After OpenGL 4.5, The Mesa OpenGL 4 Support Matrix

Now that OpenGL 4.5 was released yesterday by the Khronos Group, while NVIDIA already has an OpenGL 4.5 driver, it will be a longtime before the open-source Mesa/Gallium3D drivers are able to claim OpenGL 4.5 compliance.

OpenGL 4.5 was an evolutionary update to the GL spec with the Khronos Group now focusing on developing a new graphics API to take on AMD's Mantle, Apple's Metal, and Microsoft's DirectX 12. Fortunately the OpenGL 4.5 Mesa support isn't in total shambles as some of the new GL 4.5 extensions were proposed by Brian Paul and others at VMware, which were part of the original Mesa team before the virtualization company acquired Tungsten Graphics.

The latest OpenGL 3/4 documentation shows:

GL 4.0, GLSL 4.00:
GL_ARB_draw_buffers_blend DONE (i965, nv50, nvc0, r600, radeonsi, softpipe)
GL_ARB_draw_indirect DONE (i965, nvc0, radeonsi, softpipe, llvmpipe)
GL_ARB_gpu_shader5 started
- 'precise' qualifier DONE
- Dynamically uniform sampler array indices started (Chris)
- Dynamically uniform UBO array indices started (Chris)
- Implicit signed -> unsigned conversions DONE
- Fused multiply-add DONE (i965, nvc0)
- Packing/bitfield/conversion functions DONE (i965, nvc0, r600)
- Enhanced textureGather DONE (i965, nvc0, r600, radeonsi)
- Geometry shader instancing DONE (i965, nvc0)
- Geometry shader multiple streams DONE (i965, nvc0)
- Enhanced per-sample shading DONE (i965, r600)
- Interpolation functions DONE (i965)
- New overload resolution rules DONE
GL_ARB_gpu_shader_fp64 started (Dave)
GL_ARB_sample_shading DONE (i965, nv50, nvc0, radeonsi)
GL_ARB_shader_subroutine not started
GL_ARB_tessellation_shader started (Fabian)
GL_ARB_texture_buffer_object_rgb32 DONE (i965, nvc0, r600, radeonsi, softpipe)
GL_ARB_texture_cube_map_array DONE (i965, nv50, nvc0, r600, radeonsi, softpipe)
GL_ARB_texture_gather DONE (i965, nv50, nvc0, r600, radeonsi)
GL_ARB_texture_query_lod DONE (i965, nv50, nvc0, r600, radeonsi)
GL_ARB_transform_feedback2 DONE (i965, nv50, nvc0, r600, radeonsi)
GL_ARB_transform_feedback3 DONE (i965, nv50, nvc0, r600, radeonsi)

GL 4.1, GLSL 4.10:
GL_ARB_ES2_compatibility DONE (i965, nv50, nvc0, r300, r600, radeonsi)
GL_ARB_get_program_binary DONE (0 binary formats)
GL_ARB_separate_shader_objects DONE (all drivers)
GL_ARB_shader_precision started (Micah)
GL_ARB_vertex_attrib_64bit not started
GL_ARB_viewport_array DONE (i965, nv50, nvc0, r600)

GL 4.2, GLSL 4.20:
GL_ARB_texture_compression_bptc DONE (i965)
GL_ARB_compressed_texture_pixel_storage DONE (all drivers)
GL_ARB_shader_atomic_counters DONE (i965)
GL_ARB_texture_storage DONE (all drivers)
GL_ARB_transform_feedback_instanced DONE (i965, nv50, nvc0, r600, radeonsi)
GL_ARB_base_instance DONE (i965, nv50, nvc0, r600, radeonsi)
GL_ARB_shader_image_load_store in progress (curro)
GL_ARB_conservative_depth DONE (all drivers that support GLSL 1.30)
GL_ARB_shading_language_420pack DONE (all drivers that support GLSL 1.30)
GL_ARB_internalformat_query DONE (i965, nv50, nvc0, r300, r600, radeonsi)
GL_ARB_map_buffer_alignment DONE (all drivers)

GL 4.3, GLSL 4.30:
GL_ARB_arrays_of_arrays started (Timothy)
GL_ARB_ES3_compatibility DONE (all drivers that support GLSL 3.30)
GL_ARB_clear_buffer_object DONE (all drivers)
GL_ARB_compute_shader started (currently stalled)
GL_ARB_copy_image DONE (i965)
GL_KHR_debug DONE (all drivers)
GL_ARB_explicit_uniform_location DONE (all drivers that support GLSL)
GL_ARB_fragment_layer_viewport DONE (nv50, nvc0, r600)
GL_ARB_framebuffer_no_attachments not started
GL_ARB_internalformat_query2 not started
GL_ARB_invalidate_subdata DONE (all drivers)
GL_ARB_multi_draw_indirect DONE (i965, nvc0, radeonsi, softpipe, llvmpipe)
GL_ARB_program_interface_query not started
GL_ARB_robust_buffer_access_behavior not started
GL_ARB_shader_image_size not started
GL_ARB_shader_storage_buffer_object not started
GL_ARB_stencil_texturing DONE (i965/gen8+, nv50, nvc0, r600, radeonsi)
GL_ARB_texture_buffer_range DONE (nv50, nvc0, i965, r600, radeonsi)
GL_ARB_texture_query_levels DONE (all drivers that support GLSL 1.30)
GL_ARB_texture_storage_multisample DONE (all drivers that support GL_ARB_texture_multisample)
GL_ARB_texture_view DONE (i965)
GL_ARB_vertex_attrib_binding DONE (all drivers)

GL 4.4, GLSL 4.40:
GL_MAX_VERTEX_ATTRIB_STRIDE not started
GL_ARB_buffer_storage DONE (i965, nv30, nv50, nvc0, r300, r600, radeonsi)
GL_ARB_clear_texture DONE (i965)
GL_ARB_enhanced_layouts not started
GL_ARB_multi_bind DONE (all drivers)
GL_ARB_query_buffer_object not started
GL_ARB_texture_mirror_clamp_to_edge DONE (i965, nv30, nv50, nvc0, r300, r600, radeonsi, swrast)
GL_ARB_texture_stencil8 not started
GL_ARB_vertex_type_10f_11f_11f_rev DONE (i965, nv50, nvc0, r600, radeonsi)

GL 4.5, GLSL 4.50:
GL_ARB_ES3_1_compatibility not started
GL_ARB_clip_control not started
GL_ARB_conditional_render_inverted not started
GL_ARB_cull_distance not started
GL_ARB_derivative_control not started
GL_ARB_direct_state_access not started
GL_ARB_get_texture_sub_image started (Brian Paul)
GL_ARB_shader_texture_image_samples not started
GL_ARB_texture_barrier started (Ilia Mirkin)
GL_KHR_context_flush_control not started
GL_KHR_robust_buffer_access_behavior not started
GL_KHR_robustness 90% done (the ARB variant)

With Intel's Open-Source Technology Center leading Mesa's development of new OpenGL support, they are very close with OpenGL 4.0~4.2 support but there still is a long road ahead before OpenGL 4.5 support is reached... I certainly would be incredibly surprised if OpenGL 4.5 support for Mesa was reached within the next twelve months. The Mesa support is years behind but seems to be slowly but surely catching up, except for now besides needing to reach OpenGL 4.5 support will also need to support an entirely new graphics API being devised in the months ahead by Khronos and its stakeholders.