src/mesa/drivers/dri/i965/brw_fs.h

   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  * Authors:
  24  *    Eric Anholt <eric@anholt.net>
  25  *
  26  */
  27
  28 #pragma once
  29
  30 #include "brw_shader.h"
  31
  32 extern "C" {
  33
  34 #include <sys/types.h>
  35
  36 #include "main/macros.h"
  37 #include "main/shaderobj.h"
  38 #include "main/uniforms.h"
  39 #include "program/prog_parameter.h"
  40 #include "program/prog_print.h"
  41 #include "program/prog_optimize.h"
  42 #include "program/register_allocate.h"
  43 #include "program/sampler.h"
  44 #include "program/hash_table.h"
  45 #include "brw_context.h"
  46 #include "brw_eu.h"
  47 #include "brw_wm.h"
  48 #include "brw_shader.h"
  49 }
  50 #include "glsl/glsl_types.h"
  51 #include "glsl/ir.h"
  52
  53 class bblock_t;
  54 namespace {
  55    struct acp_entry;
  56 }
  57
  58 namespace brw {
  59    class fs_live_variables;
  60 }
  61
  62 class fs_reg {
  63 public:
  64    DECLARE_RALLOC_CXX_OPERATORS(fs_reg)
  65
  66    void init();
  67
  68    fs_reg();
  69    fs_reg(float f);
  70    fs_reg(int32_t i);
  71    fs_reg(uint32_t u);
  72    fs_reg(struct brw_reg fixed_hw_reg);
  73    fs_reg(enum register_file file, int reg);
  74    fs_reg(enum register_file file, int reg, uint32_t type);
  75    fs_reg(class fs_visitor *v, const struct glsl_type *type);
  76
  77    bool equals(const fs_reg &r) const;
  78    bool is_zero() const;
  79    bool is_one() const;
  80    bool is_valid_3src() const;
  81    fs_reg retype(uint32_t type);
  82
  83    /** Register file: GRF, MRF, IMM. */
  84    enum register_file file;
  85    /**
  86     * Register number.  For MRF, it's the hardware register.  For
  87     * GRF, it's a virtual register number until register allocation
  88     */
  89    int reg;
  90    /**
  91     * For virtual registers, this is a hardware register offset from
  92     * the start of the register block (for example, a constant index
  93     * in an array access).
  94     */
  95    int reg_offset;
  96    /** Register type.  BRW_REGISTER_TYPE_* */
  97    int type;
  98    bool negate;
  99    bool abs;
 100    bool sechalf;
 101    struct brw_reg fixed_hw_reg;
 102    int smear; /* -1, or a channel of the reg to smear to all channels. */
 103
 104    /** Value for file == IMM */
 105    union {
 106       int32_t i;
 107       uint32_t u;
 108       float f;
 109    } imm;
 110
 111    fs_reg *reladdr;
 112 };
 113
 114 static const fs_reg reg_undef;
 115 static const fs_reg reg_null_f(retype(brw_null_reg(), BRW_REGISTER_TYPE_F));
 116 static const fs_reg reg_null_d(retype(brw_null_reg(), BRW_REGISTER_TYPE_D));
 117 static const fs_reg reg_null_ud(retype(brw_null_reg(), BRW_REGISTER_TYPE_UD));
 118
 119 class ip_record : public exec_node {
 120 public:
 121    DECLARE_RALLOC_CXX_OPERATORS(ip_record)
 122
 123    ip_record(int ip)
 124    {
 125       this->ip = ip;
 126    }
 127
 128    int ip;
 129 };
 130
 131 class fs_inst : public backend_instruction {
 132 public:
 133    DECLARE_RALLOC_CXX_OPERATORS(fs_inst)
 134
 135    void init();
 136
 137    fs_inst();
 138    fs_inst(enum opcode opcode);
 139    fs_inst(enum opcode opcode, fs_reg dst);
 140    fs_inst(enum opcode opcode, fs_reg dst, fs_reg src0);
 141    fs_inst(enum opcode opcode, fs_reg dst, fs_reg src0, fs_reg src1);
 142    fs_inst(enum opcode opcode, fs_reg dst,
 143            fs_reg src0, fs_reg src1,fs_reg src2);
 144
 145    bool equals(fs_inst *inst);
 146    bool overwrites_reg(const fs_reg &reg);
 147    bool is_send_from_grf();
 148    bool is_partial_write();
 149    int regs_read(fs_visitor *v, int arg);
 150
 151    fs_reg dst;
 152    fs_reg src[3];
 153    bool saturate;
 154    int conditional_mod; /**< BRW_CONDITIONAL_* */
 155
 156    /* Chooses which flag subregister (f0.0 or f0.1) is used for conditional
 157     * mod and predication.
 158     */
 159    uint8_t flag_subreg;
 160
 161    int mlen; /**< SEND message length */
 162    int regs_written; /**< Number of vgrfs written by a SEND message, or 1 */
 163    int base_mrf; /**< First MRF in the SEND message, if mlen is nonzero. */
 164    uint32_t texture_offset; /**< Texture offset bitfield */
 165    int sampler;
 166    int target; /**< MRT target. */
 167    bool eot;
 168    bool header_present;
 169    bool shadow_compare;
 170    bool force_uncompressed;
 171    bool force_sechalf;
 172    bool force_writemask_all;
 173    uint32_t offset; /* spill/unspill offset */
 174
 175    /** @{
 176     * Annotation for the generated IR.  One of the two can be set.
 177     */
 178    const void *ir;
 179    const char *annotation;
 180    /** @} */
 181 };
 182
 183 /**
 184  * The fragment shader front-end.
 185  *
 186  * Translates either GLSL IR or Mesa IR (for ARB_fragment_program) into FS IR.
 187  */
 188 class fs_visitor : public backend_visitor
 189 {
 190 public:
 191
 192    fs_visitor(struct brw_context *brw,
 193               struct brw_wm_compile *c,
 194               struct gl_shader_program *shader_prog,
 195               struct gl_fragment_program *fp,
 196               unsigned dispatch_width);
 197    ~fs_visitor();
 198
 199    fs_reg *variable_storage(ir_variable *var);
 200    int virtual_grf_alloc(int size);
 201    void import_uniforms(fs_visitor *v);
 202
 203    void visit(ir_variable *ir);
 204    void visit(ir_assignment *ir);
 205    void visit(ir_dereference_variable *ir);
 206    void visit(ir_dereference_record *ir);
 207    void visit(ir_dereference_array *ir);
 208    void visit(ir_expression *ir);
 209    void visit(ir_texture *ir);
 210    void visit(ir_if *ir);
 211    void visit(ir_constant *ir);
 212    void visit(ir_swizzle *ir);
 213    void visit(ir_return *ir);
 214    void visit(ir_loop *ir);
 215    void visit(ir_loop_jump *ir);
 216    void visit(ir_discard *ir);
 217    void visit(ir_call *ir);
 218    void visit(ir_function *ir);
 219    void visit(ir_function_signature *ir);
 220    void visit(ir_emit_vertex *);
 221    void visit(ir_end_primitive *);
 222
 223    uint32_t gather_channel(ir_texture *ir, int sampler);
 224    void swizzle_result(ir_texture *ir, fs_reg orig_val, int sampler);
 225
 226    bool can_do_source_mods(fs_inst *inst);
 227
 228    fs_inst *emit(fs_inst inst);
 229    fs_inst *emit(fs_inst *inst);
 230    void emit(exec_list list);
 231
 232    fs_inst *emit(enum opcode opcode);
 233    fs_inst *emit(enum opcode opcode, fs_reg dst);
 234    fs_inst *emit(enum opcode opcode, fs_reg dst, fs_reg src0);
 235    fs_inst *emit(enum opcode opcode, fs_reg dst, fs_reg src0, fs_reg src1);
 236    fs_inst *emit(enum opcode opcode, fs_reg dst,
 237                  fs_reg src0, fs_reg src1, fs_reg src2);
 238
 239    fs_inst *MOV(fs_reg dst, fs_reg src);
 240    fs_inst *NOT(fs_reg dst, fs_reg src);
 241    fs_inst *RNDD(fs_reg dst, fs_reg src);
 242    fs_inst *RNDE(fs_reg dst, fs_reg src);
 243    fs_inst *RNDZ(fs_reg dst, fs_reg src);
 244    fs_inst *FRC(fs_reg dst, fs_reg src);
 245    fs_inst *ADD(fs_reg dst, fs_reg src0, fs_reg src1);
 246    fs_inst *MUL(fs_reg dst, fs_reg src0, fs_reg src1);
 247    fs_inst *MACH(fs_reg dst, fs_reg src0, fs_reg src1);
 248    fs_inst *MAC(fs_reg dst, fs_reg src0, fs_reg src1);
 249    fs_inst *SHL(fs_reg dst, fs_reg src0, fs_reg src1);
 250    fs_inst *SHR(fs_reg dst, fs_reg src0, fs_reg src1);
 251    fs_inst *ASR(fs_reg dst, fs_reg src0, fs_reg src1);
 252    fs_inst *AND(fs_reg dst, fs_reg src0, fs_reg src1);
 253    fs_inst *OR(fs_reg dst, fs_reg src0, fs_reg src1);
 254    fs_inst *XOR(fs_reg dst, fs_reg src0, fs_reg src1);
 255    fs_inst *IF(uint32_t predicate);
 256    fs_inst *IF(fs_reg src0, fs_reg src1, uint32_t condition);
 257    fs_inst *CMP(fs_reg dst, fs_reg src0, fs_reg src1,
 258                 uint32_t condition);
 259    fs_inst *LRP(fs_reg dst, fs_reg a, fs_reg y, fs_reg x);
 260    fs_inst *DEP_RESOLVE_MOV(int grf);
 261    fs_inst *BFREV(fs_reg dst, fs_reg value);
 262    fs_inst *BFE(fs_reg dst, fs_reg bits, fs_reg offset, fs_reg value);
 263    fs_inst *BFI1(fs_reg dst, fs_reg bits, fs_reg offset);
 264    fs_inst *BFI2(fs_reg dst, fs_reg bfi1_dst, fs_reg insert, fs_reg base);
 265    fs_inst *FBH(fs_reg dst, fs_reg value);
 266    fs_inst *FBL(fs_reg dst, fs_reg value);
 267    fs_inst *CBIT(fs_reg dst, fs_reg value);
 268    fs_inst *MAD(fs_reg dst, fs_reg c, fs_reg b, fs_reg a);
 269    fs_inst *ADDC(fs_reg dst, fs_reg src0, fs_reg src1);
 270    fs_inst *SUBB(fs_reg dst, fs_reg src0, fs_reg src1);
 271
 272    int type_size(const struct glsl_type *type);
 273    fs_inst *get_instruction_generating_reg(fs_inst *start,
 274                                            fs_inst *end,
 275                                            fs_reg reg);
 276
 277    exec_list VARYING_PULL_CONSTANT_LOAD(fs_reg dst, fs_reg surf_index,
 278                                         fs_reg varying_offset,
 279                                         uint32_t const_offset);
 280
 281    bool run();
 282    void setup_payload_gen4();
 283    void setup_payload_gen6();
 284    void assign_curb_setup();
 285    void calculate_urb_setup();
 286    void assign_urb_setup();
 287    bool assign_regs();
 288    void assign_regs_trivial();
 289    void setup_payload_interference(struct ra_graph *g, int payload_reg_count,
 290                                    int first_payload_node);
 291    void setup_mrf_hack_interference(struct ra_graph *g,
 292                                     int first_mrf_hack_node);
 293    int choose_spill_reg(struct ra_graph *g);
 294    void spill_reg(int spill_reg);
 295    void split_virtual_grfs();
 296    void compact_virtual_grfs();
 297    void move_uniform_array_access_to_pull_constants();
 298    void setup_pull_constants();
 299    void invalidate_live_intervals();
 300    void calculate_live_intervals();
 301    bool opt_algebraic();
 302    bool opt_cse();
 303    bool opt_cse_local(bblock_t *block, exec_list *aeb);
 304    bool opt_copy_propagate();
 305    bool try_copy_propagate(fs_inst *inst, int arg, acp_entry *entry);
 306    bool try_constant_propagate(fs_inst *inst, acp_entry *entry);
 307    bool opt_copy_propagate_local(void *mem_ctx, bblock_t *block,
 308                                  exec_list *acp);
 309    bool register_coalesce();
 310    bool register_coalesce_2();
 311    bool compute_to_mrf();
 312    bool dead_code_eliminate();
 313    bool dead_code_eliminate_local();
 314    bool remove_dead_constants();
 315    bool remove_duplicate_mrf_writes();
 316    bool virtual_grf_interferes(int a, int b);
 317    void schedule_instructions(bool post_reg_alloc);
 318    void insert_gen4_send_dependency_workarounds();
 319    void insert_gen4_pre_send_dependency_workarounds(fs_inst *inst);
 320    void insert_gen4_post_send_dependency_workarounds(fs_inst *inst);
 321    void fail(const char *msg, ...);
 322    void lower_uniform_pull_constant_loads();
 323
 324    void push_force_uncompressed();
 325    void pop_force_uncompressed();
 326    void push_force_sechalf();
 327    void pop_force_sechalf();
 328
 329    void emit_dummy_fs();
 330    fs_reg *emit_fragcoord_interpolation(ir_variable *ir);
 331    fs_inst *emit_linterp(const fs_reg &attr, const fs_reg &interp,
 332                          glsl_interp_qualifier interpolation_mode,
 333                          bool is_centroid);
 334    fs_reg *emit_frontfacing_interpolation(ir_variable *ir);
 335    fs_reg *emit_general_interpolation(ir_variable *ir);
 336    void emit_interpolation_setup_gen4();
 337    void emit_interpolation_setup_gen6();
 338    fs_reg rescale_texcoord(ir_texture *ir, fs_reg coordinate,
 339                            bool is_rect, int sampler, int texunit);
 340    fs_inst *emit_texture_gen4(ir_texture *ir, fs_reg dst, fs_reg coordinate,
 341                               fs_reg shadow_comp, fs_reg lod, fs_reg lod2);
 342    fs_inst *emit_texture_gen5(ir_texture *ir, fs_reg dst, fs_reg coordinate,
 343                               fs_reg shadow_comp, fs_reg lod, fs_reg lod2,
 344                               fs_reg sample_index);
 345    fs_inst *emit_texture_gen7(ir_texture *ir, fs_reg dst, fs_reg coordinate,
 346                               fs_reg shadow_comp, fs_reg lod, fs_reg lod2,
 347                               fs_reg sample_index);
 348    fs_reg fix_math_operand(fs_reg src);
 349    fs_inst *emit_math(enum opcode op, fs_reg dst, fs_reg src0);
 350    fs_inst *emit_math(enum opcode op, fs_reg dst, fs_reg src0, fs_reg src1);
 351    void emit_lrp(fs_reg dst, fs_reg x, fs_reg y, fs_reg a);
 352    void emit_minmax(uint32_t conditionalmod, fs_reg dst,
 353                     fs_reg src0, fs_reg src1);
 354    bool try_emit_saturate(ir_expression *ir);
 355    bool try_emit_mad(ir_expression *ir, int mul_arg);
 356    void try_replace_with_sel();
 357    void emit_bool_to_cond_code(ir_rvalue *condition);
 358    void emit_if_gen6(ir_if *ir);
 359    void emit_unspill(fs_inst *inst, fs_reg reg, uint32_t spill_offset,
 360                      int count);
 361
 362    void emit_fragment_program_code();
 363    void setup_fp_regs();
 364    fs_reg get_fp_src_reg(const prog_src_register *src);
 365    fs_reg get_fp_dst_reg(const prog_dst_register *dst);
 366    void emit_fp_alu1(enum opcode opcode,
 367                      const struct prog_instruction *fpi,
 368                      fs_reg dst, fs_reg src);
 369    void emit_fp_alu2(enum opcode opcode,
 370                      const struct prog_instruction *fpi,
 371                      fs_reg dst, fs_reg src0, fs_reg src1);
 372    void emit_fp_scalar_write(const struct prog_instruction *fpi,
 373                              fs_reg dst, fs_reg src);
 374    void emit_fp_scalar_math(enum opcode opcode,
 375                             const struct prog_instruction *fpi,
 376                             fs_reg dst, fs_reg src);
 377
 378    void emit_fp_minmax(const struct prog_instruction *fpi,
 379                        fs_reg dst, fs_reg src0, fs_reg src1);
 380
 381    void emit_fp_sop(uint32_t conditional_mod,
 382                     const struct prog_instruction *fpi,
 383                     fs_reg dst, fs_reg src0, fs_reg src1, fs_reg one);
 384
 385    void emit_color_write(int target, int index, int first_color_mrf);
 386    void emit_fb_writes();
 387
 388    void emit_shader_time_begin();
 389    void emit_shader_time_end();
 390    void emit_shader_time_write(enum shader_time_shader_type type,
 391                                fs_reg value);
 392
 393    bool try_rewrite_rhs_to_dst(ir_assignment *ir,
 394                                fs_reg dst,
 395                                fs_reg src,
 396                                fs_inst *pre_rhs_inst,
 397                                fs_inst *last_rhs_inst);
 398    void emit_assignment_writes(fs_reg &l, fs_reg &r,
 399                                const glsl_type *type, bool predicated);
 400    void resolve_ud_negate(fs_reg *reg);
 401    void resolve_bool_comparison(ir_rvalue *rvalue, fs_reg *reg);
 402
 403    fs_reg get_timestamp();
 404
 405    struct brw_reg interp_reg(int location, int channel);
 406    void setup_uniform_values(ir_variable *ir);
 407    void setup_builtin_uniform_values(ir_variable *ir);
 408    int implied_mrf_writes(fs_inst *inst);
 409
 410    void dump_instruction(backend_instruction *inst);
 411
 412    struct gl_fragment_program *fp;
 413    struct brw_wm_compile *c;
 414    unsigned int sanity_param_count;
 415
 416    int param_size[MAX_UNIFORMS * 4];
 417
 418    int *virtual_grf_sizes;
 419    int virtual_grf_count;
 420    int virtual_grf_array_size;
 421    int *virtual_grf_start;
 422    int *virtual_grf_end;
 423    brw::fs_live_variables *live_intervals;
 424
 425    /* This is the map from UNIFORM hw_reg + reg_offset as generated by
 426     * the visitor to the packed uniform number after
 427     * remove_dead_constants() that represents the actual uploaded
 428     * uniform index.
 429     */
 430    int *params_remap;
 431    int nr_params_remap;
 432
 433    struct hash_table *variable_ht;
 434    fs_reg frag_depth;
 435    fs_reg outputs[BRW_MAX_DRAW_BUFFERS];
 436    unsigned output_components[BRW_MAX_DRAW_BUFFERS];
 437    fs_reg dual_src_output;
 438    int first_non_payload_grf;
 439    /** Either BRW_MAX_GRF or GEN7_MRF_HACK_START */
 440    int max_grf;
 441
 442    fs_reg *fp_temp_regs;
 443    fs_reg *fp_input_regs;
 444
 445    /** @{ debug annotation info */
 446    const char *current_annotation;
 447    const void *base_ir;
 448    /** @} */
 449
 450    bool failed;
 451    char *fail_msg;
 452
 453    /* Result of last visit() method. */
 454    fs_reg result;
 455
 456    fs_reg pixel_x;
 457    fs_reg pixel_y;
 458    fs_reg wpos_w;
 459    fs_reg pixel_w;
 460    fs_reg delta_x[BRW_WM_BARYCENTRIC_INTERP_MODE_COUNT];
 461    fs_reg delta_y[BRW_WM_BARYCENTRIC_INTERP_MODE_COUNT];
 462    fs_reg shader_start_time;
 463
 464    int grf_used;
 465
 466    const unsigned dispatch_width; /**< 8 or 16 */
 467
 468    int force_uncompressed_stack;
 469    int force_sechalf_stack;
 470 };
 471
 472 /**
 473  * The fragment shader code generator.
 474  *
 475  * Translates FS IR to actual i965 assembly code.
 476  */
 477 class fs_generator
 478 {
 479 public:
 480    fs_generator(struct brw_context *brw,
 481                 struct brw_wm_compile *c,
 482                 struct gl_shader_program *prog,
 483                 struct gl_fragment_program *fp,
 484                 bool dual_source_output);
 485    ~fs_generator();
 486
 487    const unsigned *generate_assembly(exec_list *simd8_instructions,
 488                                      exec_list *simd16_instructions,
 489                                      unsigned *assembly_size);
 490
 491 private:
 492    void generate_code(exec_list *instructions);
 493    void generate_fb_write(fs_inst *inst);
 494    void generate_pixel_xy(struct brw_reg dst, bool is_x);
 495    void generate_linterp(fs_inst *inst, struct brw_reg dst,
 496                          struct brw_reg *src);
 497    void generate_tex(fs_inst *inst, struct brw_reg dst, struct brw_reg src);
 498    void generate_math1_gen7(fs_inst *inst,
 499                             struct brw_reg dst,
 500                             struct brw_reg src);
 501    void generate_math2_gen7(fs_inst *inst,
 502                             struct brw_reg dst,
 503                             struct brw_reg src0,
 504                             struct brw_reg src1);
 505    void generate_math1_gen6(fs_inst *inst,
 506                             struct brw_reg dst,
 507                             struct brw_reg src);
 508    void generate_math2_gen6(fs_inst *inst,
 509                             struct brw_reg dst,
 510                             struct brw_reg src0,
 511                             struct brw_reg src1);
 512    void generate_math_gen4(fs_inst *inst,
 513                            struct brw_reg dst,
 514                            struct brw_reg src);
 515    void generate_math_g45(fs_inst *inst,
 516                           struct brw_reg dst,
 517                           struct brw_reg src);
 518    void generate_ddx(fs_inst *inst, struct brw_reg dst, struct brw_reg src);
 519    void generate_ddy(fs_inst *inst, struct brw_reg dst, struct brw_reg src,
 520                      bool negate_value);
 521    void generate_spill(fs_inst *inst, struct brw_reg src);
 522    void generate_unspill(fs_inst *inst, struct brw_reg dst);
 523    void generate_uniform_pull_constant_load(fs_inst *inst, struct brw_reg dst,
 524                                             struct brw_reg index,
 525                                             struct brw_reg offset);
 526    void generate_uniform_pull_constant_load_gen7(fs_inst *inst,
 527                                                  struct brw_reg dst,
 528                                                  struct brw_reg surf_index,
 529                                                  struct brw_reg offset);
 530    void generate_varying_pull_constant_load(fs_inst *inst, struct brw_reg dst,
 531                                             struct brw_reg index,
 532                                             struct brw_reg offset);
 533    void generate_varying_pull_constant_load_gen7(fs_inst *inst,
 534                                                  struct brw_reg dst,
 535                                                  struct brw_reg index,
 536                                                  struct brw_reg offset);
 537    void generate_mov_dispatch_to_flags(fs_inst *inst);
 538    void generate_set_simd4x2_offset(fs_inst *inst,
 539                                     struct brw_reg dst,
 540                                     struct brw_reg offset);
 541    void generate_discard_jump(fs_inst *inst);
 542
 543    void generate_pack_half_2x16_split(fs_inst *inst,
 544                                       struct brw_reg dst,
 545                                       struct brw_reg x,
 546                                       struct brw_reg y);
 547    void generate_unpack_half_2x16_split(fs_inst *inst,
 548                                         struct brw_reg dst,
 549                                         struct brw_reg src);
 550
 551    void generate_shader_time_add(fs_inst *inst,
 552                                  struct brw_reg payload,
 553                                  struct brw_reg offset,
 554                                  struct brw_reg value);
 555
 556    void mark_surface_used(unsigned surf_index);
 557
 558    void patch_discard_jumps_to_fb_writes();
 559
 560    struct brw_context *brw;
 561    struct gl_context *ctx;
 562
 563    struct brw_compile *p;
 564    struct brw_wm_compile *c;
 565
 566    struct gl_shader_program *prog;
 567    struct gl_shader *shader;
 568    const struct gl_fragment_program *fp;
 569
 570    unsigned dispatch_width; /**< 8 or 16 */
 571
 572    exec_list discard_halt_patches;
 573    bool dual_source_output;
 574    void *mem_ctx;
 575 };
 576
 577 bool brw_do_channel_expressions(struct exec_list *instructions);
 578 bool brw_do_vector_splitting(struct exec_list *instructions);
 579 bool brw_fs_precompile(struct gl_context *ctx, struct gl_shader_program *prog);