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                 if(StructDeclaration *strct = dynamic_cast<StructDeclaration *>(var.declaration->type_declaration))
 203                         r_members = &strct->members.variables;
 204         }
 205         else
 206         {
 207                 const map<string, InterfaceBlock *> &blocks = stage->interface_blocks;
 208                 map<string, InterfaceBlock *>::const_iterator i = blocks.find("_"+var.name);
 209                 if(i!=blocks.end())
 210                 {
 211                         /* The name refers to an interface block with an instance name rather
 212                         than a variable.  Prepare a new syntax tree node accordingly. */
 213                         r_iface_ref = new InterfaceBlockReference;
 214                         r_iface_ref->source = var.source;
 215                         r_iface_ref->line = var.line;
 216                         r_iface_ref->name = var.name;
 217                         r_iface_ref->declaration = i->second;
 218                         r_members = &i->second->members.variables;
 219                 }
 220                 else
 221                 {
 222                         // Look for the variable in anonymous interface blocks.
 223                         for(i=blocks.begin(); (!var.declaration && i!=blocks.end()); ++i)
 224                                 if(i->second->instance_name.empty())
 225                                 {
 226                                         map<string, VariableDeclaration *>::iterator j = i->second->members.variables.find(var.name);
 227                                         if(j!=i->second->members.variables.end())
 228                                                 var.declaration = j->second;
 229                                 }
 230                 }
 231         }
 232
 233         if(record_target)
 234         {
 235                 if(r_assignment_target)
 236                 {
 237                         /* More than one variable reference found in assignment target.
 238                         Unable to determine what the primary target is. */
 239                         record_target = false;
 240                         r_assignment_target = 0;
 241                 }
 242                 else
 243                         r_assignment_target = var.declaration;
 244         }
 245         else if(var.declaration && var.declaration==r_assignment_target)
 246                 r_self_referencing = true;
 247 }
 248
 249 void VariableResolver::visit(InterfaceBlockReference &iface)
 250 {
 251         iface.declaration = 0;
 252         for(Block *block=current_block; block; block=block->parent)
 253         {
 254                 map<string, InterfaceBlock *>::iterator i = stage->interface_blocks.find("_"+iface.name);
 255                 if(i!=stage->interface_blocks.end())
 256                 {
 257                         iface.declaration = i->second;
 258                         r_members = &i->second->members.variables;
 259                         break;
 260                 }
 261         }
 262 }
 263
 264 void VariableResolver::visit(MemberAccess &memacc)
 265 {
 266         r_members = 0;
 267         r_iface_ref = 0;
 268         memacc.left->visit(*this);
 269
 270         if(r_iface_ref)
 271                 memacc.left = r_iface_ref;
 272         r_iface_ref = 0;
 273
 274         memacc.declaration = 0;
 275         if(r_members)
 276         {
 277                 map<string, VariableDeclaration *>::iterator i = r_members->find(memacc.member);
 278                 if(i!=r_members->end())
 279                 {
 280                         memacc.declaration = i->second;
 281                         if(StructDeclaration *strct = dynamic_cast<StructDeclaration *>(i->second->type_declaration))
 282                                 r_members = &strct->members.variables;
 283                 }
 284                 else
 285                         r_members = 0;
 286         }
 287 }
 288
 289 void VariableResolver::visit(UnaryExpression &unary)
 290 {
 291         TraversingVisitor::visit(unary);
 292         r_members = 0;
 293         r_iface_ref = 0;
 294 }
 295
 296 void VariableResolver::visit(BinaryExpression &binary)
 297 {
 298         if(binary.oper->token[0]=='[')
 299         {
 300                 {
 301                         /* The subscript expression is not a part of the primary assignment
 302                         target. */
 303                         SetFlag set(record_target, false);
 304                         binary.right->visit(*this);
 305                 }
 306                 r_members = 0;
 307                 r_iface_ref = 0;
 308                 binary.left->visit(*this);
 309                 if(r_iface_ref)
 310                         binary.left = r_iface_ref;
 311         }
 312         else
 313         {
 314                 TraversingVisitor::visit(binary);
 315                 r_members = 0;
 316         }
 317
 318         r_iface_ref = 0;
 319 }
 320
 321 void VariableResolver::visit(Assignment &assign)
 322 {
 323         {
 324                 SetFlag set(record_target);
 325                 r_assignment_target = 0;
 326                 assign.left->visit(*this);
 327                 assign.target_declaration = r_assignment_target;
 328         }
 329
 330         r_self_referencing = false;
 331         assign.right->visit(*this);
 332         assign.self_referencing = (r_self_referencing || assign.oper->token[0]!='=');
 333
 334         r_members = 0;
 335         r_iface_ref = 0;
 336 }
 337
 338 void VariableResolver::visit(FunctionCall &call)
 339 {
 340         TraversingVisitor::visit(call);
 341         r_members = 0;
 342         r_iface_ref = 0;
 343 }
 344
 345 void VariableResolver::visit(VariableDeclaration &var)
 346 {
 347         if(!block_interface.empty() && var.interface.empty())
 348                 var.interface = block_interface;
 349
 350         TraversingVisitor::visit(var);
 351         current_block->variables.insert(make_pair(var.name, &var));
 352 }
 353
 354 void VariableResolver::visit(InterfaceBlock &iface)
 355 {
 356         /* Block names can be reused in different interfaces.  Prefix the name with
 357         the first character of the interface to avoid conflicts. */
 358         stage->interface_blocks.insert(make_pair(iface.interface+iface.name, &iface));
 359         if(!iface.instance_name.empty())
 360                 stage->interface_blocks.insert(make_pair("_"+iface.instance_name, &iface));
 361
 362         SetForScope<string> set_iface(block_interface, iface.interface);
 363         TraversingVisitor::visit(iface);
 364 }
 365
 366
 367 void FunctionResolver::apply(Stage &s)
 368 {
 369         stage = &s;
 370         s.functions.clear();
 371         s.content.visit(*this);
 372 }
 373
 374 void FunctionResolver::visit(FunctionCall &call)
 375 {
 376         map<string, FunctionDeclaration *>::iterator i = stage->functions.find(call.name);
 377         if(i!=stage->functions.end())
 378                 call.declaration = i->second;
 379
 380         TraversingVisitor::visit(call);
 381 }
 382
 383 void FunctionResolver::visit(FunctionDeclaration &func)
 384 {
 385         FunctionDeclaration *&stage_decl = stage->functions[func.name];
 386         vector<FunctionDeclaration *> &decls = declarations[func.name];
 387         if(func.definition==&func)
 388         {
 389                 stage_decl = &func;
 390
 391                 // Set all previous declarations to use this definition.
 392                 for(vector<FunctionDeclaration *>::iterator i=decls.begin(); i!=decls.end(); ++i)
 393                 {
 394                         (*i)->definition = func.definition;
 395                         (*i)->body.body.clear();
 396                 }
 397         }
 398         else
 399         {
 400                 func.definition = 0;
 401                 if(!stage_decl)
 402                         stage_decl = &func;
 403                 else
 404                         func.definition = stage_decl->definition;
 405         }
 406         decls.push_back(&func);
 407
 408         TraversingVisitor::visit(func);
 409 }
 410
 411
 412 InterfaceGenerator::InterfaceGenerator():
 413         stage(0),
 414         function_scope(false),
 415         iface_block(0),
 416         copy_block(false),
 417         iface_target_block(0)
 418 { }
 419
 420 string InterfaceGenerator::get_out_prefix(Stage::Type type)
 421 {
 422         if(type==Stage::VERTEX)
 423                 return "_vs_out_";
 424         else if(type==Stage::GEOMETRY)
 425                 return "_gs_out_";
 426         else
 427                 return string();
 428 }
 429
 430 void InterfaceGenerator::apply(Stage &s)
 431 {
 432         stage = &s;
 433         iface_target_block = &stage->content;
 434         if(stage->previous)
 435                 in_prefix = get_out_prefix(stage->previous->type);
 436         out_prefix = get_out_prefix(stage->type);
 437         s.content.visit(*this);
 438         NodeRemover().apply(s, nodes_to_remove);
 439 }
 440
 441 void InterfaceGenerator::visit(Block &block)
 442 {
 443         SetForScope<Block *> set_block(current_block, &block);
 444         for(NodeList<Statement>::iterator i=block.body.begin(); i!=block.body.end(); ++i)
 445         {
 446                 assignment_insert_point = i;
 447                 if(&block==&stage->content)
 448                         iface_insert_point = i;
 449
 450                 (*i)->visit(*this);
 451         }
 452 }
 453
 454 string InterfaceGenerator::change_prefix(const string &name, const string &prefix) const
 455 {
 456         unsigned offset = (name.compare(0, in_prefix.size(), in_prefix) ? 0 : in_prefix.size());
 457         return prefix+name.substr(offset);
 458 }
 459
 460 VariableDeclaration *InterfaceGenerator::generate_interface(VariableDeclaration &var, const string &iface, const string &name)
 461 {
 462         if(stage->content.variables.count(name))
 463                 return 0;
 464
 465         VariableDeclaration* iface_var = new VariableDeclaration;
 466         iface_var->sampling = var.sampling;
 467         iface_var->interface = iface;
 468         iface_var->type = var.type;
 469         iface_var->name = name;
 470         /* Geometry shader inputs are always arrays.  But if we're bringing in an
 471         entire block, the array is on the block and not individual variables. */
 472         if(stage->type==Stage::GEOMETRY && !copy_block)
 473                 iface_var->array = ((var.array && var.interface!="in") || iface=="in");
 474         else
 475                 iface_var->array = var.array;
 476         if(iface_var->array)
 477                 iface_var->array_size = var.array_size;
 478         if(iface=="in")
 479         {
 480                 iface_var->layout = var.layout;
 481                 iface_var->linked_declaration = &var;
 482                 var.linked_declaration = iface_var;
 483         }
 484
 485         iface_target_block->body.insert(iface_insert_point, iface_var);
 486         iface_target_block->variables.insert(make_pair(name, iface_var));
 487
 488         return iface_var;
 489 }
 490
 491 InterfaceBlock *InterfaceGenerator::generate_interface(InterfaceBlock &out_block)
 492 {
 493         if(stage->interface_blocks.count("in"+out_block.name))
 494                 return 0;
 495
 496         InterfaceBlock *in_block = new InterfaceBlock;
 497         in_block->interface = "in";
 498         in_block->name = out_block.name;
 499         in_block->instance_name = out_block.instance_name;
 500         if(stage->type==Stage::GEOMETRY)
 501                 in_block->array = true;
 502         else
 503                 in_block->array = out_block.array;
 504         in_block->linked_block = &out_block;
 505         out_block.linked_block = in_block;
 506
 507         {
 508                 SetFlag set_copy(copy_block, true);
 509                 SetForScope<Block *> set_target(iface_target_block, &in_block->members);
 510                 SetForScope<NodeList<Statement>::iterator> set_ins_pt(iface_insert_point, in_block->members.body.end());
 511                 out_block.members.visit(*this);
 512         }
 513
 514         iface_target_block->body.insert(iface_insert_point, in_block);
 515         stage->interface_blocks.insert(make_pair("in"+in_block->name, in_block));
 516         if(!in_block->instance_name.empty())
 517                 stage->interface_blocks.insert(make_pair("_"+in_block->instance_name, in_block));
 518
 519         SetFlag set_scope(function_scope, false);
 520         SetForScope<Block *> set_block(current_block, &stage->content);
 521         in_block->visit(*this);
 522
 523         return in_block;
 524 }
 525
 526 ExpressionStatement &InterfaceGenerator::insert_assignment(const string &left, Expression *right)
 527 {
 528         Assignment *assign = new Assignment;
 529         VariableReference *ref = new VariableReference;
 530         ref->name = left;
 531         assign->left = ref;
 532         assign->oper = &Operator::get_operator("=", Operator::BINARY);
 533         assign->right = right;
 534
 535         ExpressionStatement *stmt = new ExpressionStatement;
 536         stmt->expression = assign;
 537         current_block->body.insert(assignment_insert_point, stmt);
 538         stmt->visit(*this);
 539
 540         return *stmt;
 541 }
 542
 543 void InterfaceGenerator::visit(VariableReference &var)
 544 {
 545         if(var.declaration || !stage->previous)
 546                 return;
 547         /* Don't pull a variable from previous stage if we just generated an output
 548         interface in this stage */
 549         if(stage->content.variables.count(var.name))
 550                 return;
 551
 552         const map<string, VariableDeclaration *> &prev_vars = stage->previous->content.variables;
 553         map<string, VariableDeclaration *>::const_iterator i = prev_vars.find(var.name);
 554         if(i==prev_vars.end() || i->second->interface!="out")
 555                 i = prev_vars.find(in_prefix+var.name);
 556         if(i!=prev_vars.end() && i->second->interface=="out")
 557         {
 558                 generate_interface(*i->second, "in", i->second->name);
 559                 var.name = i->second->name;
 560                 return;
 561         }
 562
 563         const map<string, InterfaceBlock *> &prev_blocks = stage->previous->interface_blocks;
 564         map<string, InterfaceBlock *>::const_iterator j = prev_blocks.find("_"+var.name);
 565         if(j!=prev_blocks.end() && j->second->interface=="out")
 566         {
 567                 generate_interface(*j->second);
 568                 /* Let VariableResolver convert the variable reference into an interface
 569                 block reference. */
 570                 return;
 571         }
 572
 573         for(j=prev_blocks.begin(); j!=prev_blocks.end(); ++j)
 574                 if(j->second->instance_name.empty())
 575                 {
 576                         i = j->second->members.variables.find(var.name);
 577                         if(i!=j->second->members.variables.end())
 578                         {
 579                                 generate_interface(*j->second);
 580                                 return;
 581                         }
 582                 }
 583 }
 584
 585 void InterfaceGenerator::visit(VariableDeclaration &var)
 586 {
 587         if(copy_block)
 588         {
 589                 generate_interface(var, "in", var.name);
 590                 return;
 591         }
 592
 593         if(iface_block)
 594         {
 595                 if(iface_block->linked_block)
 596                 {
 597                         // Link all variables to their counterparts in the linked block.
 598                         const map<string, VariableDeclaration *> &linked_vars = iface_block->linked_block->members.variables;
 599                         map<string, VariableDeclaration *>::const_iterator i = linked_vars.find(var.name);
 600                         if(i!=linked_vars.end())
 601                         {
 602                                 var.linked_declaration = i->second;
 603                                 var.linked_declaration->linked_declaration = &var;
 604                         }
 605                 }
 606                 return;
 607         }
 608
 609         if(var.interface=="out")
 610         {
 611                 /* For output variables in function scope, generate a global interface
 612                 and replace the local declaration with an assignment. */
 613                 VariableDeclaration *out_var = 0;
 614                 if(function_scope && (out_var=generate_interface(var, "out", var.name)))
 615                 {
 616                         out_var->source = var.source;
 617                         out_var->line = var.line;
 618                         nodes_to_remove.insert(&var);
 619                         if(var.init_expression)
 620                         {
 621                                 ExpressionStatement &stmt = insert_assignment(var.name, var.init_expression->clone());
 622                                 stmt.source = var.source;
 623                                 stmt.line = var.line;
 624                                 return;
 625                         }
 626                 }
 627         }
 628         else if(var.interface=="in")
 629         {
 630                 /* Try to link input variables in global scope with output variables from
 631                 previous stage. */
 632                 if(current_block==&stage->content && !var.linked_declaration && stage->previous)
 633                 {
 634                         const map<string, VariableDeclaration *> &prev_vars = stage->previous->content.variables;
 635                         map<string, VariableDeclaration *>::const_iterator i = prev_vars.find(var.name);
 636                         if(i!=prev_vars.end() && i->second->interface=="out")
 637                         {
 638                                 var.linked_declaration = i->second;
 639                                 i->second->linked_declaration = &var;
 640                         }
 641                 }
 642         }
 643
 644         TraversingVisitor::visit(var);
 645 }
 646
 647 void InterfaceGenerator::visit(InterfaceBlock &iface)
 648 {
 649         if(iface.interface=="in")
 650         {
 651                 /* Try to link input blocks with output blocks sharing the same block
 652                 name from previous stage. */
 653                 if(!iface.linked_block && stage->previous)
 654                 {
 655                         const map<string, InterfaceBlock *> &prev_blocks = stage->previous->interface_blocks;
 656                         map<string, InterfaceBlock *>::const_iterator i = prev_blocks.find("out"+iface.name);
 657                         if(i!=prev_blocks.end())
 658                         {
 659                                 iface.linked_block = i->second;
 660                                 i->second->linked_block = &iface;
 661                         }
 662                 }
 663         }
 664
 665         SetForScope<InterfaceBlock *> set_iface(iface_block, &iface);
 666         TraversingVisitor::visit(iface);
 667 }
 668
 669 void InterfaceGenerator::visit(FunctionDeclaration &func)
 670 {
 671         SetFlag set_scope(function_scope, true);
 672         // Skip parameters because they're not useful here
 673         func.body.visit(*this);
 674 }
 675
 676 void InterfaceGenerator::visit(Passthrough &pass)
 677 {
 678         vector<VariableDeclaration *> pass_vars;
 679
 680         // Pass through all input variables of this stage.
 681         for(map<string, VariableDeclaration *>::const_iterator i=stage->content.variables.begin(); i!=stage->content.variables.end(); ++i)
 682                 if(i->second->interface=="in")
 683                         pass_vars.push_back(i->second);
 684
 685         if(stage->previous)
 686         {
 687                 const map<string, VariableDeclaration *> &prev_vars = stage->previous->content.variables;
 688                 for(map<string, VariableDeclaration *>::const_iterator i=prev_vars.begin(); i!=prev_vars.end(); ++i)
 689                 {
 690                         if(i->second->interface!="out")
 691                                 continue;
 692
 693                         /* Pass through output variables from the previous stage, but only
 694                         those which are not already linked to an input here. */
 695                         if(!i->second->linked_declaration && generate_interface(*i->second, "in", i->second->name))
 696                                 pass_vars.push_back(i->second);
 697                 }
 698         }
 699
 700         if(stage->type==Stage::GEOMETRY)
 701         {
 702                 /* Special case for geometry shader: copy gl_Position from input to
 703                 output. */
 704                 InterfaceBlockReference *ref = new InterfaceBlockReference;
 705                 ref->name = "gl_in";
 706
 707                 BinaryExpression *subscript = new BinaryExpression;
 708                 subscript->left = ref;
 709                 subscript->oper = &Operator::get_operator("[", Operator::BINARY);
 710                 subscript->right = pass.subscript;
 711
 712                 MemberAccess *memacc = new MemberAccess;
 713                 memacc->left = subscript;
 714                 memacc->member = "gl_Position";
 715
 716                 insert_assignment("gl_Position", memacc);
 717         }
 718
 719         for(vector<VariableDeclaration *>::const_iterator i=pass_vars.begin(); i!=pass_vars.end(); ++i)
 720         {
 721                 string out_name = change_prefix((*i)->name, out_prefix);
 722                 generate_interface(**i, "out", out_name);
 723
 724                 VariableReference *ref = new VariableReference;
 725                 ref->name = (*i)->name;
 726                 if(pass.subscript)
 727                 {
 728                         BinaryExpression *subscript = new BinaryExpression;
 729                         subscript->left = ref;
 730                         subscript->oper = &Operator::get_operator("[", Operator::BINARY);
 731                         subscript->right = pass.subscript;
 732                         insert_assignment(out_name, subscript);
 733                 }
 734                 else
 735                         insert_assignment(out_name, ref);
 736         }
 737
 738         nodes_to_remove.insert(&pass);
 739 }
 740
 741 } // namespace SL
 742 } // namespace GL
 743 } // namespace Msp