src/mesa/main/texenvprogram.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2003 Tungsten Graphics, Inc., Cedar Park, Texas.
   4  * All Rights Reserved.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the
   8  * "Software"), to deal in the Software without restriction, including
   9  * without limitation the rights to use, copy, modify, merge, publish,
  10  * distribute, sub license, and/or sell copies of the Software, and to
  11  * permit persons to whom the Software is furnished to do so, subject to
  12  * the following conditions:
  13  *
  14  * The above copyright notice and this permission notice (including the
  15  * next paragraph) shall be included in all copies or substantial portions
  16  * of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  19  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  20  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  21  * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
  22  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  23  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  24  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  *
  26  **************************************************************************/
  27
  28 #include "glheader.h"
  29 #include "macros.h"
  30 #include "enums.h"
  31 #include "shader/prog_parameter.h"
  32 #include "shader/prog_instruction.h"
  33 #include "shader/prog_print.h"
  34 #include "shader/prog_statevars.h"
  35 #include "shader/programopt.h"
  36 #include "texenvprogram.h"
  37
  38 /**
  39  * According to Glean's texCombine test, no more than 21 instructions
  40  * are needed.  Allow a few extra just in case.
  41  */
  42 #define MAX_INSTRUCTIONS 24
  43
  44 #define DISASSEM (MESA_VERBOSE & VERBOSE_DISASSEM)
  45
  46 struct mode_opt {
  47    GLuint Source:4;
  48    GLuint Operand:3;
  49 };
  50
  51 struct state_key {
  52    GLbitfield enabled_units;
  53    GLuint separate_specular:1;
  54    GLuint fog_enabled:1;
  55    GLuint fog_mode:2;
  56
  57    struct {
  58       GLuint enabled:1;
  59       GLuint source_index:3;   /* one of TEXTURE_1D/2D/3D/CUBE/RECT_INDEX */
  60       GLuint ScaleShiftRGB:2;
  61       GLuint ScaleShiftA:2;
  62
  63       GLuint NumArgsRGB:2;
  64       GLuint ModeRGB:4;
  65       struct mode_opt OptRGB[3];
  66
  67       GLuint NumArgsA:2;
  68       GLuint ModeA:4;
  69       struct mode_opt OptA[3];
  70    } unit[8];
  71 };
  72
  73 #define FOG_LINEAR  0
  74 #define FOG_EXP     1
  75 #define FOG_EXP2    2
  76 #define FOG_UNKNOWN 3
  77
  78 static GLuint translate_fog_mode( GLenum mode )
  79 {
  80    switch (mode) {
  81    case GL_LINEAR: return FOG_LINEAR;
  82    case GL_EXP: return FOG_EXP;
  83    case GL_EXP2: return FOG_EXP2;
  84    default: return FOG_UNKNOWN;
  85    }
  86 }
  87
  88 #define OPR_SRC_COLOR           0
  89 #define OPR_ONE_MINUS_SRC_COLOR 1
  90 #define OPR_SRC_ALPHA           2
  91 #define OPR_ONE_MINUS_SRC_ALPHA 3
  92 #define OPR_ZERO                4
  93 #define OPR_ONE                 5
  94 #define OPR_UNKNOWN             7
  95
  96 static GLuint translate_operand( GLenum operand )
  97 {
  98    switch (operand) {
  99    case GL_SRC_COLOR: return OPR_SRC_COLOR;
 100    case GL_ONE_MINUS_SRC_COLOR: return OPR_ONE_MINUS_SRC_COLOR;
 101    case GL_SRC_ALPHA: return OPR_SRC_ALPHA;
 102    case GL_ONE_MINUS_SRC_ALPHA: return OPR_ONE_MINUS_SRC_ALPHA;
 103    case GL_ZERO: return OPR_ZERO;
 104    case GL_ONE: return OPR_ONE;
 105    default:     return OPR_UNKNOWN;
 106    }
 107 }
 108
 109 #define SRC_TEXTURE  0
 110 #define SRC_TEXTURE0 1
 111 #define SRC_TEXTURE1 2
 112 #define SRC_TEXTURE2 3
 113 #define SRC_TEXTURE3 4
 114 #define SRC_TEXTURE4 5
 115 #define SRC_TEXTURE5 6
 116 #define SRC_TEXTURE6 7
 117 #define SRC_TEXTURE7 8
 118 #define SRC_CONSTANT 9
 119 #define SRC_PRIMARY_COLOR 10
 120 #define SRC_PREVIOUS 11
 121 #define SRC_UNKNOWN  15
 122
 123 static GLuint translate_source( GLenum src )
 124 {
 125    switch (src) {
 126    case GL_TEXTURE: return SRC_TEXTURE;
 127    case GL_TEXTURE0:
 128    case GL_TEXTURE1:
 129    case GL_TEXTURE2:
 130    case GL_TEXTURE3:
 131    case GL_TEXTURE4:
 132    case GL_TEXTURE5:
 133    case GL_TEXTURE6:
 134    case GL_TEXTURE7: return SRC_TEXTURE0 + (src - GL_TEXTURE0);
 135    case GL_CONSTANT: return SRC_CONSTANT;
 136    case GL_PRIMARY_COLOR: return SRC_PRIMARY_COLOR;
 137    case GL_PREVIOUS: return SRC_PREVIOUS;
 138    default: return SRC_UNKNOWN;
 139    }
 140 }
 141
 142 #define MODE_REPLACE       0
 143 #define MODE_MODULATE      1
 144 #define MODE_ADD           2
 145 #define MODE_ADD_SIGNED    3
 146 #define MODE_INTERPOLATE   4
 147 #define MODE_SUBTRACT      5
 148 #define MODE_DOT3_RGB      6
 149 #define MODE_DOT3_RGB_EXT  7
 150 #define MODE_DOT3_RGBA     8
 151 #define MODE_DOT3_RGBA_EXT 9
 152 #define MODE_MODULATE_ADD_ATI           10
 153 #define MODE_MODULATE_SIGNED_ADD_ATI    11
 154 #define MODE_MODULATE_SUBTRACT_ATI      12
 155 #define MODE_UNKNOWN       15
 156
 157 static GLuint translate_mode( GLenum mode )
 158 {
 159    switch (mode) {
 160    case GL_REPLACE: return MODE_REPLACE;
 161    case GL_MODULATE: return MODE_MODULATE;
 162    case GL_ADD: return MODE_ADD;
 163    case GL_ADD_SIGNED: return MODE_ADD_SIGNED;
 164    case GL_INTERPOLATE: return MODE_INTERPOLATE;
 165    case GL_SUBTRACT: return MODE_SUBTRACT;
 166    case GL_DOT3_RGB: return MODE_DOT3_RGB;
 167    case GL_DOT3_RGB_EXT: return MODE_DOT3_RGB_EXT;
 168    case GL_DOT3_RGBA: return MODE_DOT3_RGBA;
 169    case GL_DOT3_RGBA_EXT: return MODE_DOT3_RGBA_EXT;
 170    case GL_MODULATE_ADD_ATI: return MODE_MODULATE_ADD_ATI;
 171    case GL_MODULATE_SIGNED_ADD_ATI: return MODE_MODULATE_SIGNED_ADD_ATI;
 172    case GL_MODULATE_SUBTRACT_ATI: return MODE_MODULATE_SUBTRACT_ATI;
 173    default: return MODE_UNKNOWN;
 174    }
 175 }
 176
 177 #define TEXTURE_UNKNOWN_INDEX 7
 178 static GLuint translate_tex_src_bit( GLbitfield bit )
 179 {
 180    switch (bit) {
 181    case TEXTURE_1D_BIT:   return TEXTURE_1D_INDEX;
 182    case TEXTURE_2D_BIT:   return TEXTURE_2D_INDEX;
 183    case TEXTURE_RECT_BIT: return TEXTURE_RECT_INDEX;
 184    case TEXTURE_3D_BIT:   return TEXTURE_3D_INDEX;
 185    case TEXTURE_CUBE_BIT: return TEXTURE_CUBE_INDEX;
 186    default: return TEXTURE_UNKNOWN_INDEX;
 187    }
 188 }
 189
 190 /**
 191  * Examine current texture environment state and generate a unique
 192  * key to identify it.
 193  */
 194 static void make_state_key( GLcontext *ctx,  struct state_key *key )
 195 {
 196    GLuint i, j;
 197
 198    memset(key, 0, sizeof(*key));
 199
 200    for (i=0;i<MAX_TEXTURE_UNITS;i++) {
 201       const struct gl_texture_unit *texUnit = &ctx->Texture.Unit[i];
 202
 203       if (!texUnit->_ReallyEnabled)
 204          continue;
 205
 206       key->unit[i].enabled = 1;
 207       key->enabled_units |= (1<<i);
 208
 209       key->unit[i].source_index =
 210          translate_tex_src_bit(texUnit->_ReallyEnabled);
 211
 212       key->unit[i].NumArgsRGB = texUnit->_CurrentCombine->_NumArgsRGB;
 213       key->unit[i].NumArgsA = texUnit->_CurrentCombine->_NumArgsA;
 214
 215       key->unit[i].ModeRGB =
 216          translate_mode(texUnit->_CurrentCombine->ModeRGB);
 217       key->unit[i].ModeA =
 218          translate_mode(texUnit->_CurrentCombine->ModeA);
 219
 220       key->unit[i].ScaleShiftRGB = texUnit->_CurrentCombine->ScaleShiftRGB;
 221       key->unit[i].ScaleShiftA = texUnit->_CurrentCombine->ScaleShiftA;
 222
 223       for (j=0;j<3;j++) {
 224          key->unit[i].OptRGB[j].Operand =
 225             translate_operand(texUnit->_CurrentCombine->OperandRGB[j]);
 226          key->unit[i].OptA[j].Operand =
 227             translate_operand(texUnit->_CurrentCombine->OperandA[j]);
 228          key->unit[i].OptRGB[j].Source =
 229             translate_source(texUnit->_CurrentCombine->SourceRGB[j]);
 230          key->unit[i].OptA[j].Source =
 231             translate_source(texUnit->_CurrentCombine->SourceA[j]);
 232       }
 233    }
 234
 235    if (ctx->_TriangleCaps & DD_SEPARATE_SPECULAR)
 236       key->separate_specular = 1;
 237
 238    if (ctx->Fog.Enabled) {
 239       key->fog_enabled = 1;
 240       key->fog_mode = translate_fog_mode(ctx->Fog.Mode);
 241    }
 242 }
 243
 244 /* Use uregs to represent registers internally, translate to Mesa's
 245  * expected formats on emit.
 246  *
 247  * NOTE: These are passed by value extensively in this file rather
 248  * than as usual by pointer reference.  If this disturbs you, try
 249  * remembering they are just 32bits in size.
 250  *
 251  * GCC is smart enough to deal with these dword-sized structures in
 252  * much the same way as if I had defined them as dwords and was using
 253  * macros to access and set the fields.  This is much nicer and easier
 254  * to evolve.
 255  */
 256 struct ureg {
 257    GLuint file:4;
 258    GLuint idx:8;
 259    GLuint negatebase:1;
 260    GLuint abs:1;
 261    GLuint negateabs:1;
 262    GLuint swz:12;
 263    GLuint pad:5;
 264 };
 265
 266 static const struct ureg undef = {
 267    PROGRAM_UNDEFINED,
 268    ~0,
 269    0,
 270    0,
 271    0,
 272    0,
 273    0
 274 };
 275
 276
 277 /* State used to build the fragment program:
 278  */
 279 struct texenv_fragment_program {
 280    struct gl_fragment_program *program;
 281    GLcontext *ctx;
 282    struct state_key *state;
 283
 284    GLbitfield alu_temps;        /* Track texture indirections, see spec. */
 285    GLbitfield temps_output;     /* Track texture indirections, see spec. */
 286    GLbitfield temp_in_use;      /* Tracks temporary regs which are in use. */
 287    GLboolean error;
 288
 289    struct ureg src_texture[MAX_TEXTURE_UNITS];
 290    /* Reg containing each texture unit's sampled texture color,
 291     * else undef.
 292     */
 293
 294    struct ureg src_previous;    /* Reg containing color from previous
 295                                  * stage.  May need to be decl'd.
 296                                  */
 297
 298    GLuint last_tex_stage;       /* Number of last enabled texture unit */
 299
 300    struct ureg half;
 301    struct ureg one;
 302    struct ureg zero;
 303 };
 304
 305
 306
 307 static struct ureg make_ureg(GLuint file, GLuint idx)
 308 {
 309    struct ureg reg;
 310    reg.file = file;
 311    reg.idx = idx;
 312    reg.negatebase = 0;
 313    reg.abs = 0;
 314    reg.negateabs = 0;
 315    reg.swz = SWIZZLE_NOOP;
 316    reg.pad = 0;
 317    return reg;
 318 }
 319
 320 static struct ureg swizzle( struct ureg reg, int x, int y, int z, int w )
 321 {
 322    reg.swz = MAKE_SWIZZLE4(GET_SWZ(reg.swz, x),
 323                            GET_SWZ(reg.swz, y),
 324                            GET_SWZ(reg.swz, z),
 325                            GET_SWZ(reg.swz, w));
 326
 327    return reg;
 328 }
 329
 330 static struct ureg swizzle1( struct ureg reg, int x )
 331 {
 332    return swizzle(reg, x, x, x, x);
 333 }
 334
 335 static struct ureg negate( struct ureg reg )
 336 {
 337    reg.negatebase ^= 1;
 338    return reg;
 339 }
 340
 341 static GLboolean is_undef( struct ureg reg )
 342 {
 343    return reg.file == PROGRAM_UNDEFINED;
 344 }
 345
 346
 347 static struct ureg get_temp( struct texenv_fragment_program *p )
 348 {
 349    GLint bit;
 350
 351    /* First try and reuse temps which have been used already:
 352     */
 353    bit = _mesa_ffs( ~p->temp_in_use & p->alu_temps );
 354
 355    /* Then any unused temporary:
 356     */
 357    if (!bit)
 358       bit = _mesa_ffs( ~p->temp_in_use );
 359
 360    if (!bit) {
 361       _mesa_problem(NULL, "%s: out of temporaries\n", __FILE__);
 362       _mesa_exit(1);
 363    }
 364
 365    if ((GLuint) bit > p->program->Base.NumTemporaries)
 366       p->program->Base.NumTemporaries = bit;
 367
 368    p->temp_in_use |= 1<<(bit-1);
 369    return make_ureg(PROGRAM_TEMPORARY, (bit-1));
 370 }
 371
 372 static struct ureg get_tex_temp( struct texenv_fragment_program *p )
 373 {
 374    int bit;
 375
 376    /* First try to find availble temp not previously used (to avoid
 377     * starting a new texture indirection).  According to the spec, the
 378     * ~p->temps_output isn't necessary, but will keep it there for
 379     * now:
 380     */
 381    bit = _mesa_ffs( ~p->temp_in_use & ~p->alu_temps & ~p->temps_output );
 382
 383    /* Then any unused temporary:
 384     */
 385    if (!bit)
 386       bit = _mesa_ffs( ~p->temp_in_use );
 387
 388    if (!bit) {
 389       _mesa_problem(NULL, "%s: out of temporaries\n", __FILE__);
 390       _mesa_exit(1);
 391    }
 392
 393    if ((GLuint) bit > p->program->Base.NumTemporaries)
 394       p->program->Base.NumTemporaries = bit;
 395
 396    p->temp_in_use |= 1<<(bit-1);
 397    return make_ureg(PROGRAM_TEMPORARY, (bit-1));
 398 }
 399
 400
 401 static void release_temps( struct texenv_fragment_program *p )
 402 {
 403    GLuint max_temp = p->ctx->Const.FragmentProgram.MaxTemps;
 404
 405    /* KW: To support tex_env_crossbar, don't release the registers in
 406     * temps_output.
 407     */
 408    if (max_temp >= sizeof(int) * 8)
 409       p->temp_in_use = p->temps_output;
 410    else
 411       p->temp_in_use = ~((1<<max_temp)-1) | p->temps_output;
 412 }
 413
 414
 415 static struct ureg register_param5( struct texenv_fragment_program *p,
 416                                     GLint s0,
 417                                     GLint s1,
 418                                     GLint s2,
 419                                     GLint s3,
 420                                     GLint s4)
 421 {
 422    gl_state_index tokens[STATE_LENGTH];
 423    GLuint idx;
 424    tokens[0] = s0;
 425    tokens[1] = s1;
 426    tokens[2] = s2;
 427    tokens[3] = s3;
 428    tokens[4] = s4;
 429    idx = _mesa_add_state_reference( p->program->Base.Parameters, tokens );
 430    return make_ureg(PROGRAM_STATE_VAR, idx);
 431 }
 432
 433
 434 #define register_param1(p,s0)          register_param5(p,s0,0,0,0,0)
 435 #define register_param2(p,s0,s1)       register_param5(p,s0,s1,0,0,0)
 436 #define register_param3(p,s0,s1,s2)    register_param5(p,s0,s1,s2,0,0)
 437 #define register_param4(p,s0,s1,s2,s3) register_param5(p,s0,s1,s2,s3,0)
 438
 439
 440 static struct ureg register_input( struct texenv_fragment_program *p, GLuint input )
 441 {
 442    p->program->Base.InputsRead |= (1 << input);
 443    return make_ureg(PROGRAM_INPUT, input);
 444 }
 445
 446
 447 static void emit_arg( struct prog_src_register *reg,
 448                       struct ureg ureg )
 449 {
 450    reg->File = ureg.file;
 451    reg->Index = ureg.idx;
 452    reg->Swizzle = ureg.swz;
 453    reg->NegateBase = ureg.negatebase ? 0xf : 0x0;
 454    reg->Abs = ureg.abs;
 455    reg->NegateAbs = ureg.negateabs;
 456 }
 457
 458 static void emit_dst( struct prog_dst_register *dst,
 459                       struct ureg ureg, GLuint mask )
 460 {
 461    dst->File = ureg.file;
 462    dst->Index = ureg.idx;
 463    dst->WriteMask = mask;
 464    dst->CondMask = 0;
 465    dst->CondSwizzle = 0;
 466 }
 467
 468 static struct prog_instruction *
 469 emit_op(struct texenv_fragment_program *p,
 470         enum prog_opcode op,
 471         struct ureg dest,
 472         GLuint mask,
 473         GLboolean saturate,
 474         struct ureg src0,
 475         struct ureg src1,
 476         struct ureg src2 )
 477 {
 478    GLuint nr = p->program->Base.NumInstructions++;
 479    struct prog_instruction *inst = &p->program->Base.Instructions[nr];
 480
 481    _mesa_init_instructions(inst, 1);
 482    inst->Opcode = op;
 483
 484    emit_arg( &inst->SrcReg[0], src0 );
 485    emit_arg( &inst->SrcReg[1], src1 );
 486    emit_arg( &inst->SrcReg[2], src2 );
 487
 488    inst->SaturateMode = saturate ? SATURATE_ZERO_ONE : SATURATE_OFF;
 489
 490    emit_dst( &inst->DstReg, dest, mask );
 491
 492    /* Accounting for indirection tracking:
 493     */
 494    if (dest.file == PROGRAM_TEMPORARY)
 495       p->temps_output |= 1 << dest.idx;
 496
 497    return inst;
 498 }
 499
 500
 501 static struct ureg emit_arith( struct texenv_fragment_program *p,
 502                                enum prog_opcode op,
 503                                struct ureg dest,
 504                                GLuint mask,
 505                                GLboolean saturate,
 506                                struct ureg src0,
 507                                struct ureg src1,
 508                                struct ureg src2 )
 509 {
 510    emit_op(p, op, dest, mask, saturate, src0, src1, src2);
 511
 512    /* Accounting for indirection tracking:
 513     */
 514    if (src0.file == PROGRAM_TEMPORARY)
 515       p->alu_temps |= 1 << src0.idx;
 516
 517    if (!is_undef(src1) && src1.file == PROGRAM_TEMPORARY)
 518       p->alu_temps |= 1 << src1.idx;
 519
 520    if (!is_undef(src2) && src2.file == PROGRAM_TEMPORARY)
 521       p->alu_temps |= 1 << src2.idx;
 522
 523    if (dest.file == PROGRAM_TEMPORARY)
 524       p->alu_temps |= 1 << dest.idx;
 525
 526    p->program->Base.NumAluInstructions++;
 527    return dest;
 528 }
 529
 530 static struct ureg emit_texld( struct texenv_fragment_program *p,
 531                                enum prog_opcode op,
 532                                struct ureg dest,
 533                                GLuint destmask,
 534                                GLuint tex_unit,
 535                                GLuint tex_idx,
 536                                struct ureg coord )
 537 {
 538    struct prog_instruction *inst = emit_op( p, op,
 539                                           dest, destmask,
 540                                           GL_FALSE,     /* don't saturate? */
 541                                           coord,        /* arg 0? */
 542                                           undef,
 543                                           undef);
 544
 545    inst->TexSrcTarget = tex_idx;
 546    inst->TexSrcUnit = tex_unit;
 547
 548    p->program->Base.NumTexInstructions++;
 549
 550    /* Is this a texture indirection?
 551     */
 552    if ((coord.file == PROGRAM_TEMPORARY &&
 553         (p->temps_output & (1<<coord.idx))) ||
 554        (dest.file == PROGRAM_TEMPORARY &&
 555         (p->alu_temps & (1<<dest.idx)))) {
 556       p->program->Base.NumTexIndirections++;
 557       p->temps_output = 1<<coord.idx;
 558       p->alu_temps = 0;
 559       assert(0);                /* KW: texture env crossbar */
 560    }
 561
 562    return dest;
 563 }
 564
 565
 566 static struct ureg register_const4f( struct texenv_fragment_program *p,
 567                                      GLfloat s0,
 568                                      GLfloat s1,
 569                                      GLfloat s2,
 570                                      GLfloat s3)
 571 {
 572    GLfloat values[4];
 573    GLuint idx, swizzle;
 574    values[0] = s0;
 575    values[1] = s1;
 576    values[2] = s2;
 577    values[3] = s3;
 578    idx = _mesa_add_unnamed_constant( p->program->Base.Parameters, values, 4,
 579                                      &swizzle );
 580    ASSERT(swizzle == SWIZZLE_NOOP);
 581    return make_ureg(PROGRAM_STATE_VAR, idx);
 582 }
 583
 584 #define register_scalar_const(p, s0)    register_const4f(p, s0, s0, s0, s0)
 585 #define register_const1f(p, s0)         register_const4f(p, s0, 0, 0, 1)
 586 #define register_const2f(p, s0, s1)     register_const4f(p, s0, s1, 0, 1)
 587 #define register_const3f(p, s0, s1, s2) register_const4f(p, s0, s1, s2, 1)
 588
 589
 590 static struct ureg get_one( struct texenv_fragment_program *p )
 591 {
 592    if (is_undef(p->one))
 593       p->one = register_scalar_const(p, 1.0);
 594    return p->one;
 595 }
 596
 597 static struct ureg get_half( struct texenv_fragment_program *p )
 598 {
 599    if (is_undef(p->half))
 600       p->half = register_scalar_const(p, 0.5);
 601    return p->half;
 602 }
 603
 604 static struct ureg get_zero( struct texenv_fragment_program *p )
 605 {
 606    if (is_undef(p->zero))
 607       p->zero = register_scalar_const(p, 0.0);
 608    return p->zero;
 609 }
 610
 611
 612 static void program_error( struct texenv_fragment_program *p, const char *msg )
 613 {
 614    _mesa_problem(NULL, msg);
 615    p->error = 1;
 616 }
 617
 618 static struct ureg get_source( struct texenv_fragment_program *p,
 619                                GLuint src, GLuint unit )
 620 {
 621    switch (src) {
 622    case SRC_TEXTURE:
 623       assert(!is_undef(p->src_texture[unit]));
 624       return p->src_texture[unit];
 625
 626    case SRC_TEXTURE0:
 627    case SRC_TEXTURE1:
 628    case SRC_TEXTURE2:
 629    case SRC_TEXTURE3:
 630    case SRC_TEXTURE4:
 631    case SRC_TEXTURE5:
 632    case SRC_TEXTURE6:
 633    case SRC_TEXTURE7:
 634       assert(!is_undef(p->src_texture[src - SRC_TEXTURE0]));
 635       return p->src_texture[src - SRC_TEXTURE0];
 636
 637    case SRC_CONSTANT:
 638       return register_param2(p, STATE_TEXENV_COLOR, unit);
 639
 640    case SRC_PRIMARY_COLOR:
 641       return register_input(p, FRAG_ATTRIB_COL0);
 642
 643    case SRC_PREVIOUS:
 644    default:
 645       if (is_undef(p->src_previous))
 646          return register_input(p, FRAG_ATTRIB_COL0);
 647       else
 648          return p->src_previous;
 649    }
 650 }
 651
 652 static struct ureg emit_combine_source( struct texenv_fragment_program *p,
 653                                         GLuint mask,
 654                                         GLuint unit,
 655                                         GLuint source,
 656                                         GLuint operand )
 657 {
 658    struct ureg arg, src, one;
 659
 660    src = get_source(p, source, unit);
 661
 662    switch (operand) {
 663    case OPR_ONE_MINUS_SRC_COLOR:
 664       /* Get unused tmp,
 665        * Emit tmp = 1.0 - arg.xyzw
 666        */
 667       arg = get_temp( p );
 668       one = get_one( p );
 669       return emit_arith( p, OPCODE_SUB, arg, mask, 0, one, src, undef);
 670
 671    case OPR_SRC_ALPHA:
 672       if (mask == WRITEMASK_W)
 673          return src;
 674       else
 675          return swizzle1( src, SWIZZLE_W );
 676    case OPR_ONE_MINUS_SRC_ALPHA:
 677       /* Get unused tmp,
 678        * Emit tmp = 1.0 - arg.wwww
 679        */
 680       arg = get_temp(p);
 681       one = get_one(p);
 682       return emit_arith(p, OPCODE_SUB, arg, mask, 0,
 683                         one, swizzle1(src, SWIZZLE_W), undef);
 684    case OPR_ZERO:
 685       return get_zero(p);
 686    case OPR_ONE:
 687       return get_one(p);
 688    case OPR_SRC_COLOR:
 689    default:
 690       return src;
 691    }
 692 }
 693
 694 static GLboolean args_match( struct state_key *key, GLuint unit )
 695 {
 696    GLuint i, nr = key->unit[unit].NumArgsRGB;
 697
 698    for (i = 0 ; i < nr ; i++) {
 699       if (key->unit[unit].OptA[i].Source != key->unit[unit].OptRGB[i].Source)
 700          return GL_FALSE;
 701
 702       switch(key->unit[unit].OptA[i].Operand) {
 703       case OPR_SRC_ALPHA:
 704          switch(key->unit[unit].OptRGB[i].Operand) {
 705          case OPR_SRC_COLOR:
 706          case OPR_SRC_ALPHA:
 707             break;
 708          default:
 709             return GL_FALSE;
 710          }
 711          break;
 712       case OPR_ONE_MINUS_SRC_ALPHA:
 713          switch(key->unit[unit].OptRGB[i].Operand) {
 714          case OPR_ONE_MINUS_SRC_COLOR:
 715          case OPR_ONE_MINUS_SRC_ALPHA:
 716             break;
 717          default:
 718             return GL_FALSE;
 719          }
 720          break;
 721       default:
 722          return GL_FALSE;       /* impossible */
 723       }
 724    }
 725
 726    return GL_TRUE;
 727 }
 728
 729 static struct ureg emit_combine( struct texenv_fragment_program *p,
 730                                  struct ureg dest,
 731                                  GLuint mask,
 732                                  GLboolean saturate,
 733                                  GLuint unit,
 734                                  GLuint nr,
 735                                  GLuint mode,
 736                                  const struct mode_opt *opt)
 737 {
 738    struct ureg src[3];
 739    struct ureg tmp, half;
 740    GLuint i;
 741
 742    tmp = undef; /* silence warning (bug 5318) */
 743
 744    for (i = 0; i < nr; i++)
 745       src[i] = emit_combine_source( p, mask, unit, opt[i].Source, opt[i].Operand );
 746
 747    switch (mode) {
 748    case MODE_REPLACE:
 749       if (mask == WRITEMASK_XYZW && !saturate)
 750          return src[0];
 751       else
 752          return emit_arith( p, OPCODE_MOV, dest, mask, saturate, src[0], undef, undef );
 753    case MODE_MODULATE:
 754       return emit_arith( p, OPCODE_MUL, dest, mask, saturate,
 755                          src[0], src[1], undef );
 756    case MODE_ADD:
 757       return emit_arith( p, OPCODE_ADD, dest, mask, saturate,
 758                          src[0], src[1], undef );
 759    case MODE_ADD_SIGNED:
 760       /* tmp = arg0 + arg1
 761        * result = tmp - .5
 762        */
 763       half = get_half(p);
 764       tmp = get_temp( p );
 765       emit_arith( p, OPCODE_ADD, tmp, mask, 0, src[0], src[1], undef );
 766       emit_arith( p, OPCODE_SUB, dest, mask, saturate, tmp, half, undef );
 767       return dest;
 768    case MODE_INTERPOLATE:
 769       /* Arg0 * (Arg2) + Arg1 * (1-Arg2) -- note arguments are reordered:
 770        */
 771       return emit_arith( p, OPCODE_LRP, dest, mask, saturate, src[2], src[0], src[1] );
 772
 773    case MODE_SUBTRACT:
 774       return emit_arith( p, OPCODE_SUB, dest, mask, saturate, src[0], src[1], undef );
 775
 776    case MODE_DOT3_RGBA:
 777    case MODE_DOT3_RGBA_EXT:
 778    case MODE_DOT3_RGB_EXT:
 779    case MODE_DOT3_RGB: {
 780       struct ureg tmp0 = get_temp( p );
 781       struct ureg tmp1 = get_temp( p );
 782       struct ureg neg1 = register_scalar_const(p, -1);
 783       struct ureg two  = register_scalar_const(p, 2);
 784
 785       /* tmp0 = 2*src0 - 1
 786        * tmp1 = 2*src1 - 1
 787        *
 788        * dst = tmp0 dot3 tmp1
 789        */
 790       emit_arith( p, OPCODE_MAD, tmp0, WRITEMASK_XYZW, 0,
 791                   two, src[0], neg1);
 792
 793       if (_mesa_memcmp(&src[0], &src[1], sizeof(struct ureg)) == 0)
 794          tmp1 = tmp0;
 795       else
 796          emit_arith( p, OPCODE_MAD, tmp1, WRITEMASK_XYZW, 0,
 797                      two, src[1], neg1);
 798       emit_arith( p, OPCODE_DP3, dest, mask, saturate, tmp0, tmp1, undef);
 799       return dest;
 800    }
 801    case MODE_MODULATE_ADD_ATI:
 802       /* Arg0 * Arg2 + Arg1 */
 803       return emit_arith( p, OPCODE_MAD, dest, mask, saturate,
 804                          src[0], src[2], src[1] );
 805    case MODE_MODULATE_SIGNED_ADD_ATI: {
 806       /* Arg0 * Arg2 + Arg1 - 0.5 */
 807       struct ureg tmp0 = get_temp(p);
 808       half = get_half(p);
 809       emit_arith( p, OPCODE_MAD, tmp0, mask, 0, src[0], src[2], src[1] );
 810       emit_arith( p, OPCODE_SUB, dest, mask, saturate, tmp0, half, undef );
 811       return dest;
 812    }
 813    case MODE_MODULATE_SUBTRACT_ATI:
 814       /* Arg0 * Arg2 - Arg1 */
 815       emit_arith( p, OPCODE_MAD, dest, mask, 0, src[0], src[2], negate(src[1]) );
 816       return dest;
 817    default:
 818       return src[0];
 819    }
 820 }
 821
 822
 823 /**
 824  * Generate instructions for one texture unit's env/combiner mode.
 825  */
 826 static struct ureg
 827 emit_texenv(struct texenv_fragment_program *p, GLuint unit)
 828 {
 829    struct state_key *key = p->state;
 830    GLboolean saturate = (unit < p->last_tex_stage);
 831    GLuint rgb_shift, alpha_shift;
 832    struct ureg out, shift;
 833    struct ureg dest;
 834
 835    if (!key->unit[unit].enabled) {
 836       return get_source(p, SRC_PREVIOUS, 0);
 837    }
 838
 839    switch (key->unit[unit].ModeRGB) {
 840    case MODE_DOT3_RGB_EXT:
 841       alpha_shift = key->unit[unit].ScaleShiftA;
 842       rgb_shift = 0;
 843       break;
 844    case MODE_DOT3_RGBA_EXT:
 845       alpha_shift = 0;
 846       rgb_shift = 0;
 847       break;
 848    default:
 849       rgb_shift = key->unit[unit].ScaleShiftRGB;
 850       alpha_shift = key->unit[unit].ScaleShiftA;
 851       break;
 852    }
 853
 854    /* If this is the very last calculation, emit direct to output reg:
 855     */
 856    if (key->separate_specular ||
 857        unit != p->last_tex_stage ||
 858        alpha_shift ||
 859        rgb_shift)
 860       dest = get_temp( p );
 861    else
 862       dest = make_ureg(PROGRAM_OUTPUT, FRAG_RESULT_COLR);
 863
 864    /* Emit the RGB and A combine ops
 865     */
 866    if (key->unit[unit].ModeRGB == key->unit[unit].ModeA &&
 867        args_match(key, unit)) {
 868       out = emit_combine( p, dest, WRITEMASK_XYZW, saturate,
 869                           unit,
 870                           key->unit[unit].NumArgsRGB,
 871                           key->unit[unit].ModeRGB,
 872                           key->unit[unit].OptRGB);
 873    }
 874    else if (key->unit[unit].ModeRGB == MODE_DOT3_RGBA_EXT ||
 875             key->unit[unit].ModeRGB == MODE_DOT3_RGBA) {
 876
 877       out = emit_combine( p, dest, WRITEMASK_XYZW, saturate,
 878                           unit,
 879                           key->unit[unit].NumArgsRGB,
 880                           key->unit[unit].ModeRGB,
 881                           key->unit[unit].OptRGB);
 882    }
 883    else {
 884       /* Need to do something to stop from re-emitting identical
 885        * argument calculations here:
 886        */
 887       out = emit_combine( p, dest, WRITEMASK_XYZ, saturate,
 888                           unit,
 889                           key->unit[unit].NumArgsRGB,
 890                           key->unit[unit].ModeRGB,
 891                           key->unit[unit].OptRGB);
 892       out = emit_combine( p, dest, WRITEMASK_W, saturate,
 893                           unit,
 894                           key->unit[unit].NumArgsA,
 895                           key->unit[unit].ModeA,
 896                           key->unit[unit].OptA);
 897    }
 898
 899    /* Deal with the final shift:
 900     */
 901    if (alpha_shift || rgb_shift) {
 902       if (rgb_shift == alpha_shift) {
 903          shift = register_scalar_const(p, 1<<rgb_shift);
 904       }
 905       else {
 906          shift = register_const4f(p,
 907                                   1<<rgb_shift,
 908                                   1<<rgb_shift,
 909                                   1<<rgb_shift,
 910                                   1<<alpha_shift);
 911       }
 912       return emit_arith( p, OPCODE_MUL, dest, WRITEMASK_XYZW,
 913                          saturate, out, shift, undef );
 914    }
 915    else
 916       return out;
 917 }
 918
 919
 920 /**
 921  * Generate instruction for getting a texture source term.
 922  */
 923 static void load_texture( struct texenv_fragment_program *p, GLuint unit )
 924 {
 925    if (is_undef(p->src_texture[unit])) {
 926       GLuint dim = p->state->unit[unit].source_index;
 927       struct ureg texcoord = register_input(p, FRAG_ATTRIB_TEX0+unit);
 928       struct ureg tmp = get_tex_temp( p );
 929
 930       if (dim == TEXTURE_UNKNOWN_INDEX)
 931          program_error(p, "TexSrcBit");
 932
 933       /* TODO: Use D0_MASK_XY where possible.
 934        */
 935       if (p->state->unit[unit].enabled)
 936          p->src_texture[unit] = emit_texld( p, OPCODE_TXP,
 937                                             tmp, WRITEMASK_XYZW,
 938                                             unit, dim, texcoord );
 939       else
 940          p->src_texture[unit] = get_zero(p);
 941    }
 942 }
 943
 944 static GLboolean load_texenv_source( struct texenv_fragment_program *p,
 945                                      GLuint src, GLuint unit )
 946 {
 947    switch (src) {
 948    case SRC_TEXTURE:
 949       load_texture(p, unit);
 950       break;
 951
 952    case SRC_TEXTURE0:
 953    case SRC_TEXTURE1:
 954    case SRC_TEXTURE2:
 955    case SRC_TEXTURE3:
 956    case SRC_TEXTURE4:
 957    case SRC_TEXTURE5:
 958    case SRC_TEXTURE6:
 959    case SRC_TEXTURE7:
 960       load_texture(p, src - SRC_TEXTURE0);
 961       break;
 962
 963    default:
 964       break;
 965    }
 966
 967    return GL_TRUE;
 968 }
 969
 970
 971 /**
 972  * Generate instructions for loading all texture source terms.
 973  */
 974 static GLboolean
 975 load_texunit_sources( struct texenv_fragment_program *p, int unit )
 976 {
 977    struct state_key *key = p->state;
 978    GLuint i;
 979
 980    for (i = 0; i < key->unit[unit].NumArgsRGB; i++) {
 981       load_texenv_source( p, key->unit[unit].OptRGB[i].Source, unit);
 982    }
 983
 984    for (i = 0; i < key->unit[unit].NumArgsA; i++) {
 985       load_texenv_source( p, key->unit[unit].OptA[i].Source, unit );
 986    }
 987
 988    return GL_TRUE;
 989 }
 990
 991
 992 /**
 993  * Generate a new fragment program which implements the context's
 994  * current texture env/combine mode.
 995  */
 996 static void
 997 create_new_program(GLcontext *ctx, struct state_key *key,
 998                    struct gl_fragment_program *program)
 999 {
1000    struct prog_instruction instBuffer[MAX_INSTRUCTIONS];
1001    struct texenv_fragment_program p;
1002    GLuint unit;
1003    struct ureg cf, out;
1004
1005    _mesa_memset(&p, 0, sizeof(p));
1006    p.ctx = ctx;
1007    p.state = key;
1008    p.program = program;
1009
1010    /* During code generation, use locally-allocated instruction buffer,
1011     * then alloc dynamic storage below.
1012     */
1013    p.program->Base.Instructions = instBuffer;
1014    p.program->Base.Target = GL_FRAGMENT_PROGRAM_ARB;
1015    p.program->Base.NumTexIndirections = 1;      /* correct? */
1016    p.program->Base.NumTexInstructions = 0;
1017    p.program->Base.NumAluInstructions = 0;
1018    p.program->Base.String = NULL;
1019    p.program->Base.NumInstructions =
1020    p.program->Base.NumTemporaries =
1021    p.program->Base.NumParameters =
1022    p.program->Base.NumAttributes = p.program->Base.NumAddressRegs = 0;
1023    p.program->Base.Parameters = _mesa_new_parameter_list();
1024
1025    p.program->Base.InputsRead = 0;
1026    p.program->Base.OutputsWritten = 1 << FRAG_RESULT_COLR;
1027
1028    for (unit = 0; unit < MAX_TEXTURE_UNITS; unit++)
1029       p.src_texture[unit] = undef;
1030
1031    p.src_previous = undef;
1032    p.half = undef;
1033    p.zero = undef;
1034    p.one = undef;
1035
1036    p.last_tex_stage = 0;
1037    release_temps(&p);
1038
1039    if (key->enabled_units) {
1040       /* First pass - to support texture_env_crossbar, first identify
1041        * all referenced texture sources and emit texld instructions
1042        * for each:
1043        */
1044       for (unit = 0 ; unit < ctx->Const.MaxTextureUnits ; unit++)
1045          if (key->unit[unit].enabled) {
1046             load_texunit_sources( &p, unit );
1047             p.last_tex_stage = unit;
1048          }
1049
1050       /* Second pass - emit combine instructions to build final color:
1051        */
1052       for (unit = 0 ; unit < ctx->Const.MaxTextureUnits; unit++)
1053          if (key->enabled_units & (1<<unit)) {
1054             p.src_previous = emit_texenv( &p, unit );
1055             release_temps(&p);  /* release all temps */
1056          }
1057    }
1058
1059    cf = get_source( &p, SRC_PREVIOUS, 0 );
1060    out = make_ureg( PROGRAM_OUTPUT, FRAG_RESULT_COLR );
1061
1062    if (key->separate_specular) {
1063       /* Emit specular add.
1064        */
1065       struct ureg s = register_input(&p, FRAG_ATTRIB_COL1);
1066       emit_arith( &p, OPCODE_ADD, out, WRITEMASK_XYZ, 0, cf, s, undef );
1067       emit_arith( &p, OPCODE_MOV, out, WRITEMASK_W, 0, cf, undef, undef );
1068    }
1069    else if (_mesa_memcmp(&cf, &out, sizeof(cf)) != 0) {
1070       /* Will wind up in here if no texture enabled or a couple of
1071        * other scenarios (GL_REPLACE for instance).
1072        */
1073       emit_arith( &p, OPCODE_MOV, out, WRITEMASK_XYZW, 0, cf, undef, undef );
1074    }
1075
1076    /* Finish up:
1077     */
1078    emit_arith( &p, OPCODE_END, undef, WRITEMASK_XYZW, 0, undef, undef, undef);
1079
1080    if (key->fog_enabled) {
1081       /* Pull fog mode from GLcontext, the value in the state key is
1082        * a reduced value and not what is expected in FogOption
1083        */
1084       p.program->FogOption = ctx->Fog.Mode;
1085       p.program->Base.InputsRead |= FRAG_BIT_FOGC; /* XXX new */
1086    } else
1087       p.program->FogOption = GL_NONE;
1088
1089    if (p.program->Base.NumTexIndirections > ctx->Const.FragmentProgram.MaxTexIndirections)
1090       program_error(&p, "Exceeded max nr indirect texture lookups");
1091
1092    if (p.program->Base.NumTexInstructions > ctx->Const.FragmentProgram.MaxTexInstructions)
1093       program_error(&p, "Exceeded max TEX instructions");
1094
1095    if (p.program->Base.NumAluInstructions > ctx->Const.FragmentProgram.MaxAluInstructions)
1096       program_error(&p, "Exceeded max ALU instructions");
1097
1098    ASSERT(p.program->Base.NumInstructions <= MAX_INSTRUCTIONS);
1099
1100    /* Allocate final instruction array */
1101    p.program->Base.Instructions
1102       = _mesa_alloc_instructions(p.program->Base.NumInstructions);
1103    if (!p.program->Base.Instructions) {
1104       _mesa_error(ctx, GL_OUT_OF_MEMORY,
1105                   "generating tex env program");
1106       return;
1107    }
1108    _mesa_copy_instructions(p.program->Base.Instructions, instBuffer,
1109                            p.program->Base.NumInstructions);
1110
1111    if (p.program->FogOption) {
1112       _mesa_append_fog_code(ctx, p.program);
1113       p.program->FogOption = GL_NONE;
1114    }
1115
1116
1117    /* Notify driver the fragment program has (actually) changed.
1118     */
1119    if (ctx->Driver.ProgramStringNotify) {
1120       ctx->Driver.ProgramStringNotify( ctx, GL_FRAGMENT_PROGRAM_ARB,
1121                                        &p.program->Base );
1122    }
1123
1124    if (DISASSEM) {
1125       _mesa_print_program(&p.program->Base);
1126       _mesa_printf("\n");
1127    }
1128 }
1129
1130
1131 static struct gl_fragment_program *
1132 search_cache(const struct texenvprog_cache *cache,
1133              GLuint hash,
1134              const void *key,
1135              GLuint keysize)
1136 {
1137    struct texenvprog_cache_item *c;
1138
1139    for (c = cache->items[hash % cache->size]; c; c = c->next) {
1140       if (c->hash == hash && memcmp(c->key, key, keysize) == 0)
1141          return (struct gl_fragment_program *) c->data;
1142    }
1143
1144    return NULL;
1145 }
1146
1147 static void rehash( struct texenvprog_cache *cache )
1148 {
1149    struct texenvprog_cache_item **items;
1150    struct texenvprog_cache_item *c, *next;
1151    GLuint size, i;
1152
1153    size = cache->size * 3;
1154    items = (struct texenvprog_cache_item**) _mesa_malloc(size * sizeof(*items));
1155    _mesa_memset(items, 0, size * sizeof(*items));
1156
1157    for (i = 0; i < cache->size; i++)
1158       for (c = cache->items[i]; c; c = next) {
1159          next = c->next;
1160          c->next = items[c->hash % size];
1161          items[c->hash % size] = c;
1162       }
1163
1164    _mesa_free(cache->items);
1165    cache->items = items;
1166    cache->size = size;
1167 }
1168
1169 static void clear_cache( struct texenvprog_cache *cache )
1170 {
1171    struct texenvprog_cache_item *c, *next;
1172    GLuint i;
1173
1174    for (i = 0; i < cache->size; i++) {
1175       for (c = cache->items[i]; c; c = next) {
1176          next = c->next;
1177          _mesa_free(c->key);
1178          cache->ctx->Driver.DeleteProgram(cache->ctx,
1179                                           (struct gl_program *) c->data);
1180          _mesa_free(c);
1181       }
1182       cache->items[i] = NULL;
1183    }
1184
1185
1186    cache->n_items = 0;
1187 }
1188
1189
1190 static void cache_item( struct texenvprog_cache *cache,
1191                         GLuint hash,
1192                         const struct state_key *key,
1193                         void *data )
1194 {
1195    struct texenvprog_cache_item *c
1196       = (struct texenvprog_cache_item *) MALLOC(sizeof(*c));
1197    c->hash = hash;
1198
1199    c->key = _mesa_malloc(sizeof(*key));
1200    memcpy(c->key, key, sizeof(*key));
1201
1202    c->data = (struct gl_fragment_program *) data;
1203
1204    if (cache->n_items > cache->size * 1.5) {
1205       if (cache->size < 1000)
1206          rehash(cache);
1207       else
1208          clear_cache(cache);
1209    }
1210
1211    cache->n_items++;
1212    c->next = cache->items[hash % cache->size];
1213    cache->items[hash % cache->size] = c;
1214 }
1215
1216 static GLuint hash_key( const struct state_key *key )
1217 {
1218    GLuint *ikey = (GLuint *)key;
1219    GLuint hash = 0, i;
1220
1221    /* Make a slightly better attempt at a hash function:
1222     */
1223    for (i = 0; i < sizeof(*key)/sizeof(*ikey); i++)
1224    {
1225       hash += ikey[i];
1226       hash += (hash << 10);
1227       hash ^= (hash >> 6);
1228    }
1229
1230    return hash;
1231 }
1232
1233
1234 /**
1235  * If _MaintainTexEnvProgram is set we'll generate a fragment program that
1236  * implements the current texture env/combine mode.
1237  * This function generates that program and puts it into effect.
1238  */
1239 void
1240 _mesa_UpdateTexEnvProgram( GLcontext *ctx )
1241 {
1242    struct state_key key;
1243    GLuint hash;
1244    const struct gl_fragment_program *prev = ctx->FragmentProgram._Current;
1245
1246    ASSERT(ctx->FragmentProgram._MaintainTexEnvProgram);
1247
1248    /* If a conventional fragment program/shader isn't in effect... */
1249    if (!ctx->FragmentProgram._Enabled &&
1250        !ctx->Shader.CurrentProgram) {
1251       make_state_key(ctx, &key);
1252       hash = hash_key(&key);
1253
1254       ctx->FragmentProgram._Current =
1255       ctx->FragmentProgram._TexEnvProgram =
1256          search_cache(&ctx->Texture.env_fp_cache, hash, &key, sizeof(key));
1257
1258       if (!ctx->FragmentProgram._TexEnvProgram) {
1259          if (0)
1260             _mesa_printf("Building new texenv proggy for key %x\n", hash);
1261
1262          /* create new tex env program */
1263          ctx->FragmentProgram._Current =
1264          ctx->FragmentProgram._TexEnvProgram =
1265             (struct gl_fragment_program *)
1266             ctx->Driver.NewProgram(ctx, GL_FRAGMENT_PROGRAM_ARB, 0);
1267
1268          create_new_program(ctx, &key, ctx->FragmentProgram._TexEnvProgram);
1269
1270          cache_item(&ctx->Texture.env_fp_cache, hash, &key,
1271                     ctx->FragmentProgram._TexEnvProgram);
1272       }
1273       else {
1274          if (0)
1275             _mesa_printf("Found existing texenv program for key %x\n", hash);
1276       }
1277    }
1278    else {
1279       ctx->FragmentProgram._Current = ctx->FragmentProgram.Current;
1280    }
1281
1282    /* Tell the driver about the change.  Could define a new target for
1283     * this?
1284     */
1285    if (ctx->FragmentProgram._Current != prev && ctx->Driver.BindProgram) {
1286       ctx->Driver.BindProgram(ctx, GL_FRAGMENT_PROGRAM_ARB,
1287                          (struct gl_program *) ctx->FragmentProgram._Current);
1288    }
1289 }
1290
1291
1292 void _mesa_TexEnvProgramCacheInit( GLcontext *ctx )
1293 {
1294    ctx->Texture.env_fp_cache.ctx = ctx;
1295    ctx->Texture.env_fp_cache.size = 17;
1296    ctx->Texture.env_fp_cache.n_items = 0;
1297    ctx->Texture.env_fp_cache.items = (struct texenvprog_cache_item **)
1298       _mesa_calloc(ctx->Texture.env_fp_cache.size *
1299                    sizeof(struct texenvprog_cache_item));
1300 }
1301
1302
1303 void _mesa_TexEnvProgramCacheDestroy( GLcontext *ctx )
1304 {
1305    clear_cache(&ctx->Texture.env_fp_cache);
1306    _mesa_free(ctx->Texture.env_fp_cache.items);
1307 }