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• Author : Geoff Lang
  Date : 2019-07-18 16:27:14
  Hash : 6a02f06d
  Message : Implement EGL_ANGLE_create_context_backwards_compatible This extension allows the user to specify if ANGLE should create a context of the exact requested version or a higher version context that is backwards compatible. BUG=angleproject:3425 Change-Id: I7d0b75cdd7e34a2fc888aa238e1eeb67af82ae0d Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1601560 Commit-Queue: Geoff Lang <geofflang@chromium.org> Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org>

• Files
• .clang-format
• README.md
• egl.h
• eglext.h
• eglext_angle.h
• eglplatform.h

• README.md

• ANGLE EGL Headers

  The EGL headers ANGLE uses are generated using the Khronos tools but modified to include function pointer types and function prototype guards.

  Regenerating EGL.h

  1. Install Python 3 (not 2) with the lxml addon. You can do this using pip install lxml from your Python's Scripts folder.
  2. Clone https://github.com/KhronosGroup/EGL-Registry.git.
  3. Edit EGL-Registry/api/genheaders.py and add the following under glesProtoPrefixStrings:

  eglProtoPrefixStrings = [
      '#ifndef EGL_EGL_PROTOTYPES',
      '#define EGL_EGL_PROTOTYPES 1',
      '#endif',
      ''
  ]
  

  4. Also in EGL-Registry/api/genheaders.py:

     1. Look for the section titled # EGL API - EGL/egl.h (no function pointers, yet @@@)
     2. Set prefixText to prefixStrings + eglPlatformStrings + eglProtoPrefixStrings + genDateCommentString
     3. Change genFuncPointers = False, to genFuncPointers = True,
     4. Change protectProto = False, to protectProto = 'nonzero',
     5. Change protectProtoStr = 'EGL_EGLEXT_PROTOTYPES', to protectProtoStr = 'EGL_EGL_PROTOTYPES',

  5. Set your working directory to EGL-Registry/api/.

  6. Run python genheaders.py -registry egl.xml EGL/egl.h

  7. The generated header will now be in EGL-Registry/api/EGL/egl.h. You can copy the header over to this folder.

  8. Also update scripts/egl.xml with the latest version from EGL-Registry/api/.