gabomdq@9023: Windows
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gabomdq@9023: 
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gabomdq@9023: OpenGL ES 2.x support
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gabomdq@9023: 
gabomdq@9023: SDL has support for OpenGL ES 2.x under Windows via two alternative 
gabomdq@9023: implementations. 
gabomdq@9023: The most straightforward method consists in running your app in a system with 
gabomdq@9023: a graphic card paired with a relatively recent (as of November of 2013) driver 
gabomdq@9023: which supports the WGL_EXT_create_context_es2_profile extension. Vendors known 
gabomdq@9023: to ship said extension on Windows currently include nVidia and Intel.
gabomdq@9023: 
gabomdq@9023: The other method involves using the ANGLE library (https://code.google.com/p/angleproject/)
gabomdq@9023: If an OpenGL ES 2.x context is requested and no WGL_EXT_create_context_es2_profile
gabomdq@9023: extension is found, SDL will try to load the libEGL.dll library provided by
gabomdq@9023: ANGLE.
gabomdq@9023: To obtain the ANGLE binaries, you can either compile from source from
gabomdq@9023: https://chromium.googlesource.com/angle/angle or copy the relevant binaries from
gabomdq@9023: a recent Chrome/Chromium install for Windows. The files you need are:
gabomdq@9023:     
gabomdq@9023:     * libEGL.dll
gabomdq@9023:     * libGLESv2.dll
gabomdq@9023:     * d3dcompiler_46.dll (supports Windows Vista or later, better shader compiler)
gabomdq@9023:     or...
gabomdq@9023:     * d3dcompiler_43.dll (supports Windows XP or later)
gabomdq@9023:     
gabomdq@9023: If you compile ANGLE from source, you can configure it so it does not need the
gabomdq@9023: d3dcompiler_* DLL at all (for details on this, see their documentation). 
gabomdq@9023: However, by default SDL will try to preload the d3dcompiler_46.dll to
gabomdq@9023: comply with ANGLE's requirements. If you wish SDL to preload d3dcompiler_43.dll (to
gabomdq@9023: support Windows XP) or to skip this step at all, you can use the 
gabomdq@9023: SDL_HINT_VIDEO_WIN_D3DCOMPILER hint (see SDL_hints.h for more details).
gabomdq@9023: 
gabomdq@9023: Known Bugs:
gabomdq@9023:     
gabomdq@9023:     * SDL_GL_SetSwapInterval is currently a no op when using ANGLE. It appears
gabomdq@9023:       that there's a bug in the library which prevents the window contents from
gabomdq@9023:       refreshing if this is set to anything other than the default value.
gabomdq@9023: