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 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 GLvoid
 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 GLvoid
 170 slang_type_specifier_ctr(slang_type_specifier * self)
 171 {
 172    self->type = SLANG_SPEC_VOID;
 173    self->_struct = NULL;
 174    self->_array = NULL;
 175 }
 176
 177 GLvoid
 178 slang_type_specifier_dtr(slang_type_specifier * self)
 179 {
 180    if (self->_struct != NULL) {
 181       slang_struct_destruct(self->_struct);
 182       _slang_free(self->_struct);
 183    }
 184    if (self->_array != NULL) {
 185       slang_type_specifier_dtr(self->_array);
 186       _slang_free(self->_array);
 187    }
 188 }
 189
 190 GLboolean
 191 slang_type_specifier_copy(slang_type_specifier * x,
 192                           const slang_type_specifier * y)
 193 {
 194    slang_type_specifier z;
 195
 196    slang_type_specifier_ctr(&z);
 197    z.type = y->type;
 198    if (z.type == SLANG_SPEC_STRUCT) {
 199       z._struct = (slang_struct *) _slang_alloc(sizeof(slang_struct));
 200       if (z._struct == NULL) {
 201          slang_type_specifier_dtr(&z);
 202          return GL_FALSE;
 203       }
 204       if (!slang_struct_construct(z._struct)) {
 205          _slang_free(z._struct);
 206          slang_type_specifier_dtr(&z);
 207          return GL_FALSE;
 208       }
 209       if (!slang_struct_copy(z._struct, y->_struct)) {
 210          slang_type_specifier_dtr(&z);
 211          return GL_FALSE;
 212       }
 213    }
 214    else if (z.type == SLANG_SPEC_ARRAY) {
 215       z._array = (slang_type_specifier *)
 216          _slang_alloc(sizeof(slang_type_specifier));
 217       if (z._array == NULL) {
 218          slang_type_specifier_dtr(&z);
 219          return GL_FALSE;
 220       }
 221       slang_type_specifier_ctr(z._array);
 222       if (!slang_type_specifier_copy(z._array, y->_array)) {
 223          slang_type_specifier_dtr(&z);
 224          return GL_FALSE;
 225       }
 226    }
 227    slang_type_specifier_dtr(x);
 228    *x = z;
 229    return GL_TRUE;
 230 }
 231
 232
 233 /**
 234  * Test if two types are equal.
 235  */
 236 GLboolean
 237 slang_type_specifier_equal(const slang_type_specifier * x,
 238                            const slang_type_specifier * y)
 239 {
 240    if (x->type != y->type)
 241       return GL_FALSE;
 242    if (x->type == SLANG_SPEC_STRUCT)
 243       return slang_struct_equal(x->_struct, y->_struct);
 244    if (x->type == SLANG_SPEC_ARRAY)
 245       return slang_type_specifier_equal(x->_array, y->_array);
 246    return GL_TRUE;
 247 }
 248
 249
 250 /**
 251  * As above, but allow float/int casting.
 252  */
 253 static GLboolean
 254 slang_type_specifier_compatible(const slang_type_specifier * x,
 255                                 const slang_type_specifier * y)
 256 {
 257    /* special case: float == int */
 258    if (x->type == SLANG_SPEC_INT && y->type == SLANG_SPEC_FLOAT) {
 259       return GL_TRUE;
 260    }
 261    /* XXX may need to add bool/int compatibility, etc */
 262
 263    if (x->type != y->type)
 264       return GL_FALSE;
 265    if (x->type == SLANG_SPEC_STRUCT)
 266       return slang_struct_equal(x->_struct, y->_struct);
 267    if (x->type == SLANG_SPEC_ARRAY)
 268       return slang_type_specifier_compatible(x->_array, y->_array);
 269    return GL_TRUE;
 270 }
 271
 272
 273 GLboolean
 274 slang_typeinfo_construct(slang_typeinfo * ti)
 275 {
 276    slang_type_specifier_ctr(&ti->spec);
 277    ti->array_len = 0;
 278    return GL_TRUE;
 279 }
 280
 281 GLvoid
 282 slang_typeinfo_destruct(slang_typeinfo * ti)
 283 {
 284    slang_type_specifier_dtr(&ti->spec);
 285 }
 286
 287
 288
 289 /**
 290  * Determine the return type of a function.
 291  * \param a_name  the function name
 292  * \param param  function parameters (overloading)
 293  * \param num_params  number of parameters to function
 294  * \param space  namespace to search
 295  * \param spec  returns the type
 296  * \param funFound  returns pointer to the function, or NULL if not found.
 297  * \return GL_TRUE for success, GL_FALSE if failure (bad function name)
 298  */
 299 static GLboolean
 300 _slang_typeof_function(slang_atom a_name,
 301                        slang_operation * params, GLuint num_params,
 302                        const slang_name_space * space,
 303                        slang_type_specifier * spec,
 304                        slang_function **funFound,
 305                        slang_atom_pool *atoms, slang_info_log *log)
 306 {
 307    *funFound = _slang_locate_function(space->funcs, a_name, params,
 308                                       num_params, space, atoms, log);
 309    if (!*funFound)
 310       return GL_TRUE;  /* yes, not false */
 311    return slang_type_specifier_copy(spec, &(*funFound)->header.type.specifier);
 312 }
 313
 314
 315 /**
 316  * Determine the type of a math function.
 317  * \param name  name of the operator, one of +,-,*,/ or unary -
 318  * \param params  array of function parameters
 319  * \param num_params  number of parameters
 320  * \param space  namespace to use
 321  * \param spec  returns the function's type
 322  * \param atoms  atom pool
 323  * \return GL_TRUE for success, GL_FALSE if failure
 324  */
 325 static GLboolean
 326 typeof_math_call(const char *name, slang_operation *call,
 327                  const slang_name_space * space,
 328                  slang_type_specifier * spec,
 329                  slang_atom_pool * atoms,
 330                  slang_info_log *log)
 331 {
 332    if (call->fun) {
 333       /* we've previously resolved this function call */
 334       slang_type_specifier_copy(spec, &call->fun->header.type.specifier);
 335       return GL_TRUE;
 336    }
 337    else {
 338       slang_atom atom;
 339       slang_function *fun;
 340
 341       /* number of params: */
 342       assert(call->num_children == 1 || call->num_children == 2);
 343
 344       atom = slang_atom_pool_atom(atoms, name);
 345       if (!_slang_typeof_function(atom, call->children, call->num_children,
 346                                   space, spec, &fun, atoms, log))
 347          return GL_FALSE;
 348
 349       if (fun) {
 350          /* Save pointer to save time in future */
 351          call->fun = fun;
 352          return GL_TRUE;
 353       }
 354       return GL_FALSE;
 355    }
 356 }
 357
 358 GLboolean
 359 _slang_typeof_operation(const slang_assemble_ctx * A,
 360                         slang_operation * op,
 361                         slang_typeinfo * ti)
 362 {
 363    return _slang_typeof_operation_(op, &A->space, ti, A->atoms, A->log);
 364 }
 365
 366
 367 /**
 368  * Determine the return type of an operation.
 369  * \param op  the operation node
 370  * \param space  the namespace to use
 371  * \param ti  the returned type
 372  * \param atoms  atom pool
 373  * \return GL_TRUE for success, GL_FALSE if failure
 374  */
 375 GLboolean
 376 _slang_typeof_operation_(slang_operation * op,
 377                          const slang_name_space * space,
 378                          slang_typeinfo * ti,
 379                          slang_atom_pool * atoms,
 380                          slang_info_log *log)
 381 {
 382    ti->can_be_referenced = GL_FALSE;
 383    ti->is_swizzled = GL_FALSE;
 384
 385    switch (op->type) {
 386    case SLANG_OPER_BLOCK_NO_NEW_SCOPE:
 387    case SLANG_OPER_BLOCK_NEW_SCOPE:
 388    case SLANG_OPER_VARIABLE_DECL:
 389    case SLANG_OPER_ASM:
 390    case SLANG_OPER_BREAK:
 391    case SLANG_OPER_CONTINUE:
 392    case SLANG_OPER_DISCARD:
 393    case SLANG_OPER_RETURN:
 394    case SLANG_OPER_IF:
 395    case SLANG_OPER_WHILE:
 396    case SLANG_OPER_DO:
 397    case SLANG_OPER_FOR:
 398    case SLANG_OPER_VOID:
 399       ti->spec.type = SLANG_SPEC_VOID;
 400       break;
 401    case SLANG_OPER_EXPRESSION:
 402    case SLANG_OPER_ASSIGN:
 403    case SLANG_OPER_ADDASSIGN:
 404    case SLANG_OPER_SUBASSIGN:
 405    case SLANG_OPER_MULASSIGN:
 406    case SLANG_OPER_DIVASSIGN:
 407    case SLANG_OPER_PREINCREMENT:
 408    case SLANG_OPER_PREDECREMENT:
 409       if (!_slang_typeof_operation_(op->children, space, ti, atoms, log))
 410          return GL_FALSE;
 411       break;
 412    case SLANG_OPER_LITERAL_BOOL:
 413       if (op->literal_size == 1)
 414          ti->spec.type = SLANG_SPEC_BOOL;
 415       else if (op->literal_size == 2)
 416          ti->spec.type = SLANG_SPEC_BVEC2;
 417       else if (op->literal_size == 3)
 418          ti->spec.type = SLANG_SPEC_BVEC3;
 419       else if (op->literal_size == 4)
 420          ti->spec.type = SLANG_SPEC_BVEC4;
 421       else {
 422          _mesa_problem(NULL,
 423                "Unexpected bool literal_size %d in _slang_typeof_operation()",
 424                op->literal_size);
 425          ti->spec.type = SLANG_SPEC_BOOL;
 426       }
 427       break;
 428    case SLANG_OPER_LOGICALOR:
 429    case SLANG_OPER_LOGICALXOR:
 430    case SLANG_OPER_LOGICALAND:
 431    case SLANG_OPER_EQUAL:
 432    case SLANG_OPER_NOTEQUAL:
 433    case SLANG_OPER_LESS:
 434    case SLANG_OPER_GREATER:
 435    case SLANG_OPER_LESSEQUAL:
 436    case SLANG_OPER_GREATEREQUAL:
 437    case SLANG_OPER_NOT:
 438       ti->spec.type = SLANG_SPEC_BOOL;
 439       break;
 440    case SLANG_OPER_LITERAL_INT:
 441       if (op->literal_size == 1)
 442          ti->spec.type = SLANG_SPEC_INT;
 443       else if (op->literal_size == 2)
 444          ti->spec.type = SLANG_SPEC_IVEC2;
 445       else if (op->literal_size == 3)
 446          ti->spec.type = SLANG_SPEC_IVEC3;
 447       else if (op->literal_size == 4)
 448          ti->spec.type = SLANG_SPEC_IVEC4;
 449       else {
 450          _mesa_problem(NULL,
 451                "Unexpected int literal_size %d in _slang_typeof_operation()",
 452                op->literal_size);
 453          ti->spec.type = SLANG_SPEC_INT;
 454       }
 455       break;
 456    case SLANG_OPER_LITERAL_FLOAT:
 457       if (op->literal_size == 1)
 458          ti->spec.type = SLANG_SPEC_FLOAT;
 459       else if (op->literal_size == 2)
 460          ti->spec.type = SLANG_SPEC_VEC2;
 461       else if (op->literal_size == 3)
 462          ti->spec.type = SLANG_SPEC_VEC3;
 463       else if (op->literal_size == 4)
 464          ti->spec.type = SLANG_SPEC_VEC4;
 465       else {
 466          _mesa_problem(NULL,
 467                "Unexpected float literal_size %d in _slang_typeof_operation()",
 468                op->literal_size);
 469          ti->spec.type = SLANG_SPEC_FLOAT;
 470       }
 471       break;
 472    case SLANG_OPER_IDENTIFIER:
 473       {
 474          slang_variable *var;
 475          var = _slang_locate_variable(op->locals, op->a_id, GL_TRUE);
 476          if (!var) {
 477             slang_info_log_error(log, "undefined variable '%s'",
 478                                  (char *) op->a_id);
 479             return GL_FALSE;
 480          }
 481          if (!slang_type_specifier_copy(&ti->spec, &var->type.specifier)) {
 482             slang_info_log_memory(log);
 483             return GL_FALSE;
 484          }
 485          ti->can_be_referenced = GL_TRUE;
 486          ti->array_len = var->array_len;
 487       }
 488       break;
 489    case SLANG_OPER_SEQUENCE:
 490       /* TODO: check [0] and [1] if they match */
 491       if (!_slang_typeof_operation_(&op->children[1], space, ti, atoms, log)) {
 492          return GL_FALSE;
 493       }
 494       ti->can_be_referenced = GL_FALSE;
 495       ti->is_swizzled = GL_FALSE;
 496       break;
 497       /*case SLANG_OPER_MODASSIGN: */
 498       /*case SLANG_OPER_LSHASSIGN: */
 499       /*case SLANG_OPER_RSHASSIGN: */
 500       /*case SLANG_OPER_ORASSIGN: */
 501       /*case SLANG_OPER_XORASSIGN: */
 502       /*case SLANG_OPER_ANDASSIGN: */
 503    case SLANG_OPER_SELECT:
 504       /* TODO: check [1] and [2] if they match */
 505       if (!_slang_typeof_operation_(&op->children[1], space, ti, atoms, log)) {
 506          return GL_FALSE;
 507       }
 508       ti->can_be_referenced = GL_FALSE;
 509       ti->is_swizzled = GL_FALSE;
 510       break;
 511       /*case SLANG_OPER_BITOR: */
 512       /*case SLANG_OPER_BITXOR: */
 513       /*case SLANG_OPER_BITAND: */
 514       /*case SLANG_OPER_LSHIFT: */
 515       /*case SLANG_OPER_RSHIFT: */
 516    case SLANG_OPER_ADD:
 517       assert(op->num_children == 2);
 518       if (!typeof_math_call("+", op, space, &ti->spec, atoms, log))
 519          return GL_FALSE;
 520       break;
 521    case SLANG_OPER_SUBTRACT:
 522       assert(op->num_children == 2);
 523       if (!typeof_math_call("-", op, space, &ti->spec, atoms, log))
 524          return GL_FALSE;
 525       break;
 526    case SLANG_OPER_MULTIPLY:
 527       assert(op->num_children == 2);
 528       if (!typeof_math_call("*", op, space, &ti->spec, atoms, log))
 529          return GL_FALSE;
 530       break;
 531    case SLANG_OPER_DIVIDE:
 532       assert(op->num_children == 2);
 533       if (!typeof_math_call("/", op, space, &ti->spec, atoms, log))
 534          return GL_FALSE;
 535       break;
 536    /*case SLANG_OPER_MODULUS: */
 537    case SLANG_OPER_PLUS:
 538       if (!_slang_typeof_operation_(op->children, space, ti, atoms, log))
 539          return GL_FALSE;
 540       ti->can_be_referenced = GL_FALSE;
 541       ti->is_swizzled = GL_FALSE;
 542       break;
 543    case SLANG_OPER_MINUS:
 544       assert(op->num_children == 1);
 545       if (!typeof_math_call("-", op, space, &ti->spec, atoms, log))
 546          return GL_FALSE;
 547       break;
 548       /*case SLANG_OPER_COMPLEMENT: */
 549    case SLANG_OPER_SUBSCRIPT:
 550       {
 551          slang_typeinfo _ti;
 552
 553          if (!slang_typeinfo_construct(&_ti))
 554             return GL_FALSE;
 555          if (!_slang_typeof_operation_(op->children, space, &_ti, atoms, log)) {
 556             slang_typeinfo_destruct(&_ti);
 557             return GL_FALSE;
 558          }
 559          ti->can_be_referenced = _ti.can_be_referenced;
 560          if (_ti.spec.type == SLANG_SPEC_ARRAY) {
 561             if (!slang_type_specifier_copy(&ti->spec, _ti.spec._array)) {
 562                slang_typeinfo_destruct(&_ti);
 563                return GL_FALSE;
 564             }
 565          }
 566          else {
 567             if (!_slang_type_is_vector(_ti.spec.type)
 568                 && !_slang_type_is_matrix(_ti.spec.type)) {
 569                slang_typeinfo_destruct(&_ti);
 570                slang_info_log_error(log, "cannot index a non-array type");
 571                return GL_FALSE;
 572             }
 573             ti->spec.type = _slang_type_base(_ti.spec.type);
 574          }
 575          slang_typeinfo_destruct(&_ti);
 576       }
 577       break;
 578    case SLANG_OPER_CALL:
 579       if (op->fun) {
 580          /* we've resolved this call before */
 581          slang_type_specifier_copy(&ti->spec, &op->fun->header.type.specifier);
 582       }
 583       else {
 584          slang_function *fun;
 585          if (!_slang_typeof_function(op->a_id, op->children, op->num_children,
 586                                      space, &ti->spec, &fun, atoms, log))
 587             return GL_FALSE;
 588          if (fun) {
 589             /* save result for future use */
 590             op->fun = fun;
 591          }
 592          else {
 593             slang_struct *s =
 594                slang_struct_scope_find(space->structs, op->a_id, GL_TRUE);
 595             if (s) {
 596                /* struct initializer */
 597                ti->spec.type = SLANG_SPEC_STRUCT;
 598                ti->spec._struct =
 599                   (slang_struct *) _slang_alloc(sizeof(slang_struct));
 600                if (ti->spec._struct == NULL)
 601                   return GL_FALSE;
 602                if (!slang_struct_construct(ti->spec._struct)) {
 603                   _slang_free(ti->spec._struct);
 604                   ti->spec._struct = NULL;
 605                   return GL_FALSE;
 606                }
 607                if (!slang_struct_copy(ti->spec._struct, s))
 608                   return GL_FALSE;
 609             }
 610             else {
 611                /* float, int, vec4, mat3, etc. constructor? */
 612                const char *name;
 613                slang_type_specifier_type type;
 614
 615                name = slang_atom_pool_id(atoms, op->a_id);
 616                type = slang_type_specifier_type_from_string(name);
 617                if (type == SLANG_SPEC_VOID) {
 618                   slang_info_log_error(log, "undefined function '%s'", name);
 619                   return GL_FALSE;
 620                }
 621                ti->spec.type = type;
 622             }
 623          }
 624       }
 625       break;
 626    case SLANG_OPER_FIELD:
 627       {
 628          slang_typeinfo _ti;
 629
 630          if (!slang_typeinfo_construct(&_ti))
 631             return GL_FALSE;
 632          if (!_slang_typeof_operation_(op->children, space, &_ti, atoms, log)) {
 633             slang_typeinfo_destruct(&_ti);
 634             return GL_FALSE;
 635          }
 636          if (_ti.spec.type == SLANG_SPEC_STRUCT) {
 637             slang_variable *field;
 638
 639             field = _slang_locate_variable(_ti.spec._struct->fields, op->a_id,
 640                                            GL_FALSE);
 641             if (field == NULL) {
 642                slang_typeinfo_destruct(&_ti);
 643                return GL_FALSE;
 644             }
 645             if (!slang_type_specifier_copy(&ti->spec, &field->type.specifier)) {
 646                slang_typeinfo_destruct(&_ti);
 647                return GL_FALSE;
 648             }
 649             ti->can_be_referenced = _ti.can_be_referenced;
 650          }
 651          else {
 652             GLuint rows;
 653             const char *swizzle;
 654             slang_type_specifier_type base;
 655
 656             /* determine the swizzle of the field expression */
 657             if (!_slang_type_is_vector(_ti.spec.type)) {
 658                slang_typeinfo_destruct(&_ti);
 659                slang_info_log_error(log, "Can't swizzle scalar expression");
 660                return GL_FALSE;
 661             }
 662             rows = _slang_type_dim(_ti.spec.type);
 663             swizzle = slang_atom_pool_id(atoms, op->a_id);
 664             if (!_slang_is_swizzle(swizzle, rows, &ti->swz)) {
 665                slang_typeinfo_destruct(&_ti);
 666                slang_info_log_error(log, "bad swizzle '%s'", swizzle);
 667                return GL_FALSE;
 668             }
 669             ti->is_swizzled = GL_TRUE;
 670             ti->can_be_referenced = _ti.can_be_referenced
 671                && _slang_is_swizzle_mask(&ti->swz, rows);
 672             if (_ti.is_swizzled) {
 673                slang_swizzle swz;
 674
 675                /* swizzle the swizzle */
 676                _slang_multiply_swizzles(&swz, &_ti.swz, &ti->swz);
 677                ti->swz = swz;
 678             }
 679             base = _slang_type_base(_ti.spec.type);
 680             switch (ti->swz.num_components) {
 681             case 1:
 682                ti->spec.type = base;
 683                break;
 684             case 2:
 685                switch (base) {
 686                case SLANG_SPEC_FLOAT:
 687                   ti->spec.type = SLANG_SPEC_VEC2;
 688                   break;
 689                case SLANG_SPEC_INT:
 690                   ti->spec.type = SLANG_SPEC_IVEC2;
 691                   break;
 692                case SLANG_SPEC_BOOL:
 693                   ti->spec.type = SLANG_SPEC_BVEC2;
 694                   break;
 695                default:
 696                   break;
 697                }
 698                break;
 699             case 3:
 700                switch (base) {
 701                case SLANG_SPEC_FLOAT:
 702                   ti->spec.type = SLANG_SPEC_VEC3;
 703                   break;
 704                case SLANG_SPEC_INT:
 705                   ti->spec.type = SLANG_SPEC_IVEC3;
 706                   break;
 707                case SLANG_SPEC_BOOL:
 708                   ti->spec.type = SLANG_SPEC_BVEC3;
 709                   break;
 710                default:
 711                   break;
 712                }
 713                break;
 714             case 4:
 715                switch (base) {
 716                case SLANG_SPEC_FLOAT:
 717                   ti->spec.type = SLANG_SPEC_VEC4;
 718                   break;
 719                case SLANG_SPEC_INT:
 720                   ti->spec.type = SLANG_SPEC_IVEC4;
 721                   break;
 722                case SLANG_SPEC_BOOL:
 723                   ti->spec.type = SLANG_SPEC_BVEC4;
 724                   break;
 725                default:
 726                   break;
 727                }
 728                break;
 729             default:
 730                break;
 731             }
 732          }
 733          slang_typeinfo_destruct(&_ti);
 734       }
 735       break;
 736    case SLANG_OPER_POSTINCREMENT:
 737    case SLANG_OPER_POSTDECREMENT:
 738       if (!_slang_typeof_operation_(op->children, space, ti, atoms, log))
 739          return GL_FALSE;
 740       ti->can_be_referenced = GL_FALSE;
 741       ti->is_swizzled = GL_FALSE;
 742       break;
 743    default:
 744       return GL_FALSE;
 745    }
 746
 747    return GL_TRUE;
 748 }
 749
 750
 751 /**
 752  * Lookup a function according to name and parameter count/types.
 753  */
 754 slang_function *
 755 _slang_locate_function(const slang_function_scope * funcs, slang_atom a_name,
 756                        slang_operation * args, GLuint num_args,
 757                        const slang_name_space * space, slang_atom_pool * atoms,
 758                        slang_info_log *log)
 759 {
 760    GLuint i;
 761
 762    for (i = 0; i < funcs->num_functions; i++) {
 763       slang_function *f = &funcs->functions[i];
 764       const GLuint haveRetValue = _slang_function_has_return_value(f);
 765       GLuint j;
 766
 767       if (a_name != f->header.a_name)
 768          continue;
 769       if (f->param_count - haveRetValue != num_args)
 770          continue;
 771
 772       /* compare parameter / argument types */
 773       for (j = 0; j < num_args; j++) {
 774          slang_typeinfo ti;
 775
 776          if (!slang_typeinfo_construct(&ti))
 777             return NULL;
 778          if (!_slang_typeof_operation_(&args[j], space, &ti, atoms, log)) {
 779             slang_typeinfo_destruct(&ti);
 780             return NULL;
 781          }
 782          if (!slang_type_specifier_compatible(&ti.spec,
 783              &f->parameters->variables[j]->type.specifier)) {
 784             slang_typeinfo_destruct(&ti);
 785             break;
 786          }
 787          slang_typeinfo_destruct(&ti);
 788
 789          /* "out" and "inout" formal parameter requires the actual
 790           * parameter to be l-value.
 791           */
 792          if (!ti.can_be_referenced &&
 793              (f->parameters->variables[j]->type.qualifier == SLANG_QUAL_OUT ||
 794               f->parameters->variables[j]->type.qualifier == SLANG_QUAL_INOUT))
 795             break;
 796       }
 797       if (j == num_args)
 798          return f;
 799    }
 800    if (funcs->outer_scope != NULL)
 801       return _slang_locate_function(funcs->outer_scope, a_name, args,
 802                                     num_args, space, atoms, log);
 803    return NULL;
 804 }
 805
 806
 807 /**
 808  * Determine if a type is a matrix.
 809  * \return GL_TRUE if is a matrix, GL_FALSE otherwise.
 810  */
 811 GLboolean
 812 _slang_type_is_matrix(slang_type_specifier_type ty)
 813 {
 814    switch (ty) {
 815    case SLANG_SPEC_MAT2:
 816    case SLANG_SPEC_MAT3:
 817    case SLANG_SPEC_MAT4:
 818    case SLANG_SPEC_MAT23:
 819    case SLANG_SPEC_MAT32:
 820    case SLANG_SPEC_MAT24:
 821    case SLANG_SPEC_MAT42:
 822    case SLANG_SPEC_MAT34:
 823    case SLANG_SPEC_MAT43:
 824       return GL_TRUE;
 825    default:
 826       return GL_FALSE;
 827    }
 828 }
 829
 830
 831 /**
 832  * Determine if a type is a vector.
 833  * \return GL_TRUE if is a vector, GL_FALSE otherwise.
 834  */
 835 GLboolean
 836 _slang_type_is_vector(slang_type_specifier_type ty)
 837 {
 838    switch (ty) {
 839    case SLANG_SPEC_VEC2:
 840    case SLANG_SPEC_VEC3:
 841    case SLANG_SPEC_VEC4:
 842    case SLANG_SPEC_IVEC2:
 843    case SLANG_SPEC_IVEC3:
 844    case SLANG_SPEC_IVEC4:
 845    case SLANG_SPEC_BVEC2:
 846    case SLANG_SPEC_BVEC3:
 847    case SLANG_SPEC_BVEC4:
 848       return GL_TRUE;
 849    default:
 850       return GL_FALSE;
 851    }
 852 }
 853
 854
 855 /**
 856  * Given a vector type, return the type of the vector's elements.
 857  * For a matrix, return the type of the columns.
 858  */
 859 slang_type_specifier_type
 860 _slang_type_base(slang_type_specifier_type ty)
 861 {
 862    switch (ty) {
 863    case SLANG_SPEC_FLOAT:
 864    case SLANG_SPEC_VEC2:
 865    case SLANG_SPEC_VEC3:
 866    case SLANG_SPEC_VEC4:
 867       return SLANG_SPEC_FLOAT;
 868    case SLANG_SPEC_INT:
 869    case SLANG_SPEC_IVEC2:
 870    case SLANG_SPEC_IVEC3:
 871    case SLANG_SPEC_IVEC4:
 872       return SLANG_SPEC_INT;
 873    case SLANG_SPEC_BOOL:
 874    case SLANG_SPEC_BVEC2:
 875    case SLANG_SPEC_BVEC3:
 876    case SLANG_SPEC_BVEC4:
 877       return SLANG_SPEC_BOOL;
 878    case SLANG_SPEC_MAT2:
 879       return SLANG_SPEC_VEC2;
 880    case SLANG_SPEC_MAT3:
 881       return SLANG_SPEC_VEC3;
 882    case SLANG_SPEC_MAT4:
 883       return SLANG_SPEC_VEC4;
 884    case SLANG_SPEC_MAT23:
 885       return SLANG_SPEC_VEC3;
 886    case SLANG_SPEC_MAT32:
 887       return SLANG_SPEC_VEC2;
 888    case SLANG_SPEC_MAT24:
 889       return SLANG_SPEC_VEC4;
 890    case SLANG_SPEC_MAT42:
 891       return SLANG_SPEC_VEC2;
 892    case SLANG_SPEC_MAT34:
 893       return SLANG_SPEC_VEC4;
 894    case SLANG_SPEC_MAT43:
 895       return SLANG_SPEC_VEC3;
 896    default:
 897       return SLANG_SPEC_VOID;
 898    }
 899 }
 900
 901
 902 /**
 903  * Return the dimensionality of a vector, or for a matrix, return number
 904  * of columns.
 905  */
 906 GLuint
 907 _slang_type_dim(slang_type_specifier_type ty)
 908 {
 909    switch (ty) {
 910    case SLANG_SPEC_FLOAT:
 911    case SLANG_SPEC_INT:
 912    case SLANG_SPEC_BOOL:
 913       return 1;
 914    case SLANG_SPEC_VEC2:
 915    case SLANG_SPEC_IVEC2:
 916    case SLANG_SPEC_BVEC2:
 917    case SLANG_SPEC_MAT2:
 918       return 2;
 919    case SLANG_SPEC_VEC3:
 920    case SLANG_SPEC_IVEC3:
 921    case SLANG_SPEC_BVEC3:
 922    case SLANG_SPEC_MAT3:
 923       return 3;
 924    case SLANG_SPEC_VEC4:
 925    case SLANG_SPEC_IVEC4:
 926    case SLANG_SPEC_BVEC4:
 927    case SLANG_SPEC_MAT4:
 928       return 4;
 929
 930    case SLANG_SPEC_MAT23:
 931       return 2;
 932    case SLANG_SPEC_MAT32:
 933       return 3;
 934    case SLANG_SPEC_MAT24:
 935       return 2;
 936    case SLANG_SPEC_MAT42:
 937       return 4;
 938    case SLANG_SPEC_MAT34:
 939       return 3;
 940    case SLANG_SPEC_MAT43:
 941       return 4;
 942
 943    default:
 944       return 0;
 945    }
 946 }
 947
 948
 949 /**
 950  * Return the GL_* type that corresponds to a SLANG_SPEC_* type.
 951  */
 952 GLenum
 953 _slang_gltype_from_specifier(const slang_type_specifier *type)
 954 {
 955    switch (type->type) {
 956    case SLANG_SPEC_BOOL:
 957       return GL_BOOL;
 958    case SLANG_SPEC_BVEC2:
 959       return GL_BOOL_VEC2;
 960    case SLANG_SPEC_BVEC3:
 961       return GL_BOOL_VEC3;
 962    case SLANG_SPEC_BVEC4:
 963       return GL_BOOL_VEC4;
 964    case SLANG_SPEC_INT:
 965       return GL_INT;
 966    case SLANG_SPEC_IVEC2:
 967       return GL_INT_VEC2;
 968    case SLANG_SPEC_IVEC3:
 969       return GL_INT_VEC3;
 970    case SLANG_SPEC_IVEC4:
 971       return GL_INT_VEC4;
 972    case SLANG_SPEC_FLOAT:
 973       return GL_FLOAT;
 974    case SLANG_SPEC_VEC2:
 975       return GL_FLOAT_VEC2;
 976    case SLANG_SPEC_VEC3:
 977       return GL_FLOAT_VEC3;
 978    case SLANG_SPEC_VEC4:
 979       return GL_FLOAT_VEC4;
 980    case SLANG_SPEC_MAT2:
 981       return GL_FLOAT_MAT2;
 982    case SLANG_SPEC_MAT3:
 983       return GL_FLOAT_MAT3;
 984    case SLANG_SPEC_MAT4:
 985       return GL_FLOAT_MAT4;
 986    case SLANG_SPEC_MAT23:
 987       return GL_FLOAT_MAT2x3;
 988    case SLANG_SPEC_MAT32:
 989       return GL_FLOAT_MAT3x2;
 990    case SLANG_SPEC_MAT24:
 991       return GL_FLOAT_MAT2x4;
 992    case SLANG_SPEC_MAT42:
 993       return GL_FLOAT_MAT4x2;
 994    case SLANG_SPEC_MAT34:
 995       return GL_FLOAT_MAT3x4;
 996    case SLANG_SPEC_MAT43:
 997       return GL_FLOAT_MAT4x3;
 998    case SLANG_SPEC_SAMPLER1D:
 999       return GL_SAMPLER_1D;
1000    case SLANG_SPEC_SAMPLER2D:
1001       return GL_SAMPLER_2D;
1002    case SLANG_SPEC_SAMPLER3D:
1003       return GL_SAMPLER_3D;
1004    case SLANG_SPEC_SAMPLERCUBE:
1005       return GL_SAMPLER_CUBE;
1006    case SLANG_SPEC_SAMPLER1DSHADOW:
1007       return GL_SAMPLER_1D_SHADOW;
1008    case SLANG_SPEC_SAMPLER2DSHADOW:
1009       return GL_SAMPLER_2D_SHADOW;
1010    case SLANG_SPEC_SAMPLER2DRECT:
1011       return GL_SAMPLER_2D_RECT_ARB;
1012    case SLANG_SPEC_SAMPLER2DRECTSHADOW:
1013       return GL_SAMPLER_2D_RECT_SHADOW_ARB;
1014    case SLANG_SPEC_ARRAY:
1015       return _slang_gltype_from_specifier(type->_array);
1016    case SLANG_SPEC_STRUCT:
1017       /* fall-through */
1018    default:
1019       return GL_NONE;
1020    }
1021 }
1022