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 #if FEATURE_es2_glsl
  62    ctx->VertexProgram.PointSizeEnabled = GL_TRUE;
  63 #else
  64    ctx->VertexProgram.PointSizeEnabled = GL_FALSE;
  65 #endif
  66    ctx->VertexProgram.TwoSideEnabled = GL_FALSE;
  67    _mesa_reference_vertprog(ctx, &ctx->VertexProgram.Current,
  68                             ctx->Shared->DefaultVertexProgram);
  69    assert(ctx->VertexProgram.Current);
  70    for (i = 0; i < MAX_NV_VERTEX_PROGRAM_PARAMS / 4; i++) {
  71       ctx->VertexProgram.TrackMatrix[i] = GL_NONE;
  72       ctx->VertexProgram.TrackMatrixTransform[i] = GL_IDENTITY_NV;
  73    }
  74    ctx->VertexProgram.Cache = _mesa_new_program_cache();
  75 #endif
  76
  77 #if FEATURE_NV_fragment_program || FEATURE_ARB_fragment_program
  78    ctx->FragmentProgram.Enabled = GL_FALSE;
  79    _mesa_reference_fragprog(ctx, &ctx->FragmentProgram.Current,
  80                             ctx->Shared->DefaultFragmentProgram);
  81    assert(ctx->FragmentProgram.Current);
  82    ctx->FragmentProgram.Cache = _mesa_new_program_cache();
  83 #endif
  84
  85
  86    /* XXX probably move this stuff */
  87 #if FEATURE_ATI_fragment_shader
  88    ctx->ATIFragmentShader.Enabled = GL_FALSE;
  89    ctx->ATIFragmentShader.Current = ctx->Shared->DefaultFragmentShader;
  90    assert(ctx->ATIFragmentShader.Current);
  91    ctx->ATIFragmentShader.Current->RefCount++;
  92 #endif
  93 }
  94
  95
  96 /**
  97  * Free a context's vertex/fragment program state
  98  */
  99 void
 100 _mesa_free_program_data(GLcontext *ctx)
 101 {
 102 #if FEATURE_NV_vertex_program || FEATURE_ARB_vertex_program
 103    _mesa_reference_vertprog(ctx, &ctx->VertexProgram.Current, NULL);
 104    _mesa_delete_program_cache(ctx, ctx->VertexProgram.Cache);
 105 #endif
 106 #if FEATURE_NV_fragment_program || FEATURE_ARB_fragment_program
 107    _mesa_reference_fragprog(ctx, &ctx->FragmentProgram.Current, NULL);
 108    _mesa_delete_program_cache(ctx, ctx->FragmentProgram.Cache);
 109 #endif
 110    /* XXX probably move this stuff */
 111 #if FEATURE_ATI_fragment_shader
 112    if (ctx->ATIFragmentShader.Current) {
 113       ctx->ATIFragmentShader.Current->RefCount--;
 114       if (ctx->ATIFragmentShader.Current->RefCount <= 0) {
 115          _mesa_free(ctx->ATIFragmentShader.Current);
 116       }
 117    }
 118 #endif
 119    _mesa_free((void *) ctx->Program.ErrorString);
 120 }
 121
 122
 123 /**
 124  * Update the default program objects in the given context to reference those
 125  * specified in the shared state and release those referencing the old
 126  * shared state.
 127  */
 128 void
 129 _mesa_update_default_objects_program(GLcontext *ctx)
 130 {
 131 #if FEATURE_NV_vertex_program || FEATURE_ARB_vertex_program
 132    _mesa_reference_vertprog(ctx, &ctx->VertexProgram.Current,
 133                             (struct gl_vertex_program *)
 134                             ctx->Shared->DefaultVertexProgram);
 135    assert(ctx->VertexProgram.Current);
 136 #endif
 137
 138 #if FEATURE_NV_fragment_program || FEATURE_ARB_fragment_program
 139    _mesa_reference_fragprog(ctx, &ctx->FragmentProgram.Current,
 140                             (struct gl_fragment_program *)
 141                             ctx->Shared->DefaultFragmentProgram);
 142    assert(ctx->FragmentProgram.Current);
 143 #endif
 144
 145    /* XXX probably move this stuff */
 146 #if FEATURE_ATI_fragment_shader
 147    if (ctx->ATIFragmentShader.Current) {
 148       ctx->ATIFragmentShader.Current->RefCount--;
 149       if (ctx->ATIFragmentShader.Current->RefCount <= 0) {
 150          _mesa_free(ctx->ATIFragmentShader.Current);
 151       }
 152    }
 153    ctx->ATIFragmentShader.Current = (struct ati_fragment_shader *) ctx->Shared->DefaultFragmentShader;
 154    assert(ctx->ATIFragmentShader.Current);
 155    ctx->ATIFragmentShader.Current->RefCount++;
 156 #endif
 157 }
 158
 159
 160 /**
 161  * Set the vertex/fragment program error state (position and error string).
 162  * This is generally called from within the parsers.
 163  */
 164 void
 165 _mesa_set_program_error(GLcontext *ctx, GLint pos, const char *string)
 166 {
 167    ctx->Program.ErrorPos = pos;
 168    _mesa_free((void *) ctx->Program.ErrorString);
 169    if (!string)
 170       string = "";
 171    ctx->Program.ErrorString = _mesa_strdup(string);
 172 }
 173
 174
 175 /**
 176  * Find the line number and column for 'pos' within 'string'.
 177  * Return a copy of the line which contains 'pos'.  Free the line with
 178  * _mesa_free().
 179  * \param string  the program string
 180  * \param pos     the position within the string
 181  * \param line    returns the line number corresponding to 'pos'.
 182  * \param col     returns the column number corresponding to 'pos'.
 183  * \return copy of the line containing 'pos'.
 184  */
 185 const GLubyte *
 186 _mesa_find_line_column(const GLubyte *string, const GLubyte *pos,
 187                        GLint *line, GLint *col)
 188 {
 189    const GLubyte *lineStart = string;
 190    const GLubyte *p = string;
 191    GLubyte *s;
 192    int len;
 193
 194    *line = 1;
 195
 196    while (p != pos) {
 197       if (*p == (GLubyte) '\n') {
 198          (*line)++;
 199          lineStart = p + 1;
 200       }
 201       p++;
 202    }
 203
 204    *col = (pos - lineStart) + 1;
 205
 206    /* return copy of this line */
 207    while (*p != 0 && *p != '\n')
 208       p++;
 209    len = p - lineStart;
 210    s = (GLubyte *) _mesa_malloc(len + 1);
 211    _mesa_memcpy(s, lineStart, len);
 212    s[len] = 0;
 213
 214    return s;
 215 }
 216
 217
 218 /**
 219  * Initialize a new vertex/fragment program object.
 220  */
 221 static struct gl_program *
 222 _mesa_init_program_struct( GLcontext *ctx, struct gl_program *prog,
 223                            GLenum target, GLuint id)
 224 {
 225    (void) ctx;
 226    if (prog) {
 227       GLuint i;
 228       _mesa_bzero(prog, sizeof(*prog));
 229       prog->Id = id;
 230       prog->Target = target;
 231       prog->Resident = GL_TRUE;
 232       prog->RefCount = 1;
 233       prog->Format = GL_PROGRAM_FORMAT_ASCII_ARB;
 234
 235       /* default mapping from samplers to texture units */
 236       for (i = 0; i < MAX_SAMPLERS; i++)
 237          prog->SamplerUnits[i] = i;
 238    }
 239
 240    return prog;
 241 }
 242
 243
 244 /**
 245  * Initialize a new fragment program object.
 246  */
 247 struct gl_program *
 248 _mesa_init_fragment_program( GLcontext *ctx, struct gl_fragment_program *prog,
 249                              GLenum target, GLuint id)
 250 {
 251    if (prog)
 252       return _mesa_init_program_struct( ctx, &prog->Base, target, id );
 253    else
 254       return NULL;
 255 }
 256
 257
 258 /**
 259  * Initialize a new vertex program object.
 260  */
 261 struct gl_program *
 262 _mesa_init_vertex_program( GLcontext *ctx, struct gl_vertex_program *prog,
 263                            GLenum target, GLuint id)
 264 {
 265    if (prog)
 266       return _mesa_init_program_struct( ctx, &prog->Base, target, id );
 267    else
 268       return NULL;
 269 }
 270
 271
 272 /**
 273  * Allocate and initialize a new fragment/vertex program object but
 274  * don't put it into the program hash table.  Called via
 275  * ctx->Driver.NewProgram.  May be overridden (ie. replaced) by a
 276  * device driver function to implement OO deriviation with additional
 277  * types not understood by this function.
 278  *
 279  * \param ctx  context
 280  * \param id   program id/number
 281  * \param target  program target/type
 282  * \return  pointer to new program object
 283  */
 284 struct gl_program *
 285 _mesa_new_program(GLcontext *ctx, GLenum target, GLuint id)
 286 {
 287    struct gl_program *prog;
 288    switch (target) {
 289    case GL_VERTEX_PROGRAM_ARB: /* == GL_VERTEX_PROGRAM_NV */
 290       prog = _mesa_init_vertex_program(ctx, CALLOC_STRUCT(gl_vertex_program),
 291                                        target, id );
 292       break;
 293    case GL_FRAGMENT_PROGRAM_NV:
 294    case GL_FRAGMENT_PROGRAM_ARB:
 295       prog =_mesa_init_fragment_program(ctx,
 296                                          CALLOC_STRUCT(gl_fragment_program),
 297                                          target, id );
 298       break;
 299    default:
 300       _mesa_problem(ctx, "bad target in _mesa_new_program");
 301       prog = NULL;
 302    }
 303    return prog;
 304 }
 305
 306
 307 /**
 308  * Delete a program and remove it from the hash table, ignoring the
 309  * reference count.
 310  * Called via ctx->Driver.DeleteProgram.  May be wrapped (OO deriviation)
 311  * by a device driver function.
 312  */
 313 void
 314 _mesa_delete_program(GLcontext *ctx, struct gl_program *prog)
 315 {
 316    (void) ctx;
 317    ASSERT(prog);
 318    ASSERT(prog->RefCount==0);
 319
 320    if (prog == &_mesa_DummyProgram)
 321       return;
 322
 323    if (prog->String)
 324       _mesa_free(prog->String);
 325
 326    _mesa_free_instructions(prog->Instructions, prog->NumInstructions);
 327
 328    if (prog->Parameters) {
 329       _mesa_free_parameter_list(prog->Parameters);
 330    }
 331    if (prog->Varying) {
 332       _mesa_free_parameter_list(prog->Varying);
 333    }
 334    if (prog->Attributes) {
 335       _mesa_free_parameter_list(prog->Attributes);
 336    }
 337
 338    /* XXX this is a little ugly */
 339    if (prog->Target == GL_VERTEX_PROGRAM_ARB) {
 340       struct gl_vertex_program *vprog = (struct gl_vertex_program *) prog;
 341       if (vprog->TnlData)
 342          _mesa_free(vprog->TnlData);
 343    }
 344
 345    _mesa_free(prog);
 346 }
 347
 348
 349 /**
 350  * Return the gl_program object for a given ID.
 351  * Basically just a wrapper for _mesa_HashLookup() to avoid a lot of
 352  * casts elsewhere.
 353  */
 354 struct gl_program *
 355 _mesa_lookup_program(GLcontext *ctx, GLuint id)
 356 {
 357    if (id)
 358       return (struct gl_program *) _mesa_HashLookup(ctx->Shared->Programs, id);
 359    else
 360       return NULL;
 361 }
 362
 363
 364 /**
 365  * Reference counting for vertex/fragment programs
 366  */
 367 void
 368 _mesa_reference_program(GLcontext *ctx,
 369                         struct gl_program **ptr,
 370                         struct gl_program *prog)
 371 {
 372    assert(ptr);
 373    if (*ptr && prog) {
 374       /* sanity check */
 375       ASSERT((*ptr)->Target == prog->Target);
 376    }
 377    if (*ptr == prog) {
 378       return;  /* no change */
 379    }
 380    if (*ptr) {
 381       GLboolean deleteFlag;
 382
 383       /*_glthread_LOCK_MUTEX((*ptr)->Mutex);*/
 384 #if 0
 385       printf("Program %p ID=%u Target=%s  Refcount-- to %d\n",
 386              *ptr, (*ptr)->Id,
 387              ((*ptr)->Target == GL_VERTEX_PROGRAM_ARB ? "VP" : "FP"),
 388              (*ptr)->RefCount - 1);
 389 #endif
 390       ASSERT((*ptr)->RefCount > 0);
 391       (*ptr)->RefCount--;
 392
 393       deleteFlag = ((*ptr)->RefCount == 0);
 394       /*_glthread_UNLOCK_MUTEX((*ptr)->Mutex);*/
 395
 396       if (deleteFlag) {
 397          ASSERT(ctx);
 398          ctx->Driver.DeleteProgram(ctx, *ptr);
 399       }
 400
 401       *ptr = NULL;
 402    }
 403
 404    assert(!*ptr);
 405    if (prog) {
 406       /*_glthread_LOCK_MUTEX(prog->Mutex);*/
 407       prog->RefCount++;
 408 #if 0
 409       printf("Program %p ID=%u Target=%s  Refcount++ to %d\n",
 410              prog, prog->Id,
 411              (prog->Target == GL_VERTEX_PROGRAM_ARB ? "VP" : "FP"),
 412              prog->RefCount);
 413 #endif
 414       /*_glthread_UNLOCK_MUTEX(prog->Mutex);*/
 415    }
 416
 417    *ptr = prog;
 418 }
 419
 420
 421 /**
 422  * Return a copy of a program.
 423  * XXX Problem here if the program object is actually OO-derivation
 424  * made by a device driver.
 425  */
 426 struct gl_program *
 427 _mesa_clone_program(GLcontext *ctx, const struct gl_program *prog)
 428 {
 429    struct gl_program *clone;
 430
 431    clone = ctx->Driver.NewProgram(ctx, prog->Target, prog->Id);
 432    if (!clone)
 433       return NULL;
 434
 435    assert(clone->Target == prog->Target);
 436    assert(clone->RefCount == 1);
 437
 438    clone->String = (GLubyte *) _mesa_strdup((char *) prog->String);
 439    clone->Format = prog->Format;
 440    clone->Instructions = _mesa_alloc_instructions(prog->NumInstructions);
 441    if (!clone->Instructions) {
 442       _mesa_reference_program(ctx, &clone, NULL);
 443       return NULL;
 444    }
 445    _mesa_copy_instructions(clone->Instructions, prog->Instructions,
 446                            prog->NumInstructions);
 447    clone->InputsRead = prog->InputsRead;
 448    clone->OutputsWritten = prog->OutputsWritten;
 449    clone->SamplersUsed = prog->SamplersUsed;
 450    clone->ShadowSamplers = prog->ShadowSamplers;
 451    memcpy(clone->TexturesUsed, prog->TexturesUsed, sizeof(prog->TexturesUsed));
 452
 453    if (prog->Parameters)
 454       clone->Parameters = _mesa_clone_parameter_list(prog->Parameters);
 455    memcpy(clone->LocalParams, prog->LocalParams, sizeof(clone->LocalParams));
 456    if (prog->Varying)
 457       clone->Varying = _mesa_clone_parameter_list(prog->Varying);
 458    if (prog->Attributes)
 459       clone->Attributes = _mesa_clone_parameter_list(prog->Attributes);
 460    memcpy(clone->LocalParams, prog->LocalParams, sizeof(clone->LocalParams));
 461    clone->NumInstructions = prog->NumInstructions;
 462    clone->NumTemporaries = prog->NumTemporaries;
 463    clone->NumParameters = prog->NumParameters;
 464    clone->NumAttributes = prog->NumAttributes;
 465    clone->NumAddressRegs = prog->NumAddressRegs;
 466    clone->NumNativeInstructions = prog->NumNativeInstructions;
 467    clone->NumNativeTemporaries = prog->NumNativeTemporaries;
 468    clone->NumNativeParameters = prog->NumNativeParameters;
 469    clone->NumNativeAttributes = prog->NumNativeAttributes;
 470    clone->NumNativeAddressRegs = prog->NumNativeAddressRegs;
 471    clone->NumAluInstructions = prog->NumAluInstructions;
 472    clone->NumTexInstructions = prog->NumTexInstructions;
 473    clone->NumTexIndirections = prog->NumTexIndirections;
 474    clone->NumNativeAluInstructions = prog->NumNativeAluInstructions;
 475    clone->NumNativeTexInstructions = prog->NumNativeTexInstructions;
 476    clone->NumNativeTexIndirections = prog->NumNativeTexIndirections;
 477
 478    switch (prog->Target) {
 479    case GL_VERTEX_PROGRAM_ARB:
 480       {
 481          const struct gl_vertex_program *vp
 482             = (const struct gl_vertex_program *) prog;
 483          struct gl_vertex_program *vpc = (struct gl_vertex_program *) clone;
 484          vpc->IsPositionInvariant = vp->IsPositionInvariant;
 485       }
 486       break;
 487    case GL_FRAGMENT_PROGRAM_ARB:
 488       {
 489          const struct gl_fragment_program *fp
 490             = (const struct gl_fragment_program *) prog;
 491          struct gl_fragment_program *fpc = (struct gl_fragment_program *) clone;
 492          fpc->FogOption = fp->FogOption;
 493          fpc->UsesKill = fp->UsesKill;
 494       }
 495       break;
 496    default:
 497       _mesa_problem(NULL, "Unexpected target in _mesa_clone_program");
 498    }
 499
 500    return clone;
 501 }
 502
 503
 504 /**
 505  * Insert 'count' NOP instructions at 'start' in the given program.
 506  * Adjust branch targets accordingly.
 507  */
 508 GLboolean
 509 _mesa_insert_instructions(struct gl_program *prog, GLuint start, GLuint count)
 510 {
 511    const GLuint origLen = prog->NumInstructions;
 512    const GLuint newLen = origLen + count;
 513    struct prog_instruction *newInst;
 514    GLuint i;
 515
 516    /* adjust branches */
 517    for (i = 0; i < prog->NumInstructions; i++) {
 518       struct prog_instruction *inst = prog->Instructions + i;
 519       if (inst->BranchTarget > 0) {
 520          if ((GLuint)inst->BranchTarget >= start) {
 521             inst->BranchTarget += count;
 522          }
 523       }
 524    }
 525
 526    /* Alloc storage for new instructions */
 527    newInst = _mesa_alloc_instructions(newLen);
 528    if (!newInst) {
 529       return GL_FALSE;
 530    }
 531
 532    /* Copy 'start' instructions into new instruction buffer */
 533    _mesa_copy_instructions(newInst, prog->Instructions, start);
 534
 535    /* init the new instructions */
 536    _mesa_init_instructions(newInst + start, count);
 537
 538    /* Copy the remaining/tail instructions to new inst buffer */
 539    _mesa_copy_instructions(newInst + start + count,
 540                            prog->Instructions + start,
 541                            origLen - start);
 542
 543    /* free old instructions */
 544    _mesa_free_instructions(prog->Instructions, origLen);
 545
 546    /* install new instructions */
 547    prog->Instructions = newInst;
 548    prog->NumInstructions = newLen;
 549
 550    return GL_TRUE;
 551 }
 552
 553 /**
 554  * Delete 'count' instructions at 'start' in the given program.
 555  * Adjust branch targets accordingly.
 556  */
 557 GLboolean
 558 _mesa_delete_instructions(struct gl_program *prog, GLuint start, GLuint count)
 559 {
 560    const GLuint origLen = prog->NumInstructions;
 561    const GLuint newLen = origLen - count;
 562    struct prog_instruction *newInst;
 563    GLuint i;
 564
 565    /* adjust branches */
 566    for (i = 0; i < prog->NumInstructions; i++) {
 567       struct prog_instruction *inst = prog->Instructions + i;
 568       if (inst->BranchTarget > 0) {
 569          if (inst->BranchTarget >= start) {
 570             inst->BranchTarget -= count;
 571          }
 572       }
 573    }
 574
 575    /* Alloc storage for new instructions */
 576    newInst = _mesa_alloc_instructions(newLen);
 577    if (!newInst) {
 578       return GL_FALSE;
 579    }
 580
 581    /* Copy 'start' instructions into new instruction buffer */
 582    _mesa_copy_instructions(newInst, prog->Instructions, start);
 583
 584    /* Copy the remaining/tail instructions to new inst buffer */
 585    _mesa_copy_instructions(newInst + start,
 586                            prog->Instructions + start + count,
 587                            newLen - start);
 588
 589    /* free old instructions */
 590    _mesa_free_instructions(prog->Instructions, origLen);
 591
 592    /* install new instructions */
 593    prog->Instructions = newInst;
 594    prog->NumInstructions = newLen;
 595
 596    return GL_TRUE;
 597 }
 598
 599
 600 /**
 601  * Search instructions for registers that match (oldFile, oldIndex),
 602  * replacing them with (newFile, newIndex).
 603  */
 604 static void
 605 replace_registers(struct prog_instruction *inst, GLuint numInst,
 606                   GLuint oldFile, GLuint oldIndex,
 607                   GLuint newFile, GLuint newIndex)
 608 {
 609    GLuint i, j;
 610    for (i = 0; i < numInst; i++) {
 611       /* src regs */
 612       for (j = 0; j < _mesa_num_inst_src_regs(inst->Opcode); j++) {
 613          if (inst[i].SrcReg[j].File == oldFile &&
 614              inst[i].SrcReg[j].Index == oldIndex) {
 615             inst[i].SrcReg[j].File = newFile;
 616             inst[i].SrcReg[j].Index = newIndex;
 617          }
 618       }
 619       /* dst reg */
 620       if (inst[i].DstReg.File == oldFile && inst[i].DstReg.Index == oldIndex) {
 621          inst[i].DstReg.File = newFile;
 622          inst[i].DstReg.Index = newIndex;
 623       }
 624    }
 625 }
 626
 627
 628 /**
 629  * Search instructions for references to program parameters.  When found,
 630  * increment the parameter index by 'offset'.
 631  * Used when combining programs.
 632  */
 633 static void
 634 adjust_param_indexes(struct prog_instruction *inst, GLuint numInst,
 635                      GLuint offset)
 636 {
 637    GLuint i, j;
 638    for (i = 0; i < numInst; i++) {
 639       for (j = 0; j < _mesa_num_inst_src_regs(inst->Opcode); j++) {
 640          GLuint f = inst[i].SrcReg[j].File;
 641          if (f == PROGRAM_CONSTANT ||
 642              f == PROGRAM_UNIFORM ||
 643              f == PROGRAM_STATE_VAR) {
 644             inst[i].SrcReg[j].Index += offset;
 645          }
 646       }
 647    }
 648 }
 649
 650
 651 /**
 652  * Combine two programs into one.  Fix instructions so the outputs of
 653  * the first program go to the inputs of the second program.
 654  */
 655 struct gl_program *
 656 _mesa_combine_programs(GLcontext *ctx,
 657                        const struct gl_program *progA,
 658                        const struct gl_program *progB)
 659 {
 660    struct prog_instruction *newInst;
 661    struct gl_program *newProg;
 662    const GLuint lenA = progA->NumInstructions - 1; /* omit END instr */
 663    const GLuint lenB = progB->NumInstructions;
 664    const GLuint numParamsA = _mesa_num_parameters(progA->Parameters);
 665    const GLuint newLength = lenA + lenB;
 666    GLbitfield inputsB;
 667    GLuint i;
 668
 669    ASSERT(progA->Target == progB->Target);
 670
 671    newInst = _mesa_alloc_instructions(newLength);
 672    if (!newInst)
 673       return GL_FALSE;
 674
 675    _mesa_copy_instructions(newInst, progA->Instructions, lenA);
 676    _mesa_copy_instructions(newInst + lenA, progB->Instructions, lenB);
 677
 678    /* adjust branch / instruction addresses for B's instructions */
 679    for (i = 0; i < lenB; i++) {
 680       newInst[lenA + i].BranchTarget += lenA;
 681    }
 682
 683    newProg = ctx->Driver.NewProgram(ctx, progA->Target, 0);
 684    newProg->Instructions = newInst;
 685    newProg->NumInstructions = newLength;
 686
 687    if (newProg->Target == GL_FRAGMENT_PROGRAM_ARB) {
 688       struct gl_fragment_program *fprogA, *fprogB, *newFprog;
 689       fprogA = (struct gl_fragment_program *) progA;
 690       fprogB = (struct gl_fragment_program *) progB;
 691       newFprog = (struct gl_fragment_program *) newProg;
 692
 693       newFprog->UsesKill = fprogA->UsesKill || fprogB->UsesKill;
 694
 695       /* Connect color outputs of fprogA to color inputs of fprogB, via a
 696        * new temporary register.
 697        */
 698       if ((progA->OutputsWritten & (1 << FRAG_RESULT_COLR)) &&
 699           (progB->InputsRead & (1 << FRAG_ATTRIB_COL0))) {
 700          GLint tempReg = _mesa_find_free_register(newProg, PROGRAM_TEMPORARY);
 701          if (tempReg < 0) {
 702             _mesa_problem(ctx, "No free temp regs found in "
 703                           "_mesa_combine_programs(), using 31");
 704             tempReg = 31;
 705          }
 706          /* replace writes to result.color[0] with tempReg */
 707          replace_registers(newInst, lenA,
 708                            PROGRAM_OUTPUT, FRAG_RESULT_COLR,
 709                            PROGRAM_TEMPORARY, tempReg);
 710          /* replace reads from input.color[0] with tempReg */
 711          replace_registers(newInst + lenA, lenB,
 712                            PROGRAM_INPUT, FRAG_ATTRIB_COL0,
 713                            PROGRAM_TEMPORARY, tempReg);
 714       }
 715
 716       inputsB = progB->InputsRead;
 717       if (progA->OutputsWritten & (1 << FRAG_RESULT_COLR)) {
 718          inputsB &= ~(1 << FRAG_ATTRIB_COL0);
 719       }
 720       newProg->InputsRead = progA->InputsRead | inputsB;
 721       newProg->OutputsWritten = progB->OutputsWritten;
 722       newProg->SamplersUsed = progA->SamplersUsed | progB->SamplersUsed;
 723    }
 724    else {
 725       /* vertex program */
 726       assert(0);      /* XXX todo */
 727    }
 728
 729    /*
 730     * Merge parameters (uniforms, constants, etc)
 731     */
 732    newProg->Parameters = _mesa_combine_parameter_lists(progA->Parameters,
 733                                                        progB->Parameters);
 734
 735    adjust_param_indexes(newInst + lenA, lenB, numParamsA);
 736
 737
 738    return newProg;
 739 }
 740
 741
 742
 743
 744 /**
 745  * Scan the given program to find a free register of the given type.
 746  * \param regFile - PROGRAM_INPUT, PROGRAM_OUTPUT or PROGRAM_TEMPORARY
 747  */
 748 GLint
 749 _mesa_find_free_register(const struct gl_program *prog, GLuint regFile)
 750 {
 751    GLboolean used[MAX_PROGRAM_TEMPS];
 752    GLuint i, k;
 753
 754    assert(regFile == PROGRAM_INPUT ||
 755           regFile == PROGRAM_OUTPUT ||
 756           regFile == PROGRAM_TEMPORARY);
 757
 758    _mesa_memset(used, 0, sizeof(used));
 759
 760    for (i = 0; i < prog->NumInstructions; i++) {
 761       const struct prog_instruction *inst = prog->Instructions + i;
 762       const GLuint n = _mesa_num_inst_src_regs(inst->Opcode);
 763
 764       for (k = 0; k < n; k++) {
 765          if (inst->SrcReg[k].File == regFile) {
 766             used[inst->SrcReg[k].Index] = GL_TRUE;
 767          }
 768       }
 769    }
 770
 771    for (i = 0; i < MAX_PROGRAM_TEMPS; i++) {
 772       if (!used[i])
 773          return i;
 774    }
 775
 776    return -1;
 777 }