src/mesa/drivers/dri/i915/i915_program.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2003 VMware, Inc.
   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 VMWARE 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 #include <strings.h>
  29
  30 #include "main/glheader.h"
  31 #include "main/macros.h"
  32 #include "main/enums.h"
  33
  34 #include "tnl/t_context.h"
  35 #include "intel_batchbuffer.h"
  36
  37 #include "i915_reg.h"
  38 #include "i915_context.h"
  39 #include "i915_program.h"
  40
  41
  42 #define A0_DEST( reg ) (((reg)&UREG_TYPE_NR_MASK)>>UREG_A0_DEST_SHIFT_LEFT)
  43 #define D0_DEST( reg ) (((reg)&UREG_TYPE_NR_MASK)>>UREG_A0_DEST_SHIFT_LEFT)
  44 #define T0_DEST( reg ) (((reg)&UREG_TYPE_NR_MASK)>>UREG_A0_DEST_SHIFT_LEFT)
  45 #define A0_SRC0( reg ) (((reg)&UREG_MASK)>>UREG_A0_SRC0_SHIFT_LEFT)
  46 #define A1_SRC0( reg ) (((reg)&UREG_MASK)<<UREG_A1_SRC0_SHIFT_RIGHT)
  47 #define A1_SRC1( reg ) (((reg)&UREG_MASK)>>UREG_A1_SRC1_SHIFT_LEFT)
  48 #define A2_SRC1( reg ) (((reg)&UREG_MASK)<<UREG_A2_SRC1_SHIFT_RIGHT)
  49 #define A2_SRC2( reg ) (((reg)&UREG_MASK)>>UREG_A2_SRC2_SHIFT_LEFT)
  50
  51 /* These are special, and don't have swizzle/negate bits.
  52  */
  53 #define T0_SAMPLER( reg )     (GET_UREG_NR(reg)<<T0_SAMPLER_NR_SHIFT)
  54 #define T1_ADDRESS_REG( reg ) ((GET_UREG_NR(reg)<<T1_ADDRESS_REG_NR_SHIFT) | \
  55                                (GET_UREG_TYPE(reg)<<T1_ADDRESS_REG_TYPE_SHIFT))
  56
  57
  58 /* Macros for translating UREG's into the various register fields used
  59  * by the I915 programmable unit.
  60  */
  61 #define UREG_A0_DEST_SHIFT_LEFT  (UREG_TYPE_SHIFT - A0_DEST_TYPE_SHIFT)
  62 #define UREG_A0_SRC0_SHIFT_LEFT  (UREG_TYPE_SHIFT - A0_SRC0_TYPE_SHIFT)
  63 #define UREG_A1_SRC0_SHIFT_RIGHT (A1_SRC0_CHANNEL_W_SHIFT - UREG_CHANNEL_W_SHIFT)
  64 #define UREG_A1_SRC1_SHIFT_LEFT  (UREG_TYPE_SHIFT - A1_SRC1_TYPE_SHIFT)
  65 #define UREG_A2_SRC1_SHIFT_RIGHT (A2_SRC1_CHANNEL_W_SHIFT - UREG_CHANNEL_W_SHIFT)
  66 #define UREG_A2_SRC2_SHIFT_LEFT  (UREG_TYPE_SHIFT - A2_SRC2_TYPE_SHIFT)
  67
  68 #define UREG_MASK         0xffffff00
  69 #define UREG_TYPE_NR_MASK ((REG_TYPE_MASK << UREG_TYPE_SHIFT) | \
  70                            (REG_NR_MASK << UREG_NR_SHIFT))
  71
  72
  73 #define I915_CONSTFLAG_PARAM 0x1f
  74
  75 GLuint
  76 i915_get_temp(struct i915_fragment_program *p)
  77 {
  78    int bit = ffs(~p->temp_flag);
  79    if (!bit) {
  80       fprintf(stderr, "%s: out of temporaries\n", __FILE__);
  81       exit(1);
  82    }
  83
  84    p->temp_flag |= 1 << (bit - 1);
  85    return UREG(REG_TYPE_R, (bit - 1));
  86 }
  87
  88
  89 GLuint
  90 i915_get_utemp(struct i915_fragment_program * p)
  91 {
  92    int bit = ffs(~p->utemp_flag);
  93    if (!bit) {
  94       fprintf(stderr, "%s: out of temporaries\n", __FILE__);
  95       exit(1);
  96    }
  97
  98    p->utemp_flag |= 1 << (bit - 1);
  99    return UREG(REG_TYPE_U, (bit - 1));
 100 }
 101
 102 void
 103 i915_release_utemps(struct i915_fragment_program *p)
 104 {
 105    p->utemp_flag = ~0x7;
 106 }
 107
 108
 109 GLuint
 110 i915_emit_decl(struct i915_fragment_program *p,
 111                GLuint type, GLuint nr, GLuint d0_flags)
 112 {
 113    GLuint reg = UREG(type, nr);
 114
 115    if (type == REG_TYPE_T) {
 116       if (p->decl_t & (1 << nr))
 117          return reg;
 118
 119       p->decl_t |= (1 << nr);
 120    }
 121    else if (type == REG_TYPE_S) {
 122       if (p->decl_s & (1 << nr))
 123          return reg;
 124
 125       p->decl_s |= (1 << nr);
 126    }
 127    else
 128       return reg;
 129
 130    *(p->decl++) = (D0_DCL | D0_DEST(reg) | d0_flags);
 131    *(p->decl++) = D1_MBZ;
 132    *(p->decl++) = D2_MBZ;
 133    assert(p->decl <= p->declarations + ARRAY_SIZE(p->declarations));
 134
 135    p->nr_decl_insn++;
 136    return reg;
 137 }
 138
 139 GLuint
 140 i915_emit_arith(struct i915_fragment_program * p,
 141                 GLuint op,
 142                 GLuint dest,
 143                 GLuint mask,
 144                 GLuint saturate, GLuint src0, GLuint src1, GLuint src2)
 145 {
 146    GLuint c[3];
 147    GLuint nr_const = 0;
 148
 149    assert(GET_UREG_TYPE(dest) != REG_TYPE_CONST);
 150    dest = UREG(GET_UREG_TYPE(dest), GET_UREG_NR(dest));
 151    assert(dest);
 152
 153    if (GET_UREG_TYPE(src0) == REG_TYPE_CONST)
 154       c[nr_const++] = 0;
 155    if (GET_UREG_TYPE(src1) == REG_TYPE_CONST)
 156       c[nr_const++] = 1;
 157    if (GET_UREG_TYPE(src2) == REG_TYPE_CONST)
 158       c[nr_const++] = 2;
 159
 160    /* Recursively call this function to MOV additional const values
 161     * into temporary registers.  Use utemp registers for this -
 162     * currently shouldn't be possible to run out, but keep an eye on
 163     * this.
 164     */
 165    if (nr_const > 1) {
 166       GLuint s[3], first, i, old_utemp_flag;
 167
 168       s[0] = src0;
 169       s[1] = src1;
 170       s[2] = src2;
 171       old_utemp_flag = p->utemp_flag;
 172
 173       first = GET_UREG_NR(s[c[0]]);
 174       for (i = 1; i < nr_const; i++) {
 175          if (GET_UREG_NR(s[c[i]]) != first) {
 176             GLuint tmp = i915_get_utemp(p);
 177
 178             i915_emit_arith(p, A0_MOV, tmp, A0_DEST_CHANNEL_ALL, 0,
 179                             s[c[i]], 0, 0);
 180             s[c[i]] = tmp;
 181          }
 182       }
 183
 184       src0 = s[0];
 185       src1 = s[1];
 186       src2 = s[2];
 187       p->utemp_flag = old_utemp_flag;   /* restore */
 188    }
 189
 190    if (p->csr >= p->program + ARRAY_SIZE(p->program)) {
 191       i915_program_error(p, "Program contains too many instructions");
 192       return UREG_BAD;
 193    }
 194
 195    *(p->csr++) = (op | A0_DEST(dest) | mask | saturate | A0_SRC0(src0));
 196    *(p->csr++) = (A1_SRC0(src0) | A1_SRC1(src1));
 197    *(p->csr++) = (A2_SRC1(src1) | A2_SRC2(src2));
 198
 199    if (GET_UREG_TYPE(dest) == REG_TYPE_R)
 200       p->register_phases[GET_UREG_NR(dest)] = p->nr_tex_indirect;
 201
 202    p->nr_alu_insn++;
 203    return dest;
 204 }
 205
 206 static GLuint get_free_rreg (struct i915_fragment_program *p,
 207                              GLuint live_regs)
 208 {
 209     int bit = ffs(~live_regs);
 210     if (!bit) {
 211         i915_program_error(p, "Can't find free R reg");
 212         return UREG_BAD;
 213     }
 214     return UREG(REG_TYPE_R, bit - 1);
 215 }
 216
 217 GLuint i915_emit_texld( struct i915_fragment_program *p,
 218                         GLuint live_regs,
 219                         GLuint dest,
 220                         GLuint destmask,
 221                         GLuint sampler,
 222                         GLuint coord,
 223                         GLuint op )
 224 {
 225     if (coord != UREG(GET_UREG_TYPE(coord), GET_UREG_NR(coord))) {
 226         /* With the help of the "needed registers" table created earlier, pick
 227          * a register we can MOV the swizzled TC to (since TEX doesn't support
 228          * swizzled sources) */
 229         GLuint swizCoord = get_free_rreg(p, live_regs);
 230         if (swizCoord == UREG_BAD)
 231             return 0;
 232
 233         i915_emit_arith( p, A0_MOV, swizCoord, A0_DEST_CHANNEL_ALL, 0, coord, 0, 0 );
 234         coord = swizCoord;
 235     }
 236
 237    /* Don't worry about saturate as we only support texture formats
 238     * that are always in the 0..1 range.
 239     */
 240    if (destmask != A0_DEST_CHANNEL_ALL) {
 241       GLuint tmp = i915_get_utemp(p);
 242       i915_emit_texld( p, 0, tmp, A0_DEST_CHANNEL_ALL, sampler, coord, op );
 243       i915_emit_arith( p, A0_MOV, dest, destmask, 0, tmp, 0, 0 );
 244       return dest;
 245    }
 246    else {
 247       assert(GET_UREG_TYPE(dest) != REG_TYPE_CONST);
 248       assert(dest == UREG(GET_UREG_TYPE(dest), GET_UREG_NR(dest)));
 249       /* Can't use unsaved temps for coords, as the phase boundary would result
 250        * in the contents becoming undefined.
 251        */
 252       assert(GET_UREG_TYPE(coord) != REG_TYPE_U);
 253
 254       if ((GET_UREG_TYPE(coord) != REG_TYPE_R) &&
 255           (GET_UREG_TYPE(coord) != REG_TYPE_OC) &&
 256           (GET_UREG_TYPE(coord) != REG_TYPE_OD) &&
 257           (GET_UREG_TYPE(coord) != REG_TYPE_T)) {
 258           GLuint  tmpCoord = get_free_rreg(p, live_regs);
 259
 260           if (tmpCoord == UREG_BAD)
 261               return 0;
 262
 263           i915_emit_arith(p, A0_MOV, tmpCoord, A0_DEST_CHANNEL_ALL, 0, coord, 0, 0);
 264           coord = tmpCoord;
 265       }
 266
 267       /* Output register being oC or oD defines a phase boundary */
 268       if (GET_UREG_TYPE(dest) == REG_TYPE_OC ||
 269           GET_UREG_TYPE(dest) == REG_TYPE_OD)
 270          p->nr_tex_indirect++;
 271
 272       /* Reading from an r# register whose contents depend on output of the
 273        * current phase defines a phase boundary.
 274        */
 275       if (GET_UREG_TYPE(coord) == REG_TYPE_R &&
 276           p->register_phases[GET_UREG_NR(coord)] == p->nr_tex_indirect)
 277          p->nr_tex_indirect++;
 278
 279       if (p->csr >= p->program + ARRAY_SIZE(p->program)) {
 280          i915_program_error(p, "Program contains too many instructions");
 281          return UREG_BAD;
 282       }
 283
 284       *(p->csr++) = (op |
 285                      T0_DEST( dest ) |
 286                      T0_SAMPLER( sampler ));
 287
 288       *(p->csr++) = T1_ADDRESS_REG( coord );
 289       *(p->csr++) = T2_MBZ;
 290
 291       if (GET_UREG_TYPE(dest) == REG_TYPE_R)
 292          p->register_phases[GET_UREG_NR(dest)] = p->nr_tex_indirect;
 293
 294       p->nr_tex_insn++;
 295       return dest;
 296    }
 297 }
 298
 299
 300 GLuint
 301 i915_emit_const1f(struct i915_fragment_program * p, GLfloat c0)
 302 {
 303    GLint reg, idx;
 304
 305    if (c0 == 0.0)
 306       return swizzle(UREG(REG_TYPE_R, 0), ZERO, ZERO, ZERO, ZERO);
 307    if (c0 == 1.0)
 308       return swizzle(UREG(REG_TYPE_R, 0), ONE, ONE, ONE, ONE);
 309
 310    for (reg = 0; reg < I915_MAX_CONSTANT; reg++) {
 311       if (p->constant_flags[reg] == I915_CONSTFLAG_PARAM)
 312          continue;
 313       for (idx = 0; idx < 4; idx++) {
 314          if (!(p->constant_flags[reg] & (1 << idx)) ||
 315              p->constant[reg][idx] == c0) {
 316             p->constant[reg][idx] = c0;
 317             p->constant_flags[reg] |= 1 << idx;
 318             if (reg + 1 > p->nr_constants)
 319                p->nr_constants = reg + 1;
 320             return swizzle(UREG(REG_TYPE_CONST, reg), idx, ZERO, ZERO, ONE);
 321          }
 322       }
 323    }
 324
 325    fprintf(stderr, "%s: out of constants\n", __FUNCTION__);
 326    p->error = 1;
 327    return 0;
 328 }
 329
 330 GLuint
 331 i915_emit_const2f(struct i915_fragment_program * p, GLfloat c0, GLfloat c1)
 332 {
 333    GLint reg, idx;
 334
 335    if (c0 == 0.0)
 336       return swizzle(i915_emit_const1f(p, c1), ZERO, X, Z, W);
 337    if (c0 == 1.0)
 338       return swizzle(i915_emit_const1f(p, c1), ONE, X, Z, W);
 339
 340    if (c1 == 0.0)
 341       return swizzle(i915_emit_const1f(p, c0), X, ZERO, Z, W);
 342    if (c1 == 1.0)
 343       return swizzle(i915_emit_const1f(p, c0), X, ONE, Z, W);
 344
 345    for (reg = 0; reg < I915_MAX_CONSTANT; reg++) {
 346       if (p->constant_flags[reg] == 0xf ||
 347           p->constant_flags[reg] == I915_CONSTFLAG_PARAM)
 348          continue;
 349       for (idx = 0; idx < 3; idx++) {
 350          if (!(p->constant_flags[reg] & (3 << idx))) {
 351             p->constant[reg][idx] = c0;
 352             p->constant[reg][idx + 1] = c1;
 353             p->constant_flags[reg] |= 3 << idx;
 354             if (reg + 1 > p->nr_constants)
 355                p->nr_constants = reg + 1;
 356             return swizzle(UREG(REG_TYPE_CONST, reg), idx, idx + 1, ZERO,
 357                            ONE);
 358          }
 359       }
 360    }
 361
 362    fprintf(stderr, "%s: out of constants\n", __FUNCTION__);
 363    p->error = 1;
 364    return 0;
 365 }
 366
 367
 368
 369 GLuint
 370 i915_emit_const4f(struct i915_fragment_program * p,
 371                   GLfloat c0, GLfloat c1, GLfloat c2, GLfloat c3)
 372 {
 373    GLint reg;
 374
 375    for (reg = 0; reg < I915_MAX_CONSTANT; reg++) {
 376       if (p->constant_flags[reg] == 0xf &&
 377           p->constant[reg][0] == c0 &&
 378           p->constant[reg][1] == c1 &&
 379           p->constant[reg][2] == c2 && p->constant[reg][3] == c3) {
 380          return UREG(REG_TYPE_CONST, reg);
 381       }
 382       else if (p->constant_flags[reg] == 0) {
 383          p->constant[reg][0] = c0;
 384          p->constant[reg][1] = c1;
 385          p->constant[reg][2] = c2;
 386          p->constant[reg][3] = c3;
 387          p->constant_flags[reg] = 0xf;
 388          if (reg + 1 > p->nr_constants)
 389             p->nr_constants = reg + 1;
 390          return UREG(REG_TYPE_CONST, reg);
 391       }
 392    }
 393
 394    fprintf(stderr, "%s: out of constants\n", __FUNCTION__);
 395    p->error = 1;
 396    return 0;
 397 }
 398
 399
 400 GLuint
 401 i915_emit_const4fv(struct i915_fragment_program * p, const GLfloat * c)
 402 {
 403    return i915_emit_const4f(p, c[0], c[1], c[2], c[3]);
 404 }
 405
 406
 407 GLuint
 408 i915_emit_param4fv(struct i915_fragment_program * p, const GLfloat * values)
 409 {
 410    GLint reg, i;
 411
 412    for (i = 0; i < p->nr_params; i++) {
 413       if (p->param[i].values == values)
 414          return UREG(REG_TYPE_CONST, p->param[i].reg);
 415    }
 416
 417
 418    for (reg = 0; reg < I915_MAX_CONSTANT; reg++) {
 419       if (p->constant_flags[reg] == 0) {
 420          p->constant_flags[reg] = I915_CONSTFLAG_PARAM;
 421          i = p->nr_params++;
 422
 423          p->param[i].values = values;
 424          p->param[i].reg = reg;
 425          p->params_uptodate = 0;
 426
 427          if (reg + 1 > p->nr_constants)
 428             p->nr_constants = reg + 1;
 429          return UREG(REG_TYPE_CONST, reg);
 430       }
 431    }
 432
 433    fprintf(stderr, "%s: out of constants\n", __FUNCTION__);
 434    p->error = 1;
 435    return 0;
 436 }
 437
 438 /* Warning the user about program errors seems to be quite valuable, from
 439  * our bug reports.  It unfortunately means piglit reporting errors
 440  * when we fall back to software due to an unsupportable program, though.
 441  */
 442 void
 443 i915_program_error(struct i915_fragment_program *p, const char *fmt, ...)
 444 {
 445    if (unlikely((INTEL_DEBUG & (DEBUG_WM | DEBUG_PERF)) != 0)) {
 446       va_list args;
 447
 448       fprintf(stderr, "i915_program_error: ");
 449       va_start(args, fmt);
 450       vfprintf(stderr, fmt, args);
 451       va_end(args);
 452
 453       fprintf(stderr, "\n");
 454    }
 455    p->error = 1;
 456 }
 457
 458
 459 void
 460 i915_init_program(struct i915_context *i915, struct i915_fragment_program *p)
 461 {
 462    struct gl_context *ctx = &i915->intel.ctx;
 463
 464    p->translated = 0;
 465    p->params_uptodate = 0;
 466    p->on_hardware = 0;
 467    p->error = 0;
 468
 469    memset(&p->register_phases, 0, sizeof(p->register_phases));
 470    p->nr_tex_indirect = 1;
 471    p->nr_tex_insn = 0;
 472    p->nr_alu_insn = 0;
 473    p->nr_decl_insn = 0;
 474
 475    p->ctx = ctx;
 476    memset(p->constant_flags, 0, sizeof(p->constant_flags));
 477
 478    p->nr_constants = 0;
 479    p->csr = p->program;
 480    p->decl = p->declarations;
 481    p->decl_s = 0;
 482    p->decl_t = 0;
 483    p->temp_flag = 0xffff000;
 484    p->utemp_flag = ~0x7;
 485    p->wpos_tex = -1;
 486    p->depth_written = 0;
 487    p->nr_params = 0;
 488
 489    *(p->decl++) = _3DSTATE_PIXEL_SHADER_PROGRAM;
 490 }
 491
 492
 493 void
 494 i915_fini_program(struct i915_fragment_program *p)
 495 {
 496    GLuint program_size = p->csr - p->program;
 497    GLuint decl_size = p->decl - p->declarations;
 498
 499    if (p->nr_tex_indirect > I915_MAX_TEX_INDIRECT) {
 500       i915_program_error(p, "Exceeded max nr indirect texture lookups "
 501                          "(%d out of %d)",
 502                          p->nr_tex_indirect, I915_MAX_TEX_INDIRECT);
 503    }
 504
 505    if (p->nr_tex_insn > I915_MAX_TEX_INSN) {
 506       i915_program_error(p, "Exceeded max TEX instructions (%d out of %d)",
 507                          p->nr_tex_insn, I915_MAX_TEX_INSN);
 508    }
 509
 510    if (p->nr_alu_insn > I915_MAX_ALU_INSN)
 511       i915_program_error(p, "Exceeded max ALU instructions (%d out of %d)",
 512                          p->nr_alu_insn, I915_MAX_ALU_INSN);
 513
 514    if (p->nr_decl_insn > I915_MAX_DECL_INSN) {
 515       i915_program_error(p, "Exceeded max DECL instructions (%d out of %d)",
 516                          p->nr_decl_insn, I915_MAX_DECL_INSN);
 517    }
 518
 519    if (p->error) {
 520       p->FragProg.Base.NumNativeInstructions = 0;
 521       p->FragProg.Base.NumNativeAluInstructions = 0;
 522       p->FragProg.Base.NumNativeTexInstructions = 0;
 523       p->FragProg.Base.NumNativeTexIndirections = 0;
 524    }
 525    else {
 526       p->FragProg.Base.NumNativeInstructions = (p->nr_alu_insn +
 527                                                 p->nr_tex_insn +
 528                                                 p->nr_decl_insn);
 529       p->FragProg.Base.NumNativeAluInstructions = p->nr_alu_insn;
 530       p->FragProg.Base.NumNativeTexInstructions = p->nr_tex_insn;
 531       p->FragProg.Base.NumNativeTexIndirections = p->nr_tex_indirect;
 532    }
 533
 534    p->declarations[0] |= program_size + decl_size - 2;
 535 }
 536
 537 void
 538 i915_upload_program(struct i915_context *i915,
 539                     struct i915_fragment_program *p)
 540 {
 541    GLuint program_size = p->csr - p->program;
 542    GLuint decl_size = p->decl - p->declarations;
 543
 544    if (p->error)
 545       return;
 546
 547    /* Could just go straight to the batchbuffer from here:
 548     */
 549    if (i915->state.ProgramSize != (program_size + decl_size) ||
 550        memcmp(i915->state.Program + decl_size, p->program,
 551               program_size * sizeof(int)) != 0) {
 552       I915_STATECHANGE(i915, I915_UPLOAD_PROGRAM);
 553       memcpy(i915->state.Program, p->declarations, decl_size * sizeof(int));
 554       memcpy(i915->state.Program + decl_size, p->program,
 555              program_size * sizeof(int));
 556       i915->state.ProgramSize = decl_size + program_size;
 557    }
 558
 559    /* Always seemed to get a failure if I used memcmp() to
 560     * shortcircuit this state upload.  Needs further investigation?
 561     */
 562    if (p->nr_constants) {
 563       GLuint nr = p->nr_constants;
 564
 565       I915_ACTIVESTATE(i915, I915_UPLOAD_CONSTANTS, 1);
 566       I915_STATECHANGE(i915, I915_UPLOAD_CONSTANTS);
 567
 568       i915->state.Constant[0] = _3DSTATE_PIXEL_SHADER_CONSTANTS | ((nr) * 4);
 569       i915->state.Constant[1] = (1 << (nr - 1)) | ((1 << (nr - 1)) - 1);
 570
 571       memcpy(&i915->state.Constant[2], p->constant, 4 * sizeof(int) * (nr));
 572       i915->state.ConstantSize = 2 + (nr) * 4;
 573
 574       if (0) {
 575          GLuint i;
 576          for (i = 0; i < nr; i++) {
 577             fprintf(stderr, "const[%d]: %f %f %f %f\n", i,
 578                     p->constant[i][0],
 579                     p->constant[i][1], p->constant[i][2], p->constant[i][3]);
 580          }
 581       }
 582    }
 583    else {
 584       I915_ACTIVESTATE(i915, I915_UPLOAD_CONSTANTS, 0);
 585    }
 586
 587    p->on_hardware = 1;
 588 }