There are a bunch of OpenGL ES 2.0 extensions, primarily vendor extensions, that expose existing desktop GL functionality in ES. Since Mesa is full desktop GL, we should expose as many of these as possible in ES "mode." Scanning the list in the ES registry and mesa/main/extensions.c, it looks like the following could be trivially added: GL_APPLE_texture_2D_limited_npot GL_EXT_shader_texture_lod GL_EXT_read_format_bgra GL_APPLE_framebuffer_multisample GL_APPLE_texture_format_BGRA8888 GL_APPLE_texture_max_level GL_ARM_rgba8 GL_ANGLE_framebuffer_blit GL_ANGLE_framebuffer_multisample GL_EXT_frag_depth
I think at this stage we have enabled most extensions people care about. I doubt anyone has looked at this bug in years so closing.
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