docs/README-windows.md
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     1 Windows
       
     2 ================================================================================
       
     3 
       
     4 ================================================================================
       
     5 OpenGL ES 2.x support
       
     6 ================================================================================
       
     7 
       
     8 SDL has support for OpenGL ES 2.x under Windows via two alternative 
       
     9 implementations. 
       
    10 The most straightforward method consists in running your app in a system with 
       
    11 a graphic card paired with a relatively recent (as of November of 2013) driver 
       
    12 which supports the WGL_EXT_create_context_es2_profile extension. Vendors known 
       
    13 to ship said extension on Windows currently include nVidia and Intel.
       
    14 
       
    15 The other method involves using the ANGLE library (https://code.google.com/p/angleproject/)
       
    16 If an OpenGL ES 2.x context is requested and no WGL_EXT_create_context_es2_profile
       
    17 extension is found, SDL will try to load the libEGL.dll library provided by
       
    18 ANGLE.
       
    19 To obtain the ANGLE binaries, you can either compile from source from
       
    20 https://chromium.googlesource.com/angle/angle or copy the relevant binaries from
       
    21 a recent Chrome/Chromium install for Windows. The files you need are:
       
    22     
       
    23     * libEGL.dll
       
    24     * libGLESv2.dll
       
    25     * d3dcompiler_46.dll (supports Windows Vista or later, better shader compiler)
       
    26     or...
       
    27     * d3dcompiler_43.dll (supports Windows XP or later)
       
    28     
       
    29 If you compile ANGLE from source, you can configure it so it does not need the
       
    30 d3dcompiler_* DLL at all (for details on this, see their documentation). 
       
    31 However, by default SDL will try to preload the d3dcompiler_46.dll to
       
    32 comply with ANGLE's requirements. If you wish SDL to preload d3dcompiler_43.dll (to
       
    33 support Windows XP) or to skip this step at all, you can use the 
       
    34 SDL_HINT_VIDEO_WIN_D3DCOMPILER hint (see SDL_hints.h for more details).
       
    35 
       
    36 Known Bugs:
       
    37     
       
    38     * SDL_GL_SetSwapInterval is currently a no op when using ANGLE. It appears
       
    39       that there's a bug in the library which prevents the window contents from
       
    40       refreshing if this is set to anything other than the default value.
       
    41