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 GLboolean 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    /* update mask of which texture units are referenced by this program */
 219    if (tex_src_unit != TEX_UNIT_NONE)
 220       c->fp->tex_units_used |= (1 << tex_src_unit);
 221
 222    memset(inst, 0, sizeof(*inst));
 223
 224    inst->Opcode = op;
 225    inst->DstReg = dest;
 226    inst->SaturateMode = saturate;
 227    inst->TexSrcUnit = tex_src_unit;
 228    inst->TexSrcTarget = tex_src_target;
 229    inst->TexShadow = tex_shadow;
 230    inst->SrcReg[0] = src0;
 231    inst->SrcReg[1] = src1;
 232    inst->SrcReg[2] = src2;
 233    return inst;
 234 }
 235
 236
 237 static struct prog_instruction * emit_op(struct brw_wm_compile *c,
 238                                        GLuint op,
 239                                        struct prog_dst_register dest,
 240                                        GLuint saturate,
 241                                        struct prog_src_register src0,
 242                                        struct prog_src_register src1,
 243                                        struct prog_src_register src2 )
 244 {
 245    return emit_tex_op(c, op, dest, saturate,
 246                       TEX_UNIT_NONE, TEX_TARGET_NONE, 0,  /* unit, tgt, shadow */
 247                       src0, src1, src2);
 248 }
 249
 250
 251 /* Many Mesa opcodes produce the same value across all the result channels.
 252  * We'd rather not have to support that splatting in the opcode implementations,
 253  * and brw_wm_pass*.c wants to optimize them out by shuffling references around
 254  * anyway.  We can easily get both by emitting the opcode to one channel, and
 255  * then MOVing it to the others, which brw_wm_pass*.c already understands.
 256  */
 257 static struct prog_instruction *emit_scalar_insn(struct brw_wm_compile *c,
 258                                                  const struct prog_instruction *inst0)
 259 {
 260    struct prog_instruction *inst;
 261    unsigned int dst_chan;
 262    unsigned int other_channel_mask;
 263
 264    if (inst0->DstReg.WriteMask == 0)
 265       return NULL;
 266
 267    dst_chan = _mesa_ffs(inst0->DstReg.WriteMask) - 1;
 268    inst = get_fp_inst(c);
 269    *inst = *inst0;
 270    inst->DstReg.WriteMask = 1 << dst_chan;
 271
 272    other_channel_mask = inst0->DstReg.WriteMask & ~(1 << dst_chan);
 273    if (other_channel_mask != 0) {
 274       inst = emit_op(c,
 275                      OPCODE_MOV,
 276                      dst_mask(inst0->DstReg, other_channel_mask),
 277                      0,
 278                      src_swizzle1(src_reg_from_dst(inst0->DstReg), dst_chan),
 279                      src_undef(),
 280                      src_undef());
 281    }
 282    return inst;
 283 }
 284
 285
 286 /***********************************************************************
 287  * Special instructions for interpolation and other tasks
 288  */
 289
 290 static struct prog_src_register get_pixel_xy( struct brw_wm_compile *c )
 291 {
 292    if (src_is_undef(c->pixel_xy)) {
 293       struct prog_dst_register pixel_xy = get_temp(c);
 294       struct prog_src_register payload_r0_depth = src_reg(PROGRAM_PAYLOAD, PAYLOAD_DEPTH);
 295
 296
 297       /* Emit the out calculations, and hold onto the results.  Use
 298        * two instructions as a temporary is required.
 299        */
 300       /* pixel_xy.xy = PIXELXY payload[0];
 301        */
 302       emit_op(c,
 303               WM_PIXELXY,
 304               dst_mask(pixel_xy, WRITEMASK_XY),
 305               0,
 306               payload_r0_depth,
 307               src_undef(),
 308               src_undef());
 309
 310       c->pixel_xy = src_reg_from_dst(pixel_xy);
 311    }
 312
 313    return c->pixel_xy;
 314 }
 315
 316 static struct prog_src_register get_delta_xy( struct brw_wm_compile *c )
 317 {
 318    if (src_is_undef(c->delta_xy)) {
 319       struct prog_dst_register delta_xy = get_temp(c);
 320       struct prog_src_register pixel_xy = get_pixel_xy(c);
 321       struct prog_src_register payload_r0_depth = src_reg(PROGRAM_PAYLOAD, PAYLOAD_DEPTH);
 322
 323       /* deltas.xy = DELTAXY pixel_xy, payload[0]
 324        */
 325       emit_op(c,
 326               WM_DELTAXY,
 327               dst_mask(delta_xy, WRITEMASK_XY),
 328               0,
 329               pixel_xy,
 330               payload_r0_depth,
 331               src_undef());
 332
 333       c->delta_xy = src_reg_from_dst(delta_xy);
 334    }
 335
 336    return c->delta_xy;
 337 }
 338
 339 static struct prog_src_register get_pixel_w( struct brw_wm_compile *c )
 340 {
 341    /* This is called for producing 1/w in pre-gen6 interp.  for gen6,
 342     * the interp opcodes don't use this argument.  But to keep the
 343     * nr_args = 3 expectations of pinterp happy, just stuff delta_xy
 344     * into the slot.
 345     */
 346    if (c->func.brw->intel.gen >= 6)
 347       return c->delta_xy;
 348
 349    if (src_is_undef(c->pixel_w)) {
 350       struct prog_dst_register pixel_w = get_temp(c);
 351       struct prog_src_register deltas = get_delta_xy(c);
 352       struct prog_src_register interp_wpos = src_reg(PROGRAM_PAYLOAD, FRAG_ATTRIB_WPOS);
 353
 354       /* deltas.xyw = DELTAS2 deltas.xy, payload.interp_wpos.x
 355        */
 356       emit_op(c,
 357               WM_PIXELW,
 358               dst_mask(pixel_w, WRITEMASK_W),
 359               0,
 360               interp_wpos,
 361               deltas,
 362               src_undef());
 363
 364
 365       c->pixel_w = src_reg_from_dst(pixel_w);
 366    }
 367
 368    return c->pixel_w;
 369 }
 370
 371 static void emit_interp( struct brw_wm_compile *c,
 372                          GLuint idx )
 373 {
 374    struct prog_dst_register dst = dst_reg(PROGRAM_INPUT, idx);
 375    struct prog_src_register interp = src_reg(PROGRAM_PAYLOAD, idx);
 376    struct prog_src_register deltas;
 377
 378    deltas = get_delta_xy(c);
 379
 380    /* Need to use PINTERP on attributes which have been
 381     * multiplied by 1/W in the SF program, and LINTERP on those
 382     * which have not:
 383     */
 384    switch (idx) {
 385    case FRAG_ATTRIB_WPOS:
 386       /* Have to treat wpos.xy specially:
 387        */
 388       emit_op(c,
 389               WM_WPOSXY,
 390               dst_mask(dst, WRITEMASK_XY),
 391               0,
 392               get_pixel_xy(c),
 393               src_undef(),
 394               src_undef());
 395
 396       dst = dst_mask(dst, WRITEMASK_ZW);
 397
 398       /* PROGRAM_INPUT.attr.xyzw = INTERP payload.interp[attr].x, deltas.xyw
 399        */
 400       emit_op(c,
 401               WM_LINTERP,
 402               dst,
 403               0,
 404               interp,
 405               deltas,
 406               src_undef());
 407       break;
 408    case FRAG_ATTRIB_COL0:
 409    case FRAG_ATTRIB_COL1:
 410       if (c->key.flat_shade) {
 411          emit_op(c,
 412                  WM_CINTERP,
 413                  dst,
 414                  0,
 415                  interp,
 416                  src_undef(),
 417                  src_undef());
 418       }
 419       else {
 420          /* perspective-corrected color interpolation */
 421          emit_op(c,
 422                  WM_PINTERP,
 423                  dst,
 424                  0,
 425                  interp,
 426                  deltas,
 427                  get_pixel_w(c));
 428       }
 429       break;
 430    case FRAG_ATTRIB_FOGC:
 431       /* Interpolate the fog coordinate */
 432       emit_op(c,
 433               WM_PINTERP,
 434               dst_mask(dst, WRITEMASK_X),
 435               0,
 436               interp,
 437               deltas,
 438               get_pixel_w(c));
 439
 440       emit_op(c,
 441               OPCODE_MOV,
 442               dst_mask(dst, WRITEMASK_YZW),
 443               0,
 444               src_swizzle(interp,
 445                           SWIZZLE_ZERO,
 446                           SWIZZLE_ZERO,
 447                           SWIZZLE_ZERO,
 448                           SWIZZLE_ONE),
 449               src_undef(),
 450               src_undef());
 451       break;
 452
 453    case FRAG_ATTRIB_FACE:
 454       emit_op(c,
 455               WM_FRONTFACING,
 456               dst_mask(dst, WRITEMASK_X),
 457               0,
 458               src_undef(),
 459               src_undef(),
 460               src_undef());
 461       break;
 462
 463    case FRAG_ATTRIB_PNTC:
 464       /* XXX review/test this case */
 465       emit_op(c,
 466               WM_PINTERP,
 467               dst_mask(dst, WRITEMASK_XY),
 468               0,
 469               interp,
 470               deltas,
 471               get_pixel_w(c));
 472
 473       emit_op(c,
 474               OPCODE_MOV,
 475               dst_mask(dst, WRITEMASK_ZW),
 476               0,
 477               src_swizzle(interp,
 478                           SWIZZLE_ZERO,
 479                           SWIZZLE_ZERO,
 480                           SWIZZLE_ZERO,
 481                           SWIZZLE_ONE),
 482               src_undef(),
 483               src_undef());
 484       break;
 485
 486    default:
 487       emit_op(c,
 488               WM_PINTERP,
 489               dst,
 490               0,
 491               interp,
 492               deltas,
 493               get_pixel_w(c));
 494       break;
 495    }
 496
 497    c->fp_interp_emitted |= 1<<idx;
 498 }
 499
 500 /***********************************************************************
 501  * Hacks to extend the program parameter and constant lists.
 502  */
 503
 504 /* Add the fog parameters to the parameter list of the original
 505  * program, rather than creating a new list.  Doesn't really do any
 506  * harm and it's not as if the parameter handling isn't a big hack
 507  * anyway.
 508  */
 509 static struct prog_src_register search_or_add_param5(struct brw_wm_compile *c,
 510                                                      GLint s0,
 511                                                      GLint s1,
 512                                                      GLint s2,
 513                                                      GLint s3,
 514                                                      GLint s4)
 515 {
 516    struct gl_program_parameter_list *paramList = c->fp->program.Base.Parameters;
 517    gl_state_index tokens[STATE_LENGTH];
 518    GLuint idx;
 519    tokens[0] = s0;
 520    tokens[1] = s1;
 521    tokens[2] = s2;
 522    tokens[3] = s3;
 523    tokens[4] = s4;
 524
 525    idx = _mesa_add_state_reference( paramList, tokens );
 526
 527    return src_reg(PROGRAM_STATE_VAR, idx);
 528 }
 529
 530
 531 static struct prog_src_register search_or_add_const4f( struct brw_wm_compile *c,
 532                                                      GLfloat s0,
 533                                                      GLfloat s1,
 534                                                      GLfloat s2,
 535                                                      GLfloat s3)
 536 {
 537    struct gl_program_parameter_list *paramList = c->fp->program.Base.Parameters;
 538    gl_constant_value values[4];
 539    GLuint idx;
 540    GLuint swizzle;
 541    struct prog_src_register reg;
 542
 543    values[0].f = s0;
 544    values[1].f = s1;
 545    values[2].f = s2;
 546    values[3].f = s3;
 547
 548    idx = _mesa_add_unnamed_constant( paramList, values, 4, &swizzle );
 549    reg = src_reg(PROGRAM_STATE_VAR, idx);
 550    reg.Swizzle = swizzle;
 551
 552    return reg;
 553 }
 554
 555
 556
 557 /***********************************************************************
 558  * Expand various instructions here to simpler forms.
 559  */
 560 static void precalc_dst( struct brw_wm_compile *c,
 561                                const struct prog_instruction *inst )
 562 {
 563    struct prog_src_register src0 = inst->SrcReg[0];
 564    struct prog_src_register src1 = inst->SrcReg[1];
 565    struct prog_dst_register dst = inst->DstReg;
 566    struct prog_dst_register temp = get_temp(c);
 567
 568    if (dst.WriteMask & WRITEMASK_Y) {
 569       /* dst.y = mul src0.y, src1.y
 570        */
 571       emit_op(c,
 572               OPCODE_MUL,
 573               dst_mask(temp, WRITEMASK_Y),
 574               inst->SaturateMode,
 575               src0,
 576               src1,
 577               src_undef());
 578    }
 579
 580    if (dst.WriteMask & WRITEMASK_XZ) {
 581       struct prog_instruction *swz;
 582       GLuint z = GET_SWZ(src0.Swizzle, Z);
 583
 584       /* dst.xz = swz src0.1zzz
 585        */
 586       swz = emit_op(c,
 587                     OPCODE_SWZ,
 588                     dst_mask(temp, WRITEMASK_XZ),
 589                     inst->SaturateMode,
 590                     src_swizzle(src0, SWIZZLE_ONE, z, z, z),
 591                     src_undef(),
 592                     src_undef());
 593       /* Avoid letting negation flag of src0 affect our 1 constant. */
 594       swz->SrcReg[0].Negate &= ~NEGATE_X;
 595    }
 596    if (dst.WriteMask & WRITEMASK_W) {
 597       /* dst.w = mov src1.w
 598        */
 599       emit_op(c,
 600               OPCODE_MOV,
 601               dst_mask(temp, WRITEMASK_W),
 602               inst->SaturateMode,
 603               src1,
 604               src_undef(),
 605               src_undef());
 606    }
 607
 608    /* This will get optimized out in general, but it ensures that we
 609     * don't overwrite src operands in our channel-wise splitting
 610     * above.  See piglit fp-dst-aliasing-[12].
 611     */
 612    emit_op(c,
 613            OPCODE_MOV,
 614            dst,
 615            0,
 616            src_reg_from_dst(temp),
 617            src_undef(),
 618            src_undef());
 619
 620    release_temp(c, temp);
 621 }
 622
 623
 624 static void precalc_lit( struct brw_wm_compile *c,
 625                          const struct prog_instruction *inst )
 626 {
 627    struct prog_src_register src0 = inst->SrcReg[0];
 628    struct prog_dst_register dst = inst->DstReg;
 629
 630    if (dst.WriteMask & WRITEMASK_YZ) {
 631       emit_op(c,
 632               OPCODE_LIT,
 633               dst_mask(dst, WRITEMASK_YZ),
 634               inst->SaturateMode,
 635               src0,
 636               src_undef(),
 637               src_undef());
 638    }
 639
 640    if (dst.WriteMask & WRITEMASK_XW) {
 641       struct prog_instruction *swz;
 642
 643       /* dst.xw = swz src0.1111
 644        */
 645       swz = emit_op(c,
 646                     OPCODE_SWZ,
 647                     dst_mask(dst, WRITEMASK_XW),
 648                     0,
 649                     src_swizzle1(src0, SWIZZLE_ONE),
 650                     src_undef(),
 651                     src_undef());
 652       /* Avoid letting the negation flag of src0 affect our 1 constant. */
 653       swz->SrcReg[0].Negate = NEGATE_NONE;
 654    }
 655 }
 656
 657
 658 /**
 659  * Some TEX instructions require extra code, cube map coordinate
 660  * normalization, or coordinate scaling for RECT textures, etc.
 661  * This function emits those extra instructions and the TEX
 662  * instruction itself.
 663  */
 664 static void precalc_tex( struct brw_wm_compile *c,
 665                          const struct prog_instruction *inst )
 666 {
 667    struct prog_src_register coord;
 668    struct prog_dst_register tmpcoord = { 0 };
 669    const GLuint unit = c->fp->program.Base.SamplerUnits[inst->TexSrcUnit];
 670
 671    assert(unit < BRW_MAX_TEX_UNIT);
 672
 673    if (inst->TexSrcTarget == TEXTURE_CUBE_INDEX) {
 674        struct prog_instruction *out;
 675        struct prog_dst_register tmp0 = get_temp(c);
 676        struct prog_src_register tmp0src = src_reg_from_dst(tmp0);
 677        struct prog_dst_register tmp1 = get_temp(c);
 678        struct prog_src_register tmp1src = src_reg_from_dst(tmp1);
 679        struct prog_src_register src0 = inst->SrcReg[0];
 680
 681        /* find longest component of coord vector and normalize it */
 682        tmpcoord = get_temp(c);
 683        coord = src_reg_from_dst(tmpcoord);
 684
 685        /* tmpcoord = src0 (i.e.: coord = src0) */
 686        out = emit_op(c, OPCODE_MOV,
 687                      tmpcoord,
 688                      0,
 689                      src0,
 690                      src_undef(),
 691                      src_undef());
 692        out->SrcReg[0].Negate = NEGATE_NONE;
 693        out->SrcReg[0].Abs = 1;
 694
 695        /* tmp0 = MAX(coord.X, coord.Y) */
 696        emit_op(c, OPCODE_MAX,
 697                tmp0,
 698                0,
 699                src_swizzle1(coord, X),
 700                src_swizzle1(coord, Y),
 701                src_undef());
 702
 703        /* tmp1 = MAX(tmp0, coord.Z) */
 704        emit_op(c, OPCODE_MAX,
 705                tmp1,
 706                0,
 707                tmp0src,
 708                src_swizzle1(coord, Z),
 709                src_undef());
 710
 711        /* tmp0 = 1 / tmp1 */
 712        emit_op(c, OPCODE_RCP,
 713                dst_mask(tmp0, WRITEMASK_X),
 714                0,
 715                tmp1src,
 716                src_undef(),
 717                src_undef());
 718
 719        /* tmpCoord = src0 * tmp0 */
 720        emit_op(c, OPCODE_MUL,
 721                tmpcoord,
 722                0,
 723                src0,
 724                src_swizzle1(tmp0src, SWIZZLE_X),
 725                src_undef());
 726
 727        release_temp(c, tmp0);
 728        release_temp(c, tmp1);
 729    }
 730    else if (inst->TexSrcTarget == TEXTURE_RECT_INDEX) {
 731       struct prog_src_register scale =
 732          search_or_add_param5( c,
 733                                STATE_INTERNAL,
 734                                STATE_TEXRECT_SCALE,
 735                                unit,
 736                                0,0 );
 737
 738       tmpcoord = get_temp(c);
 739
 740       /* coord.xy   = MUL inst->SrcReg[0], { 1/width, 1/height }
 741        */
 742       emit_op(c,
 743               OPCODE_MUL,
 744               tmpcoord,
 745               0,
 746               inst->SrcReg[0],
 747               src_swizzle(scale,
 748                           SWIZZLE_X,
 749                           SWIZZLE_Y,
 750                           SWIZZLE_ONE,
 751                           SWIZZLE_ONE),
 752               src_undef());
 753
 754       coord = src_reg_from_dst(tmpcoord);
 755    }
 756    else {
 757       coord = inst->SrcReg[0];
 758    }
 759
 760    /* Need to emit YUV texture conversions by hand.  Probably need to
 761     * do this here - the alternative is in brw_wm_emit.c, but the
 762     * conversion requires allocating a temporary variable which we
 763     * don't have the facility to do that late in the compilation.
 764     */
 765    if (c->key.yuvtex_mask & (1 << unit)) {
 766       /* convert ycbcr to RGBA */
 767       GLboolean  swap_uv = c->key.yuvtex_swap_mask & (1<<unit);
 768
 769       /*
 770          CONST C0 = { -.5, -.0625,  -.5, 1.164 }
 771          CONST C1 = { 1.596, -0.813, 2.018, -.391 }
 772          UYV     = TEX ...
 773          UYV.xyz = ADD UYV,     C0
 774          UYV.y   = MUL UYV.y,   C0.w
 775          if (UV swaped)
 776             RGB.xyz = MAD UYV.zzx, C1,   UYV.y
 777          else
 778             RGB.xyz = MAD UYV.xxz, C1,   UYV.y
 779          RGB.y   = MAD UYV.z,   C1.w, RGB.y
 780       */
 781       struct prog_dst_register dst = inst->DstReg;
 782       struct prog_dst_register tmp = get_temp(c);
 783       struct prog_src_register tmpsrc = src_reg_from_dst(tmp);
 784       struct prog_src_register C0 = search_or_add_const4f( c,  -.5, -.0625, -.5, 1.164 );
 785       struct prog_src_register C1 = search_or_add_const4f( c, 1.596, -0.813, 2.018, -.391 );
 786
 787       /* tmp     = TEX ...
 788        */
 789       emit_tex_op(c,
 790                   OPCODE_TEX,
 791                   tmp,
 792                   inst->SaturateMode,
 793                   unit,
 794                   inst->TexSrcTarget,
 795                   inst->TexShadow,
 796                   coord,
 797                   src_undef(),
 798                   src_undef());
 799
 800       /* tmp.xyz =  ADD TMP, C0
 801        */
 802       emit_op(c,
 803               OPCODE_ADD,
 804               dst_mask(tmp, WRITEMASK_XYZ),
 805               0,
 806               tmpsrc,
 807               C0,
 808               src_undef());
 809
 810       /* YUV.y   = MUL YUV.y, C0.w
 811        */
 812
 813       emit_op(c,
 814               OPCODE_MUL,
 815               dst_mask(tmp, WRITEMASK_Y),
 816               0,
 817               tmpsrc,
 818               src_swizzle1(C0, W),
 819               src_undef());
 820
 821       /*
 822        * if (UV swaped)
 823        *     RGB.xyz = MAD YUV.zzx, C1, YUV.y
 824        * else
 825        *     RGB.xyz = MAD YUV.xxz, C1, YUV.y
 826        */
 827
 828       emit_op(c,
 829               OPCODE_MAD,
 830               dst_mask(dst, WRITEMASK_XYZ),
 831               0,
 832               swap_uv?src_swizzle(tmpsrc, Z,Z,X,X):src_swizzle(tmpsrc, X,X,Z,Z),
 833               C1,
 834               src_swizzle1(tmpsrc, Y));
 835
 836       /*  RGB.y   = MAD YUV.z, C1.w, RGB.y
 837        */
 838       emit_op(c,
 839               OPCODE_MAD,
 840               dst_mask(dst, WRITEMASK_Y),
 841               0,
 842               src_swizzle1(tmpsrc, Z),
 843               src_swizzle1(C1, W),
 844               src_swizzle1(src_reg_from_dst(dst), Y));
 845
 846       release_temp(c, tmp);
 847    }
 848    else {
 849       /* ordinary RGBA tex instruction */
 850       emit_tex_op(c,
 851                   OPCODE_TEX,
 852                   inst->DstReg,
 853                   inst->SaturateMode,
 854                   unit,
 855                   inst->TexSrcTarget,
 856                   inst->TexShadow,
 857                   coord,
 858                   src_undef(),
 859                   src_undef());
 860    }
 861
 862    /* For GL_EXT_texture_swizzle: */
 863    if (c->key.tex_swizzles[unit] != SWIZZLE_NOOP) {
 864       /* swizzle the result of the TEX instruction */
 865       struct prog_src_register tmpsrc = src_reg_from_dst(inst->DstReg);
 866       emit_op(c, OPCODE_SWZ,
 867               inst->DstReg,
 868               SATURATE_OFF, /* saturate already done above */
 869               src_swizzle4(tmpsrc, c->key.tex_swizzles[unit]),
 870               src_undef(),
 871               src_undef());
 872    }
 873
 874    if ((inst->TexSrcTarget == TEXTURE_RECT_INDEX) ||
 875        (inst->TexSrcTarget == TEXTURE_CUBE_INDEX))
 876       release_temp(c, tmpcoord);
 877 }
 878
 879
 880 /**
 881  * Check if the given TXP instruction really needs the divide-by-W step.
 882  */
 883 static GLboolean projtex( struct brw_wm_compile *c,
 884                           const struct prog_instruction *inst )
 885 {
 886    const struct prog_src_register src = inst->SrcReg[0];
 887    GLboolean retVal;
 888
 889    assert(inst->Opcode == OPCODE_TXP);
 890
 891    /* Only try to detect the simplest cases.  Could detect (later)
 892     * cases where we are trying to emit code like RCP {1.0}, MUL x,
 893     * {1.0}, and so on.
 894     *
 895     * More complex cases than this typically only arise from
 896     * user-provided fragment programs anyway:
 897     */
 898    if (inst->TexSrcTarget == TEXTURE_CUBE_INDEX)
 899       retVal = GL_FALSE;  /* ut2004 gun rendering !?! */
 900    else if (src.File == PROGRAM_INPUT &&
 901             GET_SWZ(src.Swizzle, W) == W &&
 902             (c->key.proj_attrib_mask & (1 << src.Index)) == 0)
 903       retVal = GL_FALSE;
 904    else
 905       retVal = GL_TRUE;
 906
 907    return retVal;
 908 }
 909
 910
 911 /**
 912  * Emit code for TXP.
 913  */
 914 static void precalc_txp( struct brw_wm_compile *c,
 915                                const struct prog_instruction *inst )
 916 {
 917    struct prog_src_register src0 = inst->SrcReg[0];
 918
 919    if (projtex(c, inst)) {
 920       struct prog_dst_register tmp = get_temp(c);
 921       struct prog_instruction tmp_inst;
 922
 923       /* tmp0.w = RCP inst.arg[0][3]
 924        */
 925       emit_op(c,
 926               OPCODE_RCP,
 927               dst_mask(tmp, WRITEMASK_W),
 928               0,
 929               src_swizzle1(src0, GET_SWZ(src0.Swizzle, W)),
 930               src_undef(),
 931               src_undef());
 932
 933       /* tmp0.xyz =  MUL inst.arg[0], tmp0.wwww
 934        */
 935       emit_op(c,
 936               OPCODE_MUL,
 937               dst_mask(tmp, WRITEMASK_XYZ),
 938               0,
 939               src0,
 940               src_swizzle1(src_reg_from_dst(tmp), W),
 941               src_undef());
 942
 943       /* dst = precalc(TEX tmp0)
 944        */
 945       tmp_inst = *inst;
 946       tmp_inst.SrcReg[0] = src_reg_from_dst(tmp);
 947       precalc_tex(c, &tmp_inst);
 948
 949       release_temp(c, tmp);
 950    }
 951    else
 952    {
 953       /* dst = precalc(TEX src0)
 954        */
 955       precalc_tex(c, inst);
 956    }
 957 }
 958
 959
 960
 961 static void emit_render_target_writes( struct brw_wm_compile *c )
 962 {
 963    struct prog_src_register payload_r0_depth = src_reg(PROGRAM_PAYLOAD, PAYLOAD_DEPTH);
 964    struct prog_src_register outdepth = src_reg(PROGRAM_OUTPUT, FRAG_RESULT_DEPTH);
 965    struct prog_src_register outcolor;
 966    GLuint i;
 967
 968    struct prog_instruction *inst = NULL;
 969
 970    /* The inst->Aux field is used for FB write target and the EOT marker */
 971
 972    for (i = 0; i < c->key.nr_color_regions; i++) {
 973       if (c->fp->program.Base.OutputsWritten & (1 << FRAG_RESULT_COLOR)) {
 974          outcolor = src_reg(PROGRAM_OUTPUT, FRAG_RESULT_COLOR);
 975       } else {
 976          outcolor = src_reg(PROGRAM_OUTPUT, FRAG_RESULT_DATA0 + i);
 977       }
 978       inst = emit_op(c, WM_FB_WRITE, dst_mask(dst_undef(), 0),
 979                      0, outcolor, payload_r0_depth, outdepth);
 980       inst->Aux = INST_AUX_TARGET(i);
 981    }
 982
 983    /* Mark the last FB write as final, or emit a dummy write if we had
 984     * no render targets bound.
 985     */
 986    if (c->key.nr_color_regions != 0) {
 987       inst->Aux |= INST_AUX_EOT;
 988    } else {
 989       inst = emit_op(c, WM_FB_WRITE, dst_mask(dst_undef(), 0),
 990                      0, src_reg(PROGRAM_OUTPUT, FRAG_RESULT_COLOR),
 991                      payload_r0_depth, outdepth);
 992       inst->Aux = INST_AUX_TARGET(0) | INST_AUX_EOT;
 993    }
 994 }
 995
 996
 997
 998
 999 /***********************************************************************
1000  * Emit INTERP instructions ahead of first use of each attrib.
1001  */
1002
1003 static void validate_src_regs( struct brw_wm_compile *c,
1004                                const struct prog_instruction *inst )
1005 {
1006    GLuint nr_args = brw_wm_nr_args( inst->Opcode );
1007    GLuint i;
1008
1009    for (i = 0; i < nr_args; i++) {
1010       if (inst->SrcReg[i].File == PROGRAM_INPUT) {
1011          GLuint idx = inst->SrcReg[i].Index;
1012          if (!(c->fp_interp_emitted & (1<<idx))) {
1013             emit_interp(c, idx);
1014          }
1015       }
1016    }
1017 }
1018
1019 static void print_insns( const struct prog_instruction *insn,
1020                          GLuint nr )
1021 {
1022    GLuint i;
1023    for (i = 0; i < nr; i++, insn++) {
1024       printf("%3d: ", i);
1025       if (insn->Opcode < MAX_OPCODE)
1026          _mesa_fprint_instruction_opt(stdout, insn, 0, PROG_PRINT_DEBUG, NULL);
1027       else if (insn->Opcode < MAX_WM_OPCODE) {
1028          GLuint idx = insn->Opcode - MAX_OPCODE;
1029
1030          _mesa_fprint_alu_instruction(stdout, insn, wm_opcode_strings[idx],
1031                                       3, PROG_PRINT_DEBUG, NULL);
1032       }
1033       else
1034          printf("965 Opcode %d\n", insn->Opcode);
1035    }
1036 }
1037
1038
1039 /**
1040  * Initial pass for fragment program code generation.
1041  * This function is used by both the GLSL and non-GLSL paths.
1042  */
1043 void brw_wm_pass_fp( struct brw_wm_compile *c )
1044 {
1045    struct intel_context *intel = &c->func.brw->intel;
1046    struct brw_fragment_program *fp = c->fp;
1047    GLuint insn;
1048
1049    if (unlikely(INTEL_DEBUG & DEBUG_WM)) {
1050       printf("pre-fp:\n");
1051       _mesa_fprint_program_opt(stdout, &fp->program.Base, PROG_PRINT_DEBUG,
1052                                GL_TRUE);
1053       printf("\n");
1054    }
1055
1056    c->pixel_xy = src_undef();
1057    if (intel->gen >= 6) {
1058       /* The interpolation deltas come in as the perspective pixel
1059        * location barycentric params.
1060        */
1061       c->delta_xy = src_reg(PROGRAM_PAYLOAD, PAYLOAD_DEPTH);
1062    } else {
1063       c->delta_xy = src_undef();
1064    }
1065    c->pixel_w = src_undef();
1066    c->nr_fp_insns = 0;
1067    c->fp->tex_units_used = 0x0;
1068
1069    /* Emit preamble instructions.  This is where special instructions such as
1070     * WM_CINTERP, WM_LINTERP, WM_PINTERP and WM_WPOSXY are emitted to
1071     * compute shader inputs from varying vars.
1072     */
1073    for (insn = 0; insn < fp->program.Base.NumInstructions; insn++) {
1074       const struct prog_instruction *inst = &fp->program.Base.Instructions[insn];
1075       validate_src_regs(c, inst);
1076    }
1077
1078    /* Loop over all instructions doing assorted simplifications and
1079     * transformations.
1080     */
1081    for (insn = 0; insn < fp->program.Base.NumInstructions; insn++) {
1082       const struct prog_instruction *inst = &fp->program.Base.Instructions[insn];
1083       struct prog_instruction *out;
1084
1085       /* Check for INPUT values, emit INTERP instructions where
1086        * necessary:
1087        */
1088
1089       switch (inst->Opcode) {
1090       case OPCODE_SWZ:
1091          out = emit_insn(c, inst);
1092          out->Opcode = OPCODE_MOV;
1093          break;
1094
1095       case OPCODE_ABS:
1096          out = emit_insn(c, inst);
1097          out->Opcode = OPCODE_MOV;
1098          out->SrcReg[0].Negate = NEGATE_NONE;
1099          out->SrcReg[0].Abs = 1;
1100          break;
1101
1102       case OPCODE_SUB:
1103          out = emit_insn(c, inst);
1104          out->Opcode = OPCODE_ADD;
1105          out->SrcReg[1].Negate ^= NEGATE_XYZW;
1106          break;
1107
1108       case OPCODE_SCS:
1109          out = emit_insn(c, inst);
1110          /* This should probably be done in the parser.
1111           */
1112          out->DstReg.WriteMask &= WRITEMASK_XY;
1113          break;
1114
1115       case OPCODE_DST:
1116          precalc_dst(c, inst);
1117          break;
1118
1119       case OPCODE_LIT:
1120          precalc_lit(c, inst);
1121          break;
1122
1123       case OPCODE_RSQ:
1124          out = emit_scalar_insn(c, inst);
1125          out->SrcReg[0].Abs = GL_TRUE;
1126          break;
1127
1128       case OPCODE_TEX:
1129          precalc_tex(c, inst);
1130          break;
1131
1132       case OPCODE_TXP:
1133          precalc_txp(c, inst);
1134          break;
1135
1136       case OPCODE_TXB:
1137          out = emit_insn(c, inst);
1138          out->TexSrcUnit = fp->program.Base.SamplerUnits[inst->TexSrcUnit];
1139          assert(out->TexSrcUnit < BRW_MAX_TEX_UNIT);
1140          break;
1141
1142       case OPCODE_XPD:
1143          out = emit_insn(c, inst);
1144          /* This should probably be done in the parser.
1145           */
1146          out->DstReg.WriteMask &= WRITEMASK_XYZ;
1147          break;
1148
1149       case OPCODE_KIL:
1150          out = emit_insn(c, inst);
1151          /* This should probably be done in the parser.
1152           */
1153          out->DstReg.WriteMask = 0;
1154          break;
1155       case OPCODE_END:
1156          emit_render_target_writes(c);
1157          break;
1158       case OPCODE_PRINT:
1159          break;
1160       default:
1161          if (brw_wm_is_scalar_result(inst->Opcode))
1162             emit_scalar_insn(c, inst);
1163          else
1164             emit_insn(c, inst);
1165          break;
1166       }
1167    }
1168
1169    if (unlikely(INTEL_DEBUG & DEBUG_WM)) {
1170       printf("pass_fp:\n");
1171       print_insns( c->prog_instructions, c->nr_fp_insns );
1172       printf("\n");
1173    }
1174 }
1175