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.

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

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

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',
Set your working directory to EGL-Registry/api/.
Run python genheaders.py -registry egl.xml EGL/egl.h
The generated header will now be in EGL-Registry/api/EGL/egl.h. You can copy the header over to this folder.
Also update scripts/egl.xml with the latest version from EGL-Registry/api/.