The check is against what the driver max is, not what the application
requested.
Using overrides messes up this logic, it seems.
On Fri, May 18, 2018, 06:14 Benedikt Schemmer <b...@besd.de> wrote:
> Yes its backwards and it seems it doesn't work anymore ;)
> Seems the loophole I was using got removed.
>
> Problem remains that applications that could use an legacy extension
> are not aware of it and will simply/usually not request it:
>
> MESA_GL_VERSION_OVERRIDE=3.2 MESA_GLSL_VERSION_OVERRIDE=150 glxinfo | grep
> shader5
> -nothing-
>
> MESA_GL_VERSION_OVERRIDE=3.2 MESA_GLSL_VERSION_OVERRIDE=400 glxinfo | grep
> shader5
> GL_ARB_gpu_shader5, GL_ARB_gpu_shader_fp64, GL_ARB_gpu_shader_int64,
> GL_ARB_gpu_shader5, GL_ARB_half_float_pixel, GL_ARB_half_float_vertex,
> GL_EXT_gpu_shader5, GL_EXT_map_buffer_range, GL_EXT_memory_object,
> GL_OES_get_program_binary, GL_OES_gpu_shader5, GL_OES_mapbuffer,
>
>
> If an application knows about GLSL 400 it doesn't need GL_ARB_gpu_shader5
> anymore.
>
>
>
> Am 18.05.2018 um 11:25 schrieb Timothy Arceri:
> > Hi Benedikt,
> >
> > I think you have this backwards. compute_version() computes the version
> of OpenGL supported by the driver by checking what extensions it
> advertises. See version 2 of my patch to see where the
> > extensions are enabled. I don't think this is something that can be
> automated, it really depends on the driver, just because an extension can
> be advertised at a certain level doesn't mean you must (or
> > can) do it.
> >
> > Tim
> >
> > On 18/05/18 19:13, Benedikt Schemmer wrote:
> >> Hi Timothy,
> >>
> >> I was looking into something similar myself.
> >> Great to see someone working on getting legacy extensions available
> >> to the applications that can actually use them!
> >>
> >> Another thing I noticed is that extensions aren't advertised at the
> >> correct feature level.
> >> The code below works and does a better job at it, but its probably also
> >> the wrong way to go about it.
> >>
> >> Cheers,
> >> Benedikt
> >>
> >> P.S. I grepped and sed together a file which describes the requirements
> >> for every extension better, unfortunately the files on khronos
> >> arent exactly machine readable
> >> will send in next reply
> >>
> >> ---
> >>
> >> diff --git a/src/mesa/main/version.c b/src/mesa/main/version.c
> >> --- a/src/mesa/main/version.c
> >> +++ b/src/mesa/main/version.c
> >> @@ -233,8 +233,15 @@ _mesa_override_glsl_version(struct gl_constants
> *consts)
> >> }
> >>
> >> /**
> >> - * Examine enabled GL extensions to determine GL version.
> >> + * Enable GL Extensions according to the minimum version requirements
> as per spec.
> >> + * Careful: some extensions are implemented for the express purpose of
> being
> >> + * used in a lower version context (legacy extensions).
> >> + * Example:
> >> + * ARB_gpu_shader5: first implementation in OpenGL 4.0 (GLSL 400) but
> >> + * supposed to be advertised from OpenGL 3.2 (GLSL 150) upwards,
> >> + * however early Nvidia FXAA could use it from GLSL 120 so advertise
> it there
> >> */
> >> +
> >> static GLuint
> >> compute_version(const struct gl_extensions *extensions,
> >> const struct gl_constants *consts, gl_api api)
> >> @@ -242,25 +249,43 @@ compute_version(const struct gl_extensions
> *extensions,
> >> GLuint major, minor, version;
> >>
> >> const bool ver_1_3 = (extensions->ARB_texture_border_clamp &&
> >> + extensions->ARB_instanced_arrays &&
> >> + extensions->ARB_shadow &&
> >> + extensions->ARB_vertex_shader &&
> >> + extensions->ARB_fragment_shader &&
> >> + extensions->ARB_depth_texture &&
> >> + extensions->ARB_occlusion_query2 &&
> >> extensions->ARB_texture_cube_map &&
> >> + extensions->ARB_seamless_cube_map &&
> >> extensions->ARB_texture_env_combine &&
> >> + extensions->ARB_texture_rg &&
> >> + extensions->ARB_texture_compression_rgtc &&
> >> + extensions->ARB_texture_compression_bptc &&
> >> + extensions->ARB_texture_float &&
> >> + extensions->ARB_framebuffer_object &&
> >> + extensions->ARB_framebuffer_no_attachments &&
> >> extensions->ARB_texture_env_dot3);
> >> const bool ver_1_4 = (ver_1_3 &&
> >> - extensions->ARB_depth_texture &&
> >> - extensions->ARB_shadow &&
> >> + extensions->ARB_stencil_texturing &&
> >> extensions->ARB_texture_env_crossbar &&
> >> + extensions->ARB_texture_mirror_clamp_to_edge
> &&
> >> extensions->EXT_blend_color &&
> >> extensions->EXT_blend_func_separate &&
> >> extensions->EXT_blend_minmax &&
> >> extensions->EXT_point_parameters);
> >> const bool ver_1_5 = (ver_1_4 &&
> >> + extensions->ARB_query_buffer_object &&
> >> extensions->ARB_occlusion_query);
> >> const bool ver_2_0 = (ver_1_5 &&
> >> extensions->ARB_point_sprite &&
> >> - extensions->ARB_vertex_shader &&
> >> - extensions->ARB_fragment_shader &&
> >> + extensions->ARB_blend_func_extended &&
> >> extensions->ARB_texture_non_power_of_two &&
> >> extensions->EXT_blend_equation_separate &&
> >> + extensions->ARB_shader_texture_lod &&
> >> + extensions->ARB_transform_feedback2 &&
> >> + extensions->ARB_uniform_buffer_object &&
> >> + extensions->ARB_texture_buffer_object &&
> >> + extensions->ARB_texture_buffer_range &&
> >>
> >> /* Technically, 2.0 requires the
> functionality of the
> >> * EXT version. Enable 2.0 if either
> extension is
> >> @@ -272,33 +297,44 @@ compute_version(const struct gl_extensions
> *extensions,
> >> || extensions->ATI_separate_stencil));
> >> const bool ver_2_1 = (ver_2_0 &&
> >> extensions->EXT_pixel_buffer_object &&
> >> + extensions->ARB_map_buffer_range &&
> >> + extensions->ARB_draw_instanced &&
> >> + extensions->ARB_shader_bit_encoding &&
> >> + extensions->ARB_gpu_shader5 &&
> >> extensions->EXT_texture_sRGB);
> >> const bool ver_3_0 = (ver_2_1 &&
> >> consts->GLSLVersion >= 130 &&
> >> (consts->MaxSamples >= 4 ||
> consts->FakeSWMSAA) &&
> >> (api == API_OPENGL_CORE ||
> >> extensions->ARB_color_buffer_float) &&
> >> + extensions->ARB_conservative_depth &&
> >> extensions->ARB_depth_buffer_float &&
> >> extensions->ARB_half_float_vertex &&
> >> - extensions->ARB_map_buffer_range &&
> >> - extensions->ARB_shader_texture_lod &&
> >> - extensions->ARB_texture_float &&
> >> - extensions->ARB_texture_rg &&
> >> - extensions->ARB_texture_compression_rgtc &&
> >> + extensions->ARB_pipeline_statistics_query &&
> >> + extensions->ARB_shader_image_load_store &&
> >> + extensions->ARB_texture_rgb10_a2ui &&
> >> + extensions->ARB_vertex_type_10f_11f_11f_rev &&
> >> extensions->EXT_draw_buffers2 &&
> >> - extensions->ARB_framebuffer_object &&
> >> + extensions->ARB_transform_feedback_instanced
> &&
> >> + extensions->ARB_internalformat_query &&
> >> + extensions->ARB_internalformat_query2 &&
> >> extensions->EXT_framebuffer_sRGB &&
> >> extensions->EXT_packed_float &&
> >> + extensions->ARB_sample_shading &&
> >> + extensions->ARB_shader_atomic_counters &&
> >> extensions->EXT_texture_array &&
> >> + extensions->ARB_texture_query_lod &&
> >> extensions->EXT_texture_shared_exponent &&
> >> extensions->EXT_transform_feedback &&
> >> - extensions->NV_conditional_render);
> >> + extensions->NV_conditional_render &&
> >> + extensions->ARB_texture_cube_map_array &&
> >> +
> extensions->ARB_transform_feedback_overflow_query);
> >> const bool ver_3_1 = (ver_3_0 &&
> >> consts->GLSLVersion >= 140 &&
> >> - extensions->ARB_draw_instanced &&
> >> - extensions->ARB_texture_buffer_object &&
> >> - extensions->ARB_uniform_buffer_object &&
> >> extensions->EXT_texture_snorm &&
> >> + extensions->ARB_shading_language_420pack &&
> >> + extensions->ARB_sync &&
> >> + extensions->ARB_draw_indirect &&
> >> extensions->NV_primitive_restart &&
> >> extensions->NV_texture_rectangle &&
> >>
> consts->Program[MESA_SHADER_VERTEX].MaxTextureImageUnits >= 16);
> >> @@ -308,18 +344,17 @@ compute_version(const struct gl_extensions
> *extensions,
> >> extensions->ARB_draw_elements_base_vertex &&
> >> extensions->ARB_fragment_coord_conventions &&
> >> extensions->EXT_provoking_vertex &&
> >> - extensions->ARB_seamless_cube_map &&
> >> - extensions->ARB_sync &&
> >> + extensions->ARB_gpu_shader_fp64 &&
> >> + extensions->ARB_vertex_attrib_64bit &&
> >> extensions->ARB_texture_multisample &&
> >> - extensions->EXT_vertex_array_bgra);
> >> + extensions->ARB_tessellation_shader &&
> >> + extensions->EXT_vertex_array_bgra &&
> >> + extensions->ARB_fragment_layer_viewport &&
> >> + extensions->ARB_viewport_array);
> >> const bool ver_3_3 = (ver_3_2 &&
> >> consts->GLSLVersion >= 330 &&
> >> - extensions->ARB_blend_func_extended &&
> >> extensions->ARB_explicit_attrib_location &&
> >> - extensions->ARB_instanced_arrays &&
> >> - extensions->ARB_occlusion_query2 &&
> >> - extensions->ARB_shader_bit_encoding &&
> >> - extensions->ARB_texture_rgb10_a2ui &&
> >> + extensions->ARB_explicit_uniform_location &&
> >> extensions->ARB_timer_query &&
> >> extensions->ARB_vertex_type_2_10_10_10_rev &&
> >> extensions->EXT_texture_swizzle);
> >> @@ -328,67 +363,42 @@ compute_version(const struct gl_extensions
> *extensions,
> >> const bool ver_4_0 = (ver_3_3 &&
> >> consts->GLSLVersion >= 400 &&
> >> extensions->ARB_draw_buffers_blend &&
> >> - extensions->ARB_draw_indirect &&
> >> - extensions->ARB_gpu_shader5 &&
> >> - extensions->ARB_gpu_shader_fp64 &&
> >> - extensions->ARB_sample_shading &&
> >> - extensions->ARB_tessellation_shader &&
> >> + extensions->ARB_derivative_control &&
> >> extensions->ARB_texture_buffer_object_rgb32
> &&
> >> - extensions->ARB_texture_cube_map_array &&
> >> - extensions->ARB_texture_query_lod &&
> >> - extensions->ARB_transform_feedback2 &&
> >> extensions->ARB_transform_feedback3);
> >> const bool ver_4_1 = (ver_4_0 &&
> >> consts->GLSLVersion >= 410 &&
> >> extensions->ARB_ES2_compatibility &&
> >> - extensions->ARB_shader_precision &&
> >> - extensions->ARB_vertex_attrib_64bit &&
> >> - extensions->ARB_viewport_array);
> >> + extensions->ARB_shading_language_packing &&
> >> + extensions->ARB_shader_precision);
> >> const bool ver_4_2 = (ver_4_1 &&
> >> consts->GLSLVersion >= 420 &&
> >> extensions->ARB_base_instance &&
> >> - extensions->ARB_conservative_depth &&
> >> - extensions->ARB_internalformat_query &&
> >> - extensions->ARB_shader_atomic_counters &&
> >> - extensions->ARB_shader_image_load_store &&
> >> - extensions->ARB_shading_language_420pack &&
> >> - extensions->ARB_shading_language_packing &&
> >> - extensions->ARB_texture_compression_bptc &&
> >> - extensions->ARB_transform_feedback_instanced);
> >> + extensions->ARB_compute_shader &&
> >> + extensions->ARB_shader_atomic_counter_ops);
> >> const bool ver_4_3 = (ver_4_2 &&
> >> consts->GLSLVersion >= 430 &&
> >>
> consts->Program[MESA_SHADER_VERTEX].MaxUniformBlocks >= 14 &&
> >> extensions->ARB_ES3_compatibility &&
> >> extensions->ARB_arrays_of_arrays &&
> >> - extensions->ARB_compute_shader &&
> >> + extensions->ARB_buffer_storage &&
> >> extensions->ARB_copy_image &&
> >> - extensions->ARB_explicit_uniform_location &&
> >> - extensions->ARB_fragment_layer_viewport &&
> >> - extensions->ARB_framebuffer_no_attachments &&
> >> - extensions->ARB_internalformat_query2 &&
> >>
> extensions->ARB_robust_buffer_access_behavior &&
> >> extensions->ARB_shader_image_size &&
> >> extensions->ARB_shader_storage_buffer_object
> &&
> >> - extensions->ARB_stencil_texturing &&
> >> - extensions->ARB_texture_buffer_range &&
> >> extensions->ARB_texture_query_levels &&
> >> extensions->ARB_texture_view);
> >> const bool ver_4_4 = (ver_4_3 &&
> >> consts->GLSLVersion >= 440 &&
> >> - extensions->ARB_buffer_storage &&
> >> extensions->ARB_clear_texture &&
> >> extensions->ARB_enhanced_layouts &&
> >> - extensions->ARB_query_buffer_object &&
> >> - extensions->ARB_texture_mirror_clamp_to_edge
> &&
> >> - extensions->ARB_texture_stencil8 &&
> >> - extensions->ARB_vertex_type_10f_11f_11f_rev);
> >> + extensions->ARB_texture_stencil8);
> >> const bool ver_4_5 = (ver_4_4 &&
> >> consts->GLSLVersion >= 450 &&
> >> extensions->ARB_ES3_1_compatibility &&
> >> extensions->ARB_clip_control &&
> >> extensions->ARB_conditional_render_inverted
> &&
> >> extensions->ARB_cull_distance &&
> >> - extensions->ARB_derivative_control &&
> >> extensions->ARB_shader_texture_image_samples
> &&
> >> extensions->NV_texture_barrier);
> >> const bool ver_4_6 = (ver_4_5 &&
> >> @@ -396,13 +406,10 @@ compute_version(const struct gl_extensions
> *extensions,
> >> /* extensions->ARB_gl_spirv */ 0 &&
> >> /* extensions->ARB_spirv_extensions */ 0 &&
> >> extensions->ARB_indirect_parameters &&
> >> - extensions->ARB_pipeline_statistics_query &&
> >> extensions->ARB_polygon_offset_clamp &&
> >> - extensions->ARB_shader_atomic_counter_ops &&
> >> extensions->ARB_shader_draw_parameters &&
> >> extensions->ARB_shader_group_vote &&
> >> - extensions->ARB_texture_filter_anisotropic &&
> >> -
> extensions->ARB_transform_feedback_overflow_query);
> >> + extensions->ARB_texture_filter_anisotropic);
> >>
> >> if (ver_4_6) {
> >> major = 4;
> >>
> _______________________________________________
> mesa-dev mailing list
> mesa-dev@lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/mesa-dev
>
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