src/gallium/auxiliary/tgsi/tgsi_exec.h

   1 /**************************************************************************
   2  *
   3  * Copyright 2007-2008 Tungsten Graphics, Inc., Cedar Park, Texas.
   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 TUNGSTEN GRAPHICS 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
  41 #define NUM_CHANNELS 4  /* R,G,B,A */
  42 #define QUAD_SIZE    4  /* 4 pixel/quad */
  43
  44
  45 /**
  46   * Registers may be treated as float, signed int or unsigned int.
  47   */
  48 union tgsi_exec_channel
  49 {
  50    float    f[QUAD_SIZE];
  51    int      i[QUAD_SIZE];
  52    unsigned u[QUAD_SIZE];
  53 };
  54
  55 /**
  56   * A vector[RGBA] of channels[4 pixels]
  57   */
  58 struct tgsi_exec_vector
  59 {
  60    union tgsi_exec_channel xyzw[NUM_CHANNELS];
  61 };
  62
  63 /**
  64  * For fragment programs, information for computing fragment input
  65  * values from plane equation of the triangle/line.
  66  */
  67 struct tgsi_interp_coef
  68 {
  69    float a0[NUM_CHANNELS];      /* in an xyzw layout */
  70    float dadx[NUM_CHANNELS];
  71    float dady[NUM_CHANNELS];
  72 };
  73
  74 enum tgsi_sampler_control {
  75    tgsi_sampler_lod_bias,
  76    tgsi_sampler_lod_explicit
  77 };
  78
  79 /**
  80  * Information for sampling textures, which must be implemented
  81  * by code outside the TGSI executor.
  82  */
  83 struct tgsi_sampler
  84 {
  85    /** Get samples for four fragments in a quad */
  86    void (*get_samples)(struct tgsi_sampler *sampler,
  87                        const float s[QUAD_SIZE],
  88                        const float t[QUAD_SIZE],
  89                        const float p[QUAD_SIZE],
  90                        const float c0[QUAD_SIZE],
  91                        enum tgsi_sampler_control control,
  92                        float rgba[NUM_CHANNELS][QUAD_SIZE]);
  93 };
  94
  95 #define TGSI_EXEC_NUM_TEMPS       128
  96 #define TGSI_EXEC_NUM_IMMEDIATES  256
  97 #define TGSI_EXEC_NUM_TEMP_ARRAYS 8
  98
  99 /*
 100  * Locations of various utility registers (_I = Index, _C = Channel)
 101  */
 102 #define TGSI_EXEC_TEMP_00000000_I   (TGSI_EXEC_NUM_TEMPS + 0)
 103 #define TGSI_EXEC_TEMP_00000000_C   0
 104
 105 #define TGSI_EXEC_TEMP_7FFFFFFF_I   (TGSI_EXEC_NUM_TEMPS + 0)
 106 #define TGSI_EXEC_TEMP_7FFFFFFF_C   1
 107
 108 #define TGSI_EXEC_TEMP_80000000_I   (TGSI_EXEC_NUM_TEMPS + 0)
 109 #define TGSI_EXEC_TEMP_80000000_C   2
 110
 111 #define TGSI_EXEC_TEMP_FFFFFFFF_I   (TGSI_EXEC_NUM_TEMPS + 0)
 112 #define TGSI_EXEC_TEMP_FFFFFFFF_C   3
 113
 114 #define TGSI_EXEC_TEMP_ONE_I        (TGSI_EXEC_NUM_TEMPS + 1)
 115 #define TGSI_EXEC_TEMP_ONE_C        0
 116
 117 #define TGSI_EXEC_TEMP_TWO_I        (TGSI_EXEC_NUM_TEMPS + 1)
 118 #define TGSI_EXEC_TEMP_TWO_C        1
 119
 120 #define TGSI_EXEC_TEMP_128_I        (TGSI_EXEC_NUM_TEMPS + 1)
 121 #define TGSI_EXEC_TEMP_128_C        2
 122
 123 #define TGSI_EXEC_TEMP_MINUS_128_I  (TGSI_EXEC_NUM_TEMPS + 1)
 124 #define TGSI_EXEC_TEMP_MINUS_128_C  3
 125
 126 #define TGSI_EXEC_TEMP_KILMASK_I    (TGSI_EXEC_NUM_TEMPS + 2)
 127 #define TGSI_EXEC_TEMP_KILMASK_C    0
 128
 129 #define TGSI_EXEC_TEMP_OUTPUT_I     (TGSI_EXEC_NUM_TEMPS + 2)
 130 #define TGSI_EXEC_TEMP_OUTPUT_C     1
 131
 132 #define TGSI_EXEC_TEMP_PRIMITIVE_I  (TGSI_EXEC_NUM_TEMPS + 2)
 133 #define TGSI_EXEC_TEMP_PRIMITIVE_C  2
 134
 135 #define TGSI_EXEC_TEMP_THREE_I      (TGSI_EXEC_NUM_TEMPS + 2)
 136 #define TGSI_EXEC_TEMP_THREE_C      3
 137
 138 #define TGSI_EXEC_TEMP_HALF_I       (TGSI_EXEC_NUM_TEMPS + 3)
 139 #define TGSI_EXEC_TEMP_HALF_C       0
 140
 141 /* execution mask, each value is either 0 or ~0 */
 142 #define TGSI_EXEC_MASK_I            (TGSI_EXEC_NUM_TEMPS + 3)
 143 #define TGSI_EXEC_MASK_C            1
 144
 145 /* 4 register buffer for various purposes */
 146 #define TGSI_EXEC_TEMP_R0           (TGSI_EXEC_NUM_TEMPS + 4)
 147 #define TGSI_EXEC_NUM_TEMP_R        4
 148
 149 #define TGSI_EXEC_TEMP_ADDR         (TGSI_EXEC_NUM_TEMPS + 8)
 150 #define TGSI_EXEC_NUM_ADDRS         1
 151
 152 /* predicate register */
 153 #define TGSI_EXEC_TEMP_P0           (TGSI_EXEC_NUM_TEMPS + 9)
 154 #define TGSI_EXEC_NUM_PREDS         1
 155
 156 #define TGSI_EXEC_NUM_TEMP_EXTRAS   10
 157
 158
 159
 160 #define TGSI_EXEC_MAX_NESTING  32
 161 #define TGSI_EXEC_MAX_COND_NESTING  TGSI_EXEC_MAX_NESTING
 162 #define TGSI_EXEC_MAX_LOOP_NESTING  TGSI_EXEC_MAX_NESTING
 163 #define TGSI_EXEC_MAX_SWITCH_NESTING TGSI_EXEC_MAX_NESTING
 164 #define TGSI_EXEC_MAX_CALL_NESTING  TGSI_EXEC_MAX_NESTING
 165
 166 /* The maximum number of input attributes per vertex. For 2D
 167  * input register files, this is the stride between two 1D
 168  * arrays.
 169  */
 170 #define TGSI_EXEC_MAX_INPUT_ATTRIBS 17
 171
 172 /* The maximum number of constant vectors per constant buffer.
 173  */
 174 #define TGSI_EXEC_MAX_CONST_BUFFER  4096
 175
 176 /* The maximum number of vertices per primitive */
 177 #define TGSI_MAX_PRIM_VERTICES 6
 178
 179 /* The maximum number of primitives to be generated */
 180 #define TGSI_MAX_PRIMITIVES 64
 181
 182 /* The maximum total number of vertices */
 183 #define TGSI_MAX_TOTAL_VERTICES (TGSI_MAX_PRIM_VERTICES * TGSI_MAX_PRIMITIVES * PIPE_MAX_ATTRIBS)
 184
 185 #define TGSI_MAX_MISC_INPUTS 8
 186
 187 /** function call/activation record */
 188 struct tgsi_call_record
 189 {
 190    uint CondStackTop;
 191    uint LoopStackTop;
 192    uint ContStackTop;
 193    int SwitchStackTop;
 194    int BreakStackTop;
 195    uint ReturnAddr;
 196 };
 197
 198
 199 /* Switch-case block state. */
 200 struct tgsi_switch_record {
 201    uint mask;                          /**< execution mask */
 202    union tgsi_exec_channel selector;   /**< a value case statements are compared to */
 203    uint defaultMask;                   /**< non-execute mask for default case */
 204 };
 205
 206
 207 enum tgsi_break_type {
 208    TGSI_EXEC_BREAK_INSIDE_LOOP,
 209    TGSI_EXEC_BREAK_INSIDE_SWITCH
 210 };
 211
 212
 213 #define TGSI_EXEC_MAX_BREAK_STACK (TGSI_EXEC_MAX_LOOP_NESTING + TGSI_EXEC_MAX_SWITCH_NESTING)
 214
 215
 216 /**
 217  * Run-time virtual machine state for executing TGSI shader.
 218  */
 219 struct tgsi_exec_machine
 220 {
 221    /* Total = program temporaries + internal temporaries
 222     */
 223    struct tgsi_exec_vector       Temps[TGSI_EXEC_NUM_TEMPS +
 224                                        TGSI_EXEC_NUM_TEMP_EXTRAS];
 225    struct tgsi_exec_vector       TempArray[TGSI_EXEC_NUM_TEMP_ARRAYS][TGSI_EXEC_NUM_TEMPS];
 226
 227    float                         Imms[TGSI_EXEC_NUM_IMMEDIATES][4];
 228
 229    float                         ImmArray[TGSI_EXEC_NUM_IMMEDIATES][4];
 230
 231    struct tgsi_exec_vector       *Inputs;
 232    struct tgsi_exec_vector       *Outputs;
 233
 234    /* System values */
 235    unsigned                      SysSemanticToIndex[TGSI_SEMANTIC_COUNT];
 236    float                         SystemValue[TGSI_MAX_MISC_INPUTS][4];
 237
 238    struct tgsi_exec_vector       *Addrs;
 239    struct tgsi_exec_vector       *Predicates;
 240
 241    struct tgsi_sampler           **Samplers;
 242
 243    unsigned                      ImmLimit;
 244
 245    const void *Consts[PIPE_MAX_CONSTANT_BUFFERS];
 246    unsigned ConstsSize[PIPE_MAX_CONSTANT_BUFFERS];
 247
 248    const struct tgsi_token       *Tokens;   /**< Declarations, instructions */
 249    unsigned                      Processor; /**< TGSI_PROCESSOR_x */
 250
 251    /* GEOMETRY processor only. */
 252    unsigned                      *Primitives;
 253    unsigned                       NumOutputs;
 254    unsigned                       MaxGeometryShaderOutputs;
 255
 256    /* FRAGMENT processor only. */
 257    const struct tgsi_interp_coef *InterpCoefs;
 258    struct tgsi_exec_vector       QuadPos;
 259    float                         Face;    /**< +1 if front facing, -1 if back facing */
 260
 261    /* Conditional execution masks */
 262    uint CondMask;  /**< For IF/ELSE/ENDIF */
 263    uint LoopMask;  /**< For BGNLOOP/ENDLOOP */
 264    uint ContMask;  /**< For loop CONT statements */
 265    uint FuncMask;  /**< For function calls */
 266    uint ExecMask;  /**< = CondMask & LoopMask */
 267
 268    /* Current switch-case state. */
 269    struct tgsi_switch_record Switch;
 270
 271    /* Current break type. */
 272    enum tgsi_break_type BreakType;
 273
 274    /** Condition mask stack (for nested conditionals) */
 275    uint CondStack[TGSI_EXEC_MAX_COND_NESTING];
 276    int CondStackTop;
 277
 278    /** Loop mask stack (for nested loops) */
 279    uint LoopStack[TGSI_EXEC_MAX_LOOP_NESTING];
 280    int LoopStackTop;
 281
 282    /** Loop label stack */
 283    uint LoopLabelStack[TGSI_EXEC_MAX_LOOP_NESTING];
 284    int LoopLabelStackTop;
 285
 286    /** Loop continue mask stack (see comments in tgsi_exec.c) */
 287    uint ContStack[TGSI_EXEC_MAX_LOOP_NESTING];
 288    int ContStackTop;
 289
 290    /** Switch case stack */
 291    struct tgsi_switch_record SwitchStack[TGSI_EXEC_MAX_SWITCH_NESTING];
 292    int SwitchStackTop;
 293
 294    enum tgsi_break_type BreakStack[TGSI_EXEC_MAX_BREAK_STACK];
 295    int BreakStackTop;
 296
 297    /** Function execution mask stack (for executing subroutine code) */
 298    uint FuncStack[TGSI_EXEC_MAX_CALL_NESTING];
 299    int FuncStackTop;
 300
 301    /** Function call stack for saving/restoring the program counter */
 302    struct tgsi_call_record CallStack[TGSI_EXEC_MAX_CALL_NESTING];
 303    int CallStackTop;
 304
 305    struct tgsi_full_instruction *Instructions;
 306    uint NumInstructions;
 307
 308    struct tgsi_full_declaration *Declarations;
 309    uint NumDeclarations;
 310
 311    struct tgsi_declaration_resource Resources[PIPE_MAX_SHADER_RESOURCES];
 312
 313    boolean UsedGeometryShader;
 314 };
 315
 316 struct tgsi_exec_machine *
 317 tgsi_exec_machine_create( void );
 318
 319 void
 320 tgsi_exec_machine_destroy(struct tgsi_exec_machine *mach);
 321
 322
 323 void
 324 tgsi_exec_machine_bind_shader(
 325    struct tgsi_exec_machine *mach,
 326    const struct tgsi_token *tokens,
 327    uint numSamplers,
 328    struct tgsi_sampler **samplers);
 329
 330 uint
 331 tgsi_exec_machine_run(
 332    struct tgsi_exec_machine *mach );
 333
 334
 335 void
 336 tgsi_exec_machine_free_data(struct tgsi_exec_machine *mach);
 337
 338
 339 boolean
 340 tgsi_check_soa_dependencies(const struct tgsi_full_instruction *inst);
 341
 342
 343 static INLINE void
 344 tgsi_set_kill_mask(struct tgsi_exec_machine *mach, unsigned mask)
 345 {
 346    mach->Temps[TGSI_EXEC_TEMP_KILMASK_I].xyzw[TGSI_EXEC_TEMP_KILMASK_C].u[0] =
 347       mask;
 348 }
 349
 350
 351 /** Set execution mask values prior to executing the shader */
 352 static INLINE void
 353 tgsi_set_exec_mask(struct tgsi_exec_machine *mach,
 354                    boolean ch0, boolean ch1, boolean ch2, boolean ch3)
 355 {
 356    int *mask = mach->Temps[TGSI_EXEC_MASK_I].xyzw[TGSI_EXEC_MASK_C].i;
 357    mask[0] = ch0 ? ~0 : 0;
 358    mask[1] = ch1 ? ~0 : 0;
 359    mask[2] = ch2 ? ~0 : 0;
 360    mask[3] = ch3 ? ~0 : 0;
 361 }
 362
 363
 364 extern void
 365 tgsi_exec_set_constant_buffers(struct tgsi_exec_machine *mach,
 366                                unsigned num_bufs,
 367                                const void **bufs,
 368                                const unsigned *buf_sizes);
 369
 370
 371 static INLINE int
 372 tgsi_exec_get_shader_param(enum pipe_shader_cap param)
 373 {
 374    switch(param) {
 375    case PIPE_SHADER_CAP_MAX_INSTRUCTIONS:
 376    case PIPE_SHADER_CAP_MAX_ALU_INSTRUCTIONS:
 377    case PIPE_SHADER_CAP_MAX_TEX_INSTRUCTIONS:
 378    case PIPE_SHADER_CAP_MAX_TEX_INDIRECTIONS:
 379       return INT_MAX;
 380    case PIPE_SHADER_CAP_MAX_CONTROL_FLOW_DEPTH:
 381       return TGSI_EXEC_MAX_NESTING;
 382    case PIPE_SHADER_CAP_MAX_INPUTS:
 383       return TGSI_EXEC_MAX_INPUT_ATTRIBS;
 384    case PIPE_SHADER_CAP_MAX_CONSTS:
 385       return TGSI_EXEC_MAX_CONST_BUFFER;
 386    case PIPE_SHADER_CAP_MAX_CONST_BUFFERS:
 387       return PIPE_MAX_CONSTANT_BUFFERS;
 388    case PIPE_SHADER_CAP_MAX_TEMPS:
 389       return TGSI_EXEC_NUM_TEMPS;
 390    case PIPE_SHADER_CAP_MAX_ADDRS:
 391       return TGSI_EXEC_NUM_ADDRS;
 392    case PIPE_SHADER_CAP_MAX_PREDS:
 393       return TGSI_EXEC_NUM_PREDS;
 394    case PIPE_SHADER_CAP_TGSI_CONT_SUPPORTED:
 395       return 1;
 396    case PIPE_SHADER_CAP_INDIRECT_INPUT_ADDR:
 397    case PIPE_SHADER_CAP_INDIRECT_OUTPUT_ADDR:
 398    case PIPE_SHADER_CAP_INDIRECT_TEMP_ADDR:
 399    case PIPE_SHADER_CAP_INDIRECT_CONST_ADDR:
 400       return 1;
 401    case PIPE_SHADER_CAP_SUBROUTINES:
 402       return 1;
 403    default:
 404       return 0;
 405    }
 406 }
 407
 408 #if defined __cplusplus
 409 } /* extern "C" */
 410 #endif
 411
 412 #endif /* TGSI_EXEC_H */