src/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
  25 #include "context.h"
  26 #include "version.h"
  27
  28
  29
  30 /**
  31  * Examine enabled GL extensions to determine GL version.
  32  * Return major and minor version numbers.
  33  */
  34 static void
  35 compute_version(const GLcontext *ctx, GLuint *major, GLuint *minor)
  36 {
  37    const GLboolean ver_1_3 = (ctx->Extensions.ARB_multisample &&
  38                               ctx->Extensions.ARB_multitexture &&
  39                               ctx->Extensions.ARB_texture_border_clamp &&
  40                               ctx->Extensions.ARB_texture_compression &&
  41                               ctx->Extensions.ARB_texture_cube_map &&
  42                               ctx->Extensions.EXT_texture_env_add &&
  43                               ctx->Extensions.ARB_texture_env_combine &&
  44                               ctx->Extensions.ARB_texture_env_dot3);
  45    const GLboolean ver_1_4 = (ver_1_3 &&
  46                               ctx->Extensions.ARB_depth_texture &&
  47                               ctx->Extensions.ARB_shadow &&
  48                               ctx->Extensions.ARB_texture_env_crossbar &&
  49                               ctx->Extensions.ARB_texture_mirrored_repeat &&
  50                               ctx->Extensions.ARB_window_pos &&
  51                               ctx->Extensions.EXT_blend_color &&
  52                               ctx->Extensions.EXT_blend_func_separate &&
  53                               ctx->Extensions.EXT_blend_minmax &&
  54                               ctx->Extensions.EXT_blend_subtract &&
  55                               ctx->Extensions.EXT_fog_coord &&
  56                               ctx->Extensions.EXT_multi_draw_arrays &&
  57                               ctx->Extensions.EXT_point_parameters &&
  58                               ctx->Extensions.EXT_secondary_color &&
  59                               ctx->Extensions.EXT_stencil_wrap &&
  60                               ctx->Extensions.EXT_texture_lod_bias &&
  61                               ctx->Extensions.SGIS_generate_mipmap);
  62    const GLboolean ver_1_5 = (ver_1_4 &&
  63                               ctx->Extensions.ARB_occlusion_query &&
  64                               ctx->Extensions.ARB_vertex_buffer_object &&
  65                               ctx->Extensions.EXT_shadow_funcs);
  66    const GLboolean ver_2_0 = (ver_1_5 &&
  67                               ctx->Extensions.ARB_draw_buffers &&
  68                               ctx->Extensions.ARB_point_sprite &&
  69                               ctx->Extensions.ARB_shader_objects &&
  70                               ctx->Extensions.ARB_vertex_shader &&
  71                               ctx->Extensions.ARB_fragment_shader &&
  72                               ctx->Extensions.ARB_texture_non_power_of_two &&
  73                               ctx->Extensions.EXT_blend_equation_separate &&
  74
  75                               /* Technically, 2.0 requires the functionality
  76                                * of the EXT version.  Enable 2.0 if either
  77                                * extension is available, and assume that a
  78                                * driver that only exposes the ATI extension
  79                                * will fallback to software when necessary.
  80                                */
  81                               (ctx->Extensions.EXT_stencil_two_side
  82                                || ctx->Extensions.ATI_separate_stencil));
  83    const GLboolean ver_2_1 = (ver_2_0 &&
  84                               ctx->Extensions.ARB_shading_language_120 &&
  85                               ctx->Extensions.EXT_pixel_buffer_object &&
  86                               ctx->Extensions.EXT_texture_sRGB);
  87    if (ver_2_1) {
  88       *major = 2;
  89       *minor = 1;
  90    }
  91    else if (ver_2_0) {
  92       *major = 2;
  93       *minor = 0;
  94    }
  95    else if (ver_1_5) {
  96       *major = 1;
  97       *minor = 5;
  98    }
  99    else if (ver_1_4) {
 100       *major = 1;
 101       *minor = 4;
 102    }
 103    else if (ver_1_3) {
 104       *major = 1;
 105       *minor = 3;
 106    }
 107    else {
 108       *major = 1;
 109       *minor = 2;
 110    }
 111 }
 112
 113
 114 /**
 115  * Set the context's VersionMajor, VersionMinor, VersionString fields.
 116  * This should only be called once as part of context initialization.
 117  */
 118 void
 119 _mesa_compute_version(GLcontext *ctx)
 120 {
 121    static const int max = 100;
 122
 123    compute_version(ctx, &ctx->VersionMajor, &ctx->VersionMinor);
 124
 125    ctx->VersionString = (char *) _mesa_malloc(max);
 126    if (ctx->VersionString) {
 127       _mesa_snprintf(ctx->VersionString, max, "%u.%u Mesa " MESA_VERSION_STRING,
 128                      ctx->VersionMajor, ctx->VersionMinor);
 129    }
 130 }