow] = SDL_SCANCODE_UP; - io.KeyMap[ImGuiKey_DownArrow] = SDL_SCANCODE_DOWN; - io.KeyMap[ImGuiKey_PageUp] = SDL_SCANCODE_PAGEUP; - io.KeyMap[ImGuiKey_PageDown] = SDL_SCANCODE_PAGEDOWN; - io.KeyMap[ImGuiKey_Home] = SDL_SCANCODE_HOME; - io.KeyMap[ImGuiKey_End] = SDL_SCANCODE_END; - io.KeyMap[ImGuiKey_Delete] = SDLK_DELETE; - io.KeyMap[ImGuiKey_Backspace] = SDLK_BACKSPACE; - io.KeyMap[ImGuiKey_Enter] = SDLK_RETURN; - io.KeyMap[ImGuiKey_Escape] = SDLK_ESCAPE; - io.KeyMap[ImGuiKey_A] = SDLK_a; - io.KeyMap[ImGuiKey_C] = SDLK_c; - io.KeyMap[ImGuiKey_V] = SDLK_v; - io.KeyMap[ImGuiKey_X] = SDLK_x; - io.KeyMap[ImGuiKey_Y] = SDLK_y; - io.KeyMap[ImGuiKey_Z] = SDLK_z; - - io.RenderDrawListsFn = ImGui_ImplSdlOgl3_RenderDrawLists; // Alternatively you can set this to NULL and call ImGui::GetDrawData() after ImGui::Render() to get the same ImDrawData pointer. - io.SetClipboardTextFn = ImGui_ImplSdlOgl3_SetClipboardText; - io.GetClipboardTextFn = ImGui_ImplSdlOgl3_GetClipboardText; - -#ifdef _WIN32 - SDL_SysWMinfo wmInfo; - SDL_VERSION(&wmInfo.version); - SDL_GetWindowWMInfo(window, &wmInfo); - io.ImeWindowHandle = wmInfo.info.win.window; -#endif - - return true; -} - -void ImGui_ImplSdlOgl3_Shutdown() -{ - if (g_VaoHandle) glDeleteVertexArrays(1, &g_VaoHandle); - if (g_VboHandle) glDeleteBuffers(1, &g_VboHandle); - if (g_ElementsHandle) glDeleteBuffers(1, &g_ElementsHandle); - g_VaoHandle = g_VboHandle = g_ElementsHandle = 0; - - glDetachShader(g_ShaderHandle, g_VertHandle); - glDeleteShader(g_VertHandle); - g_VertHandle = 0; - - glDetachShader(g_ShaderHandle, g_FragHandle); - glDeleteShader(g_FragHandle); - g_FragHandle = 0; - - glDeleteProgram(g_ShaderHandle); - g_ShaderHandle = 0; - - if (g_FontTexture) - { - glDeleteTextures(1, &g_FontTexture); - ImGui::GetIO().Fonts->TexID = 0; - g_FontTexture = 0; - } - ImGui::Shutdown(); -} - -void ImGui_ImplSdlOgl3_NewFrame(SDL_Window *window) -{ - if (!g_FontTexture) - ImGui_ImplSdlOgl3_CreateDeviceObjects(); - - ImGuiIO& io = ImGui::GetIO(); - - // Setup display size (every frame to accommodate for window resizing) - int w, h; - int display_w, display_h; - SDL_GetWindowSize(window, &w, &h); - SDL_GetWindowSize(window, &display_w, &display_h); - io.DisplaySize = ImVec2((float)w, (float)h); - io.DisplayFramebufferScale = ImVec2((float)display_w / w, (float)display_h / h); - - // Setup time step - Uint32 time = SDL_GetTicks(); - double current_time = time / 1000.0; - io.DeltaTime = g_Time > 0.0 ? (float)(current_time - g_Time) : (float)(1.0f / 60.0f); - g_Time = current_time; - - // Setup inputs - // (we already got mouse wheel, keyboard keys & characters from glfw callbacks polled in glfwPollEvents()) - int mx, my; - Uint32 mouseMask = SDL_GetMouseState(&mx, &my); - if (SDL_GetWindowFlags(window) & SDL_WINDOW_MOUSE_FOCUS) - io.MousePos = ImVec2((float)mx, (float)my); // Mouse position, in pixels (set to -1,-1 if no mouse / on another screen, etc.) - else - io.MousePos = ImVec2(-1, -1); - - io.MouseDown[0] = g_MousePressed[0] || (mouseMask & SDL_BUTTON(SDL_BUTTON_LEFT)) != 0; // If a mouse press event came, always pass it as "mouse held this frame", so we don't miss click-release events that are shorter than 1 frame. - io.MouseDown[1] = g_MousePressed[1] || (mouseMask & SDL_BUTTON(SDL_BUTTON_RIGHT)) != 0; - io.MouseDown[2] = g_MousePressed[2] || (mouseMask & SDL_BUTTON(SDL_BUTTON_MIDDLE)) != 0; - g_MousePressed[0] = g_MousePressed[1] = g_MousePressed[2] = false; - - io.MouseWheel = g_MouseWheel; - g_MouseWheel = 0.0f; - - // Hide OS mouse cursor if ImGui is drawing it - SDL_ShowCursor(io.MouseDrawCursor ? 0 : 1); - - // Start the frame - ImGui::NewFrame(); -} \ No newline at end of file diff --git a/examples/sdl_opengl3_example/imgui_impl_sdlogl3.h b/examples/sdl_opengl3_example/imgui_impl_sdlogl3.h deleted file mode 100644 index 812efce..0000000 --- a/examples/sdl_opengl3_example/imgui_impl_sdlogl3.h +++ /dev/null @@ -1,14 +0,0 @@ -// ImGui SDL2 binding with OpenGL3 -// https://github.com/ocornut/imgui - -struct SDL_Window; -typedef union SDL_Event SDL_Event; - -IMGUI_API bool ImGui_ImplSdlOgl3_Init(SDL_Window *window); -IMGUI_API void ImGui_ImplSdlOgl3_Shutdown(); -IMGUI_API void ImGui_ImplSdlOgl3_NewFrame(SDL_Window *window); -IMGUI_API bool ImGui_ImplSdlOgl3_ProcessEvent(SDL_Event* event); - -// Use if you want to reset your rendering device without losing ImGui state. -IMGUI_API void ImGui_ImplSdlOgl3_InvalidateDeviceObjects(); -IMGUI_API bool ImGui_ImplSdlOgl3_CreateDeviceObjects(); diff --git a/examples/sdl_opengl3_example/README.md b/examples/sdl_opengl3_example/README.md index f0b83b2..a0d94cf 100644 --- a/examples/sdl_opengl3_example/README.md +++ b/examples/sdl_opengl3_example/README.md @@ -1,8 +1,22 @@ # How to Build -Link -=== -OpenGL -SDL2 -GLEW \ No newline at end of file +- On Windows with Visual Studio's CLI + +``` +set SDL2DIR=path_to_your_sdl2_folder +cl /Zi /MD /I ..\.. /I ..\libs\gl3w /I %SDL2DIR%\include main.cpp imgui_impl_sdl_gl3.cpp ..\..\imgui*.cpp ..\libs\gl3w\GL\gl3w.c /link /libpath:%SDL2DIR%\lib\x86 SDL2.lib SDL2main.lib opengl32.lib /subsystem:console +``` + +- On Linux and similar Unixes + +``` +c++ `sdl2-config --cflags` -I ../.. -I ../libs/gl3w main.cpp imgui_impl_sdl.cpp ../../imgui*.cpp ../libs/gl3w/GL/gl3w.c `sdl2-config --libs` -lGL -o sdl2example +``` + +- On Mac OS X + +``` +brew install sdl2 +c++ `sdl2-config --cflags` -I ../.. -I ../libs/gl3w main.cpp imgui_impl_sdl.cpp ../../imgui*.cpp ../libs/gl3w/GL/gl3w.c `sdl2-config --libs` -framework OpenGl -o sdl2example +``` diff --git a/examples/sdl_opengl3_example/imgui_impl_sdl_gl3.cpp b/examples/sdl_opengl3_example/imgui_impl_sdl_gl3.cpp new file mode 100644 index 0000000..fdf3ff5 --- /dev/null +++ b/examples/sdl_opengl3_example/imgui_impl_sdl_gl3.cpp @@ -0,0 +1,379 @@ +// ImGui SDL2 binding with OpenGL3 +// https://github.com/ocornut/imgui + +#include +#include +#include +#include "imgui.h" +#include "imgui_impl_sdl_gl3.h" + +// Data +static SDL_Window* g_Window = NULL; +static double g_Time = 0.0f; +static bool g_MousePressed[3] = { false, false, false }; +static float g_MouseWheel = 0.0f; +static GLuint g_FontTexture = 0; +static int g_ShaderHandle = 0, g_VertHandle = 0, g_FragHandle = 0; +static int g_AttribLocationTex = 0, g_AttribLocationProjMtx = 0; +static int g_AttribLocationPosition = 0, g_AttribLocationUV = 0, g_AttribLocationColor = 0; +static unsigned int g_VboHandle = 0, g_VaoHandle = 0, g_ElementsHandle = 0; + +// This is the main rendering function that you have to implement and provide to ImGui (via setting up 'RenderDrawListsFn' in the ImGuiIO structure) +// If text or lines are blurry when integrating ImGui in your engine: +// - in your Render function, try translating your projection matrix by (0.5f,0.5f) or (0.375f,0.375f) +void ImGui_ImplSdlGL3_RenderDrawLists(ImDrawData* draw_data) +{ + // Backup GL state + GLint last_program; glGetIntegerv(GL_CURRENT_PROGRAM, &last_program); + GLint last_texture; glGetIntegerv(GL_TEXTURE_BINDING_2D, &last_texture); + GLint last_array_buffer; glGetIntegerv(GL_ARRAY_BUFFER_BINDING, &last_array_buffer); + GLint last_element_array_buffer; glGetIntegerv(GL_ELEMENT_ARRAY_BUFFER_BINDING, &last_element_array_buffer); + GLint last_vertex_array; glGetIntegerv(GL_VERTEX_ARRAY_BINDING, &last_vertex_array); + GLint last_blend_src; glGetIntegerv(GL_BLEND_SRC, &last_blend_src); + GLint last_blend_dst; glGetIntegerv(GL_BLEND_DST, &last_blend_dst); + GLint last_blend_equation_rgb; glGetIntegerv(GL_BLEND_EQUATION_RGB, &last_blend_equation_rgb); + GLint last_blend_equation_alpha; glGetIntegerv(GL_BLEND_EQUATION_ALPHA, &last_blend_equation_alpha); + GLboolean last_enable_blend = glIsEnabled(GL_BLEND); + GLboolean last_enable_cull_face = glIsEnabled(GL_CULL_FACE); + GLboolean last_enable_depth_test = glIsEnabled(GL_DEPTH_TEST); + GLboolean last_enable_scissor_test = glIsEnabled(GL_SCISSOR_TEST); + + // Setup render state: alpha-blending enabled, no face culling, no depth testing, scissor enabled + glEnable(GL_BLEND); + glBlendEquation(GL_FUNC_ADD); + glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA); + glDisable(GL_CULL_FACE); + glDisable(GL_DEPTH_TEST); + glEnable(GL_SCISSOR_TEST); + glActiveTexture(GL_TEXTURE0); + + // Handle cases of screen coordinates != from framebuffer coordinates (e.g. retina displays) + ImGuiIO& io = ImGui::GetIO(); + float fb_height = io.DisplaySize.y * io.DisplayFramebufferScale.y; + draw_data->ScaleClipRects(io.DisplayFramebufferScale); + + // Setup orthographic projection matrix + const float ortho_projection[4][4] = + { + { 2.0f / io.DisplaySize.x, 0.0f, 0.0f, 0.0f }, + { 0.0f, 2.0f / -io.DisplaySize.y, 0.0f, 0.0f }, + { 0.0f, 0.0f, -1.0f, 0.0f }, + { -1.0f, 1.0f, 0.0f, 1.0f }, + }; + glUseProgram(g_ShaderHandle); + glUniform1i(g_AttribLocationTex, 0); + glUniformMatrix4fv(g_AttribLocationProjMtx, 1, GL_FALSE, &ortho_projection[0][0]); + glBindVertexArray(g_VaoHandle); + + for (int n = 0; n < draw_data->CmdListsCount; n++) + { + const ImDrawList* cmd_list = draw_data->CmdLists[n]; + const ImDrawIdx* idx_buffer_offset = 0; + + glBindBuffer(GL_ARRAY_BUFFER, g_VboHandle); + glBufferData(GL_ARRAY_BUFFER, (GLsizeiptr)cmd_list->VtxBuffer.size() * sizeof(ImDrawVert), (GLvoid*)&cmd_list->VtxBuffer.front(), GL_STREAM_DRAW); + + glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, g_ElementsHandle); + glBufferData(GL_ELEMENT_ARRAY_BUFFER, (GLsizeiptr)cmd_list->IdxBuffer.size() * sizeof(ImDrawIdx), (GLvoid*)&cmd_list->IdxBuffer.front(), GL_STREAM_DRAW); + + for (const ImDrawCmd* pcmd = cmd_list->CmdBuffer.begin(); pcmd != cmd_list->CmdBuffer.end(); pcmd++) + { + if (pcmd->UserCallback) + { + pcmd->UserCallback(cmd_list, pcmd); + } + else + { + glBindTexture(GL_TEXTURE_2D, (GLuint)(intptr_t)pcmd->TextureId); + glScissor((int)pcmd->ClipRect.x, (int)(fb_height - pcmd->ClipRect.w), (int)(pcmd->ClipRect.z - pcmd->ClipRect.x), (int)(pcmd->ClipRect.w - pcmd->ClipRect.y)); + glDrawElements(GL_TRIANGLES, (GLsizei)pcmd->ElemCount, GL_UNSIGNED_SHORT, idx_buffer_offset); + } + idx_buffer_offset += pcmd->ElemCount; + } + } + + // Restore modified GL state + glUseProgram(last_program); + glBindTexture(GL_TEXTURE_2D, last_texture); + glBindBuffer(GL_ARRAY_BUFFER, last_array_buffer); + glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, last_element_array_buffer); + glBindVertexArray(last_vertex_array); + glBlendEquationSeparate(last_blend_equation_rgb, last_blend_equation_alpha); + glBlendFunc(last_blend_src, last_blend_dst); + if (last_enable_blend) glEnable(GL_BLEND); else glDisable(GL_BLEND); + if (last_enable_cull_face) glEnable(GL_CULL_FACE); else glDisable(GL_CULL_FACE); + if (last_enable_depth_test) glEnable(GL_DEPTH_TEST); else glDisable(GL_DEPTH_TEST); + if (last_enable_scissor_test) glEnable(GL_SCISSOR_TEST); else glDisable(GL_SCISSOR_TEST); +} + +static const char* ImGui_ImplSdlGL3_GetClipboardText() +{ + return SDL_GetClipboardText(); +} + +static void ImGui_ImplSdlGL3_SetClipboardText(const char* text) +{ + SDL_SetClipboardText(text); +} + +bool ImGui_ImplSdlGL3_ProcessEvent(SDL_Event* event) +{ + ImGuiIO& io = ImGui::GetIO(); + switch (event->type) + { + case SDL_MOUSEWHEEL: + { + if (event->wheel.y > 0) + g_MouseWheel = 1; + if (event->wheel.y < 0) + g_MouseWheel = -1; + return true; + } + case SDL_MOUSEBUTTONDOWN: + { + if (event->button.button == SDL_BUTTON_LEFT) g_MousePressed[0] = true; + if (event->button.button == SDL_BUTTON_RIGHT) g_MousePressed[1] = true; + if (event->button.button == SDL_BUTTON_MIDDLE) g_MousePressed[2] = true; + return true; + } + case SDL_TEXTINPUT: + { + ImGuiIO& io = ImGui::GetIO(); + io.AddInputCharactersUTF8(event->text.text); + return true; + } + case SDL_KEYDOWN: + case SDL_KEYUP: + { + int key = event->key.keysym.sym & ~SDLK_SCANCODE_MASK; + io.KeysDown[key] = (event->type == SDL_KEYDOWN); + io.KeyShift = ((SDL_GetModState() & KMOD_SHIFT) != 0); + io.KeyCtrl = ((SDL_GetModState() & KMOD_CTRL) != 0); + io.KeyAlt = ((SDL_GetModState() & KMOD_ALT) != 0); + return true; + } + } + return false; +} + +void ImGui_ImplSdlGL3_CreateFontsTexture() +{ + ImGuiIO& io = ImGui::GetIO(); + + // Build texture atlas + unsigned char* pixels; + int width, height; + io.Fonts->GetTexDataAsRGBA32(&pixels, &width, &height); // Load as RGBA 32-bits for OpenGL3 demo because it is more likely to be compatible with user's existing shader. + + // Create OpenGL texture + glGenTextures(1, &g_FontTexture); + glBindTexture(GL_TEXTURE_2D, g_FontTexture); + glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); + glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); + glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, pixels); + + // Store our identifier + io.Fonts->TexID = (void *)(intptr_t)g_FontTexture; + + // Cleanup (don't clear the input data if you want to append new fonts later) + io.Fonts->ClearInputData(); + io.Fonts->ClearTexData(); +} + +bool ImGui_ImplSdlGL3_CreateDeviceObjects() +{ + // Backup GL state + GLint last_texture, last_array_buffer, last_vertex_array; + glGetIntegerv(GL_TEXTURE_BINDING_2D, &last_texture); + glGetIntegerv(GL_ARRAY_BUFFER_BINDING, &last_array_buffer); + glGetIntegerv(GL_VERTEX_ARRAY_BINDING, &last_vertex_array); + + const GLchar *vertex_shader = + "#version 330\n" + "uniform mat4 ProjMtx;\n" + "in vec2 Position;\n" + "in vec2 UV;\n" + "in vec4 Color;\n" + "out vec2 Frag_UV;\n" + "out vec4 Frag_Color;\n" + "void main()\n" + "{\n" + " Frag_UV = UV;\n" + " Frag_Color = Color;\n" + " gl_Position = ProjMtx * vec4(Position.xy,0,1);\n" + "}\n"; + + const GLchar* fragment_shader = + "#version 330\n" + "uniform sampler2D Texture;\n" + "in vec2 Frag_UV;\n" + "in vec4 Frag_Color;\n" + "out vec4 Out_Color;\n" + "void main()\n" + "{\n" + " Out_Color = Frag_Color * texture( Texture, Frag_UV.st);\n" + "}\n"; + + g_ShaderHandle = glCreateProgram(); + g_VertHandle = glCreateShader(GL_VERTEX_SHADER); + g_FragHandle = glCreateShader(GL_FRAGMENT_SHADER); + glShaderSource(g_VertHandle, 1, &vertex_shader, 0); + glShaderSource(g_FragHandle, 1, &fragment_shader, 0); + glCompileShader(g_VertHandle); + glCompileShader(g_FragHandle); + glAttachShader(g_ShaderHandle, g_VertHandle); + glAttachShader(g_ShaderHandle, g_FragHandle); + glLinkProgram(g_ShaderHandle); + + g_AttribLocationTex = glGetUniformLocation(g_ShaderHandle, "Texture"); + g_AttribLocationProjMtx = glGetUniformLocation(g_ShaderHandle, "ProjMtx"); + g_AttribLocationPosition = glGetAttribLocation(g_ShaderHandle, "Position"); + g_AttribLocationUV = glGetAttribLocation(g_ShaderHandle, "UV"); + g_AttribLocationColor = glGetAttribLocation(g_ShaderHandle, "Color"); + + glGenBuffers(1, &g_VboHandle); + glGenBuffers(1, &g_ElementsHandle); + + glGenVertexArrays(1, &g_VaoHandle); + glBindVertexArray(g_VaoHandle); + glBindBuffer(GL_ARRAY_BUFFER, g_VboHandle); + glEnableVertexAttribArray(g_AttribLocationPosition); + glEnableVertexAttribArray(g_AttribLocationUV); + glEnableVertexAttribArray(g_AttribLocationColor); + +#define OFFSETOF(TYPE, ELEMENT) ((size_t)&(((TYPE *)0)->ELEMENT)) + glVertexAttribPointer(g_AttribLocationPosition, 2, GL_FLOAT, GL_FALSE, sizeof(ImDrawVert), (GLvoid*)OFFSETOF(ImDrawVert, pos)); + glVertexAttribPointer(g_AttribLocationUV, 2, GL_FLOAT, GL_FALSE, sizeof(ImDrawVert), (GLvoid*)OFFSETOF(ImDrawVert, uv)); + glVertexAttribPointer(g_AttribLocationColor, 4, GL_UNSIGNED_BYTE, GL_TRUE, sizeof(ImDrawVert), (GLvoid*)OFFSETOF(ImDrawVert, col)); +#undef OFFSETOF + + ImGui_ImplSdlGL3_CreateFontsTexture(); + + // Restore modified GL state + glBindTexture(GL_TEXTURE_2D, last_texture); + glBindBuffer(GL_ARRAY_BUFFER, last_array_buffer); + glBindVertexArray(last_vertex_array); + + return true; +} + +void ImGui_ImplSdlGL3_InvalidateDeviceObjects() +{ + if (g_FontTexture) + { + glDeleteTextures(1, &g_FontTexture); + ImGui::GetIO().Fonts->TexID = 0; + g_FontTexture = 0; + } +} + +bool ImGui_ImplSdlGL3_Init(SDL_Window *window) +{ + g_Window = window; + + ImGuiIO& io = ImGui::GetIO(); + io.KeyMap[ImGuiKey_Tab] = SDLK_TAB; // Keyboard mapping. ImGui will use those indices to peek into the io.KeyDown[] array. + io.KeyMap[ImGuiKey_LeftArrow] = SDL_SCANCODE_LEFT; + io.KeyMap[ImGuiKey_RightArrow] = SDL_SCANCODE_RIGHT; + io.KeyMap[ImGuiKey_UpArrow] = SDL_SCANCODE_UP; + io.KeyMap[ImGuiKey_DownArrow] = SDL_SCANCODE_DOWN; + io.KeyMap[ImGuiKey_PageUp] = SDL_SCANCODE_PAGEUP; + io.KeyMap[ImGuiKey_PageDown] = SDL_SCANCODE_PAGEDOWN; + io.KeyMap[ImGuiKey_Home] = SDL_SCANCODE_HOME; + io.KeyMap[ImGuiKey_End] = SDL_SCANCODE_END; + io.KeyMap[ImGuiKey_Delete] = SDLK_DELETE; + io.KeyMap[ImGuiKey_Backspace] = SDLK_BACKSPACE; + io.KeyMap[ImGuiKey_Enter] = SDLK_RETURN; + io.KeyMap[ImGuiKey_Escape] = SDLK_ESCAPE; + io.KeyMap[ImGuiKey_A] = SDLK_a; + io.KeyMap[ImGuiKey_C] = SDLK_c; + io.KeyMap[ImGuiKey_V] = SDLK_v; + io.KeyMap[ImGuiKey_X] = SDLK_x; + io.KeyMap[ImGuiKey_Y] = SDLK_y; + io.KeyMap[ImGuiKey_Z] = SDLK_z; + + io.RenderDrawListsFn = ImGui_ImplSdlGL3_RenderDrawLists; // Alternatively you can set this to NULL and call ImGui::GetDrawData() after ImGui::Render() to get the same ImDrawData pointer. + io.SetClipboardTextFn = ImGui_ImplSdlGL3_SetClipboardText; + io.GetClipboardTextFn = ImGui_ImplSdlGL3_GetClipboardText; + +#ifdef _WIN32 + SDL_SysWMinfo wmInfo; + SDL_VERSION(&wmInfo.version); + SDL_GetWindowWMInfo(window, &wmInfo); + io.ImeWindowHandle = wmInfo.info.win.window; +#endif + + return true; +} + +void ImGui_ImplSdlGL3_Shutdown() +{ + if (g_VaoHandle) glDeleteVertexArrays(1, &g_VaoHandle); + if (g_VboHandle) glDeleteBuffers(1, &g_VboHandle); + if (g_ElementsHandle) glDeleteBuffers(1, &g_ElementsHandle); + g_VaoHandle = g_VboHandle = g_ElementsHandle = 0; + + glDetachShader(g_ShaderHandle, g_VertHandle); + glDeleteShader(g_VertHandle); + g_VertHandle = 0; + + glDetachShader(g_ShaderHandle, g_FragHandle); + glDeleteShader(g_FragHandle); + g_FragHandle = 0; + + glDeleteProgram(g_ShaderHandle); + g_ShaderHandle = 0; + + if (g_FontTexture) + { + glDeleteTextures(1, &g_FontTexture); + ImGui::GetIO().Fonts->TexID = 0; + g_FontTexture = 0; + } + ImGui::Shutdown(); +} + +void ImGui_ImplSdlGL3_NewFrame(SDL_Window *window) +{ + if (!g_FontTexture) + ImGui_ImplSdlGL3_CreateDeviceObjects(); + + ImGuiIO& io = ImGui::GetIO(); + + // Setup display size (every frame to accommodate for window resizing) + int w, h; + int display_w, display_h; + SDL_GetWindowSize(window, &w, &h); + SDL_GetWindowSize(window, &display_w, &display_h); + io.DisplaySize = ImVec2((float)w, (float)h); + io.DisplayFramebufferScale = ImVec2((float)display_w / w, (float)display_h / h); + + // Setup time step + Uint32 time = SDL_GetTicks(); + double current_time = time / 1000.0; + io.DeltaTime = g_Time > 0.0 ? (float)(current_time - g_Time) : (float)(1.0f / 60.0f); + g_Time = current_time; + + // Setup inputs + // (we already got mouse wheel, keyboard keys & characters from glfw callbacks polled in glfwPollEvents()) + int mx, my; + Uint32 mouseMask = SDL_GetMouseState(&mx, &my); + if (SDL_GetWindowFlags(window) & SDL_WINDOW_MOUSE_FOCUS) + io.MousePos = ImVec2((float)mx, (float)my); // Mouse position, in pixels (set to -1,-1 if no mouse / on another screen, etc.) + else + io.MousePos = ImVec2(-1, -1); + + io.MouseDown[0] = g_MousePressed[0] || (mouseMask & SDL_BUTTON(SDL_BUTTON_LEFT)) != 0; // If a mouse press event came, always pass it as "mouse held this frame", so we don't miss click-release events that are shorter than 1 frame. + io.MouseDown[1] = g_MousePressed[1] || (mouseMask & SDL_BUTTON(SDL_BUTTON_RIGHT)) != 0; + io.MouseDown[2] = g_MousePressed[2] || (mouseMask & SDL_BUTTON(SDL_BUTTON_MIDDLE)) != 0; + g_MousePressed[0] = g_MousePressed[1] = g_MousePressed[2] = false; + + io.MouseWheel = g_MouseWheel; + g_MouseWheel = 0.0f; + + // Hide OS mouse cursor if ImGui is drawing it + SDL_ShowCursor(io.MouseDrawCursor ? 0 : 1); + + // Start the frame + ImGui::NewFrame(); +} \ No newline at end of file diff --git a/examples/sdl_opengl3_example/imgui_impl_sdl_gl3.h b/examples/sdl_opengl3_example/imgui_impl_sdl_gl3.h new file mode 100644 index 0000000..e324b3d --- /dev/null +++ b/examples/sdl_opengl3_example/imgui_impl_sdl_gl3.h @@ -0,0 +1,14 @@ +// ImGui SDL2 binding with OpenGL3 +// https://github.com/ocornut/imgui + +struct SDL_Window; +typedef union SDL_Event SDL_Event; + +IMGUI_API bool ImGui_ImplSdlGL3_Init(SDL_Window *window); +IMGUI_API void ImGui_ImplSdlGL3_Shutdown(); +IMGUI_API void ImGui_ImplSdlGL3_NewFrame(SDL_Window *window); +IMGUI_API bool ImGui_ImplSdlGL3_ProcessEvent(SDL_Event* event); + +// Use if you want to reset your rendering device without losing ImGui state. +IMGUI_API void ImGui_ImplSdlGL3_InvalidateDeviceObjects(); +IMGUI_API bool ImGui_ImplSdlGL3_CreateDeviceObjects(); diff --git a/examples/sdl_opengl3_example/imgui_impl_sdlogl3.cpp b/examples/sdl_opengl3_example/imgui_impl_sdlogl3.cpp deleted file mode 100644 index 16a773f..0000000 --- a/examples/sdl_opengl3_example/imgui_impl_sdlogl3.cpp +++ /dev/null @@ -1,379 +0,0 @@ -// ImGui SDL2 binding with OpenGL3 -// https://github.com/ocornut/imgui - -#include -#include -#include -#include "imgui.h" -#include "imgui_impl_sdlogl3.h" - -// Data -static SDL_Window* g_Window = NULL; -static double g_Time = 0.0f; -static bool g_MousePressed[3] = { false, false, false }; -static float g_MouseWheel = 0.0f; -static GLuint g_FontTexture = 0; -static int g_ShaderHandle = 0, g_VertHandle = 0, g_FragHandle = 0; -static int g_AttribLocationTex = 0, g_AttribLocationProjMtx = 0; -static int g_AttribLocationPosition = 0, g_AttribLocationUV = 0, g_AttribLocationColor = 0; -static unsigned int g_VboHandle = 0, g_VaoHandle = 0, g_ElementsHandle = 0; - -// This is the main rendering function that you have to implement and provide to ImGui (via setting up 'RenderDrawListsFn' in the ImGuiIO structure) -// If text or lines are blurry when integrating ImGui in your engine: -// - in your Render function, try translating your projection matrix by (0.5f,0.5f) or (0.375f,0.375f) -void ImGui_ImplSdlOgl3_RenderDrawLists(ImDrawData* draw_data) -{ - // Backup GL state - GLint last_program; glGetIntegerv(GL_CURRENT_PROGRAM, &last_program); - GLint last_texture; glGetIntegerv(GL_TEXTURE_BINDING_2D, &last_texture); - GLint last_array_buffer; glGetIntegerv(GL_ARRAY_BUFFER_BINDING, &last_array_buffer); - GLint last_element_array_buffer; glGetIntegerv(GL_ELEMENT_ARRAY_BUFFER_BINDING, &last_element_array_buffer); - GLint last_vertex_array; glGetIntegerv(GL_VERTEX_ARRAY_BINDING, &last_vertex_array); - GLint last_blend_src; glGetIntegerv(GL_BLEND_SRC, &last_blend_src); - GLint last_blend_dst; glGetIntegerv(GL_BLEND_DST, &last_blend_dst); - GLint last_blend_equation_rgb; glGetIntegerv(GL_BLEND_EQUATION_RGB, &last_blend_equation_rgb); - GLint last_blend_equation_alpha; glGetIntegerv(GL_BLEND_EQUATION_ALPHA, &last_blend_equation_alpha); - GLboolean last_enable_blend = glIsEnabled(GL_BLEND); - GLboolean last_enable_cull_face = glIsEnabled(GL_CULL_FACE); - GLboolean last_enable_depth_test = glIsEnabled(GL_DEPTH_TEST); - GLboolean last_enable_scissor_test = glIsEnabled(GL_SCISSOR_TEST); - - // Setup render state: alpha-blending enabled, no face culling, no depth testing, scissor enabled - glEnable(GL_BLEND); - glBlendEquation(GL_FUNC_ADD); - glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA); - glDisable(GL_CULL_FACE); - glDisable(GL_DEPTH_TEST); - glEnable(GL_SCISSOR_TEST); - glActiveTexture(GL_TEXTURE0); - - // Handle cases of screen coordinates != from framebuffer coordinates (e.g. retina displays) - ImGuiIO& io = ImGui::GetIO(); - float fb_height = io.DisplaySize.y * io.DisplayFramebufferScale.y; - draw_data->ScaleClipRects(io.DisplayFramebufferScale); - - // Setup orthographic projection matrix - const float ortho_projection[4][4] = - { - { 2.0f / io.DisplaySize.x, 0.0f, 0.0f, 0.0f }, - { 0.0f, 2.0f / -io.DisplaySize.y, 0.0f, 0.0f }, - { 0.0f, 0.0f, -1.0f, 0.0f }, - { -1.0f, 1.0f, 0.0f, 1.0f }, - }; - glUseProgram(g_ShaderHandle); - glUniform1i(g_AttribLocationTex, 0); - glUniformMatrix4fv(g_AttribLocationProjMtx, 1, GL_FALSE, &ortho_projection[0][0]); - glBindVertexArray(g_VaoHandle); - - for (int n = 0; n < draw_data->CmdListsCount; n++) - { - const ImDrawList* cmd_list = draw_data->CmdLists[n]; - const ImDrawIdx* idx_buffer_offset = 0; - - glBindBuffer(GL_ARRAY_BUFFER, g_VboHandle); - glBufferData(GL_ARRAY_BUFFER, (GLsizeiptr)cmd_list->VtxBuffer.size() * sizeof(ImDrawVert), (GLvoid*)&cmd_list->VtxBuffer.front(), GL_STREAM_DRAW); - - glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, g_ElementsHandle); - glBufferData(GL_ELEMENT_ARRAY_BUFFER, (GLsizeiptr)cmd_list->IdxBuffer.size() * sizeof(ImDrawIdx), (GLvoid*)&cmd_list->IdxBuffer.front(), GL_STREAM_DRAW); - - for (const ImDrawCmd* pcmd = cmd_list->CmdBuffer.begin(); pcmd != cmd_list->CmdBuffer.end(); pcmd++) - { - if (pcmd->UserCallback) - { - pcmd->UserCallback(cmd_list, pcmd); - } - else - { - glBindTexture(GL_TEXTURE_2D, (GLuint)(intptr_t)pcmd->TextureId); - glScissor((int)pcmd->ClipRect.x, (int)(fb_height - pcmd->ClipRect.w), (int)(pcmd->ClipRect.z - pcmd->ClipRect.x), (int)(pcmd->ClipRect.w - pcmd->ClipRect.y)); - glDrawElements(GL_TRIANGLES, (GLsizei)pcmd->ElemCount, GL_UNSIGNED_SHORT, idx_buffer_offset); - } - idx_buffer_offset += pcmd->ElemCount; - } - } - - // Restore modified GL state - glUseProgram(last_program); - glBindTexture(GL_TEXTURE_2D, last_texture); - glBindBuffer(GL_ARRAY_BUFFER, last_array_buffer); - glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, last_element_array_buffer); - glBindVertexArray(last_vertex_array); - glBlendEquationSeparate(last_blend_equation_rgb, last_blend_equation_alpha); - glBlendFunc(last_blend_src, last_blend_dst); - if (last_enable_blend) glEnable(GL_BLEND); else glDisable(GL_BLEND); - if (last_enable_cull_face) glEnable(GL_CULL_FACE); else glDisable(GL_CULL_FACE); - if (last_enable_depth_test) glEnable(GL_DEPTH_TEST); else glDisable(GL_DEPTH_TEST); - if (last_enable_scissor_test) glEnable(GL_SCISSOR_TEST); else glDisable(GL_SCISSOR_TEST); -} - -static const char* ImGui_ImplSdlOgl3_GetClipboardText() -{ - return SDL_GetClipboardText(); -} - -static void ImGui_ImplSdlOgl3_SetClipboardText(const char* text) -{ - SDL_SetClipboardText(text); -} - -bool ImGui_ImplSdlOgl3_ProcessEvent(SDL_Event* event) -{ - ImGuiIO& io = ImGui::GetIO(); - switch (event->type) - { - case SDL_MOUSEWHEEL: - { - if (event->wheel.y > 0) - g_MouseWheel = 1; - if (event->wheel.y < 0) - g_MouseWheel = -1; - return true; - } - case SDL_MOUSEBUTTONDOWN: - { - if (event->button.button == SDL_BUTTON_LEFT) g_MousePressed[0] = true; - if (event->button.button == SDL_BUTTON_RIGHT) g_MousePressed[1] = true; - if (event->button.button == SDL_BUTTON_MIDDLE) g_MousePressed[2] = true; - return true; - } - case SDL_TEXTINPUT: - { - ImGuiIO& io = ImGui::GetIO(); - io.AddInputCharactersUTF8(event->text.text); - return true; - } - case SDL_KEYDOWN: - case SDL_KEYUP: - { - int key = event->key.keysym.sym & ~SDLK_SCANCODE_MASK; - io.KeysDown[key] = (event->type == SDL_KEYDOWN); - io.KeyShift = ((SDL_GetModState() & KMOD_SHIFT) != 0); - io.KeyCtrl = ((SDL_GetModState() & KMOD_CTRL) != 0); - io.KeyAlt = ((SDL_GetModState() & KMOD_ALT) != 0); - return true; - } - } - return false; -} - -void ImGui_ImplSdlOgl3_CreateFontsTexture() -{ - ImGuiIO& io = ImGui::GetIO(); - - // Build texture atlas - unsigned char* pixels; - int width, height; - io.Fonts->GetTexDataAsRGBA32(&pixels, &width, &height); // Load as RGBA 32-bits for OpenGL3 demo because it is more likely to be compatible with user's existing shader. - - // Create OpenGL texture - glGenTextures(1, &g_FontTexture); - glBindTexture(GL_TEXTURE_2D, g_FontTexture); - glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); - glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); - glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, pixels); - - // Store our identifier - io.Fonts->TexID = (void *)(intptr_t)g_FontTexture; - - // Cleanup (don't clear the input data if you want to append new fonts later) - io.Fonts->ClearInputData(); - io.Fonts->ClearTexData(); -} - -bool ImGui_ImplSdlOgl3_CreateDeviceObjects() -{ - // Backup GL state - GLint last_texture, last_array_buffer, last_vertex_array; - glGetIntegerv(GL_TEXTURE_BINDING_2D, &last_texture); - glGetIntegerv(GL_ARRAY_BUFFER_BINDING, &last_array_buffer); - glGetIntegerv(GL_VERTEX_ARRAY_BINDING, &last_vertex_array); - - const GLchar *vertex_shader = - "#version 330\n" - "uniform mat4 ProjMtx;\n" - "in vec2 Position;\n" - "in vec2 UV;\n" - "in vec4 Color;\n" - "out vec2 Frag_UV;\n" - "out vec4 Frag_Color;\n" - "void main()\n" - "{\n" - " Frag_UV = UV;\n" - " Frag_Color = Color;\n" - " gl_Position = ProjMtx * vec4(Position.xy,0,1);\n" - "}\n"; - - const GLchar* fragment_shader = - "#version 330\n" - "uniform sampler2D Texture;\n" - "in vec2 Frag_UV;\n" - "in vec4 Frag_Color;\n" - "out vec4 Out_Color;\n" - "void main()\n" - "{\n" - " Out_Color = Frag_Color * texture( Texture, Frag_UV.st);\n" - "}\n"; - - g_ShaderHandle = glCreateProgram(); - g_VertHandle = glCreateShader(GL_VERTEX_SHADER); - g_FragHandle = glCreateShader(GL_FRAGMENT_SHADER); - glShaderSource(g_VertHandle, 1, &vertex_shader, 0); - glShaderSource(g_FragHandle, 1, &fragment_shader, 0); - glCompileShader(g_VertHandle); - glCompileShader(g_FragHandle); - glAttachShader(g_ShaderHandle, g_VertHandle); - glAttachShader(g_ShaderHandle, g_FragHandle); - glLinkProgram(g_ShaderHandle); - - g_AttribLocationTex = glGetUniformLocation(g_ShaderHandle, "Texture"); - g_AttribLocationProjMtx = glGetUniformLocation(g_ShaderHandle, "ProjMtx"); - g_AttribLocationPosition = glGetAttribLocation(g_ShaderHandle, "Position"); - g_AttribLocationUV = glGetAttribLocation(g_ShaderHandle, "UV"); - g_AttribLocationColor = glGetAttribLocation(g_ShaderHandle, "Color"); - - glGenBuffers(1, &g_VboHandle); - glGenBuffers(1, &g_ElementsHandle); - - glGenVertexArrays(1, &g_VaoHandle); - glBindVertexArray(g_VaoHandle); - glBindBuffer(GL_ARRAY_BUFFER, g_VboHandle); - glEnableVertexAttribArray(g_AttribLocationPosition); - glEnableVertexAttribArray(g_AttribLocationUV); - glEnableVertexAttribArray(g_AttribLocationColor); - -#define OFFSETOF(TYPE, ELEMENT) ((size_t)&(((TYPE *)0)->ELEMENT)) - glVertexAttribPointer(g_AttribLocationPosition, 2, GL_FLOAT, GL_FALSE, sizeof(ImDrawVert), (GLvoid*)OFFSETOF(ImDrawVert, pos)); - glVertexAttribPointer(g_AttribLocationUV, 2, GL_FLOAT, GL_FALSE, sizeof(ImDrawVert), (GLvoid*)OFFSETOF(ImDrawVert, uv)); - glVertexAttribPointer(g_AttribLocationColor, 4, GL_UNSIGNED_BYTE, GL_TRUE, sizeof(ImDrawVert), (GLvoid*)OFFSETOF(ImDrawVert, col)); -#undef OFFSETOF - - ImGui_ImplSdlOgl3_CreateFontsTexture(); - - // Restore modified GL state - glBindTexture(GL_TEXTURE_2D, last_texture); - glBindBuffer(GL_ARRAY_BUFFER, last_array_buffer); - glBindVertexArray(last_vertex_array); - - return true; -} - -void ImGui_ImplSdlOgl3_InvalidateDeviceObjects() -{ - if (g_FontTexture) - { - glDeleteTextures(1, &g_FontTexture); - ImGui::GetIO().Fonts->TexID = 0; - g_FontTexture = 0; - } -} - -bool ImGui_ImplSdlOgl3_Init(SDL_Window *window) -{ - g_Window = window; - - ImGuiIO& io = ImGui::GetIO(); - io.KeyMap[ImGuiKey_Tab] = SDLK_TAB; // Keyboard mapping. ImGui will use those indices to peek into the io.KeyDown[] array. - io.KeyMap[ImGuiKey_LeftArrow] = SDL_SCANCODE_LEFT; - io.KeyMap[ImGuiKey_RightArrow] = SDL_SCANCODE_RIGHT; - io.KeyMap[ImGuiKey_UpArrow] = SDL_SCANCODE_UP; - io.KeyMap[ImGuiKey_DownArrow] = SDL_SCANCODE_DOWN; - io.KeyMap[ImGuiKey_PageUp] = SDL_SCANCODE_PAGEUP; - io.KeyMap[ImGuiKey_PageDown] = SDL_SCANCODE_PAGEDOWN; - io.KeyMap[ImGuiKey_Home] = SDL_SCANCODE_HOME; - io.KeyMap[ImGuiKey_End] = SDL_SCANCODE_END; - io.KeyMap[ImGuiKey_Delete] = SDLK_DELETE; - io.KeyMap[ImGuiKey_Backspace] = SDLK_BACKSPACE; - io.KeyMap[ImGuiKey_Enter] = SDLK_RETURN; - io.KeyMap[ImGuiKey_Escape] = SDLK_ESCAPE; - io.KeyMap[ImGuiKey_A] = SDLK_a; - io.KeyMap[ImGuiKey_C] = SDLK_c; - io.KeyMap[ImGuiKey_V] = SDLK_v; - io.KeyMap[ImGuiKey_X] = SDLK_x; - io.KeyMap[ImGuiKey_Y] = SDLK_y; - io.KeyMap[ImGuiKey_Z] = SDLK_z; - - io.RenderDrawListsFn = ImGui_ImplSdlOgl3_RenderDrawLists; // Alternatively you can set this to NULL and call ImGui::GetDrawData() after ImGui::Render() to get the same ImDrawData pointer. - io.SetClipboardTextFn = ImGui_ImplSdlOgl3_SetClipboardText; - io.GetClipboardTextFn = ImGui_ImplSdlOgl3_GetClipboardText; - -#ifdef _WIN32 - SDL_SysWMinfo wmInfo; - SDL_VERSION(&wmInfo.version); - SDL_GetWindowWMInfo(window, &wmInfo); - io.ImeWindowHandle = wmInfo.info.win.window; -#endif - - return true; -} - -void ImGui_ImplSdlOgl3_Shutdown() -{ - if (g_VaoHandle) glDeleteVertexArrays(1, &g_VaoHandle); - if (g_VboHandle) glDeleteBuffers(1, &g_VboHandle); - if (g_ElementsHandle) glDeleteBuffers(1, &g_ElementsHandle); - g_VaoHandle = g_VboHandle = g_ElementsHandle = 0; - - glDetachShader(g_ShaderHandle, g_VertHandle); - glDeleteShader(g_VertHandle); - g_VertHandle = 0; - - glDetachShader(g_ShaderHandle, g_FragHandle); - glDeleteShader(g_FragHandle); - g_FragHandle = 0; - - glDeleteProgram(g_ShaderHandle); - g_ShaderHandle = 0; - - if (g_FontTexture) - { - glDeleteTextures(1, &g_FontTexture); - ImGui::GetIO().Fonts->TexID = 0; - g_FontTexture = 0; - } - ImGui::Shutdown(); -} - -void ImGui_ImplSdlOgl3_NewFrame(SDL_Window *window) -{ - if (!g_FontTexture) - ImGui_ImplSdlOgl3_CreateDeviceObjects(); - - ImGuiIO& io = ImGui::GetIO(); - - // Setup display size (every frame to accommodate for window resizing) - int w, h; - int display_w, display_h; - SDL_GetWindowSize(window, &w, &h); - SDL_GetWindowSize(window, &display_w, &display_h); - io.DisplaySize = ImVec2((float)w, (float)h); - io.DisplayFramebufferScale = ImVec2((float)display_w / w, (float)display_h / h); - - // Setup time step - Uint32 time = SDL_GetTicks(); - double current_time = time / 1000.0; - io.DeltaTime = g_Time > 0.0 ? (float)(current_time - g_Time) : (float)(1.0f / 60.0f); - g_Time = current_time; - - // Setup inputs - // (we already got mouse wheel, keyboard keys & characters from glfw callbacks polled in glfwPollEvents()) - int mx, my; - Uint32 mouseMask = SDL_GetMouseState(&mx, &my); - if (SDL_GetWindowFlags(window) & SDL_WINDOW_MOUSE_FOCUS) - io.MousePos = ImVec2((float)mx, (float)my); // Mouse position, in pixels (set to -1,-1 if no mouse / on another screen, etc.) - else - io.MousePos = ImVec2(-1, -1); - - io.MouseDown[0] = g_MousePressed[0] || (mouseMask & SDL_BUTTON(SDL_BUTTON_LEFT)) != 0; // If a mouse press event came, always pass it as "mouse held this frame", so we don't miss click-release events that are shorter than 1 frame. - io.MouseDown[1] = g_MousePressed[1] || (mouseMask & SDL_BUTTON(SDL_BUTTON_RIGHT)) != 0; - io.MouseDown[2] = g_MousePressed[2] || (mouseMask & SDL_BUTTON(SDL_BUTTON_MIDDLE)) != 0; - g_MousePressed[0] = g_MousePressed[1] = g_MousePressed[2] = false; - - io.MouseWheel = g_MouseWheel; - g_MouseWheel = 0.0f; - - // Hide OS mouse cursor if ImGui is drawing it - SDL_ShowCursor(io.MouseDrawCursor ? 0 : 1); - - // Start the frame - ImGui::NewFrame(); -} \ No newline at end of file diff --git a/examples/sdl_opengl3_example/imgui_impl_sdlogl3.h b/examples/sdl_opengl3_example/imgui_impl_sdlogl3.h deleted file mode 100644 index 812efce..0000000 --- a/examples/sdl_opengl3_example/imgui_impl_sdlogl3.h +++ /dev/null @@ -1,14 +0,0 @@ -// ImGui SDL2 binding with OpenGL3 -// https://github.com/ocornut/imgui - -struct SDL_Window; -typedef union SDL_Event SDL_Event; - -IMGUI_API bool ImGui_ImplSdlOgl3_Init(SDL_Window *window); -IMGUI_API void ImGui_ImplSdlOgl3_Shutdown(); -IMGUI_API void ImGui_ImplSdlOgl3_NewFrame(SDL_Window *window); -IMGUI_API bool ImGui_ImplSdlOgl3_ProcessEvent(SDL_Event* event); - -// Use if you want to reset your rendering device without losing ImGui state. -IMGUI_API void ImGui_ImplSdlOgl3_InvalidateDeviceObjects(); -IMGUI_API bool ImGui_ImplSdlOgl3_CreateDeviceObjects(); diff --git a/examples/sdl_opengl3_example/main.cpp b/examples/sdl_opengl3_example/main.cpp index 0c5438f..24c37db 100644 --- a/examples/sdl_opengl3_example/main.cpp +++ b/examples/sdl_opengl3_example/main.cpp @@ -1,10 +1,10 @@ // ImGui - standalone example application for SDL2 + OpenGL #include -#include "imgui_impl_sdlogl3.h" +#include "imgui_impl_sdl_gl3.h" #include +#include #include -#include int main(int, char**) { @@ -23,11 +23,12 @@ SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 2); SDL_DisplayMode current; SDL_GetCurrentDisplayMode(0, ¤t); - SDL_Window *window = SDL_CreateWindow("ImGui SDL2+OpenGL example", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, 1280, 720, SDL_WINDOW_OPENGL|SDL_WINDOW_RESIZABLE); + SDL_Window *window = SDL_CreateWindow("ImGui SDL2+OpenGL3 example", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, 1280, 720, SDL_WINDOW_OPENGL|SDL_WINDOW_RESIZABLE); SDL_GLContext glcontext = SDL_GL_CreateContext(window); + gl3wInit(); // Setup ImGui binding - ImGui_ImplSdlOgl3_Init(window); + ImGui_ImplSdlGL3_Init(window); // Load Fonts // (see extra_fonts/README.txt for more details) @@ -56,11 +57,11 @@ SDL_Event event; while (SDL_PollEvent(&event)) { - ImGui_ImplSdlOgl3_ProcessEvent(&event); + ImGui_ImplSdlGL3_ProcessEvent(&event); if (event.type == SDL_QUIT) done = true; } - ImGui_ImplSdlOgl3_NewFrame(window); + ImGui_ImplSdlGL3_NewFrame(window); // 1. Show a simple window // Tip: if we don't call ImGui::Begin()/ImGui::End() the widgets appears in a window automatically called "Debug" @@ -99,7 +100,7 @@ } // Cleanup - ImGui_ImplSdlOgl3_Shutdown(); + ImGui_ImplSdlGL3_Shutdown(); SDL_GL_DeleteContext(glcontext); SDL_DestroyWindow(window); SDL_Quit();