src/mesa/shader/slang/slang_typeinfo.c

   1 /*
   2  * Mesa 3-D graphics library
   3  * Version:  6.5
   4  *
   5  * Copyright (C) 2005-2006  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 slang_assemble_typeinfo.c
  27  * slang type info
  28  * \author Michal Krol
  29  */
  30
  31 #include "main/imports.h"
  32 #include "shader/prog_instruction.h"
  33 #include "slang_typeinfo.h"
  34 #include "slang_compile.h"
  35 #include "slang_log.h"
  36 #include "slang_mem.h"
  37
  38
  39 /**
  40  * Checks if a field selector is a general swizzle (an r-value swizzle
  41  * with replicated components or an l-value swizzle mask) for a
  42  * vector.  Returns GL_TRUE if this is the case, <swz> is filled with
  43  * swizzle information.  Returns GL_FALSE otherwise.
  44  */
  45 GLboolean
  46 _slang_is_swizzle(const char *field, GLuint rows, slang_swizzle * swz)
  47 {
  48    GLuint i;
  49    GLboolean xyzw = GL_FALSE, rgba = GL_FALSE, stpq = GL_FALSE;
  50
  51    /* init to undefined.
  52     * We rely on undefined/nil values to distinguish between
  53     * regular swizzles and writemasks.
  54     * For example, the swizzle ".xNNN" is the writemask ".x".
  55     * That's different than the swizzle ".xxxx".
  56     */
  57    for (i = 0; i < 4; i++)
  58       swz->swizzle[i] = SWIZZLE_NIL;
  59
  60    /* the swizzle can be at most 4-component long */
  61    swz->num_components = slang_string_length(field);
  62    if (swz->num_components > 4)
  63       return GL_FALSE;
  64
  65    for (i = 0; i < swz->num_components; i++) {
  66       /* mark which swizzle group is used */
  67       switch (field[i]) {
  68       case 'x':
  69       case 'y':
  70       case 'z':
  71       case 'w':
  72          xyzw = GL_TRUE;
  73          break;
  74       case 'r':
  75       case 'g':
  76       case 'b':
  77       case 'a':
  78          rgba = GL_TRUE;
  79          break;
  80       case 's':
  81       case 't':
  82       case 'p':
  83       case 'q':
  84          stpq = GL_TRUE;
  85          break;
  86       default:
  87          return GL_FALSE;
  88       }
  89
  90       /* collect swizzle component */
  91       switch (field[i]) {
  92       case 'x':
  93       case 'r':
  94       case 's':
  95          swz->swizzle[i] = 0;
  96          break;
  97       case 'y':
  98       case 'g':
  99       case 't':
 100          swz->swizzle[i] = 1;
 101          break;
 102       case 'z':
 103       case 'b':
 104       case 'p':
 105          swz->swizzle[i] = 2;
 106          break;
 107       case 'w':
 108       case 'a':
 109       case 'q':
 110          swz->swizzle[i] = 3;
 111          break;
 112       }
 113
 114       /* check if the component is valid for given vector's row count */
 115       if (rows <= swz->swizzle[i])
 116          return GL_FALSE;
 117    }
 118
 119    /* only one swizzle group can be used */
 120    if ((xyzw && rgba) || (xyzw && stpq) || (rgba && stpq))
 121       return GL_FALSE;
 122
 123    return GL_TRUE;
 124 }
 125
 126
 127
 128 /**
 129  * Checks if a general swizzle is an l-value swizzle - these swizzles
 130  * do not have duplicated fields.  Returns GL_TRUE if this is a
 131  * swizzle mask.  Returns GL_FALSE otherwise
 132  */
 133 static GLboolean
 134 _slang_is_swizzle_mask(const slang_swizzle * swz, GLuint rows)
 135 {
 136    GLuint i, c = 0;
 137
 138    /* the swizzle may not be longer than the vector dim */
 139    if (swz->num_components > rows)
 140       return GL_FALSE;
 141
 142    /* the swizzle components cannot be duplicated */
 143    for (i = 0; i < swz->num_components; i++) {
 144       if ((c & (1 << swz->swizzle[i])) != 0)
 145          return GL_FALSE;
 146       c |= 1 << swz->swizzle[i];
 147    }
 148
 149    return GL_TRUE;
 150 }
 151
 152
 153 /**
 154  * Combines (multiplies) two swizzles to form single swizzle.
 155  * Example: "vec.wzyx.yx" --> "vec.zw".
 156  */
 157 static void
 158 _slang_multiply_swizzles(slang_swizzle * dst, const slang_swizzle * left,
 159                          const slang_swizzle * right)
 160 {
 161    GLuint i;
 162
 163    dst->num_components = right->num_components;
 164    for (i = 0; i < right->num_components; i++)
 165       dst->swizzle[i] = left->swizzle[right->swizzle[i]];
 166 }
 167
 168
 169 typedef struct
 170 {
 171    const char *name;
 172    slang_type_specifier_type type;
 173 } type_specifier_type_name;
 174
 175 static const type_specifier_type_name type_specifier_type_names[] = {
 176    {"void", SLANG_SPEC_VOID},
 177    {"bool", SLANG_SPEC_BOOL},
 178    {"bvec2", SLANG_SPEC_BVEC2},
 179    {"bvec3", SLANG_SPEC_BVEC3},
 180    {"bvec4", SLANG_SPEC_BVEC4},
 181    {"int", SLANG_SPEC_INT},
 182    {"ivec2", SLANG_SPEC_IVEC2},
 183    {"ivec3", SLANG_SPEC_IVEC3},
 184    {"ivec4", SLANG_SPEC_IVEC4},
 185    {"float", SLANG_SPEC_FLOAT},
 186    {"vec2", SLANG_SPEC_VEC2},
 187    {"vec3", SLANG_SPEC_VEC3},
 188    {"vec4", SLANG_SPEC_VEC4},
 189    {"mat2", SLANG_SPEC_MAT2},
 190    {"mat3", SLANG_SPEC_MAT3},
 191    {"mat4", SLANG_SPEC_MAT4},
 192    {"mat2x3", SLANG_SPEC_MAT23},
 193    {"mat3x2", SLANG_SPEC_MAT32},
 194    {"mat2x4", SLANG_SPEC_MAT24},
 195    {"mat4x2", SLANG_SPEC_MAT42},
 196    {"mat3x4", SLANG_SPEC_MAT34},
 197    {"mat4x3", SLANG_SPEC_MAT43},
 198    {"sampler1D", SLANG_SPEC_SAMPLER1D},
 199    {"sampler2D", SLANG_SPEC_SAMPLER2D},
 200    {"sampler3D", SLANG_SPEC_SAMPLER3D},
 201    {"samplerCube", SLANG_SPEC_SAMPLERCUBE},
 202    {"sampler1DShadow", SLANG_SPEC_SAMPLER1DSHADOW},
 203    {"sampler2DShadow", SLANG_SPEC_SAMPLER2DSHADOW},
 204    {"sampler2DRect", SLANG_SPEC_SAMPLER2DRECT},
 205    {"sampler2DRectShadow", SLANG_SPEC_SAMPLER2DRECTSHADOW},
 206    {NULL, SLANG_SPEC_VOID}
 207 };
 208
 209 slang_type_specifier_type
 210 slang_type_specifier_type_from_string(const char *name)
 211 {
 212    const type_specifier_type_name *p = type_specifier_type_names;
 213    while (p->name != NULL) {
 214       if (slang_string_compare(p->name, name) == 0)
 215          break;
 216       p++;
 217    }
 218    return p->type;
 219 }
 220
 221 const char *
 222 slang_type_specifier_type_to_string(slang_type_specifier_type type)
 223 {
 224    const type_specifier_type_name *p = type_specifier_type_names;
 225    while (p->name != NULL) {
 226       if (p->type == type)
 227          break;
 228       p++;
 229    }
 230    return p->name;
 231 }
 232
 233 /* slang_fully_specified_type */
 234
 235 int
 236 slang_fully_specified_type_construct(slang_fully_specified_type * type)
 237 {
 238    type->qualifier = SLANG_QUAL_NONE;
 239    slang_type_specifier_ctr(&type->specifier);
 240    return 1;
 241 }
 242
 243 void
 244 slang_fully_specified_type_destruct(slang_fully_specified_type * type)
 245 {
 246    slang_type_specifier_dtr(&type->specifier);
 247 }
 248
 249 int
 250 slang_fully_specified_type_copy(slang_fully_specified_type * x,
 251                                 const slang_fully_specified_type * y)
 252 {
 253    slang_fully_specified_type z;
 254
 255    if (!slang_fully_specified_type_construct(&z))
 256       return 0;
 257    z.qualifier = y->qualifier;
 258    z.precision = y->precision;
 259    z.variant = y->variant;
 260    z.centroid = y->centroid;
 261    if (!slang_type_specifier_copy(&z.specifier, &y->specifier)) {
 262       slang_fully_specified_type_destruct(&z);
 263       return 0;
 264    }
 265    slang_fully_specified_type_destruct(x);
 266    *x = z;
 267    return 1;
 268 }
 269
 270
 271
 272 GLvoid
 273 slang_type_specifier_ctr(slang_type_specifier * self)
 274 {
 275    self->type = SLANG_SPEC_VOID;
 276    self->_struct = NULL;
 277    self->_array = NULL;
 278 }
 279
 280 GLvoid
 281 slang_type_specifier_dtr(slang_type_specifier * self)
 282 {
 283    if (self->_struct != NULL) {
 284       slang_struct_destruct(self->_struct);
 285       _slang_free(self->_struct);
 286    }
 287    if (self->_array != NULL) {
 288       slang_type_specifier_dtr(self->_array);
 289       _slang_free(self->_array);
 290    }
 291 }
 292
 293 slang_type_specifier *
 294 slang_type_specifier_new(slang_type_specifier_type type,
 295                          struct slang_struct_ *_struct,
 296                          struct slang_type_specifier_ *_array)
 297 {
 298    slang_type_specifier *spec =
 299       (slang_type_specifier *) _mesa_malloc(sizeof(slang_type_specifier));
 300    if (spec) {
 301       spec->type = type;
 302       spec->_struct = _struct;
 303       spec->_array = _array;
 304    }
 305    return spec;
 306 }
 307
 308 GLboolean
 309 slang_type_specifier_copy(slang_type_specifier * x,
 310                           const slang_type_specifier * y)
 311 {
 312    slang_type_specifier z;
 313
 314    slang_type_specifier_ctr(&z);
 315    z.type = y->type;
 316    if (z.type == SLANG_SPEC_STRUCT) {
 317       z._struct = (slang_struct *) _slang_alloc(sizeof(slang_struct));
 318       if (z._struct == NULL) {
 319          slang_type_specifier_dtr(&z);
 320          return GL_FALSE;
 321       }
 322       if (!slang_struct_construct(z._struct)) {
 323          _slang_free(z._struct);
 324          slang_type_specifier_dtr(&z);
 325          return GL_FALSE;
 326       }
 327       if (!slang_struct_copy(z._struct, y->_struct)) {
 328          slang_type_specifier_dtr(&z);
 329          return GL_FALSE;
 330       }
 331    }
 332    else if (z.type == SLANG_SPEC_ARRAY) {
 333       z._array = (slang_type_specifier *)
 334          _slang_alloc(sizeof(slang_type_specifier));
 335       if (z._array == NULL) {
 336          slang_type_specifier_dtr(&z);
 337          return GL_FALSE;
 338       }
 339       slang_type_specifier_ctr(z._array);
 340       if (!slang_type_specifier_copy(z._array, y->_array)) {
 341          slang_type_specifier_dtr(&z);
 342          return GL_FALSE;
 343       }
 344    }
 345    slang_type_specifier_dtr(x);
 346    *x = z;
 347    return GL_TRUE;
 348 }
 349
 350
 351 /**
 352  * Test if two types are equal.
 353  */
 354 GLboolean
 355 slang_type_specifier_equal(const slang_type_specifier * x,
 356                            const slang_type_specifier * y)
 357 {
 358    if (x->type != y->type)
 359       return GL_FALSE;
 360    if (x->type == SLANG_SPEC_STRUCT)
 361       return slang_struct_equal(x->_struct, y->_struct);
 362    if (x->type == SLANG_SPEC_ARRAY)
 363       return slang_type_specifier_equal(x->_array, y->_array);
 364    return GL_TRUE;
 365 }
 366
 367
 368 /**
 369  * As above, but allow float/int casting.
 370  */
 371 GLboolean
 372 slang_type_specifier_compatible(const slang_type_specifier * x,
 373                                 const slang_type_specifier * y)
 374 {
 375    /* special case: float == int */
 376    if (x->type == SLANG_SPEC_INT && y->type == SLANG_SPEC_FLOAT) {
 377       return GL_TRUE;
 378    }
 379    /* XXX may need to add bool/int compatibility, etc */
 380
 381    if (x->type != y->type)
 382       return GL_FALSE;
 383    if (x->type == SLANG_SPEC_STRUCT)
 384       return slang_struct_equal(x->_struct, y->_struct);
 385    if (x->type == SLANG_SPEC_ARRAY)
 386       return slang_type_specifier_compatible(x->_array, y->_array);
 387    return GL_TRUE;
 388 }
 389
 390
 391 GLboolean
 392 slang_typeinfo_construct(slang_typeinfo * ti)
 393 {
 394    _mesa_bzero(ti, sizeof(*ti));
 395    slang_type_specifier_ctr(&ti->spec);
 396    ti->array_len = 0;
 397    return GL_TRUE;
 398 }
 399
 400 GLvoid
 401 slang_typeinfo_destruct(slang_typeinfo * ti)
 402 {
 403    slang_type_specifier_dtr(&ti->spec);
 404 }
 405
 406
 407
 408 /**
 409  * Determine the return type of a function.
 410  * \param a_name  the function name
 411  * \param param  function parameters (overloading)
 412  * \param num_params  number of parameters to function
 413  * \param space  namespace to search
 414  * \param spec  returns the type
 415  * \param funFound  returns pointer to the function, or NULL if not found.
 416  * \return GL_TRUE for success, GL_FALSE if failure (bad function name)
 417  */
 418 static GLboolean
 419 _slang_typeof_function(slang_atom a_name,
 420                        slang_operation * params, GLuint num_params,
 421                        const slang_name_space * space,
 422                        slang_type_specifier * spec,
 423                        slang_function **funFound,
 424                        slang_atom_pool *atoms, slang_info_log *log)
 425 {
 426    GLboolean error;
 427
 428    *funFound = _slang_locate_function(space->funcs, a_name, params,
 429                                       num_params, space, atoms, log, &error);
 430    if (error)
 431       return GL_FALSE;
 432
 433    if (!*funFound)
 434       return GL_TRUE;  /* yes, not false */
 435
 436    return slang_type_specifier_copy(spec, &(*funFound)->header.type.specifier);
 437 }
 438
 439
 440 /**
 441  * Determine the type of a math function.
 442  * \param name  name of the operator, one of +,-,*,/ or unary -
 443  * \param params  array of function parameters
 444  * \param num_params  number of parameters
 445  * \param space  namespace to use
 446  * \param spec  returns the function's type
 447  * \param atoms  atom pool
 448  * \return GL_TRUE for success, GL_FALSE if failure
 449  */
 450 static GLboolean
 451 typeof_math_call(const char *name, slang_operation *call,
 452                  const slang_name_space * space,
 453                  slang_type_specifier * spec,
 454                  slang_atom_pool * atoms,
 455                  slang_info_log *log)
 456 {
 457    if (call->fun) {
 458       /* we've previously resolved this function call */
 459       slang_type_specifier_copy(spec, &call->fun->header.type.specifier);
 460       return GL_TRUE;
 461    }
 462    else {
 463       slang_atom atom;
 464       slang_function *fun;
 465
 466       /* number of params: */
 467       assert(call->num_children == 1 || call->num_children == 2);
 468
 469       atom = slang_atom_pool_atom(atoms, name);
 470       if (!_slang_typeof_function(atom, call->children, call->num_children,
 471                                   space, spec, &fun, atoms, log))
 472          return GL_FALSE;
 473
 474       if (fun) {
 475          /* Save pointer to save time in future */
 476          call->fun = fun;
 477          return GL_TRUE;
 478       }
 479       return GL_FALSE;
 480    }
 481 }
 482
 483
 484 /**
 485  * Determine the return type of an operation.
 486  * \param op  the operation node
 487  * \param space  the namespace to use
 488  * \param ti  the returned type
 489  * \param atoms  atom pool
 490  * \return GL_TRUE for success, GL_FALSE if failure
 491  */
 492 GLboolean
 493 _slang_typeof_operation_(slang_operation * op,
 494                          const slang_name_space * space,
 495                          slang_typeinfo * ti,
 496                          slang_atom_pool * atoms,
 497                          slang_info_log *log)
 498 {
 499    ti->can_be_referenced = GL_FALSE;
 500    ti->is_swizzled = GL_FALSE;
 501
 502    switch (op->type) {
 503    case SLANG_OPER_BLOCK_NO_NEW_SCOPE:
 504    case SLANG_OPER_BLOCK_NEW_SCOPE:
 505    case SLANG_OPER_ASM:
 506    case SLANG_OPER_BREAK:
 507    case SLANG_OPER_CONTINUE:
 508    case SLANG_OPER_DISCARD:
 509    case SLANG_OPER_RETURN:
 510    case SLANG_OPER_IF:
 511    case SLANG_OPER_WHILE:
 512    case SLANG_OPER_DO:
 513    case SLANG_OPER_FOR:
 514    case SLANG_OPER_VOID:
 515       ti->spec.type = SLANG_SPEC_VOID;
 516       break;
 517    case SLANG_OPER_EXPRESSION:
 518    case SLANG_OPER_ASSIGN:
 519    case SLANG_OPER_ADDASSIGN:
 520    case SLANG_OPER_SUBASSIGN:
 521    case SLANG_OPER_MULASSIGN:
 522    case SLANG_OPER_DIVASSIGN:
 523    case SLANG_OPER_PREINCREMENT:
 524    case SLANG_OPER_PREDECREMENT:
 525       if (!_slang_typeof_operation_(op->children, space, ti, atoms, log))
 526          return GL_FALSE;
 527       break;
 528    case SLANG_OPER_LITERAL_BOOL:
 529       if (op->literal_size == 1)
 530          ti->spec.type = SLANG_SPEC_BOOL;
 531       else if (op->literal_size == 2)
 532          ti->spec.type = SLANG_SPEC_BVEC2;
 533       else if (op->literal_size == 3)
 534          ti->spec.type = SLANG_SPEC_BVEC3;
 535       else if (op->literal_size == 4)
 536          ti->spec.type = SLANG_SPEC_BVEC4;
 537       else {
 538          _mesa_problem(NULL,
 539                "Unexpected bool literal_size %d in _slang_typeof_operation()",
 540                op->literal_size);
 541          ti->spec.type = SLANG_SPEC_BOOL;
 542       }
 543       break;
 544    case SLANG_OPER_LOGICALOR:
 545    case SLANG_OPER_LOGICALXOR:
 546    case SLANG_OPER_LOGICALAND:
 547    case SLANG_OPER_EQUAL:
 548    case SLANG_OPER_NOTEQUAL:
 549    case SLANG_OPER_LESS:
 550    case SLANG_OPER_GREATER:
 551    case SLANG_OPER_LESSEQUAL:
 552    case SLANG_OPER_GREATEREQUAL:
 553    case SLANG_OPER_NOT:
 554       ti->spec.type = SLANG_SPEC_BOOL;
 555       break;
 556    case SLANG_OPER_LITERAL_INT:
 557       if (op->literal_size == 1)
 558          ti->spec.type = SLANG_SPEC_INT;
 559       else if (op->literal_size == 2)
 560          ti->spec.type = SLANG_SPEC_IVEC2;
 561       else if (op->literal_size == 3)
 562          ti->spec.type = SLANG_SPEC_IVEC3;
 563       else if (op->literal_size == 4)
 564          ti->spec.type = SLANG_SPEC_IVEC4;
 565       else {
 566          _mesa_problem(NULL,
 567                "Unexpected int literal_size %d in _slang_typeof_operation()",
 568                op->literal_size);
 569          ti->spec.type = SLANG_SPEC_INT;
 570       }
 571       break;
 572    case SLANG_OPER_LITERAL_FLOAT:
 573       if (op->literal_size == 1)
 574          ti->spec.type = SLANG_SPEC_FLOAT;
 575       else if (op->literal_size == 2)
 576          ti->spec.type = SLANG_SPEC_VEC2;
 577       else if (op->literal_size == 3)
 578          ti->spec.type = SLANG_SPEC_VEC3;
 579       else if (op->literal_size == 4)
 580          ti->spec.type = SLANG_SPEC_VEC4;
 581       else {
 582          _mesa_problem(NULL,
 583                "Unexpected float literal_size %d in _slang_typeof_operation()",
 584                op->literal_size);
 585          ti->spec.type = SLANG_SPEC_FLOAT;
 586       }
 587       break;
 588    case SLANG_OPER_IDENTIFIER:
 589    case SLANG_OPER_VARIABLE_DECL:
 590       {
 591          slang_variable *var;
 592          var = _slang_locate_variable(op->locals, op->a_id, GL_TRUE);
 593          if (!var) {
 594             slang_info_log_error(log, "undefined variable '%s'",
 595                                  (char *) op->a_id);
 596             return GL_FALSE;
 597          }
 598          if (!slang_type_specifier_copy(&ti->spec, &var->type.specifier)) {
 599             slang_info_log_memory(log);
 600             return GL_FALSE;
 601          }
 602          ti->can_be_referenced = GL_TRUE;
 603          ti->array_len = var->array_len;
 604       }
 605       break;
 606    case SLANG_OPER_SEQUENCE:
 607       /* TODO: check [0] and [1] if they match */
 608       if (!_slang_typeof_operation_(&op->children[1], space, ti, atoms, log)) {
 609          return GL_FALSE;
 610       }
 611       ti->can_be_referenced = GL_FALSE;
 612       ti->is_swizzled = GL_FALSE;
 613       break;
 614       /*case SLANG_OPER_MODASSIGN: */
 615       /*case SLANG_OPER_LSHASSIGN: */
 616       /*case SLANG_OPER_RSHASSIGN: */
 617       /*case SLANG_OPER_ORASSIGN: */
 618       /*case SLANG_OPER_XORASSIGN: */
 619       /*case SLANG_OPER_ANDASSIGN: */
 620    case SLANG_OPER_SELECT:
 621       /* TODO: check [1] and [2] if they match */
 622       if (!_slang_typeof_operation_(&op->children[1], space, ti, atoms, log)) {
 623          return GL_FALSE;
 624       }
 625       ti->can_be_referenced = GL_FALSE;
 626       ti->is_swizzled = GL_FALSE;
 627       break;
 628       /*case SLANG_OPER_BITOR: */
 629       /*case SLANG_OPER_BITXOR: */
 630       /*case SLANG_OPER_BITAND: */
 631       /*case SLANG_OPER_LSHIFT: */
 632       /*case SLANG_OPER_RSHIFT: */
 633    case SLANG_OPER_ADD:
 634       assert(op->num_children == 2);
 635       if (!typeof_math_call("+", op, space, &ti->spec, atoms, log))
 636          return GL_FALSE;
 637       break;
 638    case SLANG_OPER_SUBTRACT:
 639       assert(op->num_children == 2);
 640       if (!typeof_math_call("-", op, space, &ti->spec, atoms, log))
 641          return GL_FALSE;
 642       break;
 643    case SLANG_OPER_MULTIPLY:
 644       assert(op->num_children == 2);
 645       if (!typeof_math_call("*", op, space, &ti->spec, atoms, log))
 646          return GL_FALSE;
 647       break;
 648    case SLANG_OPER_DIVIDE:
 649       assert(op->num_children == 2);
 650       if (!typeof_math_call("/", op, space, &ti->spec, atoms, log))
 651          return GL_FALSE;
 652       break;
 653    /*case SLANG_OPER_MODULUS: */
 654    case SLANG_OPER_PLUS:
 655       if (!_slang_typeof_operation_(op->children, space, ti, atoms, log))
 656          return GL_FALSE;
 657       ti->can_be_referenced = GL_FALSE;
 658       ti->is_swizzled = GL_FALSE;
 659       break;
 660    case SLANG_OPER_MINUS:
 661       assert(op->num_children == 1);
 662       if (!typeof_math_call("-", op, space, &ti->spec, atoms, log))
 663          return GL_FALSE;
 664       break;
 665       /*case SLANG_OPER_COMPLEMENT: */
 666    case SLANG_OPER_SUBSCRIPT:
 667       {
 668          slang_typeinfo _ti;
 669
 670          if (!slang_typeinfo_construct(&_ti))
 671             return GL_FALSE;
 672          if (!_slang_typeof_operation_(op->children, space, &_ti, atoms, log)) {
 673             slang_typeinfo_destruct(&_ti);
 674             return GL_FALSE;
 675          }
 676          ti->can_be_referenced = _ti.can_be_referenced;
 677          if (_ti.spec.type == SLANG_SPEC_ARRAY) {
 678             if (!slang_type_specifier_copy(&ti->spec, _ti.spec._array)) {
 679                slang_typeinfo_destruct(&_ti);
 680                return GL_FALSE;
 681             }
 682          }
 683          else {
 684             if (!_slang_type_is_vector(_ti.spec.type)
 685                 && !_slang_type_is_matrix(_ti.spec.type)) {
 686                slang_typeinfo_destruct(&_ti);
 687                slang_info_log_error(log, "cannot index a non-array type");
 688                return GL_FALSE;
 689             }
 690             ti->spec.type = _slang_type_base(_ti.spec.type);
 691          }
 692          slang_typeinfo_destruct(&_ti);
 693       }
 694       break;
 695    case SLANG_OPER_CALL:
 696       if (op->array_constructor) {
 697          /* build array typeinfo */
 698          ti->spec.type = SLANG_SPEC_ARRAY;
 699          ti->spec._array = (slang_type_specifier *)
 700             _slang_alloc(sizeof(slang_type_specifier));
 701          slang_type_specifier_ctr(ti->spec._array);
 702
 703          ti->spec._array->type =
 704             slang_type_specifier_type_from_string((char *) op->a_id);
 705          ti->array_len = op->num_children;
 706       }
 707       else if (op->fun) {
 708          /* we've resolved this call before */
 709          slang_type_specifier_copy(&ti->spec, &op->fun->header.type.specifier);
 710       }
 711       else {
 712          slang_function *fun;
 713          if (!_slang_typeof_function(op->a_id, op->children, op->num_children,
 714                                      space, &ti->spec, &fun, atoms, log))
 715             return GL_FALSE;
 716          if (fun) {
 717             /* save result for future use */
 718             op->fun = fun;
 719          }
 720          else {
 721             slang_struct *s =
 722                slang_struct_scope_find(space->structs, op->a_id, GL_TRUE);
 723             if (s) {
 724                /* struct initializer */
 725                ti->spec.type = SLANG_SPEC_STRUCT;
 726                ti->spec._struct =
 727                   (slang_struct *) _slang_alloc(sizeof(slang_struct));
 728                if (ti->spec._struct == NULL)
 729                   return GL_FALSE;
 730                if (!slang_struct_construct(ti->spec._struct)) {
 731                   _slang_free(ti->spec._struct);
 732                   ti->spec._struct = NULL;
 733                   return GL_FALSE;
 734                }
 735                if (!slang_struct_copy(ti->spec._struct, s))
 736                   return GL_FALSE;
 737             }
 738             else {
 739                /* float, int, vec4, mat3, etc. constructor? */
 740                const char *name;
 741                slang_type_specifier_type type;
 742
 743                name = slang_atom_pool_id(atoms, op->a_id);
 744                type = slang_type_specifier_type_from_string(name);
 745                if (type == SLANG_SPEC_VOID) {
 746                   slang_info_log_error(log, "undefined function '%s'", name);
 747                   return GL_FALSE;
 748                }
 749                ti->spec.type = type;
 750             }
 751          }
 752       }
 753       break;
 754    case SLANG_OPER_METHOD:
 755       /* at this time, GLSL 1.20 only has one method: array.length()
 756        * which returns an integer.
 757        */
 758       ti->spec.type = SLANG_SPEC_INT;
 759       break;
 760    case SLANG_OPER_FIELD:
 761       {
 762          slang_typeinfo _ti;
 763
 764          if (!slang_typeinfo_construct(&_ti))
 765             return GL_FALSE;
 766          if (!_slang_typeof_operation_(op->children, space, &_ti, atoms, log)) {
 767             slang_typeinfo_destruct(&_ti);
 768             return GL_FALSE;
 769          }
 770          if (_ti.spec.type == SLANG_SPEC_STRUCT) {
 771             slang_variable *field;
 772
 773             field = _slang_locate_variable(_ti.spec._struct->fields, op->a_id,
 774                                            GL_FALSE);
 775             if (field == NULL) {
 776                slang_typeinfo_destruct(&_ti);
 777                return GL_FALSE;
 778             }
 779             if (!slang_type_specifier_copy(&ti->spec, &field->type.specifier)) {
 780                slang_typeinfo_destruct(&_ti);
 781                return GL_FALSE;
 782             }
 783             ti->can_be_referenced = _ti.can_be_referenced;
 784          }
 785          else {
 786             GLuint rows;
 787             const char *swizzle;
 788             slang_type_specifier_type base;
 789
 790             /* determine the swizzle of the field expression */
 791             if (!_slang_type_is_vector(_ti.spec.type)) {
 792                slang_typeinfo_destruct(&_ti);
 793                slang_info_log_error(log, "Can't swizzle scalar expression");
 794                return GL_FALSE;
 795             }
 796             rows = _slang_type_dim(_ti.spec.type);
 797             swizzle = slang_atom_pool_id(atoms, op->a_id);
 798             if (!_slang_is_swizzle(swizzle, rows, &ti->swz)) {
 799                slang_typeinfo_destruct(&_ti);
 800                slang_info_log_error(log, "bad swizzle '%s'", swizzle);
 801                return GL_FALSE;
 802             }
 803             ti->is_swizzled = GL_TRUE;
 804             ti->can_be_referenced = _ti.can_be_referenced
 805                && _slang_is_swizzle_mask(&ti->swz, rows);
 806             if (_ti.is_swizzled) {
 807                slang_swizzle swz;
 808
 809                /* swizzle the swizzle */
 810                _slang_multiply_swizzles(&swz, &_ti.swz, &ti->swz);
 811                ti->swz = swz;
 812             }
 813             base = _slang_type_base(_ti.spec.type);
 814             switch (ti->swz.num_components) {
 815             case 1:
 816                ti->spec.type = base;
 817                break;
 818             case 2:
 819                switch (base) {
 820                case SLANG_SPEC_FLOAT:
 821                   ti->spec.type = SLANG_SPEC_VEC2;
 822                   break;
 823                case SLANG_SPEC_INT:
 824                   ti->spec.type = SLANG_SPEC_IVEC2;
 825                   break;
 826                case SLANG_SPEC_BOOL:
 827                   ti->spec.type = SLANG_SPEC_BVEC2;
 828                   break;
 829                default:
 830                   break;
 831                }
 832                break;
 833             case 3:
 834                switch (base) {
 835                case SLANG_SPEC_FLOAT:
 836                   ti->spec.type = SLANG_SPEC_VEC3;
 837                   break;
 838                case SLANG_SPEC_INT:
 839                   ti->spec.type = SLANG_SPEC_IVEC3;
 840                   break;
 841                case SLANG_SPEC_BOOL:
 842                   ti->spec.type = SLANG_SPEC_BVEC3;
 843                   break;
 844                default:
 845                   break;
 846                }
 847                break;
 848             case 4:
 849                switch (base) {
 850                case SLANG_SPEC_FLOAT:
 851                   ti->spec.type = SLANG_SPEC_VEC4;
 852                   break;
 853                case SLANG_SPEC_INT:
 854                   ti->spec.type = SLANG_SPEC_IVEC4;
 855                   break;
 856                case SLANG_SPEC_BOOL:
 857                   ti->spec.type = SLANG_SPEC_BVEC4;
 858                   break;
 859                default:
 860                   break;
 861                }
 862                break;
 863             default:
 864                break;
 865             }
 866          }
 867          slang_typeinfo_destruct(&_ti);
 868       }
 869       break;
 870    case SLANG_OPER_POSTINCREMENT:
 871    case SLANG_OPER_POSTDECREMENT:
 872       if (!_slang_typeof_operation_(op->children, space, ti, atoms, log))
 873          return GL_FALSE;
 874       ti->can_be_referenced = GL_FALSE;
 875       ti->is_swizzled = GL_FALSE;
 876       break;
 877    default:
 878       return GL_FALSE;
 879    }
 880
 881    return GL_TRUE;
 882 }
 883
 884
 885 /**
 886  * Determine if a type is a matrix.
 887  * \return GL_TRUE if is a matrix, GL_FALSE otherwise.
 888  */
 889 GLboolean
 890 _slang_type_is_matrix(slang_type_specifier_type ty)
 891 {
 892    switch (ty) {
 893    case SLANG_SPEC_MAT2:
 894    case SLANG_SPEC_MAT3:
 895    case SLANG_SPEC_MAT4:
 896    case SLANG_SPEC_MAT23:
 897    case SLANG_SPEC_MAT32:
 898    case SLANG_SPEC_MAT24:
 899    case SLANG_SPEC_MAT42:
 900    case SLANG_SPEC_MAT34:
 901    case SLANG_SPEC_MAT43:
 902       return GL_TRUE;
 903    default:
 904       return GL_FALSE;
 905    }
 906 }
 907
 908
 909 /**
 910  * Determine if a type is a vector.
 911  * \return GL_TRUE if is a vector, GL_FALSE otherwise.
 912  */
 913 GLboolean
 914 _slang_type_is_vector(slang_type_specifier_type ty)
 915 {
 916    switch (ty) {
 917    case SLANG_SPEC_VEC2:
 918    case SLANG_SPEC_VEC3:
 919    case SLANG_SPEC_VEC4:
 920    case SLANG_SPEC_IVEC2:
 921    case SLANG_SPEC_IVEC3:
 922    case SLANG_SPEC_IVEC4:
 923    case SLANG_SPEC_BVEC2:
 924    case SLANG_SPEC_BVEC3:
 925    case SLANG_SPEC_BVEC4:
 926       return GL_TRUE;
 927    default:
 928       return GL_FALSE;
 929    }
 930 }
 931
 932
 933 /**
 934  * Determine if a type is a float, float vector or float matrix.
 935  * \return GL_TRUE if so, GL_FALSE otherwise
 936  */
 937 GLboolean
 938 _slang_type_is_float_vec_mat(slang_type_specifier_type ty)
 939 {
 940    switch (ty) {
 941    case SLANG_SPEC_FLOAT:
 942    case SLANG_SPEC_VEC2:
 943    case SLANG_SPEC_VEC3:
 944    case SLANG_SPEC_VEC4:
 945    case SLANG_SPEC_MAT2:
 946    case SLANG_SPEC_MAT3:
 947    case SLANG_SPEC_MAT4:
 948    case SLANG_SPEC_MAT23:
 949    case SLANG_SPEC_MAT32:
 950    case SLANG_SPEC_MAT24:
 951    case SLANG_SPEC_MAT42:
 952    case SLANG_SPEC_MAT34:
 953    case SLANG_SPEC_MAT43:
 954       return GL_TRUE;
 955    default:
 956       return GL_FALSE;
 957    }
 958 }
 959
 960
 961 /**
 962  * Given a vector type, return the type of the vector's elements.
 963  * For a matrix, return the type of the columns.
 964  */
 965 slang_type_specifier_type
 966 _slang_type_base(slang_type_specifier_type ty)
 967 {
 968    switch (ty) {
 969    case SLANG_SPEC_FLOAT:
 970    case SLANG_SPEC_VEC2:
 971    case SLANG_SPEC_VEC3:
 972    case SLANG_SPEC_VEC4:
 973       return SLANG_SPEC_FLOAT;
 974    case SLANG_SPEC_INT:
 975    case SLANG_SPEC_IVEC2:
 976    case SLANG_SPEC_IVEC3:
 977    case SLANG_SPEC_IVEC4:
 978       return SLANG_SPEC_INT;
 979    case SLANG_SPEC_BOOL:
 980    case SLANG_SPEC_BVEC2:
 981    case SLANG_SPEC_BVEC3:
 982    case SLANG_SPEC_BVEC4:
 983       return SLANG_SPEC_BOOL;
 984    case SLANG_SPEC_MAT2:
 985       return SLANG_SPEC_VEC2;
 986    case SLANG_SPEC_MAT3:
 987       return SLANG_SPEC_VEC3;
 988    case SLANG_SPEC_MAT4:
 989       return SLANG_SPEC_VEC4;
 990    case SLANG_SPEC_MAT23:
 991       return SLANG_SPEC_VEC3;
 992    case SLANG_SPEC_MAT32:
 993       return SLANG_SPEC_VEC2;
 994    case SLANG_SPEC_MAT24:
 995       return SLANG_SPEC_VEC4;
 996    case SLANG_SPEC_MAT42:
 997       return SLANG_SPEC_VEC2;
 998    case SLANG_SPEC_MAT34:
 999       return SLANG_SPEC_VEC4;
1000    case SLANG_SPEC_MAT43:
1001       return SLANG_SPEC_VEC3;
1002    default:
1003       return SLANG_SPEC_VOID;
1004    }
1005 }
1006
1007
1008 /**
1009  * Return the dimensionality of a vector, or for a matrix, return number
1010  * of columns.
1011  */
1012 GLuint
1013 _slang_type_dim(slang_type_specifier_type ty)
1014 {
1015    switch (ty) {
1016    case SLANG_SPEC_FLOAT:
1017    case SLANG_SPEC_INT:
1018    case SLANG_SPEC_BOOL:
1019       return 1;
1020    case SLANG_SPEC_VEC2:
1021    case SLANG_SPEC_IVEC2:
1022    case SLANG_SPEC_BVEC2:
1023    case SLANG_SPEC_MAT2:
1024       return 2;
1025    case SLANG_SPEC_VEC3:
1026    case SLANG_SPEC_IVEC3:
1027    case SLANG_SPEC_BVEC3:
1028    case SLANG_SPEC_MAT3:
1029       return 3;
1030    case SLANG_SPEC_VEC4:
1031    case SLANG_SPEC_IVEC4:
1032    case SLANG_SPEC_BVEC4:
1033    case SLANG_SPEC_MAT4:
1034       return 4;
1035
1036    case SLANG_SPEC_MAT23:
1037       return 2;
1038    case SLANG_SPEC_MAT32:
1039       return 3;
1040    case SLANG_SPEC_MAT24:
1041       return 2;
1042    case SLANG_SPEC_MAT42:
1043       return 4;
1044    case SLANG_SPEC_MAT34:
1045       return 3;
1046    case SLANG_SPEC_MAT43:
1047       return 4;
1048
1049    default:
1050       return 0;
1051    }
1052 }
1053
1054
1055 /**
1056  * Return the GL_* type that corresponds to a SLANG_SPEC_* type.
1057  */
1058 GLenum
1059 _slang_gltype_from_specifier(const slang_type_specifier *type)
1060 {
1061    switch (type->type) {
1062    case SLANG_SPEC_BOOL:
1063       return GL_BOOL;
1064    case SLANG_SPEC_BVEC2:
1065       return GL_BOOL_VEC2;
1066    case SLANG_SPEC_BVEC3:
1067       return GL_BOOL_VEC3;
1068    case SLANG_SPEC_BVEC4:
1069       return GL_BOOL_VEC4;
1070    case SLANG_SPEC_INT:
1071       return GL_INT;
1072    case SLANG_SPEC_IVEC2:
1073       return GL_INT_VEC2;
1074    case SLANG_SPEC_IVEC3:
1075       return GL_INT_VEC3;
1076    case SLANG_SPEC_IVEC4:
1077       return GL_INT_VEC4;
1078    case SLANG_SPEC_FLOAT:
1079       return GL_FLOAT;
1080    case SLANG_SPEC_VEC2:
1081       return GL_FLOAT_VEC2;
1082    case SLANG_SPEC_VEC3:
1083       return GL_FLOAT_VEC3;
1084    case SLANG_SPEC_VEC4:
1085       return GL_FLOAT_VEC4;
1086    case SLANG_SPEC_MAT2:
1087       return GL_FLOAT_MAT2;
1088    case SLANG_SPEC_MAT3:
1089       return GL_FLOAT_MAT3;
1090    case SLANG_SPEC_MAT4:
1091       return GL_FLOAT_MAT4;
1092    case SLANG_SPEC_MAT23:
1093       return GL_FLOAT_MAT2x3;
1094    case SLANG_SPEC_MAT32:
1095       return GL_FLOAT_MAT3x2;
1096    case SLANG_SPEC_MAT24:
1097       return GL_FLOAT_MAT2x4;
1098    case SLANG_SPEC_MAT42:
1099       return GL_FLOAT_MAT4x2;
1100    case SLANG_SPEC_MAT34:
1101       return GL_FLOAT_MAT3x4;
1102    case SLANG_SPEC_MAT43:
1103       return GL_FLOAT_MAT4x3;
1104    case SLANG_SPEC_SAMPLER1D:
1105       return GL_SAMPLER_1D;
1106    case SLANG_SPEC_SAMPLER2D:
1107       return GL_SAMPLER_2D;
1108    case SLANG_SPEC_SAMPLER3D:
1109       return GL_SAMPLER_3D;
1110    case SLANG_SPEC_SAMPLERCUBE:
1111       return GL_SAMPLER_CUBE;
1112    case SLANG_SPEC_SAMPLER1DSHADOW:
1113       return GL_SAMPLER_1D_SHADOW;
1114    case SLANG_SPEC_SAMPLER2DSHADOW:
1115       return GL_SAMPLER_2D_SHADOW;
1116    case SLANG_SPEC_SAMPLER2DRECT:
1117       return GL_SAMPLER_2D_RECT_ARB;
1118    case SLANG_SPEC_SAMPLER2DRECTSHADOW:
1119       return GL_SAMPLER_2D_RECT_SHADOW_ARB;
1120    case SLANG_SPEC_ARRAY:
1121       return _slang_gltype_from_specifier(type->_array);
1122    case SLANG_SPEC_STRUCT:
1123       /* fall-through */
1124    default:
1125       return GL_NONE;
1126    }
1127 }
1128