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