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 void
 204 compute_version(struct gl_context *ctx)
 205 {
 206    GLuint major, minor;
 207
 208    const GLboolean ver_1_3 = (ctx->Extensions.ARB_texture_border_clamp &&
 209                               ctx->Extensions.ARB_texture_cube_map &&
 210                               ctx->Extensions.ARB_texture_env_combine &&
 211                               ctx->Extensions.ARB_texture_env_dot3);
 212    const GLboolean ver_1_4 = (ver_1_3 &&
 213                               ctx->Extensions.ARB_depth_texture &&
 214                               ctx->Extensions.ARB_shadow &&
 215                               ctx->Extensions.ARB_texture_env_crossbar &&
 216                               ctx->Extensions.EXT_blend_color &&
 217                               ctx->Extensions.EXT_blend_func_separate &&
 218                               ctx->Extensions.EXT_blend_minmax &&
 219                               ctx->Extensions.EXT_point_parameters);
 220    const GLboolean ver_1_5 = (ver_1_4 &&
 221                               ctx->Extensions.ARB_occlusion_query);
 222    const GLboolean ver_2_0 = (ver_1_5 &&
 223                               ctx->Extensions.ARB_point_sprite &&
 224                               ctx->Extensions.ARB_vertex_shader &&
 225                               ctx->Extensions.ARB_fragment_shader &&
 226                               ctx->Extensions.ARB_texture_non_power_of_two &&
 227                               ctx->Extensions.EXT_blend_equation_separate &&
 228
 229                               /* Technically, 2.0 requires the functionality
 230                                * of the EXT version.  Enable 2.0 if either
 231                                * extension is available, and assume that a
 232                                * driver that only exposes the ATI extension
 233                                * will fallback to software when necessary.
 234                                */
 235                               (ctx->Extensions.EXT_stencil_two_side
 236                                || ctx->Extensions.ATI_separate_stencil));
 237    const GLboolean ver_2_1 = (ver_2_0 &&
 238                               ctx->Extensions.EXT_pixel_buffer_object &&
 239                               ctx->Extensions.EXT_texture_sRGB);
 240    const GLboolean ver_3_0 = (ver_2_1 &&
 241                               ctx->Const.GLSLVersion >= 130 &&
 242                               (ctx->Const.MaxSamples >= 4 || ctx->Const.FakeSWMSAA) &&
 243                               (ctx->API == API_OPENGL_CORE ||
 244                                ctx->Extensions.ARB_color_buffer_float) &&
 245                               ctx->Extensions.ARB_depth_buffer_float &&
 246                               ctx->Extensions.ARB_half_float_vertex &&
 247                               ctx->Extensions.ARB_map_buffer_range &&
 248                               ctx->Extensions.ARB_shader_texture_lod &&
 249                               ctx->Extensions.ARB_texture_float &&
 250                               ctx->Extensions.ARB_texture_rg &&
 251                               ctx->Extensions.ARB_texture_compression_rgtc &&
 252                               ctx->Extensions.EXT_draw_buffers2 &&
 253                               ctx->Extensions.ARB_framebuffer_object &&
 254                               ctx->Extensions.EXT_framebuffer_sRGB &&
 255                               ctx->Extensions.EXT_packed_float &&
 256                               ctx->Extensions.EXT_texture_array &&
 257                               ctx->Extensions.EXT_texture_shared_exponent &&
 258                               ctx->Extensions.EXT_transform_feedback &&
 259                               ctx->Extensions.NV_conditional_render);
 260    const GLboolean ver_3_1 = (ver_3_0 &&
 261                               ctx->Const.GLSLVersion >= 140 &&
 262                               ctx->Extensions.ARB_draw_instanced &&
 263                               ctx->Extensions.ARB_texture_buffer_object &&
 264                               ctx->Extensions.ARB_uniform_buffer_object &&
 265                               ctx->Extensions.EXT_texture_snorm &&
 266                               ctx->Extensions.NV_primitive_restart &&
 267                               ctx->Extensions.NV_texture_rectangle &&
 268                               ctx->Const.Program[MESA_SHADER_VERTEX].MaxTextureImageUnits >= 16);
 269    const GLboolean ver_3_2 = (ver_3_1 &&
 270                               ctx->Const.GLSLVersion >= 150 &&
 271                               ctx->Extensions.ARB_depth_clamp &&
 272                               ctx->Extensions.ARB_draw_elements_base_vertex &&
 273                               ctx->Extensions.ARB_fragment_coord_conventions &&
 274                               ctx->Extensions.EXT_provoking_vertex &&
 275                               ctx->Extensions.ARB_seamless_cube_map &&
 276                               ctx->Extensions.ARB_sync &&
 277                               ctx->Extensions.ARB_texture_multisample &&
 278                               ctx->Extensions.EXT_vertex_array_bgra);
 279    const GLboolean ver_3_3 = (ver_3_2 &&
 280                               ctx->Const.GLSLVersion >= 330 &&
 281                               ctx->Extensions.ARB_blend_func_extended &&
 282                               ctx->Extensions.ARB_explicit_attrib_location &&
 283                               ctx->Extensions.ARB_instanced_arrays &&
 284                               ctx->Extensions.ARB_occlusion_query2 &&
 285                               ctx->Extensions.ARB_shader_bit_encoding &&
 286                               ctx->Extensions.ARB_texture_rgb10_a2ui &&
 287                               ctx->Extensions.ARB_timer_query &&
 288                               ctx->Extensions.ARB_vertex_type_2_10_10_10_rev &&
 289                               ctx->Extensions.EXT_texture_swizzle);
 290                               /* ARB_sampler_objects is always enabled in mesa */
 291
 292    if (ver_3_3) {
 293       major = 3;
 294       minor = 3;
 295    }
 296    else if (ver_3_2) {
 297       major = 3;
 298       minor = 2;
 299    }
 300    else if (ver_3_1) {
 301       major = 3;
 302       minor = 1;
 303    }
 304    else if (ver_3_0) {
 305       major = 3;
 306       minor = 0;
 307    }
 308    else if (ver_2_1) {
 309       major = 2;
 310       minor = 1;
 311    }
 312    else if (ver_2_0) {
 313       major = 2;
 314       minor = 0;
 315    }
 316    else if (ver_1_5) {
 317       major = 1;
 318       minor = 5;
 319    }
 320    else if (ver_1_4) {
 321       major = 1;
 322       minor = 4;
 323    }
 324    else if (ver_1_3) {
 325       major = 1;
 326       minor = 3;
 327    }
 328    else {
 329       major = 1;
 330       minor = 2;
 331    }
 332
 333    ctx->Version = major * 10 + minor;
 334
 335    create_version_string(ctx, "");
 336 }
 337
 338 static void
 339 compute_version_es1(struct gl_context *ctx)
 340 {
 341    /* OpenGL ES 1.0 is derived from OpenGL 1.3 */
 342    const GLboolean ver_1_0 = (ctx->Extensions.ARB_texture_env_combine &&
 343                               ctx->Extensions.ARB_texture_env_dot3);
 344    /* OpenGL ES 1.1 is derived from OpenGL 1.5 */
 345    const GLboolean ver_1_1 = (ver_1_0 &&
 346                               ctx->Extensions.EXT_point_parameters);
 347
 348    if (ver_1_1) {
 349       ctx->Version = 11;
 350    } else if (ver_1_0) {
 351       ctx->Version = 10;
 352    } else {
 353       _mesa_problem(ctx, "Incomplete OpenGL ES 1.0 support.");
 354    }
 355
 356    create_version_string(ctx, "OpenGL ES-CM ");
 357 }
 358
 359 static void
 360 compute_version_es2(struct gl_context *ctx)
 361 {
 362    /* OpenGL ES 2.0 is derived from OpenGL 2.0 */
 363    const GLboolean ver_2_0 = (ctx->Extensions.ARB_texture_cube_map &&
 364                               ctx->Extensions.EXT_blend_color &&
 365                               ctx->Extensions.EXT_blend_func_separate &&
 366                               ctx->Extensions.EXT_blend_minmax &&
 367                               ctx->Extensions.ARB_vertex_shader &&
 368                               ctx->Extensions.ARB_fragment_shader &&
 369                               ctx->Extensions.ARB_texture_non_power_of_two &&
 370                               ctx->Extensions.EXT_blend_equation_separate);
 371    /* FINISHME: This list isn't quite right. */
 372    const GLboolean ver_3_0 = (ctx->Extensions.ARB_half_float_vertex &&
 373                               ctx->Extensions.ARB_internalformat_query &&
 374                               ctx->Extensions.ARB_map_buffer_range &&
 375                               ctx->Extensions.ARB_shader_texture_lod &&
 376                               ctx->Extensions.ARB_texture_float &&
 377                               ctx->Extensions.ARB_texture_rg &&
 378                               ctx->Extensions.ARB_texture_compression_rgtc &&
 379                               ctx->Extensions.EXT_draw_buffers2 &&
 380                               /* ctx->Extensions.ARB_framebuffer_object && */
 381                               ctx->Extensions.EXT_framebuffer_sRGB &&
 382                               ctx->Extensions.EXT_packed_float &&
 383                               ctx->Extensions.EXT_texture_array &&
 384                               ctx->Extensions.EXT_texture_shared_exponent &&
 385                               ctx->Extensions.EXT_transform_feedback &&
 386                               ctx->Extensions.NV_conditional_render &&
 387                               ctx->Extensions.ARB_draw_instanced &&
 388                               ctx->Extensions.ARB_uniform_buffer_object &&
 389                               ctx->Extensions.EXT_texture_snorm &&
 390                               ctx->Extensions.NV_primitive_restart &&
 391                               ctx->Extensions.OES_depth_texture_cube_map);
 392    if (ver_3_0) {
 393       ctx->Version = 30;
 394    } else if (ver_2_0) {
 395       ctx->Version = 20;
 396    } else {
 397       _mesa_problem(ctx, "Incomplete OpenGL ES 2.0 support.");
 398    }
 399
 400    create_version_string(ctx, "OpenGL ES ");
 401 }
 402
 403 /**
 404  * Set the context's Version and VersionString fields.
 405  * This should only be called once as part of context initialization
 406  * or to perform version check for GLX_ARB_create_context_profile.
 407  */
 408 void
 409 _mesa_compute_version(struct gl_context *ctx)
 410 {
 411    if (ctx->Version)
 412       return;
 413
 414    switch (ctx->API) {
 415    case API_OPENGL_COMPAT:
 416       /* Disable GLSL 1.40 and later for legacy contexts.
 417        * This disallows creation of the GL 3.1 compatibility context. */
 418       if (ctx->Const.GLSLVersion > 130) {
 419          ctx->Const.GLSLVersion = 130;
 420       }
 421       /* fall through */
 422    case API_OPENGL_CORE:
 423       compute_version(ctx);
 424       break;
 425    case API_OPENGLES:
 426       compute_version_es1(ctx);
 427       break;
 428    case API_OPENGLES2:
 429       compute_version_es2(ctx);
 430       break;
 431    }
 432
 433 }