src/mesa/drivers/dri/i965/brw_shader.cpp

   1 /*
   2  * Copyright © 2010 Intel Corporation
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice (including the next
  12  * paragraph) shall be included in all copies or substantial portions of the
  13  * Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  21  * IN THE SOFTWARE.
  22  */
  23
  24 #include "main/macros.h"
  25 #include "brw_context.h"
  26 #include "brw_vs.h"
  27 #include "brw_gs.h"
  28 #include "brw_fs.h"
  29 #include "brw_cfg.h"
  30 #include "brw_nir.h"
  31 #include "glsl/ir_optimization.h"
  32 #include "glsl/glsl_parser_extras.h"
  33 #include "main/shaderapi.h"
  34
  35 static void
  36 shader_debug_log_mesa(void *data, const char *fmt, ...)
  37 {
  38    struct brw_context *brw = (struct brw_context *)data;
  39    va_list args;
  40
  41    va_start(args, fmt);
  42    GLuint msg_id = 0;
  43    _mesa_gl_vdebug(&brw->ctx, &msg_id,
  44                    MESA_DEBUG_SOURCE_SHADER_COMPILER,
  45                    MESA_DEBUG_TYPE_OTHER,
  46                    MESA_DEBUG_SEVERITY_NOTIFICATION, fmt, args);
  47    va_end(args);
  48 }
  49
  50 static void
  51 shader_perf_log_mesa(void *data, const char *fmt, ...)
  52 {
  53    struct brw_context *brw = (struct brw_context *)data;
  54
  55    va_list args;
  56    va_start(args, fmt);
  57
  58    if (unlikely(INTEL_DEBUG & DEBUG_PERF)) {
  59       va_list args_copy;
  60       va_copy(args_copy, args);
  61       vfprintf(stderr, fmt, args_copy);
  62       va_end(args_copy);
  63    }
  64
  65    if (brw->perf_debug) {
  66       GLuint msg_id = 0;
  67       _mesa_gl_vdebug(&brw->ctx, &msg_id,
  68                       MESA_DEBUG_SOURCE_SHADER_COMPILER,
  69                       MESA_DEBUG_TYPE_PERFORMANCE,
  70                       MESA_DEBUG_SEVERITY_MEDIUM, fmt, args);
  71    }
  72    va_end(args);
  73 }
  74
  75 bool
  76 is_scalar_shader_stage(const struct brw_compiler *compiler, int stage)
  77 {
  78    switch (stage) {
  79    case MESA_SHADER_FRAGMENT:
  80    case MESA_SHADER_COMPUTE:
  81       return true;
  82    case MESA_SHADER_GEOMETRY:
  83       return compiler->scalar_gs;
  84    case MESA_SHADER_VERTEX:
  85       return compiler->scalar_vs;
  86    default:
  87       return false;
  88    }
  89 }
  90
  91 struct brw_compiler *
  92 brw_compiler_create(void *mem_ctx, const struct brw_device_info *devinfo)
  93 {
  94    struct brw_compiler *compiler = rzalloc(mem_ctx, struct brw_compiler);
  95
  96    compiler->devinfo = devinfo;
  97    compiler->shader_debug_log = shader_debug_log_mesa;
  98    compiler->shader_perf_log = shader_perf_log_mesa;
  99
 100    brw_fs_alloc_reg_sets(compiler);
 101    brw_vec4_alloc_reg_set(compiler);
 102
 103    if (devinfo->gen >= 8 && !(INTEL_DEBUG & DEBUG_VEC4VS))
 104       compiler->scalar_vs = true;
 105
 106    if (devinfo->gen >= 8 && brw_env_var_as_boolean("INTEL_SCALAR_GS", false))
 107       compiler->scalar_gs = true;
 108
 109    nir_shader_compiler_options *nir_options =
 110       rzalloc(compiler, nir_shader_compiler_options);
 111    nir_options->native_integers = true;
 112    /* In order to help allow for better CSE at the NIR level we tell NIR
 113     * to split all ffma instructions during opt_algebraic and we then
 114     * re-combine them as a later step.
 115     */
 116    nir_options->lower_ffma = true;
 117    nir_options->lower_sub = true;
 118    /* In the vec4 backend, our dpN instruction replicates its result to all
 119     * the components of a vec4.  We would like NIR to give us replicated fdot
 120     * instructions because it can optimize better for us.
 121     *
 122     * For the FS backend, it should be lowered away by the scalarizing pass so
 123     * we should never see fdot anyway.
 124     */
 125    nir_options->fdot_replicates = true;
 126
 127    /* We want the GLSL compiler to emit code that uses condition codes */
 128    for (int i = 0; i < MESA_SHADER_STAGES; i++) {
 129       compiler->glsl_compiler_options[i].MaxUnrollIterations = 32;
 130       compiler->glsl_compiler_options[i].MaxIfDepth =
 131          devinfo->gen < 6 ? 16 : UINT_MAX;
 132
 133       compiler->glsl_compiler_options[i].EmitCondCodes = true;
 134       compiler->glsl_compiler_options[i].EmitNoNoise = true;
 135       compiler->glsl_compiler_options[i].EmitNoMainReturn = true;
 136       compiler->glsl_compiler_options[i].EmitNoIndirectInput = true;
 137       compiler->glsl_compiler_options[i].EmitNoIndirectUniform = false;
 138       compiler->glsl_compiler_options[i].LowerClipDistance = true;
 139
 140       bool is_scalar = is_scalar_shader_stage(compiler, i);
 141
 142       compiler->glsl_compiler_options[i].EmitNoIndirectOutput = is_scalar;
 143       compiler->glsl_compiler_options[i].EmitNoIndirectTemp = is_scalar;
 144       compiler->glsl_compiler_options[i].OptimizeForAOS = !is_scalar;
 145
 146       /* !ARB_gpu_shader5 */
 147       if (devinfo->gen < 7)
 148          compiler->glsl_compiler_options[i].EmitNoIndirectSampler = true;
 149
 150       compiler->glsl_compiler_options[i].NirOptions = nir_options;
 151
 152       compiler->glsl_compiler_options[i].LowerBufferInterfaceBlocks = true;
 153    }
 154
 155    return compiler;
 156 }
 157
 158 struct gl_shader *
 159 brw_new_shader(struct gl_context *ctx, GLuint name, GLuint type)
 160 {
 161    struct brw_shader *shader;
 162
 163    shader = rzalloc(NULL, struct brw_shader);
 164    if (shader) {
 165       shader->base.Type = type;
 166       shader->base.Stage = _mesa_shader_enum_to_shader_stage(type);
 167       shader->base.Name = name;
 168       _mesa_init_shader(ctx, &shader->base);
 169    }
 170
 171    return &shader->base;
 172 }
 173
 174 void
 175 brw_mark_surface_used(struct brw_stage_prog_data *prog_data,
 176                       unsigned surf_index)
 177 {
 178    assert(surf_index < BRW_MAX_SURFACES);
 179
 180    prog_data->binding_table.size_bytes =
 181       MAX2(prog_data->binding_table.size_bytes, (surf_index + 1) * 4);
 182 }
 183
 184 enum brw_reg_type
 185 brw_type_for_base_type(const struct glsl_type *type)
 186 {
 187    switch (type->base_type) {
 188    case GLSL_TYPE_FLOAT:
 189       return BRW_REGISTER_TYPE_F;
 190    case GLSL_TYPE_INT:
 191    case GLSL_TYPE_BOOL:
 192    case GLSL_TYPE_SUBROUTINE:
 193       return BRW_REGISTER_TYPE_D;
 194    case GLSL_TYPE_UINT:
 195       return BRW_REGISTER_TYPE_UD;
 196    case GLSL_TYPE_ARRAY:
 197       return brw_type_for_base_type(type->fields.array);
 198    case GLSL_TYPE_STRUCT:
 199    case GLSL_TYPE_SAMPLER:
 200    case GLSL_TYPE_ATOMIC_UINT:
 201       /* These should be overridden with the type of the member when
 202        * dereferenced into.  BRW_REGISTER_TYPE_UD seems like a likely
 203        * way to trip up if we don't.
 204        */
 205       return BRW_REGISTER_TYPE_UD;
 206    case GLSL_TYPE_IMAGE:
 207       return BRW_REGISTER_TYPE_UD;
 208    case GLSL_TYPE_VOID:
 209    case GLSL_TYPE_ERROR:
 210    case GLSL_TYPE_INTERFACE:
 211    case GLSL_TYPE_DOUBLE:
 212       unreachable("not reached");
 213    }
 214
 215    return BRW_REGISTER_TYPE_F;
 216 }
 217
 218 enum brw_conditional_mod
 219 brw_conditional_for_comparison(unsigned int op)
 220 {
 221    switch (op) {
 222    case ir_binop_less:
 223       return BRW_CONDITIONAL_L;
 224    case ir_binop_greater:
 225       return BRW_CONDITIONAL_G;
 226    case ir_binop_lequal:
 227       return BRW_CONDITIONAL_LE;
 228    case ir_binop_gequal:
 229       return BRW_CONDITIONAL_GE;
 230    case ir_binop_equal:
 231    case ir_binop_all_equal: /* same as equal for scalars */
 232       return BRW_CONDITIONAL_Z;
 233    case ir_binop_nequal:
 234    case ir_binop_any_nequal: /* same as nequal for scalars */
 235       return BRW_CONDITIONAL_NZ;
 236    default:
 237       unreachable("not reached: bad operation for comparison");
 238    }
 239 }
 240
 241 uint32_t
 242 brw_math_function(enum opcode op)
 243 {
 244    switch (op) {
 245    case SHADER_OPCODE_RCP:
 246       return BRW_MATH_FUNCTION_INV;
 247    case SHADER_OPCODE_RSQ:
 248       return BRW_MATH_FUNCTION_RSQ;
 249    case SHADER_OPCODE_SQRT:
 250       return BRW_MATH_FUNCTION_SQRT;
 251    case SHADER_OPCODE_EXP2:
 252       return BRW_MATH_FUNCTION_EXP;
 253    case SHADER_OPCODE_LOG2:
 254       return BRW_MATH_FUNCTION_LOG;
 255    case SHADER_OPCODE_POW:
 256       return BRW_MATH_FUNCTION_POW;
 257    case SHADER_OPCODE_SIN:
 258       return BRW_MATH_FUNCTION_SIN;
 259    case SHADER_OPCODE_COS:
 260       return BRW_MATH_FUNCTION_COS;
 261    case SHADER_OPCODE_INT_QUOTIENT:
 262       return BRW_MATH_FUNCTION_INT_DIV_QUOTIENT;
 263    case SHADER_OPCODE_INT_REMAINDER:
 264       return BRW_MATH_FUNCTION_INT_DIV_REMAINDER;
 265    default:
 266       unreachable("not reached: unknown math function");
 267    }
 268 }
 269
 270 uint32_t
 271 brw_texture_offset(int *offsets, unsigned num_components)
 272 {
 273    if (!offsets) return 0;  /* nonconstant offset; caller will handle it. */
 274
 275    /* Combine all three offsets into a single unsigned dword:
 276     *
 277     *    bits 11:8 - U Offset (X component)
 278     *    bits  7:4 - V Offset (Y component)
 279     *    bits  3:0 - R Offset (Z component)
 280     */
 281    unsigned offset_bits = 0;
 282    for (unsigned i = 0; i < num_components; i++) {
 283       const unsigned shift = 4 * (2 - i);
 284       offset_bits |= (offsets[i] << shift) & (0xF << shift);
 285    }
 286    return offset_bits;
 287 }
 288
 289 const char *
 290 brw_instruction_name(enum opcode op)
 291 {
 292    switch (op) {
 293    case BRW_OPCODE_ILLEGAL ... BRW_OPCODE_NOP:
 294       assert(opcode_descs[op].name);
 295       return opcode_descs[op].name;
 296    case FS_OPCODE_FB_WRITE:
 297       return "fb_write";
 298    case FS_OPCODE_FB_WRITE_LOGICAL:
 299       return "fb_write_logical";
 300    case FS_OPCODE_PACK_STENCIL_REF:
 301       return "pack_stencil_ref";
 302    case FS_OPCODE_BLORP_FB_WRITE:
 303       return "blorp_fb_write";
 304    case FS_OPCODE_REP_FB_WRITE:
 305       return "rep_fb_write";
 306
 307    case SHADER_OPCODE_RCP:
 308       return "rcp";
 309    case SHADER_OPCODE_RSQ:
 310       return "rsq";
 311    case SHADER_OPCODE_SQRT:
 312       return "sqrt";
 313    case SHADER_OPCODE_EXP2:
 314       return "exp2";
 315    case SHADER_OPCODE_LOG2:
 316       return "log2";
 317    case SHADER_OPCODE_POW:
 318       return "pow";
 319    case SHADER_OPCODE_INT_QUOTIENT:
 320       return "int_quot";
 321    case SHADER_OPCODE_INT_REMAINDER:
 322       return "int_rem";
 323    case SHADER_OPCODE_SIN:
 324       return "sin";
 325    case SHADER_OPCODE_COS:
 326       return "cos";
 327
 328    case SHADER_OPCODE_TEX:
 329       return "tex";
 330    case SHADER_OPCODE_TEX_LOGICAL:
 331       return "tex_logical";
 332    case SHADER_OPCODE_TXD:
 333       return "txd";
 334    case SHADER_OPCODE_TXD_LOGICAL:
 335       return "txd_logical";
 336    case SHADER_OPCODE_TXF:
 337       return "txf";
 338    case SHADER_OPCODE_TXF_LOGICAL:
 339       return "txf_logical";
 340    case SHADER_OPCODE_TXL:
 341       return "txl";
 342    case SHADER_OPCODE_TXL_LOGICAL:
 343       return "txl_logical";
 344    case SHADER_OPCODE_TXS:
 345       return "txs";
 346    case SHADER_OPCODE_TXS_LOGICAL:
 347       return "txs_logical";
 348    case FS_OPCODE_TXB:
 349       return "txb";
 350    case FS_OPCODE_TXB_LOGICAL:
 351       return "txb_logical";
 352    case SHADER_OPCODE_TXF_CMS:
 353       return "txf_cms";
 354    case SHADER_OPCODE_TXF_CMS_LOGICAL:
 355       return "txf_cms_logical";
 356    case SHADER_OPCODE_TXF_CMS_W:
 357       return "txf_cms_w";
 358    case SHADER_OPCODE_TXF_CMS_W_LOGICAL:
 359       return "txf_cms_w_logical";
 360    case SHADER_OPCODE_TXF_UMS:
 361       return "txf_ums";
 362    case SHADER_OPCODE_TXF_UMS_LOGICAL:
 363       return "txf_ums_logical";
 364    case SHADER_OPCODE_TXF_MCS:
 365       return "txf_mcs";
 366    case SHADER_OPCODE_TXF_MCS_LOGICAL:
 367       return "txf_mcs_logical";
 368    case SHADER_OPCODE_LOD:
 369       return "lod";
 370    case SHADER_OPCODE_LOD_LOGICAL:
 371       return "lod_logical";
 372    case SHADER_OPCODE_TG4:
 373       return "tg4";
 374    case SHADER_OPCODE_TG4_LOGICAL:
 375       return "tg4_logical";
 376    case SHADER_OPCODE_TG4_OFFSET:
 377       return "tg4_offset";
 378    case SHADER_OPCODE_TG4_OFFSET_LOGICAL:
 379       return "tg4_offset_logical";
 380    case SHADER_OPCODE_SAMPLEINFO:
 381       return "sampleinfo";
 382
 383    case SHADER_OPCODE_SHADER_TIME_ADD:
 384       return "shader_time_add";
 385
 386    case SHADER_OPCODE_UNTYPED_ATOMIC:
 387       return "untyped_atomic";
 388    case SHADER_OPCODE_UNTYPED_ATOMIC_LOGICAL:
 389       return "untyped_atomic_logical";
 390    case SHADER_OPCODE_UNTYPED_SURFACE_READ:
 391       return "untyped_surface_read";
 392    case SHADER_OPCODE_UNTYPED_SURFACE_READ_LOGICAL:
 393       return "untyped_surface_read_logical";
 394    case SHADER_OPCODE_UNTYPED_SURFACE_WRITE:
 395       return "untyped_surface_write";
 396    case SHADER_OPCODE_UNTYPED_SURFACE_WRITE_LOGICAL:
 397       return "untyped_surface_write_logical";
 398    case SHADER_OPCODE_TYPED_ATOMIC:
 399       return "typed_atomic";
 400    case SHADER_OPCODE_TYPED_ATOMIC_LOGICAL:
 401       return "typed_atomic_logical";
 402    case SHADER_OPCODE_TYPED_SURFACE_READ:
 403       return "typed_surface_read";
 404    case SHADER_OPCODE_TYPED_SURFACE_READ_LOGICAL:
 405       return "typed_surface_read_logical";
 406    case SHADER_OPCODE_TYPED_SURFACE_WRITE:
 407       return "typed_surface_write";
 408    case SHADER_OPCODE_TYPED_SURFACE_WRITE_LOGICAL:
 409       return "typed_surface_write_logical";
 410    case SHADER_OPCODE_MEMORY_FENCE:
 411       return "memory_fence";
 412
 413    case SHADER_OPCODE_LOAD_PAYLOAD:
 414       return "load_payload";
 415
 416    case SHADER_OPCODE_GEN4_SCRATCH_READ:
 417       return "gen4_scratch_read";
 418    case SHADER_OPCODE_GEN4_SCRATCH_WRITE:
 419       return "gen4_scratch_write";
 420    case SHADER_OPCODE_GEN7_SCRATCH_READ:
 421       return "gen7_scratch_read";
 422    case SHADER_OPCODE_URB_WRITE_SIMD8:
 423       return "gen8_urb_write_simd8";
 424    case SHADER_OPCODE_URB_WRITE_SIMD8_PER_SLOT:
 425       return "gen8_urb_write_simd8_per_slot";
 426    case SHADER_OPCODE_URB_WRITE_SIMD8_MASKED:
 427       return "gen8_urb_write_simd8_masked";
 428    case SHADER_OPCODE_URB_WRITE_SIMD8_MASKED_PER_SLOT:
 429       return "gen8_urb_write_simd8_masked_per_slot";
 430    case SHADER_OPCODE_URB_READ_SIMD8:
 431       return "urb_read_simd8";
 432    case SHADER_OPCODE_URB_READ_SIMD8_PER_SLOT:
 433       return "urb_read_simd8_per_slot";
 434
 435    case SHADER_OPCODE_FIND_LIVE_CHANNEL:
 436       return "find_live_channel";
 437    case SHADER_OPCODE_BROADCAST:
 438       return "broadcast";
 439
 440    case VEC4_OPCODE_MOV_BYTES:
 441       return "mov_bytes";
 442    case VEC4_OPCODE_PACK_BYTES:
 443       return "pack_bytes";
 444    case VEC4_OPCODE_UNPACK_UNIFORM:
 445       return "unpack_uniform";
 446
 447    case FS_OPCODE_DDX_COARSE:
 448       return "ddx_coarse";
 449    case FS_OPCODE_DDX_FINE:
 450       return "ddx_fine";
 451    case FS_OPCODE_DDY_COARSE:
 452       return "ddy_coarse";
 453    case FS_OPCODE_DDY_FINE:
 454       return "ddy_fine";
 455
 456    case FS_OPCODE_CINTERP:
 457       return "cinterp";
 458    case FS_OPCODE_LINTERP:
 459       return "linterp";
 460
 461    case FS_OPCODE_PIXEL_X:
 462       return "pixel_x";
 463    case FS_OPCODE_PIXEL_Y:
 464       return "pixel_y";
 465
 466    case FS_OPCODE_GET_BUFFER_SIZE:
 467       return "fs_get_buffer_size";
 468
 469    case FS_OPCODE_UNIFORM_PULL_CONSTANT_LOAD:
 470       return "uniform_pull_const";
 471    case FS_OPCODE_UNIFORM_PULL_CONSTANT_LOAD_GEN7:
 472       return "uniform_pull_const_gen7";
 473    case FS_OPCODE_VARYING_PULL_CONSTANT_LOAD:
 474       return "varying_pull_const";
 475    case FS_OPCODE_VARYING_PULL_CONSTANT_LOAD_GEN7:
 476       return "varying_pull_const_gen7";
 477
 478    case FS_OPCODE_MOV_DISPATCH_TO_FLAGS:
 479       return "mov_dispatch_to_flags";
 480    case FS_OPCODE_DISCARD_JUMP:
 481       return "discard_jump";
 482
 483    case FS_OPCODE_SET_SAMPLE_ID:
 484       return "set_sample_id";
 485    case FS_OPCODE_SET_SIMD4X2_OFFSET:
 486       return "set_simd4x2_offset";
 487
 488    case FS_OPCODE_PACK_HALF_2x16_SPLIT:
 489       return "pack_half_2x16_split";
 490    case FS_OPCODE_UNPACK_HALF_2x16_SPLIT_X:
 491       return "unpack_half_2x16_split_x";
 492    case FS_OPCODE_UNPACK_HALF_2x16_SPLIT_Y:
 493       return "unpack_half_2x16_split_y";
 494
 495    case FS_OPCODE_PLACEHOLDER_HALT:
 496       return "placeholder_halt";
 497
 498    case FS_OPCODE_INTERPOLATE_AT_CENTROID:
 499       return "interp_centroid";
 500    case FS_OPCODE_INTERPOLATE_AT_SAMPLE:
 501       return "interp_sample";
 502    case FS_OPCODE_INTERPOLATE_AT_SHARED_OFFSET:
 503       return "interp_shared_offset";
 504    case FS_OPCODE_INTERPOLATE_AT_PER_SLOT_OFFSET:
 505       return "interp_per_slot_offset";
 506
 507    case VS_OPCODE_URB_WRITE:
 508       return "vs_urb_write";
 509    case VS_OPCODE_PULL_CONSTANT_LOAD:
 510       return "pull_constant_load";
 511    case VS_OPCODE_PULL_CONSTANT_LOAD_GEN7:
 512       return "pull_constant_load_gen7";
 513
 514    case VS_OPCODE_SET_SIMD4X2_HEADER_GEN9:
 515       return "set_simd4x2_header_gen9";
 516
 517    case VS_OPCODE_GET_BUFFER_SIZE:
 518       return "vs_get_buffer_size";
 519
 520    case VS_OPCODE_UNPACK_FLAGS_SIMD4X2:
 521       return "unpack_flags_simd4x2";
 522
 523    case GS_OPCODE_URB_WRITE:
 524       return "gs_urb_write";
 525    case GS_OPCODE_URB_WRITE_ALLOCATE:
 526       return "gs_urb_write_allocate";
 527    case GS_OPCODE_THREAD_END:
 528       return "gs_thread_end";
 529    case GS_OPCODE_SET_WRITE_OFFSET:
 530       return "set_write_offset";
 531    case GS_OPCODE_SET_VERTEX_COUNT:
 532       return "set_vertex_count";
 533    case GS_OPCODE_SET_DWORD_2:
 534       return "set_dword_2";
 535    case GS_OPCODE_PREPARE_CHANNEL_MASKS:
 536       return "prepare_channel_masks";
 537    case GS_OPCODE_SET_CHANNEL_MASKS:
 538       return "set_channel_masks";
 539    case GS_OPCODE_GET_INSTANCE_ID:
 540       return "get_instance_id";
 541    case GS_OPCODE_FF_SYNC:
 542       return "ff_sync";
 543    case GS_OPCODE_SET_PRIMITIVE_ID:
 544       return "set_primitive_id";
 545    case GS_OPCODE_SVB_WRITE:
 546       return "gs_svb_write";
 547    case GS_OPCODE_SVB_SET_DST_INDEX:
 548       return "gs_svb_set_dst_index";
 549    case GS_OPCODE_FF_SYNC_SET_PRIMITIVES:
 550       return "gs_ff_sync_set_primitives";
 551    case CS_OPCODE_CS_TERMINATE:
 552       return "cs_terminate";
 553    case SHADER_OPCODE_BARRIER:
 554       return "barrier";
 555    case SHADER_OPCODE_MULH:
 556       return "mulh";
 557    }
 558
 559    unreachable("not reached");
 560 }
 561
 562 bool
 563 brw_saturate_immediate(enum brw_reg_type type, struct brw_reg *reg)
 564 {
 565    union {
 566       unsigned ud;
 567       int d;
 568       float f;
 569    } imm = { reg->ud }, sat_imm = { 0 };
 570
 571    switch (type) {
 572    case BRW_REGISTER_TYPE_UD:
 573    case BRW_REGISTER_TYPE_D:
 574    case BRW_REGISTER_TYPE_UQ:
 575    case BRW_REGISTER_TYPE_Q:
 576       /* Nothing to do. */
 577       return false;
 578    case BRW_REGISTER_TYPE_UW:
 579       sat_imm.ud = CLAMP(imm.ud, 0, USHRT_MAX);
 580       break;
 581    case BRW_REGISTER_TYPE_W:
 582       sat_imm.d = CLAMP(imm.d, SHRT_MIN, SHRT_MAX);
 583       break;
 584    case BRW_REGISTER_TYPE_F:
 585       sat_imm.f = CLAMP(imm.f, 0.0f, 1.0f);
 586       break;
 587    case BRW_REGISTER_TYPE_UB:
 588    case BRW_REGISTER_TYPE_B:
 589       unreachable("no UB/B immediates");
 590    case BRW_REGISTER_TYPE_V:
 591    case BRW_REGISTER_TYPE_UV:
 592    case BRW_REGISTER_TYPE_VF:
 593       unreachable("unimplemented: saturate vector immediate");
 594    case BRW_REGISTER_TYPE_DF:
 595    case BRW_REGISTER_TYPE_HF:
 596       unreachable("unimplemented: saturate DF/HF immediate");
 597    }
 598
 599    if (imm.ud != sat_imm.ud) {
 600       reg->ud = sat_imm.ud;
 601       return true;
 602    }
 603    return false;
 604 }
 605
 606 bool
 607 brw_negate_immediate(enum brw_reg_type type, struct brw_reg *reg)
 608 {
 609    switch (type) {
 610    case BRW_REGISTER_TYPE_D:
 611    case BRW_REGISTER_TYPE_UD:
 612       reg->d = -reg->d;
 613       return true;
 614    case BRW_REGISTER_TYPE_W:
 615    case BRW_REGISTER_TYPE_UW:
 616       reg->d = -(int16_t)reg->ud;
 617       return true;
 618    case BRW_REGISTER_TYPE_F:
 619       reg->f = -reg->f;
 620       return true;
 621    case BRW_REGISTER_TYPE_VF:
 622       reg->ud ^= 0x80808080;
 623       return true;
 624    case BRW_REGISTER_TYPE_UB:
 625    case BRW_REGISTER_TYPE_B:
 626       unreachable("no UB/B immediates");
 627    case BRW_REGISTER_TYPE_UV:
 628    case BRW_REGISTER_TYPE_V:
 629       assert(!"unimplemented: negate UV/V immediate");
 630    case BRW_REGISTER_TYPE_UQ:
 631    case BRW_REGISTER_TYPE_Q:
 632       assert(!"unimplemented: negate UQ/Q immediate");
 633    case BRW_REGISTER_TYPE_DF:
 634    case BRW_REGISTER_TYPE_HF:
 635       assert(!"unimplemented: negate DF/HF immediate");
 636    }
 637
 638    return false;
 639 }
 640
 641 bool
 642 brw_abs_immediate(enum brw_reg_type type, struct brw_reg *reg)
 643 {
 644    switch (type) {
 645    case BRW_REGISTER_TYPE_D:
 646       reg->d = abs(reg->d);
 647       return true;
 648    case BRW_REGISTER_TYPE_W:
 649       reg->d = abs((int16_t)reg->ud);
 650       return true;
 651    case BRW_REGISTER_TYPE_F:
 652       reg->f = fabsf(reg->f);
 653       return true;
 654    case BRW_REGISTER_TYPE_VF:
 655       reg->ud &= ~0x80808080;
 656       return true;
 657    case BRW_REGISTER_TYPE_UB:
 658    case BRW_REGISTER_TYPE_B:
 659       unreachable("no UB/B immediates");
 660    case BRW_REGISTER_TYPE_UQ:
 661    case BRW_REGISTER_TYPE_UD:
 662    case BRW_REGISTER_TYPE_UW:
 663    case BRW_REGISTER_TYPE_UV:
 664       /* Presumably the absolute value modifier on an unsigned source is a
 665        * nop, but it would be nice to confirm.
 666        */
 667       assert(!"unimplemented: abs unsigned immediate");
 668    case BRW_REGISTER_TYPE_V:
 669       assert(!"unimplemented: abs V immediate");
 670    case BRW_REGISTER_TYPE_Q:
 671       assert(!"unimplemented: abs Q immediate");
 672    case BRW_REGISTER_TYPE_DF:
 673    case BRW_REGISTER_TYPE_HF:
 674       assert(!"unimplemented: abs DF/HF immediate");
 675    }
 676
 677    return false;
 678 }
 679
 680 backend_shader::backend_shader(const struct brw_compiler *compiler,
 681                                void *log_data,
 682                                void *mem_ctx,
 683                                const nir_shader *shader,
 684                                struct brw_stage_prog_data *stage_prog_data)
 685    : compiler(compiler),
 686      log_data(log_data),
 687      devinfo(compiler->devinfo),
 688      nir(shader),
 689      stage_prog_data(stage_prog_data),
 690      mem_ctx(mem_ctx),
 691      cfg(NULL),
 692      stage(shader->stage)
 693 {
 694    debug_enabled = INTEL_DEBUG & intel_debug_flag_for_shader_stage(stage);
 695    stage_name = _mesa_shader_stage_to_string(stage);
 696    stage_abbrev = _mesa_shader_stage_to_abbrev(stage);
 697 }
 698
 699 bool
 700 backend_reg::is_zero() const
 701 {
 702    if (file != IMM)
 703       return false;
 704
 705    return d == 0;
 706 }
 707
 708 bool
 709 backend_reg::is_one() const
 710 {
 711    if (file != IMM)
 712       return false;
 713
 714    return type == BRW_REGISTER_TYPE_F
 715           ? f == 1.0
 716           : d == 1;
 717 }
 718
 719 bool
 720 backend_reg::is_negative_one() const
 721 {
 722    if (file != IMM)
 723       return false;
 724
 725    switch (type) {
 726    case BRW_REGISTER_TYPE_F:
 727       return f == -1.0;
 728    case BRW_REGISTER_TYPE_D:
 729       return d == -1;
 730    default:
 731       return false;
 732    }
 733 }
 734
 735 bool
 736 backend_reg::is_null() const
 737 {
 738    return file == ARF && nr == BRW_ARF_NULL;
 739 }
 740
 741
 742 bool
 743 backend_reg::is_accumulator() const
 744 {
 745    return file == ARF && nr == BRW_ARF_ACCUMULATOR;
 746 }
 747
 748 bool
 749 backend_reg::in_range(const backend_reg &r, unsigned n) const
 750 {
 751    return (file == r.file &&
 752            nr == r.nr &&
 753            reg_offset >= r.reg_offset &&
 754            reg_offset < r.reg_offset + n);
 755 }
 756
 757 bool
 758 backend_instruction::is_commutative() const
 759 {
 760    switch (opcode) {
 761    case BRW_OPCODE_AND:
 762    case BRW_OPCODE_OR:
 763    case BRW_OPCODE_XOR:
 764    case BRW_OPCODE_ADD:
 765    case BRW_OPCODE_MUL:
 766    case SHADER_OPCODE_MULH:
 767       return true;
 768    case BRW_OPCODE_SEL:
 769       /* MIN and MAX are commutative. */
 770       if (conditional_mod == BRW_CONDITIONAL_GE ||
 771           conditional_mod == BRW_CONDITIONAL_L) {
 772          return true;
 773       }
 774       /* fallthrough */
 775    default:
 776       return false;
 777    }
 778 }
 779
 780 bool
 781 backend_instruction::is_3src() const
 782 {
 783    return ::is_3src(opcode);
 784 }
 785
 786 bool
 787 backend_instruction::is_tex() const
 788 {
 789    return (opcode == SHADER_OPCODE_TEX ||
 790            opcode == FS_OPCODE_TXB ||
 791            opcode == SHADER_OPCODE_TXD ||
 792            opcode == SHADER_OPCODE_TXF ||
 793            opcode == SHADER_OPCODE_TXF_CMS ||
 794            opcode == SHADER_OPCODE_TXF_CMS_W ||
 795            opcode == SHADER_OPCODE_TXF_UMS ||
 796            opcode == SHADER_OPCODE_TXF_MCS ||
 797            opcode == SHADER_OPCODE_TXL ||
 798            opcode == SHADER_OPCODE_TXS ||
 799            opcode == SHADER_OPCODE_LOD ||
 800            opcode == SHADER_OPCODE_TG4 ||
 801            opcode == SHADER_OPCODE_TG4_OFFSET);
 802 }
 803
 804 bool
 805 backend_instruction::is_math() const
 806 {
 807    return (opcode == SHADER_OPCODE_RCP ||
 808            opcode == SHADER_OPCODE_RSQ ||
 809            opcode == SHADER_OPCODE_SQRT ||
 810            opcode == SHADER_OPCODE_EXP2 ||
 811            opcode == SHADER_OPCODE_LOG2 ||
 812            opcode == SHADER_OPCODE_SIN ||
 813            opcode == SHADER_OPCODE_COS ||
 814            opcode == SHADER_OPCODE_INT_QUOTIENT ||
 815            opcode == SHADER_OPCODE_INT_REMAINDER ||
 816            opcode == SHADER_OPCODE_POW);
 817 }
 818
 819 bool
 820 backend_instruction::is_control_flow() const
 821 {
 822    switch (opcode) {
 823    case BRW_OPCODE_DO:
 824    case BRW_OPCODE_WHILE:
 825    case BRW_OPCODE_IF:
 826    case BRW_OPCODE_ELSE:
 827    case BRW_OPCODE_ENDIF:
 828    case BRW_OPCODE_BREAK:
 829    case BRW_OPCODE_CONTINUE:
 830       return true;
 831    default:
 832       return false;
 833    }
 834 }
 835
 836 bool
 837 backend_instruction::can_do_source_mods() const
 838 {
 839    switch (opcode) {
 840    case BRW_OPCODE_ADDC:
 841    case BRW_OPCODE_BFE:
 842    case BRW_OPCODE_BFI1:
 843    case BRW_OPCODE_BFI2:
 844    case BRW_OPCODE_BFREV:
 845    case BRW_OPCODE_CBIT:
 846    case BRW_OPCODE_FBH:
 847    case BRW_OPCODE_FBL:
 848    case BRW_OPCODE_SUBB:
 849       return false;
 850    default:
 851       return true;
 852    }
 853 }
 854
 855 bool
 856 backend_instruction::can_do_saturate() const
 857 {
 858    switch (opcode) {
 859    case BRW_OPCODE_ADD:
 860    case BRW_OPCODE_ASR:
 861    case BRW_OPCODE_AVG:
 862    case BRW_OPCODE_DP2:
 863    case BRW_OPCODE_DP3:
 864    case BRW_OPCODE_DP4:
 865    case BRW_OPCODE_DPH:
 866    case BRW_OPCODE_F16TO32:
 867    case BRW_OPCODE_F32TO16:
 868    case BRW_OPCODE_LINE:
 869    case BRW_OPCODE_LRP:
 870    case BRW_OPCODE_MAC:
 871    case BRW_OPCODE_MAD:
 872    case BRW_OPCODE_MATH:
 873    case BRW_OPCODE_MOV:
 874    case BRW_OPCODE_MUL:
 875    case SHADER_OPCODE_MULH:
 876    case BRW_OPCODE_PLN:
 877    case BRW_OPCODE_RNDD:
 878    case BRW_OPCODE_RNDE:
 879    case BRW_OPCODE_RNDU:
 880    case BRW_OPCODE_RNDZ:
 881    case BRW_OPCODE_SEL:
 882    case BRW_OPCODE_SHL:
 883    case BRW_OPCODE_SHR:
 884    case FS_OPCODE_LINTERP:
 885    case SHADER_OPCODE_COS:
 886    case SHADER_OPCODE_EXP2:
 887    case SHADER_OPCODE_LOG2:
 888    case SHADER_OPCODE_POW:
 889    case SHADER_OPCODE_RCP:
 890    case SHADER_OPCODE_RSQ:
 891    case SHADER_OPCODE_SIN:
 892    case SHADER_OPCODE_SQRT:
 893       return true;
 894    default:
 895       return false;
 896    }
 897 }
 898
 899 bool
 900 backend_instruction::can_do_cmod() const
 901 {
 902    switch (opcode) {
 903    case BRW_OPCODE_ADD:
 904    case BRW_OPCODE_ADDC:
 905    case BRW_OPCODE_AND:
 906    case BRW_OPCODE_ASR:
 907    case BRW_OPCODE_AVG:
 908    case BRW_OPCODE_CMP:
 909    case BRW_OPCODE_CMPN:
 910    case BRW_OPCODE_DP2:
 911    case BRW_OPCODE_DP3:
 912    case BRW_OPCODE_DP4:
 913    case BRW_OPCODE_DPH:
 914    case BRW_OPCODE_F16TO32:
 915    case BRW_OPCODE_F32TO16:
 916    case BRW_OPCODE_FRC:
 917    case BRW_OPCODE_LINE:
 918    case BRW_OPCODE_LRP:
 919    case BRW_OPCODE_LZD:
 920    case BRW_OPCODE_MAC:
 921    case BRW_OPCODE_MACH:
 922    case BRW_OPCODE_MAD:
 923    case BRW_OPCODE_MOV:
 924    case BRW_OPCODE_MUL:
 925    case BRW_OPCODE_NOT:
 926    case BRW_OPCODE_OR:
 927    case BRW_OPCODE_PLN:
 928    case BRW_OPCODE_RNDD:
 929    case BRW_OPCODE_RNDE:
 930    case BRW_OPCODE_RNDU:
 931    case BRW_OPCODE_RNDZ:
 932    case BRW_OPCODE_SAD2:
 933    case BRW_OPCODE_SADA2:
 934    case BRW_OPCODE_SHL:
 935    case BRW_OPCODE_SHR:
 936    case BRW_OPCODE_SUBB:
 937    case BRW_OPCODE_XOR:
 938    case FS_OPCODE_CINTERP:
 939    case FS_OPCODE_LINTERP:
 940       return true;
 941    default:
 942       return false;
 943    }
 944 }
 945
 946 bool
 947 backend_instruction::reads_accumulator_implicitly() const
 948 {
 949    switch (opcode) {
 950    case BRW_OPCODE_MAC:
 951    case BRW_OPCODE_MACH:
 952    case BRW_OPCODE_SADA2:
 953       return true;
 954    default:
 955       return false;
 956    }
 957 }
 958
 959 bool
 960 backend_instruction::writes_accumulator_implicitly(const struct brw_device_info *devinfo) const
 961 {
 962    return writes_accumulator ||
 963           (devinfo->gen < 6 &&
 964            ((opcode >= BRW_OPCODE_ADD && opcode < BRW_OPCODE_NOP) ||
 965             (opcode >= FS_OPCODE_DDX_COARSE && opcode <= FS_OPCODE_LINTERP &&
 966              opcode != FS_OPCODE_CINTERP)));
 967 }
 968
 969 bool
 970 backend_instruction::has_side_effects() const
 971 {
 972    switch (opcode) {
 973    case SHADER_OPCODE_UNTYPED_ATOMIC:
 974    case SHADER_OPCODE_UNTYPED_ATOMIC_LOGICAL:
 975    case SHADER_OPCODE_GEN4_SCRATCH_WRITE:
 976    case SHADER_OPCODE_UNTYPED_SURFACE_WRITE:
 977    case SHADER_OPCODE_UNTYPED_SURFACE_WRITE_LOGICAL:
 978    case SHADER_OPCODE_TYPED_ATOMIC:
 979    case SHADER_OPCODE_TYPED_ATOMIC_LOGICAL:
 980    case SHADER_OPCODE_TYPED_SURFACE_WRITE:
 981    case SHADER_OPCODE_TYPED_SURFACE_WRITE_LOGICAL:
 982    case SHADER_OPCODE_MEMORY_FENCE:
 983    case SHADER_OPCODE_URB_WRITE_SIMD8:
 984    case SHADER_OPCODE_URB_WRITE_SIMD8_PER_SLOT:
 985    case SHADER_OPCODE_URB_WRITE_SIMD8_MASKED:
 986    case SHADER_OPCODE_URB_WRITE_SIMD8_MASKED_PER_SLOT:
 987    case FS_OPCODE_FB_WRITE:
 988    case SHADER_OPCODE_BARRIER:
 989       return true;
 990    default:
 991       return false;
 992    }
 993 }
 994
 995 bool
 996 backend_instruction::is_volatile() const
 997 {
 998    switch (opcode) {
 999    case SHADER_OPCODE_UNTYPED_SURFACE_READ:
1000    case SHADER_OPCODE_UNTYPED_SURFACE_READ_LOGICAL:
1001    case SHADER_OPCODE_TYPED_SURFACE_READ:
1002    case SHADER_OPCODE_TYPED_SURFACE_READ_LOGICAL:
1003       return true;
1004    default:
1005       return false;
1006    }
1007 }
1008
1009 #ifndef NDEBUG
1010 static bool
1011 inst_is_in_block(const bblock_t *block, const backend_instruction *inst)
1012 {
1013    bool found = false;
1014    foreach_inst_in_block (backend_instruction, i, block) {
1015       if (inst == i) {
1016          found = true;
1017       }
1018    }
1019    return found;
1020 }
1021 #endif
1022
1023 static void
1024 adjust_later_block_ips(bblock_t *start_block, int ip_adjustment)
1025 {
1026    for (bblock_t *block_iter = start_block->next();
1027         !block_iter->link.is_tail_sentinel();
1028         block_iter = block_iter->next()) {
1029       block_iter->start_ip += ip_adjustment;
1030       block_iter->end_ip += ip_adjustment;
1031    }
1032 }
1033
1034 void
1035 backend_instruction::insert_after(bblock_t *block, backend_instruction *inst)
1036 {
1037    if (!this->is_head_sentinel())
1038       assert(inst_is_in_block(block, this) || !"Instruction not in block");
1039
1040    block->end_ip++;
1041
1042    adjust_later_block_ips(block, 1);
1043
1044    exec_node::insert_after(inst);
1045 }
1046
1047 void
1048 backend_instruction::insert_before(bblock_t *block, backend_instruction *inst)
1049 {
1050    if (!this->is_tail_sentinel())
1051       assert(inst_is_in_block(block, this) || !"Instruction not in block");
1052
1053    block->end_ip++;
1054
1055    adjust_later_block_ips(block, 1);
1056
1057    exec_node::insert_before(inst);
1058 }
1059
1060 void
1061 backend_instruction::insert_before(bblock_t *block, exec_list *list)
1062 {
1063    assert(inst_is_in_block(block, this) || !"Instruction not in block");
1064
1065    unsigned num_inst = list->length();
1066
1067    block->end_ip += num_inst;
1068
1069    adjust_later_block_ips(block, num_inst);
1070
1071    exec_node::insert_before(list);
1072 }
1073
1074 void
1075 backend_instruction::remove(bblock_t *block)
1076 {
1077    assert(inst_is_in_block(block, this) || !"Instruction not in block");
1078
1079    adjust_later_block_ips(block, -1);
1080
1081    if (block->start_ip == block->end_ip) {
1082       block->cfg->remove_block(block);
1083    } else {
1084       block->end_ip--;
1085    }
1086
1087    exec_node::remove();
1088 }
1089
1090 void
1091 backend_shader::dump_instructions()
1092 {
1093    dump_instructions(NULL);
1094 }
1095
1096 void
1097 backend_shader::dump_instructions(const char *name)
1098 {
1099    FILE *file = stderr;
1100    if (name && geteuid() != 0) {
1101       file = fopen(name, "w");
1102       if (!file)
1103          file = stderr;
1104    }
1105
1106    if (cfg) {
1107       int ip = 0;
1108       foreach_block_and_inst(block, backend_instruction, inst, cfg) {
1109          if (!unlikely(INTEL_DEBUG & DEBUG_OPTIMIZER))
1110             fprintf(file, "%4d: ", ip++);
1111          dump_instruction(inst, file);
1112       }
1113    } else {
1114       int ip = 0;
1115       foreach_in_list(backend_instruction, inst, &instructions) {
1116          if (!unlikely(INTEL_DEBUG & DEBUG_OPTIMIZER))
1117             fprintf(file, "%4d: ", ip++);
1118          dump_instruction(inst, file);
1119       }
1120    }
1121
1122    if (file != stderr) {
1123       fclose(file);
1124    }
1125 }
1126
1127 void
1128 backend_shader::calculate_cfg()
1129 {
1130    if (this->cfg)
1131       return;
1132    cfg = new(mem_ctx) cfg_t(&this->instructions);
1133 }
1134
1135 void
1136 backend_shader::invalidate_cfg()
1137 {
1138    ralloc_free(this->cfg);
1139    this->cfg = NULL;
1140 }
1141
1142 /**
1143  * Sets up the starting offsets for the groups of binding table entries
1144  * commong to all pipeline stages.
1145  *
1146  * Unused groups are initialized to 0xd0d0d0d0 to make it obvious that they're
1147  * unused but also make sure that addition of small offsets to them will
1148  * trigger some of our asserts that surface indices are < BRW_MAX_SURFACES.
1149  */
1150 void
1151 brw_assign_common_binding_table_offsets(gl_shader_stage stage,
1152                                         const struct brw_device_info *devinfo,
1153                                         const struct gl_shader_program *shader_prog,
1154                                         const struct gl_program *prog,
1155                                         struct brw_stage_prog_data *stage_prog_data,
1156                                         uint32_t next_binding_table_offset)
1157 {
1158    const struct gl_shader *shader = NULL;
1159    int num_textures = _mesa_fls(prog->SamplersUsed);
1160
1161    if (shader_prog)
1162       shader = shader_prog->_LinkedShaders[stage];
1163
1164    stage_prog_data->binding_table.texture_start = next_binding_table_offset;
1165    next_binding_table_offset += num_textures;
1166
1167    if (shader) {
1168       assert(shader->NumUniformBlocks <= BRW_MAX_UBO);
1169       stage_prog_data->binding_table.ubo_start = next_binding_table_offset;
1170       next_binding_table_offset += shader->NumUniformBlocks;
1171
1172       assert(shader->NumShaderStorageBlocks <= BRW_MAX_SSBO);
1173       stage_prog_data->binding_table.ssbo_start = next_binding_table_offset;
1174       next_binding_table_offset += shader->NumShaderStorageBlocks;
1175    } else {
1176       stage_prog_data->binding_table.ubo_start = 0xd0d0d0d0;
1177       stage_prog_data->binding_table.ssbo_start = 0xd0d0d0d0;
1178    }
1179
1180    if (INTEL_DEBUG & DEBUG_SHADER_TIME) {
1181       stage_prog_data->binding_table.shader_time_start = next_binding_table_offset;
1182       next_binding_table_offset++;
1183    } else {
1184       stage_prog_data->binding_table.shader_time_start = 0xd0d0d0d0;
1185    }
1186
1187    if (prog->UsesGather) {
1188       if (devinfo->gen >= 8) {
1189          stage_prog_data->binding_table.gather_texture_start =
1190             stage_prog_data->binding_table.texture_start;
1191       } else {
1192          stage_prog_data->binding_table.gather_texture_start = next_binding_table_offset;
1193          next_binding_table_offset += num_textures;
1194       }
1195    } else {
1196       stage_prog_data->binding_table.gather_texture_start = 0xd0d0d0d0;
1197    }
1198
1199    if (shader && shader->NumAtomicBuffers) {
1200       stage_prog_data->binding_table.abo_start = next_binding_table_offset;
1201       next_binding_table_offset += shader->NumAtomicBuffers;
1202    } else {
1203       stage_prog_data->binding_table.abo_start = 0xd0d0d0d0;
1204    }
1205
1206    if (shader && shader->NumImages) {
1207       stage_prog_data->binding_table.image_start = next_binding_table_offset;
1208       next_binding_table_offset += shader->NumImages;
1209    } else {
1210       stage_prog_data->binding_table.image_start = 0xd0d0d0d0;
1211    }
1212
1213    /* This may or may not be used depending on how the compile goes. */
1214    stage_prog_data->binding_table.pull_constants_start = next_binding_table_offset;
1215    next_binding_table_offset++;
1216
1217    assert(next_binding_table_offset <= BRW_MAX_SURFACES);
1218
1219    /* prog_data->base.binding_table.size will be set by brw_mark_surface_used. */
1220 }
1221
1222 static void
1223 setup_vec4_uniform_value(const gl_constant_value **params,
1224                          const gl_constant_value *values,
1225                          unsigned n)
1226 {
1227    static const gl_constant_value zero = { 0 };
1228
1229    for (unsigned i = 0; i < n; ++i)
1230       params[i] = &values[i];
1231
1232    for (unsigned i = n; i < 4; ++i)
1233       params[i] = &zero;
1234 }
1235
1236 void
1237 brw_setup_image_uniform_values(gl_shader_stage stage,
1238                                struct brw_stage_prog_data *stage_prog_data,
1239                                unsigned param_start_index,
1240                                const gl_uniform_storage *storage)
1241 {
1242    const gl_constant_value **param =
1243       &stage_prog_data->param[param_start_index];
1244
1245    for (unsigned i = 0; i < MAX2(storage->array_elements, 1); i++) {
1246       const unsigned image_idx = storage->opaque[stage].index + i;
1247       const brw_image_param *image_param =
1248          &stage_prog_data->image_param[image_idx];
1249
1250       /* Upload the brw_image_param structure.  The order is expected to match
1251        * the BRW_IMAGE_PARAM_*_OFFSET defines.
1252        */
1253       setup_vec4_uniform_value(param + BRW_IMAGE_PARAM_SURFACE_IDX_OFFSET,
1254          (const gl_constant_value *)&image_param->surface_idx, 1);
1255       setup_vec4_uniform_value(param + BRW_IMAGE_PARAM_OFFSET_OFFSET,
1256          (const gl_constant_value *)image_param->offset, 2);
1257       setup_vec4_uniform_value(param + BRW_IMAGE_PARAM_SIZE_OFFSET,
1258          (const gl_constant_value *)image_param->size, 3);
1259       setup_vec4_uniform_value(param + BRW_IMAGE_PARAM_STRIDE_OFFSET,
1260          (const gl_constant_value *)image_param->stride, 4);
1261       setup_vec4_uniform_value(param + BRW_IMAGE_PARAM_TILING_OFFSET,
1262          (const gl_constant_value *)image_param->tiling, 3);
1263       setup_vec4_uniform_value(param + BRW_IMAGE_PARAM_SWIZZLING_OFFSET,
1264          (const gl_constant_value *)image_param->swizzling, 2);
1265       param += BRW_IMAGE_PARAM_SIZE;
1266
1267       brw_mark_surface_used(
1268          stage_prog_data,
1269          stage_prog_data->binding_table.image_start + image_idx);
1270    }
1271 }
1272
1273 /**
1274  * Decide which set of clip planes should be used when clipping via
1275  * gl_Position or gl_ClipVertex.
1276  */
1277 gl_clip_plane *brw_select_clip_planes(struct gl_context *ctx)
1278 {
1279    if (ctx->_Shader->CurrentProgram[MESA_SHADER_VERTEX]) {
1280       /* There is currently a GLSL vertex shader, so clip according to GLSL
1281        * rules, which means compare gl_ClipVertex (or gl_Position, if
1282        * gl_ClipVertex wasn't assigned) against the eye-coordinate clip planes
1283        * that were stored in EyeUserPlane at the time the clip planes were
1284        * specified.
1285        */
1286       return ctx->Transform.EyeUserPlane;
1287    } else {
1288       /* Either we are using fixed function or an ARB vertex program.  In
1289        * either case the clip planes are going to be compared against
1290        * gl_Position (which is in clip coordinates) so we have to clip using
1291        * _ClipUserPlane, which was transformed into clip coordinates by Mesa
1292        * core.
1293        */
1294       return ctx->Transform._ClipUserPlane;
1295    }
1296 }
1297