+ Additional functionality not covered above:
+ glMemoryBarrierByRegion DONE
+ glGetTexLevelParameter[fi]v - needs updates DONE
+ glGetBooleani_v - restrict to GLES enums
+ gl_HelperInvocation support DONE (i965, nvc0, r600)
+
+GLES3.2, GLSL ES 3.2
+ GL_EXT_color_buffer_float DONE (all drivers)
+ GL_KHR_blend_equation_advanced not started
+ GL_KHR_debug DONE (all drivers)
+ GL_KHR_robustness 90% done (the ARB variant)
+ GL_KHR_texture_compression_astc_ldr DONE (i965/gen9+)
+ GL_OES_copy_image not started (based on GL_ARB_copy_image, which is done for some drivers)
+ GL_OES_draw_buffers_indexed not started
+ GL_OES_draw_elements_base_vertex DONE (all drivers)
+ GL_OES_geometry_shader started (Marta)
+ GL_OES_gpu_shader5 not started (based on parts of GL_ARB_gpu_shader5, which is done for some drivers)
+ GL_OES_primitive_bounding box not started
+ GL_OES_sample_shading not started (based on parts of GL_ARB_sample_shading, which is done for some drivers)
+ GL_OES_sample_variables not started (based on parts of GL_ARB_sample_shading, which is done for some drivers)
+ GL_OES_shader_image_atomic not started (based on parts of GL_ARB_shader_image_load_store, which is done for some drivers)
+ GL_OES_shader_io_blocks not started (based on parts of GLSL 1.50, which is done)
+ GL_OES_shader_multisample_interpolation not started (based on parts of GL_ARB_gpu_shader5, which is done)
+ GL_OES_tessellation_shader not started (based on GL_ARB_tessellation_shader, which is done for some drivers)
+ GL_OES_texture_border_clamp not started (based on GL_ARB_texture_border_clamp, which is done)
+ GL_OES_texture_buffer not started (based on GL_ARB_texture_buffer_object, GL_ARB_texture_buffer_range, and GL_ARB_texture_buffer_object_rgb32 that are all done)
+ GL_OES_texture_cube_map_array not started (based on GL_ARB_texture_cube_map_array, which is done for all drivers)
+ GL_OES_texture_stencil8 not started (based on GL_ARB_texture_stencil8, which is done for some drivers)
+ GL_OES_texture_storage_multisample_2d_array DONE (all drivers that support GL_ARB_texture_multisample)