reactos/dll/opengl/mesa/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 "main/mfeatures.h"
  36 #include "program.h"
  37 #include "prog_cache.h"
  38 #include "prog_parameter.h"
  39 #include "prog_instruction.h"
  40
  41
  42 /**
  43  * A pointer to this dummy program is put into the hash table when
  44  * glGenPrograms is called.
  45  */
  46 struct gl_program _mesa_DummyProgram;
  47
  48
  49 /**
  50  * Init context's vertex/fragment program state
  51  */
  52 void
  53 _mesa_init_program(struct gl_context *ctx)
  54 {
  55    GLuint i;
  56
  57    /*
  58     * If this assertion fails, we need to increase the field
  59     * size for register indexes (see INST_INDEX_BITS).
  60     */
  61    ASSERT(ctx->Const.VertexProgram.MaxUniformComponents / 4
  62           <= (1 << INST_INDEX_BITS));
  63    ASSERT(ctx->Const.FragmentProgram.MaxUniformComponents / 4
  64           <= (1 << INST_INDEX_BITS));
  65
  66    ASSERT(ctx->Const.VertexProgram.MaxTemps <= (1 << INST_INDEX_BITS));
  67    ASSERT(ctx->Const.VertexProgram.MaxLocalParams <= (1 << INST_INDEX_BITS));
  68    ASSERT(ctx->Const.FragmentProgram.MaxTemps <= (1 << INST_INDEX_BITS));
  69    ASSERT(ctx->Const.FragmentProgram.MaxLocalParams <= (1 << INST_INDEX_BITS));
  70
  71    ASSERT(ctx->Const.VertexProgram.MaxUniformComponents <= 4 * MAX_UNIFORMS);
  72    ASSERT(ctx->Const.FragmentProgram.MaxUniformComponents <= 4 * MAX_UNIFORMS);
  73
  74    ASSERT(ctx->Const.VertexProgram.MaxAddressOffset <= (1 << INST_INDEX_BITS));
  75    ASSERT(ctx->Const.FragmentProgram.MaxAddressOffset <= (1 << INST_INDEX_BITS));
  76
  77    /* If this fails, increase prog_instruction::TexSrcUnit size */
  78    ASSERT(MAX_TEXTURE_UNITS <= (1 << 5));
  79
  80    /* If this fails, increase prog_instruction::TexSrcTarget size */
  81    ASSERT(NUM_TEXTURE_TARGETS <= (1 << 4));
  82
  83    ctx->Program.ErrorPos = -1;
  84    ctx->Program.ErrorString = _mesa_strdup("");
  85
  86 #if FEATURE_NV_vertex_program || FEATURE_ARB_vertex_program
  87    ctx->VertexProgram.Enabled = GL_FALSE;
  88 #if FEATURE_es2_glsl
  89    ctx->VertexProgram.PointSizeEnabled =
  90       (ctx->API == API_OPENGLES2) ? GL_TRUE : GL_FALSE;
  91 #else
  92    ctx->VertexProgram.PointSizeEnabled = GL_FALSE;
  93 #endif
  94    ctx->VertexProgram.TwoSideEnabled = GL_FALSE;
  95    _mesa_reference_vertprog(ctx, &ctx->VertexProgram.Current,
  96                             ctx->Shared->DefaultVertexProgram);
  97    assert(ctx->VertexProgram.Current);
  98    for (i = 0; i < MAX_NV_VERTEX_PROGRAM_PARAMS / 4; i++) {
  99       ctx->VertexProgram.TrackMatrix[i] = GL_NONE;
 100       ctx->VertexProgram.TrackMatrixTransform[i] = GL_IDENTITY_NV;
 101    }
 102    ctx->VertexProgram.Cache = _mesa_new_program_cache();
 103 #endif
 104
 105 #if FEATURE_NV_fragment_program || FEATURE_ARB_fragment_program
 106    ctx->FragmentProgram.Enabled = GL_FALSE;
 107    _mesa_reference_fragprog(ctx, &ctx->FragmentProgram.Current,
 108                             ctx->Shared->DefaultFragmentProgram);
 109    assert(ctx->FragmentProgram.Current);
 110    ctx->FragmentProgram.Cache = _mesa_new_program_cache();
 111 #endif
 112
 113 #if FEATURE_ARB_geometry_shader4
 114    ctx->GeometryProgram.Enabled = GL_FALSE;
 115    /* right now by default we don't have a geometry program */
 116    _mesa_reference_geomprog(ctx, &ctx->GeometryProgram.Current,
 117                             NULL);
 118    ctx->GeometryProgram.Cache = _mesa_new_program_cache();
 119 #endif
 120 }
 121
 122
 123 /**
 124  * Free a context's vertex/fragment program state
 125  */
 126 void
 127 _mesa_free_program_data(struct gl_context *ctx)
 128 {
 129 #if FEATURE_NV_vertex_program || FEATURE_ARB_vertex_program
 130    _mesa_reference_vertprog(ctx, &ctx->VertexProgram.Current, NULL);
 131    _mesa_delete_program_cache(ctx, ctx->VertexProgram.Cache);
 132 #endif
 133 #if FEATURE_NV_fragment_program || FEATURE_ARB_fragment_program
 134    _mesa_reference_fragprog(ctx, &ctx->FragmentProgram.Current, NULL);
 135    _mesa_delete_shader_cache(ctx, ctx->FragmentProgram.Cache);
 136 #endif
 137 #if FEATURE_ARB_geometry_shader4
 138    _mesa_reference_geomprog(ctx, &ctx->GeometryProgram.Current, NULL);
 139    _mesa_delete_program_cache(ctx, ctx->GeometryProgram.Cache);
 140 #endif
 141    free((void *) ctx->Program.ErrorString);
 142 }
 143
 144
 145 /**
 146  * Update the default program objects in the given context to reference those
 147  * specified in the shared state and release those referencing the old
 148  * shared state.
 149  */
 150 void
 151 _mesa_update_default_objects_program(struct gl_context *ctx)
 152 {
 153 #if FEATURE_NV_vertex_program || FEATURE_ARB_vertex_program
 154    _mesa_reference_vertprog(ctx, &ctx->VertexProgram.Current,
 155                             (struct gl_vertex_program *)
 156                             ctx->Shared->DefaultVertexProgram);
 157    assert(ctx->VertexProgram.Current);
 158 #endif
 159
 160 #if FEATURE_NV_fragment_program || FEATURE_ARB_fragment_program
 161    _mesa_reference_fragprog(ctx, &ctx->FragmentProgram.Current,
 162                             (struct gl_fragment_program *)
 163                             ctx->Shared->DefaultFragmentProgram);
 164    assert(ctx->FragmentProgram.Current);
 165 #endif
 166
 167 #if FEATURE_ARB_geometry_shader4
 168    _mesa_reference_geomprog(ctx, &ctx->GeometryProgram.Current,
 169                             (struct gl_geometry_program *)
 170                             ctx->Shared->DefaultGeometryProgram);
 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(struct gl_context *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( struct gl_context *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( struct gl_context *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( struct gl_context *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  * Initialize a new geometry program object.
 289  */
 290 struct gl_program *
 291 _mesa_init_geometry_program( struct gl_context *ctx, struct gl_geometry_program *prog,
 292                              GLenum target, GLuint id)
 293 {
 294    if (prog)
 295       return _mesa_init_program_struct( ctx, &prog->Base, target, id );
 296    else
 297       return NULL;
 298 }
 299
 300
 301 /**
 302  * Allocate and initialize a new fragment/vertex program object but
 303  * don't put it into the program hash table.  Called via
 304  * ctx->Driver.NewProgram.  May be overridden (ie. replaced) by a
 305  * device driver function to implement OO deriviation with additional
 306  * types not understood by this function.
 307  *
 308  * \param ctx  context
 309  * \param id   program id/number
 310  * \param target  program target/type
 311  * \return  pointer to new program object
 312  */
 313 struct gl_program *
 314 _mesa_new_program(struct gl_context *ctx, GLenum target, GLuint id)
 315 {
 316    struct gl_program *prog;
 317    switch (target) {
 318    case GL_VERTEX_PROGRAM_ARB: /* == GL_VERTEX_PROGRAM_NV */
 319    case GL_VERTEX_STATE_PROGRAM_NV:
 320       prog = _mesa_init_vertex_program(ctx, CALLOC_STRUCT(gl_vertex_program),
 321                                        target, id );
 322       break;
 323    case GL_FRAGMENT_PROGRAM_NV:
 324    case GL_FRAGMENT_PROGRAM_ARB:
 325       prog =_mesa_init_fragment_program(ctx,
 326                                          CALLOC_STRUCT(gl_fragment_program),
 327                                          target, id );
 328       break;
 329    case MESA_GEOMETRY_PROGRAM:
 330       prog = _mesa_init_geometry_program(ctx,
 331                                          CALLOC_STRUCT(gl_geometry_program),
 332                                          target, id);
 333       break;
 334    default:
 335       _mesa_problem(ctx, "bad target in _mesa_new_program");
 336       prog = NULL;
 337    }
 338    return prog;
 339 }
 340
 341
 342 /**
 343  * Delete a program and remove it from the hash table, ignoring the
 344  * reference count.
 345  * Called via ctx->Driver.DeleteProgram.  May be wrapped (OO deriviation)
 346  * by a device driver function.
 347  */
 348 void
 349 _mesa_delete_program(struct gl_context *ctx, struct gl_program *prog)
 350 {
 351    (void) ctx;
 352    ASSERT(prog);
 353    ASSERT(prog->RefCount==0);
 354
 355    if (prog == &_mesa_DummyProgram)
 356       return;
 357
 358    if (prog->String)
 359       free(prog->String);
 360
 361    if (prog->Instructions) {
 362       _mesa_free_instructions(prog->Instructions, prog->NumInstructions);
 363    }
 364    if (prog->Parameters) {
 365       _mesa_free_parameter_list(prog->Parameters);
 366    }
 367
 368    free(prog);
 369 }
 370
 371
 372 /**
 373  * Return the gl_program object for a given ID.
 374  * Basically just a wrapper for _mesa_HashLookup() to avoid a lot of
 375  * casts elsewhere.
 376  */
 377 struct gl_program *
 378 _mesa_lookup_program(struct gl_context *ctx, GLuint id)
 379 {
 380    if (id)
 381       return (struct gl_program *) _mesa_HashLookup(ctx->Shared->Programs, id);
 382    else
 383       return NULL;
 384 }
 385
 386
 387 /**
 388  * Reference counting for vertex/fragment programs
 389  * This is normally only called from the _mesa_reference_program() macro
 390  * when there's a real pointer change.
 391  */
 392 void
 393 _mesa_reference_program_(struct gl_context *ctx,
 394                          struct gl_program **ptr,
 395                          struct gl_program *prog)
 396 {
 397 #ifndef NDEBUG
 398    assert(ptr);
 399    if (*ptr && prog) {
 400       /* sanity check */
 401       if ((*ptr)->Target == GL_VERTEX_PROGRAM_ARB)
 402          ASSERT(prog->Target == GL_VERTEX_PROGRAM_ARB);
 403       else if ((*ptr)->Target == GL_FRAGMENT_PROGRAM_ARB)
 404          ASSERT(prog->Target == GL_FRAGMENT_PROGRAM_ARB ||
 405                 prog->Target == GL_FRAGMENT_PROGRAM_NV);
 406       else if ((*ptr)->Target == MESA_GEOMETRY_PROGRAM)
 407          ASSERT(prog->Target == MESA_GEOMETRY_PROGRAM);
 408    }
 409 #endif
 410
 411    if (*ptr) {
 412       GLboolean deleteFlag;
 413
 414       /*_glthread_LOCK_MUTEX((*ptr)->Mutex);*/
 415 #if 0
 416       printf("Program %p ID=%u Target=%s  Refcount-- to %d\n",
 417              *ptr, (*ptr)->Id,
 418              ((*ptr)->Target == GL_VERTEX_PROGRAM_ARB ? "VP" :
 419               ((*ptr)->Target == MESA_GEOMETRY_PROGRAM ? "GP" : "FP")),
 420              (*ptr)->RefCount - 1);
 421 #endif
 422       ASSERT((*ptr)->RefCount > 0);
 423       (*ptr)->RefCount--;
 424
 425       deleteFlag = ((*ptr)->RefCount == 0);
 426       /*_glthread_UNLOCK_MUTEX((*ptr)->Mutex);*/
 427
 428       if (deleteFlag) {
 429          ASSERT(ctx);
 430          ctx->Driver.DeleteProgram(ctx, *ptr);
 431       }
 432
 433       *ptr = NULL;
 434    }
 435
 436    assert(!*ptr);
 437    if (prog) {
 438       /*_glthread_LOCK_MUTEX(prog->Mutex);*/
 439       prog->RefCount++;
 440 #if 0
 441       printf("Program %p ID=%u Target=%s  Refcount++ to %d\n",
 442              prog, prog->Id,
 443              (prog->Target == GL_VERTEX_PROGRAM_ARB ? "VP" :
 444               (prog->Target == MESA_GEOMETRY_PROGRAM ? "GP" : "FP")),
 445              prog->RefCount);
 446 #endif
 447       /*_glthread_UNLOCK_MUTEX(prog->Mutex);*/
 448    }
 449
 450    *ptr = prog;
 451 }
 452
 453
 454 /**
 455  * Return a copy of a program.
 456  * XXX Problem here if the program object is actually OO-derivation
 457  * made by a device driver.
 458  */
 459 struct gl_program *
 460 _mesa_clone_program(struct gl_context *ctx, const struct gl_program *prog)
 461 {
 462    struct gl_program *clone;
 463
 464    clone = ctx->Driver.NewProgram(ctx, prog->Target, prog->Id);
 465    if (!clone)
 466       return NULL;
 467
 468    assert(clone->Target == prog->Target);
 469    assert(clone->RefCount == 1);
 470
 471    clone->String = (GLubyte *) _mesa_strdup((char *) prog->String);
 472    clone->Format = prog->Format;
 473    clone->Instructions = _mesa_alloc_instructions(prog->NumInstructions);
 474    if (!clone->Instructions) {
 475       _mesa_reference_program(ctx, &clone, NULL);
 476       return NULL;
 477    }
 478    _mesa_copy_instructions(clone->Instructions, prog->Instructions,
 479                            prog->NumInstructions);
 480    clone->InputsRead = prog->InputsRead;
 481    clone->OutputsWritten = prog->OutputsWritten;
 482    clone->SamplersUsed = prog->SamplersUsed;
 483    clone->ShadowSamplers = prog->ShadowSamplers;
 484    memcpy(clone->TexturesUsed, prog->TexturesUsed, sizeof(prog->TexturesUsed));
 485
 486    if (prog->Parameters)
 487       clone->Parameters = _mesa_clone_parameter_list(prog->Parameters);
 488    memcpy(clone->LocalParams, prog->LocalParams, sizeof(clone->LocalParams));
 489    memcpy(clone->LocalParams, prog->LocalParams, sizeof(clone->LocalParams));
 490    clone->IndirectRegisterFiles = prog->IndirectRegisterFiles;
 491    clone->NumInstructions = prog->NumInstructions;
 492    clone->NumTemporaries = prog->NumTemporaries;
 493    clone->NumParameters = prog->NumParameters;
 494    clone->NumAttributes = prog->NumAttributes;
 495    clone->NumAddressRegs = prog->NumAddressRegs;
 496    clone->NumNativeInstructions = prog->NumNativeInstructions;
 497    clone->NumNativeTemporaries = prog->NumNativeTemporaries;
 498    clone->NumNativeParameters = prog->NumNativeParameters;
 499    clone->NumNativeAttributes = prog->NumNativeAttributes;
 500    clone->NumNativeAddressRegs = prog->NumNativeAddressRegs;
 501    clone->NumAluInstructions = prog->NumAluInstructions;
 502    clone->NumTexInstructions = prog->NumTexInstructions;
 503    clone->NumTexIndirections = prog->NumTexIndirections;
 504    clone->NumNativeAluInstructions = prog->NumNativeAluInstructions;
 505    clone->NumNativeTexInstructions = prog->NumNativeTexInstructions;
 506    clone->NumNativeTexIndirections = prog->NumNativeTexIndirections;
 507
 508    switch (prog->Target) {
 509    case GL_VERTEX_PROGRAM_ARB:
 510       {
 511          const struct gl_vertex_program *vp
 512             = (const struct gl_vertex_program *) prog;
 513          struct gl_vertex_program *vpc = (struct gl_vertex_program *) clone;
 514          vpc->IsPositionInvariant = vp->IsPositionInvariant;
 515          vpc->IsNVProgram = vp->IsNVProgram;
 516       }
 517       break;
 518    case GL_FRAGMENT_PROGRAM_ARB:
 519       {
 520          const struct gl_fragment_program *fp
 521             = (const struct gl_fragment_program *) prog;
 522          struct gl_fragment_program *fpc = (struct gl_fragment_program *) clone;
 523          fpc->UsesKill = fp->UsesKill;
 524          fpc->OriginUpperLeft = fp->OriginUpperLeft;
 525          fpc->PixelCenterInteger = fp->PixelCenterInteger;
 526       }
 527       break;
 528    case MESA_GEOMETRY_PROGRAM:
 529       {
 530          const struct gl_geometry_program *gp
 531             = (const struct gl_geometry_program *) prog;
 532          struct gl_geometry_program *gpc = (struct gl_geometry_program *) clone;
 533          gpc->VerticesOut = gp->VerticesOut;
 534          gpc->InputType = gp->InputType;
 535          gpc->OutputType = gp->OutputType;
 536       }
 537       break;
 538    default:
 539       _mesa_problem(NULL, "Unexpected target in _mesa_clone_program");
 540    }
 541
 542    return clone;
 543 }
 544
 545
 546 /**
 547  * Insert 'count' NOP instructions at 'start' in the given program.
 548  * Adjust branch targets accordingly.
 549  */
 550 GLboolean
 551 _mesa_insert_instructions(struct gl_program *prog, GLuint start, GLuint count)
 552 {
 553    const GLuint origLen = prog->NumInstructions;
 554    const GLuint newLen = origLen + count;
 555    struct prog_instruction *newInst;
 556    GLuint i;
 557
 558    /* adjust branches */
 559    for (i = 0; i < prog->NumInstructions; i++) {
 560       struct prog_instruction *inst = prog->Instructions + i;
 561       if (inst->BranchTarget > 0) {
 562          if ((GLuint)inst->BranchTarget >= start) {
 563             inst->BranchTarget += count;
 564          }
 565       }
 566    }
 567
 568    /* Alloc storage for new instructions */
 569    newInst = _mesa_alloc_instructions(newLen);
 570    if (!newInst) {
 571       return GL_FALSE;
 572    }
 573
 574    /* Copy 'start' instructions into new instruction buffer */
 575    _mesa_copy_instructions(newInst, prog->Instructions, start);
 576
 577    /* init the new instructions */
 578    _mesa_init_instructions(newInst + start, count);
 579
 580    /* Copy the remaining/tail instructions to new inst buffer */
 581    _mesa_copy_instructions(newInst + start + count,
 582                            prog->Instructions + start,
 583                            origLen - start);
 584
 585    /* free old instructions */
 586    _mesa_free_instructions(prog->Instructions, origLen);
 587
 588    /* install new instructions */
 589    prog->Instructions = newInst;
 590    prog->NumInstructions = newLen;
 591
 592    return GL_TRUE;
 593 }
 594
 595 /**
 596  * Delete 'count' instructions at 'start' in the given program.
 597  * Adjust branch targets accordingly.
 598  */
 599 GLboolean
 600 _mesa_delete_instructions(struct gl_program *prog, GLuint start, GLuint count)
 601 {
 602    const GLuint origLen = prog->NumInstructions;
 603    const GLuint newLen = origLen - count;
 604    struct prog_instruction *newInst;
 605    GLuint i;
 606
 607    /* adjust branches */
 608    for (i = 0; i < prog->NumInstructions; i++) {
 609       struct prog_instruction *inst = prog->Instructions + i;
 610       if (inst->BranchTarget > 0) {
 611          if (inst->BranchTarget > (GLint) start) {
 612             inst->BranchTarget -= count;
 613          }
 614       }
 615    }
 616
 617    /* Alloc storage for new instructions */
 618    newInst = _mesa_alloc_instructions(newLen);
 619    if (!newInst) {
 620       return GL_FALSE;
 621    }
 622
 623    /* Copy 'start' instructions into new instruction buffer */
 624    _mesa_copy_instructions(newInst, prog->Instructions, start);
 625
 626    /* Copy the remaining/tail instructions to new inst buffer */
 627    _mesa_copy_instructions(newInst + start,
 628                            prog->Instructions + start + count,
 629                            newLen - start);
 630
 631    /* free old instructions */
 632    _mesa_free_instructions(prog->Instructions, origLen);
 633
 634    /* install new instructions */
 635    prog->Instructions = newInst;
 636    prog->NumInstructions = newLen;
 637
 638    return GL_TRUE;
 639 }
 640
 641
 642 /**
 643  * Search instructions for registers that match (oldFile, oldIndex),
 644  * replacing them with (newFile, newIndex).
 645  */
 646 static void
 647 replace_registers(struct prog_instruction *inst, GLuint numInst,
 648                   GLuint oldFile, GLuint oldIndex,
 649                   GLuint newFile, GLuint newIndex)
 650 {
 651    GLuint i, j;
 652    for (i = 0; i < numInst; i++) {
 653       /* src regs */
 654       for (j = 0; j < _mesa_num_inst_src_regs(inst[i].Opcode); j++) {
 655          if (inst[i].SrcReg[j].File == oldFile &&
 656              inst[i].SrcReg[j].Index == oldIndex) {
 657             inst[i].SrcReg[j].File = newFile;
 658             inst[i].SrcReg[j].Index = newIndex;
 659          }
 660       }
 661       /* dst reg */
 662       if (inst[i].DstReg.File == oldFile && inst[i].DstReg.Index == oldIndex) {
 663          inst[i].DstReg.File = newFile;
 664          inst[i].DstReg.Index = newIndex;
 665       }
 666    }
 667 }
 668
 669
 670 /**
 671  * Search instructions for references to program parameters.  When found,
 672  * increment the parameter index by 'offset'.
 673  * Used when combining programs.
 674  */
 675 static void
 676 adjust_param_indexes(struct prog_instruction *inst, GLuint numInst,
 677                      GLuint offset)
 678 {
 679    GLuint i, j;
 680    for (i = 0; i < numInst; i++) {
 681       for (j = 0; j < _mesa_num_inst_src_regs(inst[i].Opcode); j++) {
 682          GLuint f = inst[i].SrcReg[j].File;
 683          if (f == PROGRAM_CONSTANT ||
 684              f == PROGRAM_UNIFORM ||
 685              f == PROGRAM_STATE_VAR) {
 686             inst[i].SrcReg[j].Index += offset;
 687          }
 688       }
 689    }
 690 }
 691
 692
 693 /**
 694  * Combine two programs into one.  Fix instructions so the outputs of
 695  * the first program go to the inputs of the second program.
 696  */
 697 struct gl_program *
 698 _mesa_combine_programs(struct gl_context *ctx,
 699                        const struct gl_program *progA,
 700                        const struct gl_program *progB)
 701 {
 702    struct prog_instruction *newInst;
 703    struct gl_program *newProg;
 704    const GLuint lenA = progA->NumInstructions - 1; /* omit END instr */
 705    const GLuint lenB = progB->NumInstructions;
 706    const GLuint numParamsA = _mesa_num_parameters(progA->Parameters);
 707    const GLuint newLength = lenA + lenB;
 708    GLboolean usedTemps[MAX_PROGRAM_TEMPS];
 709    GLuint firstTemp = 0;
 710    GLbitfield inputsB;
 711    GLuint i;
 712
 713    ASSERT(progA->Target == progB->Target);
 714
 715    newInst = _mesa_alloc_instructions(newLength);
 716    if (!newInst)
 717       return GL_FALSE;
 718
 719    _mesa_copy_instructions(newInst, progA->Instructions, lenA);
 720    _mesa_copy_instructions(newInst + lenA, progB->Instructions, lenB);
 721
 722    /* adjust branch / instruction addresses for B's instructions */
 723    for (i = 0; i < lenB; i++) {
 724       newInst[lenA + i].BranchTarget += lenA;
 725    }
 726
 727    newProg = ctx->Driver.NewProgram(ctx, progA->Target, 0);
 728    newProg->Instructions = newInst;
 729    newProg->NumInstructions = newLength;
 730
 731    /* find used temp regs (we may need new temps below) */
 732    _mesa_find_used_registers(newProg, PROGRAM_TEMPORARY,
 733                              usedTemps, MAX_PROGRAM_TEMPS);
 734
 735    if (newProg->Target == GL_FRAGMENT_PROGRAM_ARB) {
 736       struct gl_fragment_program *fprogA, *fprogB, *newFprog;
 737       GLbitfield progB_inputsRead = progB->InputsRead;
 738       GLint progB_colorFile, progB_colorIndex;
 739
 740       fprogA = (struct gl_fragment_program *) progA;
 741       fprogB = (struct gl_fragment_program *) progB;
 742       newFprog = (struct gl_fragment_program *) newProg;
 743
 744       newFprog->UsesKill = fprogA->UsesKill || fprogB->UsesKill;
 745
 746       /* We'll do a search and replace for instances
 747        * of progB_colorFile/progB_colorIndex below...
 748        */
 749       progB_colorFile = PROGRAM_INPUT;
 750       progB_colorIndex = FRAG_ATTRIB_COL0;
 751
 752       /*
 753        * The fragment program may get color from a state var rather than
 754        * a fragment input (vertex output) if it's constant.
 755        * See the texenvprogram.c code.
 756        * So, search the program's parameter list now to see if the program
 757        * gets color from a state var instead of a conventional fragment
 758        * input register.
 759        */
 760       for (i = 0; i < progB->Parameters->NumParameters; i++) {
 761          struct gl_program_parameter *p = &progB->Parameters->Parameters[i];
 762          if (p->Type == PROGRAM_STATE_VAR &&
 763              p->StateIndexes[0] == STATE_INTERNAL &&
 764              p->StateIndexes[1] == STATE_CURRENT_ATTRIB &&
 765              (int) p->StateIndexes[2] == (int) VERT_ATTRIB_COLOR0) {
 766             progB_inputsRead |= FRAG_BIT_COL0;
 767             progB_colorFile = PROGRAM_STATE_VAR;
 768             progB_colorIndex = i;
 769             break;
 770          }
 771       }
 772
 773       /* Connect color outputs of fprogA to color inputs of fprogB, via a
 774        * new temporary register.
 775        */
 776       if ((progA->OutputsWritten & BITFIELD64_BIT(FRAG_RESULT_COLOR)) &&
 777           (progB_inputsRead & FRAG_BIT_COL0)) {
 778          GLint tempReg = _mesa_find_free_register(usedTemps, MAX_PROGRAM_TEMPS,
 779                                                   firstTemp);
 780          if (tempReg < 0) {
 781             _mesa_problem(ctx, "No free temp regs found in "
 782                           "_mesa_combine_programs(), using 31");
 783             tempReg = 31;
 784          }
 785          firstTemp = tempReg + 1;
 786
 787          /* replace writes to result.color[0] with tempReg */
 788          replace_registers(newInst, lenA,
 789                            PROGRAM_OUTPUT, FRAG_RESULT_COLOR,
 790                            PROGRAM_TEMPORARY, tempReg);
 791          /* replace reads from the input color with tempReg */
 792          replace_registers(newInst + lenA, lenB,
 793                            progB_colorFile, progB_colorIndex, /* search for */
 794                            PROGRAM_TEMPORARY, tempReg  /* replace with */ );
 795       }
 796
 797       /* compute combined program's InputsRead */
 798       inputsB = progB_inputsRead;
 799       if (progA->OutputsWritten & BITFIELD64_BIT(FRAG_RESULT_COLOR)) {
 800          inputsB &= ~(1 << FRAG_ATTRIB_COL0);
 801       }
 802       newProg->InputsRead = progA->InputsRead | inputsB;
 803       newProg->OutputsWritten = progB->OutputsWritten;
 804       newProg->SamplersUsed = progA->SamplersUsed | progB->SamplersUsed;
 805    }
 806    else {
 807       /* vertex program */
 808       assert(0);      /* XXX todo */
 809    }
 810
 811    /*
 812     * Merge parameters (uniforms, constants, etc)
 813     */
 814    newProg->Parameters = _mesa_combine_parameter_lists(progA->Parameters,
 815                                                        progB->Parameters);
 816
 817    adjust_param_indexes(newInst + lenA, lenB, numParamsA);
 818
 819
 820    return newProg;
 821 }
 822
 823
 824 /**
 825  * Populate the 'used' array with flags indicating which registers (TEMPs,
 826  * INPUTs, OUTPUTs, etc, are used by the given program.
 827  * \param file  type of register to scan for
 828  * \param used  returns true/false flags for in use / free
 829  * \param usedSize  size of the 'used' array
 830  */
 831 void
 832 _mesa_find_used_registers(const struct gl_program *prog,
 833                           gl_register_file file,
 834                           GLboolean used[], GLuint usedSize)
 835 {
 836    GLuint i, j;
 837
 838    memset(used, 0, usedSize);
 839
 840    for (i = 0; i < prog->NumInstructions; i++) {
 841       const struct prog_instruction *inst = prog->Instructions + i;
 842       const GLuint n = _mesa_num_inst_src_regs(inst->Opcode);
 843
 844       if (inst->DstReg.File == file) {
 845          ASSERT(inst->DstReg.Index < usedSize);
 846          if(inst->DstReg.Index < usedSize)
 847             used[inst->DstReg.Index] = GL_TRUE;
 848       }
 849
 850       for (j = 0; j < n; j++) {
 851          if (inst->SrcReg[j].File == file) {
 852             ASSERT(inst->SrcReg[j].Index < usedSize);
 853             if(inst->SrcReg[j].Index < usedSize)
 854                used[inst->SrcReg[j].Index] = GL_TRUE;
 855          }
 856       }
 857    }
 858 }
 859
 860
 861 /**
 862  * Scan the given 'used' register flag array for the first entry
 863  * that's >= firstReg.
 864  * \param used  vector of flags indicating registers in use (as returned
 865  *              by _mesa_find_used_registers())
 866  * \param usedSize  size of the 'used' array
 867  * \param firstReg  first register to start searching at
 868  * \return index of unused register, or -1 if none.
 869  */
 870 GLint
 871 _mesa_find_free_register(const GLboolean used[],
 872                          GLuint usedSize, GLuint firstReg)
 873 {
 874    GLuint i;
 875
 876    assert(firstReg < usedSize);
 877
 878    for (i = firstReg; i < usedSize; i++)
 879       if (!used[i])
 880          return i;
 881
 882    return -1;
 883 }
 884
 885
 886
 887 /**
 888  * Check if the given register index is valid (doesn't exceed implementation-
 889  * dependent limits).
 890  * \return GL_TRUE if OK, GL_FALSE if bad index
 891  */
 892 GLboolean
 893 _mesa_valid_register_index(const struct gl_context *ctx,
 894                            gl_shader_type shaderType,
 895                            gl_register_file file, GLint index)
 896 {
 897    const struct gl_program_constants *c;
 898
 899    switch (shaderType) {
 900    case MESA_SHADER_VERTEX:
 901       c = &ctx->Const.VertexProgram;
 902       break;
 903    case MESA_SHADER_FRAGMENT:
 904       c = &ctx->Const.FragmentProgram;
 905       break;
 906    case MESA_SHADER_GEOMETRY:
 907       c = &ctx->Const.GeometryProgram;
 908       break;
 909    default:
 910       _mesa_problem(ctx,
 911                     "unexpected shader type in _mesa_valid_register_index()");
 912       return GL_FALSE;
 913    }
 914
 915    switch (file) {
 916    case PROGRAM_UNDEFINED:
 917       return GL_TRUE;  /* XXX or maybe false? */
 918
 919    case PROGRAM_TEMPORARY:
 920       return index >= 0 && index < c->MaxTemps;
 921
 922    case PROGRAM_ENV_PARAM:
 923       return index >= 0 && index < c->MaxEnvParams;
 924
 925    case PROGRAM_LOCAL_PARAM:
 926       return index >= 0 && index < c->MaxLocalParams;
 927
 928    case PROGRAM_NAMED_PARAM:
 929       return index >= 0 && index < c->MaxParameters;
 930
 931    case PROGRAM_UNIFORM:
 932    case PROGRAM_STATE_VAR:
 933       /* aka constant buffer */
 934       return index >= 0 && index < c->MaxUniformComponents / 4;
 935
 936    case PROGRAM_CONSTANT:
 937       /* constant buffer w/ possible relative negative addressing */
 938       return (index > (int) c->MaxUniformComponents / -4 &&
 939               index < c->MaxUniformComponents / 4);
 940
 941    case PROGRAM_INPUT:
 942       if (index < 0)
 943          return GL_FALSE;
 944
 945       switch (shaderType) {
 946       case MESA_SHADER_VERTEX:
 947          return index < VERT_ATTRIB_GENERIC0 + c->MaxAttribs;
 948       case MESA_SHADER_FRAGMENT:
 949          return index < FRAG_ATTRIB_VAR0 + ctx->Const.MaxVarying;
 950       case MESA_SHADER_GEOMETRY:
 951          return index < GEOM_ATTRIB_VAR0 + ctx->Const.MaxVarying;
 952       default:
 953          return GL_FALSE;
 954       }
 955
 956    case PROGRAM_OUTPUT:
 957       if (index < 0)
 958          return GL_FALSE;
 959
 960       switch (shaderType) {
 961       case MESA_SHADER_VERTEX:
 962          return index < VERT_RESULT_VAR0 + ctx->Const.MaxVarying;
 963       case MESA_SHADER_FRAGMENT:
 964          return index < FRAG_RESULT_DATA0 + ctx->Const.MaxDrawBuffers;
 965       case MESA_SHADER_GEOMETRY:
 966          return index < GEOM_RESULT_VAR0 + ctx->Const.MaxVarying;
 967       default:
 968          return GL_FALSE;
 969       }
 970
 971    case PROGRAM_ADDRESS:
 972       return index >= 0 && index < c->MaxAddressRegs;
 973
 974    default:
 975       _mesa_problem(ctx,
 976                     "unexpected register file in _mesa_valid_register_index()");
 977       return GL_FALSE;
 978    }
 979 }
 980
 981
 982
 983 /**
 984  * "Post-process" a GPU program.  This is intended to be used for debugging.
 985  * Example actions include no-op'ing instructions or changing instruction
 986  * behaviour.
 987  */
 988 void
 989 _mesa_postprocess_program(struct gl_context *ctx, struct gl_program *prog)
 990 {
 991    static const GLfloat white[4] = { 0.5, 0.5, 0.5, 0.5 };
 992    GLuint i;
 993    GLuint whiteSwizzle;
 994    GLint whiteIndex = _mesa_add_unnamed_constant(prog->Parameters,
 995                                                  (gl_constant_value *) white,
 996                                                  4, &whiteSwizzle);
 997
 998    (void) whiteIndex;
 999
1000    for (i = 0; i < prog->NumInstructions; i++) {
1001       struct prog_instruction *inst = prog->Instructions + i;
1002       const GLuint n = _mesa_num_inst_src_regs(inst->Opcode);
1003
1004       (void) n;
1005
1006       if (_mesa_is_tex_instruction(inst->Opcode)) {
1007 #if 0
1008          /* replace TEX/TXP/TXB with MOV */
1009          inst->Opcode = OPCODE_MOV;
1010          inst->DstReg.WriteMask = WRITEMASK_XYZW;
1011          inst->SrcReg[0].Swizzle = SWIZZLE_XYZW;
1012          inst->SrcReg[0].Negate = NEGATE_NONE;
1013 #endif
1014
1015 #if 0
1016          /* disable shadow texture mode */
1017          inst->TexShadow = 0;
1018 #endif
1019       }
1020
1021       if (inst->Opcode == OPCODE_TXP) {
1022 #if 0
1023          inst->Opcode = OPCODE_MOV;
1024          inst->DstReg.WriteMask = WRITEMASK_XYZW;
1025          inst->SrcReg[0].File = PROGRAM_CONSTANT;
1026          inst->SrcReg[0].Index = whiteIndex;
1027          inst->SrcReg[0].Swizzle = SWIZZLE_XYZW;
1028          inst->SrcReg[0].Negate = NEGATE_NONE;
1029 #endif
1030 #if 0
1031          inst->TexShadow = 0;
1032 #endif
1033 #if 0
1034          inst->Opcode = OPCODE_TEX;
1035          inst->TexShadow = 0;
1036 #endif
1037       }
1038
1039    }
1040 }