source/glsl/generate.cpp

   1 #include <msp/core/hash.h>
   2 #include <msp/core/raii.h>
   3 #include <msp/strings/lexicalcast.h>
   4 #include "builtin.h"
   5 #include "generate.h"
   6
   7 using namespace std;
   8
   9 namespace Msp {
  10 namespace GL {
  11 namespace SL {
  12
  13 void DeclarationCombiner::apply(Stage &stage)
  14 {
  15         stage.content.visit(*this);
  16         NodeRemover().apply(stage, nodes_to_remove);
  17 }
  18
  19 void DeclarationCombiner::visit(Block &block)
  20 {
  21         if(current_block)
  22                 return;
  23
  24         TraversingVisitor::visit(block);
  25 }
  26
  27 void DeclarationCombiner::visit(VariableDeclaration &var)
  28 {
  29         VariableDeclaration *&ptr = variables[var.name];
  30         if(ptr)
  31         {
  32                 ptr->type = var.type;
  33                 if(var.init_expression)
  34                         ptr->init_expression = var.init_expression;
  35                 if(var.layout)
  36                 {
  37                         if(ptr->layout)
  38                         {
  39                                 for(vector<Layout::Qualifier>::iterator i=var.layout->qualifiers.begin(); i!=var.layout->qualifiers.end(); ++i)
  40                                 {
  41                                         bool found = false;
  42                                         for(vector<Layout::Qualifier>::iterator j=ptr->layout->qualifiers.begin(); (!found && j!=ptr->layout->qualifiers.end()); ++j)
  43                                                 if(j->name==i->name)
  44                                                 {
  45                                                         j->has_value = i->value;
  46                                                         j->value = i->value;
  47                                                         found = true;
  48                                                 }
  49
  50                                         if(!found)
  51                                                 ptr->layout->qualifiers.push_back(*i);
  52                                 }
  53                         }
  54                         else
  55                                 ptr->layout = var.layout;
  56                 }
  57                 nodes_to_remove.insert(&var);
  58         }
  59         else
  60                 ptr = &var;
  61 }
  62
  63
  64 ConstantSpecializer::ConstantSpecializer():
  65         values(0)
  66 { }
  67
  68 void ConstantSpecializer::apply(Stage &stage, const map<string, int> *v)
  69 {
  70         values = v;
  71         stage.content.visit(*this);
  72 }
  73
  74 void ConstantSpecializer::visit(VariableDeclaration &var)
  75 {
  76         bool specializable = false;
  77         if(var.layout)
  78         {
  79                 vector<Layout::Qualifier> &qualifiers = var.layout->qualifiers;
  80                 for(vector<Layout::Qualifier>::iterator i=qualifiers.begin(); i!=qualifiers.end(); ++i)
  81                         if(i->name=="constant_id")
  82                         {
  83                                 specializable = true;
  84                                 if(values)
  85                                         qualifiers.erase(i);
  86                                 else if(i->value==-1)
  87                                         i->value = hash32(var.name)&0x7FFFFFFF;
  88                                 break;
  89                         }
  90
  91                 if(qualifiers.empty())
  92                         var.layout = 0;
  93         }
  94
  95         if(specializable && values)
  96         {
  97                 map<string, int>::const_iterator i = values->find(var.name);
  98                 if(i!=values->end())
  99                 {
 100                         RefPtr<Literal> literal = new Literal;
 101                         if(var.type=="bool")
 102                                 literal->token = (i->second ? "true" : "false");
 103                         else if(var.type=="int")
 104                                 literal->token = lexical_cast<string>(i->second);
 105                         var.init_expression = literal;
 106                 }
 107         }
 108 }
 109
 110
 111 void BlockHierarchyResolver::enter(Block &block)
 112 {
 113         block.parent = current_block;
 114 }
 115
 116
 117 TypeResolver::TypeResolver():
 118         stage(0)
 119 { }
 120
 121 void TypeResolver::apply(Stage &s)
 122 {
 123         stage = &s;
 124         s.types.clear();
 125         s.content.visit(*this);
 126 }
 127
 128 void TypeResolver::visit(BasicTypeDeclaration &type)
 129 {
 130         map<string, TypeDeclaration *>::iterator i = stage->types.find(type.base);
 131         type.base_type = (i!=stage->types.end() ? i->second : 0);
 132
 133         if(type.kind==BasicTypeDeclaration::VECTOR && type.base_type)
 134                 if(BasicTypeDeclaration *basic_base = dynamic_cast<BasicTypeDeclaration *>(type.base_type))
 135                         if(basic_base->kind==BasicTypeDeclaration::VECTOR)
 136                         {
 137                                 type.kind = BasicTypeDeclaration::MATRIX;
 138                                 type.size |= basic_base->size<<16;
 139                         }
 140
 141         stage->types.insert(make_pair(type.name, &type));
 142 }
 143
 144 void TypeResolver::visit(ImageTypeDeclaration &type)
 145 {
 146         map<string, TypeDeclaration *>::iterator i = stage->types.find(type.base);
 147         type.base_type = (i!=stage->types.end() ? i->second : 0);
 148
 149         stage->types.insert(make_pair(type.name, &type));
 150 }
 151
 152 void TypeResolver::visit(StructDeclaration &strct)
 153 {
 154         stage->types.insert(make_pair(strct.name, &strct));
 155         TraversingVisitor::visit(strct);
 156 }
 157
 158 void TypeResolver::visit(VariableDeclaration &var)
 159 {
 160         map<string, TypeDeclaration *>::iterator i = stage->types.find(var.type);
 161         if(i!=stage->types.end())
 162                 var.type_declaration = i->second;
 163 }
 164
 165
 166 VariableResolver::VariableResolver():
 167         stage(0),
 168         r_members(0),
 169         record_target(false),
 170         r_self_referencing(false),
 171         r_assignment_target(0)
 172 { }
 173
 174 void VariableResolver::apply(Stage &s)
 175 {
 176         stage = &s;
 177         s.interface_blocks.clear();
 178         s.content.visit(*this);
 179 }
 180
 181 void VariableResolver::enter(Block &block)
 182 {
 183         block.variables.clear();
 184 }
 185
 186 void VariableResolver::visit(VariableReference &var)
 187 {
 188         var.declaration = 0;
 189         r_members = 0;
 190         /* Look for variable declarations in the block hierarchy first.  Interface
 191         blocks are always defined in the top level so we can't accidentally skip
 192         one. */
 193         for(Block *block=current_block; (!var.declaration && block); block=block->parent)
 194         {
 195                 map<string, VariableDeclaration *>::iterator i = block->variables.find(var.name);
 196                 if(i!=block->variables.end())
 197                         var.declaration = i->second;
 198         }
 199
 200         if(!var.declaration)
 201         {
 202                 const map<string, InterfaceBlock *> &blocks = stage->interface_blocks;
 203                 map<string, InterfaceBlock *>::const_iterator i = blocks.find("_"+var.name);
 204                 if(i!=blocks.end())
 205                 {
 206                         /* The name refers to an interface block with an instance name rather
 207                         than a variable.  Prepare a new syntax tree node accordingly. */
 208                         r_iface_ref = new InterfaceBlockReference;
 209                         r_iface_ref->source = var.source;
 210                         r_iface_ref->line = var.line;
 211                         r_iface_ref->name = var.name;
 212                         r_iface_ref->declaration = i->second;
 213                         r_members = &i->second->members.variables;
 214                 }
 215                 else
 216                 {
 217                         // Look for the variable in anonymous interface blocks.
 218                         for(i=blocks.begin(); (!var.declaration && i!=blocks.end()); ++i)
 219                                 if(i->second->instance_name.empty())
 220                                 {
 221                                         map<string, VariableDeclaration *>::iterator j = i->second->members.variables.find(var.name);
 222                                         if(j!=i->second->members.variables.end())
 223                                                 var.declaration = j->second;
 224                                 }
 225                 }
 226         }
 227
 228         if(var.declaration)
 229                 if(StructDeclaration *strct = dynamic_cast<StructDeclaration *>(var.declaration->type_declaration))
 230                         r_members = &strct->members.variables;
 231
 232         if(record_target)
 233         {
 234                 if(r_assignment_target)
 235                 {
 236                         /* More than one variable reference found in assignment target.
 237                         Unable to determine what the primary target is. */
 238                         record_target = false;
 239                         r_assignment_target = 0;
 240                 }
 241                 else
 242                         r_assignment_target = var.declaration;
 243         }
 244         else if(var.declaration && var.declaration==r_assignment_target)
 245                 r_self_referencing = true;
 246 }
 247
 248 void VariableResolver::visit(InterfaceBlockReference &iface)
 249 {
 250         iface.declaration = 0;
 251         for(Block *block=current_block; block; block=block->parent)
 252         {
 253                 map<string, InterfaceBlock *>::iterator i = stage->interface_blocks.find("_"+iface.name);
 254                 if(i!=stage->interface_blocks.end())
 255                 {
 256                         iface.declaration = i->second;
 257                         r_members = &i->second->members.variables;
 258                         break;
 259                 }
 260         }
 261 }
 262
 263 void VariableResolver::visit(MemberAccess &memacc)
 264 {
 265         r_members = 0;
 266         r_iface_ref = 0;
 267         memacc.left->visit(*this);
 268
 269         if(r_iface_ref)
 270                 memacc.left = r_iface_ref;
 271         r_iface_ref = 0;
 272
 273         memacc.declaration = 0;
 274         if(r_members)
 275         {
 276                 map<string, VariableDeclaration *>::iterator i = r_members->find(memacc.member);
 277                 if(i!=r_members->end())
 278                 {
 279                         memacc.declaration = i->second;
 280                         if(StructDeclaration *strct = dynamic_cast<StructDeclaration *>(i->second->type_declaration))
 281                                 r_members = &strct->members.variables;
 282                 }
 283                 else
 284                         r_members = 0;
 285         }
 286 }
 287
 288 void VariableResolver::visit(UnaryExpression &unary)
 289 {
 290         TraversingVisitor::visit(unary);
 291         r_members = 0;
 292         r_iface_ref = 0;
 293 }
 294
 295 void VariableResolver::visit(BinaryExpression &binary)
 296 {
 297         if(binary.oper->token[0]=='[')
 298         {
 299                 {
 300                         /* The subscript expression is not a part of the primary assignment
 301                         target. */
 302                         SetFlag set(record_target, false);
 303                         binary.right->visit(*this);
 304                 }
 305                 r_members = 0;
 306                 r_iface_ref = 0;
 307                 binary.left->visit(*this);
 308                 if(r_iface_ref)
 309                         binary.left = r_iface_ref;
 310         }
 311         else
 312         {
 313                 TraversingVisitor::visit(binary);
 314                 r_members = 0;
 315         }
 316
 317         r_iface_ref = 0;
 318 }
 319
 320 void VariableResolver::visit(Assignment &assign)
 321 {
 322         {
 323                 SetFlag set(record_target);
 324                 r_assignment_target = 0;
 325                 assign.left->visit(*this);
 326                 assign.target_declaration = r_assignment_target;
 327         }
 328
 329         r_self_referencing = false;
 330         assign.right->visit(*this);
 331         assign.self_referencing = (r_self_referencing || assign.oper->token[0]!='=');
 332
 333         r_members = 0;
 334         r_iface_ref = 0;
 335 }
 336
 337 void VariableResolver::visit(FunctionCall &call)
 338 {
 339         TraversingVisitor::visit(call);
 340         r_members = 0;
 341         r_iface_ref = 0;
 342 }
 343
 344 void VariableResolver::visit(VariableDeclaration &var)
 345 {
 346         if(!block_interface.empty() && var.interface.empty())
 347                 var.interface = block_interface;
 348
 349         TraversingVisitor::visit(var);
 350         current_block->variables.insert(make_pair(var.name, &var));
 351 }
 352
 353 void VariableResolver::visit(InterfaceBlock &iface)
 354 {
 355         /* Block names can be reused in different interfaces.  Prefix the name with
 356         the first character of the interface to avoid conflicts. */
 357         stage->interface_blocks.insert(make_pair(iface.interface+iface.name, &iface));
 358         if(!iface.instance_name.empty())
 359                 stage->interface_blocks.insert(make_pair("_"+iface.instance_name, &iface));
 360
 361         SetForScope<string> set_iface(block_interface, iface.interface);
 362         TraversingVisitor::visit(iface);
 363 }
 364
 365
 366 void FunctionResolver::apply(Stage &s)
 367 {
 368         stage = &s;
 369         s.functions.clear();
 370         s.content.visit(*this);
 371 }
 372
 373 void FunctionResolver::visit(FunctionCall &call)
 374 {
 375         map<string, FunctionDeclaration *>::iterator i = stage->functions.find(call.name);
 376         if(i!=stage->functions.end())
 377                 call.declaration = i->second;
 378
 379         TraversingVisitor::visit(call);
 380 }
 381
 382 void FunctionResolver::visit(FunctionDeclaration &func)
 383 {
 384         FunctionDeclaration *&stage_decl = stage->functions[func.name];
 385         vector<FunctionDeclaration *> &decls = declarations[func.name];
 386         if(func.definition==&func)
 387         {
 388                 stage_decl = &func;
 389
 390                 // Set all previous declarations to use this definition.
 391                 for(vector<FunctionDeclaration *>::iterator i=decls.begin(); i!=decls.end(); ++i)
 392                 {
 393                         (*i)->definition = func.definition;
 394                         (*i)->body.body.clear();
 395                 }
 396         }
 397         else
 398         {
 399                 func.definition = 0;
 400                 if(!stage_decl)
 401                         stage_decl = &func;
 402                 else
 403                         func.definition = stage_decl->definition;
 404         }
 405         decls.push_back(&func);
 406
 407         TraversingVisitor::visit(func);
 408 }
 409
 410
 411 InterfaceGenerator::InterfaceGenerator():
 412         stage(0),
 413         function_scope(false),
 414         iface_block(0),
 415         copy_block(false),
 416         iface_target_block(0)
 417 { }
 418
 419 string InterfaceGenerator::get_out_prefix(Stage::Type type)
 420 {
 421         if(type==Stage::VERTEX)
 422                 return "_vs_out_";
 423         else if(type==Stage::GEOMETRY)
 424                 return "_gs_out_";
 425         else
 426                 return string();
 427 }
 428
 429 void InterfaceGenerator::apply(Stage &s)
 430 {
 431         stage = &s;
 432         iface_target_block = &stage->content;
 433         if(stage->previous)
 434                 in_prefix = get_out_prefix(stage->previous->type);
 435         out_prefix = get_out_prefix(stage->type);
 436         s.content.visit(*this);
 437         NodeRemover().apply(s, nodes_to_remove);
 438 }
 439
 440 void InterfaceGenerator::visit(Block &block)
 441 {
 442         SetForScope<Block *> set_block(current_block, &block);
 443         for(NodeList<Statement>::iterator i=block.body.begin(); i!=block.body.end(); ++i)
 444         {
 445                 assignment_insert_point = i;
 446                 if(&block==&stage->content)
 447                         iface_insert_point = i;
 448
 449                 (*i)->visit(*this);
 450         }
 451 }
 452
 453 string InterfaceGenerator::change_prefix(const string &name, const string &prefix) const
 454 {
 455         unsigned offset = (name.compare(0, in_prefix.size(), in_prefix) ? 0 : in_prefix.size());
 456         return prefix+name.substr(offset);
 457 }
 458
 459 VariableDeclaration *InterfaceGenerator::generate_interface(VariableDeclaration &var, const string &iface, const string &name)
 460 {
 461         if(stage->content.variables.count(name))
 462                 return 0;
 463
 464         VariableDeclaration* iface_var = new VariableDeclaration;
 465         iface_var->sampling = var.sampling;
 466         iface_var->interface = iface;
 467         iface_var->type = var.type;
 468         iface_var->name = name;
 469         /* Geometry shader inputs are always arrays.  But if we're bringing in an
 470         entire block, the array is on the block and not individual variables. */
 471         if(stage->type==Stage::GEOMETRY && !copy_block)
 472                 iface_var->array = ((var.array && var.interface!="in") || iface=="in");
 473         else
 474                 iface_var->array = var.array;
 475         if(iface_var->array)
 476                 iface_var->array_size = var.array_size;
 477         if(iface=="in")
 478         {
 479                 iface_var->layout = var.layout;
 480                 iface_var->linked_declaration = &var;
 481                 var.linked_declaration = iface_var;
 482         }
 483
 484         iface_target_block->body.insert(iface_insert_point, iface_var);
 485         iface_target_block->variables.insert(make_pair(name, iface_var));
 486
 487         return iface_var;
 488 }
 489
 490 InterfaceBlock *InterfaceGenerator::generate_interface(InterfaceBlock &out_block)
 491 {
 492         if(stage->interface_blocks.count("in"+out_block.name))
 493                 return 0;
 494
 495         InterfaceBlock *in_block = new InterfaceBlock;
 496         in_block->interface = "in";
 497         in_block->name = out_block.name;
 498         in_block->instance_name = out_block.instance_name;
 499         if(stage->type==Stage::GEOMETRY)
 500                 in_block->array = true;
 501         else
 502                 in_block->array = out_block.array;
 503         in_block->linked_block = &out_block;
 504         out_block.linked_block = in_block;
 505
 506         {
 507                 SetFlag set_copy(copy_block, true);
 508                 SetForScope<Block *> set_target(iface_target_block, &in_block->members);
 509                 SetForScope<NodeList<Statement>::iterator> set_ins_pt(iface_insert_point, in_block->members.body.end());
 510                 out_block.members.visit(*this);
 511         }
 512
 513         iface_target_block->body.insert(iface_insert_point, in_block);
 514         stage->interface_blocks.insert(make_pair("in"+in_block->name, in_block));
 515         if(!in_block->instance_name.empty())
 516                 stage->interface_blocks.insert(make_pair("_"+in_block->instance_name, in_block));
 517
 518         SetFlag set_scope(function_scope, false);
 519         SetForScope<Block *> set_block(current_block, &stage->content);
 520         in_block->visit(*this);
 521
 522         return in_block;
 523 }
 524
 525 ExpressionStatement &InterfaceGenerator::insert_assignment(const string &left, Expression *right)
 526 {
 527         Assignment *assign = new Assignment;
 528         VariableReference *ref = new VariableReference;
 529         ref->name = left;
 530         assign->left = ref;
 531         assign->oper = &Operator::get_operator("=", Operator::BINARY);
 532         assign->right = right;
 533
 534         ExpressionStatement *stmt = new ExpressionStatement;
 535         stmt->expression = assign;
 536         current_block->body.insert(assignment_insert_point, stmt);
 537         stmt->visit(*this);
 538
 539         return *stmt;
 540 }
 541
 542 void InterfaceGenerator::visit(VariableReference &var)
 543 {
 544         if(var.declaration || !stage->previous)
 545                 return;
 546         /* Don't pull a variable from previous stage if we just generated an output
 547         interface in this stage */
 548         if(stage->content.variables.count(var.name))
 549                 return;
 550
 551         const map<string, VariableDeclaration *> &prev_vars = stage->previous->content.variables;
 552         map<string, VariableDeclaration *>::const_iterator i = prev_vars.find(var.name);
 553         if(i==prev_vars.end() || i->second->interface!="out")
 554                 i = prev_vars.find(in_prefix+var.name);
 555         if(i!=prev_vars.end() && i->second->interface=="out")
 556         {
 557                 generate_interface(*i->second, "in", i->second->name);
 558                 var.name = i->second->name;
 559                 return;
 560         }
 561
 562         const map<string, InterfaceBlock *> &prev_blocks = stage->previous->interface_blocks;
 563         map<string, InterfaceBlock *>::const_iterator j = prev_blocks.find("_"+var.name);
 564         if(j!=prev_blocks.end() && j->second->interface=="out")
 565         {
 566                 generate_interface(*j->second);
 567                 /* Let VariableResolver convert the variable reference into an interface
 568                 block reference. */
 569                 return;
 570         }
 571
 572         for(j=prev_blocks.begin(); j!=prev_blocks.end(); ++j)
 573                 if(j->second->instance_name.empty())
 574                 {
 575                         i = j->second->members.variables.find(var.name);
 576                         if(i!=j->second->members.variables.end())
 577                         {
 578                                 generate_interface(*j->second);
 579                                 return;
 580                         }
 581                 }
 582 }
 583
 584 void InterfaceGenerator::visit(VariableDeclaration &var)
 585 {
 586         if(copy_block)
 587         {
 588                 generate_interface(var, "in", var.name);
 589                 return;
 590         }
 591
 592         if(iface_block)
 593         {
 594                 if(iface_block->linked_block)
 595                 {
 596                         // Link all variables to their counterparts in the linked block.
 597                         const map<string, VariableDeclaration *> &linked_vars = iface_block->linked_block->members.variables;
 598                         map<string, VariableDeclaration *>::const_iterator i = linked_vars.find(var.name);
 599                         if(i!=linked_vars.end())
 600                         {
 601                                 var.linked_declaration = i->second;
 602                                 var.linked_declaration->linked_declaration = &var;
 603                         }
 604                 }
 605                 return;
 606         }
 607
 608         if(var.interface=="out")
 609         {
 610                 /* For output variables in function scope, generate a global interface
 611                 and replace the local declaration with an assignment. */
 612                 VariableDeclaration *out_var = 0;
 613                 if(function_scope && (out_var=generate_interface(var, "out", var.name)))
 614                 {
 615                         out_var->source = var.source;
 616                         out_var->line = var.line;
 617                         nodes_to_remove.insert(&var);
 618                         if(var.init_expression)
 619                         {
 620                                 ExpressionStatement &stmt = insert_assignment(var.name, var.init_expression->clone());
 621                                 stmt.source = var.source;
 622                                 stmt.line = var.line;
 623                                 return;
 624                         }
 625                 }
 626         }
 627         else if(var.interface=="in")
 628         {
 629                 /* Try to link input variables in global scope with output variables from
 630                 previous stage. */
 631                 if(current_block==&stage->content && !var.linked_declaration && stage->previous)
 632                 {
 633                         const map<string, VariableDeclaration *> &prev_vars = stage->previous->content.variables;
 634                         map<string, VariableDeclaration *>::const_iterator i = prev_vars.find(var.name);
 635                         if(i!=prev_vars.end() && i->second->interface=="out")
 636                         {
 637                                 var.linked_declaration = i->second;
 638                                 i->second->linked_declaration = &var;
 639                         }
 640                 }
 641         }
 642
 643         TraversingVisitor::visit(var);
 644 }
 645
 646 void InterfaceGenerator::visit(InterfaceBlock &iface)
 647 {
 648         if(iface.interface=="in")
 649         {
 650                 /* Try to link input blocks with output blocks sharing the same block
 651                 name from previous stage. */
 652                 if(!iface.linked_block && stage->previous)
 653                 {
 654                         const map<string, InterfaceBlock *> &prev_blocks = stage->previous->interface_blocks;
 655                         map<string, InterfaceBlock *>::const_iterator i = prev_blocks.find("out"+iface.name);
 656                         if(i!=prev_blocks.end())
 657                         {
 658                                 iface.linked_block = i->second;
 659                                 i->second->linked_block = &iface;
 660                         }
 661                 }
 662         }
 663
 664         SetForScope<InterfaceBlock *> set_iface(iface_block, &iface);
 665         TraversingVisitor::visit(iface);
 666 }
 667
 668 void InterfaceGenerator::visit(FunctionDeclaration &func)
 669 {
 670         SetFlag set_scope(function_scope, true);
 671         // Skip parameters because they're not useful here
 672         func.body.visit(*this);
 673 }
 674
 675 void InterfaceGenerator::visit(Passthrough &pass)
 676 {
 677         vector<VariableDeclaration *> pass_vars;
 678
 679         // Pass through all input variables of this stage.
 680         for(map<string, VariableDeclaration *>::const_iterator i=stage->content.variables.begin(); i!=stage->content.variables.end(); ++i)
 681                 if(i->second->interface=="in")
 682                         pass_vars.push_back(i->second);
 683
 684         if(stage->previous)
 685         {
 686                 const map<string, VariableDeclaration *> &prev_vars = stage->previous->content.variables;
 687                 for(map<string, VariableDeclaration *>::const_iterator i=prev_vars.begin(); i!=prev_vars.end(); ++i)
 688                 {
 689                         if(i->second->interface!="out")
 690                                 continue;
 691
 692                         /* Pass through output variables from the previous stage, but only
 693                         those which are not already linked to an input here. */
 694                         if(!i->second->linked_declaration && generate_interface(*i->second, "in", i->second->name))
 695                                 pass_vars.push_back(i->second);
 696                 }
 697         }
 698
 699         if(stage->type==Stage::GEOMETRY)
 700         {
 701                 /* Special case for geometry shader: copy gl_Position from input to
 702                 output. */
 703                 InterfaceBlockReference *ref = new InterfaceBlockReference;
 704                 ref->name = "gl_in";
 705
 706                 BinaryExpression *subscript = new BinaryExpression;
 707                 subscript->left = ref;
 708                 subscript->oper = &Operator::get_operator("[", Operator::BINARY);
 709                 subscript->right = pass.subscript;
 710
 711                 MemberAccess *memacc = new MemberAccess;
 712                 memacc->left = subscript;
 713                 memacc->member = "gl_Position";
 714
 715                 insert_assignment("gl_Position", memacc);
 716         }
 717
 718         for(vector<VariableDeclaration *>::const_iterator i=pass_vars.begin(); i!=pass_vars.end(); ++i)
 719         {
 720                 string out_name = change_prefix((*i)->name, out_prefix);
 721                 generate_interface(**i, "out", out_name);
 722
 723                 VariableReference *ref = new VariableReference;
 724                 ref->name = (*i)->name;
 725                 if(pass.subscript)
 726                 {
 727                         BinaryExpression *subscript = new BinaryExpression;
 728                         subscript->left = ref;
 729                         subscript->oper = &Operator::get_operator("[", Operator::BINARY);
 730                         subscript->right = pass.subscript;
 731                         insert_assignment(out_name, subscript);
 732                 }
 733                 else
 734                         insert_assignment(out_name, ref);
 735         }
 736
 737         nodes_to_remove.insert(&pass);
 738 }
 739
 740 } // namespace SL
 741 } // namespace GL
 742 } // namespace Msp