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  * Scans 'string' to see if it ends with 'ending'.
  32  */
  33 static GLboolean
  34 check_for_ending(char *string, const char *ending)
  35 {
  36    int len1, len2;
  37
  38    len1 = strlen(string);
  39    len2 = strlen(ending);
  40
  41    if (len2 > len1) {
  42       return GL_FALSE;
  43    }
  44
  45    if (strcmp(string + (len1 - len2), ending) == 0) {
  46       return GL_TRUE;
  47    } else {
  48       return GL_FALSE;
  49    }
  50 }
  51
  52 /**
  53  * Builds the MESA version string.
  54  */
  55 static void
  56 create_version_string(struct gl_context *ctx, const char *prefix)
  57 {
  58    static const int max = 100;
  59
  60    ctx->VersionString = malloc(max);
  61    if (ctx->VersionString) {
  62       _mesa_snprintf(ctx->VersionString, max,
  63                      "%s%u.%u%s Mesa " MESA_VERSION_STRING
  64 #ifdef MESA_GIT_SHA1
  65                      " (" MESA_GIT_SHA1 ")"
  66 #endif
  67                      ,
  68                      prefix,
  69                      ctx->Version / 10, ctx->Version % 10,
  70                      (ctx->API == API_OPENGL_CORE) ? " (Core Profile)" : ""
  71                      );
  72    }
  73 }
  74
  75 /**
  76  * Override the context's version and/or API type if the
  77  * environment variable MESA_GL_VERSION_OVERRIDE is set.
  78  *
  79  * Example uses of MESA_GL_VERSION_OVERRIDE:
  80  *
  81  * 2.1: select a compatibility (non-Core) profile with GL version 2.1
  82  * 3.0: select a compatibility (non-Core) profile with GL version 3.0
  83  * 3.0FC: select a Core+Forward Compatible profile with GL version 3.0
  84  * 3.1: select a Core profile with GL version 3.1
  85  * 3.1FC: select a Core+Forward Compatible profile with GL version 3.1
  86  */
  87 void
  88 _mesa_override_gl_version(struct gl_context *ctx)
  89 {
  90    const char *env_var = "MESA_GL_VERSION_OVERRIDE";
  91    const char *version;
  92    int n;
  93    int major, minor;
  94    GLboolean fc_suffix;
  95
  96    version = getenv(env_var);
  97    if (!version) {
  98       return;
  99    }
 100
 101    fc_suffix = check_for_ending(version, "FC");
 102
 103    n = sscanf(version, "%u.%u", &major, &minor);
 104    if (n != 2) {
 105       fprintf(stderr, "error: invalid value for %s: %s\n", env_var, version);
 106    } else {
 107       ctx->Version = major * 10 + minor;
 108       if (ctx->Version < 30 && fc_suffix) {
 109          fprintf(stderr, "error: invalid value for %s: %s\n", env_var, version);
 110       } else {
 111          if (ctx->Version >= 30 && fc_suffix) {
 112             ctx->API = API_OPENGL_CORE;
 113             ctx->Const.ContextFlags |= GL_CONTEXT_FLAG_FORWARD_COMPATIBLE_BIT;
 114          } else if (ctx->Version >= 31) {
 115             ctx->API = API_OPENGL_CORE;
 116          } else {
 117             ctx->API = API_OPENGL;
 118          }
 119          create_version_string(ctx, "");
 120       }
 121    }
 122 }
 123
 124 /**
 125  * Override the context's GLSL version if the environment variable
 126  * MESA_GLSL_VERSION_OVERRIDE is set. Valid values for
 127  * MESA_GLSL_VERSION_OVERRIDE are integers, such as "130".
 128  */
 129 void
 130 _mesa_override_glsl_version(struct gl_context *ctx)
 131 {
 132    const char *env_var = "MESA_GLSL_VERSION_OVERRIDE";
 133    const char *version;
 134    int n;
 135
 136    version = getenv(env_var);
 137    if (!version) {
 138       return;
 139    }
 140
 141    n = sscanf(version, "%u", &ctx->Const.GLSLVersion);
 142    if (n != 1) {
 143       fprintf(stderr, "error: invalid value for %s: %s\n", env_var, version);
 144       return;
 145    }
 146 }
 147
 148 /**
 149  * Examine enabled GL extensions to determine GL version.
 150  */
 151 static void
 152 compute_version(struct gl_context *ctx)
 153 {
 154    GLuint major, minor;
 155
 156    const GLboolean ver_1_3 = (ctx->Extensions.ARB_texture_border_clamp &&
 157                               ctx->Extensions.ARB_texture_cube_map &&
 158                               ctx->Extensions.ARB_texture_env_combine &&
 159                               ctx->Extensions.ARB_texture_env_dot3);
 160    const GLboolean ver_1_4 = (ver_1_3 &&
 161                               ctx->Extensions.ARB_depth_texture &&
 162                               ctx->Extensions.ARB_shadow &&
 163                               ctx->Extensions.ARB_texture_env_crossbar &&
 164                               ctx->Extensions.ARB_window_pos &&
 165                               ctx->Extensions.EXT_blend_color &&
 166                               ctx->Extensions.EXT_blend_func_separate &&
 167                               ctx->Extensions.EXT_blend_minmax &&
 168                               ctx->Extensions.EXT_fog_coord &&
 169                               ctx->Extensions.EXT_point_parameters &&
 170                               ctx->Extensions.EXT_secondary_color);
 171    const GLboolean ver_1_5 = (ver_1_4 &&
 172                               ctx->Extensions.ARB_occlusion_query &&
 173                               ctx->Extensions.EXT_shadow_funcs);
 174    const GLboolean ver_2_0 = (ver_1_5 &&
 175                               ctx->Extensions.ARB_point_sprite &&
 176                               ctx->Extensions.ARB_shader_objects &&
 177                               ctx->Extensions.ARB_vertex_shader &&
 178                               ctx->Extensions.ARB_fragment_shader &&
 179                               ctx->Extensions.ARB_texture_non_power_of_two &&
 180                               ctx->Extensions.EXT_blend_equation_separate &&
 181
 182                               /* Technically, 2.0 requires the functionality
 183                                * of the EXT version.  Enable 2.0 if either
 184                                * extension is available, and assume that a
 185                                * driver that only exposes the ATI extension
 186                                * will fallback to software when necessary.
 187                                */
 188                               (ctx->Extensions.EXT_stencil_two_side
 189                                || ctx->Extensions.ATI_separate_stencil));
 190    const GLboolean ver_2_1 = (ver_2_0 &&
 191                               ctx->Const.GLSLVersion >= 120 &&
 192                               ctx->Extensions.EXT_pixel_buffer_object &&
 193                               ctx->Extensions.EXT_texture_sRGB);
 194    const GLboolean ver_3_0 = (ver_2_1 &&
 195                               ctx->Const.GLSLVersion >= 130 &&
 196                               ctx->Const.MaxSamples >= 4 &&
 197                               ctx->Extensions.ARB_color_buffer_float &&
 198                               ctx->Extensions.ARB_depth_buffer_float &&
 199                               ctx->Extensions.ARB_half_float_pixel &&
 200                               ctx->Extensions.ARB_half_float_vertex &&
 201                               ctx->Extensions.ARB_map_buffer_range &&
 202                               ctx->Extensions.ARB_shader_texture_lod &&
 203                               ctx->Extensions.ARB_texture_float &&
 204                               ctx->Extensions.ARB_texture_rg &&
 205                               ctx->Extensions.ARB_texture_compression_rgtc &&
 206                               ctx->Extensions.EXT_draw_buffers2 &&
 207                               ctx->Extensions.ARB_framebuffer_object &&
 208                               ctx->Extensions.EXT_framebuffer_sRGB &&
 209                               ctx->Extensions.EXT_packed_float &&
 210                               ctx->Extensions.EXT_texture_array &&
 211                               ctx->Extensions.EXT_texture_shared_exponent &&
 212                               ctx->Extensions.EXT_transform_feedback &&
 213                               ctx->Extensions.NV_conditional_render);
 214    const GLboolean ver_3_1 = (ver_3_0 &&
 215                               ctx->Const.GLSLVersion >= 140 &&
 216                               ctx->Extensions.ARB_copy_buffer &&
 217                               ctx->Extensions.ARB_draw_instanced &&
 218                               ctx->Extensions.ARB_texture_buffer_object &&
 219                               ctx->Extensions.ARB_uniform_buffer_object &&
 220                               ctx->Extensions.EXT_texture_snorm &&
 221                               ctx->Extensions.NV_primitive_restart &&
 222                               ctx->Extensions.NV_texture_rectangle &&
 223                               ctx->Const.MaxVertexTextureImageUnits >= 16);
 224    const GLboolean ver_3_2 = (ver_3_1 &&
 225                               ctx->Const.GLSLVersion >= 150 &&
 226                               ctx->Extensions.ARB_depth_clamp &&
 227                               ctx->Extensions.ARB_draw_elements_base_vertex &&
 228                               ctx->Extensions.ARB_fragment_coord_conventions &&
 229                               ctx->Extensions.ARB_geometry_shader4 &&
 230                               ctx->Extensions.EXT_provoking_vertex &&
 231                               ctx->Extensions.ARB_seamless_cube_map &&
 232                               ctx->Extensions.ARB_sync &&
 233                               ctx->Extensions.ARB_texture_multisample &&
 234                               ctx->Extensions.EXT_vertex_array_bgra);
 235    const GLboolean ver_3_3 = (ver_3_2 &&
 236                               ctx->Const.GLSLVersion >= 330 &&
 237                               ctx->Extensions.ARB_blend_func_extended &&
 238                               ctx->Extensions.ARB_explicit_attrib_location &&
 239                               ctx->Extensions.ARB_instanced_arrays &&
 240                               ctx->Extensions.ARB_occlusion_query2 &&
 241                               ctx->Extensions.ARB_shader_bit_encoding &&
 242                               ctx->Extensions.ARB_texture_rgb10_a2ui &&
 243                               ctx->Extensions.ARB_timer_query &&
 244                               ctx->Extensions.ARB_vertex_type_2_10_10_10_rev &&
 245                               ctx->Extensions.EXT_texture_swizzle);
 246                               /* ARB_sampler_objects is always enabled in mesa */
 247
 248    if (ver_3_3) {
 249       major = 3;
 250       minor = 3;
 251    }
 252    else if (ver_3_2) {
 253       major = 3;
 254       minor = 2;
 255    }
 256    else if (ver_3_1) {
 257       major = 3;
 258       minor = 1;
 259    }
 260    else if (ver_3_0) {
 261       major = 3;
 262       minor = 0;
 263    }
 264    else if (ver_2_1) {
 265       major = 2;
 266       minor = 1;
 267    }
 268    else if (ver_2_0) {
 269       major = 2;
 270       minor = 0;
 271    }
 272    else if (ver_1_5) {
 273       major = 1;
 274       minor = 5;
 275    }
 276    else if (ver_1_4) {
 277       major = 1;
 278       minor = 4;
 279    }
 280    else if (ver_1_3) {
 281       major = 1;
 282       minor = 3;
 283    }
 284    else {
 285       major = 1;
 286       minor = 2;
 287    }
 288
 289    ctx->Version = major * 10 + minor;
 290
 291    create_version_string(ctx, "");
 292 }
 293
 294 static void
 295 compute_version_es1(struct gl_context *ctx)
 296 {
 297    /* OpenGL ES 1.0 is derived from OpenGL 1.3 */
 298    const GLboolean ver_1_0 = (ctx->Extensions.ARB_texture_env_combine &&
 299                               ctx->Extensions.ARB_texture_env_dot3);
 300    /* OpenGL ES 1.1 is derived from OpenGL 1.5 */
 301    const GLboolean ver_1_1 = (ver_1_0 &&
 302                               ctx->Extensions.EXT_point_parameters);
 303
 304    if (ver_1_1) {
 305       ctx->Version = 11;
 306    } else if (ver_1_0) {
 307       ctx->Version = 10;
 308    } else {
 309       _mesa_problem(ctx, "Incomplete OpenGL ES 1.0 support.");
 310    }
 311
 312    create_version_string(ctx, "OpenGL ES-CM ");
 313 }
 314
 315 static void
 316 compute_version_es2(struct gl_context *ctx)
 317 {
 318    /* OpenGL ES 2.0 is derived from OpenGL 2.0 */
 319    const GLboolean ver_2_0 = (ctx->Extensions.ARB_texture_cube_map &&
 320                               ctx->Extensions.EXT_blend_color &&
 321                               ctx->Extensions.EXT_blend_func_separate &&
 322                               ctx->Extensions.EXT_blend_minmax &&
 323                               ctx->Extensions.ARB_shader_objects &&
 324                               ctx->Extensions.ARB_vertex_shader &&
 325                               ctx->Extensions.ARB_fragment_shader &&
 326                               ctx->Extensions.ARB_texture_non_power_of_two &&
 327                               ctx->Extensions.EXT_blend_equation_separate);
 328    if (ver_2_0) {
 329       ctx->Version = 20;
 330    } else {
 331       _mesa_problem(ctx, "Incomplete OpenGL ES 2.0 support.");
 332    }
 333
 334    create_version_string(ctx, "OpenGL ES ");
 335 }
 336
 337 /**
 338  * Set the context's Version and VersionString fields.
 339  * This should only be called once as part of context initialization
 340  * or to perform version check for GLX_ARB_create_context_profile.
 341  */
 342 void
 343 _mesa_compute_version(struct gl_context *ctx)
 344 {
 345    if (ctx->Version)
 346       return;
 347
 348    switch (ctx->API) {
 349    case API_OPENGL:
 350    case API_OPENGL_CORE:
 351       compute_version(ctx);
 352       break;
 353    case API_OPENGLES:
 354       compute_version_es1(ctx);
 355       break;
 356    case API_OPENGLES2:
 357       compute_version_es2(ctx);
 358       break;
 359    }
 360
 361 }