<commit_before>
Status of OpenGL 3.x features in Mesa


Note: when an item is marked as "DONE" it means all the core Mesa
infrastructure is complete but it may be the case that few (if any) drivers
implement the features.


OpenGL Core and Compatibility context support

OpenGL 3.1 and later versions are only supported with the Core profile.
There are no plans to support GL_ARB_compatibility. The last supported OpenGL
version with all deprecated features is 3.0. Some of the later GL features
are exposed in the 3.0 context as extensions.


Feature                                               Status
----------------------------------------------------- ------------------------

GL 3.0:

GLSL 1.30                                             DONE
glBindFragDataLocation, glGetFragDataLocation         DONE
Conditional rendering (GL_NV_conditional_render)      DONE (i965, r300, r600, swrast)
Map buffer subranges (GL_ARB_map_buffer_range)        DONE (i965, r300, r600, swrast)
Clamping controls (GL_ARB_color_buffer_float)         DONE (i965, r300, r600)
Float textures, renderbuffers (GL_ARB_texture_float)  DONE (i965, r300, r600)
GL_EXT_packed_float                                   DONE (i965, r600)
GL_EXT_texture_shared_exponent                        DONE (i965, r600, swrast)
Float depth buffers (GL_ARB_depth_buffer_float)       DONE (i965, r600)
Framebuffer objects (GL_ARB_framebuffer_object)       DONE (i965, r300, r600, swrast)
Half-float                                            DONE
Non-normalized Integer texture/framebuffer formats    DONE (i965, r600)
1D/2D Texture arrays                                  DONE
Per-buffer blend and masks (GL_EXT_draw_buffers2)     DONE (i965, r600, swrast)
GL_EXT_texture_compression_rgtc                       DONE (i965, r300, r600, swrast)
Red and red/green texture formats                     DONE (i965, swrast, gallium)
Transform feedback (GL_EXT_transform_feedback)        DONE (i965, r600)
Vertex array objects (GL_APPLE_vertex_array_object)   DONE (i965, r300, r600, swrast)
sRGB framebuffer format (GL_EXT_framebuffer_sRGB)     DONE (i965, r600)
glClearBuffer commands                                DONE
glGetStringi command                                  DONE
glTexParameterI, glGetTexParameterI commands          DONE
glVertexAttribI commands                              DONE
Depth format cube textures                            DONE
GLX_ARB_create_context (GLX 1.4 is required)          DONE


GL 3.1:

GLSL 1.40                                             DONE (i965, r600)
Forward compatibile context support/deprecations      DONE (i965, r600)
Instanced drawing (GL_ARB_draw_instanced)             DONE (i965, gallium, swrast)
Buffer copying (GL_ARB_copy_buffer)                   DONE (i965, r300, r600, swrast)
Primitive restart (GL_NV_primitive_restart)           DONE (i965, r600)
16 vertex texture image units                         DONE
Texture buffer objs (GL_ARB_texture_buffer_object)    DONE for OpenGL 3.1 contexts (i965, r600)
Rectangular textures (GL_ARB_texture_rectangle)       DONE (i965, r300, r600, swrast)
Uniform buffer objs (GL_ARB_uniform_buffer_object)    DONE (i965, r600, swrast)
Signed normalized textures (GL_EXT_texture_snorm)     DONE (i965, r300, r600)


GL 3.2:

Core/compatibility profiles                           DONE
GLSL 1.50                                             in progress
Geometry shaders (GL_ARB_geometry_shader4)            partially done
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                             DONE (i965)
GL_ARB_draw_buffers_blend                            DONE (i965, r600, softpipe)
GL_ARB_draw_indirect                                 started (Christoph)
GL_ARB_gpu_shader5                                   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                                started (Maxence, Chris)
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                      DONE (i965, gallium)
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                      DONE (i965)
ARB_texture_view                                     not started
ARB_vertex_attrib_binding                            started (Fredrik)


GL 4.4:

GLSL 4.4                                             not started
MAX_VERTEX_ATTRIB_STRIDE                             not started
ARB_buffer_storage                                   not started
ARB_clear_texture                                    not started
ARB_enhanced_layouts                                 not started
ARB_multi_bind                                       not started
ARB_query_buffer_object                              not started
ARB_texture_mirror_clamp_to_edge                     not started
ARB_texture_stencil8                                 not started
ARB_vertex_type_10f_11f_11f_rev                      not started


More info about these features and the work involved can be found at
http://dri.freedesktop.org/wiki/MissingFunctionality
<commit_msg>docs: Mark off ARB_texture_gather<commit_after>
Status of OpenGL 3.x features in Mesa


Note: when an item is marked as "DONE" it means all the core Mesa
infrastructure is complete but it may be the case that few (if any) drivers
implement the features.


OpenGL Core and Compatibility context support

OpenGL 3.1 and later versions are only supported with the Core profile.
There are no plans to support GL_ARB_compatibility. The last supported OpenGL
version with all deprecated features is 3.0. Some of the later GL features
are exposed in the 3.0 context as extensions.


Feature                                               Status
----------------------------------------------------- ------------------------

GL 3.0:

GLSL 1.30                                             DONE
glBindFragDataLocation, glGetFragDataLocation         DONE
Conditional rendering (GL_NV_conditional_render)      DONE (i965, r300, r600, swrast)
Map buffer subranges (GL_ARB_map_buffer_range)        DONE (i965, r300, r600, swrast)
Clamping controls (GL_ARB_color_buffer_float)         DONE (i965, r300, r600)
Float textures, renderbuffers (GL_ARB_texture_float)  DONE (i965, r300, r600)
GL_EXT_packed_float                                   DONE (i965, r600)
GL_EXT_texture_shared_exponent                        DONE (i965, r600, swrast)
Float depth buffers (GL_ARB_depth_buffer_float)       DONE (i965, r600)
Framebuffer objects (GL_ARB_framebuffer_object)       DONE (i965, r300, r600, swrast)
Half-float                                            DONE
Non-normalized Integer texture/framebuffer formats    DONE (i965, r600)
1D/2D Texture arrays                                  DONE
Per-buffer blend and masks (GL_EXT_draw_buffers2)     DONE (i965, r600, swrast)
GL_EXT_texture_compression_rgtc                       DONE (i965, r300, r600, swrast)
Red and red/green texture formats                     DONE (i965, swrast, gallium)
Transform feedback (GL_EXT_transform_feedback)        DONE (i965, r600)
Vertex array objects (GL_APPLE_vertex_array_object)   DONE (i965, r300, r600, swrast)
sRGB framebuffer format (GL_EXT_framebuffer_sRGB)     DONE (i965, r600)
glClearBuffer commands                                DONE
glGetStringi command                                  DONE
glTexParameterI, glGetTexParameterI commands          DONE
glVertexAttribI commands                              DONE
Depth format cube textures                            DONE
GLX_ARB_create_context (GLX 1.4 is required)          DONE


GL 3.1:

GLSL 1.40                                             DONE (i965, r600)
Forward compatibile context support/deprecations      DONE (i965, r600)
Instanced drawing (GL_ARB_draw_instanced)             DONE (i965, gallium, swrast)
Buffer copying (GL_ARB_copy_buffer)                   DONE (i965, r300, r600, swrast)
Primitive restart (GL_NV_primitive_restart)           DONE (i965, r600)
16 vertex texture image units                         DONE
Texture buffer objs (GL_ARB_texture_buffer_object)    DONE for OpenGL 3.1 contexts (i965, r600)
Rectangular textures (GL_ARB_texture_rectangle)       DONE (i965, r300, r600, swrast)
Uniform buffer objs (GL_ARB_uniform_buffer_object)    DONE (i965, r600, swrast)
Signed normalized textures (GL_EXT_texture_snorm)     DONE (i965, r300, r600)


GL 3.2:

Core/compatibility profiles                           DONE
GLSL 1.50                                             in progress
Geometry shaders (GL_ARB_geometry_shader4)            partially done
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                             DONE (i965)
GL_ARB_draw_buffers_blend                            DONE (i965, r600, softpipe)
GL_ARB_draw_indirect                                 started (Christoph)
GL_ARB_gpu_shader5                                   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                                DONE (i965)
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                      DONE (i965, gallium)
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                      DONE (i965)
ARB_texture_view                                     not started
ARB_vertex_attrib_binding                            started (Fredrik)


GL 4.4:

GLSL 4.4                                             not started
MAX_VERTEX_ATTRIB_STRIDE                             not started
ARB_buffer_storage                                   not started
ARB_clear_texture                                    not started
ARB_enhanced_layouts                                 not started
ARB_multi_bind                                       not started
ARB_query_buffer_object                              not started
ARB_texture_mirror_clamp_to_edge                     not started
ARB_texture_stencil8                                 not started
ARB_vertex_type_10f_11f_11f_rev                      not started


More info about these features and the work involved can be found at
http://dri.freedesktop.org/wiki/MissingFunctionality

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