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
  62 /**
  63   * Registers may be treated as float, signed int or unsigned int.
  64   */
  65 union tgsi_exec_channel
  66 {
  67    float    f[TGSI_QUAD_SIZE];
  68    int      i[TGSI_QUAD_SIZE];
  69    unsigned u[TGSI_QUAD_SIZE];
  70 };
  71
  72 /**
  73   * A vector[RGBA] of channels[4 pixels]
  74   */
  75 struct tgsi_exec_vector
  76 {
  77    union tgsi_exec_channel xyzw[TGSI_NUM_CHANNELS];
  78 };
  79
  80 /**
  81  * For fragment programs, information for computing fragment input
  82  * values from plane equation of the triangle/line.
  83  */
  84 struct tgsi_interp_coef
  85 {
  86    float a0[TGSI_NUM_CHANNELS]; /* in an xyzw layout */
  87    float dadx[TGSI_NUM_CHANNELS];
  88    float dady[TGSI_NUM_CHANNELS];
  89 };
  90
  91 enum tgsi_sampler_control
  92 {
  93    TGSI_SAMPLER_LOD_NONE,
  94    TGSI_SAMPLER_LOD_BIAS,
  95    TGSI_SAMPLER_LOD_EXPLICIT,
  96    TGSI_SAMPLER_LOD_ZERO,
  97    TGSI_SAMPLER_DERIVS_EXPLICIT,
  98    TGSI_SAMPLER_GATHER,
  99 };
 100
 101 struct tgsi_image_params {
 102    unsigned unit;
 103    unsigned tgsi_tex_instr;
 104    enum pipe_format format;
 105    unsigned execmask;
 106 };
 107
 108 struct tgsi_image {
 109    /* image interfaces */
 110    void (*load)(const struct tgsi_image *image,
 111                 const struct tgsi_image_params *params,
 112                 const int s[TGSI_QUAD_SIZE],
 113                 const int t[TGSI_QUAD_SIZE],
 114                 const int r[TGSI_QUAD_SIZE],
 115                 const int sample[TGSI_QUAD_SIZE],
 116                 float rgba[TGSI_NUM_CHANNELS][TGSI_QUAD_SIZE]);
 117
 118    void (*store)(const struct tgsi_image *image,
 119                  const struct tgsi_image_params *params,
 120                  const int s[TGSI_QUAD_SIZE],
 121                  const int t[TGSI_QUAD_SIZE],
 122                  const int r[TGSI_QUAD_SIZE],
 123                  const int sample[TGSI_QUAD_SIZE],
 124                  float rgba[TGSI_NUM_CHANNELS][TGSI_QUAD_SIZE]);
 125
 126    void (*op)(const struct tgsi_image *image,
 127               const struct tgsi_image_params *params,
 128               unsigned opcode,
 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               float rgba2[TGSI_NUM_CHANNELS][TGSI_QUAD_SIZE]);
 135
 136    void (*get_dims)(const struct tgsi_image *image,
 137                     const struct tgsi_image_params *params,
 138                     int dims[4]);
 139 };
 140
 141 struct tgsi_buffer_params {
 142    unsigned unit;
 143    unsigned execmask;
 144    unsigned writemask;
 145 };
 146
 147 struct tgsi_buffer {
 148    /* buffer interfaces */
 149    void (*load)(const struct tgsi_buffer *buffer,
 150                 const struct tgsi_buffer_params *params,
 151                 const int s[TGSI_QUAD_SIZE],
 152                 float rgba[TGSI_NUM_CHANNELS][TGSI_QUAD_SIZE]);
 153
 154    void (*store)(const struct tgsi_buffer *buffer,
 155                  const struct tgsi_buffer_params *params,
 156                  const int s[TGSI_QUAD_SIZE],
 157                  float rgba[TGSI_NUM_CHANNELS][TGSI_QUAD_SIZE]);
 158
 159    void (*op)(const struct tgsi_buffer *buffer,
 160               const struct tgsi_buffer_params *params,
 161               unsigned opcode,
 162               const int s[TGSI_QUAD_SIZE],
 163               float rgba[TGSI_NUM_CHANNELS][TGSI_QUAD_SIZE],
 164               float rgba2[TGSI_NUM_CHANNELS][TGSI_QUAD_SIZE]);
 165
 166    void (*get_dims)(const struct tgsi_buffer *buffer,
 167                     const struct tgsi_buffer_params *params,
 168                     int *dim);
 169 };
 170
 171 /**
 172  * Information for sampling textures, which must be implemented
 173  * by code outside the TGSI executor.
 174  */
 175 struct tgsi_sampler
 176 {
 177    /** Get samples for four fragments in a quad */
 178    /* this interface contains 5 sets of channels that vary
 179     * depending on the sampler.
 180     * s - the first texture coordinate for sampling.
 181     * t - the second texture coordinate for sampling - unused for 1D,
 182           layer for 1D arrays.
 183     * r - the third coordinate for sampling for 3D, cube, cube arrays,
 184     *     layer for 2D arrays. Compare value for 1D/2D shadows.
 185     * c0 - Compare value for shadow cube and shadow 2d arrays,
 186     *      layer for cube arrays.
 187     * derivs - explicit derivatives.
 188     * offset - texel offsets
 189     * lod - lod value, except for shadow cube arrays (compare value there).
 190     */
 191    void (*get_samples)(struct tgsi_sampler *sampler,
 192                        const unsigned sview_index,
 193                        const unsigned sampler_index,
 194                        const float s[TGSI_QUAD_SIZE],
 195                        const float t[TGSI_QUAD_SIZE],
 196                        const float r[TGSI_QUAD_SIZE],
 197                        const float c0[TGSI_QUAD_SIZE],
 198                        const float c1[TGSI_QUAD_SIZE],
 199                        float derivs[3][2][TGSI_QUAD_SIZE],
 200                        const int8_t offset[3],
 201                        enum tgsi_sampler_control control,
 202                        float rgba[TGSI_NUM_CHANNELS][TGSI_QUAD_SIZE]);
 203    void (*get_dims)(struct tgsi_sampler *sampler,
 204                     const unsigned sview_index,
 205                     int level, int dims[4]);
 206    void (*get_texel)(struct tgsi_sampler *sampler,
 207                      const unsigned sview_index,
 208                      const int i[TGSI_QUAD_SIZE],
 209                      const int j[TGSI_QUAD_SIZE], const int k[TGSI_QUAD_SIZE],
 210                      const int lod[TGSI_QUAD_SIZE], const int8_t offset[3],
 211                      float rgba[TGSI_NUM_CHANNELS][TGSI_QUAD_SIZE]);
 212    void (*query_lod)(const struct tgsi_sampler *tgsi_sampler,
 213                      const unsigned sview_index,
 214                      const unsigned sampler_index,
 215                      const float s[TGSI_QUAD_SIZE],
 216                      const float t[TGSI_QUAD_SIZE],
 217                      const float p[TGSI_QUAD_SIZE],
 218                      const float c0[TGSI_QUAD_SIZE],
 219                      const enum tgsi_sampler_control control,
 220                      float mipmap[TGSI_QUAD_SIZE],
 221                      float lod[TGSI_QUAD_SIZE]);
 222 };
 223
 224 #define TGSI_EXEC_NUM_TEMPS       4096
 225 #define TGSI_EXEC_NUM_IMMEDIATES  256
 226
 227 /*
 228  * Locations of various utility registers (_I = Index, _C = Channel)
 229  */
 230 #define TGSI_EXEC_TEMP_00000000_I   (TGSI_EXEC_NUM_TEMPS + 0)
 231 #define TGSI_EXEC_TEMP_00000000_C   0
 232
 233 #define TGSI_EXEC_TEMP_7FFFFFFF_I   (TGSI_EXEC_NUM_TEMPS + 0)
 234 #define TGSI_EXEC_TEMP_7FFFFFFF_C   1
 235
 236 #define TGSI_EXEC_TEMP_80000000_I   (TGSI_EXEC_NUM_TEMPS + 0)
 237 #define TGSI_EXEC_TEMP_80000000_C   2
 238
 239 #define TGSI_EXEC_TEMP_FFFFFFFF_I   (TGSI_EXEC_NUM_TEMPS + 0)
 240 #define TGSI_EXEC_TEMP_FFFFFFFF_C   3
 241
 242 #define TGSI_EXEC_TEMP_ONE_I        (TGSI_EXEC_NUM_TEMPS + 1)
 243 #define TGSI_EXEC_TEMP_ONE_C        0
 244
 245 #define TGSI_EXEC_TEMP_TWO_I        (TGSI_EXEC_NUM_TEMPS + 1)
 246 #define TGSI_EXEC_TEMP_TWO_C        1
 247
 248 #define TGSI_EXEC_TEMP_128_I        (TGSI_EXEC_NUM_TEMPS + 1)
 249 #define TGSI_EXEC_TEMP_128_C        2
 250
 251 #define TGSI_EXEC_TEMP_MINUS_128_I  (TGSI_EXEC_NUM_TEMPS + 1)
 252 #define TGSI_EXEC_TEMP_MINUS_128_C  3
 253
 254 #define TGSI_EXEC_TEMP_KILMASK_I    (TGSI_EXEC_NUM_TEMPS + 2)
 255 #define TGSI_EXEC_TEMP_KILMASK_C    0
 256
 257 #define TGSI_EXEC_TEMP_OUTPUT_I     (TGSI_EXEC_NUM_TEMPS + 2)
 258 #define TGSI_EXEC_TEMP_OUTPUT_C     1
 259
 260 #define TGSI_EXEC_TEMP_PRIMITIVE_I  (TGSI_EXEC_NUM_TEMPS + 2)
 261 #define TGSI_EXEC_TEMP_PRIMITIVE_C  2
 262
 263 #define TGSI_EXEC_TEMP_THREE_I      (TGSI_EXEC_NUM_TEMPS + 2)
 264 #define TGSI_EXEC_TEMP_THREE_C      3
 265
 266 #define TGSI_EXEC_TEMP_HALF_I       (TGSI_EXEC_NUM_TEMPS + 3)
 267 #define TGSI_EXEC_TEMP_HALF_C       0
 268
 269 /* 4 register buffer for various purposes */
 270 #define TGSI_EXEC_TEMP_R0           (TGSI_EXEC_NUM_TEMPS + 4)
 271 #define TGSI_EXEC_NUM_TEMP_R        4
 272
 273 #define TGSI_EXEC_TEMP_ADDR         (TGSI_EXEC_NUM_TEMPS + 8)
 274 #define TGSI_EXEC_NUM_ADDRS         3
 275
 276 #define TGSI_EXEC_NUM_TEMP_EXTRAS   12
 277
 278
 279
 280 #define TGSI_EXEC_MAX_NESTING  32
 281 #define TGSI_EXEC_MAX_COND_NESTING  TGSI_EXEC_MAX_NESTING
 282 #define TGSI_EXEC_MAX_LOOP_NESTING  TGSI_EXEC_MAX_NESTING
 283 #define TGSI_EXEC_MAX_SWITCH_NESTING TGSI_EXEC_MAX_NESTING
 284 #define TGSI_EXEC_MAX_CALL_NESTING  TGSI_EXEC_MAX_NESTING
 285
 286 /* The maximum number of input attributes per vertex. For 2D
 287  * input register files, this is the stride between two 1D
 288  * arrays.
 289  */
 290 #define TGSI_EXEC_MAX_INPUT_ATTRIBS 32
 291
 292 /* The maximum number of bytes per constant buffer.
 293  */
 294 #define TGSI_EXEC_MAX_CONST_BUFFER_SIZE  (4096 * sizeof(float[4]))
 295
 296 /* The maximum number of vertices per primitive */
 297 #define TGSI_MAX_PRIM_VERTICES 6
 298
 299 /* The maximum number of primitives to be generated */
 300 #define TGSI_MAX_PRIMITIVES 64
 301
 302 /* The maximum total number of vertices */
 303 #define TGSI_MAX_TOTAL_VERTICES (TGSI_MAX_PRIM_VERTICES * TGSI_MAX_PRIMITIVES * PIPE_MAX_ATTRIBS)
 304
 305 #define TGSI_MAX_MISC_INPUTS 8
 306
 307 /** function call/activation record */
 308 struct tgsi_call_record
 309 {
 310    uint CondStackTop;
 311    uint LoopStackTop;
 312    uint ContStackTop;
 313    int SwitchStackTop;
 314    int BreakStackTop;
 315    uint ReturnAddr;
 316 };
 317
 318
 319 /* Switch-case block state. */
 320 struct tgsi_switch_record {
 321    uint mask;                          /**< execution mask */
 322    union tgsi_exec_channel selector;   /**< a value case statements are compared to */
 323    uint defaultMask;                   /**< non-execute mask for default case */
 324 };
 325
 326
 327 enum tgsi_break_type {
 328    TGSI_EXEC_BREAK_INSIDE_LOOP,
 329    TGSI_EXEC_BREAK_INSIDE_SWITCH
 330 };
 331
 332
 333 #define TGSI_EXEC_MAX_BREAK_STACK (TGSI_EXEC_MAX_LOOP_NESTING + TGSI_EXEC_MAX_SWITCH_NESTING)
 334
 335
 336 /**
 337  * Run-time virtual machine state for executing TGSI shader.
 338  */
 339 struct tgsi_exec_machine
 340 {
 341    /* Total = program temporaries + internal temporaries
 342     */
 343    struct tgsi_exec_vector       Temps[TGSI_EXEC_NUM_TEMPS +
 344                                        TGSI_EXEC_NUM_TEMP_EXTRAS];
 345
 346    float                         Imms[TGSI_EXEC_NUM_IMMEDIATES][4];
 347
 348    float                         ImmArray[TGSI_EXEC_NUM_IMMEDIATES][4];
 349
 350    struct tgsi_exec_vector       *Inputs;
 351    struct tgsi_exec_vector       *Outputs;
 352
 353    /* System values */
 354    unsigned                      SysSemanticToIndex[TGSI_SEMANTIC_COUNT];
 355    struct tgsi_exec_vector       SystemValue[TGSI_MAX_MISC_INPUTS];
 356
 357    struct tgsi_exec_vector       *Addrs;
 358
 359    struct tgsi_sampler           *Sampler;
 360
 361    struct tgsi_image             *Image;
 362    struct tgsi_buffer            *Buffer;
 363    unsigned                      ImmLimit;
 364
 365    const void *Consts[PIPE_MAX_CONSTANT_BUFFERS];
 366    unsigned ConstsSize[PIPE_MAX_CONSTANT_BUFFERS];
 367
 368    const struct tgsi_token       *Tokens;   /**< Declarations, instructions */
 369    enum pipe_shader_type         ShaderType; /**< PIPE_SHADER_x */
 370
 371    /* GEOMETRY processor only. */
 372    unsigned                      *Primitives;
 373    unsigned                       NumOutputs;
 374    unsigned                       MaxGeometryShaderOutputs;
 375    unsigned                       MaxOutputVertices;
 376
 377    /* FRAGMENT processor only. */
 378    const struct tgsi_interp_coef *InterpCoefs;
 379    struct tgsi_exec_vector       QuadPos;
 380    float                         Face;    /**< +1 if front facing, -1 if back facing */
 381    bool                          flatshade_color;
 382
 383    /* Compute Only */
 384    void                          *LocalMem;
 385    unsigned                      LocalMemSize;
 386
 387    /* See GLSL 4.50 specification for definition of helper invocations */
 388    uint NonHelperMask;  /**< non-helpers */
 389    /* Conditional execution masks */
 390    uint CondMask;  /**< For IF/ELSE/ENDIF */
 391    uint LoopMask;  /**< For BGNLOOP/ENDLOOP */
 392    uint ContMask;  /**< For loop CONT statements */
 393    uint FuncMask;  /**< For function calls */
 394    uint ExecMask;  /**< = CondMask & LoopMask */
 395
 396    /* Current switch-case state. */
 397    struct tgsi_switch_record Switch;
 398
 399    /* Current break type. */
 400    enum tgsi_break_type BreakType;
 401
 402    /** Condition mask stack (for nested conditionals) */
 403    uint CondStack[TGSI_EXEC_MAX_COND_NESTING];
 404    int CondStackTop;
 405
 406    /** Loop mask stack (for nested loops) */
 407    uint LoopStack[TGSI_EXEC_MAX_LOOP_NESTING];
 408    int LoopStackTop;
 409
 410    /** Loop label stack */
 411    uint LoopLabelStack[TGSI_EXEC_MAX_LOOP_NESTING];
 412    int LoopLabelStackTop;
 413
 414    /** Loop continue mask stack (see comments in tgsi_exec.c) */
 415    uint ContStack[TGSI_EXEC_MAX_LOOP_NESTING];
 416    int ContStackTop;
 417
 418    /** Switch case stack */
 419    struct tgsi_switch_record SwitchStack[TGSI_EXEC_MAX_SWITCH_NESTING];
 420    int SwitchStackTop;
 421
 422    enum tgsi_break_type BreakStack[TGSI_EXEC_MAX_BREAK_STACK];
 423    int BreakStackTop;
 424
 425    /** Function execution mask stack (for executing subroutine code) */
 426    uint FuncStack[TGSI_EXEC_MAX_CALL_NESTING];
 427    int FuncStackTop;
 428
 429    /** Function call stack for saving/restoring the program counter */
 430    struct tgsi_call_record CallStack[TGSI_EXEC_MAX_CALL_NESTING];
 431    int CallStackTop;
 432
 433    struct tgsi_full_instruction *Instructions;
 434    uint NumInstructions;
 435
 436    struct tgsi_full_declaration *Declarations;
 437    uint NumDeclarations;
 438
 439    struct tgsi_declaration_sampler_view
 440       SamplerViews[PIPE_MAX_SHADER_SAMPLER_VIEWS];
 441
 442    boolean UsedGeometryShader;
 443
 444    int pc;
 445 };
 446
 447 struct tgsi_exec_machine *
 448 tgsi_exec_machine_create(enum pipe_shader_type shader_type);
 449
 450 void
 451 tgsi_exec_machine_destroy(struct tgsi_exec_machine *mach);
 452
 453
 454 void
 455 tgsi_exec_machine_bind_shader(
 456    struct tgsi_exec_machine *mach,
 457    const struct tgsi_token *tokens,
 458    struct tgsi_sampler *sampler,
 459    struct tgsi_image *image,
 460    struct tgsi_buffer *buffer);
 461
 462 uint
 463 tgsi_exec_machine_run(
 464    struct tgsi_exec_machine *mach, int start_pc );
 465
 466
 467 void
 468 tgsi_exec_machine_free_data(struct tgsi_exec_machine *mach);
 469
 470
 471 boolean
 472 tgsi_check_soa_dependencies(const struct tgsi_full_instruction *inst);
 473
 474
 475 extern void
 476 tgsi_exec_set_constant_buffers(struct tgsi_exec_machine *mach,
 477                                unsigned num_bufs,
 478                                const void **bufs,
 479                                const unsigned *buf_sizes);
 480
 481
 482 static inline int
 483 tgsi_exec_get_shader_param(enum pipe_shader_cap param)
 484 {
 485    switch(param) {
 486    case PIPE_SHADER_CAP_MAX_INSTRUCTIONS:
 487    case PIPE_SHADER_CAP_MAX_ALU_INSTRUCTIONS:
 488    case PIPE_SHADER_CAP_MAX_TEX_INSTRUCTIONS:
 489    case PIPE_SHADER_CAP_MAX_TEX_INDIRECTIONS:
 490       return INT_MAX;
 491    case PIPE_SHADER_CAP_MAX_CONTROL_FLOW_DEPTH:
 492       return TGSI_EXEC_MAX_NESTING;
 493    case PIPE_SHADER_CAP_MAX_INPUTS:
 494       return TGSI_EXEC_MAX_INPUT_ATTRIBS;
 495    case PIPE_SHADER_CAP_MAX_OUTPUTS:
 496       return 32;
 497    case PIPE_SHADER_CAP_MAX_CONST_BUFFER_SIZE:
 498       return TGSI_EXEC_MAX_CONST_BUFFER_SIZE;
 499    case PIPE_SHADER_CAP_MAX_CONST_BUFFERS:
 500       return PIPE_MAX_CONSTANT_BUFFERS;
 501    case PIPE_SHADER_CAP_MAX_TEMPS:
 502       return TGSI_EXEC_NUM_TEMPS;
 503    case PIPE_SHADER_CAP_TGSI_CONT_SUPPORTED:
 504       return 1;
 505    case PIPE_SHADER_CAP_INDIRECT_INPUT_ADDR:
 506    case PIPE_SHADER_CAP_INDIRECT_OUTPUT_ADDR:
 507    case PIPE_SHADER_CAP_INDIRECT_TEMP_ADDR:
 508    case PIPE_SHADER_CAP_INDIRECT_CONST_ADDR:
 509       return 1;
 510    case PIPE_SHADER_CAP_SUBROUTINES:
 511       return 1;
 512    case PIPE_SHADER_CAP_INTEGERS:
 513       return 1;
 514    case PIPE_SHADER_CAP_FP16:
 515       return 0;
 516    case PIPE_SHADER_CAP_MAX_TEXTURE_SAMPLERS:
 517       return PIPE_MAX_SAMPLERS;
 518    case PIPE_SHADER_CAP_MAX_SAMPLER_VIEWS:
 519       return PIPE_MAX_SHADER_SAMPLER_VIEWS;
 520    case PIPE_SHADER_CAP_PREFERRED_IR:
 521       return PIPE_SHADER_IR_TGSI;
 522    case PIPE_SHADER_CAP_SUPPORTED_IRS:
 523       return 1 << PIPE_SHADER_IR_TGSI;
 524    case PIPE_SHADER_CAP_TGSI_SQRT_SUPPORTED:
 525       return 1;
 526    case PIPE_SHADER_CAP_TGSI_DFRACEXP_DLDEXP_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       return 0;
 534    case PIPE_SHADER_CAP_MAX_SHADER_BUFFERS:
 535       return PIPE_MAX_SHADER_BUFFERS;
 536    case PIPE_SHADER_CAP_MAX_SHADER_IMAGES:
 537       return PIPE_MAX_SHADER_IMAGES;
 538
 539    case PIPE_SHADER_CAP_MAX_UNROLL_ITERATIONS_HINT:
 540       return 32;
 541    }
 542    /* if we get here, we missed a shader cap above (and should have seen
 543     * a compiler warning.)
 544     */
 545    return 0;
 546 }
 547
 548 #if defined __cplusplus
 549 } /* extern "C" */
 550 #endif
 551
 552 #endif /* TGSI_EXEC_H */