| /* |
| * Mesa 3-D graphics library |
| * |
| * Copyright (C) 2010 VMware, Inc. All Rights Reserved. |
| * |
| * Permission is hereby granted, free of charge, to any person obtaining a |
| * copy of this software and associated documentation files (the "Software"), |
| * to deal in the Software without restriction, including without limitation |
| * the rights to use, copy, modify, merge, publish, distribute, sublicense, |
| * and/or sell copies of the Software, and to permit persons to whom the |
| * Software is furnished to do so, subject to the following conditions: |
| * |
| * The above copyright notice and this permission notice shall be included |
| * in all copies or substantial portions of the Software. |
| * |
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS |
| * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
| * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR |
| * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, |
| * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR |
| * OTHER DEALINGS IN THE SOFTWARE. |
| */ |
| |
| |
| #include <stdio.h> |
| #include "context.h" |
| #include "imports.h" |
| #include "mtypes.h" |
| #include "version.h" |
| |
| /** |
| * Scans 'string' to see if it ends with 'ending'. |
| */ |
| static bool |
| check_for_ending(const char *string, const char *ending) |
| { |
| const size_t len1 = strlen(string); |
| const size_t len2 = strlen(ending); |
| |
| if (len2 > len1) |
| return false; |
| |
| return strcmp(string + (len1 - len2), ending) == 0; |
| } |
| |
| /** |
| * Returns the gl override data |
| * |
| * version > 0 indicates there is an override requested |
| * fwd_context is only valid if version > 0 |
| */ |
| static void |
| get_gl_override(gl_api api, int *version, bool *fwd_context, |
| bool *compat_context) |
| { |
| const char *env_var = (api == API_OPENGL_CORE || api == API_OPENGL_COMPAT) |
| ? "MESA_GL_VERSION_OVERRIDE" : "MESA_GLES_VERSION_OVERRIDE"; |
| const char *version_str; |
| int major, minor, n; |
| static struct override_info { |
| int version; |
| bool fc_suffix; |
| bool compat_suffix; |
| } override[] = { |
| { -1, false, false}, |
| { -1, false, false}, |
| { -1, false, false}, |
| { -1, false, false}, |
| }; |
| |
| STATIC_ASSERT(ARRAY_SIZE(override) == API_OPENGL_LAST + 1); |
| |
| if (api == API_OPENGLES) |
| goto exit; |
| |
| if (override[api].version < 0) { |
| override[api].version = 0; |
| |
| version_str = getenv(env_var); |
| if (version_str) { |
| override[api].fc_suffix = check_for_ending(version_str, "FC"); |
| override[api].compat_suffix = check_for_ending(version_str, "COMPAT"); |
| |
| n = sscanf(version_str, "%u.%u", &major, &minor); |
| if (n != 2) { |
| fprintf(stderr, "error: invalid value for %s: %s\n", |
| env_var, version_str); |
| override[api].version = 0; |
| } else { |
| override[api].version = major * 10 + minor; |
| |
| /* There is no such thing as compatibility or forward-compatible for |
| * OpenGL ES 2.0 or 3.x APIs. |
| */ |
| if ((override[api].version < 30 && override[api].fc_suffix) || |
| (api == API_OPENGLES2 && (override[api].fc_suffix || |
| override[api].compat_suffix))) { |
| fprintf(stderr, "error: invalid value for %s: %s\n", |
| env_var, version_str); |
| } |
| } |
| } |
| } |
| |
| exit: |
| *version = override[api].version; |
| *fwd_context = override[api].fc_suffix; |
| *compat_context = override[api].compat_suffix; |
| } |
| |
| /** |
| * Builds the Mesa version string. |
| */ |
| static void |
| create_version_string(struct gl_context *ctx, const char *prefix) |
| { |
| static const int max = 100; |
| |
| ctx->VersionString = malloc(max); |
| if (ctx->VersionString) { |
| _mesa_snprintf(ctx->VersionString, max, |
| "%s%u.%u%s Mesa " PACKAGE_VERSION |
| #ifdef MESA_GIT_SHA1 |
| " (" MESA_GIT_SHA1 ")" |
| #endif |
| , |
| prefix, |
| ctx->Version / 10, ctx->Version % 10, |
| (ctx->API == API_OPENGL_CORE) ? " (Core Profile)" : "" |
| ); |
| } |
| } |
| |
| /** |
| * Override the context's version and/or API type if the |
| * environment variable MESA_GL_VERSION_OVERRIDE is set. |
| * |
| * Example uses of MESA_GL_VERSION_OVERRIDE: |
| * |
| * 2.1: select a compatibility (non-Core) profile with GL version 2.1 |
| * 3.0: select a compatibility (non-Core) profile with GL version 3.0 |
| * 3.0FC: select a Core+Forward Compatible profile with GL version 3.0 |
| * 3.1: select a Core profile with GL version 3.1 |
| * 3.1FC: select a Core+Forward Compatible profile with GL version 3.1 |
| */ |
| bool |
| _mesa_override_gl_version_contextless(struct gl_constants *consts, |
| gl_api *apiOut, GLuint *versionOut) |
| { |
| int version; |
| bool fwd_context, compat_context; |
| |
| get_gl_override(*apiOut, &version, &fwd_context, &compat_context); |
| |
| if (version > 0) { |
| *versionOut = version; |
| |
| /* If the API is a desktop API, adjust the context flags. We may also |
| * need to modify the API depending on the version. For example, Mesa |
| * does not support a GL 3.3 compatibility profile. |
| */ |
| if (*apiOut == API_OPENGL_CORE || *apiOut == API_OPENGL_COMPAT) { |
| if (version >= 30 && fwd_context) { |
| *apiOut = API_OPENGL_CORE; |
| consts->ContextFlags |= GL_CONTEXT_FLAG_FORWARD_COMPATIBLE_BIT; |
| } else if (version >= 31 && !compat_context) { |
| *apiOut = API_OPENGL_CORE; |
| } else { |
| *apiOut = API_OPENGL_COMPAT; |
| } |
| } |
| |
| return true; |
| } |
| return false; |
| } |
| |
| void |
| _mesa_override_gl_version(struct gl_context *ctx) |
| { |
| if (_mesa_override_gl_version_contextless(&ctx->Const, &ctx->API, |
| &ctx->Version)) { |
| /* We need to include API in version string for OpenGL ES, otherwise |
| * application can not detect GLES via glGetString(GL_VERSION) query. |
| * |
| * From OpenGL ES 3.2 spec, Page 436: |
| * |
| * "The VERSION string is laid out as follows: |
| * |
| * OpenGL ES N.M vendor-specific information" |
| * |
| * From OpenGL 4.5 spec, Page 538: |
| * |
| * "The VERSION and SHADING_LANGUAGE_VERSION strings are laid out as |
| * follows: |
| * |
| * <version number><space><vendor-specific information>" |
| */ |
| create_version_string(ctx, _mesa_is_gles(ctx) ? "OpenGL ES " : ""); |
| ctx->Extensions.Version = ctx->Version; |
| } |
| } |
| |
| /** |
| * Override the context's GLSL version if the environment variable |
| * MESA_GLSL_VERSION_OVERRIDE is set. Valid values for |
| * MESA_GLSL_VERSION_OVERRIDE are integers, such as "130". |
| */ |
| void |
| _mesa_override_glsl_version(struct gl_constants *consts) |
| { |
| const char *env_var = "MESA_GLSL_VERSION_OVERRIDE"; |
| const char *version; |
| int n; |
| |
| version = getenv(env_var); |
| if (!version) { |
| return; |
| } |
| |
| n = sscanf(version, "%u", &consts->GLSLVersion); |
| if (n != 1) { |
| fprintf(stderr, "error: invalid value for %s: %s\n", env_var, version); |
| return; |
| } |
| } |
| |
| /** |
| * Examine enabled GL extensions to determine GL version. |
| */ |
| static GLuint |
| compute_version(const struct gl_extensions *extensions, |
| const struct gl_constants *consts, gl_api api) |
| { |
| GLuint major, minor, version; |
| |
| const bool ver_1_3 = (extensions->ARB_texture_border_clamp && |
| extensions->ARB_texture_cube_map && |
| extensions->ARB_texture_env_combine && |
| extensions->ARB_texture_env_dot3); |
| const bool ver_1_4 = (ver_1_3 && |
| extensions->ARB_depth_texture && |
| extensions->ARB_shadow && |
| extensions->ARB_texture_env_crossbar && |
| 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_occlusion_query); |
| const bool ver_2_0 = (ver_1_5 && |
| extensions->ARB_point_sprite && |
| extensions->ARB_vertex_shader && |
| extensions->ARB_fragment_shader && |
| extensions->ARB_texture_non_power_of_two && |
| extensions->EXT_blend_equation_separate && |
| |
| /* Technically, 2.0 requires the functionality of the |
| * EXT version. Enable 2.0 if either extension is |
| * available, and assume that a driver that only |
| * exposes the ATI extension will fallback to |
| * software when necessary. |
| */ |
| (extensions->EXT_stencil_two_side |
| || extensions->ATI_separate_stencil)); |
| const bool ver_2_1 = (ver_2_0 && |
| extensions->EXT_pixel_buffer_object && |
| 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_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->EXT_draw_buffers2 && |
| extensions->ARB_framebuffer_object && |
| extensions->EXT_framebuffer_sRGB && |
| extensions->EXT_packed_float && |
| extensions->EXT_texture_array && |
| extensions->EXT_texture_shared_exponent && |
| extensions->EXT_transform_feedback && |
| extensions->NV_conditional_render); |
| 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->NV_primitive_restart && |
| extensions->NV_texture_rectangle && |
| consts->Program[MESA_SHADER_VERTEX].MaxTextureImageUnits >= 16); |
| const bool ver_3_2 = (ver_3_1 && |
| consts->GLSLVersion >= 150 && |
| extensions->ARB_depth_clamp && |
| 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_texture_multisample && |
| extensions->EXT_vertex_array_bgra); |
| 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_timer_query && |
| extensions->ARB_vertex_type_2_10_10_10_rev && |
| extensions->EXT_texture_swizzle); |
| /* ARB_sampler_objects is always enabled in mesa */ |
| |
| 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_shader_subroutine && |
| extensions->ARB_tessellation_shader && |
| 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); |
| 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); |
| const bool ver_4_3 = (ver_4_2 && |
| consts->GLSLVersion >= 430 && |
| extensions->ARB_ES3_compatibility && |
| extensions->ARB_arrays_of_arrays && |
| extensions->ARB_compute_shader && |
| 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); |
| 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); |
| |
| if (ver_4_5) { |
| major = 4; |
| minor = 5; |
| } |
| else if (ver_4_4) { |
| major = 4; |
| minor = 4; |
| } |
| else if (ver_4_3) { |
| major = 4; |
| minor = 3; |
| } |
| else if (ver_4_2) { |
| major = 4; |
| minor = 2; |
| } |
| else if (ver_4_1) { |
| major = 4; |
| minor = 1; |
| } |
| else if (ver_4_0) { |
| major = 4; |
| minor = 0; |
| } |
| else if (ver_3_3) { |
| major = 3; |
| minor = 3; |
| } |
| else if (ver_3_2) { |
| major = 3; |
| minor = 2; |
| } |
| else if (ver_3_1) { |
| major = 3; |
| minor = 1; |
| } |
| else if (ver_3_0) { |
| major = 3; |
| minor = 0; |
| } |
| else if (ver_2_1) { |
| major = 2; |
| minor = 1; |
| } |
| else if (ver_2_0) { |
| major = 2; |
| minor = 0; |
| } |
| else if (ver_1_5) { |
| major = 1; |
| minor = 5; |
| } |
| else if (ver_1_4) { |
| major = 1; |
| minor = 4; |
| } |
| else if (ver_1_3) { |
| major = 1; |
| minor = 3; |
| } |
| else { |
| major = 1; |
| minor = 2; |
| } |
| |
| version = major * 10 + minor; |
| |
| if (api == API_OPENGL_CORE && version < 31) |
| return 0; |
| |
| return version; |
| } |
| |
| static GLuint |
| compute_version_es1(const struct gl_extensions *extensions) |
| { |
| /* OpenGL ES 1.0 is derived from OpenGL 1.3 */ |
| const bool ver_1_0 = (extensions->ARB_texture_env_combine && |
| extensions->ARB_texture_env_dot3); |
| /* OpenGL ES 1.1 is derived from OpenGL 1.5 */ |
| const bool ver_1_1 = (ver_1_0 && |
| extensions->EXT_point_parameters); |
| |
| if (ver_1_1) { |
| return 11; |
| } else if (ver_1_0) { |
| return 10; |
| } else { |
| return 0; |
| } |
| } |
| |
| static GLuint |
| compute_version_es2(const struct gl_extensions *extensions, |
| const struct gl_constants *consts) |
| { |
| /* OpenGL ES 2.0 is derived from OpenGL 2.0 */ |
| const bool ver_2_0 = (extensions->ARB_texture_cube_map && |
| extensions->EXT_blend_color && |
| extensions->EXT_blend_func_separate && |
| extensions->EXT_blend_minmax && |
| extensions->ARB_vertex_shader && |
| extensions->ARB_fragment_shader && |
| extensions->ARB_texture_non_power_of_two && |
| extensions->EXT_blend_equation_separate); |
| /* FINISHME: This list isn't quite right. */ |
| const bool ver_3_0 = (extensions->ARB_half_float_vertex && |
| extensions->ARB_internalformat_query && |
| extensions->ARB_map_buffer_range && |
| extensions->ARB_shader_texture_lod && |
| extensions->ARB_texture_float && |
| extensions->ARB_texture_rg && |
| extensions->ARB_depth_buffer_float && |
| extensions->EXT_draw_buffers2 && |
| /* extensions->ARB_framebuffer_object && */ |
| extensions->EXT_framebuffer_sRGB && |
| extensions->EXT_packed_float && |
| extensions->EXT_texture_array && |
| extensions->EXT_texture_shared_exponent && |
| extensions->EXT_transform_feedback && |
| extensions->ARB_draw_instanced && |
| extensions->ARB_uniform_buffer_object && |
| extensions->EXT_texture_snorm && |
| extensions->NV_primitive_restart && |
| extensions->OES_depth_texture_cube_map); |
| const bool es31_compute_shader = |
| consts->MaxComputeWorkGroupInvocations >= 128; |
| const bool ver_3_1 = (ver_3_0 && |
| extensions->ARB_arrays_of_arrays && |
| es31_compute_shader && |
| extensions->ARB_draw_indirect && |
| extensions->ARB_explicit_uniform_location && |
| extensions->ARB_framebuffer_no_attachments && |
| extensions->ARB_shader_atomic_counters && |
| extensions->ARB_shader_image_load_store && |
| extensions->ARB_shader_image_size && |
| extensions->ARB_shader_storage_buffer_object && |
| extensions->ARB_shading_language_packing && |
| extensions->ARB_stencil_texturing && |
| extensions->ARB_texture_multisample && |
| extensions->ARB_gpu_shader5 && |
| extensions->EXT_shader_integer_mix); |
| const bool ver_3_2 = (ver_3_1 && |
| extensions->KHR_blend_equation_advanced && |
| extensions->KHR_robustness && |
| extensions->KHR_texture_compression_astc_ldr && |
| extensions->OES_copy_image && |
| extensions->ARB_draw_buffers_blend && |
| extensions->ARB_draw_elements_base_vertex && |
| extensions->OES_geometry_shader && |
| extensions->OES_primitive_bounding_box && |
| extensions->OES_sample_variables && |
| extensions->ARB_tessellation_shader && |
| extensions->ARB_texture_border_clamp && |
| extensions->OES_texture_buffer && |
| extensions->OES_texture_cube_map_array && |
| extensions->ARB_texture_stencil8); |
| |
| if (ver_3_2) { |
| return 32; |
| } else if (ver_3_1) { |
| return 31; |
| } else if (ver_3_0) { |
| return 30; |
| } else if (ver_2_0) { |
| return 20; |
| } else { |
| return 0; |
| } |
| } |
| |
| GLuint |
| _mesa_get_version(const struct gl_extensions *extensions, |
| struct gl_constants *consts, gl_api api) |
| { |
| switch (api) { |
| case API_OPENGL_COMPAT: |
| /* Disable GLSL 1.40 and later for legacy contexts. |
| * This disallows creation of the GL 3.1 compatibility context. */ |
| if (!consts->AllowHigherCompatVersion) { |
| if (consts->GLSLVersion > 130) { |
| consts->GLSLVersion = 130; |
| } |
| } |
| /* fall through */ |
| case API_OPENGL_CORE: |
| return compute_version(extensions, consts, api); |
| case API_OPENGLES: |
| return compute_version_es1(extensions); |
| case API_OPENGLES2: |
| return compute_version_es2(extensions, consts); |
| } |
| return 0; |
| } |
| |
| /** |
| * Set the context's Version and VersionString fields. |
| * This should only be called once as part of context initialization |
| * or to perform version check for GLX_ARB_create_context_profile. |
| */ |
| void |
| _mesa_compute_version(struct gl_context *ctx) |
| { |
| if (ctx->Version) |
| return; |
| |
| ctx->Version = _mesa_get_version(&ctx->Extensions, &ctx->Const, ctx->API); |
| ctx->Extensions.Version = ctx->Version; |
| |
| /* Make sure that the GLSL version lines up with the GL version. In some |
| * cases it can be too high, e.g. if an extension is missing. |
| */ |
| if (ctx->API == API_OPENGL_CORE) { |
| switch (ctx->Version) { |
| case 31: |
| ctx->Const.GLSLVersion = 140; |
| break; |
| case 32: |
| ctx->Const.GLSLVersion = 150; |
| break; |
| default: |
| ctx->Const.GLSLVersion = ctx->Version * 10; |
| break; |
| } |
| } |
| |
| switch (ctx->API) { |
| case API_OPENGL_COMPAT: |
| case API_OPENGL_CORE: |
| create_version_string(ctx, ""); |
| break; |
| |
| case API_OPENGLES: |
| if (!ctx->Version) { |
| _mesa_problem(ctx, "Incomplete OpenGL ES 1.0 support."); |
| return; |
| } |
| create_version_string(ctx, "OpenGL ES-CM "); |
| break; |
| |
| case API_OPENGLES2: |
| if (!ctx->Version) { |
| _mesa_problem(ctx, "Incomplete OpenGL ES 2.0 support."); |
| return; |
| } |
| create_version_string(ctx, "OpenGL ES "); |
| break; |
| } |
| } |
