reactos/dll/opengl/mesa/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 "imports.h"
  26 #include "mtypes.h"
  27 #include "version.h"
  28 #include "git_sha1.h"
  29
  30 /**
  31  * Override the context's GL version if the environment variable
  32  * MESA_GL_VERSION_OVERRIDE is set. Valid values of MESA_GL_VERSION_OVERRIDE
  33  * are point-separated version numbers, such as "3.0".
  34  */
  35 static void
  36 override_version(struct gl_context *ctx, GLuint *major, GLuint *minor)
  37 {
  38    const char *env_var = "MESA_GL_VERSION_OVERRIDE";
  39    const char *version;
  40    int n;
  41
  42    version = getenv(env_var);
  43    if (!version) {
  44       return;
  45    }
  46
  47    n = sscanf(version, "%u.%u", major, minor);
  48    if (n != 2) {
  49       fprintf(stderr, "error: invalid value for %s: %s\n", env_var, version);
  50       return;
  51    }
  52 }
  53
  54 /**
  55  * Override the context's GLSL version if the environment variable
  56  * MESA_GLSL_VERSION_OVERRIDE is set. Valid values for
  57  * MESA_GLSL_VERSION_OVERRIDE are integers, such as "130".
  58  */
  59 void
  60 _mesa_override_glsl_version(struct gl_context *ctx)
  61 {
  62    const char *env_var = "MESA_GLSL_VERSION_OVERRIDE";
  63    const char *version;
  64    int n;
  65
  66    version = getenv(env_var);
  67    if (!version) {
  68       return;
  69    }
  70
  71    n = sscanf(version, "%u", &ctx->Const.GLSLVersion);
  72    if (n != 1) {
  73       fprintf(stderr, "error: invalid value for %s: %s\n", env_var, version);
  74       return;
  75    }
  76 }
  77
  78 /**
  79  * Examine enabled GL extensions to determine GL version.
  80  * Return major and minor version numbers.
  81  */
  82 static void
  83 compute_version(struct gl_context *ctx)
  84 {
  85    GLuint major, minor;
  86    static const int max = 100;
  87
  88    const GLboolean ver_1_3 = (ctx->Extensions.ARB_texture_border_clamp &&
  89                               ctx->Extensions.ARB_texture_cube_map &&
  90                               ctx->Extensions.ARB_texture_env_combine &&
  91                               ctx->Extensions.ARB_texture_env_dot3);
  92    const GLboolean ver_1_4 = (ver_1_3 &&
  93                               ctx->Extensions.ARB_texture_env_crossbar &&
  94                               ctx->Extensions.ARB_window_pos &&
  95                               ctx->Extensions.EXT_blend_color &&
  96                               ctx->Extensions.EXT_blend_func_separate &&
  97                               ctx->Extensions.EXT_blend_minmax &&
  98                               ctx->Extensions.EXT_fog_coord &&
  99                               ctx->Extensions.EXT_point_parameters &&
 100                               ctx->Extensions.EXT_secondary_color);
 101    const GLboolean ver_1_5 = (ver_1_4 &&
 102                               ctx->Extensions.EXT_shadow_funcs);
 103    const GLboolean ver_2_0 = (ver_1_5 &&
 104                               ctx->Extensions.ARB_point_sprite &&
 105                               ctx->Extensions.ARB_shader_objects &&
 106                               ctx->Extensions.ARB_vertex_shader &&
 107                               ctx->Extensions.ARB_fragment_shader &&
 108                               ctx->Extensions.ARB_texture_non_power_of_two &&
 109                               ctx->Extensions.EXT_blend_equation_separate &&
 110
 111                               /* Technically, 2.0 requires the functionality
 112                                * of the EXT version.  Enable 2.0 if either
 113                                * extension is available, and assume that a
 114                                * driver that only exposes the ATI extension
 115                                * will fallback to software when necessary.
 116                                */
 117                               (ctx->Extensions.EXT_stencil_two_side
 118                                || ctx->Extensions.ATI_separate_stencil));
 119    const GLboolean ver_2_1 = (ver_2_0 &&
 120                               ctx->Const.GLSLVersion >= 120 &&
 121                               ctx->Extensions.EXT_pixel_buffer_object &&
 122                               ctx->Extensions.EXT_texture_sRGB);
 123    const GLboolean ver_3_0 = (ver_2_1 &&
 124                               ctx->Const.GLSLVersion >= 130 &&
 125                               ctx->Const.MaxSamples >= 4 &&
 126                               ctx->Extensions.ARB_color_buffer_float &&
 127                               ctx->Extensions.ARB_depth_buffer_float &&
 128                               ctx->Extensions.ARB_half_float_pixel &&
 129                               ctx->Extensions.ARB_half_float_vertex &&
 130                               ctx->Extensions.ARB_map_buffer_range &&
 131                               ctx->Extensions.ARB_shader_texture_lod &&
 132                               ctx->Extensions.ARB_texture_float &&
 133                               ctx->Extensions.APPLE_vertex_array_object &&
 134                               ctx->Extensions.ARB_framebuffer_object &&
 135                               ctx->Extensions.EXT_framebuffer_sRGB &&
 136                               ctx->Extensions.EXT_texture_array);
 137    const GLboolean ver_3_1 = (ver_3_0 &&
 138                               ctx->Const.GLSLVersion >= 140 &&
 139                               ctx->Extensions.ARB_copy_buffer &&
 140                               ctx->Extensions.ARB_draw_instanced &&
 141                               ctx->Extensions.ARB_texture_buffer_object &&
 142                               ctx->Extensions.ARB_uniform_buffer_object &&
 143                               ctx->Const.MaxVertexTextureImageUnits >= 16);
 144
 145
 146    if (ver_3_1) {
 147       major = 3;
 148       minor = 1;
 149    }
 150    else if (ver_3_0) {
 151       major = 3;
 152       minor = 0;
 153    }
 154    else if (ver_2_1) {
 155       major = 2;
 156       minor = 1;
 157    }
 158    else if (ver_2_0) {
 159       major = 2;
 160       minor = 0;
 161    }
 162    else if (ver_1_5) {
 163       major = 1;
 164       minor = 5;
 165    }
 166    else if (ver_1_4) {
 167       major = 1;
 168       minor = 4;
 169    }
 170    else if (ver_1_3) {
 171       major = 1;
 172       minor = 3;
 173    }
 174    else {
 175       major = 1;
 176       minor = 2;
 177    }
 178
 179    ctx->VersionMajor = major;
 180    ctx->VersionMinor = minor;
 181
 182    override_version(ctx, &ctx->VersionMajor, &ctx->VersionMinor);
 183
 184    ctx->VersionString = (char *) malloc(max);
 185    if (ctx->VersionString) {
 186       _mesa_snprintf(ctx->VersionString, max,
 187                      "%u.%u Mesa " MESA_VERSION_STRING
 188 #ifdef MESA_GIT_SHA1
 189                      " (" MESA_GIT_SHA1 ")"
 190 #endif
 191                      ,
 192                      ctx->VersionMajor, ctx->VersionMinor);
 193    }
 194 }
 195
 196 /**
 197  * Set the context's VersionMajor, VersionMinor, VersionString fields.
 198  * This should only be called once as part of context initialization
 199  * or to perform version check for GLX_ARB_create_context_profile.
 200  */
 201 void
 202 _mesa_compute_version(struct gl_context *ctx)
 203 {
 204    if (ctx->VersionMajor)
 205       return;
 206
 207    compute_version(ctx);
 208 }