import * as ImGui from "../imgui";
let clipboard_text: string = "";
let canvas: HTMLCanvasElement | null = null;
export let gl: WebGLRenderingContext | null = null;
let g_ShaderHandle: WebGLProgram | null = null;
let g_VertHandle: WebGLShader | null = null;
let g_FragHandle: WebGLShader | null = null;
let g_AttribLocationTex: WebGLUniformLocation | null = null;
let g_AttribLocationProjMtx: WebGLUniformLocation | null = null;
let g_AttribLocationPosition: GLint = -1;
let g_AttribLocationUV: GLint = -1;
let g_AttribLocationColor: GLint = -1;
let g_VboHandle: WebGLBuffer | null = null;
let g_ElementsHandle: WebGLBuffer | null = null;
let g_FontTexture: WebGLTexture | null = null;
let prev_time: number = 0;
function document_on_copy(event: ClipboardEvent): void {
event.clipboardData.setData("text/plain", clipboard_text);
// console.log(`${event.type}: "${clipboard_text}"`);
event.preventDefault();
}
function document_on_cut(event: ClipboardEvent): void {
event.clipboardData.setData("text/plain", clipboard_text);
// console.log(`${event.type}: "${clipboard_text}"`);
event.preventDefault();
}
function document_on_paste(event: ClipboardEvent): void {
clipboard_text = event.clipboardData.getData("text/plain");
// console.log(`${event.type}: "${clipboard_text}"`);
event.preventDefault();
}
function window_on_resize(): void {
if (canvas !== null) {
const devicePixelRatio: number = window.devicePixelRatio || 1;
canvas.width = canvas.scrollWidth * devicePixelRatio;
canvas.height = canvas.scrollHeight * devicePixelRatio;
}
}
function window_on_gamepadconnected(event: any /* GamepadEvent */): void {
console.log("Gamepad connected at index %d: %s. %d buttons, %d axes.",
event.gamepad.index, event.gamepad.id,
event.gamepad.buttons.length, event.gamepad.axes.length);
}
function window_on_gamepaddisconnected(event: any /* GamepadEvent */): void {
console.log("Gamepad disconnected at index %d: %s.",
event.gamepad.index, event.gamepad.id);
}
function canvas_on_blur(event: FocusEvent): void {
const io = ImGui.GetIO();
io.KeyCtrl = false;
io.KeyShift = false;
io.KeyAlt = false;
io.KeySuper = false;
for (let i = 0; i < io.KeysDown.length; ++i) {
io.KeysDown[i] = false;
}
for (let i = 0; i < io.MouseDown.length; ++i) {
io.MouseDown[i] = false;
}
}
function canvas_on_keydown(event: KeyboardEvent): void {
// console.log(event.type, event.key, event.keyCode);
const io = ImGui.GetIO();
io.KeyCtrl = event.ctrlKey;
io.KeyShift = event.shiftKey;
io.KeyAlt = event.altKey;
io.KeySuper = event.metaKey;
ImGui.IM_ASSERT(event.keyCode >= 0 && event.keyCode < ImGui.IM_ARRAYSIZE(io.KeysDown));
io.KeysDown[event.keyCode] = true;
// forward to the keypress event
if (/*io.WantCaptureKeyboard ||*/ event.key === "Tab") {
event.preventDefault();
}
}
function canvas_on_keyup(event: KeyboardEvent): void {
// console.log(event.type, event.key, event.keyCode);
const io = ImGui.GetIO();
io.KeyCtrl = event.ctrlKey;
io.KeyShift = event.shiftKey;
io.KeyAlt = event.altKey;
io.KeySuper = event.metaKey;
ImGui.IM_ASSERT(event.keyCode >= 0 && event.keyCode < ImGui.IM_ARRAYSIZE(io.KeysDown));
io.KeysDown[event.keyCode] = false;
if (io.WantCaptureKeyboard) {
event.preventDefault();
}
}
function canvas_on_keypress(event: KeyboardEvent): void {
// console.log(event.type, event.key, event.keyCode);
const io = ImGui.GetIO();
io.AddInputCharacter(event.charCode);
if (io.WantCaptureKeyboard) {
event.preventDefault();
}
}
function canvas_on_pointermove(event: PointerEvent): void {
const io = ImGui.GetIO();
io.MousePos.x = event.offsetX;
io.MousePos.y = event.offsetY;
if (io.WantCaptureMouse) {
event.preventDefault();
}
}
// MouseEvent.button
// A number representing a given button:
// 0: Main button pressed, usually the left button or the un-initialized state
// 1: Auxiliary button pressed, usually the wheel button or the middle button (if present)
// 2: Secondary button pressed, usually the right button
// 3: Fourth button, typically the Browser Back button
// 4: Fifth button, typically the Browser Forward button
const mouse_button_map: number[] = [ 0, 2, 1, 3, 4 ];
function canvas_on_pointerdown(event: PointerEvent): void {
const io = ImGui.GetIO();
io.MousePos.x = event.offsetX;
io.MousePos.y = event.offsetY;
io.MouseDown[mouse_button_map[event.button]] = true;
// if (io.WantCaptureMouse) {
// event.preventDefault();
// }
}
function canvas_on_contextmenu(event: PointerEvent): void {
const io = ImGui.GetIO();
if (io.WantCaptureMouse) {
event.preventDefault();
}
}
function canvas_on_pointerup(event: PointerEvent): void {
const io = ImGui.GetIO();
io.MouseDown[mouse_button_map[event.button]] = false;
if (io.WantCaptureMouse) {
event.preventDefault();
}
}
function canvas_on_wheel(event: WheelEvent): void {
const io = ImGui.GetIO();
let scale: number = 1.0;
switch (event.deltaMode) {
case event.DOM_DELTA_PIXEL: scale = 0.01; break;
case event.DOM_DELTA_LINE: scale = 0.2; break;
case event.DOM_DELTA_PAGE: scale = 1.0; break;
}
io.MouseWheelH = event.deltaX * scale;
io.MouseWheel = -event.deltaY * scale; // Mouse wheel: 1 unit scrolls about 5 lines text.
if (io.WantCaptureMouse) {
event.preventDefault();
}
}
export function Init(value: HTMLCanvasElement | WebGLRenderingContext | null): void {
const io = ImGui.GetIO();
if (typeof(window) !== "undefined") {
ImGui.LoadIniSettingsFromMemory(window.localStorage.getItem("imgui.ini") || "");
}
if (typeof(navigator) !== "undefined") {
io.ConfigMacOSXBehaviors = navigator.platform.match(/Mac/) !== null;
}
if (typeof(document) !== "undefined") {
document.body.addEventListener("copy", document_on_copy);
document.body.addEventListener("cut", document_on_cut);
document.body.addEventListener("paste", document_on_paste);
}
io.SetClipboardTextFn = (user_data: any, text: string): void => {
clipboard_text = text;
// console.log(`set clipboard_text: "${clipboard_text}"`);
if (typeof navigator !== "undefined" && typeof (navigator as any).clipboard !== "undefined") {
// console.log(`clipboard.writeText: "${clipboard_text}"`);
(navigator as any).clipboard.writeText(clipboard_text).then((): void => {
// console.log(`clipboard.writeText: "${clipboard_text}" done.`);
});
}
};
io.GetClipboardTextFn = (user_data: any): string => {
// if (typeof navigator !== "undefined" && typeof (navigator as any).clipboard !== "undefined") {
// console.log(`clipboard.readText: "${clipboard_text}"`);
// (navigator as any).clipboard.readText().then((text: string): void => {
// clipboard_text = text;
// console.log(`clipboard.readText: "${clipboard_text}" done.`);
// });
// }
// console.log(`get clipboard_text: "${clipboard_text}"`);
return clipboard_text;
};
io.ClipboardUserData = null;
if (typeof(window) !== "undefined") {
window.addEventListener("resize", window_on_resize);
window.addEventListener("gamepadconnected", window_on_gamepadconnected);
window.addEventListener("gamepaddisconnected", window_on_gamepaddisconnected);
}
if (value && value instanceof(HTMLCanvasElement)) {
canvas = value;
gl = canvas.getContext("webgl", { alpha: false });
} else if (value && value instanceof(WebGLRenderingContext)) {
canvas = value.canvas;
gl = value;
}
if (canvas !== null) {
window_on_resize();
canvas.style.touchAction = "none"; // Disable browser handling of all panning and zooming gestures.
canvas.addEventListener("blur", canvas_on_blur);
canvas.addEventListener("keydown", canvas_on_keydown);
canvas.addEventListener("keyup", canvas_on_keyup);
canvas.addEventListener("keypress", canvas_on_keypress);
canvas.addEventListener("pointermove", canvas_on_pointermove);
canvas.addEventListener("pointerdown", canvas_on_pointerdown);
canvas.addEventListener("contextmenu", canvas_on_contextmenu);
canvas.addEventListener("pointerup", canvas_on_pointerup);
canvas.addEventListener("wheel", canvas_on_wheel);
}
// Setup back-end capabilities flags
io.BackendFlags |= ImGui.BackendFlags.HasMouseCursors; // We can honor GetMouseCursor() values (optional)
// Keyboard mapping. ImGui will use those indices to peek into the io.KeyDown[] array.
io.KeyMap[ImGui.Key.Tab] = 9;
io.KeyMap[ImGui.Key.LeftArrow] = 37;
io.KeyMap[ImGui.Key.RightArrow] = 39;
io.KeyMap[ImGui.Key.UpArrow] = 38;
io.KeyMap[ImGui.Key.DownArrow] = 40;
io.KeyMap[ImGui.Key.PageUp] = 33;
io.KeyMap[ImGui.Key.PageDown] = 34;
io.KeyMap[ImGui.Key.Home] = 36;
io.KeyMap[ImGui.Key.End] = 35;
io.KeyMap[ImGui.Key.Insert] = 45;
io.KeyMap[ImGui.Key.Delete] = 46;
io.KeyMap[ImGui.Key.Backspace] = 8;
io.KeyMap[ImGui.Key.Space] = 32;
io.KeyMap[ImGui.Key.Enter] = 13;
io.KeyMap[ImGui.Key.Escape] = 27;
io.KeyMap[ImGui.Key.A] = 65;
io.KeyMap[ImGui.Key.C] = 67;
io.KeyMap[ImGui.Key.V] = 86;
io.KeyMap[ImGui.Key.X] = 88;
io.KeyMap[ImGui.Key.Y] = 89;
io.KeyMap[ImGui.Key.Z] = 90;
CreateDeviceObjects();
}
export function Shutdown(): void {
DestroyDeviceObjects();
if (canvas !== null) {
canvas.removeEventListener("blur", canvas_on_blur);
canvas.removeEventListener("keydown", canvas_on_keydown);
canvas.removeEventListener("keyup", canvas_on_keyup);
canvas.removeEventListener("keypress", canvas_on_keypress);
canvas.removeEventListener("pointermove", canvas_on_pointermove);
canvas.removeEventListener("pointerdown", canvas_on_pointerdown);
canvas.removeEventListener("contextmenu", canvas_on_contextmenu);
canvas.removeEventListener("pointerup", canvas_on_pointerup);
canvas.removeEventListener("wheel", canvas_on_wheel);
}
gl = null;
canvas = null;
if (typeof(window) !== "undefined") {
window.removeEventListener("resize", window_on_resize);
window.removeEventListener("gamepadconnected", window_on_gamepadconnected);
window.removeEventListener("gamepaddisconnected", window_on_gamepaddisconnected);
}
if (typeof(document) !== "undefined") {
document.body.removeEventListener("copy", document_on_copy);
document.body.removeEventListener("cut", document_on_cut);
document.body.removeEventListener("paste", document_on_paste);
}
}
export function NewFrame(time: number): void {
const io = ImGui.GetIO();
if (io.WantSaveIniSettings) {
io.WantSaveIniSettings = false;
if (typeof(window) !== "undefined") {
window.localStorage.setItem("imgui.ini", ImGui.SaveIniSettingsToMemory());
}
}
const w: number = gl && gl.canvas.scrollWidth || 640;
const h: number = gl && gl.canvas.scrollHeight || 480;
const display_w: number = gl && gl.drawingBufferWidth || w;
const display_h: number = gl && gl.drawingBufferHeight || h;
io.DisplaySize.x = w;
io.DisplaySize.y = h;
io.DisplayFramebufferScale.x = w > 0 ? (display_w / w) : 0;
io.DisplayFramebufferScale.y = h > 0 ? (display_h / h) : 0;
const dt: number = time - prev_time;
prev_time = time;
io.DeltaTime = dt / 1000;
if (io.WantSetMousePos) {
console.log("TODO: MousePos", io.MousePos.x, io.MousePos.y);
}
if (typeof(document) !== "undefined") {
if (io.MouseDrawCursor) {
document.body.style.cursor = "none";
} else {
switch (ImGui.GetMouseCursor()) {
case ImGui.MouseCursor.None: document.body.style.cursor = "none"; break;
default: case ImGui.MouseCursor.Arrow: document.body.style.cursor = "default"; break;
case ImGui.MouseCursor.TextInput: document.body.style.cursor = "text"; break; // When hovering over InputText, etc.
case ImGui.MouseCursor.ResizeAll: document.body.style.cursor = "move"; break; // Unused
case ImGui.MouseCursor.ResizeNS: document.body.style.cursor = "ns-resize"; break; // When hovering over an horizontal border
case ImGui.MouseCursor.ResizeEW: document.body.style.cursor = "ew-resize"; break; // When hovering over a vertical border or a column
case ImGui.MouseCursor.ResizeNESW: document.body.style.cursor = "nesw-resize"; break; // When hovering over the bottom-left corner of a window
case ImGui.MouseCursor.ResizeNWSE: document.body.style.cursor = "nwse-resize"; break; // When hovering over the bottom-right corner of a window
case ImGui.MouseCursor.Hand: document.body.style.cursor = "move"; break;
}
}
}
// Gamepad navigation mapping [BETA]
for (let i = 0; i < io.NavInputs.length; ++i) {
io.NavInputs[i] = 0.0;
}
if (io.ConfigFlags & ImGui.ConfigFlags.NavEnableGamepad) {
// Update gamepad inputs
const gamepads: (Gamepad | null)[] = (typeof(navigator) !== "undefined" && typeof(navigator.getGamepads) === "function") ? navigator.getGamepads() : [];
for (let i = 0; i < gamepads.length; ++i) {
const gamepad: Gamepad | null = gamepads[i];
if (!gamepad) { continue; }
const buttons_count: number = gamepad.buttons.length;
const axes_count: number = gamepad.axes.length;
function MAP_BUTTON(NAV_NO: number, BUTTON_NO: number): void {
if (!gamepad) { return; }
if (buttons_count > BUTTON_NO && gamepad.buttons[BUTTON_NO].pressed)
io.NavInputs[NAV_NO] = 1.0;
}
function MAP_ANALOG(NAV_NO: number, AXIS_NO: number, V0: number, V1: number): void {
if (!gamepad) { return; }
let v: number = (axes_count > AXIS_NO) ? gamepad.axes[AXIS_NO] : V0;
v = (v - V0) / (V1 - V0);
if (v > 1.0) v = 1.0;
if (io.NavInputs[NAV_NO] < v) io.NavInputs[NAV_NO] = v;
}
// TODO: map input based on vendor and product id
// https://developer.mozilla.org/en-US/docs/Web/API/Gamepad/id
const match: RegExpMatchArray | null = gamepad.id.match(/^([0-9a-f]{4})-([0-9a-f]{4})-.*$/);
const match_chrome: RegExpMatchArray | null = gamepad.id.match(/^.*\(.*Vendor: ([0-9a-f]{4}) Product: ([0-9a-f]{4})\).*$/);
const vendor: string = (match && match[1]) || (match_chrome && match_chrome[1]) || "0000";
const product: string = (match && match[2]) || (match_chrome && match_chrome[2]) || "0000";
switch (vendor + product) {
case "046dc216": // Logitech Logitech Dual Action (Vendor: 046d Product: c216)
MAP_BUTTON(ImGui.NavInput.Activate, 1); // Cross / A
MAP_BUTTON(ImGui.NavInput.Cancel, 2); // Circle / B
MAP_BUTTON(ImGui.NavInput.Menu, 0); // Square / X
MAP_BUTTON(ImGui.NavInput.Input, 3); // Triangle / Y
MAP_ANALOG(ImGui.NavInput.DpadLeft, 4, -0.3, -0.9); // D-Pad Left
MAP_ANALOG(ImGui.NavInput.DpadRight, 4, +0.3, +0.9); // D-Pad Right
MAP_ANALOG(ImGui.NavInput.DpadUp, 5, -0.3, -0.9); // D-Pad Up
MAP_ANALOG(ImGui.NavInput.DpadDown, 5, +0.3, +0.9); // D-Pad Down
MAP_BUTTON(ImGui.NavInput.FocusPrev, 4); // L1 / LB
MAP_BUTTON(ImGui.NavInput.FocusNext, 5); // R1 / RB
MAP_BUTTON(ImGui.NavInput.TweakSlow, 6); // L2 / LT
MAP_BUTTON(ImGui.NavInput.TweakFast, 7); // R2 / RT
MAP_ANALOG(ImGui.NavInput.LStickLeft, 0, -0.3, -0.9);
MAP_ANALOG(ImGui.NavInput.LStickRight, 0, +0.3, +0.9);
MAP_ANALOG(ImGui.NavInput.LStickUp, 1, -0.3, -0.9);
MAP_ANALOG(ImGui.NavInput.LStickDown, 1, +0.3, +0.9);
break;
case "046dc21d": // Logitech Gamepad F310 (STANDARD GAMEPAD Vendor: 046d Product: c21d)
MAP_BUTTON(ImGui.NavInput.Activate, 0); // Cross / A
MAP_BUTTON(ImGui.NavInput.Cancel, 1); // Circle / B
MAP_BUTTON(ImGui.NavInput.Menu, 2); // Square / X
MAP_BUTTON(ImGui.NavInput.Input, 3); // Triangle / Y
MAP_BUTTON(ImGui.NavInput.DpadLeft, 14); // D-Pad Left
MAP_BUTTON(ImGui.NavInput.DpadRight, 15); // D-Pad Right
MAP_BUTTON(ImGui.NavInput.DpadUp, 12); // D-Pad Up
MAP_BUTTON(ImGui.NavInput.DpadDown, 13); // D-Pad Down
MAP_BUTTON(ImGui.NavInput.FocusPrev, 4); // L1 / LB
MAP_BUTTON(ImGui.NavInput.FocusNext, 5); // R1 / RB
MAP_ANALOG(ImGui.NavInput.TweakSlow, 6, +0.3, +0.9); // L2 / LT
MAP_ANALOG(ImGui.NavInput.TweakFast, 7, +0.3, +0.9); // R2 / RT
MAP_ANALOG(ImGui.NavInput.LStickLeft, 0, -0.3, -0.9);
MAP_ANALOG(ImGui.NavInput.LStickRight, 0, +0.3, +0.9);
MAP_ANALOG(ImGui.NavInput.LStickUp, 1, -0.3, -0.9);
MAP_ANALOG(ImGui.NavInput.LStickDown, 1, +0.3, +0.9);
break;
case "2dc86001": // 8Bitdo SN30 Pro 8Bitdo SN30 Pro (Vendor: 2dc8 Product: 6001)
case "2dc86101": // 8Bitdo SN30 Pro (Vendor: 2dc8 Product: 6101)
MAP_BUTTON(ImGui.NavInput.Activate, 1); // Cross / A
MAP_BUTTON(ImGui.NavInput.Cancel, 0); // Circle / B
MAP_BUTTON(ImGui.NavInput.Menu, 4); // Square / X
MAP_BUTTON(ImGui.NavInput.Input, 3); // Triangle / Y
MAP_ANALOG(ImGui.NavInput.DpadLeft, 6, -0.3, -0.9); // D-Pad Left
MAP_ANALOG(ImGui.NavInput.DpadRight, 6, +0.3, +0.9); // D-Pad Right
MAP_ANALOG(ImGui.NavInput.DpadUp, 7, -0.3, -0.9); // D-Pad Up
MAP_ANALOG(ImGui.NavInput.DpadDown, 7, +0.3, +0.9); // D-Pad Down
MAP_BUTTON(ImGui.NavInput.FocusPrev, 6); // L1 / LB
MAP_BUTTON(ImGui.NavInput.FocusNext, 7); // R1 / RB
MAP_BUTTON(ImGui.NavInput.TweakSlow, 8); // L2 / LT
MAP_BUTTON(ImGui.NavInput.TweakFast, 9); // R2 / RT
MAP_ANALOG(ImGui.NavInput.LStickLeft, 0, -0.3, -0.9);
MAP_ANALOG(ImGui.NavInput.LStickRight, 0, +0.3, +0.9);
MAP_ANALOG(ImGui.NavInput.LStickUp, 1, -0.3, -0.9);
MAP_ANALOG(ImGui.NavInput.LStickDown, 1, +0.3, +0.9);
break;
default: // standard gamepad: https://w3c.github.io/gamepad/#remapping
MAP_BUTTON(ImGui.NavInput.Activate, 0); // Cross / A
MAP_BUTTON(ImGui.NavInput.Cancel, 1); // Circle / B
MAP_BUTTON(ImGui.NavInput.Menu, 2); // Square / X
MAP_BUTTON(ImGui.NavInput.Input, 3); // Triangle / Y
MAP_BUTTON(ImGui.NavInput.DpadLeft, 14); // D-Pad Left
MAP_BUTTON(ImGui.NavInput.DpadRight, 15); // D-Pad Right
MAP_BUTTON(ImGui.NavInput.DpadUp, 12); // D-Pad Up
MAP_BUTTON(ImGui.NavInput.DpadDown, 13); // D-Pad Down
MAP_BUTTON(ImGui.NavInput.FocusPrev, 4); // L1 / LB
MAP_BUTTON(ImGui.NavInput.FocusNext, 5); // R1 / RB
MAP_BUTTON(ImGui.NavInput.TweakSlow, 6); // L2 / LT
MAP_BUTTON(ImGui.NavInput.TweakFast, 7); // R2 / RT
MAP_ANALOG(ImGui.NavInput.LStickLeft, 0, -0.3, -0.9);
MAP_ANALOG(ImGui.NavInput.LStickRight, 0, +0.3, +0.9);
MAP_ANALOG(ImGui.NavInput.LStickUp, 1, -0.3, -0.9);
MAP_ANALOG(ImGui.NavInput.LStickDown, 1, +0.3, +0.9);
break;
}
}
}
}
export function RenderDrawData(draw_data: ImGui.ImDrawData | null = ImGui.GetDrawData()): void {
const io = ImGui.GetIO();
if (draw_data === null) { throw new Error(); }
gl || console.log(draw_data);
// Avoid rendering when minimized, scale coordinates for retina displays (screen coordinates != framebuffer coordinates)
const fb_width: number = io.DisplaySize.x * io.DisplayFramebufferScale.x;
const fb_height: number = io.DisplaySize.y * io.DisplayFramebufferScale.y;
if (fb_width === 0 || fb_height === 0) {
return;
}
draw_data.ScaleClipRects(io.DisplayFramebufferScale);
// Backup GL state
const last_active_texture: GLenum | null = gl && gl.getParameter(gl.ACTIVE_TEXTURE) || null;
gl && gl.activeTexture(gl.TEXTURE0);
const last_program: WebGLProgram | null = gl && gl.getParameter(gl.CURRENT_PROGRAM) || null;
const last_texture: WebGLTexture | null = gl && gl.getParameter(gl.TEXTURE_BINDING_2D) || null;
const last_array_buffer: WebGLBuffer | null = gl && gl.getParameter(gl.ARRAY_BUFFER_BINDING) || null;
const last_element_array_buffer: WebGLBuffer | null = gl && gl.getParameter(gl.ELEMENT_ARRAY_BUFFER_BINDING) || null;
// GLint last_polygon_mode[2]; glGetIntegerv(GL_POLYGON_MODE, last_polygon_mode);
const last_viewport: Int32Array | null = gl && gl.getParameter(gl.VIEWPORT) || null;
const last_scissor_box: Int32Array | null = gl && gl.getParameter(gl.SCISSOR_BOX) || null;
const last_blend_src_rgb: GLenum | null = gl && gl.getParameter(gl.BLEND_SRC_RGB) || null;
const last_blend_dst_rgb: GLenum | null = gl && gl.getParameter(gl.BLEND_DST_RGB) || null;
const last_blend_src_alpha: GLenum | null = gl && gl.getParameter(gl.BLEND_SRC_ALPHA) || null;
const last_blend_dst_alpha: GLenum | null = gl && gl.getParameter(gl.BLEND_DST_ALPHA) || null;
const last_blend_equation_rgb: GLenum | null = gl && gl.getParameter(gl.BLEND_EQUATION_RGB) || null;
const last_blend_equation_alpha: GLenum | null = gl && gl.getParameter(gl.BLEND_EQUATION_ALPHA) || null;
const last_enable_blend: GLboolean | null = gl && gl.getParameter(gl.BLEND) || null;
const last_enable_cull_face: GLboolean | null = gl && gl.getParameter(gl.CULL_FACE) || null;
const last_enable_depth_test: GLboolean | null = gl && gl.getParameter(gl.DEPTH_TEST) || null;
const last_enable_scissor_test: GLboolean | null = gl && gl.getParameter(gl.SCISSOR_TEST) || null;
// Setup render state: alpha-blending enabled, no face culling, no depth testing, scissor enabled, polygon fill
gl && gl.enable(gl.BLEND);
gl && gl.blendEquation(gl.FUNC_ADD);
gl && gl.blendFunc(gl.SRC_ALPHA, gl.ONE_MINUS_SRC_ALPHA);
gl && gl.disable(gl.CULL_FACE);
gl && gl.disable(gl.DEPTH_TEST);
gl && gl.enable(gl.SCISSOR_TEST);
// glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
// Setup viewport, orthographic projection matrix
// Our visible imgui space lies from draw_data->DisplayPps (top left) to draw_data->DisplayPos+data_data->DisplaySize (bottom right). DisplayMin is typically (0,0) for single viewport apps.
gl && gl.viewport(0, 0, fb_width, fb_height);
const L: number = draw_data.DisplayPos.x;
const R: number = draw_data.DisplayPos.x + draw_data.DisplaySize.x;
const T: number = draw_data.DisplayPos.y;
const B: number = draw_data.DisplayPos.y + draw_data.DisplaySize.y;
const ortho_projection: Float32Array = new Float32Array([
2.0 / (R - L), 0.0, 0.0, 0.0,
0.0, 2.0 / (T - B), 0.0, 0.0,
0.0, 0.0, -1.0, 0.0,
(R + L) / (L - R), (T + B) / (B - T), 0.0, 1.0,
]);
gl && gl.useProgram(g_ShaderHandle);
gl && gl.uniform1i(g_AttribLocationTex, 0);
gl && g_AttribLocationProjMtx && gl.uniformMatrix4fv(g_AttribLocationProjMtx, false, ortho_projection);
// Render command lists
gl && gl.bindBuffer(gl.ARRAY_BUFFER, g_VboHandle);
gl && gl.enableVertexAttribArray(g_AttribLocationPosition);
gl && gl.enableVertexAttribArray(g_AttribLocationUV);
gl && gl.enableVertexAttribArray(g_AttribLocationColor);
gl && gl.vertexAttribPointer(g_AttribLocationPosition, 2, gl.FLOAT, false, ImGui.ImDrawVertSize, ImGui.ImDrawVertPosOffset);
gl && gl.vertexAttribPointer(g_AttribLocationUV, 2, gl.FLOAT, false, ImGui.ImDrawVertSize, ImGui.ImDrawVertUVOffset);
gl && gl.vertexAttribPointer(g_AttribLocationColor, 4, gl.UNSIGNED_BYTE, true, ImGui.ImDrawVertSize, ImGui.ImDrawVertColOffset);
// Draw
const pos = draw_data.DisplayPos;
const idx_buffer_type: GLenum = gl && ((ImGui.ImDrawIdxSize === 4) ? gl.UNSIGNED_INT : gl.UNSIGNED_SHORT) || 0;
draw_data.IterateDrawLists((draw_list: ImGui.ImDrawList): void => {
gl || console.log(draw_list);
gl || console.log("VtxBuffer.length", draw_list.VtxBuffer.length);
gl || console.log("IdxBuffer.length", draw_list.IdxBuffer.length);
let idx_buffer_offset: number = 0;
gl && gl.bindBuffer(gl.ARRAY_BUFFER, g_VboHandle);
gl && gl.bufferData(gl.ARRAY_BUFFER, draw_list.VtxBuffer, gl.STREAM_DRAW);
gl && gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, g_ElementsHandle);
gl && gl.bufferData(gl.ELEMENT_ARRAY_BUFFER, draw_list.IdxBuffer, gl.STREAM_DRAW);
draw_list.IterateDrawCmds((draw_cmd: ImGui.ImDrawCmd): void => {
gl || console.log(draw_cmd);
gl || console.log("ElemCount", draw_cmd.ElemCount);
gl || console.log("ClipRect", draw_cmd.ClipRect.x, fb_height - draw_cmd.ClipRect.w, draw_cmd.ClipRect.z - draw_cmd.ClipRect.x, draw_cmd.ClipRect.w - draw_cmd.ClipRect.y);
gl || console.log("TextureId", draw_cmd.TextureId);
if (!gl) {
console.log("i: pos.x pos.y uv.x uv.y col");
for (let i = 0; i < Math.min(3, draw_cmd.ElemCount); ++i) {
const view: ImGui.ImDrawVert = new ImGui.ImDrawVert(draw_list.VtxBuffer.buffer, draw_list.VtxBuffer.byteOffset + i * ImGui.ImDrawVertSize);
console.log(`${i}: ${view.pos[0].toFixed(2)} ${view.pos[1].toFixed(2)} ${view.uv[0].toFixed(5)} ${view.uv[1].toFixed(5)} ${("00000000" + view.col[0].toString(16)).substr(-8)}`);
}
}
if (draw_cmd.UserCallback !== null) {
// User callback (registered via ImDrawList::AddCallback)
draw_cmd.UserCallback(draw_list, draw_cmd);
} else {
const clip_rect = new ImGui.ImVec4(draw_cmd.ClipRect.x - pos.x, draw_cmd.ClipRect.y - pos.y, draw_cmd.ClipRect.z - pos.x, draw_cmd.ClipRect.w - pos.y);
if (clip_rect.x < fb_width && clip_rect.y < fb_height && clip_rect.z >= 0.0 && clip_rect.w >= 0.0) {
// Apply scissor/clipping rectangle
gl && gl.scissor(clip_rect.x, fb_height - clip_rect.w, clip_rect.z - clip_rect.x, clip_rect.w - clip_rect.y);
// Bind texture, Draw
gl && gl.bindTexture(gl.TEXTURE_2D, draw_cmd.TextureId);
gl && gl.drawElements(gl.TRIANGLES, draw_cmd.ElemCount, idx_buffer_type, idx_buffer_offset);
}
}
idx_buffer_offset += draw_cmd.ElemCount * ImGui.ImDrawIdxSize;
});
});
// Restore modified GL state
gl && (last_program !== null) && gl.useProgram(last_program);
gl && (last_texture !== null) && gl.bindTexture(gl.TEXTURE_2D, last_texture);
gl && (last_active_texture !== null) && gl.activeTexture(last_active_texture);
gl && gl.disableVertexAttribArray(g_AttribLocationPosition);
gl && gl.disableVertexAttribArray(g_AttribLocationUV);
gl && gl.disableVertexAttribArray(g_AttribLocationColor);
gl && (last_array_buffer !== null) && gl.bindBuffer(gl.ARRAY_BUFFER, last_array_buffer);
gl && (last_element_array_buffer !== null) && gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, last_element_array_buffer);
gl && (last_blend_equation_rgb !== null && last_blend_equation_alpha !== null) && gl.blendEquationSeparate(last_blend_equation_rgb, last_blend_equation_alpha);
gl && (last_blend_src_rgb !== null && last_blend_src_alpha !== null && last_blend_dst_rgb !== null && last_blend_dst_alpha !== null) && gl.blendFuncSeparate(last_blend_src_rgb, last_blend_src_alpha, last_blend_dst_rgb, last_blend_dst_alpha);
gl && (last_enable_blend ? gl.enable(gl.BLEND) : gl.disable(gl.BLEND));
gl && (last_enable_cull_face ? gl.enable(gl.CULL_FACE) : gl.disable(gl.CULL_FACE));
gl && (last_enable_depth_test ? gl.enable(gl.DEPTH_TEST) : gl.disable(gl.DEPTH_TEST));
gl && (last_enable_scissor_test ? gl.enable(gl.SCISSOR_TEST) : gl.disable(gl.SCISSOR_TEST));
// glPolygonMode(GL_FRONT_AND_BACK, (GLenum)last_polygon_mode[0]);
gl && (last_viewport !== null) && gl.viewport(last_viewport[0], last_viewport[1], last_viewport[2], last_viewport[3]);
gl && (last_scissor_box !== null) && gl.scissor(last_scissor_box[0], last_scissor_box[1], last_scissor_box[2], last_scissor_box[3]);
}
export function CreateFontsTexture(): void {
const io = ImGui.GetIO();
// Backup GL state
const last_texture: WebGLTexture | null = gl && gl.getParameter(gl.TEXTURE_BINDING_2D);
// Build texture atlas
// const width: number = 256;
// const height: number = 256;
// const pixels: Uint8Array = new Uint8Array(4 * width * height).fill(0xff);
const { width, height, pixels } = io.Fonts.GetTexDataAsRGBA32(); // Load as RGBA 32-bits (75% of the memory is wasted, but default font is so small) because it is more likely to be compatible with user's existing shaders. If your ImTextureId represent a higher-level concept than just a GL texture id, consider calling GetTexDataAsAlpha8() instead to save on GPU memory.
// console.log(`font texture ${width} x ${height} @ ${pixels.length}`);
// Upload texture to graphics system
g_FontTexture = gl && gl.createTexture();
gl && gl.bindTexture(gl.TEXTURE_2D, g_FontTexture);
gl && gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR);
gl && gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.LINEAR);
// gl && gl.pixelStorei(gl.UNPACK_ROW_LENGTH); // WebGL2
gl && gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, width, height, 0, gl.RGBA, gl.UNSIGNED_BYTE, pixels);
// Store our identifier
io.Fonts.TexID = g_FontTexture || { foo: "bar" };
// console.log("font texture id", g_FontTexture);
// Restore modified GL state
gl && last_texture && gl.bindTexture(gl.TEXTURE_2D, last_texture);
}
export function DestroyFontsTexture(): void {
const io = ImGui.GetIO();
io.Fonts.TexID = null;
gl && gl.deleteTexture(g_FontTexture); g_FontTexture = null;
}
export function CreateDeviceObjects(): void {
const vertex_shader: string[] = [
"uniform mat4 ProjMtx;",
"attribute vec2 Position;",
"attribute vec2 UV;",
"attribute vec4 Color;",
"varying vec2 Frag_UV;",
"varying vec4 Frag_Color;",
"void main() {",
" Frag_UV = UV;",
" Frag_Color = Color;",
" gl_Position = ProjMtx * vec4(Position.xy,0,1);",
"}",
];
const fragment_shader: string[] = [
"precision mediump float;", // WebGL requires precision specifiers
"uniform sampler2D Texture;",
"varying vec2 Frag_UV;",
"varying vec4 Frag_Color;",
"void main() {",
" gl_FragColor = Frag_Color * texture2D(Texture, Frag_UV);",
"}",
];
g_ShaderHandle = gl && gl.createProgram();
g_VertHandle = gl && gl.createShader(gl.VERTEX_SHADER);
g_FragHandle = gl && gl.createShader(gl.FRAGMENT_SHADER);
gl && gl.shaderSource(g_VertHandle, vertex_shader.join("\n"));
gl && gl.shaderSource(g_FragHandle, fragment_shader.join("\n"));
gl && gl.compileShader(g_VertHandle);
gl && gl.compileShader(g_FragHandle);
gl && gl.attachShader(g_ShaderHandle, g_VertHandle);
gl && gl.attachShader(g_ShaderHandle, g_FragHandle);
gl && gl.linkProgram(g_ShaderHandle);
g_AttribLocationTex = gl && gl.getUniformLocation(g_ShaderHandle, "Texture");
g_AttribLocationProjMtx = gl && gl.getUniformLocation(g_ShaderHandle, "ProjMtx");
g_AttribLocationPosition = gl && gl.getAttribLocation(g_ShaderHandle, "Position") || 0;
g_AttribLocationUV = gl && gl.getAttribLocation(g_ShaderHandle, "UV") || 0;
g_AttribLocationColor = gl && gl.getAttribLocation(g_ShaderHandle, "Color") || 0;
g_VboHandle = gl && gl.createBuffer();
g_ElementsHandle = gl && gl.createBuffer();
CreateFontsTexture();
}
export function DestroyDeviceObjects(): void {
DestroyFontsTexture();
gl && gl.deleteBuffer(g_VboHandle); g_VboHandle = null;
gl && gl.deleteBuffer(g_ElementsHandle); g_ElementsHandle = null;
g_AttribLocationTex = null;
g_AttribLocationProjMtx = null;
g_AttribLocationPosition = -1;
g_AttribLocationUV = -1;
g_AttribLocationColor = -1;
gl && gl.deleteProgram(g_ShaderHandle); g_ShaderHandle = null;
gl && gl.deleteShader(g_VertHandle); g_VertHandle = null;
gl && gl.deleteShader(g_FragHandle); g_FragHandle = null;
}
