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# ANGLE GLES 1.0 Headers
The GLES 1.0 headers ANGLE uses are generated using the Khronos tools but modified to include function pointer types and function prototype guards.
### Regenerating gl.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.
1. Clone [https://github.com/KhronosGroup/OpenGL-Registry.git](https://github.com/KhronosGroup/OpenGL-Registry.git).
1. Edit `OpenGL-Registry/xml/genheaders.py`:
1. Look for the section titled `# GLES 1.x API + mandatory extensions - GLES/gl.h (no function pointers)`
1. Change `prefixText = prefixStrings + gles1PlatformStrings + genDateCommentString,` to `prefixText = prefixStrings + gles1PlatformStrings + apiEntryPrefixStrings + genDateCommentString,`
1. Change `genFuncPointers = False,` to `genFuncPointers = True,`
1. Change `protectProto = False,` to `protectProto = 'nonzero',`
1. Change `protectProtoStr = 'GL_GLEXT_PROTOTYPES',` to `protectProtoStr = 'GL_GLES_PROTOTYPES',`
1. Set your working directory to `OpenGL-Registry/xml/`.
1. Run `python genheaders.py ../api/GLES/gl.h`
1. The generated header will now be in `OpenGL-Registry/api/GLES/gl.h`. You can copy the header over to this folder.
1. Also update `scripts/gl.xml` with the latest version from `OpenGL-Registry/xml/`.
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