/* * 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 "imports.h" #include "mtypes.h" #include "version.h" #include "git_sha1.h" /** * Scans 'string' to see if it ends with 'ending'. */ static GLboolean check_for_ending(const char *string, const char *ending) { int len1, len2; len1 = strlen(string); len2 = strlen(ending); if (len2 > len1) { return GL_FALSE; } if (strcmp(string + (len1 - len2), ending) == 0) { return GL_TRUE; } else { return GL_FALSE; } } /** * 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(int *version, GLboolean *fwd_context, GLboolean *compat_context) { const char *env_var = "MESA_GL_VERSION_OVERRIDE"; const char *version_str; int major, minor, n; static int override_version = -1; static GLboolean fc_suffix = GL_FALSE; static GLboolean compat_suffix = GL_FALSE; if (override_version < 0) { override_version = 0; version_str = getenv(env_var); if (version_str) { fc_suffix = check_for_ending(version_str, "FC"); 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_version = 0; } else { override_version = major * 10 + minor; if (override_version < 30 && fc_suffix) { fprintf(stderr, "error: invalid value for %s: %s\n", env_var, version_str); } } } } *version = override_version; *fwd_context = fc_suffix; *compat_context = 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; GLboolean fwd_context, compat_context; get_gl_override(&version, &fwd_context, &compat_context); if (version > 0) { *versionOut = version; 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 GL_TRUE; } return GL_FALSE; } void _mesa_override_gl_version(struct gl_context *ctx) { if (_mesa_override_gl_version_contextless(&ctx->Const, &ctx->API, &ctx->Version)) { create_version_string(ctx, ""); } } /** * Returns the gl override value * * version > 0 indicates there is an override requested */ int _mesa_get_gl_version_override(void) { int version; GLboolean fwd_context, compat_context; get_gl_override(&version, &fwd_context, &compat_context); return 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 GLboolean ver_1_3 = (extensions->ARB_texture_border_clamp && extensions->ARB_texture_cube_map && extensions->ARB_texture_env_combine && extensions->ARB_texture_env_dot3); const GLboolean 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 GLboolean ver_1_5 = (ver_1_4 && extensions->ARB_occlusion_query); const GLboolean 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 GLboolean ver_2_1 = (ver_2_0 && extensions->EXT_pixel_buffer_object && extensions->EXT_texture_sRGB); const GLboolean 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 GLboolean 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 GLboolean 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 GLboolean 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 */ 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 GLboolean ver_1_0 = (extensions->ARB_texture_env_combine && extensions->ARB_texture_env_dot3); /* OpenGL ES 1.1 is derived from OpenGL 1.5 */ const GLboolean 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) { /* OpenGL ES 2.0 is derived from OpenGL 2.0 */ const GLboolean 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 GLboolean 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->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); 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->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); } 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); 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; } }