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90 lines
2.7 KiB
C
90 lines
2.7 KiB
C
/*
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* Mesa 3-D graphics library
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*
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* Copyright (C) 2010 VMware, Inc. All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included
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* in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
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* AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include <precomp.h>
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#include "git_sha1.h"
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/**
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* Override the context's GL version if the environment variable
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* MESA_GL_VERSION_OVERRIDE is set. Valid values of MESA_GL_VERSION_OVERRIDE
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* are point-separated version numbers, such as "3.0".
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*/
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static void
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override_version(struct gl_context *ctx, GLuint *major, GLuint *minor)
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{
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const char *env_var = "MESA_GL_VERSION_OVERRIDE";
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const char *version;
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int n;
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version = getenv(env_var);
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if (!version) {
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return;
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}
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n = sscanf(version, "%u.%u", major, minor);
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if (n != 2) {
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fprintf(stderr, "error: invalid value for %s: %s\n", env_var, version);
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return;
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}
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}
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/**
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* Examine enabled GL extensions to determine GL version.
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* Return major and minor version numbers.
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*/
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static void
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compute_version(struct gl_context *ctx)
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{
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/* report openGL 1.1 */
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ctx->VersionMajor = 1;
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ctx->VersionMinor = 1;
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override_version(ctx, &ctx->VersionMajor, &ctx->VersionMinor);
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ctx->VersionString = (char *) malloc(20);
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if (ctx->VersionString) {
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_mesa_snprintf(ctx->VersionString, 20,
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"%u.%u Mesa " MESA_VERSION_STRING
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#ifdef MESA_GIT_SHA1
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" (" MESA_GIT_SHA1 ")"
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#endif
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,
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ctx->VersionMajor, ctx->VersionMinor);
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}
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}
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/**
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* Set the context's VersionMajor, VersionMinor, VersionString fields.
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* This should only be called once as part of context initialization
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* or to perform version check for GLX_ARB_create_context_profile.
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*/
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void
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_mesa_compute_version(struct gl_context *ctx)
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{
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if (ctx->VersionMajor)
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return;
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compute_version(ctx);
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}
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