src/mesa/state_tracker/st_extensions.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
   4  * Copyright (c) 2008 VMware, Inc.
   5  * All Rights Reserved.
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a
   8  * copy of this software and associated documentation files (the
   9  * "Software"), to deal in the Software without restriction, including
  10  * without limitation the rights to use, copy, modify, merge, publish,
  11  * distribute, sub license, and/or sell copies of the Software, and to
  12  * permit persons to whom the Software is furnished to do so, subject to
  13  * the following conditions:
  14  *
  15  * The above copyright notice and this permission notice (including the
  16  * next paragraph) shall be included in all copies or substantial portions
  17  * of the Software.
  18  *
  19  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  20  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  21  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  22  * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
  23  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  24  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  25  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  26  *
  27  **************************************************************************/
  28
  29 #include "main/imports.h"
  30 #include "main/context.h"
  31 #include "main/macros.h"
  32 #include "main/mfeatures.h"
  33 #include "main/version.h"
  34
  35 #include "pipe/p_context.h"
  36 #include "pipe/p_defines.h"
  37 #include "pipe/p_screen.h"
  38
  39 #include "st_context.h"
  40 #include "st_extensions.h"
  41
  42
  43 static int _min(int a, int b)
  44 {
  45    return (a < b) ? a : b;
  46 }
  47
  48 static float _maxf(float a, float b)
  49 {
  50    return (a > b) ? a : b;
  51 }
  52
  53 static int _clamp(int a, int min, int max)
  54 {
  55    if (a < min)
  56       return min;
  57    else if (a > max)
  58       return max;
  59    else
  60       return a;
  61 }
  62
  63
  64 /**
  65  * Query driver to get implementation limits.
  66  * Note that we have to limit/clamp against Mesa's internal limits too.
  67  */
  68 void st_init_limits(struct st_context *st)
  69 {
  70    struct pipe_screen *screen = st->pipe->screen;
  71    struct gl_constants *c = &st->ctx->Const;
  72    gl_shader_type sh;
  73    boolean can_ubo = TRUE;
  74    int max_const_buffers;
  75
  76    c->MaxTextureLevels
  77       = _min(screen->get_param(screen, PIPE_CAP_MAX_TEXTURE_2D_LEVELS),
  78             MAX_TEXTURE_LEVELS);
  79
  80    c->Max3DTextureLevels
  81       = _min(screen->get_param(screen, PIPE_CAP_MAX_TEXTURE_3D_LEVELS),
  82             MAX_3D_TEXTURE_LEVELS);
  83
  84    c->MaxCubeTextureLevels
  85       = _min(screen->get_param(screen, PIPE_CAP_MAX_TEXTURE_CUBE_LEVELS),
  86             MAX_CUBE_TEXTURE_LEVELS);
  87
  88    c->MaxTextureRectSize
  89       = _min(1 << (c->MaxTextureLevels - 1), MAX_TEXTURE_RECT_SIZE);
  90
  91    c->MaxArrayTextureLayers
  92       = screen->get_param(screen, PIPE_CAP_MAX_TEXTURE_ARRAY_LAYERS);
  93
  94    c->MaxTextureImageUnits
  95       = _min(screen->get_shader_param(screen, PIPE_SHADER_FRAGMENT,
  96                                       PIPE_SHADER_CAP_MAX_TEXTURE_SAMPLERS),
  97             MAX_TEXTURE_IMAGE_UNITS);
  98
  99    c->MaxVertexTextureImageUnits
 100       = _min(screen->get_shader_param(screen, PIPE_SHADER_VERTEX,
 101                                       PIPE_SHADER_CAP_MAX_TEXTURE_SAMPLERS),
 102              MAX_VERTEX_TEXTURE_IMAGE_UNITS);
 103
 104    c->MaxCombinedTextureImageUnits
 105       = _min(screen->get_param(screen, PIPE_CAP_MAX_COMBINED_SAMPLERS),
 106              MAX_COMBINED_TEXTURE_IMAGE_UNITS);
 107
 108    c->MaxTextureCoordUnits
 109       = _min(c->MaxTextureImageUnits, MAX_TEXTURE_COORD_UNITS);
 110
 111    c->MaxTextureUnits = _min(c->MaxTextureImageUnits, c->MaxTextureCoordUnits);
 112
 113    /* Define max viewport size and max renderbuffer size in terms of
 114     * max texture size (note: max tex RECT size = max tex 2D size).
 115     * If this isn't true for some hardware we'll need new PIPE_CAP_ queries.
 116     */
 117    c->MaxViewportWidth =
 118    c->MaxViewportHeight =
 119    c->MaxRenderbufferSize = c->MaxTextureRectSize;
 120
 121    c->MaxDrawBuffers
 122       = _clamp(screen->get_param(screen, PIPE_CAP_MAX_RENDER_TARGETS),
 123               1, MAX_DRAW_BUFFERS);
 124
 125    c->MaxDualSourceDrawBuffers
 126       = _clamp(screen->get_param(screen, PIPE_CAP_MAX_DUAL_SOURCE_RENDER_TARGETS),
 127               0, MAX_DRAW_BUFFERS);
 128
 129    c->MaxLineWidth
 130       = _maxf(1.0f, screen->get_paramf(screen,
 131                                        PIPE_CAPF_MAX_LINE_WIDTH));
 132    c->MaxLineWidthAA
 133       = _maxf(1.0f, screen->get_paramf(screen,
 134                                        PIPE_CAPF_MAX_LINE_WIDTH_AA));
 135
 136    c->MaxPointSize
 137       = _maxf(1.0f, screen->get_paramf(screen,
 138                                        PIPE_CAPF_MAX_POINT_WIDTH));
 139    c->MaxPointSizeAA
 140       = _maxf(1.0f, screen->get_paramf(screen,
 141                                        PIPE_CAPF_MAX_POINT_WIDTH_AA));
 142    /* called after _mesa_create_context/_mesa_init_point, fix default user
 143     * settable max point size up
 144     */
 145    st->ctx->Point.MaxSize = MAX2(c->MaxPointSize, c->MaxPointSizeAA);
 146    /* these are not queryable. Note that GL basically mandates a 1.0 minimum
 147     * for non-aa sizes, but we can go down to 0.0 for aa points.
 148     */
 149    c->MinPointSize = 1.0f;
 150    c->MinPointSizeAA = 0.0f;
 151
 152    c->MaxTextureMaxAnisotropy
 153       = _maxf(2.0f, screen->get_paramf(screen,
 154                                  PIPE_CAPF_MAX_TEXTURE_ANISOTROPY));
 155
 156    c->MaxTextureLodBias
 157       = screen->get_paramf(screen, PIPE_CAPF_MAX_TEXTURE_LOD_BIAS);
 158
 159    c->MaxDrawBuffers
 160       = CLAMP(screen->get_param(screen, PIPE_CAP_MAX_RENDER_TARGETS),
 161               1, MAX_DRAW_BUFFERS);
 162
 163    c->QuadsFollowProvokingVertexConvention = screen->get_param(
 164       screen, PIPE_CAP_QUADS_FOLLOW_PROVOKING_VERTEX_CONVENTION);
 165
 166    for (sh = 0; sh < MESA_SHADER_TYPES; ++sh) {
 167       struct gl_shader_compiler_options *options =
 168          &st->ctx->ShaderCompilerOptions[sh];
 169       struct gl_program_constants *pc;
 170
 171       switch (sh) {
 172       case PIPE_SHADER_FRAGMENT:
 173          pc = &c->FragmentProgram;
 174          break;
 175       case PIPE_SHADER_VERTEX:
 176          pc = &c->VertexProgram;
 177          break;
 178       case PIPE_SHADER_GEOMETRY:
 179          pc = &c->GeometryProgram;
 180          break;
 181       default:
 182          assert(0);
 183          continue;
 184       }
 185
 186       pc->MaxNativeInstructions    = screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_INSTRUCTIONS);
 187       pc->MaxNativeAluInstructions = screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_ALU_INSTRUCTIONS);
 188       pc->MaxNativeTexInstructions = screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_TEX_INSTRUCTIONS);
 189       pc->MaxNativeTexIndirections = screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_TEX_INDIRECTIONS);
 190       pc->MaxNativeAttribs         = screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_INPUTS);
 191       pc->MaxNativeTemps           = screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_TEMPS);
 192       pc->MaxNativeAddressRegs     = screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_ADDRS);
 193       pc->MaxNativeParameters      = screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_CONSTS);
 194       pc->MaxUniformComponents     = 4 * MIN2(pc->MaxNativeParameters, MAX_UNIFORMS);
 195       /* raise MaxParameters if native support is higher */
 196       pc->MaxParameters            = MAX2(pc->MaxParameters, pc->MaxNativeParameters);
 197
 198       /* Gallium doesn't really care about local vs. env parameters so use the
 199        * same limits.
 200        */
 201       pc->MaxLocalParams = MIN2(pc->MaxParameters, MAX_PROGRAM_LOCAL_PARAMS);
 202       pc->MaxEnvParams = MIN2(pc->MaxParameters, MAX_PROGRAM_ENV_PARAMS);
 203
 204       options->EmitNoNoise = TRUE;
 205
 206       /* TODO: make these more fine-grained if anyone needs it */
 207       options->MaxIfDepth = screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_CONTROL_FLOW_DEPTH);
 208       options->EmitNoLoops = !screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_CONTROL_FLOW_DEPTH);
 209       options->EmitNoFunctions = !screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_SUBROUTINES);
 210       options->EmitNoMainReturn = !screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_SUBROUTINES);
 211
 212       options->EmitNoCont = !screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_TGSI_CONT_SUPPORTED);
 213
 214       options->EmitNoIndirectInput = !screen->get_shader_param(screen, sh,
 215                                         PIPE_SHADER_CAP_INDIRECT_INPUT_ADDR);
 216       options->EmitNoIndirectOutput = !screen->get_shader_param(screen, sh,
 217                                         PIPE_SHADER_CAP_INDIRECT_OUTPUT_ADDR);
 218       options->EmitNoIndirectTemp = !screen->get_shader_param(screen, sh,
 219                                         PIPE_SHADER_CAP_INDIRECT_TEMP_ADDR);
 220       options->EmitNoIndirectUniform = !screen->get_shader_param(screen, sh,
 221                                         PIPE_SHADER_CAP_INDIRECT_CONST_ADDR);
 222
 223       if (pc->MaxNativeInstructions) {
 224          if (options->EmitNoIndirectUniform)
 225          can_ubo = FALSE;
 226
 227          max_const_buffers = screen->get_shader_param(screen, sh,
 228                                                       PIPE_SHADER_CAP_MAX_CONST_BUFFERS);
 229          /* we need 13 buffers - 1 constant, 12 UBO */
 230          if (max_const_buffers < 13)
 231             can_ubo = FALSE;
 232       }
 233
 234       if (options->EmitNoLoops)
 235          options->MaxUnrollIterations = MIN2(screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_INSTRUCTIONS), 65536);
 236       else
 237          options->MaxUnrollIterations = 255; /* SM3 limit */
 238       options->LowerClipDistance = true;
 239    }
 240
 241    /* PIPE_SHADER_CAP_MAX_INPUTS for the FS specifies the maximum number
 242     * of inputs. It's always 2 colors + N generic inputs. */
 243    c->MaxVarying = screen->get_shader_param(screen, PIPE_SHADER_FRAGMENT,
 244                                             PIPE_SHADER_CAP_MAX_INPUTS);
 245    c->MaxVarying = MIN2(c->MaxVarying, MAX_VARYING);
 246
 247    c->MinProgramTexelOffset = screen->get_param(screen, PIPE_CAP_MIN_TEXEL_OFFSET);
 248    c->MaxProgramTexelOffset = screen->get_param(screen, PIPE_CAP_MAX_TEXEL_OFFSET);
 249
 250    c->UniformBooleanTrue = ~0;
 251
 252    c->MaxTransformFeedbackBuffers =
 253       screen->get_param(screen, PIPE_CAP_MAX_STREAM_OUTPUT_BUFFERS);
 254    c->MaxTransformFeedbackBuffers = MIN2(c->MaxTransformFeedbackBuffers, MAX_FEEDBACK_BUFFERS);
 255    c->MaxTransformFeedbackSeparateComponents =
 256       screen->get_param(screen, PIPE_CAP_MAX_STREAM_OUTPUT_SEPARATE_COMPONENTS);
 257    c->MaxTransformFeedbackInterleavedComponents =
 258       screen->get_param(screen, PIPE_CAP_MAX_STREAM_OUTPUT_INTERLEAVED_COMPONENTS);
 259
 260    c->StripTextureBorder = GL_TRUE;
 261
 262    c->GLSLSkipStrictMaxUniformLimitCheck =
 263       screen->get_param(screen, PIPE_CAP_TGSI_CAN_COMPACT_CONSTANTS);
 264
 265    c->GLSLSkipStrictMaxVaryingLimitCheck =
 266       screen->get_param(screen, PIPE_CAP_TGSI_CAN_COMPACT_VARYINGS);
 267
 268    if (can_ubo)
 269       st->ctx->Extensions.ARB_uniform_buffer_object = GL_TRUE;
 270 }
 271
 272
 273 static GLboolean st_get_s3tc_override(void)
 274 {
 275    const char *override = _mesa_getenv("force_s3tc_enable");
 276    if (override && !strcmp(override, "true"))
 277       return GL_TRUE;
 278    return GL_FALSE;
 279 }
 280
 281 /**
 282  * Given a member \c x of struct gl_extensions, return offset of
 283  * \c x in bytes.
 284  */
 285 #define o(x) offsetof(struct gl_extensions, x)
 286
 287
 288 struct st_extension_cap_mapping {
 289    int extension_offset;
 290    int cap;
 291 };
 292
 293 struct st_extension_format_mapping {
 294    int extension_offset[2];
 295    enum pipe_format format[8];
 296
 297    /* If TRUE, at least one format must be supported for the extensions to be
 298     * advertised. If FALSE, all the formats must be supported. */
 299    GLboolean need_at_least_one;
 300 };
 301
 302 /**
 303  * Enable extensions if certain pipe formats are supported by the driver.
 304  * What extensions will be enabled and what formats must be supported is
 305  * described by the array of st_extension_format_mapping.
 306  *
 307  * target and bind_flags are passed to is_format_supported.
 308  */
 309 static void init_format_extensions(struct st_context *st,
 310                            const struct st_extension_format_mapping *mapping,
 311                            unsigned num_mappings,
 312                            enum pipe_texture_target target,
 313                            unsigned bind_flags)
 314 {
 315    struct pipe_screen *screen = st->pipe->screen;
 316    GLboolean *extensions = (GLboolean *) &st->ctx->Extensions;
 317    unsigned i;
 318    int j;
 319    int num_formats = Elements(mapping->format);
 320    int num_ext = Elements(mapping->extension_offset);
 321
 322    for (i = 0; i < num_mappings; i++) {
 323       int num_supported = 0;
 324
 325       /* Examine each format in the list. */
 326       for (j = 0; j < num_formats && mapping[i].format[j]; j++) {
 327          if (screen->is_format_supported(screen, mapping[i].format[j],
 328                                          target, 0, bind_flags)) {
 329             num_supported++;
 330          }
 331       }
 332
 333       if (!num_supported ||
 334           (!mapping[i].need_at_least_one && num_supported != j)) {
 335          continue;
 336       }
 337
 338       /* Enable all extensions in the list. */
 339       for (j = 0; j < num_ext && mapping[i].extension_offset[j]; j++)
 340          extensions[mapping[i].extension_offset[j]] = GL_TRUE;
 341    }
 342 }
 343
 344 /**
 345  * Use pipe_screen::get_param() to query PIPE_CAP_ values to determine
 346  * which GL extensions are supported.
 347  * Quite a few extensions are always supported because they are standard
 348  * features or can be built on top of other gallium features.
 349  * Some fine tuning may still be needed.
 350  */
 351 void st_init_extensions(struct st_context *st)
 352 {
 353    struct pipe_screen *screen = st->pipe->screen;
 354    struct gl_context *ctx = st->ctx;
 355    int i, glsl_feature_level;
 356    GLboolean *extensions = (GLboolean *) &ctx->Extensions;
 357
 358    static const struct st_extension_cap_mapping cap_mapping[] = {
 359       { o(ARB_base_instance),                PIPE_CAP_START_INSTANCE                   },
 360       { o(ARB_depth_clamp),                  PIPE_CAP_DEPTH_CLIP_DISABLE               },
 361       { o(ARB_depth_texture),                PIPE_CAP_TEXTURE_SHADOW_MAP               },
 362       { o(ARB_draw_buffers_blend),           PIPE_CAP_INDEP_BLEND_FUNC                 },
 363       { o(ARB_draw_instanced),               PIPE_CAP_TGSI_INSTANCEID                  },
 364       { o(ARB_fragment_program_shadow),      PIPE_CAP_TEXTURE_SHADOW_MAP               },
 365       { o(ARB_instanced_arrays),             PIPE_CAP_VERTEX_ELEMENT_INSTANCE_DIVISOR  },
 366       { o(ARB_occlusion_query),              PIPE_CAP_OCCLUSION_QUERY                  },
 367       { o(ARB_occlusion_query2),             PIPE_CAP_OCCLUSION_QUERY                  },
 368       { o(ARB_point_sprite),                 PIPE_CAP_POINT_SPRITE                     },
 369       { o(ARB_seamless_cube_map),            PIPE_CAP_SEAMLESS_CUBE_MAP                },
 370       { o(ARB_shader_stencil_export),        PIPE_CAP_SHADER_STENCIL_EXPORT            },
 371       { o(ARB_shader_texture_lod),           PIPE_CAP_SM3                              },
 372       { o(ARB_shadow),                       PIPE_CAP_TEXTURE_SHADOW_MAP               },
 373       { o(ARB_texture_non_power_of_two),     PIPE_CAP_NPOT_TEXTURES                    },
 374       { o(ARB_transform_feedback2),          PIPE_CAP_STREAM_OUTPUT_PAUSE_RESUME       },
 375       { o(ARB_transform_feedback3),          PIPE_CAP_STREAM_OUTPUT_PAUSE_RESUME       },
 376
 377       { o(EXT_blend_equation_separate),      PIPE_CAP_BLEND_EQUATION_SEPARATE          },
 378       { o(EXT_draw_buffers2),                PIPE_CAP_INDEP_BLEND_ENABLE               },
 379       { o(EXT_shadow_funcs),                 PIPE_CAP_TEXTURE_SHADOW_MAP               },
 380       { o(EXT_stencil_two_side),             PIPE_CAP_TWO_SIDED_STENCIL                },
 381       { o(EXT_texture_array),                PIPE_CAP_MAX_TEXTURE_ARRAY_LAYERS         },
 382       { o(EXT_texture_filter_anisotropic),   PIPE_CAP_ANISOTROPIC_FILTER               },
 383       { o(EXT_texture_mirror_clamp),         PIPE_CAP_TEXTURE_MIRROR_CLAMP             },
 384       { o(EXT_texture_swizzle),              PIPE_CAP_TEXTURE_SWIZZLE                  },
 385       { o(EXT_timer_query),                  PIPE_CAP_TIMER_QUERY                      },
 386       { o(EXT_transform_feedback),           PIPE_CAP_MAX_STREAM_OUTPUT_BUFFERS        },
 387
 388       { o(AMD_seamless_cubemap_per_texture), PIPE_CAP_SEAMLESS_CUBE_MAP_PER_TEXTURE    },
 389       { o(ATI_separate_stencil),             PIPE_CAP_TWO_SIDED_STENCIL                },
 390       { o(ATI_texture_mirror_once),          PIPE_CAP_TEXTURE_MIRROR_CLAMP             },
 391       { o(NV_conditional_render),            PIPE_CAP_CONDITIONAL_RENDER               },
 392       { o(NV_texture_barrier),               PIPE_CAP_TEXTURE_BARRIER                  },
 393       /* GL_NV_point_sprite is not supported by gallium because we don't
 394        * support the GL_POINT_SPRITE_R_MODE_NV option. */
 395       { o(MESA_texture_array),               PIPE_CAP_MAX_TEXTURE_ARRAY_LAYERS         },
 396
 397       { o(OES_standard_derivatives),         PIPE_CAP_SM3                              },
 398       { o(ARB_texture_cube_map_array),       PIPE_CAP_CUBE_MAP_ARRAY                   }
 399    };
 400
 401    /* Required: render target and sampler support */
 402    static const struct st_extension_format_mapping rendertarget_mapping[] = {
 403       { { o(ARB_texture_float) },
 404         { PIPE_FORMAT_R32G32B32A32_FLOAT,
 405           PIPE_FORMAT_R16G16B16A16_FLOAT } },
 406
 407       { { o(ARB_texture_rgb10_a2ui) },
 408         { PIPE_FORMAT_B10G10R10A2_UINT } },
 409
 410       { { o(EXT_framebuffer_sRGB) },
 411         { PIPE_FORMAT_A8B8G8R8_SRGB,
 412           PIPE_FORMAT_B8G8R8A8_SRGB },
 413          GL_TRUE }, /* at least one format must be supported */
 414
 415       { { o(EXT_packed_float) },
 416         { PIPE_FORMAT_R11G11B10_FLOAT } },
 417
 418       { { o(EXT_texture_integer) },
 419         { PIPE_FORMAT_R32G32B32A32_UINT,
 420           PIPE_FORMAT_R32G32B32A32_SINT } },
 421    };
 422
 423    /* Required: depth stencil and sampler support */
 424    static const struct st_extension_format_mapping depthstencil_mapping[] = {
 425       { { o(ARB_depth_buffer_float) },
 426         { PIPE_FORMAT_Z32_FLOAT,
 427           PIPE_FORMAT_Z32_FLOAT_S8X24_UINT } },
 428
 429       { { o(ARB_framebuffer_object),
 430           o(EXT_packed_depth_stencil) },
 431         { PIPE_FORMAT_S8_UINT_Z24_UNORM,
 432           PIPE_FORMAT_Z24_UNORM_S8_UINT },
 433         GL_TRUE }, /* at least one format must be supported */
 434    };
 435
 436    /* Required: sampler support */
 437    static const struct st_extension_format_mapping texture_mapping[] = {
 438       { { o(ARB_texture_compression_rgtc) },
 439         { PIPE_FORMAT_RGTC1_UNORM,
 440           PIPE_FORMAT_RGTC1_SNORM,
 441           PIPE_FORMAT_RGTC2_UNORM,
 442           PIPE_FORMAT_RGTC2_SNORM } },
 443
 444       { { o(ARB_texture_rg) },
 445         { PIPE_FORMAT_R8G8_UNORM } },
 446
 447       { { o(EXT_texture_compression_latc) },
 448         { PIPE_FORMAT_LATC1_UNORM,
 449           PIPE_FORMAT_LATC1_SNORM,
 450           PIPE_FORMAT_LATC2_UNORM,
 451           PIPE_FORMAT_LATC2_SNORM } },
 452
 453       { { o(EXT_texture_compression_s3tc),
 454           o(S3_s3tc) },
 455         { PIPE_FORMAT_DXT1_RGB,
 456           PIPE_FORMAT_DXT1_RGBA,
 457           PIPE_FORMAT_DXT3_RGBA,
 458           PIPE_FORMAT_DXT5_RGBA } },
 459
 460       { { o(EXT_texture_shared_exponent) },
 461         { PIPE_FORMAT_R9G9B9E5_FLOAT } },
 462
 463       { { o(EXT_texture_snorm) },
 464         { PIPE_FORMAT_R8G8B8A8_SNORM } },
 465
 466       { { o(EXT_texture_sRGB),
 467           o(EXT_texture_sRGB_decode) },
 468         { PIPE_FORMAT_A8B8G8R8_SRGB,
 469           PIPE_FORMAT_B8G8R8A8_SRGB },
 470         GL_TRUE }, /* at least one format must be supported */
 471
 472       { { o(ATI_texture_compression_3dc) },
 473         { PIPE_FORMAT_LATC2_UNORM } },
 474
 475       { { o(MESA_ycbcr_texture) },
 476         { PIPE_FORMAT_UYVY,
 477           PIPE_FORMAT_YUYV },
 478         GL_TRUE }, /* at least one format must be supported */
 479
 480       { { o(OES_compressed_ETC1_RGB8_texture) },
 481         { PIPE_FORMAT_ETC1_RGB8 } },
 482    };
 483
 484    /* Required: vertex fetch support. */
 485    static const struct st_extension_format_mapping vertex_mapping[] = {
 486       { { o(ARB_vertex_type_2_10_10_10_rev) },
 487         { PIPE_FORMAT_R10G10B10A2_UNORM,
 488           PIPE_FORMAT_B10G10R10A2_UNORM,
 489           PIPE_FORMAT_R10G10B10A2_SNORM,
 490           PIPE_FORMAT_B10G10R10A2_SNORM,
 491           PIPE_FORMAT_R10G10B10A2_USCALED,
 492           PIPE_FORMAT_B10G10R10A2_USCALED,
 493           PIPE_FORMAT_R10G10B10A2_SSCALED,
 494           PIPE_FORMAT_B10G10R10A2_SSCALED } },
 495    };
 496
 497    /*
 498     * Extensions that are supported by all Gallium drivers:
 499     */
 500    ctx->Extensions.ARB_ES2_compatibility = GL_TRUE;
 501    ctx->Extensions.ARB_draw_elements_base_vertex = GL_TRUE;
 502    ctx->Extensions.ARB_explicit_attrib_location = GL_TRUE;
 503    ctx->Extensions.ARB_fragment_coord_conventions = GL_TRUE;
 504    ctx->Extensions.ARB_fragment_program = GL_TRUE;
 505    ctx->Extensions.ARB_fragment_shader = GL_TRUE;
 506    ctx->Extensions.ARB_half_float_pixel = GL_TRUE;
 507    ctx->Extensions.ARB_half_float_vertex = GL_TRUE;
 508    ctx->Extensions.ARB_map_buffer_range = GL_TRUE;
 509    ctx->Extensions.ARB_shader_objects = GL_TRUE;
 510    ctx->Extensions.ARB_shading_language_100 = GL_TRUE;
 511    ctx->Extensions.ARB_texture_border_clamp = GL_TRUE; /* XXX temp */
 512    ctx->Extensions.ARB_texture_cube_map = GL_TRUE;
 513    ctx->Extensions.ARB_texture_env_combine = GL_TRUE;
 514    ctx->Extensions.ARB_texture_env_crossbar = GL_TRUE;
 515    ctx->Extensions.ARB_texture_env_dot3 = GL_TRUE;
 516    ctx->Extensions.ARB_texture_storage = GL_TRUE;
 517    ctx->Extensions.ARB_vertex_program = GL_TRUE;
 518    ctx->Extensions.ARB_vertex_shader = GL_TRUE;
 519
 520    ctx->Extensions.EXT_blend_color = GL_TRUE;
 521    ctx->Extensions.EXT_blend_func_separate = GL_TRUE;
 522    ctx->Extensions.EXT_blend_minmax = GL_TRUE;
 523    ctx->Extensions.EXT_framebuffer_blit = GL_TRUE;
 524    ctx->Extensions.EXT_framebuffer_object = GL_TRUE;
 525    ctx->Extensions.EXT_framebuffer_multisample = GL_TRUE;
 526    ctx->Extensions.EXT_fog_coord = GL_TRUE;
 527    ctx->Extensions.EXT_gpu_program_parameters = GL_TRUE;
 528    ctx->Extensions.EXT_pixel_buffer_object = GL_TRUE;
 529    ctx->Extensions.EXT_point_parameters = GL_TRUE;
 530    ctx->Extensions.EXT_provoking_vertex = GL_TRUE;
 531    ctx->Extensions.EXT_secondary_color = GL_TRUE;
 532    ctx->Extensions.EXT_separate_shader_objects = GL_TRUE;
 533    ctx->Extensions.EXT_texture_env_dot3 = GL_TRUE;
 534    ctx->Extensions.EXT_vertex_array_bgra = GL_TRUE;
 535
 536    ctx->Extensions.ATI_texture_env_combine3 = GL_TRUE;
 537
 538    ctx->Extensions.MESA_pack_invert = GL_TRUE;
 539
 540    ctx->Extensions.NV_blend_square = GL_TRUE;
 541    ctx->Extensions.NV_fog_distance = GL_TRUE;
 542    ctx->Extensions.NV_texture_env_combine4 = GL_TRUE;
 543    ctx->Extensions.NV_texture_rectangle = GL_TRUE;
 544
 545    ctx->Extensions.OES_EGL_image = GL_TRUE;
 546    if (ctx->API != API_OPENGL_COMPAT)
 547       ctx->Extensions.OES_EGL_image_external = GL_TRUE;
 548    ctx->Extensions.OES_draw_texture = GL_TRUE;
 549
 550    /* Expose the extensions which directly correspond to gallium caps. */
 551    for (i = 0; i < Elements(cap_mapping); i++) {
 552       if (screen->get_param(screen, cap_mapping[i].cap)) {
 553          extensions[cap_mapping[i].extension_offset] = GL_TRUE;
 554       }
 555    }
 556
 557    /* Expose the extensions which directly correspond to gallium formats. */
 558    init_format_extensions(st, rendertarget_mapping,
 559                           Elements(rendertarget_mapping), PIPE_TEXTURE_2D,
 560                           PIPE_BIND_RENDER_TARGET | PIPE_BIND_SAMPLER_VIEW);
 561    init_format_extensions(st, depthstencil_mapping,
 562                           Elements(depthstencil_mapping), PIPE_TEXTURE_2D,
 563                           PIPE_BIND_DEPTH_STENCIL | PIPE_BIND_SAMPLER_VIEW);
 564    init_format_extensions(st, texture_mapping, Elements(texture_mapping),
 565                           PIPE_TEXTURE_2D, PIPE_BIND_SAMPLER_VIEW);
 566    init_format_extensions(st, vertex_mapping, Elements(vertex_mapping),
 567                           PIPE_BUFFER, PIPE_BIND_VERTEX_BUFFER);
 568
 569    /* Figure out GLSL support. */
 570    glsl_feature_level = screen->get_param(screen, PIPE_CAP_GLSL_FEATURE_LEVEL);
 571
 572    if (glsl_feature_level >= 140) {
 573       ctx->Const.GLSLVersion = 140;
 574    } else if (glsl_feature_level >= 130) {
 575       ctx->Const.GLSLVersion = 130;
 576    } else {
 577       ctx->Const.GLSLVersion = 120;
 578    }
 579
 580    _mesa_override_glsl_version(st->ctx);
 581
 582    if (ctx->Const.GLSLVersion >= 130) {
 583       ctx->Const.NativeIntegers = GL_TRUE;
 584       ctx->Const.MaxClipPlanes = 8;
 585
 586       /* Extensions that only depend on GLSL 1.3. */
 587       ctx->Extensions.ARB_conservative_depth = GL_TRUE;
 588       ctx->Extensions.ARB_shader_bit_encoding = GL_TRUE;
 589    } else {
 590       /* Optional integer support for GLSL 1.2. */
 591       if (screen->get_shader_param(screen, PIPE_SHADER_VERTEX,
 592                                    PIPE_SHADER_CAP_INTEGERS) &&
 593           screen->get_shader_param(screen, PIPE_SHADER_FRAGMENT,
 594                                    PIPE_SHADER_CAP_INTEGERS)) {
 595          ctx->Const.NativeIntegers = GL_TRUE;
 596       }
 597    }
 598
 599    /* Below are the cases which cannot be moved into tables easily. */
 600
 601    if (!ctx->Mesa_DXTn && !st_get_s3tc_override()) {
 602       ctx->Extensions.EXT_texture_compression_s3tc = GL_FALSE;
 603       ctx->Extensions.S3_s3tc = GL_FALSE;
 604    }
 605
 606    if (screen->get_shader_param(screen, PIPE_SHADER_GEOMETRY,
 607                                 PIPE_SHADER_CAP_MAX_INSTRUCTIONS) > 0) {
 608 #if 0 /* XXX re-enable when GLSL compiler again supports geometry shaders */
 609       ctx->Extensions.ARB_geometry_shader4 = GL_TRUE;
 610 #endif
 611    }
 612
 613    ctx->Extensions.NV_primitive_restart = GL_TRUE;
 614    if (!screen->get_param(screen, PIPE_CAP_PRIMITIVE_RESTART)) {
 615       ctx->Const.PrimitiveRestartInSoftware = GL_TRUE;
 616    }
 617
 618    if (screen->get_param(screen, PIPE_CAP_VERTEX_COLOR_UNCLAMPED)) {
 619       ctx->Extensions.ARB_color_buffer_float = GL_TRUE;
 620
 621       if (!screen->get_param(screen, PIPE_CAP_VERTEX_COLOR_CLAMPED)) {
 622          st->clamp_vert_color_in_shader = TRUE;
 623       }
 624
 625       if (!screen->get_param(screen, PIPE_CAP_FRAGMENT_COLOR_CLAMPED)) {
 626          st->clamp_frag_color_in_shader = TRUE;
 627       }
 628    }
 629
 630    if (screen->fence_finish) {
 631       ctx->Extensions.ARB_sync = GL_TRUE;
 632    }
 633
 634    /* Maximum sample count. */
 635    for (i = 16; i > 0; --i) {
 636       if (screen->is_format_supported(screen, PIPE_FORMAT_B8G8R8A8_UNORM,
 637                                       PIPE_TEXTURE_2D, i,
 638                                       PIPE_BIND_RENDER_TARGET)) {
 639          ctx->Const.MaxSamples = i;
 640          break;
 641       }
 642    }
 643
 644    if (ctx->Const.MaxDualSourceDrawBuffers > 0)
 645       ctx->Extensions.ARB_blend_func_extended = GL_TRUE;
 646
 647    if (screen->get_param(screen, PIPE_CAP_TIMER_QUERY) &&
 648        screen->get_param(screen, PIPE_CAP_QUERY_TIMESTAMP)) {
 649       ctx->Extensions.ARB_timer_query = GL_TRUE;
 650    }
 651
 652    if (ctx->Extensions.ARB_transform_feedback2 &&
 653        ctx->Extensions.ARB_draw_instanced) {
 654       ctx->Extensions.ARB_transform_feedback_instanced = GL_TRUE;
 655    }
 656    if (st->options.force_glsl_extensions_warn)
 657            ctx->Const.ForceGLSLExtensionsWarn = 1;
 658
 659    ctx->Const.MinMapBufferAlignment =
 660       screen->get_param(screen, PIPE_CAP_MIN_MAP_BUFFER_ALIGNMENT);
 661    if (ctx->Const.MinMapBufferAlignment >= 64) {
 662       ctx->Extensions.ARB_map_buffer_alignment = GL_TRUE;
 663    }
 664    if (screen->get_param(screen, PIPE_CAP_TEXTURE_BUFFER_OBJECTS))
 665       ctx->Extensions.ARB_texture_buffer_object = GL_TRUE;
 666
 667    /* Unpacking a varying in the fragment shader costs 1 texture indirection.
 668     * If the number of available texture indirections is very limited, then we
 669     * prefer to disable varying packing rather than run the risk of varying
 670     * packing preventing a shader from running.
 671     */
 672    if (screen->get_shader_param(screen, PIPE_SHADER_FRAGMENT,
 673                                 PIPE_SHADER_CAP_MAX_TEX_INDIRECTIONS) <= 8) {
 674       /* We can't disable varying packing if transform feedback is available,
 675        * because transform feedback code assumes a packed varying layout.
 676        */
 677       if (!ctx->Extensions.EXT_transform_feedback)
 678          ctx->Const.DisableVaryingPacking = GL_TRUE;
 679    }
 680 }