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