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 void
 128 _mesa_override_gl_version(struct gl_context *ctx)
 129 {
 130    int version;
 131    GLboolean fwd_context;
 132
 133    get_gl_override(&version, &fwd_context);
 134
 135    if (version > 0) {
 136       ctx->Version = version;
 137       if (version >= 30 && fwd_context) {
 138          ctx->API = API_OPENGL_CORE;
 139          ctx->Const.ContextFlags |= GL_CONTEXT_FLAG_FORWARD_COMPATIBLE_BIT;
 140       } else if (version >= 31) {
 141          ctx->API = API_OPENGL_CORE;
 142       } else {
 143          ctx->API = API_OPENGL_COMPAT;
 144       }
 145       create_version_string(ctx, "");
 146    }
 147 }
 148
 149 /**
 150  * Returns the gl override value
 151  *
 152  * version > 0 indicates there is an override requested
 153  */
 154 int
 155 _mesa_get_gl_version_override(void)
 156 {
 157    int version;
 158    GLboolean fwd_context;
 159
 160    get_gl_override(&version, &fwd_context);
 161
 162    return version;
 163 }
 164
 165 /**
 166  * Override the context's GLSL version if the environment variable
 167  * MESA_GLSL_VERSION_OVERRIDE is set. Valid values for
 168  * MESA_GLSL_VERSION_OVERRIDE are integers, such as "130".
 169  */
 170 void
 171 _mesa_override_glsl_version(struct gl_context *ctx)
 172 {
 173    const char *env_var = "MESA_GLSL_VERSION_OVERRIDE";
 174    const char *version;
 175    int n;
 176
 177    version = getenv(env_var);
 178    if (!version) {
 179       return;
 180    }
 181
 182    n = sscanf(version, "%u", &ctx->Const.GLSLVersion);
 183    if (n != 1) {
 184       fprintf(stderr, "error: invalid value for %s: %s\n", env_var, version);
 185       return;
 186    }
 187 }
 188
 189 /**
 190  * Examine enabled GL extensions to determine GL version.
 191  */
 192 static void
 193 compute_version(struct gl_context *ctx)
 194 {
 195    GLuint major, minor;
 196
 197    const GLboolean ver_1_3 = (ctx->Extensions.ARB_texture_border_clamp &&
 198                               ctx->Extensions.ARB_texture_cube_map &&
 199                               ctx->Extensions.ARB_texture_env_combine &&
 200                               ctx->Extensions.ARB_texture_env_dot3);
 201    const GLboolean ver_1_4 = (ver_1_3 &&
 202                               ctx->Extensions.ARB_depth_texture &&
 203                               ctx->Extensions.ARB_shadow &&
 204                               ctx->Extensions.ARB_texture_env_crossbar &&
 205                               ctx->Extensions.EXT_blend_color &&
 206                               ctx->Extensions.EXT_blend_func_separate &&
 207                               ctx->Extensions.EXT_blend_minmax &&
 208                               ctx->Extensions.EXT_point_parameters);
 209    const GLboolean ver_1_5 = (ver_1_4 &&
 210                               ctx->Extensions.ARB_occlusion_query);
 211    const GLboolean ver_2_0 = (ver_1_5 &&
 212                               ctx->Extensions.ARB_point_sprite &&
 213                               ctx->Extensions.ARB_vertex_shader &&
 214                               ctx->Extensions.ARB_fragment_shader &&
 215                               ctx->Extensions.ARB_texture_non_power_of_two &&
 216                               ctx->Extensions.EXT_blend_equation_separate &&
 217
 218                               /* Technically, 2.0 requires the functionality
 219                                * of the EXT version.  Enable 2.0 if either
 220                                * extension is available, and assume that a
 221                                * driver that only exposes the ATI extension
 222                                * will fallback to software when necessary.
 223                                */
 224                               (ctx->Extensions.EXT_stencil_two_side
 225                                || ctx->Extensions.ATI_separate_stencil));
 226    const GLboolean ver_2_1 = (ver_2_0 &&
 227                               ctx->Const.GLSLVersion >= 120 &&
 228                               ctx->Extensions.EXT_pixel_buffer_object &&
 229                               ctx->Extensions.EXT_texture_sRGB);
 230    const GLboolean ver_3_0 = (ver_2_1 &&
 231                               ctx->Const.GLSLVersion >= 130 &&
 232                               ctx->Const.MaxSamples >= 4 &&
 233                               (ctx->API == API_OPENGL_CORE ||
 234                                ctx->Extensions.ARB_color_buffer_float) &&
 235                               ctx->Extensions.ARB_depth_buffer_float &&
 236                               ctx->Extensions.ARB_half_float_pixel &&
 237                               ctx->Extensions.ARB_half_float_vertex &&
 238                               ctx->Extensions.ARB_map_buffer_range &&
 239                               ctx->Extensions.ARB_shader_texture_lod &&
 240                               ctx->Extensions.ARB_texture_float &&
 241                               ctx->Extensions.ARB_texture_rg &&
 242                               ctx->Extensions.ARB_texture_compression_rgtc &&
 243                               ctx->Extensions.EXT_draw_buffers2 &&
 244                               ctx->Extensions.ARB_framebuffer_object &&
 245                               ctx->Extensions.EXT_framebuffer_sRGB &&
 246                               ctx->Extensions.EXT_packed_float &&
 247                               ctx->Extensions.EXT_texture_array &&
 248                               ctx->Extensions.EXT_texture_shared_exponent &&
 249                               ctx->Extensions.EXT_transform_feedback &&
 250                               ctx->Extensions.NV_conditional_render);
 251    const GLboolean ver_3_1 = (ver_3_0 &&
 252                               ctx->Const.GLSLVersion >= 140 &&
 253                               ctx->Extensions.ARB_draw_instanced &&
 254                               ctx->Extensions.ARB_texture_buffer_object &&
 255                               ctx->Extensions.ARB_uniform_buffer_object &&
 256                               ctx->Extensions.EXT_texture_snorm &&
 257                               ctx->Extensions.NV_primitive_restart &&
 258                               ctx->Extensions.NV_texture_rectangle &&
 259                               ctx->Const.VertexProgram.MaxTextureImageUnits >= 16);
 260    const GLboolean ver_3_2 = (ver_3_1 &&
 261                               ctx->Const.GLSLVersion >= 150 &&
 262                               ctx->Extensions.ARB_depth_clamp &&
 263                               ctx->Extensions.ARB_draw_elements_base_vertex &&
 264                               ctx->Extensions.ARB_fragment_coord_conventions &&
 265                               ctx->Extensions.EXT_provoking_vertex &&
 266                               ctx->Extensions.ARB_seamless_cube_map &&
 267                               ctx->Extensions.ARB_sync &&
 268                               ctx->Extensions.ARB_texture_multisample &&
 269                               ctx->Extensions.EXT_vertex_array_bgra);
 270    const GLboolean ver_3_3 = (ver_3_2 &&
 271                               ctx->Const.GLSLVersion >= 330 &&
 272                               ctx->Extensions.ARB_blend_func_extended &&
 273                               ctx->Extensions.ARB_explicit_attrib_location &&
 274                               ctx->Extensions.ARB_instanced_arrays &&
 275                               ctx->Extensions.ARB_occlusion_query2 &&
 276                               ctx->Extensions.ARB_shader_bit_encoding &&
 277                               ctx->Extensions.ARB_texture_rgb10_a2ui &&
 278                               ctx->Extensions.ARB_timer_query &&
 279                               ctx->Extensions.ARB_vertex_type_2_10_10_10_rev &&
 280                               ctx->Extensions.EXT_texture_swizzle);
 281                               /* ARB_sampler_objects is always enabled in mesa */
 282
 283    if (ver_3_3) {
 284       major = 3;
 285       minor = 3;
 286    }
 287    else if (ver_3_2) {
 288       major = 3;
 289       minor = 2;
 290    }
 291    else if (ver_3_1) {
 292       major = 3;
 293       minor = 1;
 294    }
 295    else if (ver_3_0) {
 296       major = 3;
 297       minor = 0;
 298    }
 299    else if (ver_2_1) {
 300       major = 2;
 301       minor = 1;
 302    }
 303    else if (ver_2_0) {
 304       major = 2;
 305       minor = 0;
 306    }
 307    else if (ver_1_5) {
 308       major = 1;
 309       minor = 5;
 310    }
 311    else if (ver_1_4) {
 312       major = 1;
 313       minor = 4;
 314    }
 315    else if (ver_1_3) {
 316       major = 1;
 317       minor = 3;
 318    }
 319    else {
 320       major = 1;
 321       minor = 2;
 322    }
 323
 324    ctx->Version = major * 10 + minor;
 325
 326    create_version_string(ctx, "");
 327 }
 328
 329 static void
 330 compute_version_es1(struct gl_context *ctx)
 331 {
 332    /* OpenGL ES 1.0 is derived from OpenGL 1.3 */
 333    const GLboolean ver_1_0 = (ctx->Extensions.ARB_texture_env_combine &&
 334                               ctx->Extensions.ARB_texture_env_dot3);
 335    /* OpenGL ES 1.1 is derived from OpenGL 1.5 */
 336    const GLboolean ver_1_1 = (ver_1_0 &&
 337                               ctx->Extensions.EXT_point_parameters);
 338
 339    if (ver_1_1) {
 340       ctx->Version = 11;
 341    } else if (ver_1_0) {
 342       ctx->Version = 10;
 343    } else {
 344       _mesa_problem(ctx, "Incomplete OpenGL ES 1.0 support.");
 345    }
 346
 347    create_version_string(ctx, "OpenGL ES-CM ");
 348 }
 349
 350 static void
 351 compute_version_es2(struct gl_context *ctx)
 352 {
 353    /* OpenGL ES 2.0 is derived from OpenGL 2.0 */
 354    const GLboolean ver_2_0 = (ctx->Extensions.ARB_texture_cube_map &&
 355                               ctx->Extensions.EXT_blend_color &&
 356                               ctx->Extensions.EXT_blend_func_separate &&
 357                               ctx->Extensions.EXT_blend_minmax &&
 358                               ctx->Extensions.ARB_vertex_shader &&
 359                               ctx->Extensions.ARB_fragment_shader &&
 360                               ctx->Extensions.ARB_texture_non_power_of_two &&
 361                               ctx->Extensions.EXT_blend_equation_separate);
 362    /* FINISHME: This list isn't quite right. */
 363    const GLboolean ver_3_0 = (ctx->Extensions.ARB_half_float_vertex &&
 364                               ctx->Extensions.ARB_internalformat_query &&
 365                               ctx->Extensions.ARB_map_buffer_range &&
 366                               ctx->Extensions.ARB_shader_texture_lod &&
 367                               ctx->Extensions.ARB_texture_float &&
 368                               ctx->Extensions.ARB_texture_rg &&
 369                               ctx->Extensions.ARB_texture_compression_rgtc &&
 370                               ctx->Extensions.EXT_draw_buffers2 &&
 371                               /* ctx->Extensions.ARB_framebuffer_object && */
 372                               ctx->Extensions.EXT_framebuffer_sRGB &&
 373                               ctx->Extensions.EXT_packed_float &&
 374                               ctx->Extensions.EXT_texture_array &&
 375                               ctx->Extensions.EXT_texture_shared_exponent &&
 376                               ctx->Extensions.EXT_transform_feedback &&
 377                               ctx->Extensions.NV_conditional_render &&
 378                               ctx->Extensions.ARB_draw_instanced &&
 379                               ctx->Extensions.ARB_uniform_buffer_object &&
 380                               ctx->Extensions.EXT_texture_snorm &&
 381                               ctx->Extensions.NV_primitive_restart &&
 382                               ctx->Extensions.OES_depth_texture_cube_map);
 383    if (ver_3_0) {
 384       ctx->Version = 30;
 385    } else if (ver_2_0) {
 386       ctx->Version = 20;
 387    } else {
 388       _mesa_problem(ctx, "Incomplete OpenGL ES 2.0 support.");
 389    }
 390
 391    create_version_string(ctx, "OpenGL ES ");
 392 }
 393
 394 /**
 395  * Set the context's Version and VersionString fields.
 396  * This should only be called once as part of context initialization
 397  * or to perform version check for GLX_ARB_create_context_profile.
 398  */
 399 void
 400 _mesa_compute_version(struct gl_context *ctx)
 401 {
 402    if (ctx->Version)
 403       return;
 404
 405    switch (ctx->API) {
 406    case API_OPENGL_COMPAT:
 407       /* Disable GLSL 1.40 and later for legacy contexts.
 408        * This disallows creation of the GL 3.1 compatibility context. */
 409       if (ctx->Const.GLSLVersion > 130) {
 410          ctx->Const.GLSLVersion = 130;
 411       }
 412       /* fall through */
 413    case API_OPENGL_CORE:
 414       compute_version(ctx);
 415       break;
 416    case API_OPENGLES:
 417       compute_version_es1(ctx);
 418       break;
 419    case API_OPENGLES2:
 420       compute_version_es2(ctx);
 421       break;
 422    }
 423
 424 }