src/mesa/state_tracker/st_mesa_to_tgsi.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2007-2008 Tungsten Graphics, Inc., Cedar Park, Texas.
   4  * All Rights Reserved.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the
   8  * "Software"), to deal in the Software without restriction, including
   9  * without limitation the rights to use, copy, modify, merge, publish,
  10  * distribute, sub license, and/or sell copies of the Software, and to
  11  * permit persons to whom the Software is furnished to do so, subject to
  12  * the following conditions:
  13  *
  14  * The above copyright notice and this permission notice (including the
  15  * next paragraph) shall be included in all copies or substantial portions
  16  * of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  19  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  20  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  21  * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
  22  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  23  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  24  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  *
  26  **************************************************************************/
  27
  28 /*
  29  * \author
  30  * Michal Krol,
  31  * Keith Whitwell
  32  */
  33
  34 #include "pipe/p_compiler.h"
  35 #include "pipe/p_shader_tokens.h"
  36 #include "pipe/p_state.h"
  37 #include "tgsi/tgsi_ureg.h"
  38 #include "st_mesa_to_tgsi.h"
  39 #include "shader/prog_instruction.h"
  40 #include "shader/prog_parameter.h"
  41 #include "shader/prog_print.h"
  42 #include "util/u_debug.h"
  43 #include "util/u_math.h"
  44 #include "util/u_memory.h"
  45
  46 struct label {
  47    unsigned branch_target;
  48    unsigned token;
  49 };
  50
  51 struct st_translate {
  52    struct ureg_program *ureg;
  53
  54    struct ureg_dst temps[MAX_PROGRAM_TEMPS];
  55    struct ureg_src *constants;
  56    struct ureg_dst outputs[PIPE_MAX_SHADER_OUTPUTS];
  57    struct ureg_src inputs[PIPE_MAX_SHADER_INPUTS];
  58    struct ureg_dst address[1];
  59    struct ureg_src samplers[PIPE_MAX_SAMPLERS];
  60
  61    const GLuint *inputMapping;
  62    const GLuint *outputMapping;
  63
  64    /* For every instruction that contains a label (eg CALL), keep
  65     * details so that we can go back afterwards and emit the correct
  66     * tgsi instruction number for each label.
  67     */
  68    struct label *labels;
  69    unsigned labels_size;
  70    unsigned labels_count;
  71
  72    /* Keep a record of the tgsi instruction number that each mesa
  73     * instruction starts at, will be used to fix up labels after
  74     * translation.
  75     */
  76    unsigned *insn;
  77    unsigned insn_size;
  78    unsigned insn_count;
  79
  80    unsigned procType;  /**< TGSI_PROCESSOR_VERTEX/FRAGMENT */
  81
  82    boolean error;
  83 };
  84
  85
  86 static unsigned *get_label( struct st_translate *t,
  87                             unsigned branch_target )
  88 {
  89    unsigned i;
  90
  91    if (t->labels_count + 1 >= t->labels_size) {
  92       unsigned old_size = t->labels_size;
  93       t->labels_size = 1 << (util_logbase2(t->labels_size) + 1);
  94       t->labels = REALLOC( t->labels,
  95                            old_size * sizeof t->labels[0],
  96                            t->labels_size * sizeof t->labels[0] );
  97       if (t->labels == NULL) {
  98          static unsigned dummy;
  99          t->error = TRUE;
 100          return &dummy;
 101       }
 102    }
 103
 104    i = t->labels_count++;
 105    t->labels[i].branch_target = branch_target;
 106    return &t->labels[i].token;
 107 }
 108
 109
 110 static void set_insn_start( struct st_translate *t,
 111                             unsigned start )
 112 {
 113    if (t->insn_count + 1 >= t->insn_size) {
 114       unsigned old_size = t->insn_size;
 115       t->insn_size = 1 << (util_logbase2(t->insn_size) + 1);
 116       t->insn = REALLOC( t->insn,
 117                          old_size * sizeof t->insn[0],
 118                          t->insn_size * sizeof t->insn[0] );
 119       if (t->insn == NULL) {
 120          t->error = TRUE;
 121          return;
 122       }
 123    }
 124
 125    t->insn[t->insn_count++] = start;
 126 }
 127
 128
 129 /*
 130  * Map mesa register file to TGSI register file.
 131  */
 132 static struct ureg_dst
 133 dst_register( struct st_translate *t,
 134               gl_register_file file,
 135               GLuint index )
 136 {
 137    switch( file ) {
 138    case PROGRAM_UNDEFINED:
 139       return ureg_dst_undef();
 140
 141    case PROGRAM_TEMPORARY:
 142       if (ureg_dst_is_undef(t->temps[index]))
 143          t->temps[index] = ureg_DECL_temporary( t->ureg );
 144
 145       return t->temps[index];
 146
 147    case PROGRAM_OUTPUT:
 148       return t->outputs[t->outputMapping[index]];
 149
 150    case PROGRAM_ADDRESS:
 151       return t->address[index];
 152
 153    default:
 154       assert( 0 );
 155       return ureg_dst_undef();
 156    }
 157 }
 158
 159
 160 static struct ureg_src
 161 src_register( struct st_translate *t,
 162               gl_register_file file,
 163               GLuint index )
 164 {
 165    switch( file ) {
 166    case PROGRAM_UNDEFINED:
 167       return ureg_src_undef();
 168
 169    case PROGRAM_TEMPORARY:
 170       if (ureg_dst_is_undef(t->temps[index]))
 171          t->temps[index] = ureg_DECL_temporary( t->ureg );
 172       return ureg_src(t->temps[index]);
 173
 174    case PROGRAM_STATE_VAR:
 175    case PROGRAM_NAMED_PARAM:
 176    case PROGRAM_UNIFORM:
 177    case PROGRAM_CONSTANT:
 178       return t->constants[index];
 179
 180    case PROGRAM_INPUT:
 181       return t->inputs[t->inputMapping[index]];
 182
 183    case PROGRAM_OUTPUT:
 184       return ureg_src(t->outputs[t->outputMapping[index]]); /* not needed? */
 185
 186    case PROGRAM_ADDRESS:
 187       return ureg_src(t->address[index]);
 188
 189    default:
 190       assert( 0 );
 191       return ureg_src_undef();
 192    }
 193 }
 194
 195
 196 /**
 197  * Map mesa texture target to TGSI texture target.
 198  */
 199 static unsigned
 200 translate_texture_target( GLuint textarget,
 201                           GLboolean shadow )
 202 {
 203    if (shadow) {
 204       switch( textarget ) {
 205       case TEXTURE_1D_INDEX:   return TGSI_TEXTURE_SHADOW1D;
 206       case TEXTURE_2D_INDEX:   return TGSI_TEXTURE_SHADOW2D;
 207       case TEXTURE_RECT_INDEX: return TGSI_TEXTURE_SHADOWRECT;
 208       default: break;
 209       }
 210    }
 211
 212    switch( textarget ) {
 213    case TEXTURE_1D_INDEX:   return TGSI_TEXTURE_1D;
 214    case TEXTURE_2D_INDEX:   return TGSI_TEXTURE_2D;
 215    case TEXTURE_3D_INDEX:   return TGSI_TEXTURE_3D;
 216    case TEXTURE_CUBE_INDEX: return TGSI_TEXTURE_CUBE;
 217    case TEXTURE_RECT_INDEX: return TGSI_TEXTURE_RECT;
 218    default:
 219       assert( 0 );
 220       return TGSI_TEXTURE_1D;
 221    }
 222 }
 223
 224
 225 static struct ureg_dst
 226 translate_dst( struct st_translate *t,
 227                const struct prog_dst_register *DstReg,
 228                boolean saturate )
 229 {
 230    struct ureg_dst dst = dst_register( t,
 231                                        DstReg->File,
 232                                        DstReg->Index );
 233
 234    dst = ureg_writemask( dst,
 235                          DstReg->WriteMask );
 236
 237    if (saturate)
 238       dst = ureg_saturate( dst );
 239
 240    if (DstReg->RelAddr)
 241       dst = ureg_dst_indirect( dst, ureg_src(t->address[0]) );
 242
 243    return dst;
 244 }
 245
 246
 247 static struct ureg_src
 248 translate_src( struct st_translate *t,
 249                const struct prog_src_register *SrcReg )
 250 {
 251    struct ureg_src src = src_register( t, SrcReg->File, SrcReg->Index );
 252
 253    src = ureg_swizzle( src,
 254                        GET_SWZ( SrcReg->Swizzle, 0 ) & 0x3,
 255                        GET_SWZ( SrcReg->Swizzle, 1 ) & 0x3,
 256                        GET_SWZ( SrcReg->Swizzle, 2 ) & 0x3,
 257                        GET_SWZ( SrcReg->Swizzle, 3 ) & 0x3);
 258
 259    if (SrcReg->Negate == NEGATE_XYZW)
 260       src = ureg_negate(src);
 261
 262    if (SrcReg->Abs)
 263       src = ureg_abs(src);
 264
 265    if (SrcReg->RelAddr)
 266       src = ureg_src_indirect( src, ureg_src(t->address[0]));
 267
 268    return src;
 269 }
 270
 271
 272 static struct ureg_src swizzle_4v( struct ureg_src src,
 273                                    const unsigned *swz )
 274 {
 275    return ureg_swizzle( src, swz[0], swz[1], swz[2], swz[3] );
 276 }
 277
 278
 279 /**
 280  * Translate SWZ instructions into a single MAD.  EG:
 281  *
 282  *   SWZ dst, src.x-y10
 283  *
 284  * becomes:
 285  *
 286  *   MAD dst {1,-1,0,0}, src.xyxx, {0,0,1,0}
 287  */
 288 static void emit_swz( struct st_translate *t,
 289                       struct ureg_dst dst,
 290                       const struct prog_src_register *SrcReg )
 291 {
 292    struct ureg_program *ureg = t->ureg;
 293    struct ureg_src src = src_register( t, SrcReg->File, SrcReg->Index );
 294
 295    unsigned negate_mask =  SrcReg->Negate;
 296
 297    unsigned one_mask = ((GET_SWZ(SrcReg->Swizzle, 0) == SWIZZLE_ONE) << 0 |
 298                         (GET_SWZ(SrcReg->Swizzle, 1) == SWIZZLE_ONE) << 1 |
 299                         (GET_SWZ(SrcReg->Swizzle, 2) == SWIZZLE_ONE) << 2 |
 300                         (GET_SWZ(SrcReg->Swizzle, 3) == SWIZZLE_ONE) << 3);
 301
 302    unsigned zero_mask = ((GET_SWZ(SrcReg->Swizzle, 0) == SWIZZLE_ZERO) << 0 |
 303                          (GET_SWZ(SrcReg->Swizzle, 1) == SWIZZLE_ZERO) << 1 |
 304                          (GET_SWZ(SrcReg->Swizzle, 2) == SWIZZLE_ZERO) << 2 |
 305                          (GET_SWZ(SrcReg->Swizzle, 3) == SWIZZLE_ZERO) << 3);
 306
 307    unsigned negative_one_mask = one_mask & negate_mask;
 308    unsigned positive_one_mask = one_mask & ~negate_mask;
 309
 310    struct ureg_src imm;
 311    unsigned i;
 312    unsigned mul_swizzle[4] = {0,0,0,0};
 313    unsigned add_swizzle[4] = {0,0,0,0};
 314    unsigned src_swizzle[4] = {0,0,0,0};
 315    boolean need_add = FALSE;
 316    boolean need_mul = FALSE;
 317
 318    if (dst.WriteMask == 0)
 319       return;
 320
 321    /* Is this just a MOV?
 322     */
 323    if (zero_mask == 0 &&
 324        one_mask == 0 &&
 325        (negate_mask == 0 || negate_mask == TGSI_WRITEMASK_XYZW))
 326    {
 327       ureg_MOV( ureg, dst, translate_src( t, SrcReg ));
 328       return;
 329    }
 330
 331 #define IMM_ZERO    0
 332 #define IMM_ONE     1
 333 #define IMM_NEG_ONE 2
 334
 335    imm = ureg_imm3f( ureg, 0, 1, -1 );
 336
 337    for (i = 0; i < 4; i++) {
 338       unsigned bit = 1 << i;
 339
 340       if (dst.WriteMask & bit) {
 341          if (positive_one_mask & bit) {
 342             mul_swizzle[i] = IMM_ZERO;
 343             add_swizzle[i] = IMM_ONE;
 344             need_add = TRUE;
 345          }
 346          else if (negative_one_mask & bit) {
 347             mul_swizzle[i] = IMM_ZERO;
 348             add_swizzle[i] = IMM_NEG_ONE;
 349             need_add = TRUE;
 350          }
 351          else if (zero_mask & bit) {
 352             mul_swizzle[i] = IMM_ZERO;
 353             add_swizzle[i] = IMM_ZERO;
 354             need_add = TRUE;
 355          }
 356          else {
 357             add_swizzle[i] = IMM_ZERO;
 358             src_swizzle[i] = GET_SWZ(SrcReg->Swizzle, i);
 359             need_mul = TRUE;
 360             if (negate_mask & bit) {
 361                mul_swizzle[i] = IMM_NEG_ONE;
 362             }
 363             else {
 364                mul_swizzle[i] = IMM_ONE;
 365             }
 366          }
 367       }
 368    }
 369
 370    if (need_mul && need_add) {
 371       ureg_MAD( ureg,
 372                 dst,
 373                 swizzle_4v( src, src_swizzle ),
 374                 swizzle_4v( imm, mul_swizzle ),
 375                 swizzle_4v( imm, add_swizzle ) );
 376    }
 377    else if (need_mul) {
 378       ureg_MUL( ureg,
 379                 dst,
 380                 swizzle_4v( src, src_swizzle ),
 381                 swizzle_4v( imm, mul_swizzle ) );
 382    }
 383    else if (need_add) {
 384       ureg_MOV( ureg,
 385                 dst,
 386                 swizzle_4v( imm, add_swizzle ) );
 387    }
 388    else {
 389       assert(0);
 390    }
 391
 392 #undef IMM_ZERO
 393 #undef IMM_ONE
 394 #undef IMM_NEG_ONE
 395 }
 396
 397
 398
 399 static unsigned
 400 translate_opcode( unsigned op )
 401 {
 402    switch( op ) {
 403    case OPCODE_ARL:
 404       return TGSI_OPCODE_ARL;
 405    case OPCODE_ABS:
 406       return TGSI_OPCODE_ABS;
 407    case OPCODE_ADD:
 408       return TGSI_OPCODE_ADD;
 409    case OPCODE_BGNLOOP:
 410       return TGSI_OPCODE_BGNLOOP;
 411    case OPCODE_BGNSUB:
 412       return TGSI_OPCODE_BGNSUB;
 413    case OPCODE_BRA:
 414       return TGSI_OPCODE_BRA;
 415    case OPCODE_BRK:
 416       return TGSI_OPCODE_BRK;
 417    case OPCODE_CAL:
 418       return TGSI_OPCODE_CAL;
 419    case OPCODE_CMP:
 420       return TGSI_OPCODE_CMP;
 421    case OPCODE_CONT:
 422       return TGSI_OPCODE_CONT;
 423    case OPCODE_COS:
 424       return TGSI_OPCODE_COS;
 425    case OPCODE_DDX:
 426       return TGSI_OPCODE_DDX;
 427    case OPCODE_DDY:
 428       return TGSI_OPCODE_DDY;
 429    case OPCODE_DP2:
 430       return TGSI_OPCODE_DP2;
 431    case OPCODE_DP2A:
 432       return TGSI_OPCODE_DP2A;
 433    case OPCODE_DP3:
 434       return TGSI_OPCODE_DP3;
 435    case OPCODE_DP4:
 436       return TGSI_OPCODE_DP4;
 437    case OPCODE_DPH:
 438       return TGSI_OPCODE_DPH;
 439    case OPCODE_DST:
 440       return TGSI_OPCODE_DST;
 441    case OPCODE_ELSE:
 442       return TGSI_OPCODE_ELSE;
 443    case OPCODE_ENDIF:
 444       return TGSI_OPCODE_ENDIF;
 445    case OPCODE_ENDLOOP:
 446       return TGSI_OPCODE_ENDLOOP;
 447    case OPCODE_ENDSUB:
 448       return TGSI_OPCODE_ENDSUB;
 449    case OPCODE_EX2:
 450       return TGSI_OPCODE_EX2;
 451    case OPCODE_EXP:
 452       return TGSI_OPCODE_EXP;
 453    case OPCODE_FLR:
 454       return TGSI_OPCODE_FLR;
 455    case OPCODE_FRC:
 456       return TGSI_OPCODE_FRC;
 457    case OPCODE_IF:
 458       return TGSI_OPCODE_IF;
 459    case OPCODE_TRUNC:
 460       return TGSI_OPCODE_TRUNC;
 461    case OPCODE_KIL:
 462       return TGSI_OPCODE_KIL;
 463    case OPCODE_KIL_NV:
 464       return TGSI_OPCODE_KILP;
 465    case OPCODE_LG2:
 466       return TGSI_OPCODE_LG2;
 467    case OPCODE_LOG:
 468       return TGSI_OPCODE_LOG;
 469    case OPCODE_LIT:
 470       return TGSI_OPCODE_LIT;
 471    case OPCODE_LRP:
 472       return TGSI_OPCODE_LRP;
 473    case OPCODE_MAD:
 474       return TGSI_OPCODE_MAD;
 475    case OPCODE_MAX:
 476       return TGSI_OPCODE_MAX;
 477    case OPCODE_MIN:
 478       return TGSI_OPCODE_MIN;
 479    case OPCODE_MOV:
 480       return TGSI_OPCODE_MOV;
 481    case OPCODE_MUL:
 482       return TGSI_OPCODE_MUL;
 483    case OPCODE_NOISE1:
 484       return TGSI_OPCODE_NOISE1;
 485    case OPCODE_NOISE2:
 486       return TGSI_OPCODE_NOISE2;
 487    case OPCODE_NOISE3:
 488       return TGSI_OPCODE_NOISE3;
 489    case OPCODE_NOISE4:
 490       return TGSI_OPCODE_NOISE4;
 491    case OPCODE_NOP:
 492       return TGSI_OPCODE_NOP;
 493    case OPCODE_NRM3:
 494       return TGSI_OPCODE_NRM;
 495    case OPCODE_NRM4:
 496       return TGSI_OPCODE_NRM4;
 497    case OPCODE_POW:
 498       return TGSI_OPCODE_POW;
 499    case OPCODE_RCP:
 500       return TGSI_OPCODE_RCP;
 501    case OPCODE_RET:
 502       return TGSI_OPCODE_RET;
 503    case OPCODE_RSQ:
 504       return TGSI_OPCODE_RSQ;
 505    case OPCODE_SCS:
 506       return TGSI_OPCODE_SCS;
 507    case OPCODE_SEQ:
 508       return TGSI_OPCODE_SEQ;
 509    case OPCODE_SGE:
 510       return TGSI_OPCODE_SGE;
 511    case OPCODE_SGT:
 512       return TGSI_OPCODE_SGT;
 513    case OPCODE_SIN:
 514       return TGSI_OPCODE_SIN;
 515    case OPCODE_SLE:
 516       return TGSI_OPCODE_SLE;
 517    case OPCODE_SLT:
 518       return TGSI_OPCODE_SLT;
 519    case OPCODE_SNE:
 520       return TGSI_OPCODE_SNE;
 521    case OPCODE_SSG:
 522       return TGSI_OPCODE_SSG;
 523    case OPCODE_SUB:
 524       return TGSI_OPCODE_SUB;
 525    case OPCODE_SWZ:
 526       return TGSI_OPCODE_SWZ;
 527    case OPCODE_TEX:
 528       return TGSI_OPCODE_TEX;
 529    case OPCODE_TXB:
 530       return TGSI_OPCODE_TXB;
 531    case OPCODE_TXD:
 532       return TGSI_OPCODE_TXD;
 533    case OPCODE_TXL:
 534       return TGSI_OPCODE_TXL;
 535    case OPCODE_TXP:
 536       return TGSI_OPCODE_TXP;
 537    case OPCODE_XPD:
 538       return TGSI_OPCODE_XPD;
 539    case OPCODE_END:
 540       return TGSI_OPCODE_END;
 541    default:
 542       assert( 0 );
 543       return TGSI_OPCODE_NOP;
 544    }
 545 }
 546
 547
 548 static void
 549 compile_instruction(
 550    struct st_translate *t,
 551    const struct prog_instruction *inst )
 552 {
 553    struct ureg_program *ureg = t->ureg;
 554    GLuint i;
 555    struct ureg_dst dst[1];
 556    struct ureg_src src[4];
 557    unsigned num_dst;
 558    unsigned num_src;
 559
 560    num_dst = _mesa_num_inst_dst_regs( inst->Opcode );
 561    num_src = _mesa_num_inst_src_regs( inst->Opcode );
 562
 563    if (num_dst)
 564       dst[0] = translate_dst( t,
 565                               &inst->DstReg,
 566                               inst->SaturateMode );
 567
 568    for (i = 0; i < num_src; i++)
 569       src[i] = translate_src( t, &inst->SrcReg[i] );
 570
 571    switch( inst->Opcode ) {
 572    case OPCODE_SWZ:
 573       emit_swz( t, dst[0], &inst->SrcReg[0] );
 574       return;
 575
 576    case OPCODE_BGNLOOP:
 577    case OPCODE_CAL:
 578    case OPCODE_ELSE:
 579    case OPCODE_ENDLOOP:
 580    case OPCODE_IF:
 581       assert(num_dst == 0);
 582       ureg_label_insn( ureg,
 583                        translate_opcode( inst->Opcode ),
 584                        src, num_src,
 585                        get_label( t, inst->BranchTarget ));
 586       return;
 587
 588    case OPCODE_TEX:
 589    case OPCODE_TXB:
 590    case OPCODE_TXD:
 591    case OPCODE_TXL:
 592    case OPCODE_TXP:
 593       src[num_src++] = t->samplers[inst->TexSrcUnit];
 594       ureg_tex_insn( ureg,
 595                      translate_opcode( inst->Opcode ),
 596                      dst, num_dst,
 597                      translate_texture_target( inst->TexSrcTarget,
 598                                                inst->TexShadow ),
 599                      src, num_src );
 600       return;
 601
 602    case OPCODE_SCS:
 603       dst[0] = ureg_writemask(dst[0], TGSI_WRITEMASK_XY );
 604       ureg_insn( ureg,
 605                  translate_opcode( inst->Opcode ),
 606                  dst, num_dst,
 607                  src, num_src );
 608       break;
 609
 610    case OPCODE_XPD:
 611       dst[0] = ureg_writemask(dst[0], TGSI_WRITEMASK_XYZ );
 612       ureg_insn( ureg,
 613                  translate_opcode( inst->Opcode ),
 614                  dst, num_dst,
 615                  src, num_src );
 616       break;
 617
 618    default:
 619       ureg_insn( ureg,
 620                  translate_opcode( inst->Opcode ),
 621                  dst, num_dst,
 622                  src, num_src );
 623       break;
 624    }
 625 }
 626
 627
 628 /**
 629  * Emit the TGSI instructions for inverting the WPOS y coordinate.
 630  */
 631 static void
 632 emit_inverted_wpos( struct st_translate *t,
 633                     const struct gl_program *program )
 634 {
 635    struct ureg_program *ureg = t->ureg;
 636
 637    /* Fragment program uses fragment position input.
 638     * Need to replace instances of INPUT[WPOS] with temp T
 639     * where T = INPUT[WPOS] by y is inverted.
 640     */
 641    static const gl_state_index winSizeState[STATE_LENGTH]
 642       = { STATE_INTERNAL, STATE_FB_SIZE, 0, 0, 0 };
 643
 644    /* XXX: note we are modifying the incoming shader here!  Need to
 645     * do this before emitting the constant decls below, or this
 646     * will be missed:
 647     */
 648    unsigned winHeightConst = _mesa_add_state_reference(program->Parameters,
 649                                                        winSizeState);
 650
 651    struct ureg_src winsize = ureg_DECL_constant( ureg, winHeightConst );
 652    struct ureg_dst wpos_temp = ureg_DECL_temporary( ureg );
 653    struct ureg_src wpos_input = t->inputs[t->inputMapping[FRAG_ATTRIB_WPOS]];
 654
 655    /* MOV wpos_temp, input[wpos]
 656     */
 657    ureg_MOV( ureg, wpos_temp, wpos_input );
 658
 659    /* SUB wpos_temp.y, winsize_const, wpos_input
 660     */
 661    ureg_SUB( ureg,
 662              ureg_writemask(wpos_temp, TGSI_WRITEMASK_Y ),
 663              winsize,
 664              wpos_input);
 665
 666    /* Use wpos_temp as position input from here on:
 667     */
 668    t->inputs[t->inputMapping[FRAG_ATTRIB_WPOS]] = ureg_src(wpos_temp);
 669 }
 670
 671
 672 /**
 673  * Translate Mesa program to TGSI format.
 674  * \param program  the program to translate
 675  * \param numInputs  number of input registers used
 676  * \param inputMapping  maps Mesa fragment program inputs to TGSI generic
 677  *                      input indexes
 678  * \param inputSemanticName  the TGSI_SEMANTIC flag for each input
 679  * \param inputSemanticIndex  the semantic index (ex: which texcoord) for
 680  *                            each input
 681  * \param interpMode  the TGSI_INTERPOLATE_LINEAR/PERSP mode for each input
 682  * \param numOutputs  number of output registers used
 683  * \param outputMapping  maps Mesa fragment program outputs to TGSI
 684  *                       generic outputs
 685  * \param outputSemanticName  the TGSI_SEMANTIC flag for each output
 686  * \param outputSemanticIndex  the semantic index (ex: which texcoord) for
 687  *                             each output
 688  *
 689  * \return  array of translated tokens, caller's responsibility to free
 690  */
 691 const struct tgsi_token *
 692 st_translate_mesa_program(
 693    GLcontext *ctx,
 694    uint procType,
 695    const struct gl_program *program,
 696    GLuint numInputs,
 697    const GLuint inputMapping[],
 698    const ubyte inputSemanticName[],
 699    const ubyte inputSemanticIndex[],
 700    const GLuint interpMode[],
 701    const GLbitfield inputFlags[],
 702    GLuint numOutputs,
 703    const GLuint outputMapping[],
 704    const ubyte outputSemanticName[],
 705    const ubyte outputSemanticIndex[],
 706    const GLbitfield outputFlags[] )
 707 {
 708    struct st_translate translate, *t;
 709    struct ureg_program *ureg;
 710    const struct tgsi_token *tokens = NULL;
 711    unsigned i;
 712
 713    t = &translate;
 714    memset(t, 0, sizeof *t);
 715
 716    t->procType = procType;
 717    t->inputMapping = inputMapping;
 718    t->outputMapping = outputMapping;
 719    t->ureg = ureg_create( procType );
 720    if (t->ureg == NULL)
 721       return NULL;
 722
 723    ureg = t->ureg;
 724
 725    /*_mesa_print_program(program);*/
 726
 727    /*
 728     * Declare input attributes.
 729     */
 730    if (procType == TGSI_PROCESSOR_FRAGMENT) {
 731       for (i = 0; i < numInputs; i++) {
 732          t->inputs[i] = ureg_DECL_fs_input(ureg,
 733                                            inputSemanticName[i],
 734                                            inputSemanticIndex[i],
 735                                            interpMode[i]);
 736       }
 737
 738       if (program->InputsRead & FRAG_BIT_WPOS) {
 739          /* Must do this after setting up t->inputs, and before
 740           * emitting constant references, below:
 741           */
 742          emit_inverted_wpos( t, program );
 743       }
 744
 745       /*
 746        * Declare output attributes.
 747        */
 748       for (i = 0; i < numOutputs; i++) {
 749          switch (outputSemanticName[i]) {
 750          case TGSI_SEMANTIC_POSITION:
 751             t->outputs[i] = ureg_DECL_output( ureg,
 752                                               TGSI_SEMANTIC_POSITION, /* Z / Depth */
 753                                               outputSemanticIndex[i] );
 754
 755             t->outputs[i] = ureg_writemask( t->outputs[i],
 756                                             TGSI_WRITEMASK_Z );
 757             break;
 758          case TGSI_SEMANTIC_COLOR:
 759             t->outputs[i] = ureg_DECL_output( ureg,
 760                                               TGSI_SEMANTIC_COLOR,
 761                                               outputSemanticIndex[i] );
 762             break;
 763          default:
 764             assert(0);
 765             return 0;
 766          }
 767       }
 768    }
 769    else {
 770       for (i = 0; i < numInputs; i++) {
 771          t->inputs[i] = ureg_DECL_vs_input(ureg, i);
 772       }
 773
 774       for (i = 0; i < numOutputs; i++) {
 775          t->outputs[i] = ureg_DECL_output( ureg,
 776                                            outputSemanticName[i],
 777                                            outputSemanticIndex[i] );
 778       }
 779    }
 780
 781    /* Declare address register.
 782     */
 783    if (program->NumAddressRegs > 0) {
 784       assert( program->NumAddressRegs == 1 );
 785       t->address[0] = ureg_DECL_address( ureg );
 786    }
 787
 788
 789    /* Emit constants and immediates.  Mesa uses a single index space
 790     * for these, so we put all the translated regs in t->constants.
 791     */
 792    if (program->Parameters) {
 793
 794       t->constants = CALLOC( program->Parameters->NumParameters,
 795                              sizeof t->constants[0] );
 796       if (t->constants == NULL)
 797          goto out;
 798
 799       for (i = 0; i < program->Parameters->NumParameters; i++) {
 800          switch (program->Parameters->Parameters[i].Type) {
 801          case PROGRAM_ENV_PARAM:
 802          case PROGRAM_STATE_VAR:
 803          case PROGRAM_NAMED_PARAM:
 804          case PROGRAM_UNIFORM:
 805             t->constants[i] = ureg_DECL_constant( ureg, i );
 806             break;
 807
 808             /* Emit immediates only when there is no address register
 809              * in use.  FIXME: Be smarter and recognize param arrays:
 810              * indirect addressing is only valid within the referenced
 811              * array.
 812              */
 813          case PROGRAM_CONSTANT:
 814             if (program->NumAddressRegs > 0)
 815                t->constants[i] = ureg_DECL_constant( ureg, i );
 816             else
 817                t->constants[i] =
 818                   ureg_DECL_immediate( ureg,
 819                                        program->Parameters->ParameterValues[i],
 820                                        4 );
 821             break;
 822          default:
 823             break;
 824          }
 825       }
 826    }
 827
 828    /* texture samplers */
 829    for (i = 0; i < ctx->Const.MaxTextureImageUnits; i++) {
 830       if (program->SamplersUsed & (1 << i)) {
 831          t->samplers[i] = ureg_DECL_sampler( ureg, i );
 832       }
 833    }
 834
 835    /* Emit each instruction in turn:
 836     */
 837    for (i = 0; i < program->NumInstructions; i++) {
 838       set_insn_start( t, ureg_get_instruction_number( ureg ));
 839       compile_instruction( t, &program->Instructions[i] );
 840    }
 841
 842    /* Fix up all emitted labels:
 843     */
 844    for (i = 0; i < t->labels_count; i++) {
 845       ureg_fixup_label( ureg,
 846                         t->labels[i].token,
 847                         t->insn[t->labels[i].branch_target] );
 848    }
 849
 850    tokens = ureg_get_tokens( ureg, NULL );
 851    ureg_destroy( ureg );
 852
 853 out:
 854    FREE(t->insn);
 855    FREE(t->labels);
 856    FREE(t->constants);
 857
 858    if (t->error) {
 859       debug_printf("%s: translate error flag set\n", __FUNCTION__);
 860       FREE((void *)tokens);
 861       tokens = NULL;
 862    }
 863
 864    if (!tokens) {
 865       debug_printf("%s: failed to translate Mesa program:\n", __FUNCTION__);
 866       _mesa_print_program(program);
 867       assert(0);
 868    }
 869
 870    return tokens;
 871 }
 872
 873
 874 /**
 875  * Tokens cannot be free with _mesa_free otherwise the builtin gallium
 876  * malloc debugging will get confused.
 877  */
 878 void
 879 st_free_tokens(const struct tgsi_token *tokens)
 880 {
 881    FREE((void *)tokens);
 882 }