src/mesa/state_tracker/st_extensions.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2007 VMware, Inc.
   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 VMWARE 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/version.h"
  33
  34 #include "pipe/p_context.h"
  35 #include "pipe/p_defines.h"
  36 #include "pipe/p_screen.h"
  37 #include "util/u_math.h"
  38
  39 #include "st_context.h"
  40 #include "st_debug.h"
  41 #include "st_extensions.h"
  42 #include "st_format.h"
  43
  44
  45 /*
  46  * Note: we use these function rather than the MIN2, MAX2, CLAMP macros to
  47  * avoid evaluating arguments (which are often function calls) more than once.
  48  */
  49
  50 static unsigned _min(unsigned a, unsigned b)
  51 {
  52    return (a < b) ? a : b;
  53 }
  54
  55 static float _maxf(float a, float b)
  56 {
  57    return (a > b) ? a : b;
  58 }
  59
  60 static int _clamp(int a, int min, int max)
  61 {
  62    if (a < min)
  63       return min;
  64    else if (a > max)
  65       return max;
  66    else
  67       return a;
  68 }
  69
  70
  71 /**
  72  * Query driver to get implementation limits.
  73  * Note that we have to limit/clamp against Mesa's internal limits too.
  74  */
  75 void st_init_limits(struct pipe_screen *screen,
  76                     struct gl_constants *c, struct gl_extensions *extensions)
  77 {
  78    int supported_irs;
  79    unsigned sh;
  80    boolean can_ubo = TRUE;
  81
  82    c->MaxTextureLevels
  83       = _min(screen->get_param(screen, PIPE_CAP_MAX_TEXTURE_2D_LEVELS),
  84             MAX_TEXTURE_LEVELS);
  85
  86    c->Max3DTextureLevels
  87       = _min(screen->get_param(screen, PIPE_CAP_MAX_TEXTURE_3D_LEVELS),
  88             MAX_3D_TEXTURE_LEVELS);
  89
  90    c->MaxCubeTextureLevels
  91       = _min(screen->get_param(screen, PIPE_CAP_MAX_TEXTURE_CUBE_LEVELS),
  92             MAX_CUBE_TEXTURE_LEVELS);
  93
  94    c->MaxTextureRectSize
  95       = _min(1 << (c->MaxTextureLevels - 1), MAX_TEXTURE_RECT_SIZE);
  96
  97    c->MaxArrayTextureLayers
  98       = screen->get_param(screen, PIPE_CAP_MAX_TEXTURE_ARRAY_LAYERS);
  99
 100    /* Define max viewport size and max renderbuffer size in terms of
 101     * max texture size (note: max tex RECT size = max tex 2D size).
 102     * If this isn't true for some hardware we'll need new PIPE_CAP_ queries.
 103     */
 104    c->MaxViewportWidth =
 105    c->MaxViewportHeight =
 106    c->MaxRenderbufferSize = c->MaxTextureRectSize;
 107
 108    c->ViewportSubpixelBits =
 109       screen->get_param(screen, PIPE_CAP_VIEWPORT_SUBPIXEL_BITS);
 110
 111    c->MaxDrawBuffers = c->MaxColorAttachments =
 112       _clamp(screen->get_param(screen, PIPE_CAP_MAX_RENDER_TARGETS),
 113              1, MAX_DRAW_BUFFERS);
 114
 115    c->MaxDualSourceDrawBuffers =
 116       _clamp(screen->get_param(screen,
 117                                PIPE_CAP_MAX_DUAL_SOURCE_RENDER_TARGETS),
 118              0, MAX_DRAW_BUFFERS);
 119
 120    c->MaxLineWidth =
 121       _maxf(1.0f, screen->get_paramf(screen, PIPE_CAPF_MAX_LINE_WIDTH));
 122    c->MaxLineWidthAA =
 123       _maxf(1.0f, screen->get_paramf(screen, PIPE_CAPF_MAX_LINE_WIDTH_AA));
 124
 125    c->MaxPointSize =
 126       _maxf(1.0f, screen->get_paramf(screen, PIPE_CAPF_MAX_POINT_WIDTH));
 127    c->MaxPointSizeAA =
 128       _maxf(1.0f, screen->get_paramf(screen, PIPE_CAPF_MAX_POINT_WIDTH_AA));
 129
 130    /* these are not queryable. Note that GL basically mandates a 1.0 minimum
 131     * for non-aa sizes, but we can go down to 0.0 for aa points.
 132     */
 133    c->MinPointSize = 1.0f;
 134    c->MinPointSizeAA = 0.0f;
 135
 136    c->MaxTextureMaxAnisotropy =
 137       _maxf(2.0f,
 138             screen->get_paramf(screen, PIPE_CAPF_MAX_TEXTURE_ANISOTROPY));
 139
 140    c->MaxTextureLodBias =
 141       screen->get_paramf(screen, PIPE_CAPF_MAX_TEXTURE_LOD_BIAS);
 142
 143    c->QuadsFollowProvokingVertexConvention =
 144       screen->get_param(screen,
 145                         PIPE_CAP_QUADS_FOLLOW_PROVOKING_VERTEX_CONVENTION);
 146
 147    c->MaxUniformBlockSize =
 148       screen->get_shader_param(screen, PIPE_SHADER_FRAGMENT,
 149                                PIPE_SHADER_CAP_MAX_CONST_BUFFER_SIZE);
 150    if (c->MaxUniformBlockSize < 16384) {
 151       can_ubo = FALSE;
 152    }
 153
 154    for (sh = 0; sh < PIPE_SHADER_TYPES; ++sh) {
 155       struct gl_shader_compiler_options *options;
 156       struct gl_program_constants *pc;
 157
 158       switch (sh) {
 159       case PIPE_SHADER_FRAGMENT:
 160          pc = &c->Program[MESA_SHADER_FRAGMENT];
 161          options = &c->ShaderCompilerOptions[MESA_SHADER_FRAGMENT];
 162          break;
 163       case PIPE_SHADER_VERTEX:
 164          pc = &c->Program[MESA_SHADER_VERTEX];
 165          options = &c->ShaderCompilerOptions[MESA_SHADER_VERTEX];
 166          break;
 167       case PIPE_SHADER_GEOMETRY:
 168          pc = &c->Program[MESA_SHADER_GEOMETRY];
 169          options = &c->ShaderCompilerOptions[MESA_SHADER_GEOMETRY];
 170          break;
 171       case PIPE_SHADER_TESS_CTRL:
 172          pc = &c->Program[MESA_SHADER_TESS_CTRL];
 173          options = &c->ShaderCompilerOptions[MESA_SHADER_TESS_CTRL];
 174          break;
 175       case PIPE_SHADER_TESS_EVAL:
 176          pc = &c->Program[MESA_SHADER_TESS_EVAL];
 177          options = &c->ShaderCompilerOptions[MESA_SHADER_TESS_EVAL];
 178          break;
 179       case PIPE_SHADER_COMPUTE:
 180          pc = &c->Program[MESA_SHADER_COMPUTE];
 181          options = &c->ShaderCompilerOptions[MESA_SHADER_COMPUTE];
 182
 183          if (!screen->get_param(screen, PIPE_CAP_COMPUTE))
 184             continue;
 185          supported_irs =
 186             screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_SUPPORTED_IRS);
 187          if (!(supported_irs & (1 << PIPE_SHADER_IR_TGSI)))
 188             continue;
 189          break;
 190       default:
 191          assert(0);
 192       }
 193
 194       pc->MaxTextureImageUnits =
 195          _min(screen->get_shader_param(screen, sh,
 196                                        PIPE_SHADER_CAP_MAX_TEXTURE_SAMPLERS),
 197               MAX_TEXTURE_IMAGE_UNITS);
 198
 199       pc->MaxInstructions =
 200       pc->MaxNativeInstructions =
 201          screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_INSTRUCTIONS);
 202       pc->MaxAluInstructions =
 203       pc->MaxNativeAluInstructions =
 204          screen->get_shader_param(screen, sh,
 205                                   PIPE_SHADER_CAP_MAX_ALU_INSTRUCTIONS);
 206       pc->MaxTexInstructions =
 207       pc->MaxNativeTexInstructions =
 208          screen->get_shader_param(screen, sh,
 209                                   PIPE_SHADER_CAP_MAX_TEX_INSTRUCTIONS);
 210       pc->MaxTexIndirections =
 211       pc->MaxNativeTexIndirections =
 212          screen->get_shader_param(screen, sh,
 213                                   PIPE_SHADER_CAP_MAX_TEX_INDIRECTIONS);
 214       pc->MaxAttribs =
 215       pc->MaxNativeAttribs =
 216          screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_INPUTS);
 217       pc->MaxTemps =
 218       pc->MaxNativeTemps =
 219          screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_TEMPS);
 220       pc->MaxAddressRegs =
 221       pc->MaxNativeAddressRegs = sh == PIPE_SHADER_VERTEX ? 1 : 0;
 222       pc->MaxParameters =
 223       pc->MaxNativeParameters =
 224          screen->get_shader_param(screen, sh,
 225                    PIPE_SHADER_CAP_MAX_CONST_BUFFER_SIZE) / sizeof(float[4]);
 226       pc->MaxInputComponents =
 227          screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_INPUTS) * 4;
 228       pc->MaxOutputComponents =
 229          screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_OUTPUTS) * 4;
 230
 231       pc->MaxUniformComponents =
 232          4 * MIN2(pc->MaxNativeParameters, MAX_UNIFORMS);
 233
 234       pc->MaxUniformBlocks =
 235          screen->get_shader_param(screen, sh,
 236                                   PIPE_SHADER_CAP_MAX_CONST_BUFFERS);
 237       if (pc->MaxUniformBlocks)
 238          pc->MaxUniformBlocks -= 1; /* The first one is for ordinary uniforms. */
 239       pc->MaxUniformBlocks = _min(pc->MaxUniformBlocks, MAX_UNIFORM_BUFFERS);
 240
 241       pc->MaxCombinedUniformComponents = (pc->MaxUniformComponents +
 242                                           c->MaxUniformBlockSize / 4 *
 243                                           pc->MaxUniformBlocks);
 244
 245       pc->MaxAtomicCounters = MAX_ATOMIC_COUNTERS;
 246       pc->MaxAtomicBuffers = screen->get_shader_param(
 247             screen, sh, PIPE_SHADER_CAP_MAX_SHADER_BUFFERS) / 2;
 248       pc->MaxShaderStorageBlocks = pc->MaxAtomicBuffers;
 249
 250       pc->MaxImageUniforms = screen->get_shader_param(
 251             screen, sh, PIPE_SHADER_CAP_MAX_SHADER_IMAGES);
 252
 253       /* Gallium doesn't really care about local vs. env parameters so use the
 254        * same limits.
 255        */
 256       pc->MaxLocalParams = MIN2(pc->MaxParameters, MAX_PROGRAM_LOCAL_PARAMS);
 257       pc->MaxEnvParams = MIN2(pc->MaxParameters, MAX_PROGRAM_ENV_PARAMS);
 258
 259       if (screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_INTEGERS)) {
 260          pc->LowInt.RangeMin = 31;
 261          pc->LowInt.RangeMax = 30;
 262          pc->LowInt.Precision = 0;
 263          pc->MediumInt = pc->HighInt = pc->LowInt;
 264       }
 265
 266       options->EmitNoNoise = TRUE;
 267
 268       /* TODO: make these more fine-grained if anyone needs it */
 269       options->MaxIfDepth =
 270          screen->get_shader_param(screen, sh,
 271                                   PIPE_SHADER_CAP_MAX_CONTROL_FLOW_DEPTH);
 272       options->EmitNoLoops =
 273          !screen->get_shader_param(screen, sh,
 274                                    PIPE_SHADER_CAP_MAX_CONTROL_FLOW_DEPTH);
 275       options->EmitNoFunctions =
 276          !screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_SUBROUTINES);
 277       options->EmitNoMainReturn =
 278          !screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_SUBROUTINES);
 279
 280       options->EmitNoCont =
 281          !screen->get_shader_param(screen, sh,
 282                                    PIPE_SHADER_CAP_TGSI_CONT_SUPPORTED);
 283
 284       options->EmitNoIndirectInput =
 285          !screen->get_shader_param(screen, sh,
 286                                    PIPE_SHADER_CAP_INDIRECT_INPUT_ADDR);
 287       options->EmitNoIndirectOutput =
 288          !screen->get_shader_param(screen, sh,
 289                                    PIPE_SHADER_CAP_INDIRECT_OUTPUT_ADDR);
 290       options->EmitNoIndirectTemp =
 291          !screen->get_shader_param(screen, sh,
 292                                    PIPE_SHADER_CAP_INDIRECT_TEMP_ADDR);
 293       options->EmitNoIndirectUniform =
 294          !screen->get_shader_param(screen, sh,
 295                                    PIPE_SHADER_CAP_INDIRECT_CONST_ADDR);
 296
 297       if (pc->MaxNativeInstructions &&
 298           (options->EmitNoIndirectUniform || pc->MaxUniformBlocks < 12)) {
 299          can_ubo = FALSE;
 300       }
 301
 302       if (options->EmitNoLoops)
 303          options->MaxUnrollIterations =
 304             MIN2(screen->get_shader_param(screen, sh,
 305                                           PIPE_SHADER_CAP_MAX_INSTRUCTIONS),
 306                  65536);
 307       else
 308          options->MaxUnrollIterations =
 309             screen->get_shader_param(screen, sh,
 310                                   PIPE_SHADER_CAP_MAX_UNROLL_ITERATIONS_HINT);
 311
 312       options->LowerCombinedClipCullDistance = true;
 313       options->LowerBufferInterfaceBlocks = true;
 314
 315       if (sh == PIPE_SHADER_COMPUTE)
 316          options->LowerShaderSharedVariables = true;
 317    }
 318
 319    c->LowerTessLevel = true;
 320    c->LowerCsDerivedVariables = true;
 321    c->PrimitiveRestartForPatches =
 322       screen->get_param(screen, PIPE_CAP_PRIMITIVE_RESTART_FOR_PATCHES);
 323
 324    c->MaxCombinedTextureImageUnits =
 325          _min(c->Program[MESA_SHADER_VERTEX].MaxTextureImageUnits +
 326               c->Program[MESA_SHADER_TESS_CTRL].MaxTextureImageUnits +
 327               c->Program[MESA_SHADER_TESS_EVAL].MaxTextureImageUnits +
 328               c->Program[MESA_SHADER_GEOMETRY].MaxTextureImageUnits +
 329               c->Program[MESA_SHADER_FRAGMENT].MaxTextureImageUnits +
 330               c->Program[MESA_SHADER_COMPUTE].MaxTextureImageUnits,
 331               MAX_COMBINED_TEXTURE_IMAGE_UNITS);
 332
 333    /* This depends on program constants. */
 334    c->MaxTextureCoordUnits
 335       = _min(c->Program[MESA_SHADER_FRAGMENT].MaxTextureImageUnits,
 336              MAX_TEXTURE_COORD_UNITS);
 337
 338    c->MaxTextureUnits =
 339       _min(c->Program[MESA_SHADER_FRAGMENT].MaxTextureImageUnits,
 340            c->MaxTextureCoordUnits);
 341
 342    c->Program[MESA_SHADER_VERTEX].MaxAttribs =
 343       MIN2(c->Program[MESA_SHADER_VERTEX].MaxAttribs, 16);
 344
 345    /* PIPE_SHADER_CAP_MAX_INPUTS for the FS specifies the maximum number
 346     * of inputs. It's always 2 colors + N generic inputs. */
 347    c->MaxVarying = screen->get_shader_param(screen, PIPE_SHADER_FRAGMENT,
 348                                             PIPE_SHADER_CAP_MAX_INPUTS);
 349    c->MaxVarying = MIN2(c->MaxVarying, MAX_VARYING);
 350    c->MaxGeometryOutputVertices =
 351       screen->get_param(screen, PIPE_CAP_MAX_GEOMETRY_OUTPUT_VERTICES);
 352    c->MaxGeometryTotalOutputComponents =
 353       screen->get_param(screen, PIPE_CAP_MAX_GEOMETRY_TOTAL_OUTPUT_COMPONENTS);
 354    c->MaxTessPatchComponents =
 355       MAX2(screen->get_param(screen, PIPE_CAP_MAX_SHADER_PATCH_VARYINGS),
 356            MAX_VARYING) * 4;
 357
 358    c->MinProgramTexelOffset =
 359       screen->get_param(screen, PIPE_CAP_MIN_TEXEL_OFFSET);
 360    c->MaxProgramTexelOffset =
 361       screen->get_param(screen, PIPE_CAP_MAX_TEXEL_OFFSET);
 362
 363    c->MaxProgramTextureGatherComponents =
 364       screen->get_param(screen, PIPE_CAP_MAX_TEXTURE_GATHER_COMPONENTS);
 365    c->MinProgramTextureGatherOffset =
 366       screen->get_param(screen, PIPE_CAP_MIN_TEXTURE_GATHER_OFFSET);
 367    c->MaxProgramTextureGatherOffset =
 368       screen->get_param(screen, PIPE_CAP_MAX_TEXTURE_GATHER_OFFSET);
 369
 370    c->MaxTransformFeedbackBuffers =
 371       screen->get_param(screen, PIPE_CAP_MAX_STREAM_OUTPUT_BUFFERS);
 372    c->MaxTransformFeedbackBuffers = MIN2(c->MaxTransformFeedbackBuffers,
 373                                          MAX_FEEDBACK_BUFFERS);
 374    c->MaxTransformFeedbackSeparateComponents =
 375       screen->get_param(screen, PIPE_CAP_MAX_STREAM_OUTPUT_SEPARATE_COMPONENTS);
 376    c->MaxTransformFeedbackInterleavedComponents =
 377       screen->get_param(screen,
 378                         PIPE_CAP_MAX_STREAM_OUTPUT_INTERLEAVED_COMPONENTS);
 379    c->MaxVertexStreams =
 380       MAX2(1, screen->get_param(screen, PIPE_CAP_MAX_VERTEX_STREAMS));
 381
 382    /* The vertex stream must fit into pipe_stream_output_info::stream */
 383    assert(c->MaxVertexStreams <= 4);
 384
 385    c->MaxVertexAttribStride
 386       = screen->get_param(screen, PIPE_CAP_MAX_VERTEX_ATTRIB_STRIDE);
 387
 388    c->StripTextureBorder = GL_TRUE;
 389
 390    c->GLSLSkipStrictMaxUniformLimitCheck =
 391       screen->get_param(screen, PIPE_CAP_TGSI_CAN_COMPACT_CONSTANTS);
 392
 393    c->UniformBufferOffsetAlignment =
 394       screen->get_param(screen, PIPE_CAP_CONSTANT_BUFFER_OFFSET_ALIGNMENT);
 395
 396    if (can_ubo) {
 397       extensions->ARB_uniform_buffer_object = GL_TRUE;
 398       c->MaxCombinedUniformBlocks = c->MaxUniformBufferBindings =
 399          c->Program[MESA_SHADER_VERTEX].MaxUniformBlocks +
 400          c->Program[MESA_SHADER_TESS_CTRL].MaxUniformBlocks +
 401          c->Program[MESA_SHADER_TESS_EVAL].MaxUniformBlocks +
 402          c->Program[MESA_SHADER_GEOMETRY].MaxUniformBlocks +
 403          c->Program[MESA_SHADER_FRAGMENT].MaxUniformBlocks +
 404          c->Program[MESA_SHADER_COMPUTE].MaxUniformBlocks;
 405       assert(c->MaxCombinedUniformBlocks <= MAX_COMBINED_UNIFORM_BUFFERS);
 406    }
 407
 408    c->GLSLFragCoordIsSysVal =
 409       screen->get_param(screen, PIPE_CAP_TGSI_FS_POSITION_IS_SYSVAL);
 410    c->GLSLFrontFacingIsSysVal =
 411       screen->get_param(screen, PIPE_CAP_TGSI_FS_FACE_IS_INTEGER_SYSVAL);
 412
 413    c->MaxAtomicBufferBindings =
 414          c->Program[MESA_SHADER_FRAGMENT].MaxAtomicBuffers;
 415    c->MaxCombinedAtomicBuffers =
 416          c->Program[MESA_SHADER_VERTEX].MaxAtomicBuffers +
 417          c->Program[MESA_SHADER_TESS_CTRL].MaxAtomicBuffers +
 418          c->Program[MESA_SHADER_TESS_EVAL].MaxAtomicBuffers +
 419          c->Program[MESA_SHADER_GEOMETRY].MaxAtomicBuffers +
 420          c->Program[MESA_SHADER_FRAGMENT].MaxAtomicBuffers;
 421    assert(c->MaxCombinedAtomicBuffers <= MAX_COMBINED_ATOMIC_BUFFERS);
 422
 423    if (c->MaxCombinedAtomicBuffers > 0) {
 424       extensions->ARB_shader_atomic_counters = GL_TRUE;
 425       extensions->ARB_shader_atomic_counter_ops = GL_TRUE;
 426    }
 427
 428    c->MaxCombinedShaderOutputResources = c->MaxDrawBuffers;
 429    c->ShaderStorageBufferOffsetAlignment =
 430       screen->get_param(screen, PIPE_CAP_SHADER_BUFFER_OFFSET_ALIGNMENT);
 431    if (c->ShaderStorageBufferOffsetAlignment) {
 432       c->MaxCombinedShaderStorageBlocks = c->MaxShaderStorageBufferBindings =
 433          c->MaxCombinedAtomicBuffers;
 434       c->MaxCombinedShaderOutputResources +=
 435          c->MaxCombinedShaderStorageBlocks;
 436       c->MaxShaderStorageBlockSize = 1 << 27;
 437       extensions->ARB_shader_storage_buffer_object = GL_TRUE;
 438    }
 439
 440    c->MaxCombinedImageUniforms =
 441          c->Program[MESA_SHADER_VERTEX].MaxImageUniforms +
 442          c->Program[MESA_SHADER_TESS_CTRL].MaxImageUniforms +
 443          c->Program[MESA_SHADER_TESS_EVAL].MaxImageUniforms +
 444          c->Program[MESA_SHADER_GEOMETRY].MaxImageUniforms +
 445          c->Program[MESA_SHADER_FRAGMENT].MaxImageUniforms +
 446          c->Program[MESA_SHADER_COMPUTE].MaxImageUniforms;
 447    c->MaxCombinedShaderOutputResources += c->MaxCombinedImageUniforms;
 448    c->MaxImageUnits = MAX_IMAGE_UNITS;
 449    if (c->MaxCombinedImageUniforms) {
 450       extensions->ARB_shader_image_load_store = GL_TRUE;
 451       extensions->ARB_shader_image_size = GL_TRUE;
 452    }
 453
 454    /* ARB_framebuffer_no_attachments */
 455    c->MaxFramebufferWidth   = c->MaxViewportWidth;
 456    c->MaxFramebufferHeight  = c->MaxViewportHeight;
 457    /* NOTE: we cheat here a little by assuming that
 458     * PIPE_CAP_MAX_TEXTURE_ARRAY_LAYERS has the same
 459     * number of layers as we need, although we technically
 460     * could have more the generality is not really useful
 461     * in practicality.
 462     */
 463    c->MaxFramebufferLayers =
 464       screen->get_param(screen, PIPE_CAP_MAX_TEXTURE_ARRAY_LAYERS);
 465
 466    c->MaxWindowRectangles =
 467       screen->get_param(screen, PIPE_CAP_MAX_WINDOW_RECTANGLES);
 468 }
 469
 470
 471 /**
 472  * Given a member \c x of struct gl_extensions, return offset of
 473  * \c x in bytes.
 474  */
 475 #define o(x) offsetof(struct gl_extensions, x)
 476
 477
 478 struct st_extension_cap_mapping {
 479    int extension_offset;
 480    int cap;
 481 };
 482
 483 struct st_extension_format_mapping {
 484    int extension_offset[2];
 485    enum pipe_format format[32];
 486
 487    /* If TRUE, at least one format must be supported for the extensions to be
 488     * advertised. If FALSE, all the formats must be supported. */
 489    GLboolean need_at_least_one;
 490 };
 491
 492 /**
 493  * Enable extensions if certain pipe formats are supported by the driver.
 494  * What extensions will be enabled and what formats must be supported is
 495  * described by the array of st_extension_format_mapping.
 496  *
 497  * target and bind_flags are passed to is_format_supported.
 498  */
 499 static void
 500 init_format_extensions(struct pipe_screen *screen,
 501                        struct gl_extensions *extensions,
 502                        const struct st_extension_format_mapping *mapping,
 503                        unsigned num_mappings,
 504                        enum pipe_texture_target target,
 505                        unsigned bind_flags)
 506 {
 507    GLboolean *extension_table = (GLboolean *) extensions;
 508    unsigned i;
 509    int j;
 510    int num_formats = ARRAY_SIZE(mapping->format);
 511    int num_ext = ARRAY_SIZE(mapping->extension_offset);
 512
 513    for (i = 0; i < num_mappings; i++) {
 514       int num_supported = 0;
 515
 516       /* Examine each format in the list. */
 517       for (j = 0; j < num_formats && mapping[i].format[j]; j++) {
 518          if (screen->is_format_supported(screen, mapping[i].format[j],
 519                                          target, 0, bind_flags)) {
 520             num_supported++;
 521          }
 522       }
 523
 524       if (!num_supported ||
 525           (!mapping[i].need_at_least_one && num_supported != j)) {
 526          continue;
 527       }
 528
 529       /* Enable all extensions in the list. */
 530       for (j = 0; j < num_ext && mapping[i].extension_offset[j]; j++)
 531          extension_table[mapping[i].extension_offset[j]] = GL_TRUE;
 532    }
 533 }
 534
 535
 536 /**
 537  * Given a list of formats and bind flags, return the maximum number
 538  * of samples supported by any of those formats.
 539  */
 540 static unsigned
 541 get_max_samples_for_formats(struct pipe_screen *screen,
 542                             unsigned num_formats,
 543                             enum pipe_format *formats,
 544                             unsigned max_samples,
 545                             unsigned bind)
 546 {
 547    unsigned i, f;
 548
 549    for (i = max_samples; i > 0; --i) {
 550       for (f = 0; f < num_formats; f++) {
 551          if (screen->is_format_supported(screen, formats[f],
 552                                          PIPE_TEXTURE_2D, i, bind)) {
 553             return i;
 554          }
 555       }
 556    }
 557    return 0;
 558 }
 559
 560
 561 /**
 562  * Use pipe_screen::get_param() to query PIPE_CAP_ values to determine
 563  * which GL extensions are supported.
 564  * Quite a few extensions are always supported because they are standard
 565  * features or can be built on top of other gallium features.
 566  * Some fine tuning may still be needed.
 567  */
 568 void st_init_extensions(struct pipe_screen *screen,
 569                         struct gl_constants *consts,
 570                         struct gl_extensions *extensions,
 571                         struct st_config_options *options,
 572                         boolean has_lib_dxtc)
 573 {
 574    unsigned i;
 575    GLboolean *extension_table = (GLboolean *) extensions;
 576
 577    static const struct st_extension_cap_mapping cap_mapping[] = {
 578       { o(ARB_base_instance),                PIPE_CAP_START_INSTANCE                   },
 579       { o(ARB_buffer_storage),               PIPE_CAP_BUFFER_MAP_PERSISTENT_COHERENT   },
 580       { o(ARB_clear_texture),                PIPE_CAP_CLEAR_TEXTURE                    },
 581       { o(ARB_clip_control),                 PIPE_CAP_CLIP_HALFZ                       },
 582       { o(ARB_color_buffer_float),           PIPE_CAP_VERTEX_COLOR_UNCLAMPED           },
 583       { o(ARB_conditional_render_inverted),  PIPE_CAP_CONDITIONAL_RENDER_INVERTED      },
 584       { o(ARB_copy_image),                   PIPE_CAP_COPY_BETWEEN_COMPRESSED_AND_PLAIN_FORMATS },
 585       { o(OES_copy_image),                   PIPE_CAP_COPY_BETWEEN_COMPRESSED_AND_PLAIN_FORMATS },
 586       { o(ARB_cull_distance),                PIPE_CAP_CULL_DISTANCE                    },
 587       { o(ARB_depth_clamp),                  PIPE_CAP_DEPTH_CLIP_DISABLE               },
 588       { o(ARB_depth_texture),                PIPE_CAP_TEXTURE_SHADOW_MAP               },
 589       { o(ARB_derivative_control),           PIPE_CAP_TGSI_FS_FINE_DERIVATIVE          },
 590       { o(ARB_draw_buffers_blend),           PIPE_CAP_INDEP_BLEND_FUNC                 },
 591       { o(ARB_draw_indirect),                PIPE_CAP_DRAW_INDIRECT                    },
 592       { o(ARB_draw_instanced),               PIPE_CAP_TGSI_INSTANCEID                  },
 593       { o(ARB_fragment_program_shadow),      PIPE_CAP_TEXTURE_SHADOW_MAP               },
 594       { o(ARB_framebuffer_object),           PIPE_CAP_MIXED_FRAMEBUFFER_SIZES          },
 595       { o(ARB_indirect_parameters),          PIPE_CAP_MULTI_DRAW_INDIRECT_PARAMS       },
 596       { o(ARB_instanced_arrays),             PIPE_CAP_VERTEX_ELEMENT_INSTANCE_DIVISOR  },
 597       { o(ARB_occlusion_query),              PIPE_CAP_OCCLUSION_QUERY                  },
 598       { o(ARB_occlusion_query2),             PIPE_CAP_OCCLUSION_QUERY                  },
 599       { o(ARB_pipeline_statistics_query),    PIPE_CAP_QUERY_PIPELINE_STATISTICS        },
 600       { o(ARB_point_sprite),                 PIPE_CAP_POINT_SPRITE                     },
 601       { o(ARB_query_buffer_object),          PIPE_CAP_QUERY_BUFFER_OBJECT              },
 602       { o(ARB_robust_buffer_access_behavior), PIPE_CAP_ROBUST_BUFFER_ACCESS_BEHAVIOR   },
 603       { o(ARB_sample_shading),               PIPE_CAP_SAMPLE_SHADING                   },
 604       { o(ARB_seamless_cube_map),            PIPE_CAP_SEAMLESS_CUBE_MAP                },
 605       { o(ARB_shader_draw_parameters),       PIPE_CAP_DRAW_PARAMETERS                  },
 606       { o(ARB_shader_group_vote),            PIPE_CAP_TGSI_VOTE                        },
 607       { o(ARB_shader_stencil_export),        PIPE_CAP_SHADER_STENCIL_EXPORT            },
 608       { o(ARB_shader_texture_image_samples), PIPE_CAP_TGSI_TXQS                        },
 609       { o(ARB_shader_texture_lod),           PIPE_CAP_SM3                              },
 610       { o(ARB_shadow),                       PIPE_CAP_TEXTURE_SHADOW_MAP               },
 611       { o(ARB_texture_buffer_object),        PIPE_CAP_TEXTURE_BUFFER_OBJECTS           },
 612       { o(ARB_texture_cube_map_array),       PIPE_CAP_CUBE_MAP_ARRAY                   },
 613       { o(ARB_texture_gather),               PIPE_CAP_MAX_TEXTURE_GATHER_COMPONENTS    },
 614       { o(ARB_texture_mirror_clamp_to_edge), PIPE_CAP_TEXTURE_MIRROR_CLAMP             },
 615       { o(ARB_texture_multisample),          PIPE_CAP_TEXTURE_MULTISAMPLE              },
 616       { o(ARB_texture_non_power_of_two),     PIPE_CAP_NPOT_TEXTURES                    },
 617       { o(ARB_texture_query_lod),            PIPE_CAP_TEXTURE_QUERY_LOD                },
 618       { o(ARB_texture_view),                 PIPE_CAP_SAMPLER_VIEW_TARGET              },
 619       { o(ARB_timer_query),                  PIPE_CAP_QUERY_TIMESTAMP                  },
 620       { o(ARB_transform_feedback2),          PIPE_CAP_STREAM_OUTPUT_PAUSE_RESUME       },
 621       { o(ARB_transform_feedback3),          PIPE_CAP_STREAM_OUTPUT_PAUSE_RESUME       },
 622
 623       { o(EXT_blend_equation_separate),      PIPE_CAP_BLEND_EQUATION_SEPARATE          },
 624       { o(EXT_depth_bounds_test),            PIPE_CAP_DEPTH_BOUNDS_TEST                },
 625       { o(EXT_draw_buffers2),                PIPE_CAP_INDEP_BLEND_ENABLE               },
 626       { o(EXT_polygon_offset_clamp),         PIPE_CAP_POLYGON_OFFSET_CLAMP             },
 627       { o(EXT_stencil_two_side),             PIPE_CAP_TWO_SIDED_STENCIL                },
 628       { o(EXT_texture_array),                PIPE_CAP_MAX_TEXTURE_ARRAY_LAYERS         },
 629       { o(EXT_texture_filter_anisotropic),   PIPE_CAP_ANISOTROPIC_FILTER               },
 630       { o(EXT_texture_mirror_clamp),         PIPE_CAP_TEXTURE_MIRROR_CLAMP             },
 631       { o(EXT_texture_swizzle),              PIPE_CAP_TEXTURE_SWIZZLE                  },
 632       { o(EXT_transform_feedback),           PIPE_CAP_MAX_STREAM_OUTPUT_BUFFERS        },
 633       { o(EXT_window_rectangles),            PIPE_CAP_MAX_WINDOW_RECTANGLES            },
 634
 635       { o(AMD_pinned_memory),                PIPE_CAP_RESOURCE_FROM_USER_MEMORY        },
 636       { o(ATI_meminfo),                      PIPE_CAP_QUERY_MEMORY_INFO                },
 637       { o(AMD_seamless_cubemap_per_texture), PIPE_CAP_SEAMLESS_CUBE_MAP_PER_TEXTURE    },
 638       { o(ATI_separate_stencil),             PIPE_CAP_TWO_SIDED_STENCIL                },
 639       { o(ATI_texture_mirror_once),          PIPE_CAP_TEXTURE_MIRROR_CLAMP             },
 640       { o(NV_conditional_render),            PIPE_CAP_CONDITIONAL_RENDER               },
 641       { o(NV_primitive_restart),             PIPE_CAP_PRIMITIVE_RESTART                },
 642       { o(NV_texture_barrier),               PIPE_CAP_TEXTURE_BARRIER                  },
 643       { o(NVX_gpu_memory_info),              PIPE_CAP_QUERY_MEMORY_INFO                },
 644       /* GL_NV_point_sprite is not supported by gallium because we don't
 645        * support the GL_POINT_SPRITE_R_MODE_NV option. */
 646
 647       { o(OES_standard_derivatives),         PIPE_CAP_SM3                              },
 648       { o(OES_texture_float_linear),         PIPE_CAP_TEXTURE_FLOAT_LINEAR             },
 649       { o(OES_texture_half_float_linear),    PIPE_CAP_TEXTURE_HALF_FLOAT_LINEAR        },
 650    };
 651
 652    /* Required: render target and sampler support */
 653    static const struct st_extension_format_mapping rendertarget_mapping[] = {
 654       { { o(ARB_texture_float) },
 655         { PIPE_FORMAT_R32G32B32A32_FLOAT,
 656           PIPE_FORMAT_R16G16B16A16_FLOAT } },
 657
 658       { { o(OES_texture_float) },
 659         { PIPE_FORMAT_R32G32B32A32_FLOAT } },
 660
 661       { { o(OES_texture_half_float) },
 662         { PIPE_FORMAT_R16G16B16A16_FLOAT } },
 663
 664       { { o(ARB_texture_rgb10_a2ui) },
 665         { PIPE_FORMAT_R10G10B10A2_UINT,
 666           PIPE_FORMAT_B10G10R10A2_UINT },
 667          GL_TRUE }, /* at least one format must be supported */
 668
 669       { { o(EXT_framebuffer_sRGB) },
 670         { PIPE_FORMAT_A8B8G8R8_SRGB,
 671           PIPE_FORMAT_B8G8R8A8_SRGB },
 672          GL_TRUE }, /* at least one format must be supported */
 673
 674       { { o(EXT_packed_float) },
 675         { PIPE_FORMAT_R11G11B10_FLOAT } },
 676
 677       { { o(EXT_texture_integer) },
 678         { PIPE_FORMAT_R32G32B32A32_UINT,
 679           PIPE_FORMAT_R32G32B32A32_SINT } },
 680
 681       { { o(ARB_texture_rg) },
 682         { PIPE_FORMAT_R8_UNORM,
 683           PIPE_FORMAT_R8G8_UNORM } },
 684    };
 685
 686    /* Required: depth stencil and sampler support */
 687    static const struct st_extension_format_mapping depthstencil_mapping[] = {
 688       { { o(ARB_depth_buffer_float) },
 689         { PIPE_FORMAT_Z32_FLOAT,
 690           PIPE_FORMAT_Z32_FLOAT_S8X24_UINT } },
 691    };
 692
 693    /* Required: sampler support */
 694    static const struct st_extension_format_mapping texture_mapping[] = {
 695       { { o(ARB_texture_compression_rgtc) },
 696         { PIPE_FORMAT_RGTC1_UNORM,
 697           PIPE_FORMAT_RGTC1_SNORM,
 698           PIPE_FORMAT_RGTC2_UNORM,
 699           PIPE_FORMAT_RGTC2_SNORM } },
 700
 701       { { o(EXT_texture_compression_latc) },
 702         { PIPE_FORMAT_LATC1_UNORM,
 703           PIPE_FORMAT_LATC1_SNORM,
 704           PIPE_FORMAT_LATC2_UNORM,
 705           PIPE_FORMAT_LATC2_SNORM } },
 706
 707       { { o(EXT_texture_compression_s3tc),
 708           o(ANGLE_texture_compression_dxt) },
 709         { PIPE_FORMAT_DXT1_RGB,
 710           PIPE_FORMAT_DXT1_RGBA,
 711           PIPE_FORMAT_DXT3_RGBA,
 712           PIPE_FORMAT_DXT5_RGBA } },
 713
 714       { { o(ARB_texture_compression_bptc) },
 715         { PIPE_FORMAT_BPTC_RGBA_UNORM,
 716           PIPE_FORMAT_BPTC_SRGBA,
 717           PIPE_FORMAT_BPTC_RGB_FLOAT,
 718           PIPE_FORMAT_BPTC_RGB_UFLOAT } },
 719
 720       { { o(KHR_texture_compression_astc_ldr) },
 721         { PIPE_FORMAT_ASTC_4x4,
 722           PIPE_FORMAT_ASTC_5x4,
 723           PIPE_FORMAT_ASTC_5x5,
 724           PIPE_FORMAT_ASTC_6x5,
 725           PIPE_FORMAT_ASTC_6x6,
 726           PIPE_FORMAT_ASTC_8x5,
 727           PIPE_FORMAT_ASTC_8x6,
 728           PIPE_FORMAT_ASTC_8x8,
 729           PIPE_FORMAT_ASTC_10x5,
 730           PIPE_FORMAT_ASTC_10x6,
 731           PIPE_FORMAT_ASTC_10x8,
 732           PIPE_FORMAT_ASTC_10x10,
 733           PIPE_FORMAT_ASTC_12x10,
 734           PIPE_FORMAT_ASTC_12x12,
 735           PIPE_FORMAT_ASTC_4x4_SRGB,
 736           PIPE_FORMAT_ASTC_5x4_SRGB,
 737           PIPE_FORMAT_ASTC_5x5_SRGB,
 738           PIPE_FORMAT_ASTC_6x5_SRGB,
 739           PIPE_FORMAT_ASTC_6x6_SRGB,
 740           PIPE_FORMAT_ASTC_8x5_SRGB,
 741           PIPE_FORMAT_ASTC_8x6_SRGB,
 742           PIPE_FORMAT_ASTC_8x8_SRGB,
 743           PIPE_FORMAT_ASTC_10x5_SRGB,
 744           PIPE_FORMAT_ASTC_10x6_SRGB,
 745           PIPE_FORMAT_ASTC_10x8_SRGB,
 746           PIPE_FORMAT_ASTC_10x10_SRGB,
 747           PIPE_FORMAT_ASTC_12x10_SRGB,
 748           PIPE_FORMAT_ASTC_12x12_SRGB } },
 749
 750       { { o(EXT_texture_shared_exponent) },
 751         { PIPE_FORMAT_R9G9B9E5_FLOAT } },
 752
 753       { { o(EXT_texture_snorm) },
 754         { PIPE_FORMAT_R8G8B8A8_SNORM } },
 755
 756       { { o(EXT_texture_sRGB),
 757           o(EXT_texture_sRGB_decode) },
 758         { PIPE_FORMAT_A8B8G8R8_SRGB,
 759           PIPE_FORMAT_B8G8R8A8_SRGB },
 760         GL_TRUE }, /* at least one format must be supported */
 761
 762       { { o(ATI_texture_compression_3dc) },
 763         { PIPE_FORMAT_LATC2_UNORM } },
 764
 765       { { o(MESA_ycbcr_texture) },
 766         { PIPE_FORMAT_UYVY,
 767           PIPE_FORMAT_YUYV },
 768         GL_TRUE }, /* at least one format must be supported */
 769
 770       { { o(OES_compressed_ETC1_RGB8_texture) },
 771         { PIPE_FORMAT_ETC1_RGB8,
 772           PIPE_FORMAT_R8G8B8A8_UNORM },
 773         GL_TRUE }, /* at least one format must be supported */
 774
 775       { { o(ARB_stencil_texturing),
 776           o(ARB_texture_stencil8) },
 777         { PIPE_FORMAT_X24S8_UINT,
 778           PIPE_FORMAT_S8X24_UINT },
 779         GL_TRUE }, /* at least one format must be supported */
 780    };
 781
 782    /* Required: vertex fetch support. */
 783    static const struct st_extension_format_mapping vertex_mapping[] = {
 784       { { o(EXT_vertex_array_bgra) },
 785         { PIPE_FORMAT_B8G8R8A8_UNORM } },
 786       { { o(ARB_vertex_type_2_10_10_10_rev) },
 787         { PIPE_FORMAT_R10G10B10A2_UNORM,
 788           PIPE_FORMAT_B10G10R10A2_UNORM,
 789           PIPE_FORMAT_R10G10B10A2_SNORM,
 790           PIPE_FORMAT_B10G10R10A2_SNORM,
 791           PIPE_FORMAT_R10G10B10A2_USCALED,
 792           PIPE_FORMAT_B10G10R10A2_USCALED,
 793           PIPE_FORMAT_R10G10B10A2_SSCALED,
 794           PIPE_FORMAT_B10G10R10A2_SSCALED } },
 795       { { o(ARB_vertex_type_10f_11f_11f_rev) },
 796         { PIPE_FORMAT_R11G11B10_FLOAT } },
 797    };
 798
 799    static const struct st_extension_format_mapping tbo_rgb32[] = {
 800       { {o(ARB_texture_buffer_object_rgb32) },
 801         { PIPE_FORMAT_R32G32B32_FLOAT,
 802           PIPE_FORMAT_R32G32B32_UINT,
 803           PIPE_FORMAT_R32G32B32_SINT,
 804         } },
 805    };
 806
 807    /*
 808     * Extensions that are supported by all Gallium drivers:
 809     */
 810    extensions->ARB_ES2_compatibility = GL_TRUE;
 811    extensions->ARB_draw_elements_base_vertex = GL_TRUE;
 812    extensions->ARB_explicit_attrib_location = GL_TRUE;
 813    extensions->ARB_explicit_uniform_location = GL_TRUE;
 814    extensions->ARB_fragment_coord_conventions = GL_TRUE;
 815    extensions->ARB_fragment_program = GL_TRUE;
 816    extensions->ARB_fragment_shader = GL_TRUE;
 817    extensions->ARB_half_float_vertex = GL_TRUE;
 818    extensions->ARB_internalformat_query = GL_TRUE;
 819    extensions->ARB_internalformat_query2 = GL_TRUE;
 820    extensions->ARB_map_buffer_range = GL_TRUE;
 821    extensions->ARB_texture_border_clamp = GL_TRUE; /* XXX temp */
 822    extensions->ARB_texture_cube_map = GL_TRUE;
 823    extensions->ARB_texture_env_combine = GL_TRUE;
 824    extensions->ARB_texture_env_crossbar = GL_TRUE;
 825    extensions->ARB_texture_env_dot3 = GL_TRUE;
 826    extensions->ARB_vertex_program = GL_TRUE;
 827    extensions->ARB_vertex_shader = GL_TRUE;
 828
 829    extensions->EXT_blend_color = GL_TRUE;
 830    extensions->EXT_blend_func_separate = GL_TRUE;
 831    extensions->EXT_blend_minmax = GL_TRUE;
 832    extensions->EXT_gpu_program_parameters = GL_TRUE;
 833    extensions->EXT_pixel_buffer_object = GL_TRUE;
 834    extensions->EXT_point_parameters = GL_TRUE;
 835    extensions->EXT_provoking_vertex = GL_TRUE;
 836
 837    extensions->EXT_texture_env_dot3 = GL_TRUE;
 838
 839    extensions->ATI_fragment_shader = GL_TRUE;
 840    extensions->ATI_texture_env_combine3 = GL_TRUE;
 841
 842    extensions->MESA_pack_invert = GL_TRUE;
 843
 844    extensions->NV_fog_distance = GL_TRUE;
 845    extensions->NV_texture_env_combine4 = GL_TRUE;
 846    extensions->NV_texture_rectangle = GL_TRUE;
 847
 848    extensions->OES_EGL_image = GL_TRUE;
 849    extensions->OES_EGL_image_external = GL_TRUE;
 850    extensions->OES_draw_texture = GL_TRUE;
 851
 852    /* Expose the extensions which directly correspond to gallium caps. */
 853    for (i = 0; i < ARRAY_SIZE(cap_mapping); i++) {
 854       if (screen->get_param(screen, cap_mapping[i].cap)) {
 855          extension_table[cap_mapping[i].extension_offset] = GL_TRUE;
 856       }
 857    }
 858
 859    /* Expose the extensions which directly correspond to gallium formats. */
 860    init_format_extensions(screen, extensions, rendertarget_mapping,
 861                           ARRAY_SIZE(rendertarget_mapping), PIPE_TEXTURE_2D,
 862                           PIPE_BIND_RENDER_TARGET | PIPE_BIND_SAMPLER_VIEW);
 863    init_format_extensions(screen, extensions, depthstencil_mapping,
 864                           ARRAY_SIZE(depthstencil_mapping), PIPE_TEXTURE_2D,
 865                           PIPE_BIND_DEPTH_STENCIL | PIPE_BIND_SAMPLER_VIEW);
 866    init_format_extensions(screen, extensions, texture_mapping,
 867                           ARRAY_SIZE(texture_mapping), PIPE_TEXTURE_2D,
 868                           PIPE_BIND_SAMPLER_VIEW);
 869    init_format_extensions(screen, extensions, vertex_mapping,
 870                           ARRAY_SIZE(vertex_mapping), PIPE_BUFFER,
 871                           PIPE_BIND_VERTEX_BUFFER);
 872
 873    /* Figure out GLSL support and set GLSLVersion to it. */
 874    consts->GLSLVersion = screen->get_param(screen, PIPE_CAP_GLSL_FEATURE_LEVEL);
 875
 876    _mesa_override_glsl_version(consts);
 877
 878    if (options->force_glsl_version > 0 &&
 879        options->force_glsl_version <= consts->GLSLVersion) {
 880       consts->ForceGLSLVersion = options->force_glsl_version;
 881    }
 882
 883    if (consts->GLSLVersion >= 400)
 884       extensions->ARB_gpu_shader5 = GL_TRUE;
 885    if (consts->GLSLVersion >= 410)
 886       extensions->ARB_shader_precision = GL_TRUE;
 887
 888    /* This extension needs full OpenGL 3.2, but we don't know if that's
 889     * supported at this point. Only check the GLSL version. */
 890    if (consts->GLSLVersion >= 150 &&
 891        screen->get_param(screen, PIPE_CAP_TGSI_VS_LAYER_VIEWPORT)) {
 892       extensions->AMD_vertex_shader_layer = GL_TRUE;
 893    }
 894
 895    if (consts->GLSLVersion >= 130) {
 896       consts->NativeIntegers = GL_TRUE;
 897       consts->MaxClipPlanes = 8;
 898
 899       if (screen->get_param(screen, PIPE_CAP_VERTEXID_NOBASE)) {
 900          consts->VertexID_is_zero_based = GL_TRUE;
 901       }
 902
 903       /* Extensions that either depend on GLSL 1.30 or are a subset thereof. */
 904       extensions->ARB_conservative_depth = GL_TRUE;
 905       extensions->ARB_shading_language_packing = GL_TRUE;
 906       extensions->OES_depth_texture_cube_map = GL_TRUE;
 907       extensions->ARB_shading_language_420pack = GL_TRUE;
 908       extensions->ARB_texture_query_levels = GL_TRUE;
 909       extensions->ARB_shader_subroutine = GL_TRUE;
 910
 911       if (!options->disable_shader_bit_encoding) {
 912          extensions->ARB_shader_bit_encoding = GL_TRUE;
 913       }
 914
 915       extensions->EXT_shader_integer_mix = GL_TRUE;
 916       extensions->ARB_arrays_of_arrays = GL_TRUE;
 917       extensions->MESA_shader_integer_functions = GL_TRUE;
 918    } else {
 919       /* Optional integer support for GLSL 1.2. */
 920       if (screen->get_shader_param(screen, PIPE_SHADER_VERTEX,
 921                                    PIPE_SHADER_CAP_INTEGERS) &&
 922           screen->get_shader_param(screen, PIPE_SHADER_FRAGMENT,
 923                                    PIPE_SHADER_CAP_INTEGERS)) {
 924          consts->NativeIntegers = GL_TRUE;
 925
 926          extensions->EXT_shader_integer_mix = GL_TRUE;
 927       }
 928
 929       /* Integer textures make no sense before GLSL 1.30 */
 930       extensions->EXT_texture_integer = GL_FALSE;
 931    }
 932
 933    consts->GLSLZeroInit = options->glsl_zero_init;
 934
 935    consts->UniformBooleanTrue = consts->NativeIntegers ? ~0U : fui(1.0f);
 936
 937    /* Below are the cases which cannot be moved into tables easily. */
 938
 939    if (!has_lib_dxtc && !options->force_s3tc_enable) {
 940       extensions->EXT_texture_compression_s3tc = GL_FALSE;
 941       extensions->ANGLE_texture_compression_dxt = GL_FALSE;
 942    }
 943
 944    if (screen->get_shader_param(screen, PIPE_SHADER_TESS_CTRL,
 945                                 PIPE_SHADER_CAP_MAX_INSTRUCTIONS) > 0) {
 946       extensions->ARB_tessellation_shader = GL_TRUE;
 947    }
 948
 949    /* What this is really checking for is the ability to support multiple
 950     * invocations of a geometry shader. There is no separate cap for that, so
 951     * we check the GLSLVersion.
 952     */
 953    if (consts->GLSLVersion >= 400 &&
 954        screen->get_shader_param(screen, PIPE_SHADER_GEOMETRY,
 955                                 PIPE_SHADER_CAP_MAX_INSTRUCTIONS) > 0) {
 956       extensions->OES_geometry_shader = GL_TRUE;
 957    }
 958
 959    if (screen->fence_finish) {
 960       extensions->ARB_sync = GL_TRUE;
 961    }
 962
 963    /* Needs PIPE_CAP_SAMPLE_SHADING + all the sample-related bits of
 964     * ARB_gpu_shader5. This enables all the per-sample shading ES extensions.
 965     */
 966    extensions->OES_sample_variables = extensions->ARB_sample_shading &&
 967       extensions->ARB_gpu_shader5;
 968
 969    /* Maximum sample count. */
 970    {
 971       enum pipe_format color_formats[] = {
 972          PIPE_FORMAT_R8G8B8A8_UNORM,
 973          PIPE_FORMAT_B8G8R8A8_UNORM,
 974          PIPE_FORMAT_A8R8G8B8_UNORM,
 975          PIPE_FORMAT_A8B8G8R8_UNORM,
 976       };
 977       enum pipe_format depth_formats[] = {
 978          PIPE_FORMAT_Z16_UNORM,
 979          PIPE_FORMAT_Z24X8_UNORM,
 980          PIPE_FORMAT_X8Z24_UNORM,
 981          PIPE_FORMAT_Z32_UNORM,
 982          PIPE_FORMAT_Z32_FLOAT
 983       };
 984       enum pipe_format int_formats[] = {
 985          PIPE_FORMAT_R8G8B8A8_SINT
 986       };
 987       enum pipe_format void_formats[] = {
 988          PIPE_FORMAT_NONE
 989       };
 990
 991       consts->MaxSamples =
 992          get_max_samples_for_formats(screen, ARRAY_SIZE(color_formats),
 993                                      color_formats, 16,
 994                                      PIPE_BIND_RENDER_TARGET);
 995
 996       consts->MaxImageSamples =
 997          get_max_samples_for_formats(screen, ARRAY_SIZE(color_formats),
 998                                      color_formats, 16,
 999                                      PIPE_BIND_SHADER_IMAGE);
1000
1001       consts->MaxColorTextureSamples =
1002          get_max_samples_for_formats(screen, ARRAY_SIZE(color_formats),
1003                                      color_formats, consts->MaxSamples,
1004                                      PIPE_BIND_SAMPLER_VIEW);
1005
1006       consts->MaxDepthTextureSamples =
1007          get_max_samples_for_formats(screen, ARRAY_SIZE(depth_formats),
1008                                      depth_formats, consts->MaxSamples,
1009                                      PIPE_BIND_SAMPLER_VIEW);
1010
1011       consts->MaxIntegerSamples =
1012          get_max_samples_for_formats(screen, ARRAY_SIZE(int_formats),
1013                                      int_formats, consts->MaxSamples,
1014                                      PIPE_BIND_SAMPLER_VIEW);
1015
1016       /* ARB_framebuffer_no_attachments, assume max no. of samples 32 */
1017       consts->MaxFramebufferSamples =
1018          get_max_samples_for_formats(screen, ARRAY_SIZE(void_formats),
1019                                      void_formats, 32,
1020                                      PIPE_BIND_RENDER_TARGET);
1021    }
1022    if (consts->MaxSamples == 1) {
1023       /* one sample doesn't really make sense */
1024       consts->MaxSamples = 0;
1025    }
1026    else if (consts->MaxSamples >= 2) {
1027       extensions->EXT_framebuffer_multisample = GL_TRUE;
1028       extensions->EXT_framebuffer_multisample_blit_scaled = GL_TRUE;
1029    }
1030
1031    if (consts->MaxSamples == 0 && screen->get_param(screen, PIPE_CAP_FAKE_SW_MSAA)) {
1032         consts->FakeSWMSAA = GL_TRUE;
1033         extensions->EXT_framebuffer_multisample = GL_TRUE;
1034         extensions->EXT_framebuffer_multisample_blit_scaled = GL_TRUE;
1035         extensions->ARB_texture_multisample = GL_TRUE;
1036    }
1037
1038    if (consts->MaxDualSourceDrawBuffers > 0 &&
1039        !options->disable_blend_func_extended)
1040       extensions->ARB_blend_func_extended = GL_TRUE;
1041
1042    if (screen->get_param(screen, PIPE_CAP_QUERY_TIME_ELAPSED) ||
1043        extensions->ARB_timer_query) {
1044       extensions->EXT_timer_query = GL_TRUE;
1045    }
1046
1047    if (extensions->ARB_transform_feedback2 &&
1048        extensions->ARB_draw_instanced) {
1049       extensions->ARB_transform_feedback_instanced = GL_TRUE;
1050    }
1051    if (options->force_glsl_extensions_warn)
1052       consts->ForceGLSLExtensionsWarn = 1;
1053
1054    if (options->disable_glsl_line_continuations)
1055       consts->DisableGLSLLineContinuations = 1;
1056
1057    if (options->allow_glsl_extension_directive_midshader)
1058       consts->AllowGLSLExtensionDirectiveMidShader = GL_TRUE;
1059
1060    consts->MinMapBufferAlignment =
1061       screen->get_param(screen, PIPE_CAP_MIN_MAP_BUFFER_ALIGNMENT);
1062
1063    if (extensions->ARB_texture_buffer_object) {
1064       consts->MaxTextureBufferSize =
1065          _min(screen->get_param(screen, PIPE_CAP_MAX_TEXTURE_BUFFER_SIZE),
1066               (1u << 31) - 1);
1067       consts->TextureBufferOffsetAlignment =
1068          screen->get_param(screen, PIPE_CAP_TEXTURE_BUFFER_OFFSET_ALIGNMENT);
1069
1070       if (consts->TextureBufferOffsetAlignment)
1071          extensions->ARB_texture_buffer_range = GL_TRUE;
1072
1073       init_format_extensions(screen, extensions, tbo_rgb32,
1074                              ARRAY_SIZE(tbo_rgb32), PIPE_BUFFER,
1075                              PIPE_BIND_SAMPLER_VIEW);
1076    }
1077
1078    extensions->OES_texture_buffer =
1079       extensions->ARB_texture_buffer_object &&
1080       extensions->ARB_texture_buffer_range &&
1081       extensions->ARB_texture_buffer_object_rgb32 &&
1082       extensions->ARB_shader_image_load_store;
1083
1084    /* Unpacking a varying in the fragment shader costs 1 texture indirection.
1085     * If the number of available texture indirections is very limited, then we
1086     * prefer to disable varying packing rather than run the risk of varying
1087     * packing preventing a shader from running.
1088     */
1089    if (screen->get_shader_param(screen, PIPE_SHADER_FRAGMENT,
1090                                 PIPE_SHADER_CAP_MAX_TEX_INDIRECTIONS) <= 8) {
1091       /* We can't disable varying packing if transform feedback is available,
1092        * because transform feedback code assumes a packed varying layout.
1093        */
1094       if (!extensions->EXT_transform_feedback)
1095          consts->DisableVaryingPacking = GL_TRUE;
1096    }
1097
1098    consts->MaxViewports = screen->get_param(screen, PIPE_CAP_MAX_VIEWPORTS);
1099    if (consts->MaxViewports >= 16) {
1100       if (consts->GLSLVersion >= 400) {
1101          consts->ViewportBounds.Min = -32768.0;
1102          consts->ViewportBounds.Max = 32767.0;
1103       } else {
1104          consts->ViewportBounds.Min = -16384.0;
1105          consts->ViewportBounds.Max = 16383.0;
1106       }
1107       extensions->ARB_viewport_array = GL_TRUE;
1108       extensions->ARB_fragment_layer_viewport = GL_TRUE;
1109       if (extensions->AMD_vertex_shader_layer)
1110          extensions->AMD_vertex_shader_viewport_index = GL_TRUE;
1111    }
1112
1113    /* ARB_framebuffer_no_attachments */
1114    if (screen->get_param(screen, PIPE_CAP_FRAMEBUFFER_NO_ATTACHMENT) &&
1115        ((consts->MaxSamples >= 4 && consts->MaxFramebufferLayers >= 2048) ||
1116         (consts->MaxFramebufferSamples >= consts->MaxSamples &&
1117          consts->MaxFramebufferLayers >= consts->MaxArrayTextureLayers)))
1118       extensions->ARB_framebuffer_no_attachments = GL_TRUE;
1119
1120    /* GL_ARB_ES3_compatibility.
1121     *
1122     * Assume that ES3 is supported if GLSL 3.30 is supported.
1123     * (OpenGL 3.3 is a requirement for that extension.)
1124     */
1125    if (consts->GLSLVersion >= 330 &&
1126        /* Requirements for ETC2 emulation. */
1127        screen->is_format_supported(screen, PIPE_FORMAT_R8G8B8A8_UNORM,
1128                                    PIPE_TEXTURE_2D, 0,
1129                                    PIPE_BIND_SAMPLER_VIEW) &&
1130        screen->is_format_supported(screen, PIPE_FORMAT_B8G8R8A8_SRGB,
1131                                    PIPE_TEXTURE_2D, 0,
1132                                    PIPE_BIND_SAMPLER_VIEW) &&
1133        screen->is_format_supported(screen, PIPE_FORMAT_R16_UNORM,
1134                                    PIPE_TEXTURE_2D, 0,
1135                                    PIPE_BIND_SAMPLER_VIEW) &&
1136        screen->is_format_supported(screen, PIPE_FORMAT_R16G16_UNORM,
1137                                    PIPE_TEXTURE_2D, 0,
1138                                    PIPE_BIND_SAMPLER_VIEW) &&
1139        screen->is_format_supported(screen, PIPE_FORMAT_R16_SNORM,
1140                                    PIPE_TEXTURE_2D, 0,
1141                                    PIPE_BIND_SAMPLER_VIEW) &&
1142        screen->is_format_supported(screen, PIPE_FORMAT_R16G16_SNORM,
1143                                    PIPE_TEXTURE_2D, 0,
1144                                    PIPE_BIND_SAMPLER_VIEW)) {
1145       extensions->ARB_ES3_compatibility = GL_TRUE;
1146    }
1147
1148 #ifdef HAVE_ST_VDPAU
1149    if (screen->get_video_param &&
1150        screen->get_video_param(screen, PIPE_VIDEO_PROFILE_UNKNOWN,
1151                                PIPE_VIDEO_ENTRYPOINT_BITSTREAM,
1152                                PIPE_VIDEO_CAP_SUPPORTS_INTERLACED)) {
1153       extensions->NV_vdpau_interop = GL_TRUE;
1154    }
1155 #endif
1156
1157    if (screen->get_shader_param(screen, PIPE_SHADER_VERTEX,
1158                                 PIPE_SHADER_CAP_DOUBLES) &&
1159        screen->get_shader_param(screen, PIPE_SHADER_FRAGMENT,
1160                                 PIPE_SHADER_CAP_DOUBLES)) {
1161       extensions->ARB_gpu_shader_fp64 = GL_TRUE;
1162       extensions->ARB_vertex_attrib_64bit = GL_TRUE;
1163    }
1164
1165    if ((ST_DEBUG & DEBUG_GREMEDY) &&
1166        screen->get_param(screen, PIPE_CAP_STRING_MARKER))
1167       extensions->GREMEDY_string_marker = GL_TRUE;
1168
1169    if (screen->get_param(screen, PIPE_CAP_COMPUTE)) {
1170       int compute_supported_irs =
1171          screen->get_shader_param(screen, PIPE_SHADER_COMPUTE,
1172                                   PIPE_SHADER_CAP_SUPPORTED_IRS);
1173       if (compute_supported_irs & (1 << PIPE_SHADER_IR_TGSI)) {
1174          uint64_t grid_size[3], block_size[3];
1175          uint64_t max_local_size, max_threads_per_block;
1176
1177          screen->get_compute_param(screen, PIPE_SHADER_IR_TGSI,
1178                                    PIPE_COMPUTE_CAP_MAX_GRID_SIZE, grid_size);
1179          screen->get_compute_param(screen, PIPE_SHADER_IR_TGSI,
1180                                    PIPE_COMPUTE_CAP_MAX_BLOCK_SIZE, block_size);
1181          screen->get_compute_param(screen, PIPE_SHADER_IR_TGSI,
1182                                    PIPE_COMPUTE_CAP_MAX_THREADS_PER_BLOCK,
1183                                    &max_threads_per_block);
1184          screen->get_compute_param(screen, PIPE_SHADER_IR_TGSI,
1185                                    PIPE_COMPUTE_CAP_MAX_LOCAL_SIZE,
1186                                    &max_local_size);
1187
1188          consts->MaxComputeWorkGroupInvocations = max_threads_per_block;
1189          consts->MaxComputeSharedMemorySize = max_local_size;
1190
1191          for (i = 0; i < 3; i++) {
1192             consts->MaxComputeWorkGroupCount[i] = grid_size[i];
1193             consts->MaxComputeWorkGroupSize[i] = block_size[i];
1194          }
1195
1196          extensions->ARB_compute_shader =
1197                                       extensions->ARB_shader_image_load_store &&
1198                                       extensions->ARB_shader_atomic_counters;
1199       }
1200    }
1201
1202    extensions->KHR_robustness = extensions->ARB_robust_buffer_access_behavior;
1203
1204    /* If we support ES 3.1, we support the ES3_1_compatibility ext. However
1205     * there's no clean way of telling whether we would support ES 3.1 from
1206     * here, so copy the condition from compute_version_es2 here. A lot of
1207     * these are redunant, but simpler to just have a (near-)exact copy here.
1208     */
1209    extensions->ARB_ES3_1_compatibility =
1210       extensions->ARB_ES3_compatibility &&
1211       extensions->ARB_arrays_of_arrays &&
1212       extensions->ARB_compute_shader &&
1213       extensions->ARB_draw_indirect &&
1214       extensions->ARB_explicit_uniform_location &&
1215       extensions->ARB_framebuffer_no_attachments &&
1216       extensions->ARB_shader_atomic_counters &&
1217       extensions->ARB_shader_image_load_store &&
1218       extensions->ARB_shader_image_size &&
1219       extensions->ARB_shader_storage_buffer_object &&
1220       extensions->ARB_shading_language_packing &&
1221       extensions->ARB_stencil_texturing &&
1222       extensions->ARB_texture_multisample &&
1223       extensions->ARB_gpu_shader5 &&
1224       extensions->EXT_shader_integer_mix;
1225
1226    extensions->OES_texture_cube_map_array =
1227       extensions->ARB_ES3_1_compatibility &&
1228       extensions->OES_geometry_shader &&
1229       extensions->ARB_texture_cube_map_array;
1230
1231    extensions->OES_viewport_array =
1232       extensions->ARB_ES3_1_compatibility &&
1233       extensions->OES_geometry_shader &&
1234       extensions->ARB_viewport_array;
1235
1236    extensions->OES_primitive_bounding_box = extensions->ARB_ES3_1_compatibility;
1237    consts->NoPrimitiveBoundingBoxOutput = true;
1238
1239    extensions->ANDROID_extension_pack_es31a =
1240       extensions->KHR_texture_compression_astc_ldr &&
1241       extensions->KHR_blend_equation_advanced &&
1242       extensions->OES_sample_variables &&
1243       extensions->ARB_shader_image_load_store &&
1244       extensions->ARB_texture_stencil8 &&
1245       extensions->ARB_texture_multisample &&
1246       extensions->OES_copy_image &&
1247       extensions->ARB_draw_buffers_blend &&
1248       extensions->OES_geometry_shader &&
1249       extensions->ARB_gpu_shader5 &&
1250       extensions->OES_primitive_bounding_box &&
1251       extensions->ARB_tessellation_shader &&
1252       extensions->ARB_texture_border_clamp &&
1253       extensions->OES_texture_buffer &&
1254       extensions->OES_texture_cube_map_array &&
1255       extensions->EXT_texture_sRGB_decode;
1256
1257    /* Same deal as for ARB_ES3_1_compatibility - this has to be computed
1258     * before overall versions are selected. Also it's actually a subset of ES
1259     * 3.2, since it doesn't require ASTC or advanced blending.
1260     */
1261    extensions->ARB_ES3_2_compatibility =
1262       extensions->ARB_ES3_1_compatibility &&
1263       extensions->KHR_robustness &&
1264       extensions->ARB_copy_image &&
1265       extensions->ARB_draw_buffers_blend &&
1266       extensions->ARB_draw_elements_base_vertex &&
1267       extensions->OES_geometry_shader &&
1268       extensions->ARB_gpu_shader5 &&
1269       extensions->ARB_sample_shading &&
1270       extensions->ARB_tessellation_shader &&
1271       extensions->ARB_texture_border_clamp &&
1272       extensions->OES_texture_buffer &&
1273       extensions->ARB_texture_cube_map_array &&
1274       extensions->ARB_texture_stencil8 &&
1275       extensions->ARB_texture_multisample;
1276 }