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
 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    }
 203 }
 204
 205 /**
 206  * Override the context's GLSL version if the environment variable
 207  * MESA_GLSL_VERSION_OVERRIDE is set. Valid values for
 208  * MESA_GLSL_VERSION_OVERRIDE are integers, such as "130".
 209  */
 210 void
 211 _mesa_override_glsl_version(struct gl_constants *consts)
 212 {
 213    const char *env_var = "MESA_GLSL_VERSION_OVERRIDE";
 214    const char *version;
 215    int n;
 216
 217    version = getenv(env_var);
 218    if (!version) {
 219       return;
 220    }
 221
 222    n = sscanf(version, "%u", &consts->GLSLVersion);
 223    if (n != 1) {
 224       fprintf(stderr, "error: invalid value for %s: %s\n", env_var, version);
 225       return;
 226    }
 227 }
 228
 229 /**
 230  * Examine enabled GL extensions to determine GL version.
 231  */
 232 static GLuint
 233 compute_version(const struct gl_extensions *extensions,
 234                 const struct gl_constants *consts, gl_api api)
 235 {
 236    GLuint major, minor, version;
 237
 238    const bool ver_1_3 = (extensions->ARB_texture_border_clamp &&
 239                          extensions->ARB_texture_cube_map &&
 240                          extensions->ARB_texture_env_combine &&
 241                          extensions->ARB_texture_env_dot3);
 242    const bool ver_1_4 = (ver_1_3 &&
 243                          extensions->ARB_depth_texture &&
 244                          extensions->ARB_shadow &&
 245                          extensions->ARB_texture_env_crossbar &&
 246                          extensions->EXT_blend_color &&
 247                          extensions->EXT_blend_func_separate &&
 248                          extensions->EXT_blend_minmax &&
 249                          extensions->EXT_point_parameters);
 250    const bool ver_1_5 = (ver_1_4 &&
 251                          extensions->ARB_occlusion_query);
 252    const bool ver_2_0 = (ver_1_5 &&
 253                          extensions->ARB_point_sprite &&
 254                          extensions->ARB_vertex_shader &&
 255                          extensions->ARB_fragment_shader &&
 256                          extensions->ARB_texture_non_power_of_two &&
 257                          extensions->EXT_blend_equation_separate &&
 258
 259                          /* Technically, 2.0 requires the functionality of the
 260                           * EXT version.  Enable 2.0 if either extension is
 261                           * available, and assume that a driver that only
 262                           * exposes the ATI extension will fallback to
 263                           * software when necessary.
 264                           */
 265                          (extensions->EXT_stencil_two_side
 266                           || extensions->ATI_separate_stencil));
 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_shader_subroutine &&
 330                          extensions->ARB_tessellation_shader &&
 331                          extensions->ARB_texture_buffer_object_rgb32 &&
 332                          extensions->ARB_texture_cube_map_array &&
 333                          extensions->ARB_texture_query_lod &&
 334                          extensions->ARB_transform_feedback2 &&
 335                          extensions->ARB_transform_feedback3);
 336    const bool ver_4_1 = (ver_4_0 &&
 337                          consts->GLSLVersion >= 410 &&
 338                          extensions->ARB_ES2_compatibility &&
 339                          extensions->ARB_shader_precision &&
 340                          extensions->ARB_vertex_attrib_64bit &&
 341                          extensions->ARB_viewport_array);
 342    const bool ver_4_2 = (ver_4_1 &&
 343                          consts->GLSLVersion >= 420 &&
 344                          extensions->ARB_base_instance &&
 345                          extensions->ARB_conservative_depth &&
 346                          extensions->ARB_internalformat_query &&
 347                          extensions->ARB_shader_atomic_counters &&
 348                          extensions->ARB_shader_image_load_store &&
 349                          extensions->ARB_shading_language_420pack &&
 350                          extensions->ARB_shading_language_packing &&
 351                          extensions->ARB_texture_compression_bptc &&
 352                          extensions->ARB_transform_feedback_instanced);
 353
 354    if (ver_4_2) {
 355       major = 4;
 356       minor = 2;
 357    }
 358    else if (ver_4_1) {
 359       major = 4;
 360       minor = 1;
 361    }
 362    else if (ver_4_0) {
 363       major = 4;
 364       minor = 0;
 365    }
 366    else if (ver_3_3) {
 367       major = 3;
 368       minor = 3;
 369    }
 370    else if (ver_3_2) {
 371       major = 3;
 372       minor = 2;
 373    }
 374    else if (ver_3_1) {
 375       major = 3;
 376       minor = 1;
 377    }
 378    else if (ver_3_0) {
 379       major = 3;
 380       minor = 0;
 381    }
 382    else if (ver_2_1) {
 383       major = 2;
 384       minor = 1;
 385    }
 386    else if (ver_2_0) {
 387       major = 2;
 388       minor = 0;
 389    }
 390    else if (ver_1_5) {
 391       major = 1;
 392       minor = 5;
 393    }
 394    else if (ver_1_4) {
 395       major = 1;
 396       minor = 4;
 397    }
 398    else if (ver_1_3) {
 399       major = 1;
 400       minor = 3;
 401    }
 402    else {
 403       major = 1;
 404       minor = 2;
 405    }
 406
 407    version = major * 10 + minor;
 408
 409    if (api == API_OPENGL_CORE && version < 31)
 410       return 0;
 411
 412    return version;
 413 }
 414
 415 static GLuint
 416 compute_version_es1(const struct gl_extensions *extensions)
 417 {
 418    /* OpenGL ES 1.0 is derived from OpenGL 1.3 */
 419    const bool ver_1_0 = (extensions->ARB_texture_env_combine &&
 420                          extensions->ARB_texture_env_dot3);
 421    /* OpenGL ES 1.1 is derived from OpenGL 1.5 */
 422    const bool ver_1_1 = (ver_1_0 &&
 423                          extensions->EXT_point_parameters);
 424
 425    if (ver_1_1) {
 426       return 11;
 427    } else if (ver_1_0) {
 428       return 10;
 429    } else {
 430       return 0;
 431    }
 432 }
 433
 434 static GLuint
 435 compute_version_es2(const struct gl_extensions *extensions)
 436 {
 437    /* OpenGL ES 2.0 is derived from OpenGL 2.0 */
 438    const bool ver_2_0 = (extensions->ARB_texture_cube_map &&
 439                          extensions->EXT_blend_color &&
 440                          extensions->EXT_blend_func_separate &&
 441                          extensions->EXT_blend_minmax &&
 442                          extensions->ARB_vertex_shader &&
 443                          extensions->ARB_fragment_shader &&
 444                          extensions->ARB_texture_non_power_of_two &&
 445                          extensions->EXT_blend_equation_separate);
 446    /* FINISHME: This list isn't quite right. */
 447    const bool ver_3_0 = (extensions->ARB_half_float_vertex &&
 448                          extensions->ARB_internalformat_query &&
 449                          extensions->ARB_map_buffer_range &&
 450                          extensions->ARB_shader_texture_lod &&
 451                          extensions->ARB_texture_float &&
 452                          extensions->ARB_texture_rg &&
 453                          extensions->ARB_depth_buffer_float &&
 454                          extensions->EXT_draw_buffers2 &&
 455                          /* extensions->ARB_framebuffer_object && */
 456                          extensions->EXT_framebuffer_sRGB &&
 457                          extensions->EXT_packed_float &&
 458                          extensions->EXT_texture_array &&
 459                          extensions->EXT_texture_shared_exponent &&
 460                          extensions->EXT_transform_feedback &&
 461                          extensions->ARB_draw_instanced &&
 462                          extensions->ARB_uniform_buffer_object &&
 463                          extensions->EXT_texture_snorm &&
 464                          extensions->NV_primitive_restart &&
 465                          extensions->OES_depth_texture_cube_map);
 466    const bool ver_3_1 = (ver_3_0 &&
 467                          extensions->ARB_arrays_of_arrays &&
 468                          extensions->ARB_compute_shader &&
 469                          extensions->ARB_draw_indirect &&
 470                          extensions->ARB_explicit_uniform_location &&
 471                          extensions->ARB_framebuffer_no_attachments &&
 472                          extensions->ARB_shader_atomic_counters &&
 473                          extensions->ARB_shader_image_load_store &&
 474                          extensions->ARB_shader_image_size &&
 475                          extensions->ARB_shader_storage_buffer_object &&
 476                          extensions->ARB_shading_language_packing &&
 477                          extensions->ARB_stencil_texturing &&
 478                          extensions->ARB_texture_multisample &&
 479                          extensions->ARB_gpu_shader5 &&
 480                          extensions->EXT_shader_integer_mix);
 481
 482    if (ver_3_1) {
 483       return 31;
 484    } else if (ver_3_0) {
 485       return 30;
 486    } else if (ver_2_0) {
 487       return 20;
 488    } else {
 489       return 0;
 490    }
 491 }
 492
 493 GLuint
 494 _mesa_get_version(const struct gl_extensions *extensions,
 495                   struct gl_constants *consts, gl_api api)
 496 {
 497    switch (api) {
 498    case API_OPENGL_COMPAT:
 499       /* Disable GLSL 1.40 and later for legacy contexts.
 500        * This disallows creation of the GL 3.1 compatibility context. */
 501       if (consts->GLSLVersion > 130) {
 502          consts->GLSLVersion = 130;
 503       }
 504       /* fall through */
 505    case API_OPENGL_CORE:
 506       return compute_version(extensions, consts, api);
 507    case API_OPENGLES:
 508       return compute_version_es1(extensions);
 509    case API_OPENGLES2:
 510       return compute_version_es2(extensions);
 511    }
 512    return 0;
 513 }
 514
 515 /**
 516  * Set the context's Version and VersionString fields.
 517  * This should only be called once as part of context initialization
 518  * or to perform version check for GLX_ARB_create_context_profile.
 519  */
 520 void
 521 _mesa_compute_version(struct gl_context *ctx)
 522 {
 523    if (ctx->Version)
 524       return;
 525
 526    ctx->Version = _mesa_get_version(&ctx->Extensions, &ctx->Const, ctx->API);
 527    ctx->Extensions.Version = ctx->Version;
 528
 529    /* Make sure that the GLSL version lines up with the GL version. In some
 530     * cases it can be too high, e.g. if an extension is missing.
 531     */
 532    if (ctx->API == API_OPENGL_CORE) {
 533       switch (ctx->Version) {
 534       case 31:
 535          ctx->Const.GLSLVersion = 140;
 536          break;
 537       case 32:
 538          ctx->Const.GLSLVersion = 150;
 539          break;
 540       default:
 541          ctx->Const.GLSLVersion = ctx->Version * 10;
 542          break;
 543       }
 544    }
 545
 546    switch (ctx->API) {
 547    case API_OPENGL_COMPAT:
 548    case API_OPENGL_CORE:
 549       create_version_string(ctx, "");
 550       break;
 551
 552    case API_OPENGLES:
 553       if (!ctx->Version) {
 554          _mesa_problem(ctx, "Incomplete OpenGL ES 1.0 support.");
 555          return;
 556       }
 557       create_version_string(ctx, "OpenGL ES-CM ");
 558       break;
 559
 560    case API_OPENGLES2:
 561       if (!ctx->Version) {
 562          _mesa_problem(ctx, "Incomplete OpenGL ES 2.0 support.");
 563          return;
 564       }
 565       create_version_string(ctx, "OpenGL ES ");
 566       break;
 567    }
 568 }