src/gallium/auxiliary/tgsi/tgsi_exec.h

   1 /**************************************************************************
   2  *
   3  * Copyright 2007-2008 VMware, Inc.
   4  * All Rights Reserved.
   5  * Copyright 2009-2010 VMware, Inc.  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 #ifndef TGSI_EXEC_H
  30 #define TGSI_EXEC_H
  31
  32 #include "pipe/p_compiler.h"
  33 #include "pipe/p_state.h"
  34 #include "pipe/p_shader_tokens.h"
  35
  36 #if defined __cplusplus
  37 extern "C" {
  38 #endif
  39
  40 #define TGSI_CHAN_X 0
  41 #define TGSI_CHAN_Y 1
  42 #define TGSI_CHAN_Z 2
  43 #define TGSI_CHAN_W 3
  44
  45 #define TGSI_NUM_CHANNELS 4  /* R,G,B,A */
  46 #define TGSI_QUAD_SIZE    4  /* 4 pixel/quad */
  47
  48 #define TGSI_FOR_EACH_CHANNEL( CHAN )\
  49    for (CHAN = 0; CHAN < TGSI_NUM_CHANNELS; CHAN++)
  50
  51 #define TGSI_IS_DST0_CHANNEL_ENABLED( INST, CHAN )\
  52    ((INST)->Dst[0].Register.WriteMask & (1 << (CHAN)))
  53
  54 #define TGSI_IF_IS_DST0_CHANNEL_ENABLED( INST, CHAN )\
  55    if (TGSI_IS_DST0_CHANNEL_ENABLED( INST, CHAN ))
  56
  57 #define TGSI_FOR_EACH_DST0_ENABLED_CHANNEL( INST, CHAN )\
  58    TGSI_FOR_EACH_CHANNEL( CHAN )\
  59       TGSI_IF_IS_DST0_CHANNEL_ENABLED( INST, CHAN )
  60
  61 #define TGSI_IS_DST1_CHANNEL_ENABLED( INST, CHAN )\
  62    ((INST)->Dst[1].Register.WriteMask & (1 << (CHAN)))
  63
  64 #define TGSI_IF_IS_DST1_CHANNEL_ENABLED( INST, CHAN )\
  65    if (TGSI_IS_DST1_CHANNEL_ENABLED( INST, CHAN ))
  66
  67 #define TGSI_FOR_EACH_DST1_ENABLED_CHANNEL( INST, CHAN )\
  68    TGSI_FOR_EACH_CHANNEL( CHAN )\
  69       TGSI_IF_IS_DST1_CHANNEL_ENABLED( INST, CHAN )
  70
  71 /**
  72   * Registers may be treated as float, signed int or unsigned int.
  73   */
  74 union tgsi_exec_channel
  75 {
  76    float    f[TGSI_QUAD_SIZE];
  77    int      i[TGSI_QUAD_SIZE];
  78    unsigned u[TGSI_QUAD_SIZE];
  79 };
  80
  81 /**
  82   * A vector[RGBA] of channels[4 pixels]
  83   */
  84 struct tgsi_exec_vector
  85 {
  86    union tgsi_exec_channel xyzw[TGSI_NUM_CHANNELS];
  87 };
  88
  89 /**
  90  * For fragment programs, information for computing fragment input
  91  * values from plane equation of the triangle/line.
  92  */
  93 struct tgsi_interp_coef
  94 {
  95    float a0[TGSI_NUM_CHANNELS]; /* in an xyzw layout */
  96    float dadx[TGSI_NUM_CHANNELS];
  97    float dady[TGSI_NUM_CHANNELS];
  98 };
  99
 100 enum tgsi_sampler_control
 101 {
 102    TGSI_SAMPLER_LOD_NONE,
 103    TGSI_SAMPLER_LOD_BIAS,
 104    TGSI_SAMPLER_LOD_EXPLICIT,
 105    TGSI_SAMPLER_LOD_ZERO,
 106    TGSI_SAMPLER_DERIVS_EXPLICIT,
 107    TGSI_SAMPLER_GATHER,
 108 };
 109
 110 struct tgsi_image_params {
 111    unsigned unit;
 112    unsigned tgsi_tex_instr;
 113    enum pipe_format format;
 114    unsigned execmask;
 115 };
 116
 117 struct tgsi_image {
 118    /* image interfaces */
 119    void (*load)(const struct tgsi_image *image,
 120                 const struct tgsi_image_params *params,
 121                 const int s[TGSI_QUAD_SIZE],
 122                 const int t[TGSI_QUAD_SIZE],
 123                 const int r[TGSI_QUAD_SIZE],
 124                 const int sample[TGSI_QUAD_SIZE],
 125                 float rgba[TGSI_NUM_CHANNELS][TGSI_QUAD_SIZE]);
 126
 127    void (*store)(const struct tgsi_image *image,
 128                  const struct tgsi_image_params *params,
 129                  const int s[TGSI_QUAD_SIZE],
 130                  const int t[TGSI_QUAD_SIZE],
 131                  const int r[TGSI_QUAD_SIZE],
 132                  const int sample[TGSI_QUAD_SIZE],
 133                  float rgba[TGSI_NUM_CHANNELS][TGSI_QUAD_SIZE]);
 134
 135    void (*op)(const struct tgsi_image *image,
 136               const struct tgsi_image_params *params,
 137               enum tgsi_opcode opcode,
 138               const int s[TGSI_QUAD_SIZE],
 139               const int t[TGSI_QUAD_SIZE],
 140               const int r[TGSI_QUAD_SIZE],
 141               const int sample[TGSI_QUAD_SIZE],
 142               float rgba[TGSI_NUM_CHANNELS][TGSI_QUAD_SIZE],
 143               float rgba2[TGSI_NUM_CHANNELS][TGSI_QUAD_SIZE]);
 144
 145    void (*get_dims)(const struct tgsi_image *image,
 146                     const struct tgsi_image_params *params,
 147                     int dims[4]);
 148 };
 149
 150 struct tgsi_buffer_params {
 151    unsigned unit;
 152    unsigned execmask;
 153    unsigned writemask;
 154 };
 155
 156 struct tgsi_buffer {
 157    /* buffer interfaces */
 158    void (*load)(const struct tgsi_buffer *buffer,
 159                 const struct tgsi_buffer_params *params,
 160                 const int s[TGSI_QUAD_SIZE],
 161                 float rgba[TGSI_NUM_CHANNELS][TGSI_QUAD_SIZE]);
 162
 163    void (*store)(const struct tgsi_buffer *buffer,
 164                  const struct tgsi_buffer_params *params,
 165                  const int s[TGSI_QUAD_SIZE],
 166                  float rgba[TGSI_NUM_CHANNELS][TGSI_QUAD_SIZE]);
 167
 168    void (*op)(const struct tgsi_buffer *buffer,
 169               const struct tgsi_buffer_params *params,
 170               enum tgsi_opcode opcode,
 171               const int s[TGSI_QUAD_SIZE],
 172               float rgba[TGSI_NUM_CHANNELS][TGSI_QUAD_SIZE],
 173               float rgba2[TGSI_NUM_CHANNELS][TGSI_QUAD_SIZE]);
 174
 175    void (*get_dims)(const struct tgsi_buffer *buffer,
 176                     const struct tgsi_buffer_params *params,
 177                     int *dim);
 178 };
 179
 180 /**
 181  * Information for sampling textures, which must be implemented
 182  * by code outside the TGSI executor.
 183  */
 184 struct tgsi_sampler
 185 {
 186    /** Get samples for four fragments in a quad */
 187    /* this interface contains 5 sets of channels that vary
 188     * depending on the sampler.
 189     * s - the first texture coordinate for sampling.
 190     * t - the second texture coordinate for sampling - unused for 1D,
 191           layer for 1D arrays.
 192     * r - the third coordinate for sampling for 3D, cube, cube arrays,
 193     *     layer for 2D arrays. Compare value for 1D/2D shadows.
 194     * c0 - Compare value for shadow cube and shadow 2d arrays,
 195     *      layer for cube arrays.
 196     * derivs - explicit derivatives.
 197     * offset - texel offsets
 198     * lod - lod value, except for shadow cube arrays (compare value there).
 199     */
 200    void (*get_samples)(struct tgsi_sampler *sampler,
 201                        const unsigned sview_index,
 202                        const unsigned sampler_index,
 203                        const float s[TGSI_QUAD_SIZE],
 204                        const float t[TGSI_QUAD_SIZE],
 205                        const float r[TGSI_QUAD_SIZE],
 206                        const float c0[TGSI_QUAD_SIZE],
 207                        const float c1[TGSI_QUAD_SIZE],
 208                        float derivs[3][2][TGSI_QUAD_SIZE],
 209                        const int8_t offset[3],
 210                        enum tgsi_sampler_control control,
 211                        float rgba[TGSI_NUM_CHANNELS][TGSI_QUAD_SIZE]);
 212    void (*get_dims)(struct tgsi_sampler *sampler,
 213                     const unsigned sview_index,
 214                     int level, int dims[4]);
 215    void (*get_texel)(struct tgsi_sampler *sampler,
 216                      const unsigned sview_index,
 217                      const int i[TGSI_QUAD_SIZE],
 218                      const int j[TGSI_QUAD_SIZE], const int k[TGSI_QUAD_SIZE],
 219                      const int lod[TGSI_QUAD_SIZE], const int8_t offset[3],
 220                      float rgba[TGSI_NUM_CHANNELS][TGSI_QUAD_SIZE]);
 221    void (*query_lod)(const struct tgsi_sampler *tgsi_sampler,
 222                      const unsigned sview_index,
 223                      const unsigned sampler_index,
 224                      const float s[TGSI_QUAD_SIZE],
 225                      const float t[TGSI_QUAD_SIZE],
 226                      const float p[TGSI_QUAD_SIZE],
 227                      const float c0[TGSI_QUAD_SIZE],
 228                      const enum tgsi_sampler_control control,
 229                      float mipmap[TGSI_QUAD_SIZE],
 230                      float lod[TGSI_QUAD_SIZE]);
 231 };
 232
 233 #define TGSI_EXEC_NUM_TEMPS       4096
 234
 235 /*
 236  * Locations of various utility registers (_I = Index, _C = Channel)
 237  */
 238 #define TGSI_EXEC_TEMP_KILMASK_I    (TGSI_EXEC_NUM_TEMPS + 0)
 239 #define TGSI_EXEC_TEMP_KILMASK_C    0
 240
 241 #define TGSI_EXEC_TEMP_OUTPUT_I     (TGSI_EXEC_NUM_TEMPS + 0)
 242 #define TGSI_EXEC_TEMP_OUTPUT_C     1
 243
 244 #define TGSI_EXEC_TEMP_PRIMITIVE_I  (TGSI_EXEC_NUM_TEMPS + 0)
 245 #define TGSI_EXEC_TEMP_PRIMITIVE_C  2
 246
 247 /* 4 register buffer for various purposes */
 248 #define TGSI_EXEC_TEMP_R0           (TGSI_EXEC_NUM_TEMPS + 1)
 249 #define TGSI_EXEC_NUM_TEMP_R        4
 250
 251 #define TGSI_EXEC_TEMP_ADDR         (TGSI_EXEC_NUM_TEMPS + 5)
 252 #define TGSI_EXEC_NUM_ADDRS         3
 253
 254 #define TGSI_EXEC_TEMP_PRIMITIVE_S1_I  (TGSI_EXEC_NUM_TEMPS + 8)
 255 #define TGSI_EXEC_TEMP_PRIMITIVE_S1_C  0
 256 #define TGSI_EXEC_TEMP_PRIMITIVE_S2_I  (TGSI_EXEC_NUM_TEMPS + 9)
 257 #define TGSI_EXEC_TEMP_PRIMITIVE_S2_C  1
 258 #define TGSI_EXEC_TEMP_PRIMITIVE_S3_I  (TGSI_EXEC_NUM_TEMPS + 10)
 259 #define TGSI_EXEC_TEMP_PRIMITIVE_S3_C  2
 260
 261 #define TGSI_EXEC_NUM_TEMP_EXTRAS   11
 262
 263
 264
 265 #define TGSI_EXEC_MAX_NESTING  32
 266 #define TGSI_EXEC_MAX_COND_NESTING  TGSI_EXEC_MAX_NESTING
 267 #define TGSI_EXEC_MAX_LOOP_NESTING  TGSI_EXEC_MAX_NESTING
 268 #define TGSI_EXEC_MAX_SWITCH_NESTING TGSI_EXEC_MAX_NESTING
 269 #define TGSI_EXEC_MAX_CALL_NESTING  TGSI_EXEC_MAX_NESTING
 270
 271 /* The maximum number of input attributes per vertex. For 2D
 272  * input register files, this is the stride between two 1D
 273  * arrays.
 274  */
 275 #define TGSI_EXEC_MAX_INPUT_ATTRIBS 32
 276
 277 /* The maximum number of bytes per constant buffer.
 278  */
 279 #define TGSI_EXEC_MAX_CONST_BUFFER_SIZE  (4096 * sizeof(float[4]))
 280
 281 /* The maximum number of vertices per primitive */
 282 #define TGSI_MAX_PRIM_VERTICES 6
 283
 284 /* The maximum number of primitives to be generated */
 285 #define TGSI_MAX_PRIMITIVES 64
 286
 287 /* The maximum total number of vertices */
 288 #define TGSI_MAX_TOTAL_VERTICES (TGSI_MAX_PRIM_VERTICES * TGSI_MAX_PRIMITIVES * PIPE_MAX_ATTRIBS)
 289
 290 #define TGSI_MAX_MISC_INPUTS 8
 291
 292 #define TGSI_MAX_VERTEX_STREAMS 4
 293
 294 /** function call/activation record */
 295 struct tgsi_call_record
 296 {
 297    uint CondStackTop;
 298    uint LoopStackTop;
 299    uint ContStackTop;
 300    int SwitchStackTop;
 301    int BreakStackTop;
 302    uint ReturnAddr;
 303 };
 304
 305
 306 /* Switch-case block state. */
 307 struct tgsi_switch_record {
 308    uint mask;                          /**< execution mask */
 309    union tgsi_exec_channel selector;   /**< a value case statements are compared to */
 310    uint defaultMask;                   /**< non-execute mask for default case */
 311 };
 312
 313
 314 enum tgsi_break_type {
 315    TGSI_EXEC_BREAK_INSIDE_LOOP,
 316    TGSI_EXEC_BREAK_INSIDE_SWITCH
 317 };
 318
 319
 320 #define TGSI_EXEC_MAX_BREAK_STACK (TGSI_EXEC_MAX_LOOP_NESTING + TGSI_EXEC_MAX_SWITCH_NESTING)
 321
 322 typedef float float4[4];
 323
 324 struct tgsi_exec_machine;
 325
 326 typedef void (* apply_sample_offset_func)(
 327    const struct tgsi_exec_machine *mach,
 328    unsigned attrib,
 329    unsigned chan,
 330    float ofs_x,
 331    float ofs_y,
 332    union tgsi_exec_channel *out_chan);
 333
 334 /**
 335  * Run-time virtual machine state for executing TGSI shader.
 336  */
 337 struct tgsi_exec_machine
 338 {
 339    /* Total = program temporaries + internal temporaries
 340     */
 341    struct tgsi_exec_vector       Temps[TGSI_EXEC_NUM_TEMPS +
 342                                        TGSI_EXEC_NUM_TEMP_EXTRAS];
 343
 344    unsigned                       ImmsReserved;
 345    float4                         *Imms;
 346
 347    struct tgsi_exec_vector       *Inputs;
 348    struct tgsi_exec_vector       *Outputs;
 349    apply_sample_offset_func           *InputSampleOffsetApply;
 350
 351    /* System values */
 352    unsigned                      SysSemanticToIndex[TGSI_SEMANTIC_COUNT];
 353    struct tgsi_exec_vector       SystemValue[TGSI_MAX_MISC_INPUTS];
 354
 355    struct tgsi_exec_vector       *Addrs;
 356
 357    struct tgsi_sampler           *Sampler;
 358
 359    struct tgsi_image             *Image;
 360    struct tgsi_buffer            *Buffer;
 361    unsigned                      ImmLimit;
 362
 363    const void *Consts[PIPE_MAX_CONSTANT_BUFFERS];
 364    unsigned ConstsSize[PIPE_MAX_CONSTANT_BUFFERS];
 365
 366    const struct tgsi_token       *Tokens;   /**< Declarations, instructions */
 367    enum pipe_shader_type         ShaderType; /**< PIPE_SHADER_x */
 368
 369    /* GEOMETRY processor only. */
 370    unsigned                      *Primitives[TGSI_MAX_VERTEX_STREAMS];
 371    unsigned                      *PrimitiveOffsets[TGSI_MAX_VERTEX_STREAMS];
 372    unsigned                       NumOutputs;
 373    unsigned                       MaxGeometryShaderOutputs;
 374    unsigned                       MaxOutputVertices;
 375
 376    /* FRAGMENT processor only. */
 377    const struct tgsi_interp_coef *InterpCoefs;
 378    struct tgsi_exec_vector       QuadPos;
 379    float                         Face;    /**< +1 if front facing, -1 if back facing */
 380    bool                          flatshade_color;
 381
 382    /* Compute Only */
 383    void                          *LocalMem;
 384    unsigned                      LocalMemSize;
 385
 386    /* See GLSL 4.50 specification for definition of helper invocations */
 387    uint NonHelperMask;  /**< non-helpers */
 388    /* Conditional execution masks */
 389    uint CondMask;  /**< For IF/ELSE/ENDIF */
 390    uint LoopMask;  /**< For BGNLOOP/ENDLOOP */
 391    uint ContMask;  /**< For loop CONT statements */
 392    uint FuncMask;  /**< For function calls */
 393    uint ExecMask;  /**< = CondMask & LoopMask */
 394
 395    /* Current switch-case state. */
 396    struct tgsi_switch_record Switch;
 397
 398    /* Current break type. */
 399    enum tgsi_break_type BreakType;
 400
 401    /** Condition mask stack (for nested conditionals) */
 402    uint CondStack[TGSI_EXEC_MAX_COND_NESTING];
 403    int CondStackTop;
 404
 405    /** Loop mask stack (for nested loops) */
 406    uint LoopStack[TGSI_EXEC_MAX_LOOP_NESTING];
 407    int LoopStackTop;
 408
 409    /** Loop label stack */
 410    uint LoopLabelStack[TGSI_EXEC_MAX_LOOP_NESTING];
 411    int LoopLabelStackTop;
 412
 413    /** Loop continue mask stack (see comments in tgsi_exec.c) */
 414    uint ContStack[TGSI_EXEC_MAX_LOOP_NESTING];
 415    int ContStackTop;
 416
 417    /** Switch case stack */
 418    struct tgsi_switch_record SwitchStack[TGSI_EXEC_MAX_SWITCH_NESTING];
 419    int SwitchStackTop;
 420
 421    enum tgsi_break_type BreakStack[TGSI_EXEC_MAX_BREAK_STACK];
 422    int BreakStackTop;
 423
 424    /** Function execution mask stack (for executing subroutine code) */
 425    uint FuncStack[TGSI_EXEC_MAX_CALL_NESTING];
 426    int FuncStackTop;
 427
 428    /** Function call stack for saving/restoring the program counter */
 429    struct tgsi_call_record CallStack[TGSI_EXEC_MAX_CALL_NESTING];
 430    int CallStackTop;
 431
 432    struct tgsi_full_instruction *Instructions;
 433    uint NumInstructions;
 434
 435    struct tgsi_full_declaration *Declarations;
 436    uint NumDeclarations;
 437
 438    struct tgsi_declaration_sampler_view
 439       SamplerViews[PIPE_MAX_SHADER_SAMPLER_VIEWS];
 440
 441    boolean UsedGeometryShader;
 442
 443    int pc;
 444 };
 445
 446 struct tgsi_exec_machine *
 447 tgsi_exec_machine_create(enum pipe_shader_type shader_type);
 448
 449 void
 450 tgsi_exec_machine_destroy(struct tgsi_exec_machine *mach);
 451
 452
 453 void
 454 tgsi_exec_machine_bind_shader(
 455    struct tgsi_exec_machine *mach,
 456    const struct tgsi_token *tokens,
 457    struct tgsi_sampler *sampler,
 458    struct tgsi_image *image,
 459    struct tgsi_buffer *buffer);
 460
 461 uint
 462 tgsi_exec_machine_run(
 463    struct tgsi_exec_machine *mach, int start_pc );
 464
 465
 466 void
 467 tgsi_exec_machine_free_data(struct tgsi_exec_machine *mach);
 468
 469
 470 extern void
 471 tgsi_exec_set_constant_buffers(struct tgsi_exec_machine *mach,
 472                                unsigned num_bufs,
 473                                const void **bufs,
 474                                const unsigned *buf_sizes);
 475
 476
 477 static inline int
 478 tgsi_exec_get_shader_param(enum pipe_shader_cap param)
 479 {
 480    switch(param) {
 481    case PIPE_SHADER_CAP_MAX_INSTRUCTIONS:
 482    case PIPE_SHADER_CAP_MAX_ALU_INSTRUCTIONS:
 483    case PIPE_SHADER_CAP_MAX_TEX_INSTRUCTIONS:
 484    case PIPE_SHADER_CAP_MAX_TEX_INDIRECTIONS:
 485       return INT_MAX;
 486    case PIPE_SHADER_CAP_MAX_CONTROL_FLOW_DEPTH:
 487       return TGSI_EXEC_MAX_NESTING;
 488    case PIPE_SHADER_CAP_MAX_INPUTS:
 489       return TGSI_EXEC_MAX_INPUT_ATTRIBS;
 490    case PIPE_SHADER_CAP_MAX_OUTPUTS:
 491       return 32;
 492    case PIPE_SHADER_CAP_MAX_CONST_BUFFER_SIZE:
 493       return TGSI_EXEC_MAX_CONST_BUFFER_SIZE;
 494    case PIPE_SHADER_CAP_MAX_CONST_BUFFERS:
 495       return PIPE_MAX_CONSTANT_BUFFERS;
 496    case PIPE_SHADER_CAP_MAX_TEMPS:
 497       return TGSI_EXEC_NUM_TEMPS;
 498    case PIPE_SHADER_CAP_TGSI_CONT_SUPPORTED:
 499       return 1;
 500    case PIPE_SHADER_CAP_INDIRECT_INPUT_ADDR:
 501    case PIPE_SHADER_CAP_INDIRECT_OUTPUT_ADDR:
 502    case PIPE_SHADER_CAP_INDIRECT_TEMP_ADDR:
 503    case PIPE_SHADER_CAP_INDIRECT_CONST_ADDR:
 504       return 1;
 505    case PIPE_SHADER_CAP_SUBROUTINES:
 506       return 1;
 507    case PIPE_SHADER_CAP_INTEGERS:
 508       return 1;
 509    case PIPE_SHADER_CAP_INT64_ATOMICS:
 510    case PIPE_SHADER_CAP_FP16:
 511    case PIPE_SHADER_CAP_FP16_DERIVATIVES:
 512    case PIPE_SHADER_CAP_INT16:
 513    case PIPE_SHADER_CAP_GLSL_16BIT_CONSTS:
 514       return 0;
 515    case PIPE_SHADER_CAP_MAX_TEXTURE_SAMPLERS:
 516       return PIPE_MAX_SAMPLERS;
 517    case PIPE_SHADER_CAP_MAX_SAMPLER_VIEWS:
 518       return PIPE_MAX_SHADER_SAMPLER_VIEWS;
 519    case PIPE_SHADER_CAP_PREFERRED_IR:
 520       return PIPE_SHADER_IR_TGSI;
 521    case PIPE_SHADER_CAP_SUPPORTED_IRS:
 522       return 1 << PIPE_SHADER_IR_TGSI;
 523    case PIPE_SHADER_CAP_TGSI_SQRT_SUPPORTED:
 524       return 1;
 525    case PIPE_SHADER_CAP_TGSI_DFRACEXP_DLDEXP_SUPPORTED:
 526    case PIPE_SHADER_CAP_TGSI_LDEXP_SUPPORTED:
 527    case PIPE_SHADER_CAP_TGSI_ANY_INOUT_DECL_RANGE:
 528       return 1;
 529    case PIPE_SHADER_CAP_TGSI_DROUND_SUPPORTED:
 530    case PIPE_SHADER_CAP_TGSI_FMA_SUPPORTED:
 531    case PIPE_SHADER_CAP_LOWER_IF_THRESHOLD:
 532    case PIPE_SHADER_CAP_TGSI_SKIP_MERGE_REGISTERS:
 533    case PIPE_SHADER_CAP_MAX_HW_ATOMIC_COUNTERS:
 534    case PIPE_SHADER_CAP_MAX_HW_ATOMIC_COUNTER_BUFFERS:
 535       return 0;
 536    case PIPE_SHADER_CAP_MAX_SHADER_BUFFERS:
 537       return PIPE_MAX_SHADER_BUFFERS;
 538    case PIPE_SHADER_CAP_MAX_SHADER_IMAGES:
 539       return PIPE_MAX_SHADER_IMAGES;
 540
 541    case PIPE_SHADER_CAP_MAX_UNROLL_ITERATIONS_HINT:
 542       return 32;
 543    }
 544    /* if we get here, we missed a shader cap above (and should have seen
 545     * a compiler warning.)
 546     */
 547    return 0;
 548 }
 549
 550 #if defined __cplusplus
 551 } /* extern "C" */
 552 #endif
 553
 554 #endif /* TGSI_EXEC_H */