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 OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
  20  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  21  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  22  * OTHER DEALINGS IN THE SOFTWARE.
  23  */
  24
  25
  26 #include <stdio.h>
  27 #include "context.h"
  28
  29 #include "mtypes.h"
  30 #include "version.h"
  31 #include "git_sha1.h"
  32
  33 /**
  34  * Scans 'string' to see if it ends with 'ending'.
  35  */
  36 static bool
  37 check_for_ending(const char *string, const char *ending)
  38 {
  39    const size_t len1 = strlen(string);
  40    const size_t len2 = strlen(ending);
  41
  42    if (len2 > len1)
  43       return false;
  44
  45    return strcmp(string + (len1 - len2), ending) == 0;
  46 }
  47
  48 /**
  49  * Returns the gl override data
  50  *
  51  * version > 0 indicates there is an override requested
  52  * fwd_context is only valid if version > 0
  53  */
  54 static void
  55 get_gl_override(gl_api api, int *version, bool *fwd_context,
  56                 bool *compat_context)
  57 {
  58    const char *env_var = (api == API_OPENGL_CORE || api == API_OPENGL_COMPAT)
  59       ? "MESA_GL_VERSION_OVERRIDE" : "MESA_GLES_VERSION_OVERRIDE";
  60    const char *version_str;
  61    int major, minor, n;
  62    static struct override_info {
  63       int version;
  64       bool fc_suffix;
  65       bool compat_suffix;
  66    } override[] = {
  67       [API_OPENGL_COMPAT] = { -1, false, false},
  68       [API_OPENGLES]      = { -1, false, false},
  69       [API_OPENGLES2]     = { -1, false, false},
  70       [API_OPENGL_CORE]   = { -1, false, false},
  71    };
  72
  73    STATIC_ASSERT(ARRAY_SIZE(override) == API_OPENGL_LAST + 1);
  74
  75    if (api == API_OPENGLES)
  76       goto exit;
  77
  78    if (override[api].version < 0) {
  79       override[api].version = 0;
  80
  81       version_str = getenv(env_var);
  82       if (version_str) {
  83          override[api].fc_suffix = check_for_ending(version_str, "FC");
  84          override[api].compat_suffix = check_for_ending(version_str, "COMPAT");
  85
  86          n = sscanf(version_str, "%u.%u", &major, &minor);
  87          if (n != 2) {
  88             fprintf(stderr, "error: invalid value for %s: %s\n",
  89                     env_var, version_str);
  90             override[api].version = 0;
  91          } else {
  92             override[api].version = major * 10 + minor;
  93
  94             /* There is no such thing as compatibility or forward-compatible for
  95              * OpenGL ES 2.0 or 3.x APIs.
  96              */
  97             if ((override[api].version < 30 && override[api].fc_suffix) ||
  98                 (api == API_OPENGLES2 && (override[api].fc_suffix ||
  99                                           override[api].compat_suffix))) {
 100                fprintf(stderr, "error: invalid value for %s: %s\n",
 101                        env_var, version_str);
 102             }
 103          }
 104       }
 105    }
 106
 107 exit:
 108    *version = override[api].version;
 109    *fwd_context = override[api].fc_suffix;
 110    *compat_context = override[api].compat_suffix;
 111 }
 112
 113 /**
 114  * Builds the Mesa version string.
 115  */
 116 static void
 117 create_version_string(struct gl_context *ctx, const char *prefix)
 118 {
 119    static const int max = 100;
 120
 121    ctx->VersionString = malloc(max);
 122    if (ctx->VersionString) {
 123       snprintf(ctx->VersionString, max,
 124                      "%s%u.%u%s Mesa " PACKAGE_VERSION MESA_GIT_SHA1,
 125                      prefix,
 126                      ctx->Version / 10, ctx->Version % 10,
 127                      (ctx->API == API_OPENGL_CORE) ? " (Core Profile)" :
 128                      (ctx->API == API_OPENGL_COMPAT && ctx->Version >= 32) ?
 129                         " (Compatibility Profile)" : ""
 130                      );
 131    }
 132 }
 133
 134 /**
 135  * Override the context's version and/or API type if the environment variables
 136  * MESA_GL_VERSION_OVERRIDE or MESA_GLES_VERSION_OVERRIDE are set.
 137  *
 138  * Example uses of MESA_GL_VERSION_OVERRIDE:
 139  *
 140  * 2.1: select a compatibility (non-Core) profile with GL version 2.1.
 141  * 3.0: select a compatibility (non-Core) profile with GL version 3.0.
 142  * 3.0FC: select a Core+Forward Compatible profile with GL version 3.0.
 143  * 3.1: select GL version 3.1 with GL_ARB_compatibility enabled per the driver default.
 144  * 3.1FC: select GL version 3.1 with forward compatibility and GL_ARB_compatibility disabled.
 145  * 3.1COMPAT: select GL version 3.1 with GL_ARB_compatibility enabled.
 146  * X.Y: override GL version to X.Y without changing the profile.
 147  * X.YFC: select a Core+Forward Compatible profile with GL version X.Y.
 148  * X.YCOMPAT: select a Compatibility profile with GL version X.Y.
 149  *
 150  * Example uses of MESA_GLES_VERSION_OVERRIDE:
 151  *
 152  * 2.0: select GLES version 2.0.
 153  * 3.0: select GLES version 3.0.
 154  * 3.1: select GLES version 3.1.
 155  */
 156 bool
 157 _mesa_override_gl_version_contextless(struct gl_constants *consts,
 158                                       gl_api *apiOut, GLuint *versionOut)
 159 {
 160    int version;
 161    bool fwd_context, compat_context;
 162
 163    get_gl_override(*apiOut, &version, &fwd_context, &compat_context);
 164
 165    if (version > 0) {
 166       *versionOut = version;
 167
 168       /* Modify the API and context flags as needed. */
 169       if (*apiOut == API_OPENGL_CORE || *apiOut == API_OPENGL_COMPAT) {
 170          if (version >= 30 && fwd_context) {
 171             *apiOut = API_OPENGL_CORE;
 172             consts->ContextFlags |= GL_CONTEXT_FLAG_FORWARD_COMPATIBLE_BIT;
 173          } else if (compat_context) {
 174             *apiOut = API_OPENGL_COMPAT;
 175          }
 176       }
 177
 178       return true;
 179    }
 180    return false;
 181 }
 182
 183 void
 184 _mesa_override_gl_version(struct gl_context *ctx)
 185 {
 186    if (_mesa_override_gl_version_contextless(&ctx->Const, &ctx->API,
 187                                              &ctx->Version)) {
 188       /* We need to include API in version string for OpenGL ES, otherwise
 189        * application can not detect GLES via glGetString(GL_VERSION) query.
 190        *
 191        * From OpenGL ES 3.2 spec, Page 436:
 192        *
 193        *     "The VERSION string is laid out as follows:
 194        *
 195        *     OpenGL ES N.M vendor-specific information"
 196        *
 197        * From OpenGL 4.5 spec, Page 538:
 198        *
 199        *     "The VERSION and SHADING_LANGUAGE_VERSION strings are laid out as
 200        *     follows:
 201        *
 202        *     <version number><space><vendor-specific information>"
 203        */
 204       create_version_string(ctx, _mesa_is_gles(ctx) ? "OpenGL ES " : "");
 205       ctx->Extensions.Version = ctx->Version;
 206    }
 207 }
 208
 209 /**
 210  * Override the context's GLSL version if the environment variable
 211  * MESA_GLSL_VERSION_OVERRIDE is set. Valid values for
 212  * MESA_GLSL_VERSION_OVERRIDE are integers, such as "130".
 213  */
 214 void
 215 _mesa_override_glsl_version(struct gl_constants *consts)
 216 {
 217    const char *env_var = "MESA_GLSL_VERSION_OVERRIDE";
 218    const char *version;
 219    int n;
 220
 221    version = getenv(env_var);
 222    if (!version) {
 223       return;
 224    }
 225
 226    n = sscanf(version, "%u", &consts->GLSLVersion);
 227    if (n != 1) {
 228       fprintf(stderr, "error: invalid value for %s: %s\n", env_var, version);
 229       return;
 230    }
 231 }
 232
 233 /**
 234  * Examine enabled GL extensions to determine GL version.
 235  */
 236 static GLuint
 237 compute_version(const struct gl_extensions *extensions,
 238                 const struct gl_constants *consts, gl_api api)
 239 {
 240    GLuint major, minor, version;
 241
 242    const bool ver_1_3 = (extensions->ARB_texture_border_clamp &&
 243                          extensions->ARB_texture_cube_map &&
 244                          extensions->ARB_texture_env_combine &&
 245                          extensions->ARB_texture_env_dot3);
 246    const bool ver_1_4 = (ver_1_3 &&
 247                          extensions->ARB_depth_texture &&
 248                          extensions->ARB_shadow &&
 249                          extensions->ARB_texture_env_crossbar &&
 250                          extensions->EXT_blend_color &&
 251                          extensions->EXT_blend_func_separate &&
 252                          extensions->EXT_blend_minmax &&
 253                          extensions->EXT_point_parameters);
 254    const bool ver_1_5 = (ver_1_4 &&
 255                          extensions->ARB_occlusion_query);
 256    const bool ver_2_0 = (ver_1_5 &&
 257                          extensions->ARB_point_sprite &&
 258                          extensions->ARB_vertex_shader &&
 259                          extensions->ARB_fragment_shader &&
 260                          extensions->ARB_texture_non_power_of_two &&
 261                          extensions->EXT_blend_equation_separate &&
 262                          extensions->EXT_stencil_two_side);
 263    const bool ver_2_1 = (ver_2_0 &&
 264                          extensions->EXT_pixel_buffer_object &&
 265                          extensions->EXT_texture_sRGB);
 266    const bool ver_3_0 = (ver_2_1 &&
 267                          consts->GLSLVersion >= 130 &&
 268                          (consts->MaxSamples >= 4 || consts->FakeSWMSAA) &&
 269                          (api == API_OPENGL_CORE ||
 270                           extensions->ARB_color_buffer_float) &&
 271                          extensions->ARB_depth_buffer_float &&
 272                          extensions->ARB_half_float_vertex &&
 273                          extensions->ARB_map_buffer_range &&
 274                          extensions->ARB_shader_texture_lod &&
 275                          extensions->ARB_texture_float &&
 276                          extensions->ARB_texture_rg &&
 277                          extensions->ARB_texture_compression_rgtc &&
 278                          extensions->EXT_draw_buffers2 &&
 279                          extensions->ARB_framebuffer_object &&
 280                          extensions->EXT_framebuffer_sRGB &&
 281                          extensions->EXT_packed_float &&
 282                          extensions->EXT_texture_array &&
 283                          extensions->EXT_texture_shared_exponent &&
 284                          extensions->EXT_transform_feedback &&
 285                          extensions->NV_conditional_render);
 286    const bool ver_3_1 = (ver_3_0 &&
 287                          consts->GLSLVersion >= 140 &&
 288                          extensions->ARB_draw_instanced &&
 289                          extensions->ARB_texture_buffer_object &&
 290                          extensions->ARB_uniform_buffer_object &&
 291                          extensions->EXT_texture_snorm &&
 292                          extensions->NV_primitive_restart &&
 293                          extensions->NV_texture_rectangle &&
 294                          consts->Program[MESA_SHADER_VERTEX].MaxTextureImageUnits >= 16);
 295    const bool ver_3_2 = (ver_3_1 &&
 296                          consts->GLSLVersion >= 150 &&
 297                          extensions->ARB_depth_clamp &&
 298                          extensions->ARB_draw_elements_base_vertex &&
 299                          extensions->ARB_fragment_coord_conventions &&
 300                          extensions->EXT_provoking_vertex &&
 301                          extensions->ARB_seamless_cube_map &&
 302                          extensions->ARB_sync &&
 303                          extensions->ARB_texture_multisample &&
 304                          extensions->EXT_vertex_array_bgra);
 305    const bool ver_3_3 = (ver_3_2 &&
 306                          consts->GLSLVersion >= 330 &&
 307                          extensions->ARB_blend_func_extended &&
 308                          extensions->ARB_explicit_attrib_location &&
 309                          extensions->ARB_instanced_arrays &&
 310                          extensions->ARB_occlusion_query2 &&
 311                          extensions->ARB_shader_bit_encoding &&
 312                          extensions->ARB_texture_rgb10_a2ui &&
 313                          extensions->ARB_timer_query &&
 314                          extensions->ARB_vertex_type_2_10_10_10_rev &&
 315                          extensions->EXT_texture_swizzle);
 316    /* ARB_sampler_objects is always enabled in mesa */
 317
 318    const bool ver_4_0 = (ver_3_3 &&
 319                          consts->GLSLVersion >= 400 &&
 320                          extensions->ARB_draw_buffers_blend &&
 321                          extensions->ARB_draw_indirect &&
 322                          extensions->ARB_gpu_shader5 &&
 323                          extensions->ARB_gpu_shader_fp64 &&
 324                          extensions->ARB_sample_shading &&
 325                          extensions->ARB_tessellation_shader &&
 326                          extensions->ARB_texture_buffer_object_rgb32 &&
 327                          extensions->ARB_texture_cube_map_array &&
 328                          extensions->ARB_texture_query_lod &&
 329                          extensions->ARB_transform_feedback2 &&
 330                          extensions->ARB_transform_feedback3);
 331    const bool ver_4_1 = (ver_4_0 &&
 332                          consts->GLSLVersion >= 410 &&
 333                          extensions->ARB_ES2_compatibility &&
 334                          extensions->ARB_shader_precision &&
 335                          extensions->ARB_vertex_attrib_64bit &&
 336                          extensions->ARB_viewport_array);
 337    const bool ver_4_2 = (ver_4_1 &&
 338                          consts->GLSLVersion >= 420 &&
 339                          extensions->ARB_base_instance &&
 340                          extensions->ARB_conservative_depth &&
 341                          extensions->ARB_internalformat_query &&
 342                          extensions->ARB_shader_atomic_counters &&
 343                          extensions->ARB_shader_image_load_store &&
 344                          extensions->ARB_shading_language_420pack &&
 345                          extensions->ARB_shading_language_packing &&
 346                          extensions->ARB_texture_compression_bptc &&
 347                          extensions->ARB_transform_feedback_instanced);
 348    const bool ver_4_3 = (ver_4_2 &&
 349                          consts->GLSLVersion >= 430 &&
 350                          consts->Program[MESA_SHADER_VERTEX].MaxUniformBlocks >= 14 &&
 351                          extensions->ARB_ES3_compatibility &&
 352                          extensions->ARB_arrays_of_arrays &&
 353                          extensions->ARB_compute_shader &&
 354                          extensions->ARB_copy_image &&
 355                          extensions->ARB_explicit_uniform_location &&
 356                          extensions->ARB_fragment_layer_viewport &&
 357                          extensions->ARB_framebuffer_no_attachments &&
 358                          extensions->ARB_internalformat_query2 &&
 359                          extensions->ARB_robust_buffer_access_behavior &&
 360                          extensions->ARB_shader_image_size &&
 361                          extensions->ARB_shader_storage_buffer_object &&
 362                          extensions->ARB_stencil_texturing &&
 363                          extensions->ARB_texture_buffer_range &&
 364                          extensions->ARB_texture_query_levels &&
 365                          extensions->ARB_texture_view);
 366    const bool ver_4_4 = (ver_4_3 &&
 367                          consts->GLSLVersion >= 440 &&
 368                          consts->MaxVertexAttribStride >= 2048 &&
 369                          extensions->ARB_buffer_storage &&
 370                          extensions->ARB_clear_texture &&
 371                          extensions->ARB_enhanced_layouts &&
 372                          extensions->ARB_query_buffer_object &&
 373                          extensions->ARB_texture_mirror_clamp_to_edge &&
 374                          extensions->ARB_texture_stencil8 &&
 375                          extensions->ARB_vertex_type_10f_11f_11f_rev);
 376    const bool ver_4_5 = (ver_4_4 &&
 377                          consts->GLSLVersion >= 450 &&
 378                          extensions->ARB_ES3_1_compatibility &&
 379                          extensions->ARB_clip_control &&
 380                          extensions->ARB_conditional_render_inverted &&
 381                          extensions->ARB_cull_distance &&
 382                          extensions->ARB_derivative_control &&
 383                          extensions->ARB_shader_texture_image_samples &&
 384                          extensions->NV_texture_barrier);
 385    const bool ver_4_6 = (ver_4_5 &&
 386                          consts->GLSLVersion >= 460 &&
 387                          extensions->ARB_gl_spirv &&
 388                          extensions->ARB_spirv_extensions &&
 389                          extensions->ARB_indirect_parameters &&
 390                          extensions->ARB_pipeline_statistics_query &&
 391                          extensions->ARB_polygon_offset_clamp &&
 392                          extensions->ARB_shader_atomic_counter_ops &&
 393                          extensions->ARB_shader_draw_parameters &&
 394                          extensions->ARB_shader_group_vote &&
 395                          extensions->ARB_texture_filter_anisotropic &&
 396                          extensions->ARB_transform_feedback_overflow_query);
 397
 398    if (ver_4_6) {
 399       major = 4;
 400       minor = 6;
 401    }
 402    else if (ver_4_5) {
 403       major = 4;
 404       minor = 5;
 405    }
 406    else if (ver_4_4) {
 407       major = 4;
 408       minor = 4;
 409    }
 410    else if (ver_4_3) {
 411       major = 4;
 412       minor = 3;
 413    }
 414    else if (ver_4_2) {
 415       major = 4;
 416       minor = 2;
 417    }
 418    else if (ver_4_1) {
 419       major = 4;
 420       minor = 1;
 421    }
 422    else if (ver_4_0) {
 423       major = 4;
 424       minor = 0;
 425    }
 426    else if (ver_3_3) {
 427       major = 3;
 428       minor = 3;
 429    }
 430    else if (ver_3_2) {
 431       major = 3;
 432       minor = 2;
 433    }
 434    else if (ver_3_1) {
 435       major = 3;
 436       minor = 1;
 437    }
 438    else if (ver_3_0) {
 439       major = 3;
 440       minor = 0;
 441    }
 442    else if (ver_2_1) {
 443       major = 2;
 444       minor = 1;
 445    }
 446    else if (ver_2_0) {
 447       major = 2;
 448       minor = 0;
 449    }
 450    else if (ver_1_5) {
 451       major = 1;
 452       minor = 5;
 453    }
 454    else if (ver_1_4) {
 455       major = 1;
 456       minor = 4;
 457    }
 458    else if (ver_1_3) {
 459       major = 1;
 460       minor = 3;
 461    }
 462    else {
 463       major = 1;
 464       minor = 2;
 465    }
 466
 467    version = major * 10 + minor;
 468
 469    if (api == API_OPENGL_CORE && version < 31)
 470       return 0;
 471
 472    return version;
 473 }
 474
 475 static GLuint
 476 compute_version_es1(const struct gl_extensions *extensions)
 477 {
 478    /* OpenGL ES 1.0 is derived from OpenGL 1.3 */
 479    const bool ver_1_0 = (extensions->ARB_texture_env_combine &&
 480                          extensions->ARB_texture_env_dot3);
 481    /* OpenGL ES 1.1 is derived from OpenGL 1.5 */
 482    const bool ver_1_1 = (ver_1_0 &&
 483                          extensions->EXT_point_parameters);
 484
 485    if (ver_1_1) {
 486       return 11;
 487    } else if (ver_1_0) {
 488       return 10;
 489    } else {
 490       return 0;
 491    }
 492 }
 493
 494 static GLuint
 495 compute_version_es2(const struct gl_extensions *extensions,
 496                     const struct gl_constants *consts)
 497 {
 498    /* OpenGL ES 2.0 is derived from OpenGL 2.0 */
 499    const bool ver_2_0 = (extensions->ARB_texture_cube_map &&
 500                          extensions->EXT_blend_color &&
 501                          extensions->EXT_blend_func_separate &&
 502                          extensions->EXT_blend_minmax &&
 503                          extensions->ARB_vertex_shader &&
 504                          extensions->ARB_fragment_shader &&
 505                          extensions->ARB_texture_non_power_of_two &&
 506                          extensions->EXT_blend_equation_separate);
 507    /* FINISHME: This list isn't quite right. */
 508    const bool ver_3_0 = (extensions->ARB_half_float_vertex &&
 509                          extensions->ARB_internalformat_query &&
 510                          extensions->ARB_map_buffer_range &&
 511                          extensions->ARB_shader_texture_lod &&
 512                          extensions->OES_texture_float &&
 513                          extensions->OES_texture_half_float &&
 514                          extensions->OES_texture_half_float_linear &&
 515                          extensions->ARB_texture_rg &&
 516                          extensions->ARB_depth_buffer_float &&
 517                          extensions->ARB_framebuffer_object &&
 518                          extensions->EXT_sRGB &&
 519                          extensions->EXT_packed_float &&
 520                          extensions->EXT_texture_array &&
 521                          extensions->EXT_texture_shared_exponent &&
 522                          extensions->EXT_texture_sRGB &&
 523                          extensions->EXT_transform_feedback &&
 524                          extensions->ARB_draw_instanced &&
 525                          extensions->ARB_uniform_buffer_object &&
 526                          extensions->EXT_texture_snorm &&
 527                          (extensions->NV_primitive_restart ||
 528                           consts->PrimitiveRestartFixedIndex) &&
 529                          extensions->OES_depth_texture_cube_map &&
 530                          extensions->EXT_texture_type_2_10_10_10_REV);
 531    const bool es31_compute_shader =
 532       consts->MaxComputeWorkGroupInvocations >= 128;
 533    const bool ver_3_1 = (ver_3_0 &&
 534                          consts->MaxVertexAttribStride >= 2048 &&
 535                          extensions->ARB_arrays_of_arrays &&
 536                          es31_compute_shader &&
 537                          extensions->ARB_draw_indirect &&
 538                          extensions->ARB_explicit_uniform_location &&
 539                          extensions->ARB_framebuffer_no_attachments &&
 540                          extensions->ARB_shader_atomic_counters &&
 541                          extensions->ARB_shader_image_load_store &&
 542                          extensions->ARB_shader_image_size &&
 543                          extensions->ARB_shader_storage_buffer_object &&
 544                          extensions->ARB_shading_language_packing &&
 545                          extensions->ARB_stencil_texturing &&
 546                          extensions->ARB_texture_multisample &&
 547                          extensions->ARB_texture_gather &&
 548                          extensions->MESA_shader_integer_functions &&
 549                          extensions->EXT_shader_integer_mix);
 550    const bool ver_3_2 = (ver_3_1 &&
 551                          extensions->EXT_draw_buffers2 &&
 552                          extensions->KHR_blend_equation_advanced &&
 553                          extensions->KHR_robustness &&
 554                          extensions->KHR_texture_compression_astc_ldr &&
 555                          extensions->OES_copy_image &&
 556                          extensions->ARB_draw_buffers_blend &&
 557                          extensions->ARB_draw_elements_base_vertex &&
 558                          extensions->OES_geometry_shader &&
 559                          extensions->OES_primitive_bounding_box &&
 560                          extensions->OES_sample_variables &&
 561                          extensions->ARB_tessellation_shader &&
 562                          extensions->ARB_texture_border_clamp &&
 563                          extensions->OES_texture_buffer &&
 564                          extensions->OES_texture_cube_map_array &&
 565                          extensions->ARB_texture_stencil8);
 566
 567    if (ver_3_2) {
 568       return 32;
 569    } else if (ver_3_1) {
 570       return 31;
 571    } else if (ver_3_0) {
 572       return 30;
 573    } else if (ver_2_0) {
 574       return 20;
 575    } else {
 576       return 0;
 577    }
 578 }
 579
 580 GLuint
 581 _mesa_get_version(const struct gl_extensions *extensions,
 582                   struct gl_constants *consts, gl_api api)
 583 {
 584    switch (api) {
 585    case API_OPENGL_COMPAT:
 586       /* Disable higher GLSL versions for legacy contexts.
 587        * This disallows creation of higher compatibility contexts. */
 588       if (!consts->AllowHigherCompatVersion) {
 589          consts->GLSLVersion = consts->GLSLVersionCompat;
 590       }
 591       /* fall through */
 592    case API_OPENGL_CORE:
 593       return compute_version(extensions, consts, api);
 594    case API_OPENGLES:
 595       return compute_version_es1(extensions);
 596    case API_OPENGLES2:
 597       return compute_version_es2(extensions, consts);
 598    }
 599    return 0;
 600 }
 601
 602 /**
 603  * Set the context's Version and VersionString fields.
 604  * This should only be called once as part of context initialization
 605  * or to perform version check for GLX_ARB_create_context_profile.
 606  */
 607 void
 608 _mesa_compute_version(struct gl_context *ctx)
 609 {
 610    if (ctx->Version)
 611       goto done;
 612
 613    ctx->Version = _mesa_get_version(&ctx->Extensions, &ctx->Const, ctx->API);
 614    ctx->Extensions.Version = ctx->Version;
 615
 616    /* Make sure that the GLSL version lines up with the GL version. In some
 617     * cases it can be too high, e.g. if an extension is missing.
 618     */
 619    if (_mesa_is_desktop_gl(ctx)) {
 620       switch (ctx->Version) {
 621       case 20:
 622          /* fall-through, GLSL 1.20 is the minimum we support */
 623       case 21:
 624          ctx->Const.GLSLVersion = 120;
 625          break;
 626       case 30:
 627          ctx->Const.GLSLVersion = 130;
 628          break;
 629       case 31:
 630          ctx->Const.GLSLVersion = 140;
 631          break;
 632       case 32:
 633          ctx->Const.GLSLVersion = 150;
 634          break;
 635       default:
 636          if (ctx->Version >= 33)
 637             ctx->Const.GLSLVersion = ctx->Version * 10;
 638          break;
 639       }
 640    }
 641
 642    switch (ctx->API) {
 643    case API_OPENGL_COMPAT:
 644    case API_OPENGL_CORE:
 645       create_version_string(ctx, "");
 646       break;
 647
 648    case API_OPENGLES:
 649       if (!ctx->Version) {
 650          _mesa_problem(ctx, "Incomplete OpenGL ES 1.0 support.");
 651          return;
 652       }
 653       create_version_string(ctx, "OpenGL ES-CM ");
 654       break;
 655
 656    case API_OPENGLES2:
 657       if (!ctx->Version) {
 658          _mesa_problem(ctx, "Incomplete OpenGL ES 2.0 support.");
 659          return;
 660       }
 661       create_version_string(ctx, "OpenGL ES ");
 662       break;
 663    }
 664
 665 done:
 666    if (ctx->API == API_OPENGL_COMPAT && ctx->Version >= 31)
 667       ctx->Extensions.ARB_compatibility = GL_TRUE;
 668 }
 669
 670
 671 void
 672 _mesa_get_driver_uuid(struct gl_context *ctx, GLint *uuid)
 673 {
 674    ctx->Driver.GetDriverUuid(ctx, (char*) uuid);
 675 }
 676
 677 void
 678 _mesa_get_device_uuid(struct gl_context *ctx, GLint *uuid)
 679 {
 680    ctx->Driver.GetDeviceUuid(ctx, (char*) uuid);
 681 }
 682
 683 /**
 684  * Get the i-th GLSL version string.  If index=0, return the most recent
 685  * supported version.
 686  * \param ctx context to query
 687  * \param index  which version string to return, or -1 if none
 688  * \param versionOut returns the vesrion string
 689  * \return total number of shading language versions.
 690  */
 691 int
 692 _mesa_get_shading_language_version(const struct gl_context *ctx,
 693                                    int index,
 694                                    char **versionOut)
 695 {
 696    int n = 0;
 697
 698 #define GLSL_VERSION(S) \
 699    if (n++ == index) \
 700       *versionOut = S
 701
 702    /* GLSL core */
 703    if (ctx->Const.GLSLVersion >= 460)
 704       GLSL_VERSION("460");
 705    if (ctx->Const.GLSLVersion >= 450)
 706       GLSL_VERSION("450");
 707    if (ctx->Const.GLSLVersion >= 440)
 708       GLSL_VERSION("440");
 709    if (ctx->Const.GLSLVersion >= 430)
 710       GLSL_VERSION("430");
 711    if (ctx->Const.GLSLVersion >= 420)
 712       GLSL_VERSION("420");
 713    if (ctx->Const.GLSLVersion >= 410)
 714       GLSL_VERSION("410");
 715    if (ctx->Const.GLSLVersion >= 400)
 716       GLSL_VERSION("400");
 717    if (ctx->Const.GLSLVersion >= 330)
 718       GLSL_VERSION("330");
 719    if (ctx->Const.GLSLVersion >= 150)
 720       GLSL_VERSION("150");
 721    if (ctx->Const.GLSLVersion >= 140)
 722       GLSL_VERSION("140");
 723    if (ctx->Const.GLSLVersion >= 130)
 724       GLSL_VERSION("130");
 725    if (ctx->Const.GLSLVersion >= 120)
 726       GLSL_VERSION("120");
 727    /* The GL spec says to return the empty string for GLSL 1.10 */
 728    if (ctx->Const.GLSLVersion >= 110)
 729       GLSL_VERSION("");
 730
 731    /* GLSL es */
 732    if ((ctx->API == API_OPENGLES2 && ctx->Version >= 32) ||
 733         ctx->Extensions.ARB_ES3_2_compatibility)
 734       GLSL_VERSION("320 es");
 735    if (_mesa_is_gles31(ctx) || ctx->Extensions.ARB_ES3_1_compatibility)
 736       GLSL_VERSION("310 es");
 737    if (_mesa_is_gles3(ctx) || ctx->Extensions.ARB_ES3_compatibility)
 738       GLSL_VERSION("300 es");
 739    if (ctx->API == API_OPENGLES2 || ctx->Extensions.ARB_ES2_compatibility)
 740       GLSL_VERSION("100");
 741
 742 #undef GLSL_VERSION
 743
 744    return n;
 745 }