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    ctx->Program.ErrorPos = -1;
  57    ctx->Program.ErrorString = _mesa_strdup("");
  58
  59 #if FEATURE_NV_vertex_program || FEATURE_ARB_vertex_program
  60    ctx->VertexProgram.Enabled = GL_FALSE;
  61    ctx->VertexProgram.PointSizeEnabled = GL_FALSE;
  62    ctx->VertexProgram.TwoSideEnabled = GL_FALSE;
  63    _mesa_reference_vertprog(ctx, &ctx->VertexProgram.Current,
  64                             ctx->Shared->DefaultVertexProgram);
  65    assert(ctx->VertexProgram.Current);
  66    for (i = 0; i < MAX_NV_VERTEX_PROGRAM_PARAMS / 4; i++) {
  67       ctx->VertexProgram.TrackMatrix[i] = GL_NONE;
  68       ctx->VertexProgram.TrackMatrixTransform[i] = GL_IDENTITY_NV;
  69    }
  70    ctx->VertexProgram.Cache = _mesa_new_program_cache();
  71 #endif
  72
  73 #if FEATURE_NV_fragment_program || FEATURE_ARB_fragment_program
  74    ctx->FragmentProgram.Enabled = GL_FALSE;
  75    _mesa_reference_fragprog(ctx, &ctx->FragmentProgram.Current,
  76                             ctx->Shared->DefaultFragmentProgram);
  77    assert(ctx->FragmentProgram.Current);
  78    ctx->FragmentProgram.Cache = _mesa_new_program_cache();
  79 #endif
  80
  81
  82    /* XXX probably move this stuff */
  83 #if FEATURE_ATI_fragment_shader
  84    ctx->ATIFragmentShader.Enabled = GL_FALSE;
  85    ctx->ATIFragmentShader.Current = ctx->Shared->DefaultFragmentShader;
  86    assert(ctx->ATIFragmentShader.Current);
  87    ctx->ATIFragmentShader.Current->RefCount++;
  88 #endif
  89 }
  90
  91
  92 /**
  93  * Free a context's vertex/fragment program state
  94  */
  95 void
  96 _mesa_free_program_data(GLcontext *ctx)
  97 {
  98 #if FEATURE_NV_vertex_program || FEATURE_ARB_vertex_program
  99    _mesa_reference_vertprog(ctx, &ctx->VertexProgram.Current, NULL);
 100    _mesa_delete_program_cache(ctx, ctx->VertexProgram.Cache);
 101 #endif
 102 #if FEATURE_NV_fragment_program || FEATURE_ARB_fragment_program
 103    _mesa_reference_fragprog(ctx, &ctx->FragmentProgram.Current, NULL);
 104    _mesa_delete_program_cache(ctx, ctx->FragmentProgram.Cache);
 105 #endif
 106    /* XXX probably move this stuff */
 107 #if FEATURE_ATI_fragment_shader
 108    if (ctx->ATIFragmentShader.Current) {
 109       ctx->ATIFragmentShader.Current->RefCount--;
 110       if (ctx->ATIFragmentShader.Current->RefCount <= 0) {
 111          _mesa_free(ctx->ATIFragmentShader.Current);
 112       }
 113    }
 114 #endif
 115    _mesa_free((void *) ctx->Program.ErrorString);
 116 }
 117
 118
 119 /**
 120  * Update the default program objects in the given context to reference those
 121  * specified in the shared state and release those referencing the old
 122  * shared state.
 123  */
 124 void
 125 _mesa_update_default_objects_program(GLcontext *ctx)
 126 {
 127 #if FEATURE_NV_vertex_program || FEATURE_ARB_vertex_program
 128    _mesa_reference_vertprog(ctx, &ctx->VertexProgram.Current,
 129                             (struct gl_vertex_program *)
 130                             ctx->Shared->DefaultVertexProgram);
 131    assert(ctx->VertexProgram.Current);
 132 #endif
 133
 134 #if FEATURE_NV_fragment_program || FEATURE_ARB_fragment_program
 135    _mesa_reference_fragprog(ctx, &ctx->FragmentProgram.Current,
 136                             (struct gl_fragment_program *)
 137                             ctx->Shared->DefaultFragmentProgram);
 138    assert(ctx->FragmentProgram.Current);
 139 #endif
 140
 141    /* XXX probably move this stuff */
 142 #if FEATURE_ATI_fragment_shader
 143    if (ctx->ATIFragmentShader.Current) {
 144       ctx->ATIFragmentShader.Current->RefCount--;
 145       if (ctx->ATIFragmentShader.Current->RefCount <= 0) {
 146          _mesa_free(ctx->ATIFragmentShader.Current);
 147       }
 148    }
 149    ctx->ATIFragmentShader.Current = (struct ati_fragment_shader *) ctx->Shared->DefaultFragmentShader;
 150    assert(ctx->ATIFragmentShader.Current);
 151    ctx->ATIFragmentShader.Current->RefCount++;
 152 #endif
 153 }
 154
 155
 156 /**
 157  * Set the vertex/fragment program error state (position and error string).
 158  * This is generally called from within the parsers.
 159  */
 160 void
 161 _mesa_set_program_error(GLcontext *ctx, GLint pos, const char *string)
 162 {
 163    ctx->Program.ErrorPos = pos;
 164    _mesa_free((void *) ctx->Program.ErrorString);
 165    if (!string)
 166       string = "";
 167    ctx->Program.ErrorString = _mesa_strdup(string);
 168 }
 169
 170
 171 /**
 172  * Find the line number and column for 'pos' within 'string'.
 173  * Return a copy of the line which contains 'pos'.  Free the line with
 174  * _mesa_free().
 175  * \param string  the program string
 176  * \param pos     the position within the string
 177  * \param line    returns the line number corresponding to 'pos'.
 178  * \param col     returns the column number corresponding to 'pos'.
 179  * \return copy of the line containing 'pos'.
 180  */
 181 const GLubyte *
 182 _mesa_find_line_column(const GLubyte *string, const GLubyte *pos,
 183                        GLint *line, GLint *col)
 184 {
 185    const GLubyte *lineStart = string;
 186    const GLubyte *p = string;
 187    GLubyte *s;
 188    int len;
 189
 190    *line = 1;
 191
 192    while (p != pos) {
 193       if (*p == (GLubyte) '\n') {
 194          (*line)++;
 195          lineStart = p + 1;
 196       }
 197       p++;
 198    }
 199
 200    *col = (pos - lineStart) + 1;
 201
 202    /* return copy of this line */
 203    while (*p != 0 && *p != '\n')
 204       p++;
 205    len = p - lineStart;
 206    s = (GLubyte *) _mesa_malloc(len + 1);
 207    _mesa_memcpy(s, lineStart, len);
 208    s[len] = 0;
 209
 210    return s;
 211 }
 212
 213
 214 /**
 215  * Initialize a new vertex/fragment program object.
 216  */
 217 static struct gl_program *
 218 _mesa_init_program_struct( GLcontext *ctx, struct gl_program *prog,
 219                            GLenum target, GLuint id)
 220 {
 221    (void) ctx;
 222    if (prog) {
 223       GLuint i;
 224       _mesa_bzero(prog, sizeof(*prog));
 225       prog->Id = id;
 226       prog->Target = target;
 227       prog->Resident = GL_TRUE;
 228       prog->RefCount = 1;
 229       prog->Format = GL_PROGRAM_FORMAT_ASCII_ARB;
 230
 231       /* default mapping from samplers to texture units */
 232       for (i = 0; i < MAX_SAMPLERS; i++)
 233          prog->SamplerUnits[i] = i;
 234    }
 235
 236    return prog;
 237 }
 238
 239
 240 /**
 241  * Initialize a new fragment program object.
 242  */
 243 struct gl_program *
 244 _mesa_init_fragment_program( GLcontext *ctx, struct gl_fragment_program *prog,
 245                              GLenum target, GLuint id)
 246 {
 247    if (prog)
 248       return _mesa_init_program_struct( ctx, &prog->Base, target, id );
 249    else
 250       return NULL;
 251 }
 252
 253
 254 /**
 255  * Initialize a new vertex program object.
 256  */
 257 struct gl_program *
 258 _mesa_init_vertex_program( GLcontext *ctx, struct gl_vertex_program *prog,
 259                            GLenum target, GLuint id)
 260 {
 261    if (prog)
 262       return _mesa_init_program_struct( ctx, &prog->Base, target, id );
 263    else
 264       return NULL;
 265 }
 266
 267
 268 /**
 269  * Allocate and initialize a new fragment/vertex program object but
 270  * don't put it into the program hash table.  Called via
 271  * ctx->Driver.NewProgram.  May be overridden (ie. replaced) by a
 272  * device driver function to implement OO deriviation with additional
 273  * types not understood by this function.
 274  *
 275  * \param ctx  context
 276  * \param id   program id/number
 277  * \param target  program target/type
 278  * \return  pointer to new program object
 279  */
 280 struct gl_program *
 281 _mesa_new_program(GLcontext *ctx, GLenum target, GLuint id)
 282 {
 283    struct gl_program *prog;
 284    switch (target) {
 285    case GL_VERTEX_PROGRAM_ARB: /* == GL_VERTEX_PROGRAM_NV */
 286       prog = _mesa_init_vertex_program(ctx, CALLOC_STRUCT(gl_vertex_program),
 287                                        target, id );
 288       break;
 289    case GL_FRAGMENT_PROGRAM_NV:
 290    case GL_FRAGMENT_PROGRAM_ARB:
 291       prog =_mesa_init_fragment_program(ctx,
 292                                          CALLOC_STRUCT(gl_fragment_program),
 293                                          target, id );
 294       break;
 295    default:
 296       _mesa_problem(ctx, "bad target in _mesa_new_program");
 297       prog = NULL;
 298    }
 299    return prog;
 300 }
 301
 302
 303 /**
 304  * Delete a program and remove it from the hash table, ignoring the
 305  * reference count.
 306  * Called via ctx->Driver.DeleteProgram.  May be wrapped (OO deriviation)
 307  * by a device driver function.
 308  */
 309 void
 310 _mesa_delete_program(GLcontext *ctx, struct gl_program *prog)
 311 {
 312    (void) ctx;
 313    ASSERT(prog);
 314    ASSERT(prog->RefCount==0);
 315
 316    if (prog == &_mesa_DummyProgram)
 317       return;
 318
 319    if (prog->String)
 320       _mesa_free(prog->String);
 321
 322    _mesa_free_instructions(prog->Instructions, prog->NumInstructions);
 323
 324    if (prog->Parameters) {
 325       _mesa_free_parameter_list(prog->Parameters);
 326    }
 327    if (prog->Varying) {
 328       _mesa_free_parameter_list(prog->Varying);
 329    }
 330    if (prog->Attributes) {
 331       _mesa_free_parameter_list(prog->Attributes);
 332    }
 333
 334    /* XXX this is a little ugly */
 335    if (prog->Target == GL_VERTEX_PROGRAM_ARB) {
 336       struct gl_vertex_program *vprog = (struct gl_vertex_program *) prog;
 337       if (vprog->TnlData)
 338          _mesa_free(vprog->TnlData);
 339    }
 340
 341    _mesa_free(prog);
 342 }
 343
 344
 345 /**
 346  * Return the gl_program object for a given ID.
 347  * Basically just a wrapper for _mesa_HashLookup() to avoid a lot of
 348  * casts elsewhere.
 349  */
 350 struct gl_program *
 351 _mesa_lookup_program(GLcontext *ctx, GLuint id)
 352 {
 353    if (id)
 354       return (struct gl_program *) _mesa_HashLookup(ctx->Shared->Programs, id);
 355    else
 356       return NULL;
 357 }
 358
 359
 360 /**
 361  * Reference counting for vertex/fragment programs
 362  */
 363 void
 364 _mesa_reference_program(GLcontext *ctx,
 365                         struct gl_program **ptr,
 366                         struct gl_program *prog)
 367 {
 368    assert(ptr);
 369    if (*ptr && prog) {
 370       /* sanity check */
 371       ASSERT((*ptr)->Target == prog->Target);
 372    }
 373    if (*ptr == prog) {
 374       return;  /* no change */
 375    }
 376    if (*ptr) {
 377       GLboolean deleteFlag;
 378
 379       /*_glthread_LOCK_MUTEX((*ptr)->Mutex);*/
 380 #if 0
 381       printf("Program %p ID=%u Target=%s  Refcount-- to %d\n",
 382              *ptr, (*ptr)->Id,
 383              ((*ptr)->Target == GL_VERTEX_PROGRAM_ARB ? "VP" : "FP"),
 384              (*ptr)->RefCount - 1);
 385 #endif
 386       ASSERT((*ptr)->RefCount > 0);
 387       (*ptr)->RefCount--;
 388
 389       deleteFlag = ((*ptr)->RefCount == 0);
 390       /*_glthread_UNLOCK_MUTEX((*ptr)->Mutex);*/
 391
 392       if (deleteFlag) {
 393          ASSERT(ctx);
 394          ctx->Driver.DeleteProgram(ctx, *ptr);
 395       }
 396
 397       *ptr = NULL;
 398    }
 399
 400    assert(!*ptr);
 401    if (prog) {
 402       /*_glthread_LOCK_MUTEX(prog->Mutex);*/
 403       prog->RefCount++;
 404 #if 0
 405       printf("Program %p ID=%u Target=%s  Refcount++ to %d\n",
 406              prog, prog->Id,
 407              (prog->Target == GL_VERTEX_PROGRAM_ARB ? "VP" : "FP"),
 408              prog->RefCount);
 409 #endif
 410       /*_glthread_UNLOCK_MUTEX(prog->Mutex);*/
 411    }
 412
 413    *ptr = prog;
 414 }
 415
 416
 417 /**
 418  * Return a copy of a program.
 419  * XXX Problem here if the program object is actually OO-derivation
 420  * made by a device driver.
 421  */
 422 struct gl_program *
 423 _mesa_clone_program(GLcontext *ctx, const struct gl_program *prog)
 424 {
 425    struct gl_program *clone;
 426
 427    clone = ctx->Driver.NewProgram(ctx, prog->Target, prog->Id);
 428    if (!clone)
 429       return NULL;
 430
 431    assert(clone->Target == prog->Target);
 432    assert(clone->RefCount == 1);
 433
 434    clone->String = (GLubyte *) _mesa_strdup((char *) prog->String);
 435    clone->Format = prog->Format;
 436    clone->Instructions = _mesa_alloc_instructions(prog->NumInstructions);
 437    if (!clone->Instructions) {
 438       _mesa_reference_program(ctx, &clone, NULL);
 439       return NULL;
 440    }
 441    _mesa_copy_instructions(clone->Instructions, prog->Instructions,
 442                            prog->NumInstructions);
 443    clone->InputsRead = prog->InputsRead;
 444    clone->OutputsWritten = prog->OutputsWritten;
 445    clone->SamplersUsed = prog->SamplersUsed;
 446    clone->ShadowSamplers = prog->ShadowSamplers;
 447    memcpy(clone->TexturesUsed, prog->TexturesUsed, sizeof(prog->TexturesUsed));
 448
 449    if (prog->Parameters)
 450       clone->Parameters = _mesa_clone_parameter_list(prog->Parameters);
 451    memcpy(clone->LocalParams, prog->LocalParams, sizeof(clone->LocalParams));
 452    if (prog->Varying)
 453       clone->Varying = _mesa_clone_parameter_list(prog->Varying);
 454    if (prog->Attributes)
 455       clone->Attributes = _mesa_clone_parameter_list(prog->Attributes);
 456    memcpy(clone->LocalParams, prog->LocalParams, sizeof(clone->LocalParams));
 457    clone->NumInstructions = prog->NumInstructions;
 458    clone->NumTemporaries = prog->NumTemporaries;
 459    clone->NumParameters = prog->NumParameters;
 460    clone->NumAttributes = prog->NumAttributes;
 461    clone->NumAddressRegs = prog->NumAddressRegs;
 462    clone->NumNativeInstructions = prog->NumNativeInstructions;
 463    clone->NumNativeTemporaries = prog->NumNativeTemporaries;
 464    clone->NumNativeParameters = prog->NumNativeParameters;
 465    clone->NumNativeAttributes = prog->NumNativeAttributes;
 466    clone->NumNativeAddressRegs = prog->NumNativeAddressRegs;
 467    clone->NumAluInstructions = prog->NumAluInstructions;
 468    clone->NumTexInstructions = prog->NumTexInstructions;
 469    clone->NumTexIndirections = prog->NumTexIndirections;
 470    clone->NumNativeAluInstructions = prog->NumNativeAluInstructions;
 471    clone->NumNativeTexInstructions = prog->NumNativeTexInstructions;
 472    clone->NumNativeTexIndirections = prog->NumNativeTexIndirections;
 473
 474    switch (prog->Target) {
 475    case GL_VERTEX_PROGRAM_ARB:
 476       {
 477          const struct gl_vertex_program *vp
 478             = (const struct gl_vertex_program *) prog;
 479          struct gl_vertex_program *vpc = (struct gl_vertex_program *) clone;
 480          vpc->IsPositionInvariant = vp->IsPositionInvariant;
 481       }
 482       break;
 483    case GL_FRAGMENT_PROGRAM_ARB:
 484       {
 485          const struct gl_fragment_program *fp
 486             = (const struct gl_fragment_program *) prog;
 487          struct gl_fragment_program *fpc = (struct gl_fragment_program *) clone;
 488          fpc->FogOption = fp->FogOption;
 489          fpc->UsesKill = fp->UsesKill;
 490       }
 491       break;
 492    default:
 493       _mesa_problem(NULL, "Unexpected target in _mesa_clone_program");
 494    }
 495
 496    return clone;
 497 }
 498
 499
 500 /**
 501  * Insert 'count' NOP instructions at 'start' in the given program.
 502  * Adjust branch targets accordingly.
 503  */
 504 GLboolean
 505 _mesa_insert_instructions(struct gl_program *prog, GLuint start, GLuint count)
 506 {
 507    const GLuint origLen = prog->NumInstructions;
 508    const GLuint newLen = origLen + count;
 509    struct prog_instruction *newInst;
 510    GLuint i;
 511
 512    /* adjust branches */
 513    for (i = 0; i < prog->NumInstructions; i++) {
 514       struct prog_instruction *inst = prog->Instructions + i;
 515       if (inst->BranchTarget > 0) {
 516          if (inst->BranchTarget >= start) {
 517             inst->BranchTarget += count;
 518          }
 519       }
 520    }
 521
 522    /* Alloc storage for new instructions */
 523    newInst = _mesa_alloc_instructions(newLen);
 524    if (!newInst) {
 525       return GL_FALSE;
 526    }
 527
 528    /* Copy 'start' instructions into new instruction buffer */
 529    _mesa_copy_instructions(newInst, prog->Instructions, start);
 530
 531    /* init the new instructions */
 532    _mesa_init_instructions(newInst + start, count);
 533
 534    /* Copy the remaining/tail instructions to new inst buffer */
 535    _mesa_copy_instructions(newInst + start + count,
 536                            prog->Instructions + start,
 537                            origLen - start);
 538
 539    /* free old instructions */
 540    _mesa_free_instructions(prog->Instructions, origLen);
 541
 542    /* install new instructions */
 543    prog->Instructions = newInst;
 544    prog->NumInstructions = newLen;
 545
 546    return GL_TRUE;
 547 }
 548
 549
 550 /**
 551  * Delete 'count' instructions at 'start' in the given program.
 552  * Adjust branch targets accordingly.
 553  */
 554 GLboolean
 555 _mesa_delete_instructions(struct gl_program *prog, GLuint start, GLuint count)
 556 {
 557    const GLuint origLen = prog->NumInstructions;
 558    const GLuint newLen = origLen - count;
 559    struct prog_instruction *newInst;
 560    GLuint i;
 561
 562    /* adjust branches */
 563    for (i = 0; i < prog->NumInstructions; i++) {
 564       struct prog_instruction *inst = prog->Instructions + i;
 565       if (inst->BranchTarget > 0) {
 566          if (inst->BranchTarget >= start) {
 567             inst->BranchTarget -= count;
 568          }
 569       }
 570    }
 571
 572    /* Alloc storage for new instructions */
 573    newInst = _mesa_alloc_instructions(newLen);
 574    if (!newInst) {
 575       return GL_FALSE;
 576    }
 577
 578    /* Copy 'start' instructions into new instruction buffer */
 579    _mesa_copy_instructions(newInst, prog->Instructions, start);
 580
 581    /* Copy the remaining/tail instructions to new inst buffer */
 582    _mesa_copy_instructions(newInst + start,
 583                            prog->Instructions + start + count,
 584                            newLen - start);
 585
 586    /* free old instructions */
 587    _mesa_free_instructions(prog->Instructions, origLen);
 588
 589    /* install new instructions */
 590    prog->Instructions = newInst;
 591    prog->NumInstructions = newLen;
 592
 593    return GL_TRUE;
 594 }
 595
 596
 597 /**
 598  * Search instructions for registers that match (oldFile, oldIndex),
 599  * replacing them with (newFile, newIndex).
 600  */
 601 static void
 602 replace_registers(struct prog_instruction *inst, GLuint numInst,
 603                   GLuint oldFile, GLuint oldIndex,
 604                   GLuint newFile, GLuint newIndex)
 605 {
 606    GLuint i, j;
 607    for (i = 0; i < numInst; i++) {
 608       /* src regs */
 609       for (j = 0; j < _mesa_num_inst_src_regs(inst->Opcode); j++) {
 610          if (inst[i].SrcReg[j].File == oldFile &&
 611              inst[i].SrcReg[j].Index == oldIndex) {
 612             inst[i].SrcReg[j].File = newFile;
 613             inst[i].SrcReg[j].Index = newIndex;
 614          }
 615       }
 616       /* dst reg */
 617       if (inst[i].DstReg.File == oldFile && inst[i].DstReg.Index == oldIndex) {
 618          inst[i].DstReg.File = newFile;
 619          inst[i].DstReg.Index = newIndex;
 620       }
 621    }
 622 }
 623
 624
 625 /**
 626  * Search instructions for references to program parameters.  When found,
 627  * increment the parameter index by 'offset'.
 628  * Used when combining programs.
 629  */
 630 static void
 631 adjust_param_indexes(struct prog_instruction *inst, GLuint numInst,
 632                      GLuint offset)
 633 {
 634    GLuint i, j;
 635    for (i = 0; i < numInst; i++) {
 636       for (j = 0; j < _mesa_num_inst_src_regs(inst->Opcode); j++) {
 637          GLuint f = inst[i].SrcReg[j].File;
 638          if (f == PROGRAM_CONSTANT ||
 639              f == PROGRAM_UNIFORM ||
 640              f == PROGRAM_STATE_VAR) {
 641             inst[i].SrcReg[j].Index += offset;
 642          }
 643       }
 644    }
 645 }
 646
 647
 648 /**
 649  * Combine two programs into one.  Fix instructions so the outputs of
 650  * the first program go to the inputs of the second program.
 651  */
 652 struct gl_program *
 653 _mesa_combine_programs(GLcontext *ctx,
 654                        const struct gl_program *progA,
 655                        const struct gl_program *progB)
 656 {
 657    struct prog_instruction *newInst;
 658    struct gl_program *newProg;
 659    const GLuint lenA = progA->NumInstructions - 1; /* omit END instr */
 660    const GLuint lenB = progB->NumInstructions;
 661    const GLuint numParamsA = _mesa_num_parameters(progA->Parameters);
 662    const GLuint newLength = lenA + lenB;
 663    GLbitfield inputsB;
 664    GLuint i;
 665
 666    ASSERT(progA->Target == progB->Target);
 667
 668    newInst = _mesa_alloc_instructions(newLength);
 669    if (!newInst)
 670       return GL_FALSE;
 671
 672    _mesa_copy_instructions(newInst, progA->Instructions, lenA);
 673    _mesa_copy_instructions(newInst + lenA, progB->Instructions, lenB);
 674
 675    /* adjust branch / instruction addresses for B's instructions */
 676    for (i = 0; i < lenB; i++) {
 677       newInst[lenA + i].BranchTarget += lenA;
 678    }
 679
 680    newProg = ctx->Driver.NewProgram(ctx, progA->Target, 0);
 681    newProg->Instructions = newInst;
 682    newProg->NumInstructions = newLength;
 683
 684    if (newProg->Target == GL_FRAGMENT_PROGRAM_ARB) {
 685       struct gl_fragment_program *fprogA, *fprogB, *newFprog;
 686       fprogA = (struct gl_fragment_program *) progA;
 687       fprogB = (struct gl_fragment_program *) progB;
 688       newFprog = (struct gl_fragment_program *) newProg;
 689
 690       newFprog->UsesKill = fprogA->UsesKill || fprogB->UsesKill;
 691
 692       /* Connect color outputs of fprogA to color inputs of fprogB, via a
 693        * new temporary register.
 694        */
 695       if ((progA->OutputsWritten & (1 << FRAG_RESULT_COLR)) &&
 696           (progB->InputsRead & (1 << FRAG_ATTRIB_COL0))) {
 697          GLint tempReg = _mesa_find_free_register(newProg, PROGRAM_TEMPORARY);
 698          if (tempReg < 0) {
 699             _mesa_problem(ctx, "No free temp regs found in "
 700                           "_mesa_combine_programs(), using 31");
 701             tempReg = 31;
 702          }
 703          /* replace writes to result.color[0] with tempReg */
 704          replace_registers(newInst, lenA,
 705                            PROGRAM_OUTPUT, FRAG_RESULT_COLR,
 706                            PROGRAM_TEMPORARY, tempReg);
 707          /* replace reads from input.color[0] with tempReg */
 708          replace_registers(newInst + lenA, lenB,
 709                            PROGRAM_INPUT, FRAG_ATTRIB_COL0,
 710                            PROGRAM_TEMPORARY, tempReg);
 711       }
 712
 713       inputsB = progB->InputsRead;
 714       if (progA->OutputsWritten & (1 << FRAG_RESULT_COLR)) {
 715          inputsB &= ~(1 << FRAG_ATTRIB_COL0);
 716       }
 717       newProg->InputsRead = progA->InputsRead | inputsB;
 718       newProg->OutputsWritten = progB->OutputsWritten;
 719       newProg->SamplersUsed = progA->SamplersUsed | progB->SamplersUsed;
 720    }
 721    else {
 722       /* vertex program */
 723       assert(0);      /* XXX todo */
 724    }
 725
 726    /*
 727     * Merge parameters (uniforms, constants, etc)
 728     */
 729    newProg->Parameters = _mesa_combine_parameter_lists(progA->Parameters,
 730                                                        progB->Parameters);
 731
 732    adjust_param_indexes(newInst + lenA, lenB, numParamsA);
 733
 734
 735    return newProg;
 736 }
 737
 738
 739
 740
 741 /**
 742  * Scan the given program to find a free register of the given type.
 743  * \param regFile - PROGRAM_INPUT, PROGRAM_OUTPUT or PROGRAM_TEMPORARY
 744  */
 745 GLint
 746 _mesa_find_free_register(const struct gl_program *prog, GLuint regFile)
 747 {
 748    GLboolean used[MAX_PROGRAM_TEMPS];
 749    GLuint i, k;
 750
 751    assert(regFile == PROGRAM_INPUT ||
 752           regFile == PROGRAM_OUTPUT ||
 753           regFile == PROGRAM_TEMPORARY);
 754
 755    _mesa_memset(used, 0, sizeof(used));
 756
 757    for (i = 0; i < prog->NumInstructions; i++) {
 758       const struct prog_instruction *inst = prog->Instructions + i;
 759       const GLuint n = _mesa_num_inst_src_regs(inst->Opcode);
 760
 761       for (k = 0; k < n; k++) {
 762          if (inst->SrcReg[k].File == regFile) {
 763             used[inst->SrcReg[k].Index] = GL_TRUE;
 764          }
 765       }
 766    }
 767
 768    for (i = 0; i < MAX_PROGRAM_TEMPS; i++) {
 769       if (!used[i])
 770          return i;
 771    }
 772
 773    return -1;
 774 }