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The State Of OpenGL 3/4 Support In Mesa/Gallium3D

Mesa

Published on 22 March 2013 01:53 AM EDT
Written by Michael Larabel in Mesa
11 Comments

With updated documentation in the Mesa tree, here's a look at what's left to be accomplished for the Mesa drivers to catch up with the latest upstream Khronos specifications for OpenGL 3.x and OpenGL 4.x.

The ARB_ES3_compatibility extension as mandated by the desktop OpenGL 4.3 standard is now written off as done within the documentation, thanks to Intel OTC quickly doing OpenGL ES 3.0 support in Mesa, so now the overall list appears as:
GL 3.2:

Core/compatibility profiles                           DONE
GLSL 1.50                                             not started
Geometry shaders (GL_ARB_geometry_shader4)            partially done (Zack)
BGRA vertex order (GL_ARB_vertex_array_bgra)          DONE (i965, r300, r600, swrast)
Base vertex offset(GL_ARB_draw_elements_base_vertex)  DONE (i965, r300, r600, swrast)
Frag shader coord (GL_ARB_fragment_coord_conventions) DONE (i965, r300, r600, swrast)
Provoking vertex (GL_ARB_provoking_vertex)            DONE (i965, r300, r600, swrast)
Seamless cubemaps (GL_ARB_seamless_cube_map)          DONE (i965, r600)
Multisample textures (GL_ARB_texture_multisample)     DONE (i965)
Frag depth clamp (GL_ARB_depth_clamp)                 DONE (i965, r600, swrast)
Fence objects (GL_ARB_sync)                           DONE (i965, r300, r600, swrast)
GLX_ARB_create_context_profile                        DONE


GL 3.3:

GLSL 3.30                                             new features in this version pretty much done
GL_ARB_blend_func_extended                            DONE (i965, r600, softpipe)
GL_ARB_explicit_attrib_location                       DONE (i915, i965, r300, r600, swrast)
GL_ARB_occlusion_query2                               DONE (i965, r300, r600, swrast)
GL_ARB_sampler_objects                                DONE (i965, r300, r600)
GL_ARB_shader_bit_encoding                            DONE
GL_ARB_texture_rgb10_a2ui                             DONE (i965, r600)
GL_ARB_texture_swizzle                                DONE (same as EXT version) (i965, r300, r600, swrast)
GL_ARB_timer_query                                    DONE (i965, r600)
GL_ARB_instanced_arrays                               DONE (i965, r300, r600)
GL_ARB_vertex_type_2_10_10_10_rev                     DONE (i965, r600)


GL 4.0:

GLSL 4.0                                             not started
GL_ARB_texture_query_lod                             not started
GL_ARB_draw_buffers_blend                            DONE (i965, r600, softpipe)
GL_ARB_draw_indirect                                 not started
GL_ARB_gpu_shader5                                   not started
GL_ARB_gpu_shader_fp64                               not started
GL_ARB_sample_shading                                not started
GL_ARB_shader_subroutine                             not started
GL_ARB_tessellation_shader                           not started
GL_ARB_texture_buffer_object_rgb32                   DONE (i965, softpipe)
GL_ARB_texture_cube_map_array                        DONE (i965, softpipe)
GL_ARB_texture_gather                                not started
GL_ARB_transform_feedback2                           DONE
GL_ARB_transform_feedback3                           DONE


GL 4.1:

GLSL 4.1                                             not started
GL_ARB_ES2_compatibility                             DONE (i965, r300, r600)
GL_ARB_get_program_binary                            DONE (0 binary formats)
GL_ARB_separate_shader_objects                       some infrastructure done
GL_ARB_shader_precision                              not started
GL_ARB_vertex_attrib_64bit                           not started
GL_ARB_viewport_array                                not started


GL 4.2:

GLSL 4.2                                             not started
GL_ARB_texture_compression_bptc                      not started
GL_ARB_compressed_texture_pixel_storage              not started
GL_ARB_shader_atomic_counters                        not started
GL_ARB_texture_storage                               DONE (i965, r300, r600, swrast, gallium)
GL_ARB_transform_feedback_instanced                  DONE
GL_ARB_base_instance                                 DONE (i965, nv50, nvc0, r600, radeonsi)
GL_ARB_shader_image_load_store                       not started
GL_ARB_conservative_depth                            DONE (softpipe)
GL_ARB_shading_language_420pack                      not started
GL_ARB_internalformat_query                          DONE (i965, gallium)
GL_ARB_map_buffer_alignment                          DONE (r300, r600, radeonsi)


GL 4.3:

GLSL 4.3                                             not started
ARB_arrays_of_arrays                                 not started
ARB_ES3_compatibility                                DONE (i965)
ARB_clear_buffer_object                              not started
ARB_compute_shader                                   started (gallium)
ARB_copy_image                                       not started
KHR_debug                                            some work done (ARB_debug_output)
ARB_explicit_uniform_location                        not started
ARB_fragment_layer_viewport                          not started
ARB_framebuffer_no_attachments                       not started
ARB_internalformat_query2                            not started
ARB_invalidate_subdata                               not started
ARB_multi_draw_indirect                              not started
ARB_program_interface_query                          not started
ARB_robust_buffer_access_behavior                    not started
ARB_shader_image_size                                not started
ARB_shader_storage_buffer_object                     not started
ARB_stencil_texturing                                not started
ARB_texture_buffer_range                             DONE (nv50, nvc0)
ARB_texture_query_levels                             not started
ARB_texture_storage_multisample                      not started
ARB_texture_view                                     not started
ARB_vertex_attrib_binding                            not started
For reaching OpenGL 3.2 compliance, most of what's left is OpenGL Shading Language (GLSL) 1.50 support along with bits of the geometry shaders enablement. After that, OpenGL 3.3 will quickly come into place.

OpenGL 4.x features though, however, have a lot of work until they'll be found fully implemented in Mesa/Gallium3D... Don't expect them in 2013. It's going to be a long time until OpenGL 4.3 compliance is found in Mesa, which is sad considering the next Khronos OpenGL specification update is right around the corner.

About The Author
Michael Larabel is the principal author of Phoronix.com and founded the web-site in 2004 with a focus on enriching the Linux hardware experience and being the largest web-site devoted to Linux hardware reviews, particularly for products relevant to Linux gamers and enthusiasts but also commonly reviewing servers/workstations and embedded Linux devices. Michael has written more than 10,000 articles covering the state of Linux hardware support, Linux performance, graphics hardware drivers, and other topics. Michael is also the lead developer of the Phoronix Test Suite, Phoromatic, and OpenBenchmarking.org automated testing software. He can be followed via and or contacted via .
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