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 TypeDeclaration *TypeResolver::resolve_type(const string &name)
 129 {
 130         map<string, TypeDeclaration *>::iterator i = stage->types.find(name);
 131         if(i!=stage->types.end())
 132         {
 133                 map<TypeDeclaration *, TypeDeclaration *>::iterator j = alias_map.find(i->second);
 134                 return (j!=alias_map.end() ? j->second : i->second);
 135         }
 136         else
 137                 return 0;
 138 }
 139
 140 void TypeResolver::visit(BasicTypeDeclaration &type)
 141 {
 142         type.base_type = resolve_type(type.base);
 143
 144         if(type.kind==BasicTypeDeclaration::VECTOR && type.base_type)
 145                 if(BasicTypeDeclaration *basic_base = dynamic_cast<BasicTypeDeclaration *>(type.base_type))
 146                         if(basic_base->kind==BasicTypeDeclaration::VECTOR)
 147                         {
 148                                 type.kind = BasicTypeDeclaration::MATRIX;
 149                                 type.size |= basic_base->size<<16;
 150                         }
 151
 152         if(type.kind==BasicTypeDeclaration::ALIAS && type.base_type)
 153                 alias_map[&type] = type.base_type;
 154
 155         stage->types.insert(make_pair(type.name, &type));
 156 }
 157
 158 void TypeResolver::visit(ImageTypeDeclaration &type)
 159 {
 160         type.base_type = resolve_type(type.base);
 161         stage->types.insert(make_pair(type.name, &type));
 162 }
 163
 164 void TypeResolver::visit(StructDeclaration &strct)
 165 {
 166         stage->types.insert(make_pair(strct.name, &strct));
 167         TraversingVisitor::visit(strct);
 168 }
 169
 170 void TypeResolver::visit(VariableDeclaration &var)
 171 {
 172         var.type_declaration = resolve_type(var.type);
 173 }
 174
 175 void TypeResolver::visit(FunctionDeclaration &func)
 176 {
 177         func.return_type_declaration = resolve_type(func.return_type);
 178         TraversingVisitor::visit(func);
 179 }
 180
 181
 182 VariableResolver::VariableResolver():
 183         stage(0),
 184         r_members(0),
 185         record_target(false),
 186         r_self_referencing(false),
 187         r_assignment_target(0)
 188 { }
 189
 190 void VariableResolver::apply(Stage &s)
 191 {
 192         stage = &s;
 193         s.interface_blocks.clear();
 194         s.content.visit(*this);
 195 }
 196
 197 void VariableResolver::enter(Block &block)
 198 {
 199         block.variables.clear();
 200 }
 201
 202 void VariableResolver::visit(VariableReference &var)
 203 {
 204         var.declaration = 0;
 205         r_members = 0;
 206         /* Look for variable declarations in the block hierarchy first.  Interface
 207         blocks are always defined in the top level so we can't accidentally skip
 208         one. */
 209         for(Block *block=current_block; (!var.declaration && block); block=block->parent)
 210         {
 211                 map<string, VariableDeclaration *>::iterator i = block->variables.find(var.name);
 212                 if(i!=block->variables.end())
 213                         var.declaration = i->second;
 214         }
 215
 216         if(!var.declaration)
 217         {
 218                 const map<string, InterfaceBlock *> &blocks = stage->interface_blocks;
 219                 map<string, InterfaceBlock *>::const_iterator i = blocks.find("_"+var.name);
 220                 if(i!=blocks.end())
 221                 {
 222                         /* The name refers to an interface block with an instance name rather
 223                         than a variable.  Prepare a new syntax tree node accordingly. */
 224                         r_iface_ref = new InterfaceBlockReference;
 225                         r_iface_ref->source = var.source;
 226                         r_iface_ref->line = var.line;
 227                         r_iface_ref->name = var.name;
 228                         r_iface_ref->declaration = i->second;
 229                         r_members = &i->second->members.variables;
 230                 }
 231                 else
 232                 {
 233                         // Look for the variable in anonymous interface blocks.
 234                         for(i=blocks.begin(); (!var.declaration && i!=blocks.end()); ++i)
 235                                 if(i->second->instance_name.empty())
 236                                 {
 237                                         map<string, VariableDeclaration *>::iterator j = i->second->members.variables.find(var.name);
 238                                         if(j!=i->second->members.variables.end())
 239                                                 var.declaration = j->second;
 240                                 }
 241                 }
 242         }
 243
 244         if(var.declaration)
 245                 if(StructDeclaration *strct = dynamic_cast<StructDeclaration *>(var.declaration->type_declaration))
 246                         r_members = &strct->members.variables;
 247
 248         if(record_target)
 249         {
 250                 if(r_assignment_target)
 251                 {
 252                         /* More than one variable reference found in assignment target.
 253                         Unable to determine what the primary target is. */
 254                         record_target = false;
 255                         r_assignment_target = 0;
 256                 }
 257                 else
 258                         r_assignment_target = var.declaration;
 259         }
 260         else if(var.declaration && var.declaration==r_assignment_target)
 261                 r_self_referencing = true;
 262 }
 263
 264 void VariableResolver::visit(InterfaceBlockReference &iface)
 265 {
 266         iface.declaration = 0;
 267         for(Block *block=current_block; block; block=block->parent)
 268         {
 269                 map<string, InterfaceBlock *>::iterator i = stage->interface_blocks.find("_"+iface.name);
 270                 if(i!=stage->interface_blocks.end())
 271                 {
 272                         iface.declaration = i->second;
 273                         r_members = &i->second->members.variables;
 274                         break;
 275                 }
 276         }
 277 }
 278
 279 void VariableResolver::visit(MemberAccess &memacc)
 280 {
 281         r_members = 0;
 282         r_iface_ref = 0;
 283         memacc.left->visit(*this);
 284
 285         if(r_iface_ref)
 286                 memacc.left = r_iface_ref;
 287         r_iface_ref = 0;
 288
 289         memacc.declaration = 0;
 290         if(r_members)
 291         {
 292                 map<string, VariableDeclaration *>::iterator i = r_members->find(memacc.member);
 293                 if(i!=r_members->end())
 294                 {
 295                         memacc.declaration = i->second;
 296                         if(StructDeclaration *strct = dynamic_cast<StructDeclaration *>(i->second->type_declaration))
 297                                 r_members = &strct->members.variables;
 298                 }
 299                 else
 300                         r_members = 0;
 301         }
 302 }
 303
 304 void VariableResolver::visit(UnaryExpression &unary)
 305 {
 306         TraversingVisitor::visit(unary);
 307         r_members = 0;
 308         r_iface_ref = 0;
 309 }
 310
 311 void VariableResolver::visit(BinaryExpression &binary)
 312 {
 313         if(binary.oper->token[0]=='[')
 314         {
 315                 {
 316                         /* The subscript expression is not a part of the primary assignment
 317                         target. */
 318                         SetFlag set(record_target, false);
 319                         binary.right->visit(*this);
 320                 }
 321                 r_members = 0;
 322                 r_iface_ref = 0;
 323                 binary.left->visit(*this);
 324                 if(r_iface_ref)
 325                         binary.left = r_iface_ref;
 326         }
 327         else
 328         {
 329                 TraversingVisitor::visit(binary);
 330                 r_members = 0;
 331         }
 332
 333         r_iface_ref = 0;
 334 }
 335
 336 void VariableResolver::visit(Assignment &assign)
 337 {
 338         {
 339                 SetFlag set(record_target);
 340                 r_assignment_target = 0;
 341                 assign.left->visit(*this);
 342                 assign.target_declaration = r_assignment_target;
 343         }
 344
 345         r_self_referencing = false;
 346         assign.right->visit(*this);
 347         assign.self_referencing = (r_self_referencing || assign.oper->token[0]!='=');
 348
 349         r_members = 0;
 350         r_iface_ref = 0;
 351 }
 352
 353 void VariableResolver::visit(FunctionCall &call)
 354 {
 355         TraversingVisitor::visit(call);
 356         r_members = 0;
 357         r_iface_ref = 0;
 358 }
 359
 360 void VariableResolver::visit(VariableDeclaration &var)
 361 {
 362         if(!block_interface.empty() && var.interface.empty())
 363                 var.interface = block_interface;
 364
 365         TraversingVisitor::visit(var);
 366         current_block->variables.insert(make_pair(var.name, &var));
 367 }
 368
 369 void VariableResolver::visit(InterfaceBlock &iface)
 370 {
 371         /* Block names can be reused in different interfaces.  Prefix the name with
 372         the first character of the interface to avoid conflicts. */
 373         stage->interface_blocks.insert(make_pair(iface.interface+iface.name, &iface));
 374         if(!iface.instance_name.empty())
 375                 stage->interface_blocks.insert(make_pair("_"+iface.instance_name, &iface));
 376
 377         SetForScope<string> set_iface(block_interface, iface.interface);
 378         TraversingVisitor::visit(iface);
 379 }
 380
 381
 382 void FunctionResolver::apply(Stage &s)
 383 {
 384         stage = &s;
 385         s.functions.clear();
 386         s.content.visit(*this);
 387 }
 388
 389 void FunctionResolver::visit(FunctionCall &call)
 390 {
 391         map<string, FunctionDeclaration *>::iterator i = stage->functions.find(call.name);
 392         if(i!=stage->functions.end())
 393                 call.declaration = i->second;
 394
 395         TraversingVisitor::visit(call);
 396 }
 397
 398 void FunctionResolver::visit(FunctionDeclaration &func)
 399 {
 400         FunctionDeclaration *&stage_decl = stage->functions[func.name];
 401         vector<FunctionDeclaration *> &decls = declarations[func.name];
 402         if(func.definition==&func)
 403         {
 404                 stage_decl = &func;
 405
 406                 // Set all previous declarations to use this definition.
 407                 for(vector<FunctionDeclaration *>::iterator i=decls.begin(); i!=decls.end(); ++i)
 408                 {
 409                         (*i)->definition = func.definition;
 410                         (*i)->body.body.clear();
 411                 }
 412         }
 413         else
 414         {
 415                 func.definition = 0;
 416                 if(!stage_decl)
 417                         stage_decl = &func;
 418                 else
 419                         func.definition = stage_decl->definition;
 420         }
 421         decls.push_back(&func);
 422
 423         TraversingVisitor::visit(func);
 424 }
 425
 426
 427 InterfaceGenerator::InterfaceGenerator():
 428         stage(0),
 429         function_scope(false),
 430         iface_block(0),
 431         copy_block(false),
 432         iface_target_block(0)
 433 { }
 434
 435 string InterfaceGenerator::get_out_prefix(Stage::Type type)
 436 {
 437         if(type==Stage::VERTEX)
 438                 return "_vs_out_";
 439         else if(type==Stage::GEOMETRY)
 440                 return "_gs_out_";
 441         else
 442                 return string();
 443 }
 444
 445 void InterfaceGenerator::apply(Stage &s)
 446 {
 447         stage = &s;
 448         iface_target_block = &stage->content;
 449         if(stage->previous)
 450                 in_prefix = get_out_prefix(stage->previous->type);
 451         out_prefix = get_out_prefix(stage->type);
 452         s.content.visit(*this);
 453         NodeRemover().apply(s, nodes_to_remove);
 454 }
 455
 456 void InterfaceGenerator::visit(Block &block)
 457 {
 458         SetForScope<Block *> set_block(current_block, &block);
 459         for(NodeList<Statement>::iterator i=block.body.begin(); i!=block.body.end(); ++i)
 460         {
 461                 assignment_insert_point = i;
 462                 if(&block==&stage->content)
 463                         iface_insert_point = i;
 464
 465                 (*i)->visit(*this);
 466         }
 467 }
 468
 469 string InterfaceGenerator::change_prefix(const string &name, const string &prefix) const
 470 {
 471         unsigned offset = (name.compare(0, in_prefix.size(), in_prefix) ? 0 : in_prefix.size());
 472         return prefix+name.substr(offset);
 473 }
 474
 475 VariableDeclaration *InterfaceGenerator::generate_interface(VariableDeclaration &var, const string &iface, const string &name)
 476 {
 477         if(stage->content.variables.count(name))
 478                 return 0;
 479
 480         VariableDeclaration* iface_var = new VariableDeclaration;
 481         iface_var->sampling = var.sampling;
 482         iface_var->interface = iface;
 483         iface_var->type = var.type;
 484         iface_var->name = name;
 485         /* Geometry shader inputs are always arrays.  But if we're bringing in an
 486         entire block, the array is on the block and not individual variables. */
 487         if(stage->type==Stage::GEOMETRY && !copy_block)
 488                 iface_var->array = ((var.array && var.interface!="in") || iface=="in");
 489         else
 490                 iface_var->array = var.array;
 491         if(iface_var->array)
 492                 iface_var->array_size = var.array_size;
 493         if(iface=="in")
 494         {
 495                 iface_var->layout = var.layout;
 496                 iface_var->linked_declaration = &var;
 497                 var.linked_declaration = iface_var;
 498         }
 499
 500         iface_target_block->body.insert(iface_insert_point, iface_var);
 501         iface_target_block->variables.insert(make_pair(name, iface_var));
 502
 503         return iface_var;
 504 }
 505
 506 InterfaceBlock *InterfaceGenerator::generate_interface(InterfaceBlock &out_block)
 507 {
 508         if(stage->interface_blocks.count("in"+out_block.name))
 509                 return 0;
 510
 511         InterfaceBlock *in_block = new InterfaceBlock;
 512         in_block->interface = "in";
 513         in_block->name = out_block.name;
 514         in_block->instance_name = out_block.instance_name;
 515         if(stage->type==Stage::GEOMETRY)
 516                 in_block->array = true;
 517         else
 518                 in_block->array = out_block.array;
 519         in_block->linked_block = &out_block;
 520         out_block.linked_block = in_block;
 521
 522         {
 523                 SetFlag set_copy(copy_block, true);
 524                 SetForScope<Block *> set_target(iface_target_block, &in_block->members);
 525                 SetForScope<NodeList<Statement>::iterator> set_ins_pt(iface_insert_point, in_block->members.body.end());
 526                 out_block.members.visit(*this);
 527         }
 528
 529         iface_target_block->body.insert(iface_insert_point, in_block);
 530         stage->interface_blocks.insert(make_pair("in"+in_block->name, in_block));
 531         if(!in_block->instance_name.empty())
 532                 stage->interface_blocks.insert(make_pair("_"+in_block->instance_name, in_block));
 533
 534         SetFlag set_scope(function_scope, false);
 535         SetForScope<Block *> set_block(current_block, &stage->content);
 536         in_block->visit(*this);
 537
 538         return in_block;
 539 }
 540
 541 ExpressionStatement &InterfaceGenerator::insert_assignment(const string &left, Expression *right)
 542 {
 543         Assignment *assign = new Assignment;
 544         VariableReference *ref = new VariableReference;
 545         ref->name = left;
 546         assign->left = ref;
 547         assign->oper = &Operator::get_operator("=", Operator::BINARY);
 548         assign->right = right;
 549
 550         ExpressionStatement *stmt = new ExpressionStatement;
 551         stmt->expression = assign;
 552         current_block->body.insert(assignment_insert_point, stmt);
 553         stmt->visit(*this);
 554
 555         return *stmt;
 556 }
 557
 558 void InterfaceGenerator::visit(VariableReference &var)
 559 {
 560         if(var.declaration || !stage->previous)
 561                 return;
 562         /* Don't pull a variable from previous stage if we just generated an output
 563         interface in this stage */
 564         if(stage->content.variables.count(var.name))
 565                 return;
 566
 567         const map<string, VariableDeclaration *> &prev_vars = stage->previous->content.variables;
 568         map<string, VariableDeclaration *>::const_iterator i = prev_vars.find(var.name);
 569         if(i==prev_vars.end() || i->second->interface!="out")
 570                 i = prev_vars.find(in_prefix+var.name);
 571         if(i!=prev_vars.end() && i->second->interface=="out")
 572         {
 573                 generate_interface(*i->second, "in", i->second->name);
 574                 var.name = i->second->name;
 575                 return;
 576         }
 577
 578         const map<string, InterfaceBlock *> &prev_blocks = stage->previous->interface_blocks;
 579         map<string, InterfaceBlock *>::const_iterator j = prev_blocks.find("_"+var.name);
 580         if(j!=prev_blocks.end() && j->second->interface=="out")
 581         {
 582                 generate_interface(*j->second);
 583                 /* Let VariableResolver convert the variable reference into an interface
 584                 block reference. */
 585                 return;
 586         }
 587
 588         for(j=prev_blocks.begin(); j!=prev_blocks.end(); ++j)
 589                 if(j->second->instance_name.empty())
 590                 {
 591                         i = j->second->members.variables.find(var.name);
 592                         if(i!=j->second->members.variables.end())
 593                         {
 594                                 generate_interface(*j->second);
 595                                 return;
 596                         }
 597                 }
 598 }
 599
 600 void InterfaceGenerator::visit(VariableDeclaration &var)
 601 {
 602         if(copy_block)
 603         {
 604                 generate_interface(var, "in", var.name);
 605                 return;
 606         }
 607
 608         if(iface_block)
 609         {
 610                 if(iface_block->linked_block)
 611                 {
 612                         // Link all variables to their counterparts in the linked block.
 613                         const map<string, VariableDeclaration *> &linked_vars = iface_block->linked_block->members.variables;
 614                         map<string, VariableDeclaration *>::const_iterator i = linked_vars.find(var.name);
 615                         if(i!=linked_vars.end())
 616                         {
 617                                 var.linked_declaration = i->second;
 618                                 var.linked_declaration->linked_declaration = &var;
 619                         }
 620                 }
 621                 return;
 622         }
 623
 624         if(var.interface=="out")
 625         {
 626                 /* For output variables in function scope, generate a global interface
 627                 and replace the local declaration with an assignment. */
 628                 VariableDeclaration *out_var = 0;
 629                 if(function_scope && (out_var=generate_interface(var, "out", var.name)))
 630                 {
 631                         out_var->source = var.source;
 632                         out_var->line = var.line;
 633                         nodes_to_remove.insert(&var);
 634                         if(var.init_expression)
 635                         {
 636                                 ExpressionStatement &stmt = insert_assignment(var.name, var.init_expression->clone());
 637                                 stmt.source = var.source;
 638                                 stmt.line = var.line;
 639                                 return;
 640                         }
 641                 }
 642         }
 643         else if(var.interface=="in")
 644         {
 645                 /* Try to link input variables in global scope with output variables from
 646                 previous stage. */
 647                 if(current_block==&stage->content && !var.linked_declaration && stage->previous)
 648                 {
 649                         const map<string, VariableDeclaration *> &prev_vars = stage->previous->content.variables;
 650                         map<string, VariableDeclaration *>::const_iterator i = prev_vars.find(var.name);
 651                         if(i!=prev_vars.end() && i->second->interface=="out")
 652                         {
 653                                 var.linked_declaration = i->second;
 654                                 i->second->linked_declaration = &var;
 655                         }
 656                 }
 657         }
 658
 659         TraversingVisitor::visit(var);
 660 }
 661
 662 void InterfaceGenerator::visit(InterfaceBlock &iface)
 663 {
 664         if(iface.interface=="in")
 665         {
 666                 /* Try to link input blocks with output blocks sharing the same block
 667                 name from previous stage. */
 668                 if(!iface.linked_block && stage->previous)
 669                 {
 670                         const map<string, InterfaceBlock *> &prev_blocks = stage->previous->interface_blocks;
 671                         map<string, InterfaceBlock *>::const_iterator i = prev_blocks.find("out"+iface.name);
 672                         if(i!=prev_blocks.end())
 673                         {
 674                                 iface.linked_block = i->second;
 675                                 i->second->linked_block = &iface;
 676                         }
 677                 }
 678         }
 679
 680         SetForScope<InterfaceBlock *> set_iface(iface_block, &iface);
 681         TraversingVisitor::visit(iface);
 682 }
 683
 684 void InterfaceGenerator::visit(FunctionDeclaration &func)
 685 {
 686         SetFlag set_scope(function_scope, true);
 687         // Skip parameters because they're not useful here
 688         func.body.visit(*this);
 689 }
 690
 691 void InterfaceGenerator::visit(Passthrough &pass)
 692 {
 693         vector<VariableDeclaration *> pass_vars;
 694
 695         // Pass through all input variables of this stage.
 696         for(map<string, VariableDeclaration *>::const_iterator i=stage->content.variables.begin(); i!=stage->content.variables.end(); ++i)
 697                 if(i->second->interface=="in")
 698                         pass_vars.push_back(i->second);
 699
 700         if(stage->previous)
 701         {
 702                 const map<string, VariableDeclaration *> &prev_vars = stage->previous->content.variables;
 703                 for(map<string, VariableDeclaration *>::const_iterator i=prev_vars.begin(); i!=prev_vars.end(); ++i)
 704                 {
 705                         if(i->second->interface!="out")
 706                                 continue;
 707
 708                         /* Pass through output variables from the previous stage, but only
 709                         those which are not already linked to an input here. */
 710                         if(!i->second->linked_declaration && generate_interface(*i->second, "in", i->second->name))
 711                                 pass_vars.push_back(i->second);
 712                 }
 713         }
 714
 715         if(stage->type==Stage::GEOMETRY)
 716         {
 717                 /* Special case for geometry shader: copy gl_Position from input to
 718                 output. */
 719                 InterfaceBlockReference *ref = new InterfaceBlockReference;
 720                 ref->name = "gl_in";
 721
 722                 BinaryExpression *subscript = new BinaryExpression;
 723                 subscript->left = ref;
 724                 subscript->oper = &Operator::get_operator("[", Operator::BINARY);
 725                 subscript->right = pass.subscript;
 726
 727                 MemberAccess *memacc = new MemberAccess;
 728                 memacc->left = subscript;
 729                 memacc->member = "gl_Position";
 730
 731                 insert_assignment("gl_Position", memacc);
 732         }
 733
 734         for(vector<VariableDeclaration *>::const_iterator i=pass_vars.begin(); i!=pass_vars.end(); ++i)
 735         {
 736                 string out_name = change_prefix((*i)->name, out_prefix);
 737                 generate_interface(**i, "out", out_name);
 738
 739                 VariableReference *ref = new VariableReference;
 740                 ref->name = (*i)->name;
 741                 if(pass.subscript)
 742                 {
 743                         BinaryExpression *subscript = new BinaryExpression;
 744                         subscript->left = ref;
 745                         subscript->oper = &Operator::get_operator("[", Operator::BINARY);
 746                         subscript->right = pass.subscript;
 747                         insert_assignment(out_name, subscript);
 748                 }
 749                 else
 750                         insert_assignment(out_name, ref);
 751         }
 752
 753         nodes_to_remove.insert(&pass);
 754 }
 755
 756 } // namespace SL
 757 } // namespace GL
 758 } // namespace Msp