src/mesa/program/program.c

   1 /*
   2  * Mesa 3-D graphics library
   3  *
   4  * Copyright (C) 1999-2007  Brian Paul   All Rights Reserved.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the "Software"),
   8  * to deal in the Software without restriction, including without limitation
   9  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  10  * and/or sell copies of the Software, and to permit persons to whom the
  11  * Software is furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included
  14  * in all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  17  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
  20  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  21  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  22  * 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/framebuffer.h"
  35 #include "main/hash.h"
  36 #include "main/macros.h"
  37 #include "program.h"
  38 #include "prog_cache.h"
  39 #include "prog_parameter.h"
  40 #include "prog_instruction.h"
  41 #include "util/ralloc.h"
  42
  43
  44 /**
  45  * A pointer to this dummy program is put into the hash table when
  46  * glGenPrograms is called.
  47  */
  48 struct gl_program _mesa_DummyProgram;
  49
  50
  51 /**
  52  * Init context's vertex/fragment program state
  53  */
  54 void
  55 _mesa_init_program(struct gl_context *ctx)
  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.Program[MESA_SHADER_VERTEX].MaxUniformComponents / 4
  62           <= (1 << INST_INDEX_BITS));
  63    assert(ctx->Const.Program[MESA_SHADER_FRAGMENT].MaxUniformComponents / 4
  64           <= (1 << INST_INDEX_BITS));
  65
  66    assert(ctx->Const.Program[MESA_SHADER_VERTEX].MaxTemps <= (1 << INST_INDEX_BITS));
  67    assert(ctx->Const.Program[MESA_SHADER_VERTEX].MaxLocalParams <= (1 << INST_INDEX_BITS));
  68    assert(ctx->Const.Program[MESA_SHADER_FRAGMENT].MaxTemps <= (1 << INST_INDEX_BITS));
  69    assert(ctx->Const.Program[MESA_SHADER_FRAGMENT].MaxLocalParams <= (1 << INST_INDEX_BITS));
  70
  71    assert(ctx->Const.Program[MESA_SHADER_VERTEX].MaxUniformComponents <= 4 * MAX_UNIFORMS);
  72    assert(ctx->Const.Program[MESA_SHADER_FRAGMENT].MaxUniformComponents <= 4 * MAX_UNIFORMS);
  73
  74    assert(ctx->Const.Program[MESA_SHADER_VERTEX].MaxAddressOffset <= (1 << INST_INDEX_BITS));
  75    assert(ctx->Const.Program[MESA_SHADER_FRAGMENT].MaxAddressOffset <= (1 << INST_INDEX_BITS));
  76
  77    /* If this fails, increase prog_instruction::TexSrcUnit size */
  78    STATIC_ASSERT(MAX_TEXTURE_UNITS <= (1 << 5));
  79
  80    /* If this fails, increase prog_instruction::TexSrcTarget size */
  81    STATIC_ASSERT(NUM_TEXTURE_TARGETS <= (1 << 4));
  82
  83    ctx->Program.ErrorPos = -1;
  84    ctx->Program.ErrorString = strdup("");
  85
  86    ctx->VertexProgram.Enabled = GL_FALSE;
  87    ctx->VertexProgram.PointSizeEnabled =
  88       (ctx->API == API_OPENGLES2) ? GL_TRUE : GL_FALSE;
  89    ctx->VertexProgram.TwoSideEnabled = GL_FALSE;
  90    _mesa_reference_vertprog(ctx, &ctx->VertexProgram.Current,
  91                             ctx->Shared->DefaultVertexProgram);
  92    assert(ctx->VertexProgram.Current);
  93    ctx->VertexProgram.Cache = _mesa_new_program_cache();
  94
  95    ctx->FragmentProgram.Enabled = GL_FALSE;
  96    _mesa_reference_fragprog(ctx, &ctx->FragmentProgram.Current,
  97                             ctx->Shared->DefaultFragmentProgram);
  98    assert(ctx->FragmentProgram.Current);
  99    ctx->FragmentProgram.Cache = _mesa_new_program_cache();
 100
 101    /* XXX probably move this stuff */
 102    ctx->ATIFragmentShader.Enabled = GL_FALSE;
 103    ctx->ATIFragmentShader.Current = ctx->Shared->DefaultFragmentShader;
 104    assert(ctx->ATIFragmentShader.Current);
 105    ctx->ATIFragmentShader.Current->RefCount++;
 106 }
 107
 108
 109 /**
 110  * Free a context's vertex/fragment program state
 111  */
 112 void
 113 _mesa_free_program_data(struct gl_context *ctx)
 114 {
 115    _mesa_reference_vertprog(ctx, &ctx->VertexProgram.Current, NULL);
 116    _mesa_delete_program_cache(ctx, ctx->VertexProgram.Cache);
 117    _mesa_reference_fragprog(ctx, &ctx->FragmentProgram.Current, NULL);
 118    _mesa_delete_shader_cache(ctx, ctx->FragmentProgram.Cache);
 119
 120    /* XXX probably move this stuff */
 121    if (ctx->ATIFragmentShader.Current) {
 122       ctx->ATIFragmentShader.Current->RefCount--;
 123       if (ctx->ATIFragmentShader.Current->RefCount <= 0) {
 124          free(ctx->ATIFragmentShader.Current);
 125       }
 126    }
 127
 128    free((void *) ctx->Program.ErrorString);
 129 }
 130
 131
 132 /**
 133  * Update the default program objects in the given context to reference those
 134  * specified in the shared state and release those referencing the old
 135  * shared state.
 136  */
 137 void
 138 _mesa_update_default_objects_program(struct gl_context *ctx)
 139 {
 140    _mesa_reference_vertprog(ctx, &ctx->VertexProgram.Current,
 141                             ctx->Shared->DefaultVertexProgram);
 142    assert(ctx->VertexProgram.Current);
 143
 144    _mesa_reference_fragprog(ctx, &ctx->FragmentProgram.Current,
 145                             ctx->Shared->DefaultFragmentProgram);
 146    assert(ctx->FragmentProgram.Current);
 147
 148    /* XXX probably move this stuff */
 149    if (ctx->ATIFragmentShader.Current) {
 150       ctx->ATIFragmentShader.Current->RefCount--;
 151       if (ctx->ATIFragmentShader.Current->RefCount <= 0) {
 152          free(ctx->ATIFragmentShader.Current);
 153       }
 154    }
 155    ctx->ATIFragmentShader.Current = (struct ati_fragment_shader *) ctx->Shared->DefaultFragmentShader;
 156    assert(ctx->ATIFragmentShader.Current);
 157    ctx->ATIFragmentShader.Current->RefCount++;
 158 }
 159
 160
 161 /**
 162  * Set the vertex/fragment program error state (position and error string).
 163  * This is generally called from within the parsers.
 164  */
 165 void
 166 _mesa_set_program_error(struct gl_context *ctx, GLint pos, const char *string)
 167 {
 168    ctx->Program.ErrorPos = pos;
 169    free((void *) ctx->Program.ErrorString);
 170    if (!string)
 171       string = "";
 172    ctx->Program.ErrorString = strdup(string);
 173 }
 174
 175
 176 /**
 177  * Initialize a new gl_program object.
 178  */
 179 struct gl_program *
 180 _mesa_init_gl_program(struct gl_program *prog, GLenum target, GLuint id)
 181 {
 182    GLuint i;
 183
 184    if (!prog)
 185       return NULL;
 186
 187    memset(prog, 0, sizeof(*prog));
 188    mtx_init(&prog->Mutex, mtx_plain);
 189    prog->Id = id;
 190    prog->Target = target;
 191    prog->RefCount = 1;
 192    prog->Format = GL_PROGRAM_FORMAT_ASCII_ARB;
 193
 194    /* default mapping from samplers to texture units */
 195    for (i = 0; i < MAX_SAMPLERS; i++)
 196       prog->SamplerUnits[i] = i;
 197
 198    return prog;
 199 }
 200
 201
 202 /**
 203  * Allocate and initialize a new fragment/vertex program object but
 204  * don't put it into the program hash table.  Called via
 205  * ctx->Driver.NewProgram.  May be overridden (ie. replaced) by a
 206  * device driver function to implement OO deriviation with additional
 207  * types not understood by this function.
 208  *
 209  * \param ctx  context
 210  * \param id   program id/number
 211  * \param target  program target/type
 212  * \return  pointer to new program object
 213  */
 214 struct gl_program *
 215 _mesa_new_program(struct gl_context *ctx, GLenum target, GLuint id)
 216 {
 217    switch (target) {
 218    case GL_VERTEX_PROGRAM_ARB: { /* == GL_VERTEX_PROGRAM_NV */
 219       struct gl_vertex_program *prog = CALLOC_STRUCT(gl_vertex_program);
 220       return _mesa_init_gl_program(&prog->Base, target, id);
 221    }
 222    case GL_FRAGMENT_PROGRAM_ARB: {
 223       struct gl_fragment_program *prog = CALLOC_STRUCT(gl_fragment_program);
 224       return _mesa_init_gl_program(&prog->Base, target, id);
 225    }
 226    case GL_GEOMETRY_PROGRAM_NV: {
 227       struct gl_geometry_program *prog = CALLOC_STRUCT(gl_geometry_program);
 228       return _mesa_init_gl_program(&prog->Base, target, id);
 229    }
 230    case GL_TESS_CONTROL_PROGRAM_NV: {
 231       struct gl_program *prog = CALLOC_STRUCT(gl_program);
 232       return _mesa_init_gl_program(prog, target, id);
 233    }
 234    case GL_TESS_EVALUATION_PROGRAM_NV: {
 235       struct gl_tess_eval_program *prog = CALLOC_STRUCT(gl_tess_eval_program);
 236       return _mesa_init_gl_program(&prog->Base, target, id);
 237    }
 238    case GL_COMPUTE_PROGRAM_NV: {
 239       struct gl_compute_program *prog = CALLOC_STRUCT(gl_compute_program);
 240       return _mesa_init_gl_program(&prog->Base, target, id);
 241    }
 242    default:
 243       _mesa_problem(ctx, "bad target in _mesa_new_program");
 244       return NULL;
 245    }
 246 }
 247
 248
 249 /**
 250  * Delete a program and remove it from the hash table, ignoring the
 251  * reference count.
 252  * Called via ctx->Driver.DeleteProgram.  May be wrapped (OO deriviation)
 253  * by a device driver function.
 254  */
 255 void
 256 _mesa_delete_program(struct gl_context *ctx, struct gl_program *prog)
 257 {
 258    (void) ctx;
 259    assert(prog);
 260    assert(prog->RefCount==0);
 261
 262    if (prog == &_mesa_DummyProgram)
 263       return;
 264
 265    free(prog->String);
 266    free(prog->LocalParams);
 267
 268    if (prog->Instructions) {
 269       _mesa_free_instructions(prog->Instructions, prog->NumInstructions);
 270    }
 271    if (prog->Parameters) {
 272       _mesa_free_parameter_list(prog->Parameters);
 273    }
 274
 275    if (prog->nir) {
 276       ralloc_free(prog->nir);
 277    }
 278
 279    mtx_destroy(&prog->Mutex);
 280    free(prog);
 281 }
 282
 283
 284 /**
 285  * Return the gl_program object for a given ID.
 286  * Basically just a wrapper for _mesa_HashLookup() to avoid a lot of
 287  * casts elsewhere.
 288  */
 289 struct gl_program *
 290 _mesa_lookup_program(struct gl_context *ctx, GLuint id)
 291 {
 292    if (id)
 293       return (struct gl_program *) _mesa_HashLookup(ctx->Shared->Programs, id);
 294    else
 295       return NULL;
 296 }
 297
 298
 299 /**
 300  * Reference counting for vertex/fragment programs
 301  * This is normally only called from the _mesa_reference_program() macro
 302  * when there's a real pointer change.
 303  */
 304 void
 305 _mesa_reference_program_(struct gl_context *ctx,
 306                          struct gl_program **ptr,
 307                          struct gl_program *prog)
 308 {
 309 #ifndef NDEBUG
 310    assert(ptr);
 311    if (*ptr && prog) {
 312       /* sanity check */
 313       if ((*ptr)->Target == GL_VERTEX_PROGRAM_ARB)
 314          assert(prog->Target == GL_VERTEX_PROGRAM_ARB);
 315       else if ((*ptr)->Target == GL_FRAGMENT_PROGRAM_ARB)
 316          assert(prog->Target == GL_FRAGMENT_PROGRAM_ARB ||
 317                 prog->Target == GL_FRAGMENT_PROGRAM_NV);
 318       else if ((*ptr)->Target == GL_GEOMETRY_PROGRAM_NV)
 319          assert(prog->Target == GL_GEOMETRY_PROGRAM_NV);
 320    }
 321 #endif
 322
 323    if (*ptr) {
 324       GLboolean deleteFlag;
 325       struct gl_program *oldProg = *ptr;
 326
 327       mtx_lock(&oldProg->Mutex);
 328       assert(oldProg->RefCount > 0);
 329       oldProg->RefCount--;
 330
 331       deleteFlag = (oldProg->RefCount == 0);
 332       mtx_unlock(&oldProg->Mutex);
 333
 334       if (deleteFlag) {
 335          assert(ctx);
 336          ctx->Driver.DeleteProgram(ctx, oldProg);
 337       }
 338
 339       *ptr = NULL;
 340    }
 341
 342    assert(!*ptr);
 343    if (prog) {
 344       mtx_lock(&prog->Mutex);
 345       prog->RefCount++;
 346       mtx_unlock(&prog->Mutex);
 347    }
 348
 349    *ptr = prog;
 350 }
 351
 352
 353 /**
 354  * Insert 'count' NOP instructions at 'start' in the given program.
 355  * Adjust branch targets accordingly.
 356  */
 357 GLboolean
 358 _mesa_insert_instructions(struct gl_program *prog, GLuint start, GLuint count)
 359 {
 360    const GLuint origLen = prog->NumInstructions;
 361    const GLuint newLen = origLen + count;
 362    struct prog_instruction *newInst;
 363    GLuint i;
 364
 365    /* adjust branches */
 366    for (i = 0; i < prog->NumInstructions; i++) {
 367       struct prog_instruction *inst = prog->Instructions + i;
 368       if (inst->BranchTarget > 0) {
 369          if ((GLuint)inst->BranchTarget >= start) {
 370             inst->BranchTarget += count;
 371          }
 372       }
 373    }
 374
 375    /* Alloc storage for new instructions */
 376    newInst = _mesa_alloc_instructions(newLen);
 377    if (!newInst) {
 378       return GL_FALSE;
 379    }
 380
 381    /* Copy 'start' instructions into new instruction buffer */
 382    _mesa_copy_instructions(newInst, prog->Instructions, start);
 383
 384    /* init the new instructions */
 385    _mesa_init_instructions(newInst + start, count);
 386
 387    /* Copy the remaining/tail instructions to new inst buffer */
 388    _mesa_copy_instructions(newInst + start + count,
 389                            prog->Instructions + start,
 390                            origLen - start);
 391
 392    /* free old instructions */
 393    _mesa_free_instructions(prog->Instructions, origLen);
 394
 395    /* install new instructions */
 396    prog->Instructions = newInst;
 397    prog->NumInstructions = newLen;
 398
 399    return GL_TRUE;
 400 }
 401
 402 /**
 403  * Delete 'count' instructions at 'start' in the given program.
 404  * Adjust branch targets accordingly.
 405  */
 406 GLboolean
 407 _mesa_delete_instructions(struct gl_program *prog, GLuint start, GLuint count)
 408 {
 409    const GLuint origLen = prog->NumInstructions;
 410    const GLuint newLen = origLen - count;
 411    struct prog_instruction *newInst;
 412    GLuint i;
 413
 414    /* adjust branches */
 415    for (i = 0; i < prog->NumInstructions; i++) {
 416       struct prog_instruction *inst = prog->Instructions + i;
 417       if (inst->BranchTarget > 0) {
 418          if (inst->BranchTarget > (GLint) start) {
 419             inst->BranchTarget -= count;
 420          }
 421       }
 422    }
 423
 424    /* Alloc storage for new instructions */
 425    newInst = _mesa_alloc_instructions(newLen);
 426    if (!newInst) {
 427       return GL_FALSE;
 428    }
 429
 430    /* Copy 'start' instructions into new instruction buffer */
 431    _mesa_copy_instructions(newInst, prog->Instructions, start);
 432
 433    /* Copy the remaining/tail instructions to new inst buffer */
 434    _mesa_copy_instructions(newInst + start,
 435                            prog->Instructions + start + count,
 436                            newLen - start);
 437
 438    /* free old instructions */
 439    _mesa_free_instructions(prog->Instructions, origLen);
 440
 441    /* install new instructions */
 442    prog->Instructions = newInst;
 443    prog->NumInstructions = newLen;
 444
 445    return GL_TRUE;
 446 }
 447
 448
 449 /**
 450  * Populate the 'used' array with flags indicating which registers (TEMPs,
 451  * INPUTs, OUTPUTs, etc, are used by the given program.
 452  * \param file  type of register to scan for
 453  * \param used  returns true/false flags for in use / free
 454  * \param usedSize  size of the 'used' array
 455  */
 456 void
 457 _mesa_find_used_registers(const struct gl_program *prog,
 458                           gl_register_file file,
 459                           GLboolean used[], GLuint usedSize)
 460 {
 461    GLuint i, j;
 462
 463    memset(used, 0, usedSize);
 464
 465    for (i = 0; i < prog->NumInstructions; i++) {
 466       const struct prog_instruction *inst = prog->Instructions + i;
 467       const GLuint n = _mesa_num_inst_src_regs(inst->Opcode);
 468
 469       if (inst->DstReg.File == file) {
 470          assert(inst->DstReg.Index < usedSize);
 471          if(inst->DstReg.Index < usedSize)
 472             used[inst->DstReg.Index] = GL_TRUE;
 473       }
 474
 475       for (j = 0; j < n; j++) {
 476          if (inst->SrcReg[j].File == file) {
 477             assert(inst->SrcReg[j].Index < (GLint) usedSize);
 478             if (inst->SrcReg[j].Index < (GLint) usedSize)
 479                used[inst->SrcReg[j].Index] = GL_TRUE;
 480          }
 481       }
 482    }
 483 }
 484
 485
 486 /**
 487  * Scan the given 'used' register flag array for the first entry
 488  * that's >= firstReg.
 489  * \param used  vector of flags indicating registers in use (as returned
 490  *              by _mesa_find_used_registers())
 491  * \param usedSize  size of the 'used' array
 492  * \param firstReg  first register to start searching at
 493  * \return index of unused register, or -1 if none.
 494  */
 495 GLint
 496 _mesa_find_free_register(const GLboolean used[],
 497                          GLuint usedSize, GLuint firstReg)
 498 {
 499    GLuint i;
 500
 501    assert(firstReg < usedSize);
 502
 503    for (i = firstReg; i < usedSize; i++)
 504       if (!used[i])
 505          return i;
 506
 507    return -1;
 508 }
 509
 510
 511 /* Gets the minimum number of shader invocations per fragment.
 512  * This function is useful to determine if we need to do per
 513  * sample shading or per fragment shading.
 514  */
 515 GLint
 516 _mesa_get_min_invocations_per_fragment(struct gl_context *ctx,
 517                                        const struct gl_fragment_program *prog,
 518                                        bool ignore_sample_qualifier)
 519 {
 520    /* From ARB_sample_shading specification:
 521     * "Using gl_SampleID in a fragment shader causes the entire shader
 522     *  to be evaluated per-sample."
 523     *
 524     * "Using gl_SamplePosition in a fragment shader causes the entire
 525     *  shader to be evaluated per-sample."
 526     *
 527     * "If MULTISAMPLE or SAMPLE_SHADING_ARB is disabled, sample shading
 528     *  has no effect."
 529     */
 530    if (ctx->Multisample.Enabled) {
 531       /* The ARB_gpu_shader5 specification says:
 532        *
 533        * "Use of the "sample" qualifier on a fragment shader input
 534        *  forces per-sample shading"
 535        */
 536       if (prog->IsSample && !ignore_sample_qualifier)
 537          return MAX2(_mesa_geometric_samples(ctx->DrawBuffer), 1);
 538
 539       if (prog->Base.SystemValuesRead & (SYSTEM_BIT_SAMPLE_ID |
 540                                          SYSTEM_BIT_SAMPLE_POS))
 541          return MAX2(_mesa_geometric_samples(ctx->DrawBuffer), 1);
 542       else if (ctx->Multisample.SampleShading)
 543          return MAX2(ceil(ctx->Multisample.MinSampleShadingValue *
 544                           _mesa_geometric_samples(ctx->DrawBuffer)), 1);
 545       else
 546          return 1;
 547    }
 548    return 1;
 549 }