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| ================================================================================ | ||
| Simple DirectMedia Layer for Windows | ||
| ================================================================================ | ||
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| ================================================================================ | ||
| OpenGL ES 2.x support | ||
| ================================================================================ | ||
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| SDL has support for OpenGL ES 2.x under Windows via two alternative | ||
| implementations. | ||
| The most straightforward method consists in running your app in a system with | ||
| a graphic card paired with a relatively recent (as of November of 2013) driver | ||
| which supports the WGL_EXT_create_context_es2_profile extension. Vendors known | ||
| to ship said extension on Windows currently include nVidia and Intel. | ||
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| The other method involves using the ANGLE library (https://code.google.com/p/angleproject/) | ||
| If an OpenGL ES 2.x context is requested and no WGL_EXT_create_context_es2_profile | ||
| extension is found, SDL will try to load the libEGL.dll library provided by | ||
| ANGLE. | ||
| To obtain the ANGLE binaries, you can either compile from source from | ||
| https://chromium.googlesource.com/angle/angle or copy the relevant binaries from | ||
| a recent Chrome/Chromium install for Windows. The files you need are: | ||
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| * libEGL.dll | ||
| * libGLESv2.dll | ||
| * d3dcompiler_46.dll (supports Windows Vista or later, better shader compiler) | ||
| or... | ||
| * d3dcompiler_43.dll (supports Windows XP or later) | ||
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| If you compile ANGLE from source, you can configure it so it does not need the | ||
| d3dcompiler_* DLL at all (for details on this, see their documentation). | ||
| However, by default SDL will try to preload the d3dcompiler_46.dll to | ||
| comply with ANGLE's requirements. If you wish SDL to preload d3dcompiler_43.dll (to | ||
| support Windows XP) or to skip this step at all, you can use the | ||
| SDL_VIDEO_WIN_D3DCOMPILER hint (see SDL_hints.h for more details). | ||
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| Known Bugs: | ||
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| * SDL_GL_SetSwapInterval is currently a no op when using ANGLE. It appears | ||
| that there's a bug in the library which prevents the window contents from | ||
| refreshing if this is set to anything other than the default value. | ||
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