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 "compiler/nir/nir.h"
  30
  31 #include "main/imports.h"
  32 #include "main/context.h"
  33 #include "main/macros.h"
  34 #include "main/version.h"
  35
  36 #include "pipe/p_context.h"
  37 #include "pipe/p_defines.h"
  38 #include "pipe/p_screen.h"
  39 #include "tgsi/tgsi_from_mesa.h"
  40 #include "util/u_math.h"
  41
  42 #include "st_context.h"
  43 #include "st_debug.h"
  44 #include "st_extensions.h"
  45 #include "st_format.h"
  46
  47
  48 /*
  49  * Note: we use these function rather than the MIN2, MAX2, CLAMP macros to
  50  * avoid evaluating arguments (which are often function calls) more than once.
  51  */
  52
  53 static unsigned _min(unsigned a, unsigned b)
  54 {
  55    return (a < b) ? a : b;
  56 }
  57
  58 static float _maxf(float a, float b)
  59 {
  60    return (a > b) ? a : b;
  61 }
  62
  63 static int _clamp(int a, int min, int max)
  64 {
  65    if (a < min)
  66       return min;
  67    else if (a > max)
  68       return max;
  69    else
  70       return a;
  71 }
  72
  73
  74 /**
  75  * Query driver to get implementation limits.
  76  * Note that we have to limit/clamp against Mesa's internal limits too.
  77  */
  78 void st_init_limits(struct pipe_screen *screen,
  79                     struct gl_constants *c, struct gl_extensions *extensions,
  80                     gl_api api)
  81 {
  82    int supported_irs;
  83    unsigned sh;
  84    boolean can_ubo = TRUE;
  85    int temp;
  86    bool ssbo_atomic = true;
  87
  88    c->MaxTextureLevels
  89       = _min(screen->get_param(screen, PIPE_CAP_MAX_TEXTURE_2D_LEVELS),
  90             MAX_TEXTURE_LEVELS);
  91
  92    c->Max3DTextureLevels
  93       = _min(screen->get_param(screen, PIPE_CAP_MAX_TEXTURE_3D_LEVELS),
  94             MAX_3D_TEXTURE_LEVELS);
  95
  96    c->MaxCubeTextureLevels
  97       = _min(screen->get_param(screen, PIPE_CAP_MAX_TEXTURE_CUBE_LEVELS),
  98             MAX_CUBE_TEXTURE_LEVELS);
  99
 100    c->MaxTextureRectSize
 101       = _min(1 << (c->MaxTextureLevels - 1), MAX_TEXTURE_RECT_SIZE);
 102
 103    c->MaxArrayTextureLayers
 104       = screen->get_param(screen, PIPE_CAP_MAX_TEXTURE_ARRAY_LAYERS);
 105
 106    /* Define max viewport size and max renderbuffer size in terms of
 107     * max texture size (note: max tex RECT size = max tex 2D size).
 108     * If this isn't true for some hardware we'll need new PIPE_CAP_ queries.
 109     */
 110    c->MaxViewportWidth =
 111    c->MaxViewportHeight =
 112    c->MaxRenderbufferSize = c->MaxTextureRectSize;
 113
 114    c->SubPixelBits =
 115    c->ViewportSubpixelBits =
 116       screen->get_param(screen, PIPE_CAP_VIEWPORT_SUBPIXEL_BITS);
 117
 118    c->MaxDrawBuffers = c->MaxColorAttachments =
 119       _clamp(screen->get_param(screen, PIPE_CAP_MAX_RENDER_TARGETS),
 120              1, MAX_DRAW_BUFFERS);
 121
 122    c->MaxDualSourceDrawBuffers =
 123       _clamp(screen->get_param(screen,
 124                                PIPE_CAP_MAX_DUAL_SOURCE_RENDER_TARGETS),
 125              0, MAX_DRAW_BUFFERS);
 126
 127    c->MaxLineWidth =
 128       _maxf(1.0f, screen->get_paramf(screen, PIPE_CAPF_MAX_LINE_WIDTH));
 129    c->MaxLineWidthAA =
 130       _maxf(1.0f, screen->get_paramf(screen, PIPE_CAPF_MAX_LINE_WIDTH_AA));
 131
 132    c->MaxPointSize =
 133       _maxf(1.0f, screen->get_paramf(screen, PIPE_CAPF_MAX_POINT_WIDTH));
 134    c->MaxPointSizeAA =
 135       _maxf(1.0f, screen->get_paramf(screen, PIPE_CAPF_MAX_POINT_WIDTH_AA));
 136
 137    /* these are not queryable. Note that GL basically mandates a 1.0 minimum
 138     * for non-aa sizes, but we can go down to 0.0 for aa points.
 139     */
 140    c->MinPointSize = 1.0f;
 141    c->MinPointSizeAA = 0.0f;
 142
 143    c->MaxTextureMaxAnisotropy =
 144       _maxf(2.0f,
 145             screen->get_paramf(screen, PIPE_CAPF_MAX_TEXTURE_ANISOTROPY));
 146
 147    c->MaxTextureLodBias =
 148       screen->get_paramf(screen, PIPE_CAPF_MAX_TEXTURE_LOD_BIAS);
 149
 150    c->QuadsFollowProvokingVertexConvention =
 151       screen->get_param(screen,
 152                         PIPE_CAP_QUADS_FOLLOW_PROVOKING_VERTEX_CONVENTION);
 153
 154    c->MaxUniformBlockSize =
 155       screen->get_shader_param(screen, PIPE_SHADER_FRAGMENT,
 156                                PIPE_SHADER_CAP_MAX_CONST_BUFFER_SIZE);
 157    /* GL45-CTS.enhanced_layouts.ssb_member_invalid_offset_alignment fails if
 158     * this is larger than INT_MAX - 100. Use a nicely aligned limit.
 159     */
 160    c->MaxUniformBlockSize = MIN2(c->MaxUniformBlockSize, INT_MAX - 127);
 161
 162    if (c->MaxUniformBlockSize < 16384) {
 163       can_ubo = FALSE;
 164    }
 165
 166    for (sh = 0; sh < PIPE_SHADER_TYPES; ++sh) {
 167       struct gl_shader_compiler_options *options;
 168       struct gl_program_constants *pc;
 169       const nir_shader_compiler_options *nir_options = NULL;
 170
 171       if (screen->get_compiler_options) {
 172          nir_options = (const nir_shader_compiler_options *)
 173             screen->get_compiler_options(screen, PIPE_SHADER_IR_NIR, sh);
 174       }
 175
 176       const gl_shader_stage stage = tgsi_processor_to_shader_stage(sh);
 177       pc = &c->Program[stage];
 178       options = &c->ShaderCompilerOptions[stage];
 179       c->ShaderCompilerOptions[stage].NirOptions = nir_options;
 180
 181       if (sh == PIPE_SHADER_COMPUTE) {
 182          if (!screen->get_param(screen, PIPE_CAP_COMPUTE))
 183             continue;
 184          supported_irs =
 185             screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_SUPPORTED_IRS);
 186          if (!(supported_irs & (1 << PIPE_SHADER_IR_TGSI)))
 187             continue;
 188       }
 189
 190       pc->MaxTextureImageUnits =
 191          _min(screen->get_shader_param(screen, sh,
 192                                        PIPE_SHADER_CAP_MAX_TEXTURE_SAMPLERS),
 193               MAX_TEXTURE_IMAGE_UNITS);
 194
 195       pc->MaxInstructions =
 196       pc->MaxNativeInstructions =
 197          screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_INSTRUCTIONS);
 198       pc->MaxAluInstructions =
 199       pc->MaxNativeAluInstructions =
 200          screen->get_shader_param(screen, sh,
 201                                   PIPE_SHADER_CAP_MAX_ALU_INSTRUCTIONS);
 202       pc->MaxTexInstructions =
 203       pc->MaxNativeTexInstructions =
 204          screen->get_shader_param(screen, sh,
 205                                   PIPE_SHADER_CAP_MAX_TEX_INSTRUCTIONS);
 206       pc->MaxTexIndirections =
 207       pc->MaxNativeTexIndirections =
 208          screen->get_shader_param(screen, sh,
 209                                   PIPE_SHADER_CAP_MAX_TEX_INDIRECTIONS);
 210       pc->MaxAttribs =
 211       pc->MaxNativeAttribs =
 212          screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_INPUTS);
 213       pc->MaxTemps =
 214       pc->MaxNativeTemps =
 215          screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_TEMPS);
 216       pc->MaxAddressRegs =
 217       pc->MaxNativeAddressRegs = sh == PIPE_SHADER_VERTEX ? 1 : 0;
 218
 219       pc->MaxUniformComponents =
 220          screen->get_shader_param(screen, sh,
 221                                   PIPE_SHADER_CAP_MAX_CONST_BUFFER_SIZE) / 4;
 222       pc->MaxUniformComponents = MIN2(pc->MaxUniformComponents,
 223                                       MAX_UNIFORMS * 4);
 224
 225       pc->MaxParameters =
 226       pc->MaxNativeParameters = pc->MaxUniformComponents / 4;
 227       pc->MaxInputComponents =
 228          screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_INPUTS) * 4;
 229       pc->MaxOutputComponents =
 230          screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_OUTPUTS) * 4;
 231
 232
 233       pc->MaxUniformBlocks =
 234          screen->get_shader_param(screen, sh,
 235                                   PIPE_SHADER_CAP_MAX_CONST_BUFFERS);
 236       if (pc->MaxUniformBlocks)
 237          pc->MaxUniformBlocks -= 1; /* The first one is for ordinary uniforms. */
 238       pc->MaxUniformBlocks = _min(pc->MaxUniformBlocks, MAX_UNIFORM_BUFFERS);
 239
 240       pc->MaxCombinedUniformComponents =
 241          pc->MaxUniformComponents +
 242          (uint64_t)c->MaxUniformBlockSize / 4 * pc->MaxUniformBlocks;
 243
 244       temp = screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_HW_ATOMIC_COUNTERS);
 245       if (temp) {
 246          /*
 247           * for separate atomic counters get the actual hw limits
 248           * per stage on atomic counters and buffers
 249           */
 250          ssbo_atomic = false;
 251          pc->MaxAtomicCounters = temp;
 252          pc->MaxAtomicBuffers = screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_HW_ATOMIC_COUNTER_BUFFERS);
 253          pc->MaxShaderStorageBlocks = screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_SHADER_BUFFERS);
 254       } else {
 255          pc->MaxAtomicCounters = MAX_ATOMIC_COUNTERS;
 256          pc->MaxAtomicBuffers = screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_SHADER_BUFFERS) / 2;
 257          pc->MaxShaderStorageBlocks = pc->MaxAtomicBuffers;
 258       }
 259       pc->MaxImageUniforms = screen->get_shader_param(
 260             screen, sh, PIPE_SHADER_CAP_MAX_SHADER_IMAGES);
 261
 262       /* Gallium doesn't really care about local vs. env parameters so use the
 263        * same limits.
 264        */
 265       pc->MaxLocalParams = MIN2(pc->MaxParameters, MAX_PROGRAM_LOCAL_PARAMS);
 266       pc->MaxEnvParams = MIN2(pc->MaxParameters, MAX_PROGRAM_ENV_PARAMS);
 267
 268       if (screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_INTEGERS)) {
 269          pc->LowInt.RangeMin = 31;
 270          pc->LowInt.RangeMax = 30;
 271          pc->LowInt.Precision = 0;
 272          pc->MediumInt = pc->HighInt = pc->LowInt;
 273       }
 274
 275       /* TODO: make these more fine-grained if anyone needs it */
 276       options->MaxIfDepth =
 277          screen->get_shader_param(screen, sh,
 278                                   PIPE_SHADER_CAP_MAX_CONTROL_FLOW_DEPTH);
 279       options->EmitNoLoops =
 280          !screen->get_shader_param(screen, sh,
 281                                    PIPE_SHADER_CAP_MAX_CONTROL_FLOW_DEPTH);
 282       options->EmitNoMainReturn =
 283          !screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_SUBROUTINES);
 284
 285       options->EmitNoCont =
 286          !screen->get_shader_param(screen, sh,
 287                                    PIPE_SHADER_CAP_TGSI_CONT_SUPPORTED);
 288
 289       options->EmitNoIndirectInput =
 290          !screen->get_shader_param(screen, sh,
 291                                    PIPE_SHADER_CAP_INDIRECT_INPUT_ADDR);
 292       options->EmitNoIndirectOutput =
 293          !screen->get_shader_param(screen, sh,
 294                                    PIPE_SHADER_CAP_INDIRECT_OUTPUT_ADDR);
 295       options->EmitNoIndirectTemp =
 296          !screen->get_shader_param(screen, sh,
 297                                    PIPE_SHADER_CAP_INDIRECT_TEMP_ADDR);
 298       options->EmitNoIndirectUniform =
 299          !screen->get_shader_param(screen, sh,
 300                                    PIPE_SHADER_CAP_INDIRECT_CONST_ADDR);
 301
 302       if (pc->MaxNativeInstructions &&
 303           (options->EmitNoIndirectUniform || pc->MaxUniformBlocks < 12)) {
 304          can_ubo = FALSE;
 305       }
 306
 307       if (options->EmitNoLoops)
 308          options->MaxUnrollIterations =
 309             MIN2(screen->get_shader_param(screen, sh,
 310                                           PIPE_SHADER_CAP_MAX_INSTRUCTIONS),
 311                  65536);
 312       else
 313          options->MaxUnrollIterations =
 314             screen->get_shader_param(screen, sh,
 315                                   PIPE_SHADER_CAP_MAX_UNROLL_ITERATIONS_HINT);
 316
 317       options->LowerCombinedClipCullDistance = true;
 318       options->LowerBufferInterfaceBlocks = true;
 319    }
 320
 321    c->MaxUserAssignableUniformLocations =
 322       c->Program[MESA_SHADER_VERTEX].MaxUniformComponents +
 323       c->Program[MESA_SHADER_TESS_CTRL].MaxUniformComponents +
 324       c->Program[MESA_SHADER_TESS_EVAL].MaxUniformComponents +
 325       c->Program[MESA_SHADER_GEOMETRY].MaxUniformComponents +
 326       c->Program[MESA_SHADER_FRAGMENT].MaxUniformComponents;
 327
 328    c->GLSLOptimizeConservatively =
 329       screen->get_param(screen, PIPE_CAP_GLSL_OPTIMIZE_CONSERVATIVELY);
 330    c->LowerTessLevel = true;
 331    c->LowerCsDerivedVariables = true;
 332    c->PrimitiveRestartForPatches =
 333       screen->get_param(screen, PIPE_CAP_PRIMITIVE_RESTART_FOR_PATCHES);
 334
 335    c->MaxCombinedTextureImageUnits =
 336          _min(c->Program[MESA_SHADER_VERTEX].MaxTextureImageUnits +
 337               c->Program[MESA_SHADER_TESS_CTRL].MaxTextureImageUnits +
 338               c->Program[MESA_SHADER_TESS_EVAL].MaxTextureImageUnits +
 339               c->Program[MESA_SHADER_GEOMETRY].MaxTextureImageUnits +
 340               c->Program[MESA_SHADER_FRAGMENT].MaxTextureImageUnits,
 341               MAX_COMBINED_TEXTURE_IMAGE_UNITS);
 342
 343    /* This depends on program constants. */
 344    c->MaxTextureCoordUnits
 345       = _min(c->Program[MESA_SHADER_FRAGMENT].MaxTextureImageUnits,
 346              MAX_TEXTURE_COORD_UNITS);
 347
 348    c->MaxTextureUnits =
 349       _min(c->Program[MESA_SHADER_FRAGMENT].MaxTextureImageUnits,
 350            c->MaxTextureCoordUnits);
 351
 352    c->Program[MESA_SHADER_VERTEX].MaxAttribs =
 353       MIN2(c->Program[MESA_SHADER_VERTEX].MaxAttribs, 16);
 354
 355    /* PIPE_SHADER_CAP_MAX_INPUTS for the FS specifies the maximum number
 356     * of inputs. It's always 2 colors + N generic inputs. */
 357    c->MaxVarying = screen->get_shader_param(screen, PIPE_SHADER_FRAGMENT,
 358                                             PIPE_SHADER_CAP_MAX_INPUTS);
 359    c->MaxVarying = MIN2(c->MaxVarying, MAX_VARYING);
 360    c->MaxGeometryOutputVertices =
 361       screen->get_param(screen, PIPE_CAP_MAX_GEOMETRY_OUTPUT_VERTICES);
 362    c->MaxGeometryTotalOutputComponents =
 363       screen->get_param(screen, PIPE_CAP_MAX_GEOMETRY_TOTAL_OUTPUT_COMPONENTS);
 364    c->MaxGeometryShaderInvocations =
 365       screen->get_param(screen, PIPE_CAP_MAX_GS_INVOCATIONS);
 366    c->MaxTessPatchComponents =
 367       MIN2(screen->get_param(screen, PIPE_CAP_MAX_SHADER_PATCH_VARYINGS),
 368            MAX_VARYING) * 4;
 369
 370    c->MinProgramTexelOffset =
 371       screen->get_param(screen, PIPE_CAP_MIN_TEXEL_OFFSET);
 372    c->MaxProgramTexelOffset =
 373       screen->get_param(screen, PIPE_CAP_MAX_TEXEL_OFFSET);
 374
 375    c->MaxProgramTextureGatherComponents =
 376       screen->get_param(screen, PIPE_CAP_MAX_TEXTURE_GATHER_COMPONENTS);
 377    c->MinProgramTextureGatherOffset =
 378       screen->get_param(screen, PIPE_CAP_MIN_TEXTURE_GATHER_OFFSET);
 379    c->MaxProgramTextureGatherOffset =
 380       screen->get_param(screen, PIPE_CAP_MAX_TEXTURE_GATHER_OFFSET);
 381
 382    c->MaxTransformFeedbackBuffers =
 383       screen->get_param(screen, PIPE_CAP_MAX_STREAM_OUTPUT_BUFFERS);
 384    c->MaxTransformFeedbackBuffers = MIN2(c->MaxTransformFeedbackBuffers,
 385                                          MAX_FEEDBACK_BUFFERS);
 386    c->MaxTransformFeedbackSeparateComponents =
 387       screen->get_param(screen, PIPE_CAP_MAX_STREAM_OUTPUT_SEPARATE_COMPONENTS);
 388    c->MaxTransformFeedbackInterleavedComponents =
 389       screen->get_param(screen,
 390                         PIPE_CAP_MAX_STREAM_OUTPUT_INTERLEAVED_COMPONENTS);
 391    c->MaxVertexStreams =
 392       MAX2(1, screen->get_param(screen, PIPE_CAP_MAX_VERTEX_STREAMS));
 393
 394    /* The vertex stream must fit into pipe_stream_output_info::stream */
 395    assert(c->MaxVertexStreams <= 4);
 396
 397    c->MaxVertexAttribStride
 398       = screen->get_param(screen, PIPE_CAP_MAX_VERTEX_ATTRIB_STRIDE);
 399
 400    c->StripTextureBorder = GL_TRUE;
 401
 402    c->GLSLSkipStrictMaxUniformLimitCheck =
 403       screen->get_param(screen, PIPE_CAP_TGSI_CAN_COMPACT_CONSTANTS);
 404
 405    c->UniformBufferOffsetAlignment =
 406       screen->get_param(screen, PIPE_CAP_CONSTANT_BUFFER_OFFSET_ALIGNMENT);
 407
 408    if (can_ubo) {
 409       extensions->ARB_uniform_buffer_object = GL_TRUE;
 410       c->MaxCombinedUniformBlocks = c->MaxUniformBufferBindings =
 411          c->Program[MESA_SHADER_VERTEX].MaxUniformBlocks +
 412          c->Program[MESA_SHADER_TESS_CTRL].MaxUniformBlocks +
 413          c->Program[MESA_SHADER_TESS_EVAL].MaxUniformBlocks +
 414          c->Program[MESA_SHADER_GEOMETRY].MaxUniformBlocks +
 415          c->Program[MESA_SHADER_FRAGMENT].MaxUniformBlocks,
 416       assert(c->MaxCombinedUniformBlocks <= MAX_COMBINED_UNIFORM_BUFFERS);
 417    }
 418
 419    c->GLSLFragCoordIsSysVal =
 420       screen->get_param(screen, PIPE_CAP_TGSI_FS_POSITION_IS_SYSVAL);
 421    c->GLSLFrontFacingIsSysVal =
 422       screen->get_param(screen, PIPE_CAP_TGSI_FS_FACE_IS_INTEGER_SYSVAL);
 423
 424    /* GL_ARB_get_program_binary
 425     *
 426     * The QT framework has a bug in their shader program cache, which is built
 427     * on GL_ARB_get_program_binary. In an effort to allow them to fix the bug
 428     * we don't enable more than 1 binary format for compatibility profiles.
 429     */
 430    if (api != API_OPENGL_COMPAT &&
 431        screen->get_disk_shader_cache && screen->get_disk_shader_cache(screen))
 432       c->NumProgramBinaryFormats = 1;
 433
 434    c->MaxAtomicBufferBindings =
 435           c->Program[MESA_SHADER_FRAGMENT].MaxAtomicBuffers;
 436
 437    if (!ssbo_atomic) {
 438       /* for separate atomic buffers - there atomic buffer size will be
 439          limited */
 440       c->MaxAtomicBufferSize = c->Program[MESA_SHADER_FRAGMENT].MaxAtomicCounters * ATOMIC_COUNTER_SIZE;
 441       /* on all HW with separate atomic (evergreen) the following
 442          lines are true. not sure it's worth adding CAPs for this at this
 443          stage. */
 444       c->MaxCombinedAtomicCounters = c->Program[MESA_SHADER_FRAGMENT].MaxAtomicCounters;
 445       c->MaxCombinedAtomicBuffers = c->Program[MESA_SHADER_FRAGMENT].MaxAtomicBuffers;
 446    } else {
 447       c->MaxCombinedAtomicBuffers =
 448          c->Program[MESA_SHADER_VERTEX].MaxAtomicBuffers +
 449          c->Program[MESA_SHADER_TESS_CTRL].MaxAtomicBuffers +
 450          c->Program[MESA_SHADER_TESS_EVAL].MaxAtomicBuffers +
 451          c->Program[MESA_SHADER_GEOMETRY].MaxAtomicBuffers +
 452          c->Program[MESA_SHADER_FRAGMENT].MaxAtomicBuffers;
 453       assert(c->MaxCombinedAtomicBuffers <= MAX_COMBINED_ATOMIC_BUFFERS);
 454    }
 455
 456    if (c->MaxCombinedAtomicBuffers > 0) {
 457       extensions->ARB_shader_atomic_counters = GL_TRUE;
 458       extensions->ARB_shader_atomic_counter_ops = GL_TRUE;
 459    }
 460
 461    c->MaxCombinedShaderOutputResources = c->MaxDrawBuffers;
 462    c->ShaderStorageBufferOffsetAlignment =
 463       screen->get_param(screen, PIPE_CAP_SHADER_BUFFER_OFFSET_ALIGNMENT);
 464    if (c->ShaderStorageBufferOffsetAlignment) {
 465       /* for hw atomic counters leaves these at default for now */
 466       if (ssbo_atomic)
 467          c->MaxCombinedShaderStorageBlocks = c->MaxShaderStorageBufferBindings =
 468             c->MaxCombinedAtomicBuffers;
 469       c->MaxCombinedShaderOutputResources +=
 470          c->MaxCombinedShaderStorageBlocks;
 471       c->MaxShaderStorageBlockSize = 1 << 27;
 472       extensions->ARB_shader_storage_buffer_object = GL_TRUE;
 473    }
 474
 475    c->MaxCombinedImageUniforms =
 476          c->Program[MESA_SHADER_VERTEX].MaxImageUniforms +
 477          c->Program[MESA_SHADER_TESS_CTRL].MaxImageUniforms +
 478          c->Program[MESA_SHADER_TESS_EVAL].MaxImageUniforms +
 479          c->Program[MESA_SHADER_GEOMETRY].MaxImageUniforms +
 480          c->Program[MESA_SHADER_FRAGMENT].MaxImageUniforms;
 481    c->MaxCombinedShaderOutputResources += c->MaxCombinedImageUniforms;
 482    c->MaxImageUnits = MAX_IMAGE_UNITS;
 483    if (c->MaxCombinedImageUniforms) {
 484       extensions->ARB_shader_image_load_store = GL_TRUE;
 485       extensions->ARB_shader_image_size = GL_TRUE;
 486    }
 487
 488    /* ARB_framebuffer_no_attachments */
 489    c->MaxFramebufferWidth   = c->MaxViewportWidth;
 490    c->MaxFramebufferHeight  = c->MaxViewportHeight;
 491    /* NOTE: we cheat here a little by assuming that
 492     * PIPE_CAP_MAX_TEXTURE_ARRAY_LAYERS has the same
 493     * number of layers as we need, although we technically
 494     * could have more the generality is not really useful
 495     * in practicality.
 496     */
 497    c->MaxFramebufferLayers =
 498       screen->get_param(screen, PIPE_CAP_MAX_TEXTURE_ARRAY_LAYERS);
 499
 500    c->MaxWindowRectangles =
 501       screen->get_param(screen, PIPE_CAP_MAX_WINDOW_RECTANGLES);
 502
 503    c->SparseBufferPageSize =
 504       screen->get_param(screen, PIPE_CAP_SPARSE_BUFFER_PAGE_SIZE);
 505
 506    c->AllowMappedBuffersDuringExecution =
 507       screen->get_param(screen, PIPE_CAP_ALLOW_MAPPED_BUFFERS_DURING_EXECUTION);
 508
 509    c->UseSTD430AsDefaultPacking =
 510       screen->get_param(screen, PIPE_CAP_LOAD_CONSTBUF);
 511
 512    c->MaxSubpixelPrecisionBiasBits =
 513       screen->get_param(screen, PIPE_CAP_MAX_CONSERVATIVE_RASTER_SUBPIXEL_PRECISION_BIAS);
 514
 515    c->ConservativeRasterDilateRange[0] =
 516       screen->get_paramf(screen, PIPE_CAPF_MIN_CONSERVATIVE_RASTER_DILATE);
 517    c->ConservativeRasterDilateRange[1] =
 518       screen->get_paramf(screen, PIPE_CAPF_MAX_CONSERVATIVE_RASTER_DILATE);
 519    c->ConservativeRasterDilateGranularity =
 520       screen->get_paramf(screen, PIPE_CAPF_CONSERVATIVE_RASTER_DILATE_GRANULARITY);
 521
 522    /* limit the max combined shader output resources to a driver limit */
 523    temp = screen->get_param(screen, PIPE_CAP_MAX_COMBINED_SHADER_OUTPUT_RESOURCES);
 524    if (temp > 0 && c->MaxCombinedShaderOutputResources > temp)
 525       c->MaxCombinedShaderOutputResources = temp;
 526 }
 527
 528
 529 /**
 530  * Given a member \c x of struct gl_extensions, return offset of
 531  * \c x in bytes.
 532  */
 533 #define o(x) offsetof(struct gl_extensions, x)
 534
 535
 536 struct st_extension_cap_mapping {
 537    int extension_offset;
 538    int cap;
 539 };
 540
 541 struct st_extension_format_mapping {
 542    int extension_offset[2];
 543    enum pipe_format format[32];
 544
 545    /* If TRUE, at least one format must be supported for the extensions to be
 546     * advertised. If FALSE, all the formats must be supported. */
 547    GLboolean need_at_least_one;
 548 };
 549
 550 /**
 551  * Enable extensions if certain pipe formats are supported by the driver.
 552  * What extensions will be enabled and what formats must be supported is
 553  * described by the array of st_extension_format_mapping.
 554  *
 555  * target and bind_flags are passed to is_format_supported.
 556  */
 557 static void
 558 init_format_extensions(struct pipe_screen *screen,
 559                        struct gl_extensions *extensions,
 560                        const struct st_extension_format_mapping *mapping,
 561                        unsigned num_mappings,
 562                        enum pipe_texture_target target,
 563                        unsigned bind_flags)
 564 {
 565    GLboolean *extension_table = (GLboolean *) extensions;
 566    unsigned i;
 567    int j;
 568    int num_formats = ARRAY_SIZE(mapping->format);
 569    int num_ext = ARRAY_SIZE(mapping->extension_offset);
 570
 571    for (i = 0; i < num_mappings; i++) {
 572       int num_supported = 0;
 573
 574       /* Examine each format in the list. */
 575       for (j = 0; j < num_formats && mapping[i].format[j]; j++) {
 576          if (screen->is_format_supported(screen, mapping[i].format[j],
 577                                          target, 0, 0, bind_flags)) {
 578             num_supported++;
 579          }
 580       }
 581
 582       if (!num_supported ||
 583           (!mapping[i].need_at_least_one && num_supported != j)) {
 584          continue;
 585       }
 586
 587       /* Enable all extensions in the list. */
 588       for (j = 0; j < num_ext && mapping[i].extension_offset[j]; j++)
 589          extension_table[mapping[i].extension_offset[j]] = GL_TRUE;
 590    }
 591 }
 592
 593
 594 /**
 595  * Given a list of formats and bind flags, return the maximum number
 596  * of samples supported by any of those formats.
 597  */
 598 static unsigned
 599 get_max_samples_for_formats(struct pipe_screen *screen,
 600                             unsigned num_formats,
 601                             const enum pipe_format *formats,
 602                             unsigned max_samples,
 603                             unsigned bind)
 604 {
 605    unsigned i, f;
 606
 607    for (i = max_samples; i > 0; --i) {
 608       for (f = 0; f < num_formats; f++) {
 609          if (screen->is_format_supported(screen, formats[f],
 610                                          PIPE_TEXTURE_2D, i, i, bind)) {
 611             return i;
 612          }
 613       }
 614    }
 615    return 0;
 616 }
 617
 618 static unsigned
 619 get_max_samples_for_formats_advanced(struct pipe_screen *screen,
 620                                      unsigned num_formats,
 621                                      const enum pipe_format *formats,
 622                                      unsigned max_samples,
 623                                      unsigned num_storage_samples,
 624                                      unsigned bind)
 625 {
 626    unsigned i, f;
 627
 628    for (i = max_samples; i > 0; --i) {
 629       for (f = 0; f < num_formats; f++) {
 630          if (screen->is_format_supported(screen, formats[f], PIPE_TEXTURE_2D,
 631                                          i, num_storage_samples, bind)) {
 632             return i;
 633          }
 634       }
 635    }
 636    return 0;
 637 }
 638
 639 /**
 640  * Use pipe_screen::get_param() to query PIPE_CAP_ values to determine
 641  * which GL extensions are supported.
 642  * Quite a few extensions are always supported because they are standard
 643  * features or can be built on top of other gallium features.
 644  * Some fine tuning may still be needed.
 645  */
 646 void st_init_extensions(struct pipe_screen *screen,
 647                         struct gl_constants *consts,
 648                         struct gl_extensions *extensions,
 649                         struct st_config_options *options,
 650                         gl_api api)
 651 {
 652    unsigned i;
 653    GLboolean *extension_table = (GLboolean *) extensions;
 654
 655    static const struct st_extension_cap_mapping cap_mapping[] = {
 656       { o(ARB_base_instance),                PIPE_CAP_START_INSTANCE                   },
 657       { o(ARB_bindless_texture),             PIPE_CAP_BINDLESS_TEXTURE                 },
 658       { o(ARB_buffer_storage),               PIPE_CAP_BUFFER_MAP_PERSISTENT_COHERENT   },
 659       { o(ARB_clear_texture),                PIPE_CAP_CLEAR_TEXTURE                    },
 660       { o(ARB_clip_control),                 PIPE_CAP_CLIP_HALFZ                       },
 661       { o(ARB_color_buffer_float),           PIPE_CAP_VERTEX_COLOR_UNCLAMPED           },
 662       { o(ARB_conditional_render_inverted),  PIPE_CAP_CONDITIONAL_RENDER_INVERTED      },
 663       { o(ARB_copy_image),                   PIPE_CAP_COPY_BETWEEN_COMPRESSED_AND_PLAIN_FORMATS },
 664       { o(OES_copy_image),                   PIPE_CAP_COPY_BETWEEN_COMPRESSED_AND_PLAIN_FORMATS },
 665       { o(ARB_cull_distance),                PIPE_CAP_CULL_DISTANCE                    },
 666       { o(ARB_depth_clamp),                  PIPE_CAP_DEPTH_CLIP_DISABLE               },
 667       { o(ARB_derivative_control),           PIPE_CAP_TGSI_FS_FINE_DERIVATIVE          },
 668       { o(ARB_draw_buffers_blend),           PIPE_CAP_INDEP_BLEND_FUNC                 },
 669       { o(ARB_draw_indirect),                PIPE_CAP_DRAW_INDIRECT                    },
 670       { o(ARB_draw_instanced),               PIPE_CAP_TGSI_INSTANCEID                  },
 671       { o(ARB_framebuffer_object),           PIPE_CAP_MIXED_FRAMEBUFFER_SIZES          },
 672       { o(ARB_gpu_shader_int64),             PIPE_CAP_INT64                            },
 673       { o(ARB_indirect_parameters),          PIPE_CAP_MULTI_DRAW_INDIRECT_PARAMS       },
 674       { o(ARB_instanced_arrays),             PIPE_CAP_VERTEX_ELEMENT_INSTANCE_DIVISOR  },
 675       { o(ARB_occlusion_query),              PIPE_CAP_OCCLUSION_QUERY                  },
 676       { o(ARB_occlusion_query2),             PIPE_CAP_OCCLUSION_QUERY                  },
 677       { o(ARB_pipeline_statistics_query),    PIPE_CAP_QUERY_PIPELINE_STATISTICS        },
 678       { o(ARB_point_sprite),                 PIPE_CAP_POINT_SPRITE                     },
 679       { o(ARB_polygon_offset_clamp),         PIPE_CAP_POLYGON_OFFSET_CLAMP             },
 680       { o(ARB_post_depth_coverage),          PIPE_CAP_POST_DEPTH_COVERAGE              },
 681       { o(ARB_query_buffer_object),          PIPE_CAP_QUERY_BUFFER_OBJECT              },
 682       { o(ARB_robust_buffer_access_behavior), PIPE_CAP_ROBUST_BUFFER_ACCESS_BEHAVIOR   },
 683       { o(ARB_sample_shading),               PIPE_CAP_SAMPLE_SHADING                   },
 684       { o(ARB_sample_locations),             PIPE_CAP_PROGRAMMABLE_SAMPLE_LOCATIONS    },
 685       { o(ARB_seamless_cube_map),            PIPE_CAP_SEAMLESS_CUBE_MAP                },
 686       { o(ARB_shader_ballot),                PIPE_CAP_TGSI_BALLOT                      },
 687       { o(ARB_shader_clock),                 PIPE_CAP_TGSI_CLOCK                       },
 688       { o(ARB_shader_draw_parameters),       PIPE_CAP_DRAW_PARAMETERS                  },
 689       { o(ARB_shader_group_vote),            PIPE_CAP_TGSI_VOTE                        },
 690       { o(ARB_shader_stencil_export),        PIPE_CAP_SHADER_STENCIL_EXPORT            },
 691       { o(ARB_shader_texture_image_samples), PIPE_CAP_TGSI_TXQS                        },
 692       { o(ARB_shader_texture_lod),           PIPE_CAP_SM3                              },
 693       { o(ARB_sparse_buffer),                PIPE_CAP_SPARSE_BUFFER_PAGE_SIZE          },
 694       { o(ARB_texture_buffer_object),        PIPE_CAP_TEXTURE_BUFFER_OBJECTS           },
 695       { o(ARB_texture_cube_map_array),       PIPE_CAP_CUBE_MAP_ARRAY                   },
 696       { o(ARB_texture_gather),               PIPE_CAP_MAX_TEXTURE_GATHER_COMPONENTS    },
 697       { o(ARB_texture_mirror_clamp_to_edge), PIPE_CAP_TEXTURE_MIRROR_CLAMP             },
 698       { o(ARB_texture_multisample),          PIPE_CAP_TEXTURE_MULTISAMPLE              },
 699       { o(ARB_texture_non_power_of_two),     PIPE_CAP_NPOT_TEXTURES                    },
 700       { o(ARB_texture_query_lod),            PIPE_CAP_TEXTURE_QUERY_LOD                },
 701       { o(ARB_texture_view),                 PIPE_CAP_SAMPLER_VIEW_TARGET              },
 702       { o(ARB_timer_query),                  PIPE_CAP_QUERY_TIMESTAMP                  },
 703       { o(ARB_transform_feedback2),          PIPE_CAP_STREAM_OUTPUT_PAUSE_RESUME       },
 704       { o(ARB_transform_feedback3),          PIPE_CAP_STREAM_OUTPUT_INTERLEAVE_BUFFERS },
 705       { o(ARB_transform_feedback_overflow_query), PIPE_CAP_QUERY_SO_OVERFLOW           },
 706
 707       { o(KHR_blend_equation_advanced),      PIPE_CAP_TGSI_FS_FBFETCH                  },
 708
 709       { o(EXT_blend_equation_separate),      PIPE_CAP_BLEND_EQUATION_SEPARATE          },
 710       { o(EXT_depth_bounds_test),            PIPE_CAP_DEPTH_BOUNDS_TEST                },
 711       { o(EXT_draw_buffers2),                PIPE_CAP_INDEP_BLEND_ENABLE               },
 712       { o(EXT_memory_object),                PIPE_CAP_MEMOBJ                           },
 713       { o(EXT_memory_object_fd),             PIPE_CAP_MEMOBJ                           },
 714       { o(EXT_semaphore),                    PIPE_CAP_FENCE_SIGNAL                     },
 715       { o(EXT_semaphore_fd),                 PIPE_CAP_FENCE_SIGNAL                     },
 716       { o(EXT_texture_array),                PIPE_CAP_MAX_TEXTURE_ARRAY_LAYERS         },
 717       { o(EXT_texture_filter_anisotropic),   PIPE_CAP_ANISOTROPIC_FILTER               },
 718       { o(EXT_texture_mirror_clamp),         PIPE_CAP_TEXTURE_MIRROR_CLAMP             },
 719       { o(EXT_texture_swizzle),              PIPE_CAP_TEXTURE_SWIZZLE                  },
 720       { o(EXT_transform_feedback),           PIPE_CAP_MAX_STREAM_OUTPUT_BUFFERS        },
 721       { o(EXT_window_rectangles),            PIPE_CAP_MAX_WINDOW_RECTANGLES            },
 722
 723       { o(AMD_framebuffer_multisample_advanced), PIPE_CAP_FRAMEBUFFER_MSAA_CONSTRAINTS },
 724       { o(AMD_pinned_memory),                PIPE_CAP_RESOURCE_FROM_USER_MEMORY        },
 725       { o(ATI_meminfo),                      PIPE_CAP_QUERY_MEMORY_INFO                },
 726       { o(AMD_seamless_cubemap_per_texture), PIPE_CAP_SEAMLESS_CUBE_MAP_PER_TEXTURE    },
 727       { o(ATI_texture_mirror_once),          PIPE_CAP_TEXTURE_MIRROR_CLAMP             },
 728       { o(MESA_tile_raster_order),           PIPE_CAP_TILE_RASTER_ORDER                },
 729       { o(NV_conditional_render),            PIPE_CAP_CONDITIONAL_RENDER               },
 730       { o(NV_fill_rectangle),                PIPE_CAP_POLYGON_MODE_FILL_RECTANGLE      },
 731       { o(NV_primitive_restart),             PIPE_CAP_PRIMITIVE_RESTART                },
 732       { o(NV_texture_barrier),               PIPE_CAP_TEXTURE_BARRIER                  },
 733       { o(NVX_gpu_memory_info),              PIPE_CAP_QUERY_MEMORY_INFO                },
 734       /* GL_NV_point_sprite is not supported by gallium because we don't
 735        * support the GL_POINT_SPRITE_R_MODE_NV option. */
 736
 737       { o(OES_standard_derivatives),         PIPE_CAP_SM3                              },
 738       { o(OES_texture_float_linear),         PIPE_CAP_TEXTURE_FLOAT_LINEAR             },
 739       { o(OES_texture_half_float_linear),    PIPE_CAP_TEXTURE_HALF_FLOAT_LINEAR        },
 740    };
 741
 742    /* Required: render target and sampler support */
 743    static const struct st_extension_format_mapping rendertarget_mapping[] = {
 744       { { o(ARB_texture_float) },
 745         { PIPE_FORMAT_R32G32B32A32_FLOAT,
 746           PIPE_FORMAT_R16G16B16A16_FLOAT } },
 747
 748       { { o(OES_texture_float) },
 749         { PIPE_FORMAT_R32G32B32A32_FLOAT } },
 750
 751       { { o(OES_texture_half_float) },
 752         { PIPE_FORMAT_R16G16B16A16_FLOAT } },
 753
 754       { { o(ARB_texture_rgb10_a2ui) },
 755         { PIPE_FORMAT_R10G10B10A2_UINT,
 756           PIPE_FORMAT_B10G10R10A2_UINT },
 757          GL_TRUE }, /* at least one format must be supported */
 758
 759       { { o(EXT_framebuffer_sRGB) },
 760         { PIPE_FORMAT_A8B8G8R8_SRGB,
 761           PIPE_FORMAT_B8G8R8A8_SRGB,
 762           PIPE_FORMAT_R8G8B8A8_SRGB },
 763          GL_TRUE }, /* at least one format must be supported */
 764
 765       { { o(EXT_packed_float) },
 766         { PIPE_FORMAT_R11G11B10_FLOAT } },
 767
 768       { { o(EXT_texture_integer) },
 769         { PIPE_FORMAT_R32G32B32A32_UINT,
 770           PIPE_FORMAT_R32G32B32A32_SINT } },
 771
 772       { { o(ARB_texture_rg) },
 773         { PIPE_FORMAT_R8_UNORM,
 774           PIPE_FORMAT_R8G8_UNORM } },
 775    };
 776
 777    /* Required: depth stencil and sampler support */
 778    static const struct st_extension_format_mapping depthstencil_mapping[] = {
 779       { { o(ARB_depth_buffer_float) },
 780         { PIPE_FORMAT_Z32_FLOAT,
 781           PIPE_FORMAT_Z32_FLOAT_S8X24_UINT } },
 782    };
 783
 784    /* Required: sampler support */
 785    static const struct st_extension_format_mapping texture_mapping[] = {
 786       { { o(ARB_texture_compression_rgtc) },
 787         { PIPE_FORMAT_RGTC1_UNORM,
 788           PIPE_FORMAT_RGTC1_SNORM,
 789           PIPE_FORMAT_RGTC2_UNORM,
 790           PIPE_FORMAT_RGTC2_SNORM } },
 791
 792       { { o(EXT_texture_compression_latc) },
 793         { PIPE_FORMAT_LATC1_UNORM,
 794           PIPE_FORMAT_LATC1_SNORM,
 795           PIPE_FORMAT_LATC2_UNORM,
 796           PIPE_FORMAT_LATC2_SNORM } },
 797
 798       { { o(EXT_texture_compression_s3tc),
 799           o(ANGLE_texture_compression_dxt) },
 800         { PIPE_FORMAT_DXT1_RGB,
 801           PIPE_FORMAT_DXT1_RGBA,
 802           PIPE_FORMAT_DXT3_RGBA,
 803           PIPE_FORMAT_DXT5_RGBA } },
 804
 805       { { o(ARB_texture_compression_bptc) },
 806         { PIPE_FORMAT_BPTC_RGBA_UNORM,
 807           PIPE_FORMAT_BPTC_SRGBA,
 808           PIPE_FORMAT_BPTC_RGB_FLOAT,
 809           PIPE_FORMAT_BPTC_RGB_UFLOAT } },
 810
 811       { { o(KHR_texture_compression_astc_ldr) },
 812         { PIPE_FORMAT_ASTC_4x4,
 813           PIPE_FORMAT_ASTC_5x4,
 814           PIPE_FORMAT_ASTC_5x5,
 815           PIPE_FORMAT_ASTC_6x5,
 816           PIPE_FORMAT_ASTC_6x6,
 817           PIPE_FORMAT_ASTC_8x5,
 818           PIPE_FORMAT_ASTC_8x6,
 819           PIPE_FORMAT_ASTC_8x8,
 820           PIPE_FORMAT_ASTC_10x5,
 821           PIPE_FORMAT_ASTC_10x6,
 822           PIPE_FORMAT_ASTC_10x8,
 823           PIPE_FORMAT_ASTC_10x10,
 824           PIPE_FORMAT_ASTC_12x10,
 825           PIPE_FORMAT_ASTC_12x12,
 826           PIPE_FORMAT_ASTC_4x4_SRGB,
 827           PIPE_FORMAT_ASTC_5x4_SRGB,
 828           PIPE_FORMAT_ASTC_5x5_SRGB,
 829           PIPE_FORMAT_ASTC_6x5_SRGB,
 830           PIPE_FORMAT_ASTC_6x6_SRGB,
 831           PIPE_FORMAT_ASTC_8x5_SRGB,
 832           PIPE_FORMAT_ASTC_8x6_SRGB,
 833           PIPE_FORMAT_ASTC_8x8_SRGB,
 834           PIPE_FORMAT_ASTC_10x5_SRGB,
 835           PIPE_FORMAT_ASTC_10x6_SRGB,
 836           PIPE_FORMAT_ASTC_10x8_SRGB,
 837           PIPE_FORMAT_ASTC_10x10_SRGB,
 838           PIPE_FORMAT_ASTC_12x10_SRGB,
 839           PIPE_FORMAT_ASTC_12x12_SRGB } },
 840
 841       /* ASTC software fallback support. */
 842       { { o(KHR_texture_compression_astc_ldr) },
 843         { PIPE_FORMAT_R8G8B8A8_UNORM,
 844           PIPE_FORMAT_R8G8B8A8_SRGB } },
 845
 846       { { o(EXT_texture_shared_exponent) },
 847         { PIPE_FORMAT_R9G9B9E5_FLOAT } },
 848
 849       { { o(EXT_texture_snorm) },
 850         { PIPE_FORMAT_R8G8B8A8_SNORM } },
 851
 852       { { o(EXT_texture_sRGB),
 853           o(EXT_texture_sRGB_decode) },
 854         { PIPE_FORMAT_A8B8G8R8_SRGB,
 855           PIPE_FORMAT_B8G8R8A8_SRGB,
 856           PIPE_FORMAT_A8R8G8B8_SRGB,
 857           PIPE_FORMAT_R8G8B8A8_SRGB},
 858         GL_TRUE }, /* at least one format must be supported */
 859
 860       { { o(EXT_texture_type_2_10_10_10_REV) },
 861         { PIPE_FORMAT_R10G10B10A2_UNORM,
 862           PIPE_FORMAT_B10G10R10A2_UNORM },
 863          GL_TRUE }, /* at least one format must be supported */
 864
 865       { { o(ATI_texture_compression_3dc) },
 866         { PIPE_FORMAT_LATC2_UNORM } },
 867
 868       { { o(MESA_ycbcr_texture) },
 869         { PIPE_FORMAT_UYVY,
 870           PIPE_FORMAT_YUYV },
 871         GL_TRUE }, /* at least one format must be supported */
 872
 873       { { o(OES_compressed_ETC1_RGB8_texture) },
 874         { PIPE_FORMAT_ETC1_RGB8,
 875           PIPE_FORMAT_R8G8B8A8_UNORM },
 876         GL_TRUE }, /* at least one format must be supported */
 877
 878       { { o(ARB_stencil_texturing),
 879           o(ARB_texture_stencil8) },
 880         { PIPE_FORMAT_X24S8_UINT,
 881           PIPE_FORMAT_S8X24_UINT },
 882         GL_TRUE }, /* at least one format must be supported */
 883    };
 884
 885    /* Required: vertex fetch support. */
 886    static const struct st_extension_format_mapping vertex_mapping[] = {
 887       { { o(EXT_vertex_array_bgra) },
 888         { PIPE_FORMAT_B8G8R8A8_UNORM } },
 889       { { o(ARB_vertex_type_2_10_10_10_rev) },
 890         { PIPE_FORMAT_R10G10B10A2_UNORM,
 891           PIPE_FORMAT_B10G10R10A2_UNORM,
 892           PIPE_FORMAT_R10G10B10A2_SNORM,
 893           PIPE_FORMAT_B10G10R10A2_SNORM,
 894           PIPE_FORMAT_R10G10B10A2_USCALED,
 895           PIPE_FORMAT_B10G10R10A2_USCALED,
 896           PIPE_FORMAT_R10G10B10A2_SSCALED,
 897           PIPE_FORMAT_B10G10R10A2_SSCALED } },
 898       { { o(ARB_vertex_type_10f_11f_11f_rev) },
 899         { PIPE_FORMAT_R11G11B10_FLOAT } },
 900    };
 901
 902    static const struct st_extension_format_mapping tbo_rgb32[] = {
 903       { {o(ARB_texture_buffer_object_rgb32) },
 904         { PIPE_FORMAT_R32G32B32_FLOAT,
 905           PIPE_FORMAT_R32G32B32_UINT,
 906           PIPE_FORMAT_R32G32B32_SINT,
 907         } },
 908    };
 909
 910    /*
 911     * Extensions that are supported by all Gallium drivers:
 912     */
 913    extensions->ARB_ES2_compatibility = GL_TRUE;
 914    extensions->ARB_depth_texture = GL_TRUE;
 915    extensions->ARB_draw_elements_base_vertex = GL_TRUE;
 916    extensions->ARB_explicit_attrib_location = GL_TRUE;
 917    extensions->ARB_explicit_uniform_location = GL_TRUE;
 918    extensions->ARB_fragment_coord_conventions = GL_TRUE;
 919    extensions->ARB_fragment_program = GL_TRUE;
 920    extensions->ARB_fragment_program_shadow = GL_TRUE;
 921    extensions->ARB_fragment_shader = GL_TRUE;
 922    extensions->ARB_half_float_vertex = GL_TRUE;
 923    extensions->ARB_internalformat_query = GL_TRUE;
 924    extensions->ARB_internalformat_query2 = GL_TRUE;
 925    extensions->ARB_map_buffer_range = GL_TRUE;
 926    extensions->ARB_shadow = GL_TRUE;
 927    extensions->ARB_sync = GL_TRUE;
 928    extensions->ARB_texture_border_clamp = GL_TRUE;
 929    extensions->ARB_texture_cube_map = GL_TRUE;
 930    extensions->ARB_texture_env_combine = GL_TRUE;
 931    extensions->ARB_texture_env_crossbar = GL_TRUE;
 932    extensions->ARB_texture_env_dot3 = GL_TRUE;
 933    extensions->ARB_vertex_program = GL_TRUE;
 934    extensions->ARB_vertex_shader = GL_TRUE;
 935
 936    extensions->EXT_blend_color = GL_TRUE;
 937    extensions->EXT_blend_func_separate = GL_TRUE;
 938    extensions->EXT_blend_minmax = GL_TRUE;
 939    extensions->EXT_gpu_program_parameters = GL_TRUE;
 940    extensions->EXT_pixel_buffer_object = GL_TRUE;
 941    extensions->EXT_point_parameters = GL_TRUE;
 942    extensions->EXT_provoking_vertex = GL_TRUE;
 943    extensions->EXT_stencil_two_side = GL_TRUE;
 944    extensions->EXT_texture_env_dot3 = GL_TRUE;
 945
 946    extensions->ATI_fragment_shader = GL_TRUE;
 947    extensions->ATI_texture_env_combine3 = GL_TRUE;
 948
 949    extensions->MESA_pack_invert = GL_TRUE;
 950
 951    extensions->NV_fog_distance = GL_TRUE;
 952    extensions->NV_texture_env_combine4 = GL_TRUE;
 953    extensions->NV_texture_rectangle = GL_TRUE;
 954
 955    extensions->OES_EGL_image = GL_TRUE;
 956    extensions->OES_EGL_image_external = GL_TRUE;
 957    extensions->OES_draw_texture = GL_TRUE;
 958
 959    /* Expose the extensions which directly correspond to gallium caps. */
 960    for (i = 0; i < ARRAY_SIZE(cap_mapping); i++) {
 961       if (screen->get_param(screen, cap_mapping[i].cap)) {
 962          extension_table[cap_mapping[i].extension_offset] = GL_TRUE;
 963       }
 964    }
 965
 966    /* Expose the extensions which directly correspond to gallium formats. */
 967    init_format_extensions(screen, extensions, rendertarget_mapping,
 968                           ARRAY_SIZE(rendertarget_mapping), PIPE_TEXTURE_2D,
 969                           PIPE_BIND_RENDER_TARGET | PIPE_BIND_SAMPLER_VIEW);
 970    init_format_extensions(screen, extensions, depthstencil_mapping,
 971                           ARRAY_SIZE(depthstencil_mapping), PIPE_TEXTURE_2D,
 972                           PIPE_BIND_DEPTH_STENCIL | PIPE_BIND_SAMPLER_VIEW);
 973    init_format_extensions(screen, extensions, texture_mapping,
 974                           ARRAY_SIZE(texture_mapping), PIPE_TEXTURE_2D,
 975                           PIPE_BIND_SAMPLER_VIEW);
 976    init_format_extensions(screen, extensions, vertex_mapping,
 977                           ARRAY_SIZE(vertex_mapping), PIPE_BUFFER,
 978                           PIPE_BIND_VERTEX_BUFFER);
 979
 980    /* Figure out GLSL support and set GLSLVersion to it. */
 981    consts->GLSLVersion = screen->get_param(screen, PIPE_CAP_GLSL_FEATURE_LEVEL);
 982    consts->GLSLVersionCompat =
 983       screen->get_param(screen, PIPE_CAP_GLSL_FEATURE_LEVEL_COMPATIBILITY);
 984
 985    const unsigned GLSLVersion =
 986       api == API_OPENGL_COMPAT ? consts->GLSLVersionCompat :
 987                                  consts->GLSLVersion;
 988
 989    _mesa_override_glsl_version(consts);
 990
 991    if (options->force_glsl_version > 0 &&
 992        options->force_glsl_version <= GLSLVersion) {
 993       consts->ForceGLSLVersion = options->force_glsl_version;
 994    }
 995
 996    consts->AllowHigherCompatVersion = options->allow_higher_compat_version;
 997
 998    consts->ForceGLSLAbsSqrt = options->force_glsl_abs_sqrt;
 999
1000    consts->AllowGLSLBuiltinVariableRedeclaration = options->allow_glsl_builtin_variable_redeclaration;
1001
1002    consts->dri_config_options_sha1 = options->config_options_sha1;
1003
1004    consts->AllowGLSLCrossStageInterpolationMismatch = options->allow_glsl_cross_stage_interpolation_mismatch;
1005
1006    if (GLSLVersion >= 400)
1007       extensions->ARB_gpu_shader5 = GL_TRUE;
1008    if (GLSLVersion >= 410)
1009       extensions->ARB_shader_precision = GL_TRUE;
1010
1011    /* This extension needs full OpenGL 3.2, but we don't know if that's
1012     * supported at this point. Only check the GLSL version. */
1013    if (GLSLVersion >= 150 &&
1014        screen->get_param(screen, PIPE_CAP_TGSI_VS_LAYER_VIEWPORT)) {
1015       extensions->AMD_vertex_shader_layer = GL_TRUE;
1016    }
1017
1018    if (GLSLVersion >= 140) {
1019       if (screen->get_param(screen, PIPE_CAP_TGSI_ARRAY_COMPONENTS))
1020          extensions->ARB_enhanced_layouts = GL_TRUE;
1021    }
1022
1023    if (GLSLVersion >= 130) {
1024       consts->NativeIntegers = GL_TRUE;
1025       consts->MaxClipPlanes = 8;
1026
1027       if (screen->get_param(screen, PIPE_CAP_VERTEXID_NOBASE)) {
1028          consts->VertexID_is_zero_based = GL_TRUE;
1029       }
1030
1031       /* Extensions that either depend on GLSL 1.30 or are a subset thereof. */
1032       extensions->ARB_conservative_depth = GL_TRUE;
1033       extensions->ARB_shading_language_packing = GL_TRUE;
1034       extensions->OES_depth_texture_cube_map = GL_TRUE;
1035       extensions->ARB_shading_language_420pack = GL_TRUE;
1036       extensions->ARB_texture_query_levels = GL_TRUE;
1037
1038       extensions->ARB_shader_bit_encoding = GL_TRUE;
1039
1040       extensions->EXT_shader_integer_mix = GL_TRUE;
1041       extensions->ARB_arrays_of_arrays = GL_TRUE;
1042       extensions->MESA_shader_integer_functions = GL_TRUE;
1043    } else {
1044       /* Optional integer support for GLSL 1.2. */
1045       if (screen->get_shader_param(screen, PIPE_SHADER_VERTEX,
1046                                    PIPE_SHADER_CAP_INTEGERS) &&
1047           screen->get_shader_param(screen, PIPE_SHADER_FRAGMENT,
1048                                    PIPE_SHADER_CAP_INTEGERS)) {
1049          consts->NativeIntegers = GL_TRUE;
1050
1051          extensions->EXT_shader_integer_mix = GL_TRUE;
1052       }
1053
1054       /* Integer textures make no sense before GLSL 1.30 */
1055       extensions->EXT_texture_integer = GL_FALSE;
1056    }
1057
1058    consts->GLSLZeroInit = options->glsl_zero_init;
1059
1060    consts->UniformBooleanTrue = consts->NativeIntegers ? ~0U : fui(1.0f);
1061
1062    /* Below are the cases which cannot be moved into tables easily. */
1063
1064    /* The compatibility profile also requires GLSLVersionCompat >= 400. */
1065    if (screen->get_shader_param(screen, PIPE_SHADER_TESS_CTRL,
1066                                 PIPE_SHADER_CAP_MAX_INSTRUCTIONS) > 0 &&
1067        (api != API_OPENGL_COMPAT || consts->GLSLVersionCompat >= 400)) {
1068       extensions->ARB_tessellation_shader = GL_TRUE;
1069    }
1070
1071    /* What this is really checking for is the ability to support multiple
1072     * invocations of a geometry shader. There is no separate cap for that, so
1073     * we check the GLSLVersion.
1074     */
1075    if (GLSLVersion >= 400 &&
1076        screen->get_shader_param(screen, PIPE_SHADER_GEOMETRY,
1077                                 PIPE_SHADER_CAP_MAX_INSTRUCTIONS) > 0) {
1078       extensions->OES_geometry_shader = GL_TRUE;
1079    }
1080
1081    /* Needs PIPE_CAP_SAMPLE_SHADING + all the sample-related bits of
1082     * ARB_gpu_shader5. This enables all the per-sample shading ES extensions.
1083     */
1084    extensions->OES_sample_variables = extensions->ARB_sample_shading &&
1085       extensions->ARB_gpu_shader5;
1086
1087    /* Maximum sample count. */
1088    {
1089       static const enum pipe_format color_formats[] = {
1090          PIPE_FORMAT_R8G8B8A8_UNORM,
1091          PIPE_FORMAT_B8G8R8A8_UNORM,
1092          PIPE_FORMAT_A8R8G8B8_UNORM,
1093          PIPE_FORMAT_A8B8G8R8_UNORM,
1094       };
1095       static const enum pipe_format depth_formats[] = {
1096          PIPE_FORMAT_Z16_UNORM,
1097          PIPE_FORMAT_Z24X8_UNORM,
1098          PIPE_FORMAT_X8Z24_UNORM,
1099          PIPE_FORMAT_Z32_UNORM,
1100          PIPE_FORMAT_Z32_FLOAT
1101       };
1102       static const enum pipe_format int_formats[] = {
1103          PIPE_FORMAT_R8G8B8A8_SINT
1104       };
1105       static const enum pipe_format void_formats[] = {
1106          PIPE_FORMAT_NONE
1107       };
1108
1109       consts->MaxSamples =
1110          get_max_samples_for_formats(screen, ARRAY_SIZE(color_formats),
1111                                      color_formats, 16,
1112                                      PIPE_BIND_RENDER_TARGET);
1113
1114       consts->MaxImageSamples =
1115          get_max_samples_for_formats(screen, ARRAY_SIZE(color_formats),
1116                                      color_formats, 16,
1117                                      PIPE_BIND_SHADER_IMAGE);
1118
1119       consts->MaxColorTextureSamples =
1120          get_max_samples_for_formats(screen, ARRAY_SIZE(color_formats),
1121                                      color_formats, consts->MaxSamples,
1122                                      PIPE_BIND_SAMPLER_VIEW);
1123
1124       consts->MaxDepthTextureSamples =
1125          get_max_samples_for_formats(screen, ARRAY_SIZE(depth_formats),
1126                                      depth_formats, consts->MaxSamples,
1127                                      PIPE_BIND_SAMPLER_VIEW);
1128
1129       consts->MaxIntegerSamples =
1130          get_max_samples_for_formats(screen, ARRAY_SIZE(int_formats),
1131                                      int_formats, consts->MaxSamples,
1132                                      PIPE_BIND_SAMPLER_VIEW);
1133
1134       /* ARB_framebuffer_no_attachments, assume max no. of samples 32 */
1135       consts->MaxFramebufferSamples =
1136          get_max_samples_for_formats(screen, ARRAY_SIZE(void_formats),
1137                                      void_formats, 32,
1138                                      PIPE_BIND_RENDER_TARGET);
1139
1140       if (extensions->AMD_framebuffer_multisample_advanced) {
1141          /* AMD_framebuffer_multisample_advanced */
1142          /* This can be greater than storage samples. */
1143          consts->MaxColorFramebufferSamples =
1144             get_max_samples_for_formats_advanced(screen,
1145                                                 ARRAY_SIZE(color_formats),
1146                                                 color_formats, 16,
1147                                                 consts->MaxSamples,
1148                                                 PIPE_BIND_RENDER_TARGET);
1149
1150          /* If the driver supports N color samples, it means it supports
1151           * N samples and N storage samples. N samples >= N storage
1152           * samples.
1153           */
1154          consts->MaxColorFramebufferStorageSamples = consts->MaxSamples;
1155          consts->MaxDepthStencilFramebufferSamples =
1156             consts->MaxDepthTextureSamples;
1157
1158          assert(consts->MaxColorFramebufferSamples >=
1159                 consts->MaxDepthStencilFramebufferSamples);
1160          assert(consts->MaxDepthStencilFramebufferSamples >=
1161                 consts->MaxColorFramebufferStorageSamples);
1162
1163          consts->NumSupportedMultisampleModes = 0;
1164
1165          unsigned depth_samples_supported = 0;
1166
1167          for (unsigned samples = 2;
1168               samples <= consts->MaxDepthStencilFramebufferSamples;
1169               samples++) {
1170             if (screen->is_format_supported(screen, PIPE_FORMAT_Z32_FLOAT,
1171                                             PIPE_TEXTURE_2D, samples, samples,
1172                                             PIPE_BIND_DEPTH_STENCIL))
1173                depth_samples_supported |= 1 << samples;
1174          }
1175
1176          for (unsigned samples = 2;
1177               samples <= consts->MaxColorFramebufferSamples;
1178               samples++) {
1179             for (unsigned depth_samples = 2;
1180                  depth_samples <= samples; depth_samples++) {
1181                if (!(depth_samples_supported & (1 << depth_samples)))
1182                   continue;
1183
1184                for (unsigned storage_samples = 2;
1185                     storage_samples <= depth_samples; storage_samples++) {
1186                   if (screen->is_format_supported(screen,
1187                                                   PIPE_FORMAT_R8G8B8A8_UNORM,
1188                                                   PIPE_TEXTURE_2D,
1189                                                   samples,
1190                                                   storage_samples,
1191                                                   PIPE_BIND_RENDER_TARGET)) {
1192                      unsigned i = consts->NumSupportedMultisampleModes;
1193
1194                      assert(i < ARRAY_SIZE(consts->SupportedMultisampleModes));
1195                      consts->SupportedMultisampleModes[i].NumColorSamples =
1196                         samples;
1197                      consts->SupportedMultisampleModes[i].NumColorStorageSamples =
1198                         storage_samples;
1199                      consts->SupportedMultisampleModes[i].NumDepthStencilSamples =
1200                         depth_samples;
1201                      consts->NumSupportedMultisampleModes++;
1202                   }
1203                }
1204             }
1205          }
1206       }
1207    }
1208
1209    if (consts->MaxSamples >= 2) {
1210       /* Real MSAA support */
1211       extensions->EXT_framebuffer_multisample = GL_TRUE;
1212       extensions->EXT_framebuffer_multisample_blit_scaled = GL_TRUE;
1213    }
1214    else if (consts->MaxSamples > 0 &&
1215             screen->get_param(screen, PIPE_CAP_FAKE_SW_MSAA)) {
1216       /* fake MSAA support */
1217       consts->FakeSWMSAA = GL_TRUE;
1218       extensions->EXT_framebuffer_multisample = GL_TRUE;
1219       extensions->EXT_framebuffer_multisample_blit_scaled = GL_TRUE;
1220       extensions->ARB_texture_multisample = GL_TRUE;
1221    }
1222
1223    if (consts->MaxDualSourceDrawBuffers > 0 &&
1224        !options->disable_blend_func_extended)
1225       extensions->ARB_blend_func_extended = GL_TRUE;
1226
1227    if (screen->get_param(screen, PIPE_CAP_QUERY_TIME_ELAPSED) ||
1228        extensions->ARB_timer_query) {
1229       extensions->EXT_timer_query = GL_TRUE;
1230    }
1231
1232    if (extensions->ARB_transform_feedback2 &&
1233        extensions->ARB_draw_instanced) {
1234       extensions->ARB_transform_feedback_instanced = GL_TRUE;
1235    }
1236    if (options->force_glsl_extensions_warn)
1237       consts->ForceGLSLExtensionsWarn = 1;
1238
1239    if (options->disable_glsl_line_continuations)
1240       consts->DisableGLSLLineContinuations = 1;
1241
1242    if (options->allow_glsl_extension_directive_midshader)
1243       consts->AllowGLSLExtensionDirectiveMidShader = GL_TRUE;
1244
1245    if (options->allow_glsl_builtin_const_expression)
1246       consts->AllowGLSLBuiltinConstantExpression = GL_TRUE;
1247
1248    if (options->allow_glsl_relaxed_es)
1249       consts->AllowGLSLRelaxedES = GL_TRUE;
1250
1251    consts->MinMapBufferAlignment =
1252       screen->get_param(screen, PIPE_CAP_MIN_MAP_BUFFER_ALIGNMENT);
1253
1254    /* The OpenGL Compatibility profile requires arbitrary buffer swizzling. */
1255    if (api == API_OPENGL_COMPAT &&
1256        screen->get_param(screen, PIPE_CAP_BUFFER_SAMPLER_VIEW_RGBA_ONLY))
1257       extensions->ARB_texture_buffer_object = GL_FALSE;
1258
1259    if (extensions->ARB_texture_buffer_object) {
1260       consts->MaxTextureBufferSize =
1261          _min(screen->get_param(screen, PIPE_CAP_MAX_TEXTURE_BUFFER_SIZE),
1262               (1u << 31) - 1);
1263       consts->TextureBufferOffsetAlignment =
1264          screen->get_param(screen, PIPE_CAP_TEXTURE_BUFFER_OFFSET_ALIGNMENT);
1265
1266       if (consts->TextureBufferOffsetAlignment)
1267          extensions->ARB_texture_buffer_range = GL_TRUE;
1268
1269       init_format_extensions(screen, extensions, tbo_rgb32,
1270                              ARRAY_SIZE(tbo_rgb32), PIPE_BUFFER,
1271                              PIPE_BIND_SAMPLER_VIEW);
1272    }
1273
1274    extensions->OES_texture_buffer =
1275       extensions->ARB_texture_buffer_object &&
1276       extensions->ARB_texture_buffer_range &&
1277       extensions->ARB_texture_buffer_object_rgb32 &&
1278       extensions->ARB_shader_image_load_store;
1279
1280    /* Unpacking a varying in the fragment shader costs 1 texture indirection.
1281     * If the number of available texture indirections is very limited, then we
1282     * prefer to disable varying packing rather than run the risk of varying
1283     * packing preventing a shader from running.
1284     */
1285    if (screen->get_shader_param(screen, PIPE_SHADER_FRAGMENT,
1286                                 PIPE_SHADER_CAP_MAX_TEX_INDIRECTIONS) <= 8) {
1287       /* We can't disable varying packing if transform feedback is available,
1288        * because transform feedback code assumes a packed varying layout.
1289        */
1290       if (!extensions->EXT_transform_feedback)
1291          consts->DisableVaryingPacking = GL_TRUE;
1292    }
1293
1294    consts->MaxViewports = screen->get_param(screen, PIPE_CAP_MAX_VIEWPORTS);
1295    if (consts->MaxViewports >= 16) {
1296       if (GLSLVersion >= 400) {
1297          consts->ViewportBounds.Min = -32768.0;
1298          consts->ViewportBounds.Max = 32767.0;
1299       } else {
1300          consts->ViewportBounds.Min = -16384.0;
1301          consts->ViewportBounds.Max = 16383.0;
1302       }
1303       extensions->ARB_viewport_array = GL_TRUE;
1304       extensions->ARB_fragment_layer_viewport = GL_TRUE;
1305       if (extensions->AMD_vertex_shader_layer)
1306          extensions->AMD_vertex_shader_viewport_index = GL_TRUE;
1307    }
1308
1309    if (extensions->AMD_vertex_shader_layer &&
1310        extensions->AMD_vertex_shader_viewport_index &&
1311        screen->get_param(screen, PIPE_CAP_TGSI_TES_LAYER_VIEWPORT))
1312       extensions->ARB_shader_viewport_layer_array = GL_TRUE;
1313
1314    /* ARB_framebuffer_no_attachments */
1315    if (screen->get_param(screen, PIPE_CAP_FRAMEBUFFER_NO_ATTACHMENT) &&
1316        ((consts->MaxSamples >= 4 && consts->MaxFramebufferLayers >= 2048) ||
1317         (consts->MaxFramebufferSamples >= consts->MaxSamples &&
1318          consts->MaxFramebufferLayers >= consts->MaxArrayTextureLayers)))
1319       extensions->ARB_framebuffer_no_attachments = GL_TRUE;
1320
1321    /* GL_ARB_ES3_compatibility.
1322     * Check requirements for GLSL ES 3.00.
1323     */
1324    if (GLSLVersion >= 130 &&
1325        extensions->ARB_uniform_buffer_object &&
1326        extensions->ARB_shader_bit_encoding &&
1327        extensions->NV_primitive_restart &&
1328        screen->get_shader_param(screen, PIPE_SHADER_VERTEX,
1329                                 PIPE_SHADER_CAP_MAX_TEXTURE_SAMPLERS) >= 16 &&
1330        /* Requirements for ETC2 emulation. */
1331        screen->is_format_supported(screen, PIPE_FORMAT_R8G8B8A8_UNORM,
1332                                    PIPE_TEXTURE_2D, 0, 0,
1333                                    PIPE_BIND_SAMPLER_VIEW) &&
1334        screen->is_format_supported(screen, PIPE_FORMAT_R8G8B8A8_SRGB,
1335                                    PIPE_TEXTURE_2D, 0, 0,
1336                                    PIPE_BIND_SAMPLER_VIEW) &&
1337        screen->is_format_supported(screen, PIPE_FORMAT_R16_UNORM,
1338                                    PIPE_TEXTURE_2D, 0, 0,
1339                                    PIPE_BIND_SAMPLER_VIEW) &&
1340        screen->is_format_supported(screen, PIPE_FORMAT_R16G16_UNORM,
1341                                    PIPE_TEXTURE_2D, 0, 0,
1342                                    PIPE_BIND_SAMPLER_VIEW) &&
1343        screen->is_format_supported(screen, PIPE_FORMAT_R16_SNORM,
1344                                    PIPE_TEXTURE_2D, 0, 0,
1345                                    PIPE_BIND_SAMPLER_VIEW) &&
1346        screen->is_format_supported(screen, PIPE_FORMAT_R16G16_SNORM,
1347                                    PIPE_TEXTURE_2D, 0, 0,
1348                                    PIPE_BIND_SAMPLER_VIEW)) {
1349       extensions->ARB_ES3_compatibility = GL_TRUE;
1350    }
1351
1352 #ifdef HAVE_ST_VDPAU
1353    if (screen->get_video_param &&
1354        screen->get_video_param(screen, PIPE_VIDEO_PROFILE_UNKNOWN,
1355                                PIPE_VIDEO_ENTRYPOINT_BITSTREAM,
1356                                PIPE_VIDEO_CAP_SUPPORTS_INTERLACED)) {
1357       extensions->NV_vdpau_interop = GL_TRUE;
1358    }
1359 #endif
1360
1361    if (screen->get_param(screen, PIPE_CAP_DOUBLES)) {
1362       extensions->ARB_gpu_shader_fp64 = GL_TRUE;
1363       extensions->ARB_vertex_attrib_64bit = GL_TRUE;
1364    }
1365
1366    if ((ST_DEBUG & DEBUG_GREMEDY) &&
1367        screen->get_param(screen, PIPE_CAP_STRING_MARKER))
1368       extensions->GREMEDY_string_marker = GL_TRUE;
1369
1370    if (screen->get_param(screen, PIPE_CAP_COMPUTE)) {
1371       int compute_supported_irs =
1372          screen->get_shader_param(screen, PIPE_SHADER_COMPUTE,
1373                                   PIPE_SHADER_CAP_SUPPORTED_IRS);
1374       if (compute_supported_irs & (1 << PIPE_SHADER_IR_TGSI)) {
1375          uint64_t grid_size[3], block_size[3];
1376          uint64_t max_local_size, max_threads_per_block;
1377
1378          screen->get_compute_param(screen, PIPE_SHADER_IR_TGSI,
1379                                    PIPE_COMPUTE_CAP_MAX_GRID_SIZE, grid_size);
1380          screen->get_compute_param(screen, PIPE_SHADER_IR_TGSI,
1381                                    PIPE_COMPUTE_CAP_MAX_BLOCK_SIZE, block_size);
1382          screen->get_compute_param(screen, PIPE_SHADER_IR_TGSI,
1383                                    PIPE_COMPUTE_CAP_MAX_THREADS_PER_BLOCK,
1384                                    &max_threads_per_block);
1385          screen->get_compute_param(screen, PIPE_SHADER_IR_TGSI,
1386                                    PIPE_COMPUTE_CAP_MAX_LOCAL_SIZE,
1387                                    &max_local_size);
1388
1389          consts->MaxComputeWorkGroupInvocations = max_threads_per_block;
1390          consts->MaxComputeSharedMemorySize = max_local_size;
1391
1392          for (i = 0; i < 3; i++) {
1393             consts->MaxComputeWorkGroupCount[i] = grid_size[i];
1394             consts->MaxComputeWorkGroupSize[i] = block_size[i];
1395          }
1396
1397          extensions->ARB_compute_shader =
1398                                       extensions->ARB_shader_image_load_store &&
1399                                       extensions->ARB_shader_atomic_counters;
1400
1401          if (extensions->ARB_compute_shader) {
1402             uint64_t max_variable_threads_per_block = 0;
1403
1404             screen->get_compute_param(screen, PIPE_SHADER_IR_TGSI,
1405                                       PIPE_COMPUTE_CAP_MAX_VARIABLE_THREADS_PER_BLOCK,
1406                                       &max_variable_threads_per_block);
1407
1408             for (i = 0; i < 3; i++) {
1409                /* Clamp the values to avoid having a local work group size
1410                 * greater than the maximum number of invocations.
1411                 */
1412                consts->MaxComputeVariableGroupSize[i] =
1413                   MIN2(consts->MaxComputeWorkGroupSize[i],
1414                        max_variable_threads_per_block);
1415             }
1416             consts->MaxComputeVariableGroupInvocations =
1417                max_variable_threads_per_block;
1418
1419             extensions->ARB_compute_variable_group_size =
1420                max_variable_threads_per_block > 0;
1421          }
1422       }
1423    }
1424
1425    if (extensions->EXT_texture_filter_anisotropic &&
1426        screen->get_paramf(screen, PIPE_CAPF_MAX_TEXTURE_ANISOTROPY) >= 16.0)
1427       extensions->ARB_texture_filter_anisotropic = GL_TRUE;
1428
1429    extensions->KHR_robustness = extensions->ARB_robust_buffer_access_behavior;
1430
1431    /* If we support ES 3.1, we support the ES3_1_compatibility ext. However
1432     * there's no clean way of telling whether we would support ES 3.1 from
1433     * here, so copy the condition from compute_version_es2 here. A lot of
1434     * these are redunant, but simpler to just have a (near-)exact copy here.
1435     */
1436    extensions->ARB_ES3_1_compatibility =
1437       extensions->ARB_ES3_compatibility &&
1438       extensions->ARB_arrays_of_arrays &&
1439       extensions->ARB_compute_shader &&
1440       extensions->ARB_draw_indirect &&
1441       extensions->ARB_explicit_uniform_location &&
1442       extensions->ARB_framebuffer_no_attachments &&
1443       extensions->ARB_shader_atomic_counters &&
1444       extensions->ARB_shader_image_load_store &&
1445       extensions->ARB_shader_image_size &&
1446       extensions->ARB_shader_storage_buffer_object &&
1447       extensions->ARB_shading_language_packing &&
1448       extensions->ARB_stencil_texturing &&
1449       extensions->ARB_texture_multisample &&
1450       extensions->ARB_gpu_shader5 &&
1451       extensions->EXT_shader_integer_mix;
1452
1453    extensions->OES_texture_cube_map_array =
1454       extensions->ARB_ES3_1_compatibility &&
1455       extensions->OES_geometry_shader &&
1456       extensions->ARB_texture_cube_map_array;
1457
1458    extensions->OES_viewport_array =
1459       extensions->ARB_ES3_1_compatibility &&
1460       extensions->OES_geometry_shader &&
1461       extensions->ARB_viewport_array;
1462
1463    extensions->OES_primitive_bounding_box = extensions->ARB_ES3_1_compatibility;
1464    consts->NoPrimitiveBoundingBoxOutput = true;
1465
1466    extensions->ANDROID_extension_pack_es31a =
1467       extensions->KHR_texture_compression_astc_ldr &&
1468       extensions->KHR_blend_equation_advanced &&
1469       extensions->OES_sample_variables &&
1470       extensions->ARB_shader_image_load_store &&
1471       extensions->ARB_texture_stencil8 &&
1472       extensions->ARB_texture_multisample &&
1473       extensions->OES_copy_image &&
1474       extensions->ARB_draw_buffers_blend &&
1475       extensions->OES_geometry_shader &&
1476       extensions->ARB_gpu_shader5 &&
1477       extensions->OES_primitive_bounding_box &&
1478       extensions->ARB_tessellation_shader &&
1479       extensions->ARB_texture_border_clamp &&
1480       extensions->OES_texture_buffer &&
1481       extensions->OES_texture_cube_map_array &&
1482       extensions->EXT_texture_sRGB_decode;
1483
1484    /* Same deal as for ARB_ES3_1_compatibility - this has to be computed
1485     * before overall versions are selected. Also it's actually a subset of ES
1486     * 3.2, since it doesn't require ASTC or advanced blending.
1487     */
1488    extensions->ARB_ES3_2_compatibility =
1489       extensions->ARB_ES3_1_compatibility &&
1490       extensions->KHR_robustness &&
1491       extensions->ARB_copy_image &&
1492       extensions->ARB_draw_buffers_blend &&
1493       extensions->ARB_draw_elements_base_vertex &&
1494       extensions->OES_geometry_shader &&
1495       extensions->ARB_gpu_shader5 &&
1496       extensions->ARB_sample_shading &&
1497       extensions->ARB_tessellation_shader &&
1498       extensions->ARB_texture_border_clamp &&
1499       extensions->OES_texture_buffer &&
1500       extensions->ARB_texture_cube_map_array &&
1501       extensions->ARB_texture_stencil8 &&
1502       extensions->ARB_texture_multisample;
1503
1504    if (screen->get_param(screen, PIPE_CAP_CONSERVATIVE_RASTER_POST_SNAP_TRIANGLES) &&
1505        screen->get_param(screen, PIPE_CAP_CONSERVATIVE_RASTER_POST_SNAP_POINTS_LINES) &&
1506        screen->get_param(screen, PIPE_CAP_CONSERVATIVE_RASTER_POST_DEPTH_COVERAGE)) {
1507       float max_dilate;
1508       bool pre_snap_triangles, pre_snap_points_lines;
1509
1510       max_dilate = screen->get_paramf(screen, PIPE_CAPF_MAX_CONSERVATIVE_RASTER_DILATE);
1511
1512       pre_snap_triangles =
1513          screen->get_param(screen, PIPE_CAP_CONSERVATIVE_RASTER_PRE_SNAP_TRIANGLES);
1514       pre_snap_points_lines =
1515          screen->get_param(screen, PIPE_CAP_CONSERVATIVE_RASTER_PRE_SNAP_POINTS_LINES);
1516
1517       extensions->NV_conservative_raster =
1518          screen->get_param(screen, PIPE_CAP_MAX_CONSERVATIVE_RASTER_SUBPIXEL_PRECISION_BIAS) > 1;
1519
1520       if (extensions->NV_conservative_raster) {
1521          extensions->NV_conservative_raster_dilate = max_dilate >= 0.75;
1522          extensions->NV_conservative_raster_pre_snap_triangles = pre_snap_triangles;
1523          extensions->NV_conservative_raster_pre_snap =
1524             pre_snap_triangles && pre_snap_points_lines;
1525       }
1526    }
1527 }