Allow DX11 renderer to be used with devices with lower feature levels.

Examples: DirectX9/11: Removed assumption about Unicode build in example main.cpp (#399)

Examples: OpenGL3: Fixed gl3w.c for Linux when compiled with C++ compiler (#411)

Examples: SDL/OpenGL3: Added -ldl to Linux command-line (#411)

Examples: Updated README

Examples: SDL+OpenGL3: Fixed readme (#356)

Examples: SDL+OpenGL3: Various fixes to example to make it matches current GL3 example (#356)

Examples: SDL+OpenGL3: Using glew like existing example + renaming (#356)

Tweak build batch files and readmes

Merge branch 'SDL_OpenGL3_Implementation' of https://github.com/zach2good/imgui into zach2good-SDL_OpenGL3_Implementation

Moving stdlib.h include outside of imgui.h (#405)

Examples: Added /Zi (output debug information) in build_win32.bat files

Examples: OpenGL3: Implement ImGui_ImplGlfwGL3_InvalidateDeviceObjects() like other examples.

Examples: Most examples apps detect if ImDrawIdx was changed to 32-bits instead of 16

Tabs to spaces

Examples: OpenGL2/3: Save/setup/restore viewport as part of render function. Update SDL example to match GL2 one. (fix #392)

Examples: update all examples with same comment (#389)

Font merge demo and documentation minor additions. ...

Clarifies the lifetime requirements for the ranges parameter for AddFont* functions.

NULL out font texture on invalidate ...

If this isn't done, NewFrame won't re-create the font.

Example: Marmalade: shallow tweaks and cleanups to match ImGui coding style (#375)

no message

no message

Merge branch 'master' of https://github.com/ocornut/imgui

Examples: Possibly clarified the intent of imgui_impl_* files.

fix POSITION format (ImDrawVert::pos is 2D, not 4D) ...

the inputlayout incorrectly described the POSITION attribute as being
4D, while ImDrawVert::pos is 2D. This went unnoticed because the buffer
binding has a stride of sizeof(ImDrawVert) and the POSITION is treated
as a float2 in the vertex shader. If you switch POSITION to float4 in
the vertex shader (and actually use the z/w in the matrix
multiplication) then everything become wacky-looking since it's
interpreting the texture coordinates as z/w. On a similar note: It's
weird that the projection matrix takes z and w into consideration when
those don't exist in the shader due to positions being float2s.

Added example for the Marmalade platform

Examples: OpenGL2: Add msys2/mingw64 target (#361)

add msys2/mingw64 target

Previous SDL implementation didn't work with my OpenGL 3.3 project, spliced the GLFW OpenGL examples on top of the SDL example to create an option that works for me. Could be useful for others.

Examples: OpenGL3: saving more of blend state (#347)