src/mesa/program/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 =
  78       (ctx->API == API_OPENGLES2) ? GL_TRUE : GL_FALSE;
  79 #else
  80    ctx->VertexProgram.PointSizeEnabled = GL_FALSE;
  81 #endif
  82    ctx->VertexProgram.TwoSideEnabled = GL_FALSE;
  83    _mesa_reference_vertprog(ctx, &ctx->VertexProgram.Current,
  84                             ctx->Shared->DefaultVertexProgram);
  85    assert(ctx->VertexProgram.Current);
  86    for (i = 0; i < MAX_NV_VERTEX_PROGRAM_PARAMS / 4; i++) {
  87       ctx->VertexProgram.TrackMatrix[i] = GL_NONE;
  88       ctx->VertexProgram.TrackMatrixTransform[i] = GL_IDENTITY_NV;
  89    }
  90    ctx->VertexProgram.Cache = _mesa_new_program_cache();
  91 #endif
  92
  93 #if FEATURE_NV_fragment_program || FEATURE_ARB_fragment_program
  94    ctx->FragmentProgram.Enabled = GL_FALSE;
  95    _mesa_reference_fragprog(ctx, &ctx->FragmentProgram.Current,
  96                             ctx->Shared->DefaultFragmentProgram);
  97    assert(ctx->FragmentProgram.Current);
  98    ctx->FragmentProgram.Cache = _mesa_new_program_cache();
  99 #endif
 100
 101
 102    /* XXX probably move this stuff */
 103 #if FEATURE_ATI_fragment_shader
 104    ctx->ATIFragmentShader.Enabled = GL_FALSE;
 105    ctx->ATIFragmentShader.Current = ctx->Shared->DefaultFragmentShader;
 106    assert(ctx->ATIFragmentShader.Current);
 107    ctx->ATIFragmentShader.Current->RefCount++;
 108 #endif
 109 }
 110
 111
 112 /**
 113  * Free a context's vertex/fragment program state
 114  */
 115 void
 116 _mesa_free_program_data(GLcontext *ctx)
 117 {
 118 #if FEATURE_NV_vertex_program || FEATURE_ARB_vertex_program
 119    _mesa_reference_vertprog(ctx, &ctx->VertexProgram.Current, NULL);
 120    _mesa_delete_program_cache(ctx, ctx->VertexProgram.Cache);
 121 #endif
 122 #if FEATURE_NV_fragment_program || FEATURE_ARB_fragment_program
 123    _mesa_reference_fragprog(ctx, &ctx->FragmentProgram.Current, NULL);
 124    _mesa_delete_program_cache(ctx, ctx->FragmentProgram.Cache);
 125 #endif
 126    /* XXX probably move this stuff */
 127 #if FEATURE_ATI_fragment_shader
 128    if (ctx->ATIFragmentShader.Current) {
 129       ctx->ATIFragmentShader.Current->RefCount--;
 130       if (ctx->ATIFragmentShader.Current->RefCount <= 0) {
 131          free(ctx->ATIFragmentShader.Current);
 132       }
 133    }
 134 #endif
 135    free((void *) ctx->Program.ErrorString);
 136 }
 137
 138
 139 /**
 140  * Update the default program objects in the given context to reference those
 141  * specified in the shared state and release those referencing the old
 142  * shared state.
 143  */
 144 void
 145 _mesa_update_default_objects_program(GLcontext *ctx)
 146 {
 147 #if FEATURE_NV_vertex_program || FEATURE_ARB_vertex_program
 148    _mesa_reference_vertprog(ctx, &ctx->VertexProgram.Current,
 149                             (struct gl_vertex_program *)
 150                             ctx->Shared->DefaultVertexProgram);
 151    assert(ctx->VertexProgram.Current);
 152 #endif
 153
 154 #if FEATURE_NV_fragment_program || FEATURE_ARB_fragment_program
 155    _mesa_reference_fragprog(ctx, &ctx->FragmentProgram.Current,
 156                             (struct gl_fragment_program *)
 157                             ctx->Shared->DefaultFragmentProgram);
 158    assert(ctx->FragmentProgram.Current);
 159 #endif
 160
 161    /* XXX probably move this stuff */
 162 #if FEATURE_ATI_fragment_shader
 163    if (ctx->ATIFragmentShader.Current) {
 164       ctx->ATIFragmentShader.Current->RefCount--;
 165       if (ctx->ATIFragmentShader.Current->RefCount <= 0) {
 166          free(ctx->ATIFragmentShader.Current);
 167       }
 168    }
 169    ctx->ATIFragmentShader.Current = (struct ati_fragment_shader *) ctx->Shared->DefaultFragmentShader;
 170    assert(ctx->ATIFragmentShader.Current);
 171    ctx->ATIFragmentShader.Current->RefCount++;
 172 #endif
 173 }
 174
 175
 176 /**
 177  * Set the vertex/fragment program error state (position and error string).
 178  * This is generally called from within the parsers.
 179  */
 180 void
 181 _mesa_set_program_error(GLcontext *ctx, GLint pos, const char *string)
 182 {
 183    ctx->Program.ErrorPos = pos;
 184    free((void *) ctx->Program.ErrorString);
 185    if (!string)
 186       string = "";
 187    ctx->Program.ErrorString = _mesa_strdup(string);
 188 }
 189
 190
 191 /**
 192  * Find the line number and column for 'pos' within 'string'.
 193  * Return a copy of the line which contains 'pos'.  Free the line with
 194  * free().
 195  * \param string  the program string
 196  * \param pos     the position within the string
 197  * \param line    returns the line number corresponding to 'pos'.
 198  * \param col     returns the column number corresponding to 'pos'.
 199  * \return copy of the line containing 'pos'.
 200  */
 201 const GLubyte *
 202 _mesa_find_line_column(const GLubyte *string, const GLubyte *pos,
 203                        GLint *line, GLint *col)
 204 {
 205    const GLubyte *lineStart = string;
 206    const GLubyte *p = string;
 207    GLubyte *s;
 208    int len;
 209
 210    *line = 1;
 211
 212    while (p != pos) {
 213       if (*p == (GLubyte) '\n') {
 214          (*line)++;
 215          lineStart = p + 1;
 216       }
 217       p++;
 218    }
 219
 220    *col = (pos - lineStart) + 1;
 221
 222    /* return copy of this line */
 223    while (*p != 0 && *p != '\n')
 224       p++;
 225    len = p - lineStart;
 226    s = (GLubyte *) malloc(len + 1);
 227    memcpy(s, lineStart, len);
 228    s[len] = 0;
 229
 230    return s;
 231 }
 232
 233
 234 /**
 235  * Initialize a new vertex/fragment program object.
 236  */
 237 static struct gl_program *
 238 _mesa_init_program_struct( GLcontext *ctx, struct gl_program *prog,
 239                            GLenum target, GLuint id)
 240 {
 241    (void) ctx;
 242    if (prog) {
 243       GLuint i;
 244       memset(prog, 0, sizeof(*prog));
 245       prog->Id = id;
 246       prog->Target = target;
 247       prog->Resident = GL_TRUE;
 248       prog->RefCount = 1;
 249       prog->Format = GL_PROGRAM_FORMAT_ASCII_ARB;
 250
 251       /* default mapping from samplers to texture units */
 252       for (i = 0; i < MAX_SAMPLERS; i++)
 253          prog->SamplerUnits[i] = i;
 254    }
 255
 256    return prog;
 257 }
 258
 259
 260 /**
 261  * Initialize a new fragment program object.
 262  */
 263 struct gl_program *
 264 _mesa_init_fragment_program( GLcontext *ctx, struct gl_fragment_program *prog,
 265                              GLenum target, GLuint id)
 266 {
 267    if (prog)
 268       return _mesa_init_program_struct( ctx, &prog->Base, target, id );
 269    else
 270       return NULL;
 271 }
 272
 273
 274 /**
 275  * Initialize a new vertex program object.
 276  */
 277 struct gl_program *
 278 _mesa_init_vertex_program( GLcontext *ctx, struct gl_vertex_program *prog,
 279                            GLenum target, GLuint id)
 280 {
 281    if (prog)
 282       return _mesa_init_program_struct( ctx, &prog->Base, target, id );
 283    else
 284       return NULL;
 285 }
 286
 287
 288 /**
 289  * Allocate and initialize a new fragment/vertex program object but
 290  * don't put it into the program hash table.  Called via
 291  * ctx->Driver.NewProgram.  May be overridden (ie. replaced) by a
 292  * device driver function to implement OO deriviation with additional
 293  * types not understood by this function.
 294  *
 295  * \param ctx  context
 296  * \param id   program id/number
 297  * \param target  program target/type
 298  * \return  pointer to new program object
 299  */
 300 struct gl_program *
 301 _mesa_new_program(GLcontext *ctx, GLenum target, GLuint id)
 302 {
 303    struct gl_program *prog;
 304    switch (target) {
 305    case GL_VERTEX_PROGRAM_ARB: /* == GL_VERTEX_PROGRAM_NV */
 306    case GL_VERTEX_STATE_PROGRAM_NV:
 307       prog = _mesa_init_vertex_program(ctx, CALLOC_STRUCT(gl_vertex_program),
 308                                        target, id );
 309       break;
 310    case GL_FRAGMENT_PROGRAM_NV:
 311    case GL_FRAGMENT_PROGRAM_ARB:
 312       prog =_mesa_init_fragment_program(ctx,
 313                                          CALLOC_STRUCT(gl_fragment_program),
 314                                          target, id );
 315       break;
 316    default:
 317       _mesa_problem(ctx, "bad target in _mesa_new_program");
 318       prog = NULL;
 319    }
 320    return prog;
 321 }
 322
 323
 324 /**
 325  * Delete a program and remove it from the hash table, ignoring the
 326  * reference count.
 327  * Called via ctx->Driver.DeleteProgram.  May be wrapped (OO deriviation)
 328  * by a device driver function.
 329  */
 330 void
 331 _mesa_delete_program(GLcontext *ctx, struct gl_program *prog)
 332 {
 333    (void) ctx;
 334    ASSERT(prog);
 335    ASSERT(prog->RefCount==0);
 336
 337    if (prog == &_mesa_DummyProgram)
 338       return;
 339
 340    if (prog->String)
 341       free(prog->String);
 342
 343    _mesa_free_instructions(prog->Instructions, prog->NumInstructions);
 344
 345    if (prog->Parameters) {
 346       _mesa_free_parameter_list(prog->Parameters);
 347    }
 348    if (prog->Varying) {
 349       _mesa_free_parameter_list(prog->Varying);
 350    }
 351    if (prog->Attributes) {
 352       _mesa_free_parameter_list(prog->Attributes);
 353    }
 354
 355    free(prog);
 356 }
 357
 358
 359 /**
 360  * Return the gl_program object for a given ID.
 361  * Basically just a wrapper for _mesa_HashLookup() to avoid a lot of
 362  * casts elsewhere.
 363  */
 364 struct gl_program *
 365 _mesa_lookup_program(GLcontext *ctx, GLuint id)
 366 {
 367    if (id)
 368       return (struct gl_program *) _mesa_HashLookup(ctx->Shared->Programs, id);
 369    else
 370       return NULL;
 371 }
 372
 373
 374 /**
 375  * Reference counting for vertex/fragment programs
 376  */
 377 void
 378 _mesa_reference_program(GLcontext *ctx,
 379                         struct gl_program **ptr,
 380                         struct gl_program *prog)
 381 {
 382    assert(ptr);
 383    if (*ptr && prog) {
 384       /* sanity check */
 385       if ((*ptr)->Target == GL_VERTEX_PROGRAM_ARB)
 386          ASSERT(prog->Target == GL_VERTEX_PROGRAM_ARB);
 387       else if ((*ptr)->Target == GL_FRAGMENT_PROGRAM_ARB)
 388          ASSERT(prog->Target == GL_FRAGMENT_PROGRAM_ARB ||
 389                 prog->Target == GL_FRAGMENT_PROGRAM_NV);
 390    }
 391    if (*ptr == prog) {
 392       return;  /* no change */
 393    }
 394    if (*ptr) {
 395       GLboolean deleteFlag;
 396
 397       /*_glthread_LOCK_MUTEX((*ptr)->Mutex);*/
 398 #if 0
 399       printf("Program %p ID=%u Target=%s  Refcount-- to %d\n",
 400              *ptr, (*ptr)->Id,
 401              ((*ptr)->Target == GL_VERTEX_PROGRAM_ARB ? "VP" : "FP"),
 402              (*ptr)->RefCount - 1);
 403 #endif
 404       ASSERT((*ptr)->RefCount > 0);
 405       (*ptr)->RefCount--;
 406
 407       deleteFlag = ((*ptr)->RefCount == 0);
 408       /*_glthread_UNLOCK_MUTEX((*ptr)->Mutex);*/
 409
 410       if (deleteFlag) {
 411          ASSERT(ctx);
 412          ctx->Driver.DeleteProgram(ctx, *ptr);
 413       }
 414
 415       *ptr = NULL;
 416    }
 417
 418    assert(!*ptr);
 419    if (prog) {
 420       /*_glthread_LOCK_MUTEX(prog->Mutex);*/
 421       prog->RefCount++;
 422 #if 0
 423       printf("Program %p ID=%u Target=%s  Refcount++ to %d\n",
 424              prog, prog->Id,
 425              (prog->Target == GL_VERTEX_PROGRAM_ARB ? "VP" : "FP"),
 426              prog->RefCount);
 427 #endif
 428       /*_glthread_UNLOCK_MUTEX(prog->Mutex);*/
 429    }
 430
 431    *ptr = prog;
 432 }
 433
 434
 435 /**
 436  * Return a copy of a program.
 437  * XXX Problem here if the program object is actually OO-derivation
 438  * made by a device driver.
 439  */
 440 struct gl_program *
 441 _mesa_clone_program(GLcontext *ctx, const struct gl_program *prog)
 442 {
 443    struct gl_program *clone;
 444
 445    clone = ctx->Driver.NewProgram(ctx, prog->Target, prog->Id);
 446    if (!clone)
 447       return NULL;
 448
 449    assert(clone->Target == prog->Target);
 450    assert(clone->RefCount == 1);
 451
 452    clone->String = (GLubyte *) _mesa_strdup((char *) prog->String);
 453    clone->Format = prog->Format;
 454    clone->Instructions = _mesa_alloc_instructions(prog->NumInstructions);
 455    if (!clone->Instructions) {
 456       _mesa_reference_program(ctx, &clone, NULL);
 457       return NULL;
 458    }
 459    _mesa_copy_instructions(clone->Instructions, prog->Instructions,
 460                            prog->NumInstructions);
 461    clone->InputsRead = prog->InputsRead;
 462    clone->OutputsWritten = prog->OutputsWritten;
 463    clone->SamplersUsed = prog->SamplersUsed;
 464    clone->ShadowSamplers = prog->ShadowSamplers;
 465    memcpy(clone->TexturesUsed, prog->TexturesUsed, sizeof(prog->TexturesUsed));
 466
 467    if (prog->Parameters)
 468       clone->Parameters = _mesa_clone_parameter_list(prog->Parameters);
 469    memcpy(clone->LocalParams, prog->LocalParams, sizeof(clone->LocalParams));
 470    if (prog->Varying)
 471       clone->Varying = _mesa_clone_parameter_list(prog->Varying);
 472    if (prog->Attributes)
 473       clone->Attributes = _mesa_clone_parameter_list(prog->Attributes);
 474    memcpy(clone->LocalParams, prog->LocalParams, sizeof(clone->LocalParams));
 475    clone->NumInstructions = prog->NumInstructions;
 476    clone->NumTemporaries = prog->NumTemporaries;
 477    clone->NumParameters = prog->NumParameters;
 478    clone->NumAttributes = prog->NumAttributes;
 479    clone->NumAddressRegs = prog->NumAddressRegs;
 480    clone->NumNativeInstructions = prog->NumNativeInstructions;
 481    clone->NumNativeTemporaries = prog->NumNativeTemporaries;
 482    clone->NumNativeParameters = prog->NumNativeParameters;
 483    clone->NumNativeAttributes = prog->NumNativeAttributes;
 484    clone->NumNativeAddressRegs = prog->NumNativeAddressRegs;
 485    clone->NumAluInstructions = prog->NumAluInstructions;
 486    clone->NumTexInstructions = prog->NumTexInstructions;
 487    clone->NumTexIndirections = prog->NumTexIndirections;
 488    clone->NumNativeAluInstructions = prog->NumNativeAluInstructions;
 489    clone->NumNativeTexInstructions = prog->NumNativeTexInstructions;
 490    clone->NumNativeTexIndirections = prog->NumNativeTexIndirections;
 491
 492    switch (prog->Target) {
 493    case GL_VERTEX_PROGRAM_ARB:
 494       {
 495          const struct gl_vertex_program *vp
 496             = (const struct gl_vertex_program *) prog;
 497          struct gl_vertex_program *vpc = (struct gl_vertex_program *) clone;
 498          vpc->IsPositionInvariant = vp->IsPositionInvariant;
 499          vpc->IsNVProgram = vp->IsNVProgram;
 500       }
 501       break;
 502    case GL_FRAGMENT_PROGRAM_ARB:
 503       {
 504          const struct gl_fragment_program *fp
 505             = (const struct gl_fragment_program *) prog;
 506          struct gl_fragment_program *fpc = (struct gl_fragment_program *) clone;
 507          fpc->FogOption = fp->FogOption;
 508          fpc->UsesKill = fp->UsesKill;
 509          fpc->OriginUpperLeft = fp->OriginUpperLeft;
 510          fpc->PixelCenterInteger = fp->PixelCenterInteger;
 511       }
 512       break;
 513    default:
 514       _mesa_problem(NULL, "Unexpected target in _mesa_clone_program");
 515    }
 516
 517    return clone;
 518 }
 519
 520
 521 /**
 522  * Insert 'count' NOP instructions at 'start' in the given program.
 523  * Adjust branch targets accordingly.
 524  */
 525 GLboolean
 526 _mesa_insert_instructions(struct gl_program *prog, GLuint start, GLuint count)
 527 {
 528    const GLuint origLen = prog->NumInstructions;
 529    const GLuint newLen = origLen + count;
 530    struct prog_instruction *newInst;
 531    GLuint i;
 532
 533    /* adjust branches */
 534    for (i = 0; i < prog->NumInstructions; i++) {
 535       struct prog_instruction *inst = prog->Instructions + i;
 536       if (inst->BranchTarget > 0) {
 537          if ((GLuint)inst->BranchTarget >= start) {
 538             inst->BranchTarget += count;
 539          }
 540       }
 541    }
 542
 543    /* Alloc storage for new instructions */
 544    newInst = _mesa_alloc_instructions(newLen);
 545    if (!newInst) {
 546       return GL_FALSE;
 547    }
 548
 549    /* Copy 'start' instructions into new instruction buffer */
 550    _mesa_copy_instructions(newInst, prog->Instructions, start);
 551
 552    /* init the new instructions */
 553    _mesa_init_instructions(newInst + start, count);
 554
 555    /* Copy the remaining/tail instructions to new inst buffer */
 556    _mesa_copy_instructions(newInst + start + count,
 557                            prog->Instructions + start,
 558                            origLen - start);
 559
 560    /* free old instructions */
 561    _mesa_free_instructions(prog->Instructions, origLen);
 562
 563    /* install new instructions */
 564    prog->Instructions = newInst;
 565    prog->NumInstructions = newLen;
 566
 567    return GL_TRUE;
 568 }
 569
 570 /**
 571  * Delete 'count' instructions at 'start' in the given program.
 572  * Adjust branch targets accordingly.
 573  */
 574 GLboolean
 575 _mesa_delete_instructions(struct gl_program *prog, GLuint start, GLuint count)
 576 {
 577    const GLuint origLen = prog->NumInstructions;
 578    const GLuint newLen = origLen - count;
 579    struct prog_instruction *newInst;
 580    GLuint i;
 581
 582    /* adjust branches */
 583    for (i = 0; i < prog->NumInstructions; i++) {
 584       struct prog_instruction *inst = prog->Instructions + i;
 585       if (inst->BranchTarget > 0) {
 586          if (inst->BranchTarget > (GLint) start) {
 587             inst->BranchTarget -= count;
 588          }
 589       }
 590    }
 591
 592    /* Alloc storage for new instructions */
 593    newInst = _mesa_alloc_instructions(newLen);
 594    if (!newInst) {
 595       return GL_FALSE;
 596    }
 597
 598    /* Copy 'start' instructions into new instruction buffer */
 599    _mesa_copy_instructions(newInst, prog->Instructions, start);
 600
 601    /* Copy the remaining/tail instructions to new inst buffer */
 602    _mesa_copy_instructions(newInst + start,
 603                            prog->Instructions + start + count,
 604                            newLen - start);
 605
 606    /* free old instructions */
 607    _mesa_free_instructions(prog->Instructions, origLen);
 608
 609    /* install new instructions */
 610    prog->Instructions = newInst;
 611    prog->NumInstructions = newLen;
 612
 613    return GL_TRUE;
 614 }
 615
 616
 617 /**
 618  * Search instructions for registers that match (oldFile, oldIndex),
 619  * replacing them with (newFile, newIndex).
 620  */
 621 static void
 622 replace_registers(struct prog_instruction *inst, GLuint numInst,
 623                   GLuint oldFile, GLuint oldIndex,
 624                   GLuint newFile, GLuint newIndex)
 625 {
 626    GLuint i, j;
 627    for (i = 0; i < numInst; i++) {
 628       /* src regs */
 629       for (j = 0; j < _mesa_num_inst_src_regs(inst[i].Opcode); j++) {
 630          if (inst[i].SrcReg[j].File == oldFile &&
 631              inst[i].SrcReg[j].Index == oldIndex) {
 632             inst[i].SrcReg[j].File = newFile;
 633             inst[i].SrcReg[j].Index = newIndex;
 634          }
 635       }
 636       /* dst reg */
 637       if (inst[i].DstReg.File == oldFile && inst[i].DstReg.Index == oldIndex) {
 638          inst[i].DstReg.File = newFile;
 639          inst[i].DstReg.Index = newIndex;
 640       }
 641    }
 642 }
 643
 644
 645 /**
 646  * Search instructions for references to program parameters.  When found,
 647  * increment the parameter index by 'offset'.
 648  * Used when combining programs.
 649  */
 650 static void
 651 adjust_param_indexes(struct prog_instruction *inst, GLuint numInst,
 652                      GLuint offset)
 653 {
 654    GLuint i, j;
 655    for (i = 0; i < numInst; i++) {
 656       for (j = 0; j < _mesa_num_inst_src_regs(inst[i].Opcode); j++) {
 657          GLuint f = inst[i].SrcReg[j].File;
 658          if (f == PROGRAM_CONSTANT ||
 659              f == PROGRAM_UNIFORM ||
 660              f == PROGRAM_STATE_VAR) {
 661             inst[i].SrcReg[j].Index += offset;
 662          }
 663       }
 664    }
 665 }
 666
 667
 668 /**
 669  * Combine two programs into one.  Fix instructions so the outputs of
 670  * the first program go to the inputs of the second program.
 671  */
 672 struct gl_program *
 673 _mesa_combine_programs(GLcontext *ctx,
 674                        const struct gl_program *progA,
 675                        const struct gl_program *progB)
 676 {
 677    struct prog_instruction *newInst;
 678    struct gl_program *newProg;
 679    const GLuint lenA = progA->NumInstructions - 1; /* omit END instr */
 680    const GLuint lenB = progB->NumInstructions;
 681    const GLuint numParamsA = _mesa_num_parameters(progA->Parameters);
 682    const GLuint newLength = lenA + lenB;
 683    GLboolean usedTemps[MAX_PROGRAM_TEMPS];
 684    GLuint firstTemp = 0;
 685    GLbitfield inputsB;
 686    GLuint i;
 687
 688    ASSERT(progA->Target == progB->Target);
 689
 690    newInst = _mesa_alloc_instructions(newLength);
 691    if (!newInst)
 692       return GL_FALSE;
 693
 694    _mesa_copy_instructions(newInst, progA->Instructions, lenA);
 695    _mesa_copy_instructions(newInst + lenA, progB->Instructions, lenB);
 696
 697    /* adjust branch / instruction addresses for B's instructions */
 698    for (i = 0; i < lenB; i++) {
 699       newInst[lenA + i].BranchTarget += lenA;
 700    }
 701
 702    newProg = ctx->Driver.NewProgram(ctx, progA->Target, 0);
 703    newProg->Instructions = newInst;
 704    newProg->NumInstructions = newLength;
 705
 706    /* find used temp regs (we may need new temps below) */
 707    _mesa_find_used_registers(newProg, PROGRAM_TEMPORARY,
 708                              usedTemps, MAX_PROGRAM_TEMPS);
 709
 710    if (newProg->Target == GL_FRAGMENT_PROGRAM_ARB) {
 711       struct gl_fragment_program *fprogA, *fprogB, *newFprog;
 712       GLbitfield progB_inputsRead = progB->InputsRead;
 713       GLint progB_colorFile, progB_colorIndex;
 714
 715       fprogA = (struct gl_fragment_program *) progA;
 716       fprogB = (struct gl_fragment_program *) progB;
 717       newFprog = (struct gl_fragment_program *) newProg;
 718
 719       newFprog->UsesKill = fprogA->UsesKill || fprogB->UsesKill;
 720
 721       /* We'll do a search and replace for instances
 722        * of progB_colorFile/progB_colorIndex below...
 723        */
 724       progB_colorFile = PROGRAM_INPUT;
 725       progB_colorIndex = FRAG_ATTRIB_COL0;
 726
 727       /*
 728        * The fragment program may get color from a state var rather than
 729        * a fragment input (vertex output) if it's constant.
 730        * See the texenvprogram.c code.
 731        * So, search the program's parameter list now to see if the program
 732        * gets color from a state var instead of a conventional fragment
 733        * input register.
 734        */
 735       for (i = 0; i < progB->Parameters->NumParameters; i++) {
 736          struct gl_program_parameter *p = &progB->Parameters->Parameters[i];
 737          if (p->Type == PROGRAM_STATE_VAR &&
 738              p->StateIndexes[0] == STATE_INTERNAL &&
 739              p->StateIndexes[1] == STATE_CURRENT_ATTRIB &&
 740              p->StateIndexes[2] == VERT_ATTRIB_COLOR0) {
 741             progB_inputsRead |= FRAG_BIT_COL0;
 742             progB_colorFile = PROGRAM_STATE_VAR;
 743             progB_colorIndex = i;
 744             break;
 745          }
 746       }
 747
 748       /* Connect color outputs of fprogA to color inputs of fprogB, via a
 749        * new temporary register.
 750        */
 751       if ((progA->OutputsWritten & (1 << FRAG_RESULT_COLOR)) &&
 752           (progB_inputsRead & FRAG_BIT_COL0)) {
 753          GLint tempReg = _mesa_find_free_register(usedTemps, MAX_PROGRAM_TEMPS,
 754                                                   firstTemp);
 755          if (tempReg < 0) {
 756             _mesa_problem(ctx, "No free temp regs found in "
 757                           "_mesa_combine_programs(), using 31");
 758             tempReg = 31;
 759          }
 760          firstTemp = tempReg + 1;
 761
 762          /* replace writes to result.color[0] with tempReg */
 763          replace_registers(newInst, lenA,
 764                            PROGRAM_OUTPUT, FRAG_RESULT_COLOR,
 765                            PROGRAM_TEMPORARY, tempReg);
 766          /* replace reads from the input color with tempReg */
 767          replace_registers(newInst + lenA, lenB,
 768                            progB_colorFile, progB_colorIndex, /* search for */
 769                            PROGRAM_TEMPORARY, tempReg  /* replace with */ );
 770       }
 771
 772       /* compute combined program's InputsRead */
 773       inputsB = progB_inputsRead;
 774       if (progA->OutputsWritten & (1 << FRAG_RESULT_COLOR)) {
 775          inputsB &= ~(1 << FRAG_ATTRIB_COL0);
 776       }
 777       newProg->InputsRead = progA->InputsRead | inputsB;
 778       newProg->OutputsWritten = progB->OutputsWritten;
 779       newProg->SamplersUsed = progA->SamplersUsed | progB->SamplersUsed;
 780    }
 781    else {
 782       /* vertex program */
 783       assert(0);      /* XXX todo */
 784    }
 785
 786    /*
 787     * Merge parameters (uniforms, constants, etc)
 788     */
 789    newProg->Parameters = _mesa_combine_parameter_lists(progA->Parameters,
 790                                                        progB->Parameters);
 791
 792    adjust_param_indexes(newInst + lenA, lenB, numParamsA);
 793
 794
 795    return newProg;
 796 }
 797
 798
 799 /**
 800  * Populate the 'used' array with flags indicating which registers (TEMPs,
 801  * INPUTs, OUTPUTs, etc, are used by the given program.
 802  * \param file  type of register to scan for
 803  * \param used  returns true/false flags for in use / free
 804  * \param usedSize  size of the 'used' array
 805  */
 806 void
 807 _mesa_find_used_registers(const struct gl_program *prog,
 808                           gl_register_file file,
 809                           GLboolean used[], GLuint usedSize)
 810 {
 811    GLuint i, j;
 812
 813    memset(used, 0, usedSize);
 814
 815    for (i = 0; i < prog->NumInstructions; i++) {
 816       const struct prog_instruction *inst = prog->Instructions + i;
 817       const GLuint n = _mesa_num_inst_src_regs(inst->Opcode);
 818
 819       if (inst->DstReg.File == file) {
 820          used[inst->DstReg.Index] = GL_TRUE;
 821       }
 822
 823       for (j = 0; j < n; j++) {
 824          if (inst->SrcReg[j].File == file) {
 825             used[inst->SrcReg[j].Index] = GL_TRUE;
 826          }
 827       }
 828    }
 829 }
 830
 831
 832 /**
 833  * Scan the given 'used' register flag array for the first entry
 834  * that's >= firstReg.
 835  * \param used  vector of flags indicating registers in use (as returned
 836  *              by _mesa_find_used_registers())
 837  * \param usedSize  size of the 'used' array
 838  * \param firstReg  first register to start searching at
 839  * \return index of unused register, or -1 if none.
 840  */
 841 GLint
 842 _mesa_find_free_register(const GLboolean used[],
 843                          GLuint usedSize, GLuint firstReg)
 844 {
 845    GLuint i;
 846
 847    assert(firstReg < usedSize);
 848
 849    for (i = firstReg; i < usedSize; i++)
 850       if (!used[i])
 851          return i;
 852
 853    return -1;
 854 }
 855
 856
 857 /**
 858  * "Post-process" a GPU program.  This is intended to be used for debugging.
 859  * Example actions include no-op'ing instructions or changing instruction
 860  * behaviour.
 861  */
 862 void
 863 _mesa_postprocess_program(GLcontext *ctx, struct gl_program *prog)
 864 {
 865    static const GLfloat white[4] = { 0.5, 0.5, 0.5, 0.5 };
 866    GLuint i;
 867    GLuint whiteSwizzle;
 868    GLint whiteIndex = _mesa_add_unnamed_constant(prog->Parameters,
 869                                                  white, 4, &whiteSwizzle);
 870
 871    (void) whiteIndex;
 872
 873    for (i = 0; i < prog->NumInstructions; i++) {
 874       struct prog_instruction *inst = prog->Instructions + i;
 875       const GLuint n = _mesa_num_inst_src_regs(inst->Opcode);
 876
 877       (void) n;
 878
 879       if (_mesa_is_tex_instruction(inst->Opcode)) {
 880 #if 0
 881          /* replace TEX/TXP/TXB with MOV */
 882          inst->Opcode = OPCODE_MOV;
 883          inst->DstReg.WriteMask = WRITEMASK_XYZW;
 884          inst->SrcReg[0].Swizzle = SWIZZLE_XYZW;
 885          inst->SrcReg[0].Negate = NEGATE_NONE;
 886 #endif
 887
 888 #if 0
 889          /* disable shadow texture mode */
 890          inst->TexShadow = 0;
 891 #endif
 892       }
 893
 894       if (inst->Opcode == OPCODE_TXP) {
 895 #if 0
 896          inst->Opcode = OPCODE_MOV;
 897          inst->DstReg.WriteMask = WRITEMASK_XYZW;
 898          inst->SrcReg[0].File = PROGRAM_CONSTANT;
 899          inst->SrcReg[0].Index = whiteIndex;
 900          inst->SrcReg[0].Swizzle = SWIZZLE_XYZW;
 901          inst->SrcReg[0].Negate = NEGATE_NONE;
 902 #endif
 903 #if 0
 904          inst->TexShadow = 0;
 905 #endif
 906 #if 0
 907          inst->Opcode = OPCODE_TEX;
 908          inst->TexShadow = 0;
 909 #endif
 910       }
 911
 912    }
 913 }