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