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 138 * environment variable MESA_GL_VERSION_OVERRIDE is 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 a Core profile with GL version 3.1 146 * 3.1FC: select a Core+Forward Compatible profile with GL version 3.1 147 */ 148 bool 149 _mesa_override_gl_version_contextless(struct gl_constants *consts, 150 gl_api *apiOut, GLuint *versionOut) 151 { 152 int version; 153 bool fwd_context, compat_context; 154 155 get_gl_override(*apiOut, &version, &fwd_context, &compat_context); 156 157 if (version > 0) { 158 *versionOut = version; 159 160 /* If the API is a desktop API, adjust the context flags. We may also 161 * need to modify the API depending on the version. For example, Mesa 162 * does not support a GL 3.3 compatibility profile. 163 */ 164 if (*apiOut == API_OPENGL_CORE || *apiOut == API_OPENGL_COMPAT) { 165 if (version >= 30 && fwd_context) { 166 *apiOut = API_OPENGL_CORE; 167 consts->ContextFlags |= GL_CONTEXT_FLAG_FORWARD_COMPATIBLE_BIT; 168 } else if (version >= 31 && !compat_context) { 169 *apiOut = API_OPENGL_CORE; 170 } else { 171 *apiOut = API_OPENGL_COMPAT; 172 } 173 } 174 175 return true; 176 } 177 return false; 178 } 179 180 void 181 _mesa_override_gl_version(struct gl_context *ctx) 182 { 183 if (_mesa_override_gl_version_contextless(&ctx->Const, &ctx->API, 184 &ctx->Version)) { 185 /* We need to include API in version string for OpenGL ES, otherwise 186 * application can not detect GLES via glGetString(GL_VERSION) query. 187 * 188 * From OpenGL ES 3.2 spec, Page 436: 189 * 190 * "The VERSION string is laid out as follows: 191 * 192 * OpenGL ES N.M vendor-specific information" 193 * 194 * From OpenGL 4.5 spec, Page 538: 195 * 196 * "The VERSION and SHADING_LANGUAGE_VERSION strings are laid out as 197 * follows: 198 * 199 * <version number><space><vendor-specific information>" 200 */ 201 create_version_string(ctx, _mesa_is_gles(ctx) ? "OpenGL ES " : ""); 202 ctx->Extensions.Version = ctx->Version; 203 } 204 } 205 206 /** 207 * Override the context's GLSL version if the environment variable 208 * MESA_GLSL_VERSION_OVERRIDE is set. Valid values for 209 * MESA_GLSL_VERSION_OVERRIDE are integers, such as "130". 210 */ 211 void 212 _mesa_override_glsl_version(struct gl_constants *consts) 213 { 214 const char *env_var = "MESA_GLSL_VERSION_OVERRIDE"; 215 const char *version; 216 int n; 217 218 version = getenv(env_var); 219 if (!version) { 220 return; 221 } 222 223 n = sscanf(version, "%u", &consts->GLSLVersion); 224 if (n != 1) { 225 fprintf(stderr, "error: invalid value for %s: %s\n", env_var, version); 226 return; 227 } 228 } 229 230 /** 231 * Examine enabled GL extensions to determine GL version. 232 */ 233 static GLuint 234 compute_version(const struct gl_extensions *extensions, 235 const struct gl_constants *consts, gl_api api) 236 { 237 GLuint major, minor, version; 238 239 const bool ver_1_3 = (extensions->ARB_texture_border_clamp && 240 extensions->ARB_texture_cube_map && 241 extensions->ARB_texture_env_combine && 242 extensions->ARB_texture_env_dot3); 243 const bool ver_1_4 = (ver_1_3 && 244 extensions->ARB_depth_texture && 245 extensions->ARB_shadow && 246 extensions->ARB_texture_env_crossbar && 247 extensions->EXT_blend_color && 248 extensions->EXT_blend_func_separate && 249 extensions->EXT_blend_minmax && 250 extensions->EXT_point_parameters); 251 const bool ver_1_5 = (ver_1_4 && 252 extensions->ARB_occlusion_query); 253 const bool ver_2_0 = (ver_1_5 && 254 extensions->ARB_point_sprite && 255 extensions->ARB_vertex_shader && 256 extensions->ARB_fragment_shader && 257 extensions->ARB_texture_non_power_of_two && 258 extensions->EXT_blend_equation_separate && 259 260 /* Technically, 2.0 requires the functionality of the 261 * EXT version. Enable 2.0 if either extension is 262 * available, and assume that a driver that only 263 * exposes the ATI extension will fallback to 264 * software when necessary. 265 */ 266 (extensions->EXT_stencil_two_side 267 || extensions->ATI_separate_stencil)); 268 const bool ver_2_1 = (ver_2_0 && 269 extensions->EXT_pixel_buffer_object && 270 extensions->EXT_texture_sRGB); 271 const bool ver_3_0 = (ver_2_1 && 272 consts->GLSLVersion >= 130 && 273 (consts->MaxSamples >= 4 || consts->FakeSWMSAA) && 274 (api == API_OPENGL_CORE || 275 extensions->ARB_color_buffer_float) && 276 extensions->ARB_depth_buffer_float && 277 extensions->ARB_half_float_vertex && 278 extensions->ARB_map_buffer_range && 279 extensions->ARB_shader_texture_lod && 280 extensions->ARB_texture_float && 281 extensions->ARB_texture_rg && 282 extensions->ARB_texture_compression_rgtc && 283 extensions->EXT_draw_buffers2 && 284 extensions->ARB_framebuffer_object && 285 extensions->EXT_framebuffer_sRGB && 286 extensions->EXT_packed_float && 287 extensions->EXT_texture_array && 288 extensions->EXT_texture_shared_exponent && 289 extensions->EXT_transform_feedback && 290 extensions->NV_conditional_render); 291 const bool ver_3_1 = (ver_3_0 && 292 consts->GLSLVersion >= 140 && 293 extensions->ARB_draw_instanced && 294 extensions->ARB_texture_buffer_object && 295 extensions->ARB_uniform_buffer_object && 296 extensions->EXT_texture_snorm && 297 extensions->NV_primitive_restart && 298 extensions->NV_texture_rectangle && 299 consts->Program[MESA_SHADER_VERTEX].MaxTextureImageUnits >= 16); 300 const bool ver_3_2 = (ver_3_1 && 301 consts->GLSLVersion >= 150 && 302 extensions->ARB_depth_clamp && 303 extensions->ARB_draw_elements_base_vertex && 304 extensions->ARB_fragment_coord_conventions && 305 extensions->EXT_provoking_vertex && 306 extensions->ARB_seamless_cube_map && 307 extensions->ARB_sync && 308 extensions->ARB_texture_multisample && 309 extensions->EXT_vertex_array_bgra); 310 const bool ver_3_3 = (ver_3_2 && 311 consts->GLSLVersion >= 330 && 312 extensions->ARB_blend_func_extended && 313 extensions->ARB_explicit_attrib_location && 314 extensions->ARB_instanced_arrays && 315 extensions->ARB_occlusion_query2 && 316 extensions->ARB_shader_bit_encoding && 317 extensions->ARB_texture_rgb10_a2ui && 318 extensions->ARB_timer_query && 319 extensions->ARB_vertex_type_2_10_10_10_rev && 320 extensions->EXT_texture_swizzle); 321 /* ARB_sampler_objects is always enabled in mesa */ 322 323 const bool ver_4_0 = (ver_3_3 && 324 consts->GLSLVersion >= 400 && 325 extensions->ARB_draw_buffers_blend && 326 extensions->ARB_draw_indirect && 327 extensions->ARB_gpu_shader5 && 328 extensions->ARB_gpu_shader_fp64 && 329 extensions->ARB_sample_shading && 330 extensions->ARB_shader_subroutine && 331 extensions->ARB_tessellation_shader && 332 extensions->ARB_texture_buffer_object_rgb32 && 333 extensions->ARB_texture_cube_map_array && 334 extensions->ARB_texture_query_lod && 335 extensions->ARB_transform_feedback2 && 336 extensions->ARB_transform_feedback3); 337 const bool ver_4_1 = (ver_4_0 && 338 consts->GLSLVersion >= 410 && 339 extensions->ARB_ES2_compatibility && 340 extensions->ARB_shader_precision && 341 extensions->ARB_vertex_attrib_64bit && 342 extensions->ARB_viewport_array); 343 const bool ver_4_2 = (ver_4_1 && 344 consts->GLSLVersion >= 420 && 345 extensions->ARB_base_instance && 346 extensions->ARB_conservative_depth && 347 extensions->ARB_internalformat_query && 348 extensions->ARB_shader_atomic_counters && 349 extensions->ARB_shader_image_load_store && 350 extensions->ARB_shading_language_420pack && 351 extensions->ARB_shading_language_packing && 352 extensions->ARB_texture_compression_bptc && 353 extensions->ARB_transform_feedback_instanced); 354 const bool ver_4_3 = (ver_4_2 && 355 consts->GLSLVersion >= 430 && 356 extensions->ARB_ES3_compatibility && 357 extensions->ARB_arrays_of_arrays && 358 extensions->ARB_compute_shader && 359 extensions->ARB_copy_image && 360 extensions->ARB_explicit_uniform_location && 361 extensions->ARB_fragment_layer_viewport && 362 extensions->ARB_framebuffer_no_attachments && 363 extensions->ARB_internalformat_query2 && 364 extensions->ARB_robust_buffer_access_behavior && 365 extensions->ARB_shader_image_size && 366 extensions->ARB_shader_storage_buffer_object && 367 extensions->ARB_stencil_texturing && 368 extensions->ARB_texture_buffer_range && 369 extensions->ARB_texture_query_levels && 370 extensions->ARB_texture_view); 371 const bool ver_4_4 = (ver_4_3 && 372 consts->GLSLVersion >= 440 && 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); 389 390 if (ver_4_5) { 391 major = 4; 392 minor = 5; 393 } 394 else if (ver_4_4) { 395 major = 4; 396 minor = 4; 397 } 398 else if (ver_4_3) { 399 major = 4; 400 minor = 3; 401 } 402 else if (ver_4_2) { 403 major = 4; 404 minor = 2; 405 } 406 else if (ver_4_1) { 407 major = 4; 408 minor = 1; 409 } 410 else if (ver_4_0) { 411 major = 4; 412 minor = 0; 413 } 414 else if (ver_3_3) { 415 major = 3; 416 minor = 3; 417 } 418 else if (ver_3_2) { 419 major = 3; 420 minor = 2; 421 } 422 else if (ver_3_1) { 423 major = 3; 424 minor = 1; 425 } 426 else if (ver_3_0) { 427 major = 3; 428 minor = 0; 429 } 430 else if (ver_2_1) { 431 major = 2; 432 minor = 1; 433 } 434 else if (ver_2_0) { 435 major = 2; 436 minor = 0; 437 } 438 else if (ver_1_5) { 439 major = 1; 440 minor = 5; 441 } 442 else if (ver_1_4) { 443 major = 1; 444 minor = 4; 445 } 446 else if (ver_1_3) { 447 major = 1; 448 minor = 3; 449 } 450 else { 451 major = 1; 452 minor = 2; 453 } 454 455 version = major * 10 + minor; 456 457 if (api == API_OPENGL_CORE && version < 31) 458 return 0; 459 460 return version; 461 } 462 463 static GLuint 464 compute_version_es1(const struct gl_extensions *extensions) 465 { 466 /* OpenGL ES 1.0 is derived from OpenGL 1.3 */ 467 const bool ver_1_0 = (extensions->ARB_texture_env_combine && 468 extensions->ARB_texture_env_dot3); 469 /* OpenGL ES 1.1 is derived from OpenGL 1.5 */ 470 const bool ver_1_1 = (ver_1_0 && 471 extensions->EXT_point_parameters); 472 473 if (ver_1_1) { 474 return 11; 475 } else if (ver_1_0) { 476 return 10; 477 } else { 478 return 0; 479 } 480 } 481 482 static GLuint 483 compute_version_es2(const struct gl_extensions *extensions, 484 const struct gl_constants *consts) 485 { 486 /* OpenGL ES 2.0 is derived from OpenGL 2.0 */ 487 const bool ver_2_0 = (extensions->ARB_texture_cube_map && 488 extensions->EXT_blend_color && 489 extensions->EXT_blend_func_separate && 490 extensions->EXT_blend_minmax && 491 extensions->ARB_vertex_shader && 492 extensions->ARB_fragment_shader && 493 extensions->ARB_texture_non_power_of_two && 494 extensions->EXT_blend_equation_separate); 495 /* FINISHME: This list isn't quite right. */ 496 const bool ver_3_0 = (extensions->ARB_half_float_vertex && 497 extensions->ARB_internalformat_query && 498 extensions->ARB_map_buffer_range && 499 extensions->ARB_shader_texture_lod && 500 extensions->ARB_texture_float && 501 extensions->ARB_texture_rg && 502 extensions->ARB_depth_buffer_float && 503 extensions->EXT_draw_buffers2 && 504 /* extensions->ARB_framebuffer_object && */ 505 extensions->EXT_framebuffer_sRGB && 506 extensions->EXT_packed_float && 507 extensions->EXT_texture_array && 508 extensions->EXT_texture_shared_exponent && 509 extensions->EXT_transform_feedback && 510 extensions->ARB_draw_instanced && 511 extensions->ARB_uniform_buffer_object && 512 extensions->EXT_texture_snorm && 513 extensions->NV_primitive_restart && 514 extensions->OES_depth_texture_cube_map); 515 const bool es31_compute_shader = 516 consts->MaxComputeWorkGroupInvocations >= 128; 517 const bool ver_3_1 = (ver_3_0 && 518 extensions->ARB_arrays_of_arrays && 519 es31_compute_shader && 520 extensions->ARB_draw_indirect && 521 extensions->ARB_explicit_uniform_location && 522 extensions->ARB_framebuffer_no_attachments && 523 extensions->ARB_shader_atomic_counters && 524 extensions->ARB_shader_image_load_store && 525 extensions->ARB_shader_image_size && 526 extensions->ARB_shader_storage_buffer_object && 527 extensions->ARB_shading_language_packing && 528 extensions->ARB_stencil_texturing && 529 extensions->ARB_texture_multisample && 530 extensions->ARB_gpu_shader5 && 531 extensions->EXT_shader_integer_mix); 532 const bool ver_3_2 = (ver_3_1 && 533 extensions->KHR_blend_equation_advanced && 534 extensions->KHR_robustness && 535 extensions->KHR_texture_compression_astc_ldr && 536 extensions->OES_copy_image && 537 extensions->ARB_draw_buffers_blend && 538 extensions->ARB_draw_elements_base_vertex && 539 extensions->OES_geometry_shader && 540 extensions->OES_primitive_bounding_box && 541 extensions->OES_sample_variables && 542 extensions->ARB_tessellation_shader && 543 extensions->ARB_texture_border_clamp && 544 extensions->OES_texture_buffer && 545 extensions->OES_texture_cube_map_array && 546 extensions->ARB_texture_stencil8); 547 548 if (ver_3_2) { 549 return 32; 550 } else if (ver_3_1) { 551 return 31; 552 } else if (ver_3_0) { 553 return 30; 554 } else if (ver_2_0) { 555 return 20; 556 } else { 557 return 0; 558 } 559 } 560 561 GLuint 562 _mesa_get_version(const struct gl_extensions *extensions, 563 struct gl_constants *consts, gl_api api) 564 { 565 switch (api) { 566 case API_OPENGL_COMPAT: 567 /* Disable GLSL 1.40 and later for legacy contexts. 568 * This disallows creation of the GL 3.1 compatibility context. */ 569 if (consts->GLSLVersion > 130) { 570 consts->GLSLVersion = 130; 571 } 572 /* fall through */ 573 case API_OPENGL_CORE: 574 return compute_version(extensions, consts, api); 575 case API_OPENGLES: 576 return compute_version_es1(extensions); 577 case API_OPENGLES2: 578 return compute_version_es2(extensions, consts); 579 } 580 return 0; 581 } 582 583 /** 584 * Set the context's Version and VersionString fields. 585 * This should only be called once as part of context initialization 586 * or to perform version check for GLX_ARB_create_context_profile. 587 */ 588 void 589 _mesa_compute_version(struct gl_context *ctx) 590 { 591 if (ctx->Version) 592 return; 593 594 ctx->Version = _mesa_get_version(&ctx->Extensions, &ctx->Const, ctx->API); 595 ctx->Extensions.Version = ctx->Version; 596 597 /* Make sure that the GLSL version lines up with the GL version. In some 598 * cases it can be too high, e.g. if an extension is missing. 599 */ 600 if (ctx->API == API_OPENGL_CORE) { 601 switch (ctx->Version) { 602 case 31: 603 ctx->Const.GLSLVersion = 140; 604 break; 605 case 32: 606 ctx->Const.GLSLVersion = 150; 607 break; 608 default: 609 ctx->Const.GLSLVersion = ctx->Version * 10; 610 break; 611 } 612 } 613 614 switch (ctx->API) { 615 case API_OPENGL_COMPAT: 616 case API_OPENGL_CORE: 617 create_version_string(ctx, ""); 618 break; 619 620 case API_OPENGLES: 621 if (!ctx->Version) { 622 _mesa_problem(ctx, "Incomplete OpenGL ES 1.0 support."); 623 return; 624 } 625 create_version_string(ctx, "OpenGL ES-CM "); 626 break; 627 628 case API_OPENGLES2: 629 if (!ctx->Version) { 630 _mesa_problem(ctx, "Incomplete OpenGL ES 2.0 support."); 631 return; 632 } 633 create_version_string(ctx, "OpenGL ES "); 634 break; 635 } 636 } 637
