src/mesa/shader/program.c

   1 /*
   2  * Mesa 3-D graphics library
   3  * Version:  6.5.3
   4  *
   5  * Copyright (C) 1999-2007  Brian Paul   All Rights Reserved.
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a
   8  * copy of this software and associated documentation files (the "Software"),
   9  * to deal in the Software without restriction, including without limitation
  10  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  11  * and/or sell copies of the Software, and to permit persons to whom the
  12  * Software is furnished to do so, subject to the following conditions:
  13  *
  14  * The above copyright notice and this permission notice shall be included
  15  * in all copies or substantial portions of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  18  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  20  * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  21  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  22  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  23  */
  24
  25 /**
  26  * \file program.c
  27  * Vertex and fragment program support functions.
  28  * \author Brian Paul
  29  */
  30
  31
  32 #include "main/glheader.h"
  33 #include "main/context.h"
  34 #include "main/hash.h"
  35 #include "program.h"
  36 #include "prog_cache.h"
  37 #include "prog_parameter.h"
  38 #include "prog_instruction.h"
  39
  40
  41 /**
  42  * A pointer to this dummy program is put into the hash table when
  43  * glGenPrograms is called.
  44  */
  45 struct gl_program _mesa_DummyProgram;
  46
  47
  48 /**
  49  * Init context's vertex/fragment program state
  50  */
  51 void
  52 _mesa_init_program(GLcontext *ctx)
  53 {
  54    GLuint i;
  55
  56    /*
  57     * If this assertion fails, we need to increase the field
  58     * size for register indexes.
  59     */
  60    ASSERT(ctx->Const.VertexProgram.MaxUniformComponents / 4
  61           <= (1 << INST_INDEX_BITS));
  62    ASSERT(ctx->Const.FragmentProgram.MaxUniformComponents / 4
  63           <= (1 << INST_INDEX_BITS));
  64
  65    /* If this fails, increase prog_instruction::TexSrcUnit size */
  66    ASSERT(MAX_TEXTURE_UNITS < (1 << 5));
  67
  68    /* If this fails, increase prog_instruction::TexSrcTarget size */
  69    ASSERT(NUM_TEXTURE_TARGETS < (1 << 3));
  70
  71    ctx->Program.ErrorPos = -1;
  72    ctx->Program.ErrorString = _mesa_strdup("");
  73
  74 #if FEATURE_NV_vertex_program || FEATURE_ARB_vertex_program
  75    ctx->VertexProgram.Enabled = GL_FALSE;
  76 #if FEATURE_es2_glsl
  77    ctx->VertexProgram.PointSizeEnabled = GL_TRUE;
  78 #else
  79    ctx->VertexProgram.PointSizeEnabled = GL_FALSE;
  80 #endif
  81    ctx->VertexProgram.TwoSideEnabled = GL_FALSE;
  82    _mesa_reference_vertprog(ctx, &ctx->VertexProgram.Current,
  83                             ctx->Shared->DefaultVertexProgram);
  84    assert(ctx->VertexProgram.Current);
  85    for (i = 0; i < MAX_NV_VERTEX_PROGRAM_PARAMS / 4; i++) {
  86       ctx->VertexProgram.TrackMatrix[i] = GL_NONE;
  87       ctx->VertexProgram.TrackMatrixTransform[i] = GL_IDENTITY_NV;
  88    }
  89    ctx->VertexProgram.Cache = _mesa_new_program_cache();
  90 #endif
  91
  92 #if FEATURE_NV_fragment_program || FEATURE_ARB_fragment_program
  93    ctx->FragmentProgram.Enabled = GL_FALSE;
  94    _mesa_reference_fragprog(ctx, &ctx->FragmentProgram.Current,
  95                             ctx->Shared->DefaultFragmentProgram);
  96    assert(ctx->FragmentProgram.Current);
  97    ctx->FragmentProgram.Cache = _mesa_new_program_cache();
  98 #endif
  99
 100
 101    /* XXX probably move this stuff */
 102 #if FEATURE_ATI_fragment_shader
 103    ctx->ATIFragmentShader.Enabled = GL_FALSE;
 104    ctx->ATIFragmentShader.Current = ctx->Shared->DefaultFragmentShader;
 105    assert(ctx->ATIFragmentShader.Current);
 106    ctx->ATIFragmentShader.Current->RefCount++;
 107 #endif
 108 }
 109
 110
 111 /**
 112  * Free a context's vertex/fragment program state
 113  */
 114 void
 115 _mesa_free_program_data(GLcontext *ctx)
 116 {
 117 #if FEATURE_NV_vertex_program || FEATURE_ARB_vertex_program
 118    _mesa_reference_vertprog(ctx, &ctx->VertexProgram.Current, NULL);
 119    _mesa_delete_program_cache(ctx, ctx->VertexProgram.Cache);
 120 #endif
 121 #if FEATURE_NV_fragment_program || FEATURE_ARB_fragment_program
 122    _mesa_reference_fragprog(ctx, &ctx->FragmentProgram.Current, NULL);
 123    _mesa_delete_program_cache(ctx, ctx->FragmentProgram.Cache);
 124 #endif
 125    /* XXX probably move this stuff */
 126 #if FEATURE_ATI_fragment_shader
 127    if (ctx->ATIFragmentShader.Current) {
 128       ctx->ATIFragmentShader.Current->RefCount--;
 129       if (ctx->ATIFragmentShader.Current->RefCount <= 0) {
 130          free(ctx->ATIFragmentShader.Current);
 131       }
 132    }
 133 #endif
 134    free((void *) ctx->Program.ErrorString);
 135 }
 136
 137
 138 /**
 139  * Update the default program objects in the given context to reference those
 140  * specified in the shared state and release those referencing the old
 141  * shared state.
 142  */
 143 void
 144 _mesa_update_default_objects_program(GLcontext *ctx)
 145 {
 146 #if FEATURE_NV_vertex_program || FEATURE_ARB_vertex_program
 147    _mesa_reference_vertprog(ctx, &ctx->VertexProgram.Current,
 148                             (struct gl_vertex_program *)
 149                             ctx->Shared->DefaultVertexProgram);
 150    assert(ctx->VertexProgram.Current);
 151 #endif
 152
 153 #if FEATURE_NV_fragment_program || FEATURE_ARB_fragment_program
 154    _mesa_reference_fragprog(ctx, &ctx->FragmentProgram.Current,
 155                             (struct gl_fragment_program *)
 156                             ctx->Shared->DefaultFragmentProgram);
 157    assert(ctx->FragmentProgram.Current);
 158 #endif
 159
 160    /* XXX probably move this stuff */
 161 #if FEATURE_ATI_fragment_shader
 162    if (ctx->ATIFragmentShader.Current) {
 163       ctx->ATIFragmentShader.Current->RefCount--;
 164       if (ctx->ATIFragmentShader.Current->RefCount <= 0) {
 165          free(ctx->ATIFragmentShader.Current);
 166       }
 167    }
 168    ctx->ATIFragmentShader.Current = (struct ati_fragment_shader *) ctx->Shared->DefaultFragmentShader;
 169    assert(ctx->ATIFragmentShader.Current);
 170    ctx->ATIFragmentShader.Current->RefCount++;
 171 #endif
 172 }
 173
 174
 175 /**
 176  * Set the vertex/fragment program error state (position and error string).
 177  * This is generally called from within the parsers.
 178  */
 179 void
 180 _mesa_set_program_error(GLcontext *ctx, GLint pos, const char *string)
 181 {
 182    ctx->Program.ErrorPos = pos;
 183    free((void *) ctx->Program.ErrorString);
 184    if (!string)
 185       string = "";
 186    ctx->Program.ErrorString = _mesa_strdup(string);
 187 }
 188
 189
 190 /**
 191  * Find the line number and column for 'pos' within 'string'.
 192  * Return a copy of the line which contains 'pos'.  Free the line with
 193  * free().
 194  * \param string  the program string
 195  * \param pos     the position within the string
 196  * \param line    returns the line number corresponding to 'pos'.
 197  * \param col     returns the column number corresponding to 'pos'.
 198  * \return copy of the line containing 'pos'.
 199  */
 200 const GLubyte *
 201 _mesa_find_line_column(const GLubyte *string, const GLubyte *pos,
 202                        GLint *line, GLint *col)
 203 {
 204    const GLubyte *lineStart = string;
 205    const GLubyte *p = string;
 206    GLubyte *s;
 207    int len;
 208
 209    *line = 1;
 210
 211    while (p != pos) {
 212       if (*p == (GLubyte) '\n') {
 213          (*line)++;
 214          lineStart = p + 1;
 215       }
 216       p++;
 217    }
 218
 219    *col = (pos - lineStart) + 1;
 220
 221    /* return copy of this line */
 222    while (*p != 0 && *p != '\n')
 223       p++;
 224    len = p - lineStart;
 225    s = (GLubyte *) malloc(len + 1);
 226    memcpy(s, lineStart, len);
 227    s[len] = 0;
 228
 229    return s;
 230 }
 231
 232
 233 /**
 234  * Initialize a new vertex/fragment program object.
 235  */
 236 static struct gl_program *
 237 _mesa_init_program_struct( GLcontext *ctx, struct gl_program *prog,
 238                            GLenum target, GLuint id)
 239 {
 240    (void) ctx;
 241    if (prog) {
 242       GLuint i;
 243       memset(prog, 0, sizeof(*prog));
 244       prog->Id = id;
 245       prog->Target = target;
 246       prog->Resident = GL_TRUE;
 247       prog->RefCount = 1;
 248       prog->Format = GL_PROGRAM_FORMAT_ASCII_ARB;
 249
 250       /* default mapping from samplers to texture units */
 251       for (i = 0; i < MAX_SAMPLERS; i++)
 252          prog->SamplerUnits[i] = i;
 253    }
 254
 255    return prog;
 256 }
 257
 258
 259 /**
 260  * Initialize a new fragment program object.
 261  */
 262 struct gl_program *
 263 _mesa_init_fragment_program( GLcontext *ctx, struct gl_fragment_program *prog,
 264                              GLenum target, GLuint id)
 265 {
 266    if (prog)
 267       return _mesa_init_program_struct( ctx, &prog->Base, target, id );
 268    else
 269       return NULL;
 270 }
 271
 272
 273 /**
 274  * Initialize a new vertex program object.
 275  */
 276 struct gl_program *
 277 _mesa_init_vertex_program( GLcontext *ctx, struct gl_vertex_program *prog,
 278                            GLenum target, GLuint id)
 279 {
 280    if (prog)
 281       return _mesa_init_program_struct( ctx, &prog->Base, target, id );
 282    else
 283       return NULL;
 284 }
 285
 286
 287 /**
 288  * Allocate and initialize a new fragment/vertex program object but
 289  * don't put it into the program hash table.  Called via
 290  * ctx->Driver.NewProgram.  May be overridden (ie. replaced) by a
 291  * device driver function to implement OO deriviation with additional
 292  * types not understood by this function.
 293  *
 294  * \param ctx  context
 295  * \param id   program id/number
 296  * \param target  program target/type
 297  * \return  pointer to new program object
 298  */
 299 struct gl_program *
 300 _mesa_new_program(GLcontext *ctx, GLenum target, GLuint id)
 301 {
 302    struct gl_program *prog;
 303    switch (target) {
 304    case GL_VERTEX_PROGRAM_ARB: /* == GL_VERTEX_PROGRAM_NV */
 305    case GL_VERTEX_STATE_PROGRAM_NV:
 306       prog = _mesa_init_vertex_program(ctx, CALLOC_STRUCT(gl_vertex_program),
 307                                        target, id );
 308       break;
 309    case GL_FRAGMENT_PROGRAM_NV:
 310    case GL_FRAGMENT_PROGRAM_ARB:
 311       prog =_mesa_init_fragment_program(ctx,
 312                                          CALLOC_STRUCT(gl_fragment_program),
 313                                          target, id );
 314       break;
 315    default:
 316       _mesa_problem(ctx, "bad target in _mesa_new_program");
 317       prog = NULL;
 318    }
 319    return prog;
 320 }
 321
 322
 323 /**
 324  * Delete a program and remove it from the hash table, ignoring the
 325  * reference count.
 326  * Called via ctx->Driver.DeleteProgram.  May be wrapped (OO deriviation)
 327  * by a device driver function.
 328  */
 329 void
 330 _mesa_delete_program(GLcontext *ctx, struct gl_program *prog)
 331 {
 332    (void) ctx;
 333    ASSERT(prog);
 334    ASSERT(prog->RefCount==0);
 335
 336    if (prog == &_mesa_DummyProgram)
 337       return;
 338
 339    if (prog->String)
 340       free(prog->String);
 341
 342    _mesa_free_instructions(prog->Instructions, prog->NumInstructions);
 343
 344    if (prog->Parameters) {
 345       _mesa_free_parameter_list(prog->Parameters);
 346    }
 347    if (prog->Varying) {
 348       _mesa_free_parameter_list(prog->Varying);
 349    }
 350    if (prog->Attributes) {
 351       _mesa_free_parameter_list(prog->Attributes);
 352    }
 353
 354    free(prog);
 355 }
 356
 357
 358 /**
 359  * Return the gl_program object for a given ID.
 360  * Basically just a wrapper for _mesa_HashLookup() to avoid a lot of
 361  * casts elsewhere.
 362  */
 363 struct gl_program *
 364 _mesa_lookup_program(GLcontext *ctx, GLuint id)
 365 {
 366    if (id)
 367       return (struct gl_program *) _mesa_HashLookup(ctx->Shared->Programs, id);
 368    else
 369       return NULL;
 370 }
 371
 372
 373 /**
 374  * Reference counting for vertex/fragment programs
 375  */
 376 void
 377 _mesa_reference_program(GLcontext *ctx,
 378                         struct gl_program **ptr,
 379                         struct gl_program *prog)
 380 {
 381    assert(ptr);
 382    if (*ptr && prog) {
 383       /* sanity check */
 384       if ((*ptr)->Target == GL_VERTEX_PROGRAM_ARB)
 385          ASSERT(prog->Target == GL_VERTEX_PROGRAM_ARB);
 386       else if ((*ptr)->Target == GL_FRAGMENT_PROGRAM_ARB)
 387          ASSERT(prog->Target == GL_FRAGMENT_PROGRAM_ARB ||
 388                 prog->Target == GL_FRAGMENT_PROGRAM_NV);
 389    }
 390    if (*ptr == prog) {
 391       return;  /* no change */
 392    }
 393    if (*ptr) {
 394       GLboolean deleteFlag;
 395
 396       /*_glthread_LOCK_MUTEX((*ptr)->Mutex);*/
 397 #if 0
 398       printf("Program %p ID=%u Target=%s  Refcount-- to %d\n",
 399              *ptr, (*ptr)->Id,
 400              ((*ptr)->Target == GL_VERTEX_PROGRAM_ARB ? "VP" : "FP"),
 401              (*ptr)->RefCount - 1);
 402 #endif
 403       ASSERT((*ptr)->RefCount > 0);
 404       (*ptr)->RefCount--;
 405
 406       deleteFlag = ((*ptr)->RefCount == 0);
 407       /*_glthread_UNLOCK_MUTEX((*ptr)->Mutex);*/
 408
 409       if (deleteFlag) {
 410          ASSERT(ctx);
 411          ctx->Driver.DeleteProgram(ctx, *ptr);
 412       }
 413
 414       *ptr = NULL;
 415    }
 416
 417    assert(!*ptr);
 418    if (prog) {
 419       /*_glthread_LOCK_MUTEX(prog->Mutex);*/
 420       prog->RefCount++;
 421 #if 0
 422       printf("Program %p ID=%u Target=%s  Refcount++ to %d\n",
 423              prog, prog->Id,
 424              (prog->Target == GL_VERTEX_PROGRAM_ARB ? "VP" : "FP"),
 425              prog->RefCount);
 426 #endif
 427       /*_glthread_UNLOCK_MUTEX(prog->Mutex);*/
 428    }
 429
 430    *ptr = prog;
 431 }
 432
 433
 434 /**
 435  * Return a copy of a program.
 436  * XXX Problem here if the program object is actually OO-derivation
 437  * made by a device driver.
 438  */
 439 struct gl_program *
 440 _mesa_clone_program(GLcontext *ctx, const struct gl_program *prog)
 441 {
 442    struct gl_program *clone;
 443
 444    clone = ctx->Driver.NewProgram(ctx, prog->Target, prog->Id);
 445    if (!clone)
 446       return NULL;
 447
 448    assert(clone->Target == prog->Target);
 449    assert(clone->RefCount == 1);
 450
 451    clone->String = (GLubyte *) _mesa_strdup((char *) prog->String);
 452    clone->Format = prog->Format;
 453    clone->Instructions = _mesa_alloc_instructions(prog->NumInstructions);
 454    if (!clone->Instructions) {
 455       _mesa_reference_program(ctx, &clone, NULL);
 456       return NULL;
 457    }
 458    _mesa_copy_instructions(clone->Instructions, prog->Instructions,
 459                            prog->NumInstructions);
 460    clone->InputsRead = prog->InputsRead;
 461    clone->OutputsWritten = prog->OutputsWritten;
 462    clone->SamplersUsed = prog->SamplersUsed;
 463    clone->ShadowSamplers = prog->ShadowSamplers;
 464    memcpy(clone->TexturesUsed, prog->TexturesUsed, sizeof(prog->TexturesUsed));
 465
 466    if (prog->Parameters)
 467       clone->Parameters = _mesa_clone_parameter_list(prog->Parameters);
 468    memcpy(clone->LocalParams, prog->LocalParams, sizeof(clone->LocalParams));
 469    if (prog->Varying)
 470       clone->Varying = _mesa_clone_parameter_list(prog->Varying);
 471    if (prog->Attributes)
 472       clone->Attributes = _mesa_clone_parameter_list(prog->Attributes);
 473    memcpy(clone->LocalParams, prog->LocalParams, sizeof(clone->LocalParams));
 474    clone->NumInstructions = prog->NumInstructions;
 475    clone->NumTemporaries = prog->NumTemporaries;
 476    clone->NumParameters = prog->NumParameters;
 477    clone->NumAttributes = prog->NumAttributes;
 478    clone->NumAddressRegs = prog->NumAddressRegs;
 479    clone->NumNativeInstructions = prog->NumNativeInstructions;
 480    clone->NumNativeTemporaries = prog->NumNativeTemporaries;
 481    clone->NumNativeParameters = prog->NumNativeParameters;
 482    clone->NumNativeAttributes = prog->NumNativeAttributes;
 483    clone->NumNativeAddressRegs = prog->NumNativeAddressRegs;
 484    clone->NumAluInstructions = prog->NumAluInstructions;
 485    clone->NumTexInstructions = prog->NumTexInstructions;
 486    clone->NumTexIndirections = prog->NumTexIndirections;
 487    clone->NumNativeAluInstructions = prog->NumNativeAluInstructions;
 488    clone->NumNativeTexInstructions = prog->NumNativeTexInstructions;
 489    clone->NumNativeTexIndirections = prog->NumNativeTexIndirections;
 490
 491    switch (prog->Target) {
 492    case GL_VERTEX_PROGRAM_ARB:
 493       {
 494          const struct gl_vertex_program *vp
 495             = (const struct gl_vertex_program *) prog;
 496          struct gl_vertex_program *vpc = (struct gl_vertex_program *) clone;
 497          vpc->IsPositionInvariant = vp->IsPositionInvariant;
 498          vpc->IsNVProgram = vp->IsNVProgram;
 499       }
 500       break;
 501    case GL_FRAGMENT_PROGRAM_ARB:
 502       {
 503          const struct gl_fragment_program *fp
 504             = (const struct gl_fragment_program *) prog;
 505          struct gl_fragment_program *fpc = (struct gl_fragment_program *) clone;
 506          fpc->FogOption = fp->FogOption;
 507          fpc->UsesKill = fp->UsesKill;
 508          fpc->OriginUpperLeft = fp->OriginUpperLeft;
 509          fpc->PixelCenterInteger = fp->PixelCenterInteger;
 510       }
 511       break;
 512    default:
 513       _mesa_problem(NULL, "Unexpected target in _mesa_clone_program");
 514    }
 515
 516    return clone;
 517 }
 518
 519
 520 /**
 521  * Insert 'count' NOP instructions at 'start' in the given program.
 522  * Adjust branch targets accordingly.
 523  */
 524 GLboolean
 525 _mesa_insert_instructions(struct gl_program *prog, GLuint start, GLuint count)
 526 {
 527    const GLuint origLen = prog->NumInstructions;
 528    const GLuint newLen = origLen + count;
 529    struct prog_instruction *newInst;
 530    GLuint i;
 531
 532    /* adjust branches */
 533    for (i = 0; i < prog->NumInstructions; i++) {
 534       struct prog_instruction *inst = prog->Instructions + i;
 535       if (inst->BranchTarget > 0) {
 536          if ((GLuint)inst->BranchTarget >= start) {
 537             inst->BranchTarget += count;
 538          }
 539       }
 540    }
 541
 542    /* Alloc storage for new instructions */
 543    newInst = _mesa_alloc_instructions(newLen);
 544    if (!newInst) {
 545       return GL_FALSE;
 546    }
 547
 548    /* Copy 'start' instructions into new instruction buffer */
 549    _mesa_copy_instructions(newInst, prog->Instructions, start);
 550
 551    /* init the new instructions */
 552    _mesa_init_instructions(newInst + start, count);
 553
 554    /* Copy the remaining/tail instructions to new inst buffer */
 555    _mesa_copy_instructions(newInst + start + count,
 556                            prog->Instructions + start,
 557                            origLen - start);
 558
 559    /* free old instructions */
 560    _mesa_free_instructions(prog->Instructions, origLen);
 561
 562    /* install new instructions */
 563    prog->Instructions = newInst;
 564    prog->NumInstructions = newLen;
 565
 566    return GL_TRUE;
 567 }
 568
 569 /**
 570  * Delete 'count' instructions at 'start' in the given program.
 571  * Adjust branch targets accordingly.
 572  */
 573 GLboolean
 574 _mesa_delete_instructions(struct gl_program *prog, GLuint start, GLuint count)
 575 {
 576    const GLuint origLen = prog->NumInstructions;
 577    const GLuint newLen = origLen - count;
 578    struct prog_instruction *newInst;
 579    GLuint i;
 580
 581    /* adjust branches */
 582    for (i = 0; i < prog->NumInstructions; i++) {
 583       struct prog_instruction *inst = prog->Instructions + i;
 584       if (inst->BranchTarget > 0) {
 585          if (inst->BranchTarget > (GLint) start) {
 586             inst->BranchTarget -= count;
 587          }
 588       }
 589    }
 590
 591    /* Alloc storage for new instructions */
 592    newInst = _mesa_alloc_instructions(newLen);
 593    if (!newInst) {
 594       return GL_FALSE;
 595    }
 596
 597    /* Copy 'start' instructions into new instruction buffer */
 598    _mesa_copy_instructions(newInst, prog->Instructions, start);
 599
 600    /* Copy the remaining/tail instructions to new inst buffer */
 601    _mesa_copy_instructions(newInst + start,
 602                            prog->Instructions + start + count,
 603                            newLen - start);
 604
 605    /* free old instructions */
 606    _mesa_free_instructions(prog->Instructions, origLen);
 607
 608    /* install new instructions */
 609    prog->Instructions = newInst;
 610    prog->NumInstructions = newLen;
 611
 612    return GL_TRUE;
 613 }
 614
 615
 616 /**
 617  * Search instructions for registers that match (oldFile, oldIndex),
 618  * replacing them with (newFile, newIndex).
 619  */
 620 static void
 621 replace_registers(struct prog_instruction *inst, GLuint numInst,
 622                   GLuint oldFile, GLuint oldIndex,
 623                   GLuint newFile, GLuint newIndex)
 624 {
 625    GLuint i, j;
 626    for (i = 0; i < numInst; i++) {
 627       /* src regs */
 628       for (j = 0; j < _mesa_num_inst_src_regs(inst->Opcode); j++) {
 629          if (inst[i].SrcReg[j].File == oldFile &&
 630              inst[i].SrcReg[j].Index == oldIndex) {
 631             inst[i].SrcReg[j].File = newFile;
 632             inst[i].SrcReg[j].Index = newIndex;
 633          }
 634       }
 635       /* dst reg */
 636       if (inst[i].DstReg.File == oldFile && inst[i].DstReg.Index == oldIndex) {
 637          inst[i].DstReg.File = newFile;
 638          inst[i].DstReg.Index = newIndex;
 639       }
 640    }
 641 }
 642
 643
 644 /**
 645  * Search instructions for references to program parameters.  When found,
 646  * increment the parameter index by 'offset'.
 647  * Used when combining programs.
 648  */
 649 static void
 650 adjust_param_indexes(struct prog_instruction *inst, GLuint numInst,
 651                      GLuint offset)
 652 {
 653    GLuint i, j;
 654    for (i = 0; i < numInst; i++) {
 655       for (j = 0; j < _mesa_num_inst_src_regs(inst->Opcode); j++) {
 656          GLuint f = inst[i].SrcReg[j].File;
 657          if (f == PROGRAM_CONSTANT ||
 658              f == PROGRAM_UNIFORM ||
 659              f == PROGRAM_STATE_VAR) {
 660             inst[i].SrcReg[j].Index += offset;
 661          }
 662       }
 663    }
 664 }
 665
 666
 667 /**
 668  * Combine two programs into one.  Fix instructions so the outputs of
 669  * the first program go to the inputs of the second program.
 670  */
 671 struct gl_program *
 672 _mesa_combine_programs(GLcontext *ctx,
 673                        const struct gl_program *progA,
 674                        const struct gl_program *progB)
 675 {
 676    struct prog_instruction *newInst;
 677    struct gl_program *newProg;
 678    const GLuint lenA = progA->NumInstructions - 1; /* omit END instr */
 679    const GLuint lenB = progB->NumInstructions;
 680    const GLuint numParamsA = _mesa_num_parameters(progA->Parameters);
 681    const GLuint newLength = lenA + lenB;
 682    GLboolean usedTemps[MAX_PROGRAM_TEMPS];
 683    GLuint firstTemp = 0;
 684    GLbitfield inputsB;
 685    GLuint i;
 686
 687    ASSERT(progA->Target == progB->Target);
 688
 689    newInst = _mesa_alloc_instructions(newLength);
 690    if (!newInst)
 691       return GL_FALSE;
 692
 693    _mesa_copy_instructions(newInst, progA->Instructions, lenA);
 694    _mesa_copy_instructions(newInst + lenA, progB->Instructions, lenB);
 695
 696    /* adjust branch / instruction addresses for B's instructions */
 697    for (i = 0; i < lenB; i++) {
 698       newInst[lenA + i].BranchTarget += lenA;
 699    }
 700
 701    newProg = ctx->Driver.NewProgram(ctx, progA->Target, 0);
 702    newProg->Instructions = newInst;
 703    newProg->NumInstructions = newLength;
 704
 705    /* find used temp regs (we may need new temps below) */
 706    _mesa_find_used_registers(newProg, PROGRAM_TEMPORARY,
 707                              usedTemps, MAX_PROGRAM_TEMPS);
 708
 709    if (newProg->Target == GL_FRAGMENT_PROGRAM_ARB) {
 710       struct gl_fragment_program *fprogA, *fprogB, *newFprog;
 711       GLbitfield progB_inputsRead = progB->InputsRead;
 712       GLint progB_colorFile, progB_colorIndex;
 713
 714       fprogA = (struct gl_fragment_program *) progA;
 715       fprogB = (struct gl_fragment_program *) progB;
 716       newFprog = (struct gl_fragment_program *) newProg;
 717
 718       newFprog->UsesKill = fprogA->UsesKill || fprogB->UsesKill;
 719
 720       /* We'll do a search and replace for instances
 721        * of progB_colorFile/progB_colorIndex below...
 722        */
 723       progB_colorFile = PROGRAM_INPUT;
 724       progB_colorIndex = FRAG_ATTRIB_COL0;
 725
 726       /*
 727        * The fragment program may get color from a state var rather than
 728        * a fragment input (vertex output) if it's constant.
 729        * See the texenvprogram.c code.
 730        * So, search the program's parameter list now to see if the program
 731        * gets color from a state var instead of a conventional fragment
 732        * input register.
 733        */
 734       for (i = 0; i < progB->Parameters->NumParameters; i++) {
 735          struct gl_program_parameter *p = &progB->Parameters->Parameters[i];
 736          if (p->Type == PROGRAM_STATE_VAR &&
 737              p->StateIndexes[0] == STATE_INTERNAL &&
 738              p->StateIndexes[1] == STATE_CURRENT_ATTRIB &&
 739              p->StateIndexes[2] == VERT_ATTRIB_COLOR0) {
 740             progB_inputsRead |= FRAG_BIT_COL0;
 741             progB_colorFile = PROGRAM_STATE_VAR;
 742             progB_colorIndex = i;
 743             break;
 744          }
 745       }
 746
 747       /* Connect color outputs of fprogA to color inputs of fprogB, via a
 748        * new temporary register.
 749        */
 750       if ((progA->OutputsWritten & (1 << FRAG_RESULT_COLOR)) &&
 751           (progB_inputsRead & FRAG_BIT_COL0)) {
 752          GLint tempReg = _mesa_find_free_register(usedTemps, MAX_PROGRAM_TEMPS,
 753                                                   firstTemp);
 754          if (tempReg < 0) {
 755             _mesa_problem(ctx, "No free temp regs found in "
 756                           "_mesa_combine_programs(), using 31");
 757             tempReg = 31;
 758          }
 759          firstTemp = tempReg + 1;
 760
 761          /* replace writes to result.color[0] with tempReg */
 762          replace_registers(newInst, lenA,
 763                            PROGRAM_OUTPUT, FRAG_RESULT_COLOR,
 764                            PROGRAM_TEMPORARY, tempReg);
 765          /* replace reads from the input color with tempReg */
 766          replace_registers(newInst + lenA, lenB,
 767                            progB_colorFile, progB_colorIndex, /* search for */
 768                            PROGRAM_TEMPORARY, tempReg  /* replace with */ );
 769       }
 770
 771       /* compute combined program's InputsRead */
 772       inputsB = progB_inputsRead;
 773       if (progA->OutputsWritten & (1 << FRAG_RESULT_COLOR)) {
 774          inputsB &= ~(1 << FRAG_ATTRIB_COL0);
 775       }
 776       newProg->InputsRead = progA->InputsRead | inputsB;
 777       newProg->OutputsWritten = progB->OutputsWritten;
 778       newProg->SamplersUsed = progA->SamplersUsed | progB->SamplersUsed;
 779    }
 780    else {
 781       /* vertex program */
 782       assert(0);      /* XXX todo */
 783    }
 784
 785    /*
 786     * Merge parameters (uniforms, constants, etc)
 787     */
 788    newProg->Parameters = _mesa_combine_parameter_lists(progA->Parameters,
 789                                                        progB->Parameters);
 790
 791    adjust_param_indexes(newInst + lenA, lenB, numParamsA);
 792
 793
 794    return newProg;
 795 }
 796
 797
 798 /**
 799  * Populate the 'used' array with flags indicating which registers (TEMPs,
 800  * INPUTs, OUTPUTs, etc, are used by the given program.
 801  * \param file  type of register to scan for
 802  * \param used  returns true/false flags for in use / free
 803  * \param usedSize  size of the 'used' array
 804  */
 805 void
 806 _mesa_find_used_registers(const struct gl_program *prog,
 807                           gl_register_file file,
 808                           GLboolean used[], GLuint usedSize)
 809 {
 810    GLuint i, j;
 811
 812    memset(used, 0, usedSize);
 813
 814    for (i = 0; i < prog->NumInstructions; i++) {
 815       const struct prog_instruction *inst = prog->Instructions + i;
 816       const GLuint n = _mesa_num_inst_src_regs(inst->Opcode);
 817
 818       if (inst->DstReg.File == file) {
 819          used[inst->DstReg.Index] = GL_TRUE;
 820       }
 821
 822       for (j = 0; j < n; j++) {
 823          if (inst->SrcReg[j].File == file) {
 824             used[inst->SrcReg[j].Index] = GL_TRUE;
 825          }
 826       }
 827    }
 828 }
 829
 830
 831 /**
 832  * Scan the given 'used' register flag array for the first entry
 833  * that's >= firstReg.
 834  * \param used  vector of flags indicating registers in use (as returned
 835  *              by _mesa_find_used_registers())
 836  * \param usedSize  size of the 'used' array
 837  * \param firstReg  first register to start searching at
 838  * \return index of unused register, or -1 if none.
 839  */
 840 GLint
 841 _mesa_find_free_register(const GLboolean used[],
 842                          GLuint usedSize, GLuint firstReg)
 843 {
 844    GLuint i;
 845
 846    assert(firstReg < usedSize);
 847
 848    for (i = firstReg; i < usedSize; i++)
 849       if (!used[i])
 850          return i;
 851
 852    return -1;
 853 }
 854
 855
 856 /**
 857  * "Post-process" a GPU program.  This is intended to be used for debugging.
 858  * Example actions include no-op'ing instructions or changing instruction
 859  * behaviour.
 860  */
 861 void
 862 _mesa_postprocess_program(GLcontext *ctx, struct gl_program *prog)
 863 {
 864    static const GLfloat white[4] = { 0.5, 0.5, 0.5, 0.5 };
 865    GLuint i;
 866    GLuint whiteSwizzle;
 867    GLint whiteIndex = _mesa_add_unnamed_constant(prog->Parameters,
 868                                                  white, 4, &whiteSwizzle);
 869
 870    (void) whiteIndex;
 871
 872    for (i = 0; i < prog->NumInstructions; i++) {
 873       struct prog_instruction *inst = prog->Instructions + i;
 874       const GLuint n = _mesa_num_inst_src_regs(inst->Opcode);
 875
 876       (void) n;
 877
 878       if (_mesa_is_tex_instruction(inst->Opcode)) {
 879 #if 0
 880          /* replace TEX/TXP/TXB with MOV */
 881          inst->Opcode = OPCODE_MOV;
 882          inst->DstReg.WriteMask = WRITEMASK_XYZW;
 883          inst->SrcReg[0].Swizzle = SWIZZLE_XYZW;
 884          inst->SrcReg[0].Negate = NEGATE_NONE;
 885 #endif
 886
 887 #if 0
 888          /* disable shadow texture mode */
 889          inst->TexShadow = 0;
 890 #endif
 891       }
 892
 893       if (inst->Opcode == OPCODE_TXP) {
 894 #if 0
 895          inst->Opcode = OPCODE_MOV;
 896          inst->DstReg.WriteMask = WRITEMASK_XYZW;
 897          inst->SrcReg[0].File = PROGRAM_CONSTANT;
 898          inst->SrcReg[0].Index = whiteIndex;
 899          inst->SrcReg[0].Swizzle = SWIZZLE_XYZW;
 900          inst->SrcReg[0].Negate = NEGATE_NONE;
 901 #endif
 902 #if 0
 903          inst->TexShadow = 0;
 904 #endif
 905 #if 0
 906          inst->Opcode = OPCODE_TEX;
 907          inst->TexShadow = 0;
 908 #endif
 909       }
 910
 911    }
 912 }