src/mesa/drivers/dri/i965/brw_wm_fp.c

   1 /*
   2  Copyright (C) Intel Corp.  2006.  All Rights Reserved.
   3  Intel funded Tungsten Graphics (http://www.tungstengraphics.com) to
   4  develop this 3D driver.
   5
   6  Permission is hereby granted, free of charge, to any person obtaining
   7  a 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, sublicense, 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
  16  portions of the Software.
  17
  18  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  19  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  20  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
  21  IN NO EVENT SHALL THE COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS BE
  22  LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  23  OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  24  WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25
  26  **********************************************************************/
  27  /*
  28   * Authors:
  29   *   Keith Whitwell <keith@tungstengraphics.com>
  30   */
  31
  32
  33 #include "main/glheader.h"
  34 #include "main/macros.h"
  35 #include "main/enums.h"
  36 #include "brw_context.h"
  37 #include "brw_wm.h"
  38 #include "brw_util.h"
  39
  40 #include "program/prog_parameter.h"
  41 #include "program/prog_print.h"
  42 #include "program/prog_statevars.h"
  43
  44
  45 /** An invalid texture target */
  46 #define TEX_TARGET_NONE NUM_TEXTURE_TARGETS
  47
  48 /** An invalid texture unit */
  49 #define TEX_UNIT_NONE BRW_MAX_TEX_UNIT
  50
  51 #define FIRST_INTERNAL_TEMP MAX_NV_FRAGMENT_PROGRAM_TEMPS
  52
  53 #define X    0
  54 #define Y    1
  55 #define Z    2
  56 #define W    3
  57
  58
  59 static const char *wm_opcode_strings[] = {
  60    "PIXELXY",
  61    "DELTAXY",
  62    "PIXELW",
  63    "LINTERP",
  64    "PINTERP",
  65    "CINTERP",
  66    "WPOSXY",
  67    "FB_WRITE",
  68    "FRONTFACING",
  69 };
  70
  71 #if 0
  72 static const char *wm_file_strings[] = {
  73    "PAYLOAD"
  74 };
  75 #endif
  76
  77
  78 /***********************************************************************
  79  * Source regs
  80  */
  81
  82 static struct prog_src_register src_reg(GLuint file, GLuint idx)
  83 {
  84    struct prog_src_register reg;
  85    reg.File = file;
  86    reg.Index = idx;
  87    reg.Swizzle = SWIZZLE_NOOP;
  88    reg.RelAddr = 0;
  89    reg.Negate = NEGATE_NONE;
  90    reg.Abs = 0;
  91    reg.HasIndex2 = 0;
  92    reg.RelAddr2 = 0;
  93    reg.Index2 = 0;
  94    return reg;
  95 }
  96
  97 static struct prog_src_register src_reg_from_dst(struct prog_dst_register dst)
  98 {
  99    return src_reg(dst.File, dst.Index);
 100 }
 101
 102 static struct prog_src_register src_undef( void )
 103 {
 104    return src_reg(PROGRAM_UNDEFINED, 0);
 105 }
 106
 107 static bool src_is_undef(struct prog_src_register src)
 108 {
 109    return src.File == PROGRAM_UNDEFINED;
 110 }
 111
 112 static struct prog_src_register src_swizzle( struct prog_src_register reg, int x, int y, int z, int w )
 113 {
 114    reg.Swizzle = MAKE_SWIZZLE4(x,y,z,w);
 115    return reg;
 116 }
 117
 118 static struct prog_src_register src_swizzle1( struct prog_src_register reg, int x )
 119 {
 120    return src_swizzle(reg, x, x, x, x);
 121 }
 122
 123 static struct prog_src_register src_swizzle4( struct prog_src_register reg, uint swizzle )
 124 {
 125    reg.Swizzle = swizzle;
 126    return reg;
 127 }
 128
 129
 130 /***********************************************************************
 131  * Dest regs
 132  */
 133
 134 static struct prog_dst_register dst_reg(GLuint file, GLuint idx)
 135 {
 136    struct prog_dst_register reg;
 137    reg.File = file;
 138    reg.Index = idx;
 139    reg.WriteMask = WRITEMASK_XYZW;
 140    reg.RelAddr = 0;
 141    reg.CondMask = COND_TR;
 142    reg.CondSwizzle = 0;
 143    reg.CondSrc = 0;
 144    return reg;
 145 }
 146
 147 static struct prog_dst_register dst_mask( struct prog_dst_register reg, int mask )
 148 {
 149    reg.WriteMask &= mask;
 150    return reg;
 151 }
 152
 153 static struct prog_dst_register dst_undef( void )
 154 {
 155    return dst_reg(PROGRAM_UNDEFINED, 0);
 156 }
 157
 158
 159
 160 static struct prog_dst_register get_temp( struct brw_wm_compile *c )
 161 {
 162    int bit = _mesa_ffs( ~c->fp_temp );
 163
 164    if (!bit) {
 165       printf("%s: out of temporaries\n", __FILE__);
 166       exit(1);
 167    }
 168
 169    c->fp_temp |= 1<<(bit-1);
 170    return dst_reg(PROGRAM_TEMPORARY, FIRST_INTERNAL_TEMP+(bit-1));
 171 }
 172
 173
 174 static void release_temp( struct brw_wm_compile *c, struct prog_dst_register temp )
 175 {
 176    c->fp_temp &= ~(1 << (temp.Index - FIRST_INTERNAL_TEMP));
 177 }
 178
 179
 180 /***********************************************************************
 181  * Instructions
 182  */
 183
 184 static struct prog_instruction *get_fp_inst(struct brw_wm_compile *c)
 185 {
 186    assert(c->nr_fp_insns < BRW_WM_MAX_INSN);
 187    memset(&c->prog_instructions[c->nr_fp_insns], 0,
 188           sizeof(*c->prog_instructions));
 189    return &c->prog_instructions[c->nr_fp_insns++];
 190 }
 191
 192 static struct prog_instruction *emit_insn(struct brw_wm_compile *c,
 193                                         const struct prog_instruction *inst0)
 194 {
 195    struct prog_instruction *inst = get_fp_inst(c);
 196    *inst = *inst0;
 197    return inst;
 198 }
 199
 200 static struct prog_instruction * emit_tex_op(struct brw_wm_compile *c,
 201                                        GLuint op,
 202                                        struct prog_dst_register dest,
 203                                        GLuint saturate,
 204                                        GLuint tex_src_unit,
 205                                        GLuint tex_src_target,
 206                                        GLuint tex_shadow,
 207                                        struct prog_src_register src0,
 208                                        struct prog_src_register src1,
 209                                        struct prog_src_register src2 )
 210 {
 211    struct prog_instruction *inst = get_fp_inst(c);
 212
 213    assert(tex_src_unit < BRW_MAX_TEX_UNIT ||
 214           tex_src_unit == TEX_UNIT_NONE);
 215    assert(tex_src_target < NUM_TEXTURE_TARGETS ||
 216           tex_src_target == TEX_TARGET_NONE);
 217
 218    memset(inst, 0, sizeof(*inst));
 219
 220    inst->Opcode = op;
 221    inst->DstReg = dest;
 222    inst->SaturateMode = saturate;
 223    inst->TexSrcUnit = tex_src_unit;
 224    inst->TexSrcTarget = tex_src_target;
 225    inst->TexShadow = tex_shadow;
 226    inst->SrcReg[0] = src0;
 227    inst->SrcReg[1] = src1;
 228    inst->SrcReg[2] = src2;
 229    return inst;
 230 }
 231
 232
 233 static struct prog_instruction * emit_op(struct brw_wm_compile *c,
 234                                        GLuint op,
 235                                        struct prog_dst_register dest,
 236                                        GLuint saturate,
 237                                        struct prog_src_register src0,
 238                                        struct prog_src_register src1,
 239                                        struct prog_src_register src2 )
 240 {
 241    return emit_tex_op(c, op, dest, saturate,
 242                       TEX_UNIT_NONE, TEX_TARGET_NONE, 0,  /* unit, tgt, shadow */
 243                       src0, src1, src2);
 244 }
 245
 246
 247 /* Many Mesa opcodes produce the same value across all the result channels.
 248  * We'd rather not have to support that splatting in the opcode implementations,
 249  * and brw_wm_pass*.c wants to optimize them out by shuffling references around
 250  * anyway.  We can easily get both by emitting the opcode to one channel, and
 251  * then MOVing it to the others, which brw_wm_pass*.c already understands.
 252  */
 253 static struct prog_instruction *emit_scalar_insn(struct brw_wm_compile *c,
 254                                                  const struct prog_instruction *inst0)
 255 {
 256    struct prog_instruction *inst;
 257    unsigned int dst_chan;
 258    unsigned int other_channel_mask;
 259
 260    if (inst0->DstReg.WriteMask == 0)
 261       return NULL;
 262
 263    dst_chan = _mesa_ffs(inst0->DstReg.WriteMask) - 1;
 264    inst = get_fp_inst(c);
 265    *inst = *inst0;
 266    inst->DstReg.WriteMask = 1 << dst_chan;
 267
 268    other_channel_mask = inst0->DstReg.WriteMask & ~(1 << dst_chan);
 269    if (other_channel_mask != 0) {
 270       inst = emit_op(c,
 271                      OPCODE_MOV,
 272                      dst_mask(inst0->DstReg, other_channel_mask),
 273                      0,
 274                      src_swizzle1(src_reg_from_dst(inst0->DstReg), dst_chan),
 275                      src_undef(),
 276                      src_undef());
 277    }
 278    return inst;
 279 }
 280
 281
 282 /***********************************************************************
 283  * Special instructions for interpolation and other tasks
 284  */
 285
 286 static struct prog_src_register get_pixel_xy( struct brw_wm_compile *c )
 287 {
 288    if (src_is_undef(c->pixel_xy)) {
 289       struct prog_dst_register pixel_xy = get_temp(c);
 290       struct prog_src_register payload_r0_depth = src_reg(PROGRAM_PAYLOAD, PAYLOAD_DEPTH);
 291
 292
 293       /* Emit the out calculations, and hold onto the results.  Use
 294        * two instructions as a temporary is required.
 295        */
 296       /* pixel_xy.xy = PIXELXY payload[0];
 297        */
 298       emit_op(c,
 299               WM_PIXELXY,
 300               dst_mask(pixel_xy, WRITEMASK_XY),
 301               0,
 302               payload_r0_depth,
 303               src_undef(),
 304               src_undef());
 305
 306       c->pixel_xy = src_reg_from_dst(pixel_xy);
 307    }
 308
 309    return c->pixel_xy;
 310 }
 311
 312 static struct prog_src_register get_delta_xy( struct brw_wm_compile *c )
 313 {
 314    if (src_is_undef(c->delta_xy)) {
 315       struct prog_dst_register delta_xy = get_temp(c);
 316       struct prog_src_register pixel_xy = get_pixel_xy(c);
 317       struct prog_src_register payload_r0_depth = src_reg(PROGRAM_PAYLOAD, PAYLOAD_DEPTH);
 318
 319       /* deltas.xy = DELTAXY pixel_xy, payload[0]
 320        */
 321       emit_op(c,
 322               WM_DELTAXY,
 323               dst_mask(delta_xy, WRITEMASK_XY),
 324               0,
 325               pixel_xy,
 326               payload_r0_depth,
 327               src_undef());
 328
 329       c->delta_xy = src_reg_from_dst(delta_xy);
 330    }
 331
 332    return c->delta_xy;
 333 }
 334
 335 static struct prog_src_register get_pixel_w( struct brw_wm_compile *c )
 336 {
 337    /* This is called for producing 1/w in pre-gen6 interp.  for gen6,
 338     * the interp opcodes don't use this argument.  But to keep the
 339     * nr_args = 3 expectations of pinterp happy, just stuff delta_xy
 340     * into the slot.
 341     */
 342    if (c->func.brw->intel.gen >= 6)
 343       return c->delta_xy;
 344
 345    if (src_is_undef(c->pixel_w)) {
 346       struct prog_dst_register pixel_w = get_temp(c);
 347       struct prog_src_register deltas = get_delta_xy(c);
 348       struct prog_src_register interp_wpos = src_reg(PROGRAM_PAYLOAD, FRAG_ATTRIB_WPOS);
 349
 350       /* deltas.xyw = DELTAS2 deltas.xy, payload.interp_wpos.x
 351        */
 352       emit_op(c,
 353               WM_PIXELW,
 354               dst_mask(pixel_w, WRITEMASK_W),
 355               0,
 356               interp_wpos,
 357               deltas,
 358               src_undef());
 359
 360
 361       c->pixel_w = src_reg_from_dst(pixel_w);
 362    }
 363
 364    return c->pixel_w;
 365 }
 366
 367 static void emit_interp( struct brw_wm_compile *c,
 368                          GLuint idx )
 369 {
 370    struct prog_dst_register dst = dst_reg(PROGRAM_INPUT, idx);
 371    struct prog_src_register interp = src_reg(PROGRAM_PAYLOAD, idx);
 372    struct prog_src_register deltas;
 373
 374    deltas = get_delta_xy(c);
 375
 376    /* Need to use PINTERP on attributes which have been
 377     * multiplied by 1/W in the SF program, and LINTERP on those
 378     * which have not:
 379     */
 380    switch (idx) {
 381    case FRAG_ATTRIB_WPOS:
 382       /* Have to treat wpos.xy specially:
 383        */
 384       emit_op(c,
 385               WM_WPOSXY,
 386               dst_mask(dst, WRITEMASK_XY),
 387               0,
 388               get_pixel_xy(c),
 389               src_undef(),
 390               src_undef());
 391
 392       dst = dst_mask(dst, WRITEMASK_ZW);
 393
 394       /* PROGRAM_INPUT.attr.xyzw = INTERP payload.interp[attr].x, deltas.xyw
 395        */
 396       emit_op(c,
 397               WM_LINTERP,
 398               dst,
 399               0,
 400               interp,
 401               deltas,
 402               src_undef());
 403       break;
 404    case FRAG_ATTRIB_COL0:
 405    case FRAG_ATTRIB_COL1:
 406       if (c->key.flat_shade) {
 407          emit_op(c,
 408                  WM_CINTERP,
 409                  dst,
 410                  0,
 411                  interp,
 412                  src_undef(),
 413                  src_undef());
 414       }
 415       else {
 416          /* perspective-corrected color interpolation */
 417          emit_op(c,
 418                  WM_PINTERP,
 419                  dst,
 420                  0,
 421                  interp,
 422                  deltas,
 423                  get_pixel_w(c));
 424       }
 425       break;
 426    case FRAG_ATTRIB_FOGC:
 427       /* Interpolate the fog coordinate */
 428       emit_op(c,
 429               WM_PINTERP,
 430               dst_mask(dst, WRITEMASK_X),
 431               0,
 432               interp,
 433               deltas,
 434               get_pixel_w(c));
 435
 436       emit_op(c,
 437               OPCODE_MOV,
 438               dst_mask(dst, WRITEMASK_YZW),
 439               0,
 440               src_swizzle(interp,
 441                           SWIZZLE_ZERO,
 442                           SWIZZLE_ZERO,
 443                           SWIZZLE_ZERO,
 444                           SWIZZLE_ONE),
 445               src_undef(),
 446               src_undef());
 447       break;
 448
 449    case FRAG_ATTRIB_FACE:
 450       emit_op(c,
 451               WM_FRONTFACING,
 452               dst_mask(dst, WRITEMASK_X),
 453               0,
 454               src_undef(),
 455               src_undef(),
 456               src_undef());
 457       break;
 458
 459    case FRAG_ATTRIB_PNTC:
 460       /* XXX review/test this case */
 461       emit_op(c,
 462               WM_PINTERP,
 463               dst_mask(dst, WRITEMASK_XY),
 464               0,
 465               interp,
 466               deltas,
 467               get_pixel_w(c));
 468
 469       emit_op(c,
 470               OPCODE_MOV,
 471               dst_mask(dst, WRITEMASK_ZW),
 472               0,
 473               src_swizzle(interp,
 474                           SWIZZLE_ZERO,
 475                           SWIZZLE_ZERO,
 476                           SWIZZLE_ZERO,
 477                           SWIZZLE_ONE),
 478               src_undef(),
 479               src_undef());
 480       break;
 481
 482    default:
 483       emit_op(c,
 484               WM_PINTERP,
 485               dst,
 486               0,
 487               interp,
 488               deltas,
 489               get_pixel_w(c));
 490       break;
 491    }
 492
 493    c->fp_interp_emitted |= 1<<idx;
 494 }
 495
 496 /***********************************************************************
 497  * Hacks to extend the program parameter and constant lists.
 498  */
 499
 500 /* Add the fog parameters to the parameter list of the original
 501  * program, rather than creating a new list.  Doesn't really do any
 502  * harm and it's not as if the parameter handling isn't a big hack
 503  * anyway.
 504  */
 505 static struct prog_src_register search_or_add_param5(struct brw_wm_compile *c,
 506                                                      GLint s0,
 507                                                      GLint s1,
 508                                                      GLint s2,
 509                                                      GLint s3,
 510                                                      GLint s4)
 511 {
 512    struct gl_program_parameter_list *paramList = c->fp->program.Base.Parameters;
 513    gl_state_index tokens[STATE_LENGTH];
 514    GLuint idx;
 515    tokens[0] = s0;
 516    tokens[1] = s1;
 517    tokens[2] = s2;
 518    tokens[3] = s3;
 519    tokens[4] = s4;
 520
 521    idx = _mesa_add_state_reference( paramList, tokens );
 522
 523    return src_reg(PROGRAM_STATE_VAR, idx);
 524 }
 525
 526
 527 static struct prog_src_register search_or_add_const4f( struct brw_wm_compile *c,
 528                                                      GLfloat s0,
 529                                                      GLfloat s1,
 530                                                      GLfloat s2,
 531                                                      GLfloat s3)
 532 {
 533    struct gl_program_parameter_list *paramList = c->fp->program.Base.Parameters;
 534    gl_constant_value values[4];
 535    GLuint idx;
 536    GLuint swizzle;
 537    struct prog_src_register reg;
 538
 539    values[0].f = s0;
 540    values[1].f = s1;
 541    values[2].f = s2;
 542    values[3].f = s3;
 543
 544    idx = _mesa_add_unnamed_constant( paramList, values, 4, &swizzle );
 545    reg = src_reg(PROGRAM_STATE_VAR, idx);
 546    reg.Swizzle = swizzle;
 547
 548    return reg;
 549 }
 550
 551
 552
 553 /***********************************************************************
 554  * Expand various instructions here to simpler forms.
 555  */
 556 static void precalc_dst( struct brw_wm_compile *c,
 557                                const struct prog_instruction *inst )
 558 {
 559    struct prog_src_register src0 = inst->SrcReg[0];
 560    struct prog_src_register src1 = inst->SrcReg[1];
 561    struct prog_dst_register dst = inst->DstReg;
 562    struct prog_dst_register temp = get_temp(c);
 563
 564    if (dst.WriteMask & WRITEMASK_Y) {
 565       /* dst.y = mul src0.y, src1.y
 566        */
 567       emit_op(c,
 568               OPCODE_MUL,
 569               dst_mask(temp, WRITEMASK_Y),
 570               inst->SaturateMode,
 571               src0,
 572               src1,
 573               src_undef());
 574    }
 575
 576    if (dst.WriteMask & WRITEMASK_XZ) {
 577       struct prog_instruction *swz;
 578       GLuint z = GET_SWZ(src0.Swizzle, Z);
 579
 580       /* dst.xz = swz src0.1zzz
 581        */
 582       swz = emit_op(c,
 583                     OPCODE_SWZ,
 584                     dst_mask(temp, WRITEMASK_XZ),
 585                     inst->SaturateMode,
 586                     src_swizzle(src0, SWIZZLE_ONE, z, z, z),
 587                     src_undef(),
 588                     src_undef());
 589       /* Avoid letting negation flag of src0 affect our 1 constant. */
 590       swz->SrcReg[0].Negate &= ~NEGATE_X;
 591    }
 592    if (dst.WriteMask & WRITEMASK_W) {
 593       /* dst.w = mov src1.w
 594        */
 595       emit_op(c,
 596               OPCODE_MOV,
 597               dst_mask(temp, WRITEMASK_W),
 598               inst->SaturateMode,
 599               src1,
 600               src_undef(),
 601               src_undef());
 602    }
 603
 604    /* This will get optimized out in general, but it ensures that we
 605     * don't overwrite src operands in our channel-wise splitting
 606     * above.  See piglit fp-dst-aliasing-[12].
 607     */
 608    emit_op(c,
 609            OPCODE_MOV,
 610            dst,
 611            0,
 612            src_reg_from_dst(temp),
 613            src_undef(),
 614            src_undef());
 615
 616    release_temp(c, temp);
 617 }
 618
 619
 620 static void precalc_lit( struct brw_wm_compile *c,
 621                          const struct prog_instruction *inst )
 622 {
 623    struct prog_src_register src0 = inst->SrcReg[0];
 624    struct prog_dst_register dst = inst->DstReg;
 625
 626    if (dst.WriteMask & WRITEMASK_YZ) {
 627       emit_op(c,
 628               OPCODE_LIT,
 629               dst_mask(dst, WRITEMASK_YZ),
 630               inst->SaturateMode,
 631               src0,
 632               src_undef(),
 633               src_undef());
 634    }
 635
 636    if (dst.WriteMask & WRITEMASK_XW) {
 637       struct prog_instruction *swz;
 638
 639       /* dst.xw = swz src0.1111
 640        */
 641       swz = emit_op(c,
 642                     OPCODE_SWZ,
 643                     dst_mask(dst, WRITEMASK_XW),
 644                     0,
 645                     src_swizzle1(src0, SWIZZLE_ONE),
 646                     src_undef(),
 647                     src_undef());
 648       /* Avoid letting the negation flag of src0 affect our 1 constant. */
 649       swz->SrcReg[0].Negate = NEGATE_NONE;
 650    }
 651 }
 652
 653
 654 /**
 655  * Some TEX instructions require extra code, cube map coordinate
 656  * normalization, or coordinate scaling for RECT textures, etc.
 657  * This function emits those extra instructions and the TEX
 658  * instruction itself.
 659  */
 660 static void precalc_tex( struct brw_wm_compile *c,
 661                          const struct prog_instruction *inst )
 662 {
 663    struct brw_compile *p = &c->func;
 664    struct intel_context *intel = &p->brw->intel;
 665    struct prog_src_register coord;
 666    struct prog_dst_register tmpcoord = { 0 };
 667    const GLuint unit = c->fp->program.Base.SamplerUnits[inst->TexSrcUnit];
 668
 669    assert(unit < BRW_MAX_TEX_UNIT);
 670
 671    if (inst->TexSrcTarget == TEXTURE_CUBE_INDEX) {
 672        struct prog_instruction *out;
 673        struct prog_dst_register tmp0 = get_temp(c);
 674        struct prog_src_register tmp0src = src_reg_from_dst(tmp0);
 675        struct prog_dst_register tmp1 = get_temp(c);
 676        struct prog_src_register tmp1src = src_reg_from_dst(tmp1);
 677        struct prog_src_register src0 = inst->SrcReg[0];
 678
 679        /* find longest component of coord vector and normalize it */
 680        tmpcoord = get_temp(c);
 681        coord = src_reg_from_dst(tmpcoord);
 682
 683        /* tmpcoord = src0 (i.e.: coord = src0) */
 684        out = emit_op(c, OPCODE_MOV,
 685                      tmpcoord,
 686                      0,
 687                      src0,
 688                      src_undef(),
 689                      src_undef());
 690        out->SrcReg[0].Negate = NEGATE_NONE;
 691        out->SrcReg[0].Abs = 1;
 692
 693        /* tmp0 = MAX(coord.X, coord.Y) */
 694        emit_op(c, OPCODE_MAX,
 695                tmp0,
 696                0,
 697                src_swizzle1(coord, X),
 698                src_swizzle1(coord, Y),
 699                src_undef());
 700
 701        /* tmp1 = MAX(tmp0, coord.Z) */
 702        emit_op(c, OPCODE_MAX,
 703                tmp1,
 704                0,
 705                tmp0src,
 706                src_swizzle1(coord, Z),
 707                src_undef());
 708
 709        /* tmp0 = 1 / tmp1 */
 710        emit_op(c, OPCODE_RCP,
 711                dst_mask(tmp0, WRITEMASK_X),
 712                0,
 713                tmp1src,
 714                src_undef(),
 715                src_undef());
 716
 717        /* tmpCoord = src0 * tmp0 */
 718        emit_op(c, OPCODE_MUL,
 719                tmpcoord,
 720                0,
 721                src0,
 722                src_swizzle1(tmp0src, SWIZZLE_X),
 723                src_undef());
 724
 725        release_temp(c, tmp0);
 726        release_temp(c, tmp1);
 727    }
 728    else if (intel->gen < 6 && inst->TexSrcTarget == TEXTURE_RECT_INDEX) {
 729       struct prog_src_register scale =
 730          search_or_add_param5( c,
 731                                STATE_INTERNAL,
 732                                STATE_TEXRECT_SCALE,
 733                                unit,
 734                                0,0 );
 735
 736       tmpcoord = get_temp(c);
 737
 738       /* coord.xy   = MUL inst->SrcReg[0], { 1/width, 1/height }
 739        */
 740       emit_op(c,
 741               OPCODE_MUL,
 742               tmpcoord,
 743               0,
 744               inst->SrcReg[0],
 745               src_swizzle(scale,
 746                           SWIZZLE_X,
 747                           SWIZZLE_Y,
 748                           SWIZZLE_ONE,
 749                           SWIZZLE_ONE),
 750               src_undef());
 751
 752       coord = src_reg_from_dst(tmpcoord);
 753    }
 754    else {
 755       coord = inst->SrcReg[0];
 756    }
 757
 758    /* Need to emit YUV texture conversions by hand.  Probably need to
 759     * do this here - the alternative is in brw_wm_emit.c, but the
 760     * conversion requires allocating a temporary variable which we
 761     * don't have the facility to do that late in the compilation.
 762     */
 763    if (c->key.yuvtex_mask & (1 << unit)) {
 764       /* convert ycbcr to RGBA */
 765       bool  swap_uv = c->key.yuvtex_swap_mask & (1<<unit);
 766
 767       /*
 768          CONST C0 = { -.5, -.0625,  -.5, 1.164 }
 769          CONST C1 = { 1.596, -0.813, 2.018, -.391 }
 770          UYV     = TEX ...
 771          UYV.xyz = ADD UYV,     C0
 772          UYV.y   = MUL UYV.y,   C0.w
 773          if (UV swaped)
 774             RGB.xyz = MAD UYV.zzx, C1,   UYV.y
 775          else
 776             RGB.xyz = MAD UYV.xxz, C1,   UYV.y
 777          RGB.y   = MAD UYV.z,   C1.w, RGB.y
 778       */
 779       struct prog_dst_register dst = inst->DstReg;
 780       struct prog_dst_register tmp = get_temp(c);
 781       struct prog_src_register tmpsrc = src_reg_from_dst(tmp);
 782       struct prog_src_register C0 = search_or_add_const4f( c,  -.5, -.0625, -.5, 1.164 );
 783       struct prog_src_register C1 = search_or_add_const4f( c, 1.596, -0.813, 2.018, -.391 );
 784
 785       /* tmp     = TEX ...
 786        */
 787       emit_tex_op(c,
 788                   OPCODE_TEX,
 789                   tmp,
 790                   inst->SaturateMode,
 791                   unit,
 792                   inst->TexSrcTarget,
 793                   inst->TexShadow,
 794                   coord,
 795                   src_undef(),
 796                   src_undef());
 797
 798       /* tmp.xyz =  ADD TMP, C0
 799        */
 800       emit_op(c,
 801               OPCODE_ADD,
 802               dst_mask(tmp, WRITEMASK_XYZ),
 803               0,
 804               tmpsrc,
 805               C0,
 806               src_undef());
 807
 808       /* YUV.y   = MUL YUV.y, C0.w
 809        */
 810
 811       emit_op(c,
 812               OPCODE_MUL,
 813               dst_mask(tmp, WRITEMASK_Y),
 814               0,
 815               tmpsrc,
 816               src_swizzle1(C0, W),
 817               src_undef());
 818
 819       /*
 820        * if (UV swaped)
 821        *     RGB.xyz = MAD YUV.zzx, C1, YUV.y
 822        * else
 823        *     RGB.xyz = MAD YUV.xxz, C1, YUV.y
 824        */
 825
 826       emit_op(c,
 827               OPCODE_MAD,
 828               dst_mask(dst, WRITEMASK_XYZ),
 829               0,
 830               swap_uv?src_swizzle(tmpsrc, Z,Z,X,X):src_swizzle(tmpsrc, X,X,Z,Z),
 831               C1,
 832               src_swizzle1(tmpsrc, Y));
 833
 834       /*  RGB.y   = MAD YUV.z, C1.w, RGB.y
 835        */
 836       emit_op(c,
 837               OPCODE_MAD,
 838               dst_mask(dst, WRITEMASK_Y),
 839               0,
 840               src_swizzle1(tmpsrc, Z),
 841               src_swizzle1(C1, W),
 842               src_swizzle1(src_reg_from_dst(dst), Y));
 843
 844       release_temp(c, tmp);
 845    }
 846    else {
 847       /* ordinary RGBA tex instruction */
 848       emit_tex_op(c,
 849                   OPCODE_TEX,
 850                   inst->DstReg,
 851                   inst->SaturateMode,
 852                   unit,
 853                   inst->TexSrcTarget,
 854                   inst->TexShadow,
 855                   coord,
 856                   src_undef(),
 857                   src_undef());
 858    }
 859
 860    /* For GL_EXT_texture_swizzle: */
 861    if (c->key.tex_swizzles[unit] != SWIZZLE_NOOP) {
 862       /* swizzle the result of the TEX instruction */
 863       struct prog_src_register tmpsrc = src_reg_from_dst(inst->DstReg);
 864       emit_op(c, OPCODE_SWZ,
 865               inst->DstReg,
 866               SATURATE_OFF, /* saturate already done above */
 867               src_swizzle4(tmpsrc, c->key.tex_swizzles[unit]),
 868               src_undef(),
 869               src_undef());
 870    }
 871
 872    if ((inst->TexSrcTarget == TEXTURE_RECT_INDEX) ||
 873        (inst->TexSrcTarget == TEXTURE_CUBE_INDEX))
 874       release_temp(c, tmpcoord);
 875 }
 876
 877
 878 /**
 879  * Check if the given TXP instruction really needs the divide-by-W step.
 880  */
 881 static bool
 882 projtex(struct brw_wm_compile *c, const struct prog_instruction *inst)
 883 {
 884    const struct prog_src_register src = inst->SrcReg[0];
 885    bool retVal;
 886
 887    assert(inst->Opcode == OPCODE_TXP);
 888
 889    /* Only try to detect the simplest cases.  Could detect (later)
 890     * cases where we are trying to emit code like RCP {1.0}, MUL x,
 891     * {1.0}, and so on.
 892     *
 893     * More complex cases than this typically only arise from
 894     * user-provided fragment programs anyway:
 895     */
 896    if (inst->TexSrcTarget == TEXTURE_CUBE_INDEX)
 897       retVal = false;  /* ut2004 gun rendering !?! */
 898    else if (src.File == PROGRAM_INPUT &&
 899             GET_SWZ(src.Swizzle, W) == W &&
 900             (c->key.proj_attrib_mask & (1 << src.Index)) == 0)
 901       retVal = false;
 902    else
 903       retVal = true;
 904
 905    return retVal;
 906 }
 907
 908
 909 /**
 910  * Emit code for TXP.
 911  */
 912 static void precalc_txp( struct brw_wm_compile *c,
 913                                const struct prog_instruction *inst )
 914 {
 915    struct prog_src_register src0 = inst->SrcReg[0];
 916
 917    if (projtex(c, inst)) {
 918       struct prog_dst_register tmp = get_temp(c);
 919       struct prog_instruction tmp_inst;
 920
 921       /* tmp0.w = RCP inst.arg[0][3]
 922        */
 923       emit_op(c,
 924               OPCODE_RCP,
 925               dst_mask(tmp, WRITEMASK_W),
 926               0,
 927               src_swizzle1(src0, GET_SWZ(src0.Swizzle, W)),
 928               src_undef(),
 929               src_undef());
 930
 931       /* tmp0.xyz =  MUL inst.arg[0], tmp0.wwww
 932        */
 933       emit_op(c,
 934               OPCODE_MUL,
 935               dst_mask(tmp, WRITEMASK_XYZ),
 936               0,
 937               src0,
 938               src_swizzle1(src_reg_from_dst(tmp), W),
 939               src_undef());
 940
 941       /* dst = precalc(TEX tmp0)
 942        */
 943       tmp_inst = *inst;
 944       tmp_inst.SrcReg[0] = src_reg_from_dst(tmp);
 945       precalc_tex(c, &tmp_inst);
 946
 947       release_temp(c, tmp);
 948    }
 949    else
 950    {
 951       /* dst = precalc(TEX src0)
 952        */
 953       precalc_tex(c, inst);
 954    }
 955 }
 956
 957
 958
 959 static void emit_render_target_writes( struct brw_wm_compile *c )
 960 {
 961    struct prog_src_register payload_r0_depth = src_reg(PROGRAM_PAYLOAD, PAYLOAD_DEPTH);
 962    struct prog_src_register outdepth = src_reg(PROGRAM_OUTPUT, FRAG_RESULT_DEPTH);
 963    struct prog_src_register outcolor;
 964    GLuint i;
 965
 966    struct prog_instruction *inst = NULL;
 967
 968    /* The inst->Aux field is used for FB write target and the EOT marker */
 969
 970    for (i = 0; i < c->key.nr_color_regions; i++) {
 971       if (c->fp->program.Base.OutputsWritten & (1 << FRAG_RESULT_COLOR)) {
 972          outcolor = src_reg(PROGRAM_OUTPUT, FRAG_RESULT_COLOR);
 973       } else {
 974          outcolor = src_reg(PROGRAM_OUTPUT, FRAG_RESULT_DATA0 + i);
 975       }
 976       inst = emit_op(c, WM_FB_WRITE, dst_mask(dst_undef(), 0),
 977                      0, outcolor, payload_r0_depth, outdepth);
 978       inst->Aux = INST_AUX_TARGET(i);
 979    }
 980
 981    /* Mark the last FB write as final, or emit a dummy write if we had
 982     * no render targets bound.
 983     */
 984    if (c->key.nr_color_regions != 0) {
 985       inst->Aux |= INST_AUX_EOT;
 986    } else {
 987       inst = emit_op(c, WM_FB_WRITE, dst_mask(dst_undef(), 0),
 988                      0, src_reg(PROGRAM_OUTPUT, FRAG_RESULT_COLOR),
 989                      payload_r0_depth, outdepth);
 990       inst->Aux = INST_AUX_TARGET(0) | INST_AUX_EOT;
 991    }
 992 }
 993
 994
 995
 996
 997 /***********************************************************************
 998  * Emit INTERP instructions ahead of first use of each attrib.
 999  */
1000
1001 static void validate_src_regs( struct brw_wm_compile *c,
1002                                const struct prog_instruction *inst )
1003 {
1004    GLuint nr_args = brw_wm_nr_args( inst->Opcode );
1005    GLuint i;
1006
1007    for (i = 0; i < nr_args; i++) {
1008       if (inst->SrcReg[i].File == PROGRAM_INPUT) {
1009          GLuint idx = inst->SrcReg[i].Index;
1010          if (!(c->fp_interp_emitted & (1<<idx))) {
1011             emit_interp(c, idx);
1012          }
1013       }
1014    }
1015 }
1016
1017 static void print_insns( const struct prog_instruction *insn,
1018                          GLuint nr )
1019 {
1020    GLuint i;
1021    for (i = 0; i < nr; i++, insn++) {
1022       printf("%3d: ", i);
1023       if (insn->Opcode < MAX_OPCODE)
1024          _mesa_fprint_instruction_opt(stdout, insn, 0, PROG_PRINT_DEBUG, NULL);
1025       else if (insn->Opcode < MAX_WM_OPCODE) {
1026          GLuint idx = insn->Opcode - MAX_OPCODE;
1027
1028          _mesa_fprint_alu_instruction(stdout, insn, wm_opcode_strings[idx],
1029                                       3, PROG_PRINT_DEBUG, NULL);
1030       }
1031       else
1032          printf("965 Opcode %d\n", insn->Opcode);
1033    }
1034 }
1035
1036
1037 /**
1038  * Initial pass for fragment program code generation.
1039  * This function is used by both the GLSL and non-GLSL paths.
1040  */
1041 void brw_wm_pass_fp( struct brw_wm_compile *c )
1042 {
1043    struct intel_context *intel = &c->func.brw->intel;
1044    struct brw_fragment_program *fp = c->fp;
1045    GLuint insn;
1046
1047    if (unlikely(INTEL_DEBUG & DEBUG_WM)) {
1048       printf("pre-fp:\n");
1049       _mesa_fprint_program_opt(stdout, &fp->program.Base, PROG_PRINT_DEBUG,
1050                                true);
1051       printf("\n");
1052    }
1053
1054    c->pixel_xy = src_undef();
1055    if (intel->gen >= 6) {
1056       /* The interpolation deltas come in as the perspective pixel
1057        * location barycentric params.
1058        */
1059       c->delta_xy = src_reg(PROGRAM_PAYLOAD, PAYLOAD_DEPTH);
1060    } else {
1061       c->delta_xy = src_undef();
1062    }
1063    c->pixel_w = src_undef();
1064    c->nr_fp_insns = 0;
1065
1066    /* Emit preamble instructions.  This is where special instructions such as
1067     * WM_CINTERP, WM_LINTERP, WM_PINTERP and WM_WPOSXY are emitted to
1068     * compute shader inputs from varying vars.
1069     */
1070    for (insn = 0; insn < fp->program.Base.NumInstructions; insn++) {
1071       const struct prog_instruction *inst = &fp->program.Base.Instructions[insn];
1072       validate_src_regs(c, inst);
1073    }
1074
1075    /* Loop over all instructions doing assorted simplifications and
1076     * transformations.
1077     */
1078    for (insn = 0; insn < fp->program.Base.NumInstructions; insn++) {
1079       const struct prog_instruction *inst = &fp->program.Base.Instructions[insn];
1080       struct prog_instruction *out;
1081
1082       /* Check for INPUT values, emit INTERP instructions where
1083        * necessary:
1084        */
1085
1086       switch (inst->Opcode) {
1087       case OPCODE_SWZ:
1088          out = emit_insn(c, inst);
1089          out->Opcode = OPCODE_MOV;
1090          break;
1091
1092       case OPCODE_ABS:
1093          out = emit_insn(c, inst);
1094          out->Opcode = OPCODE_MOV;
1095          out->SrcReg[0].Negate = NEGATE_NONE;
1096          out->SrcReg[0].Abs = 1;
1097          break;
1098
1099       case OPCODE_SUB:
1100          out = emit_insn(c, inst);
1101          out->Opcode = OPCODE_ADD;
1102          out->SrcReg[1].Negate ^= NEGATE_XYZW;
1103          break;
1104
1105       case OPCODE_SCS:
1106          out = emit_insn(c, inst);
1107          /* This should probably be done in the parser.
1108           */
1109          out->DstReg.WriteMask &= WRITEMASK_XY;
1110          break;
1111
1112       case OPCODE_DST:
1113          precalc_dst(c, inst);
1114          break;
1115
1116       case OPCODE_LIT:
1117          precalc_lit(c, inst);
1118          break;
1119
1120       case OPCODE_RSQ:
1121          out = emit_scalar_insn(c, inst);
1122          out->SrcReg[0].Abs = true;
1123          break;
1124
1125       case OPCODE_TEX:
1126          precalc_tex(c, inst);
1127          break;
1128
1129       case OPCODE_TXP:
1130          precalc_txp(c, inst);
1131          break;
1132
1133       case OPCODE_TXB:
1134          out = emit_insn(c, inst);
1135          out->TexSrcUnit = fp->program.Base.SamplerUnits[inst->TexSrcUnit];
1136          assert(out->TexSrcUnit < BRW_MAX_TEX_UNIT);
1137          break;
1138
1139       case OPCODE_XPD:
1140          out = emit_insn(c, inst);
1141          /* This should probably be done in the parser.
1142           */
1143          out->DstReg.WriteMask &= WRITEMASK_XYZ;
1144          break;
1145
1146       case OPCODE_KIL:
1147          out = emit_insn(c, inst);
1148          /* This should probably be done in the parser.
1149           */
1150          out->DstReg.WriteMask = 0;
1151          break;
1152       case OPCODE_END:
1153          emit_render_target_writes(c);
1154          break;
1155       case OPCODE_PRINT:
1156          break;
1157       default:
1158          if (brw_wm_is_scalar_result(inst->Opcode))
1159             emit_scalar_insn(c, inst);
1160          else
1161             emit_insn(c, inst);
1162          break;
1163       }
1164    }
1165
1166    if (unlikely(INTEL_DEBUG & DEBUG_WM)) {
1167       printf("pass_fp:\n");
1168       print_insns( c->prog_instructions, c->nr_fp_insns );
1169       printf("\n");
1170    }
1171 }
1172