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 "imports.h"
  27 #include "mtypes.h"
  28 #include "version.h"
  29 #include "git_sha1.h"
  30
  31 /**
  32  * Scans 'string' to see if it ends with 'ending'.
  33  */
  34 static GLboolean
  35 check_for_ending(const char *string, const char *ending)
  36 {
  37    int len1, len2;
  38
  39    len1 = strlen(string);
  40    len2 = strlen(ending);
  41
  42    if (len2 > len1) {
  43       return GL_FALSE;
  44    }
  45
  46    if (strcmp(string + (len1 - len2), ending) == 0) {
  47       return GL_TRUE;
  48    } else {
  49       return GL_FALSE;
  50    }
  51 }
  52
  53 /**
  54  * Returns the gl override data
  55  *
  56  * version > 0 indicates there is an override requested
  57  * fwd_context is only valid if version > 0
  58  */
  59 static void
  60 get_gl_override(int *version, GLboolean *fwd_context)
  61 {
  62    const char *env_var = "MESA_GL_VERSION_OVERRIDE";
  63    const char *version_str;
  64    int major, minor, n;
  65    static int override_version = -1;
  66    static GLboolean fc_suffix = GL_FALSE;
  67
  68    if (override_version < 0) {
  69       override_version = 0;
  70
  71       version_str = getenv(env_var);
  72       if (version_str) {
  73          fc_suffix = check_for_ending(version_str, "FC");
  74
  75          n = sscanf(version_str, "%u.%u", &major, &minor);
  76          if (n != 2) {
  77             fprintf(stderr, "error: invalid value for %s: %s\n", env_var, version_str);
  78             override_version = 0;
  79          } else {
  80             override_version = major * 10 + minor;
  81             if (override_version < 30 && fc_suffix) {
  82                fprintf(stderr, "error: invalid value for %s: %s\n", env_var, version_str);
  83             }
  84          }
  85       }
  86    }
  87
  88    *version = override_version;
  89    *fwd_context = fc_suffix;
  90 }
  91
  92 /**
  93  * Builds the MESA version string.
  94  */
  95 static void
  96 create_version_string(struct gl_context *ctx, const char *prefix)
  97 {
  98    static const int max = 100;
  99
 100    ctx->VersionString = malloc(max);
 101    if (ctx->VersionString) {
 102       _mesa_snprintf(ctx->VersionString, max,
 103                      "%s%u.%u%s Mesa " PACKAGE_VERSION
 104 #ifdef MESA_GIT_SHA1
 105                      " (" MESA_GIT_SHA1 ")"
 106 #endif
 107                      ,
 108                      prefix,
 109                      ctx->Version / 10, ctx->Version % 10,
 110                      (ctx->API == API_OPENGL_CORE) ? " (Core Profile)" : ""
 111                      );
 112    }
 113 }
 114
 115 /**
 116  * Override the context's version and/or API type if the
 117  * environment variable MESA_GL_VERSION_OVERRIDE is set.
 118  *
 119  * Example uses of MESA_GL_VERSION_OVERRIDE:
 120  *
 121  * 2.1: select a compatibility (non-Core) profile with GL version 2.1
 122  * 3.0: select a compatibility (non-Core) profile with GL version 3.0
 123  * 3.0FC: select a Core+Forward Compatible profile with GL version 3.0
 124  * 3.1: select a Core profile with GL version 3.1
 125  * 3.1FC: select a Core+Forward Compatible profile with GL version 3.1
 126  */
 127 bool
 128 _mesa_override_gl_version_contextless(struct gl_constants *consts,
 129                                       gl_api *apiOut, GLuint *versionOut)
 130 {
 131    int version;
 132    GLboolean fwd_context;
 133
 134    get_gl_override(&version, &fwd_context);
 135
 136    if (version > 0) {
 137       *versionOut = version;
 138       if (version >= 30 && fwd_context) {
 139          *apiOut = API_OPENGL_CORE;
 140          consts->ContextFlags |= GL_CONTEXT_FLAG_FORWARD_COMPATIBLE_BIT;
 141       } else if (version >= 31) {
 142          *apiOut = API_OPENGL_CORE;
 143       } else {
 144          *apiOut = API_OPENGL_COMPAT;
 145       }
 146       return GL_TRUE;
 147    }
 148    return GL_FALSE;
 149 }
 150
 151 void
 152 _mesa_override_gl_version(struct gl_context *ctx)
 153 {
 154    if (_mesa_override_gl_version_contextless(&ctx->Const, &ctx->API,
 155                                              &ctx->Version)) {
 156       create_version_string(ctx, "");
 157    }
 158 }
 159
 160 /**
 161  * Returns the gl override value
 162  *
 163  * version > 0 indicates there is an override requested
 164  */
 165 int
 166 _mesa_get_gl_version_override(void)
 167 {
 168    int version;
 169    GLboolean fwd_context;
 170
 171    get_gl_override(&version, &fwd_context);
 172
 173    return version;
 174 }
 175
 176 /**
 177  * Override the context's GLSL version if the environment variable
 178  * MESA_GLSL_VERSION_OVERRIDE is set. Valid values for
 179  * MESA_GLSL_VERSION_OVERRIDE are integers, such as "130".
 180  */
 181 void
 182 _mesa_override_glsl_version(struct gl_constants *consts)
 183 {
 184    const char *env_var = "MESA_GLSL_VERSION_OVERRIDE";
 185    const char *version;
 186    int n;
 187
 188    version = getenv(env_var);
 189    if (!version) {
 190       return;
 191    }
 192
 193    n = sscanf(version, "%u", &consts->GLSLVersion);
 194    if (n != 1) {
 195       fprintf(stderr, "error: invalid value for %s: %s\n", env_var, version);
 196       return;
 197    }
 198 }
 199
 200 /**
 201  * Examine enabled GL extensions to determine GL version.
 202  */
 203 static GLuint
 204 compute_version(const struct gl_extensions *extensions,
 205                 const struct gl_constants *consts, gl_api api)
 206 {
 207    GLuint major, minor;
 208
 209    const GLboolean ver_1_3 = (extensions->ARB_texture_border_clamp &&
 210                               extensions->ARB_texture_cube_map &&
 211                               extensions->ARB_texture_env_combine &&
 212                               extensions->ARB_texture_env_dot3);
 213    const GLboolean ver_1_4 = (ver_1_3 &&
 214                               extensions->ARB_depth_texture &&
 215                               extensions->ARB_shadow &&
 216                               extensions->ARB_texture_env_crossbar &&
 217                               extensions->EXT_blend_color &&
 218                               extensions->EXT_blend_func_separate &&
 219                               extensions->EXT_blend_minmax &&
 220                               extensions->EXT_point_parameters);
 221    const GLboolean ver_1_5 = (ver_1_4 &&
 222                               extensions->ARB_occlusion_query);
 223    const GLboolean ver_2_0 = (ver_1_5 &&
 224                               extensions->ARB_point_sprite &&
 225                               extensions->ARB_vertex_shader &&
 226                               extensions->ARB_fragment_shader &&
 227                               extensions->ARB_texture_non_power_of_two &&
 228                               extensions->EXT_blend_equation_separate &&
 229
 230                               /* Technically, 2.0 requires the functionality
 231                                * of the EXT version.  Enable 2.0 if either
 232                                * extension is available, and assume that a
 233                                * driver that only exposes the ATI extension
 234                                * will fallback to software when necessary.
 235                                */
 236                               (extensions->EXT_stencil_two_side
 237                                || extensions->ATI_separate_stencil));
 238    const GLboolean ver_2_1 = (ver_2_0 &&
 239                               extensions->EXT_pixel_buffer_object &&
 240                               extensions->EXT_texture_sRGB);
 241    const GLboolean ver_3_0 = (ver_2_1 &&
 242                               consts->GLSLVersion >= 130 &&
 243                               (consts->MaxSamples >= 4 || consts->FakeSWMSAA) &&
 244                               (api == API_OPENGL_CORE ||
 245                                extensions->ARB_color_buffer_float) &&
 246                               extensions->ARB_depth_buffer_float &&
 247                               extensions->ARB_half_float_vertex &&
 248                               extensions->ARB_map_buffer_range &&
 249                               extensions->ARB_shader_texture_lod &&
 250                               extensions->ARB_texture_float &&
 251                               extensions->ARB_texture_rg &&
 252                               extensions->ARB_texture_compression_rgtc &&
 253                               extensions->EXT_draw_buffers2 &&
 254                               extensions->ARB_framebuffer_object &&
 255                               extensions->EXT_framebuffer_sRGB &&
 256                               extensions->EXT_packed_float &&
 257                               extensions->EXT_texture_array &&
 258                               extensions->EXT_texture_shared_exponent &&
 259                               extensions->EXT_transform_feedback &&
 260                               extensions->NV_conditional_render);
 261    const GLboolean ver_3_1 = (ver_3_0 &&
 262                               consts->GLSLVersion >= 140 &&
 263                               extensions->ARB_draw_instanced &&
 264                               extensions->ARB_texture_buffer_object &&
 265                               extensions->ARB_uniform_buffer_object &&
 266                               extensions->EXT_texture_snorm &&
 267                               extensions->NV_primitive_restart &&
 268                               extensions->NV_texture_rectangle &&
 269                               consts->Program[MESA_SHADER_VERTEX].MaxTextureImageUnits >= 16);
 270    const GLboolean ver_3_2 = (ver_3_1 &&
 271                               consts->GLSLVersion >= 150 &&
 272                               extensions->ARB_depth_clamp &&
 273                               extensions->ARB_draw_elements_base_vertex &&
 274                               extensions->ARB_fragment_coord_conventions &&
 275                               extensions->EXT_provoking_vertex &&
 276                               extensions->ARB_seamless_cube_map &&
 277                               extensions->ARB_sync &&
 278                               extensions->ARB_texture_multisample &&
 279                               extensions->EXT_vertex_array_bgra);
 280    const GLboolean ver_3_3 = (ver_3_2 &&
 281                               consts->GLSLVersion >= 330 &&
 282                               extensions->ARB_blend_func_extended &&
 283                               extensions->ARB_explicit_attrib_location &&
 284                               extensions->ARB_instanced_arrays &&
 285                               extensions->ARB_occlusion_query2 &&
 286                               extensions->ARB_shader_bit_encoding &&
 287                               extensions->ARB_texture_rgb10_a2ui &&
 288                               extensions->ARB_timer_query &&
 289                               extensions->ARB_vertex_type_2_10_10_10_rev &&
 290                               extensions->EXT_texture_swizzle);
 291                               /* ARB_sampler_objects is always enabled in mesa */
 292
 293    if (ver_3_3) {
 294       major = 3;
 295       minor = 3;
 296    }
 297    else if (ver_3_2) {
 298       major = 3;
 299       minor = 2;
 300    }
 301    else if (ver_3_1) {
 302       major = 3;
 303       minor = 1;
 304    }
 305    else if (ver_3_0) {
 306       major = 3;
 307       minor = 0;
 308    }
 309    else if (ver_2_1) {
 310       major = 2;
 311       minor = 1;
 312    }
 313    else if (ver_2_0) {
 314       major = 2;
 315       minor = 0;
 316    }
 317    else if (ver_1_5) {
 318       major = 1;
 319       minor = 5;
 320    }
 321    else if (ver_1_4) {
 322       major = 1;
 323       minor = 4;
 324    }
 325    else if (ver_1_3) {
 326       major = 1;
 327       minor = 3;
 328    }
 329    else {
 330       major = 1;
 331       minor = 2;
 332    }
 333
 334    return major * 10 + minor;
 335 }
 336
 337 static GLuint
 338 compute_version_es1(const struct gl_extensions *extensions)
 339 {
 340    /* OpenGL ES 1.0 is derived from OpenGL 1.3 */
 341    const GLboolean ver_1_0 = (extensions->ARB_texture_env_combine &&
 342                               extensions->ARB_texture_env_dot3);
 343    /* OpenGL ES 1.1 is derived from OpenGL 1.5 */
 344    const GLboolean ver_1_1 = (ver_1_0 &&
 345                               extensions->EXT_point_parameters);
 346
 347    if (ver_1_1) {
 348       return 11;
 349    } else if (ver_1_0) {
 350       return 10;
 351    } else {
 352       return 0;
 353    }
 354 }
 355
 356 static GLuint
 357 compute_version_es2(const struct gl_extensions *extensions)
 358 {
 359    /* OpenGL ES 2.0 is derived from OpenGL 2.0 */
 360    const GLboolean ver_2_0 = (extensions->ARB_texture_cube_map &&
 361                               extensions->EXT_blend_color &&
 362                               extensions->EXT_blend_func_separate &&
 363                               extensions->EXT_blend_minmax &&
 364                               extensions->ARB_vertex_shader &&
 365                               extensions->ARB_fragment_shader &&
 366                               extensions->ARB_texture_non_power_of_two &&
 367                               extensions->EXT_blend_equation_separate);
 368    /* FINISHME: This list isn't quite right. */
 369    const GLboolean ver_3_0 = (extensions->ARB_half_float_vertex &&
 370                               extensions->ARB_internalformat_query &&
 371                               extensions->ARB_map_buffer_range &&
 372                               extensions->ARB_shader_texture_lod &&
 373                               extensions->ARB_texture_float &&
 374                               extensions->ARB_texture_rg &&
 375                               extensions->ARB_texture_compression_rgtc &&
 376                               extensions->EXT_draw_buffers2 &&
 377                               /* extensions->ARB_framebuffer_object && */
 378                               extensions->EXT_framebuffer_sRGB &&
 379                               extensions->EXT_packed_float &&
 380                               extensions->EXT_texture_array &&
 381                               extensions->EXT_texture_shared_exponent &&
 382                               extensions->EXT_transform_feedback &&
 383                               extensions->NV_conditional_render &&
 384                               extensions->ARB_draw_instanced &&
 385                               extensions->ARB_uniform_buffer_object &&
 386                               extensions->EXT_texture_snorm &&
 387                               extensions->NV_primitive_restart &&
 388                               extensions->OES_depth_texture_cube_map);
 389    if (ver_3_0) {
 390       return 30;
 391    } else if (ver_2_0) {
 392       return 20;
 393    } else {
 394       return 0;
 395    }
 396 }
 397
 398 GLuint
 399 _mesa_get_version(const struct gl_extensions *extensions,
 400                   struct gl_constants *consts, gl_api api)
 401 {
 402    switch (api) {
 403    case API_OPENGL_COMPAT:
 404       /* Disable GLSL 1.40 and later for legacy contexts.
 405        * This disallows creation of the GL 3.1 compatibility context. */
 406       if (consts->GLSLVersion > 130) {
 407          consts->GLSLVersion = 130;
 408       }
 409       /* fall through */
 410    case API_OPENGL_CORE:
 411       return compute_version(extensions, consts, api);
 412    case API_OPENGLES:
 413       return compute_version_es1(extensions);
 414    case API_OPENGLES2:
 415       return compute_version_es2(extensions);
 416    }
 417    return 0;
 418 }
 419
 420 /**
 421  * Set the context's Version and VersionString fields.
 422  * This should only be called once as part of context initialization
 423  * or to perform version check for GLX_ARB_create_context_profile.
 424  */
 425 void
 426 _mesa_compute_version(struct gl_context *ctx)
 427 {
 428    if (ctx->Version)
 429       return;
 430
 431    ctx->Version = _mesa_get_version(&ctx->Extensions, &ctx->Const, ctx->API);
 432
 433    switch (ctx->API) {
 434    case API_OPENGL_COMPAT:
 435    case API_OPENGL_CORE:
 436       create_version_string(ctx, "");
 437       break;
 438
 439    case API_OPENGLES:
 440       if (!ctx->Version) {
 441          _mesa_problem(ctx, "Incomplete OpenGL ES 1.0 support.");
 442          return;
 443       }
 444       create_version_string(ctx, "OpenGL ES-CM ");
 445       break;
 446
 447    case API_OPENGLES2:
 448       if (!ctx->Version) {
 449          _mesa_problem(ctx, "Incomplete OpenGL ES 2.0 support.");
 450          return;
 451       }
 452       create_version_string(ctx, "OpenGL ES ");
 453       break;
 454    }
 455 }