dll/opengl/mesa/main/version.c

   1 /*
   2  * Mesa 3-D graphics library
   3  *
   4  * Copyright (C) 2010  VMware, Inc.  All Rights Reserved.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the "Software"),
   8  * to deal in the Software without restriction, including without limitation
   9  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  10  * and/or sell copies of the Software, and to permit persons to whom the
  11  * Software is furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included
  14  * in all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  17  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  19  * THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  20  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  21  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  22  */
  23
  24 #include <precomp.h>
  25
  26 #include "git_sha1.h"
  27
  28 /**
  29  * Override the context's GL version if the environment variable
  30  * MESA_GL_VERSION_OVERRIDE is set. Valid values of MESA_GL_VERSION_OVERRIDE
  31  * are point-separated version numbers, such as "3.0".
  32  */
  33 static void
  34 override_version(struct gl_context *ctx, GLuint *major, GLuint *minor)
  35 {
  36    const char *env_var = "MESA_GL_VERSION_OVERRIDE";
  37    const char *version;
  38    int n;
  39
  40    version = getenv(env_var);
  41    if (!version) {
  42       return;
  43    }
  44
  45    n = sscanf(version, "%u.%u", major, minor);
  46    if (n != 2) {
  47       fprintf(stderr, "error: invalid value for %s: %s\n", env_var, version);
  48       return;
  49    }
  50 }
  51
  52 /**
  53  * Examine enabled GL extensions to determine GL version.
  54  * Return major and minor version numbers.
  55  */
  56 static void
  57 compute_version(struct gl_context *ctx)
  58 {
  59     /* report openGL 1.1 */
  60     ctx->VersionMajor = 1;
  61     ctx->VersionMinor = 1;
  62
  63     override_version(ctx, &ctx->VersionMajor, &ctx->VersionMinor);
  64
  65     ctx->VersionString = (char *) malloc(20);
  66     if (ctx->VersionString) {
  67         _mesa_snprintf(ctx->VersionString, 20,
  68             "%u.%u Mesa " MESA_VERSION_STRING
  69 #ifdef MESA_GIT_SHA1
  70             " (" MESA_GIT_SHA1 ")"
  71 #endif
  72          ,
  73          ctx->VersionMajor, ctx->VersionMinor);
  74     }
  75 }
  76
  77 /**
  78  * Set the context's VersionMajor, VersionMinor, VersionString fields.
  79  * This should only be called once as part of context initialization
  80  * or to perform version check for GLX_ARB_create_context_profile.
  81  */
  82 void
  83 _mesa_compute_version(struct gl_context *ctx)
  84 {
  85    if (ctx->VersionMajor)
  86       return;
  87
  88    compute_version(ctx);
  89 }