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 VariableResolver::VariableResolver():
 118         stage(0),
 119         members(0),
 120         record_target(false),
 121         assignment_target(0),
 122         self_referencing(false)
 123 { }
 124
 125 void VariableResolver::apply(Stage &s)
 126 {
 127         stage = &s;
 128         s.types.clear();
 129         s.interface_blocks.clear();
 130         s.content.visit(*this);
 131 }
 132
 133 void VariableResolver::enter(Block &block)
 134 {
 135         block.variables.clear();
 136 }
 137
 138 void VariableResolver::visit(VariableReference &var)
 139 {
 140         var.declaration = 0;
 141         members = 0;
 142         for(Block *block=current_block; (!var.declaration && block); block=block->parent)
 143         {
 144                 map<string, VariableDeclaration *>::iterator i = block->variables.find(var.name);
 145                 if(i!=block->variables.end())
 146                         var.declaration = i->second;
 147         }
 148
 149         if(var.declaration)
 150         {
 151                 if(var.declaration->type_declaration)
 152                         members = &var.declaration->type_declaration->members.variables;
 153         }
 154         else
 155         {
 156                 const map<string, InterfaceBlock *> &blocks = stage->interface_blocks;
 157                 map<string, InterfaceBlock *>::const_iterator i = blocks.find(var.name);
 158                 if(i!=blocks.end() && i->second->instance_name==var.name)
 159                 {
 160                         iface_ref = new InterfaceBlockReference;
 161                         iface_ref->name = var.name;
 162                         iface_ref->declaration = i->second;
 163                         members = &i->second->members.variables;
 164                 }
 165                 else
 166                 {
 167                         for(i=blocks.begin(); (!var.declaration && i!=blocks.end()); ++i)
 168                                 if(i->second->instance_name.empty())
 169                                 {
 170                                         map<string, VariableDeclaration *>::iterator j = i->second->members.variables.find(var.name);
 171                                         if(j!=i->second->members.variables.end())
 172                                                 var.declaration = j->second;
 173                                 }
 174                 }
 175         }
 176
 177         if(record_target)
 178         {
 179                 if(assignment_target)
 180                 {
 181                         record_target = false;
 182                         assignment_target = 0;
 183                 }
 184                 else
 185                         assignment_target = var.declaration;
 186         }
 187         else if(var.declaration && var.declaration==assignment_target)
 188                 self_referencing = true;
 189 }
 190
 191 void VariableResolver::visit(InterfaceBlockReference &iface)
 192 {
 193         iface.declaration = 0;
 194         for(Block *block=current_block; block; block=block->parent)
 195         {
 196                 map<string, InterfaceBlock *>::iterator i = stage->interface_blocks.find(iface.name);
 197                 if(i!=stage->interface_blocks.end())
 198                 {
 199                         iface.declaration = i->second;
 200                         members = &i->second->members.variables;
 201                         break;
 202                 }
 203         }
 204 }
 205
 206 void VariableResolver::visit(MemberAccess &memacc)
 207 {
 208         members = 0;
 209         iface_ref = 0;
 210         memacc.left->visit(*this);
 211
 212         if(iface_ref)
 213                 memacc.left = iface_ref;
 214         iface_ref = 0;
 215
 216         memacc.declaration = 0;
 217         if(members)
 218         {
 219                 map<string, VariableDeclaration *>::iterator i = members->find(memacc.member);
 220                 if(i!=members->end())
 221                 {
 222                         memacc.declaration = i->second;
 223                         if(i->second->type_declaration)
 224                                 members = &i->second->type_declaration->members.variables;
 225                 }
 226                 else
 227                         members = 0;
 228         }
 229 }
 230
 231 void VariableResolver::visit(BinaryExpression &binary)
 232 {
 233         if(binary.oper=="[")
 234         {
 235                 {
 236                         SetForScope<bool> set(record_target, false);
 237                         binary.right->visit(*this);
 238                 }
 239                 members = 0;
 240                 iface_ref = 0;
 241                 binary.left->visit(*this);
 242                 if(iface_ref)
 243                         binary.left = iface_ref;
 244                 iface_ref = 0;
 245         }
 246         else
 247         {
 248                 TraversingVisitor::visit(binary);
 249                 members = 0;
 250         }
 251 }
 252
 253 void VariableResolver::visit(Assignment &assign)
 254 {
 255         {
 256                 SetFlag set(record_target);
 257                 assignment_target = 0;
 258                 assign.left->visit(*this);
 259         }
 260
 261         self_referencing = false;
 262         assign.right->visit(*this);
 263
 264         assign.self_referencing = (self_referencing || assign.oper!="=");
 265         assign.target_declaration = assignment_target;
 266 }
 267
 268 void VariableResolver::visit(StructDeclaration &strct)
 269 {
 270         TraversingVisitor::visit(strct);
 271         stage->types[strct.name] = &strct;
 272 }
 273
 274 void VariableResolver::visit(VariableDeclaration &var)
 275 {
 276         map<string, StructDeclaration *>::iterator i = stage->types.find(var.type);
 277         if(i!=stage->types.end())
 278                 var.type_declaration = i->second;
 279
 280         if(!block_interface.empty() && var.interface.empty())
 281                 var.interface = block_interface;
 282
 283         TraversingVisitor::visit(var);
 284         current_block->variables[var.name] = &var;
 285 }
 286
 287 void VariableResolver::visit(InterfaceBlock &iface)
 288 {
 289         /* Block names can't be used for any other identifiers so we can put them
 290         in the same map with instance names. */
 291         stage->interface_blocks[iface.name] = &iface;
 292         if(!iface.instance_name.empty())
 293                 stage->interface_blocks[iface.instance_name] = &iface;
 294
 295         SetForScope<string> set_iface(block_interface, iface.interface);
 296         TraversingVisitor::visit(iface);
 297 }
 298
 299
 300 void FunctionResolver::apply(Stage &s)
 301 {
 302         stage = &s;
 303         s.functions.clear();
 304         s.content.visit(*this);
 305 }
 306
 307 void FunctionResolver::visit(FunctionCall &call)
 308 {
 309         map<string, FunctionDeclaration *>::iterator i = stage->functions.find(call.name);
 310         if(i!=stage->functions.end())
 311                 call.declaration = i->second;
 312
 313         TraversingVisitor::visit(call);
 314 }
 315
 316 void FunctionResolver::visit(FunctionDeclaration &func)
 317 {
 318         FunctionDeclaration *&stage_decl = stage->functions[func.name];
 319         vector<FunctionDeclaration *> &decls = declarations[func.name];
 320         if(func.definition==&func)
 321         {
 322                 stage_decl = &func;
 323
 324                 for(vector<FunctionDeclaration *>::iterator i=decls.begin(); i!=decls.end(); ++i)
 325                 {
 326                         (*i)->definition = func.definition;
 327                         (*i)->body.body.clear();
 328                 }
 329         }
 330         else
 331         {
 332                 if(!stage_decl)
 333                         stage_decl = &func;
 334
 335                 func.definition = stage_decl->definition;
 336         }
 337         decls.push_back(&func);
 338
 339         TraversingVisitor::visit(func);
 340 }
 341
 342
 343 InterfaceGenerator::InterfaceGenerator():
 344         stage(0),
 345         function_scope(false),
 346         iface_block(0),
 347         copy_block(false),
 348         iface_target_block(0)
 349 { }
 350
 351 string InterfaceGenerator::get_out_prefix(Stage::Type type)
 352 {
 353         if(type==Stage::VERTEX)
 354                 return "_vs_out_";
 355         else if(type==Stage::GEOMETRY)
 356                 return "_gs_out_";
 357         else
 358                 return string();
 359 }
 360
 361 void InterfaceGenerator::apply(Stage &s)
 362 {
 363         stage = &s;
 364         iface_target_block = &stage->content;
 365         if(stage->previous)
 366                 in_prefix = get_out_prefix(stage->previous->type);
 367         out_prefix = get_out_prefix(stage->type);
 368         s.content.visit(*this);
 369         NodeRemover().apply(s, nodes_to_remove);
 370 }
 371
 372 void InterfaceGenerator::visit(Block &block)
 373 {
 374         SetForScope<Block *> set_block(current_block, &block);
 375         for(NodeList<Statement>::iterator i=block.body.begin(); i!=block.body.end(); ++i)
 376         {
 377                 assignment_insert_point = i;
 378                 if(&block==&stage->content)
 379                         iface_insert_point = i;
 380
 381                 (*i)->visit(*this);
 382         }
 383 }
 384
 385 string InterfaceGenerator::change_prefix(const string &name, const string &prefix) const
 386 {
 387         unsigned offset = (name.compare(0, in_prefix.size(), in_prefix) ? 0 : in_prefix.size());
 388         return prefix+name.substr(offset);
 389 }
 390
 391 bool InterfaceGenerator::generate_interface(VariableDeclaration &var, const string &iface, const string &name)
 392 {
 393         if(stage->content.variables.count(name))
 394                 return false;
 395
 396         VariableDeclaration* iface_var = new VariableDeclaration;
 397         iface_var->sampling = var.sampling;
 398         iface_var->interface = iface;
 399         iface_var->type = var.type;
 400         iface_var->type_declaration = var.type_declaration;
 401         iface_var->name = name;
 402         if(stage->type==Stage::GEOMETRY && !copy_block)
 403                 iface_var->array = ((var.array && var.interface!="in") || iface=="in");
 404         else
 405                 iface_var->array = var.array;
 406         if(iface_var->array)
 407                 iface_var->array_size = var.array_size;
 408         if(iface=="in")
 409         {
 410                 iface_var->layout = var.layout;
 411                 iface_var->linked_declaration = &var;
 412                 var.linked_declaration = iface_var;
 413         }
 414
 415         iface_target_block->body.insert(iface_insert_point, iface_var);
 416         iface_target_block->variables[name] = iface_var;
 417
 418         return true;
 419 }
 420
 421 bool InterfaceGenerator::generate_interface(InterfaceBlock &out_block)
 422 {
 423         if(stage->interface_blocks.count(out_block.name))
 424                 return false;
 425
 426         InterfaceBlock *in_block = new InterfaceBlock;
 427         in_block->interface = "in";
 428         in_block->name = out_block.name;
 429         in_block->instance_name = out_block.instance_name;
 430         if(stage->type==Stage::GEOMETRY)
 431                 in_block->array = true;
 432         else
 433                 in_block->array = out_block.array;
 434         in_block->linked_block = &out_block;
 435         out_block.linked_block = in_block;
 436
 437         {
 438                 SetFlag set_copy(copy_block, true);
 439                 SetForScope<Block *> set_target(iface_target_block, &in_block->members);
 440                 SetForScope<NodeList<Statement>::iterator> set_ins_pt(iface_insert_point, in_block->members.body.end());
 441                 out_block.members.visit(*this);
 442         }
 443
 444         iface_target_block->body.insert(iface_insert_point, in_block);
 445         stage->interface_blocks[in_block->name] = in_block;
 446         if(!in_block->instance_name.empty())
 447                 stage->interface_blocks[in_block->instance_name] = in_block;
 448
 449         SetFlag set_scope(function_scope, false);
 450         SetForScope<Block *> set_block(current_block, &stage->content);
 451         in_block->visit(*this);
 452
 453         return true;
 454 }
 455
 456 ExpressionStatement &InterfaceGenerator::insert_assignment(const string &left, Expression *right)
 457 {
 458         Assignment *assign = new Assignment;
 459         VariableReference *ref = new VariableReference;
 460         ref->name = left;
 461         assign->left = ref;
 462         assign->oper = "=";
 463         assign->right = right;
 464
 465         ExpressionStatement *stmt = new ExpressionStatement;
 466         stmt->expression = assign;
 467         current_block->body.insert(assignment_insert_point, stmt);
 468         stmt->visit(*this);
 469
 470         return *stmt;
 471 }
 472
 473 void InterfaceGenerator::visit(VariableReference &var)
 474 {
 475         if(var.declaration || !stage->previous)
 476                 return;
 477         /* Don't pull a variable from previous stage if we just generated an out
 478         interface in this stage */
 479         if(stage->content.variables.count(var.name))
 480                 return;
 481
 482         const map<string, VariableDeclaration *> &prev_vars = stage->previous->content.variables;
 483         map<string, VariableDeclaration *>::const_iterator i = prev_vars.find(var.name);
 484         if(i==prev_vars.end() || i->second->interface!="out")
 485                 i = prev_vars.find(in_prefix+var.name);
 486         if(i!=prev_vars.end() && i->second->interface=="out")
 487         {
 488                 generate_interface(*i->second, "in", i->second->name);
 489                 var.name = i->second->name;
 490                 return;
 491         }
 492
 493         const map<string, InterfaceBlock *> &prev_blocks = stage->previous->interface_blocks;
 494         map<string, InterfaceBlock *>::const_iterator j = prev_blocks.find(var.name);
 495         if(j!=prev_blocks.end() && j->second->interface=="out" && j->second->instance_name==var.name)
 496         {
 497                 generate_interface(*j->second);
 498                 return;
 499         }
 500
 501         for(j=prev_blocks.begin(); j!=prev_blocks.end(); ++j)
 502                 if(j->second->instance_name.empty())
 503                 {
 504                         i = j->second->members.variables.find(var.name);
 505                         if(i!=j->second->members.variables.end())
 506                         {
 507                                 generate_interface(*j->second);
 508                                 return;
 509                         }
 510                 }
 511 }
 512
 513 void InterfaceGenerator::visit(VariableDeclaration &var)
 514 {
 515         if(copy_block)
 516         {
 517                 generate_interface(var, "in", var.name);
 518                 return;
 519         }
 520
 521         if(iface_block)
 522         {
 523                 if(iface_block->linked_block)
 524                 {
 525                         const map<string, VariableDeclaration *> &linked_vars = iface_block->linked_block->members.variables;
 526                         map<string, VariableDeclaration *>::const_iterator i = linked_vars.find(var.name);
 527                         if(i!=linked_vars.end())
 528                                 var.linked_declaration = i->second;
 529                 }
 530                 return;
 531         }
 532
 533         if(var.interface=="out")
 534         {
 535                 /* For out variables in function scope, generate a global interface and
 536                 replace the local declaration with an assignment. */
 537                 if(function_scope && generate_interface(var, "out", var.name))
 538                 {
 539                         nodes_to_remove.insert(&var);
 540                         if(var.init_expression)
 541                         {
 542                                 ExpressionStatement &stmt = insert_assignment(var.name, var.init_expression->clone());
 543                                 stmt.source = var.source;
 544                                 stmt.line = var.line;
 545                                 return;
 546                         }
 547                 }
 548         }
 549         else if(var.interface=="in")
 550         {
 551                 /* Try to link in variables in global scope with out variables from
 552                 previous stage */
 553                 if(current_block==&stage->content && !var.linked_declaration && stage->previous)
 554                 {
 555                         const map<string, VariableDeclaration *> &prev_vars = stage->previous->content.variables;
 556                         map<string, VariableDeclaration *>::const_iterator i = prev_vars.find(var.name);
 557                         if(i!=prev_vars.end() && i->second->interface=="out")
 558                         {
 559                                 var.linked_declaration = i->second;
 560                                 i->second->linked_declaration = &var;
 561                         }
 562                 }
 563         }
 564
 565         TraversingVisitor::visit(var);
 566 }
 567
 568 void InterfaceGenerator::visit(InterfaceBlock &iface)
 569 {
 570         if(iface.interface=="in")
 571         {
 572                 if(!iface.linked_block && stage->previous)
 573                 {
 574                         const map<string, InterfaceBlock *> &prev_blocks = stage->previous->interface_blocks;
 575                         map<string, InterfaceBlock *>::const_iterator i = prev_blocks.find(iface.name);
 576                         if(i!=prev_blocks.end() && i->second->interface=="out" && i->second->name==iface.name)
 577                         {
 578                                 iface.linked_block = i->second;
 579                                 i->second->linked_block = &iface;
 580                         }
 581                 }
 582         }
 583
 584         SetForScope<InterfaceBlock *> set_iface(iface_block, &iface);
 585         TraversingVisitor::visit(iface);
 586 }
 587
 588 void InterfaceGenerator::visit(FunctionDeclaration &func)
 589 {
 590         SetFlag set_scope(function_scope, true);
 591         // Skip parameters because they're not useful here
 592         func.body.visit(*this);
 593 }
 594
 595 void InterfaceGenerator::visit(Passthrough &pass)
 596 {
 597         vector<VariableDeclaration *> pass_vars;
 598
 599         for(map<string, VariableDeclaration *>::const_iterator i=stage->content.variables.begin(); i!=stage->content.variables.end(); ++i)
 600                 if(i->second->interface=="in")
 601                         pass_vars.push_back(i->second);
 602
 603         if(stage->previous)
 604         {
 605                 const map<string, VariableDeclaration *> &prev_vars = stage->previous->content.variables;
 606                 for(map<string, VariableDeclaration *>::const_iterator i=prev_vars.begin(); i!=prev_vars.end(); ++i)
 607                 {
 608                         bool linked = false;
 609                         for(vector<VariableDeclaration *>::const_iterator j=pass_vars.begin(); (!linked && j!=pass_vars.end()); ++j)
 610                                 linked = ((*j)->linked_declaration==i->second);
 611
 612                         if(!linked && generate_interface(*i->second, "in", i->second->name))
 613                                 pass_vars.push_back(i->second);
 614                 }
 615         }
 616
 617         if(stage->type==Stage::GEOMETRY)
 618         {
 619                 InterfaceBlockReference *ref = new InterfaceBlockReference;
 620                 ref->name = "gl_in";
 621
 622                 BinaryExpression *subscript = new BinaryExpression;
 623                 subscript->left = ref;
 624                 subscript->oper = "[";
 625                 subscript->right = pass.subscript;
 626                 subscript->after = "]";
 627
 628                 MemberAccess *memacc = new MemberAccess;
 629                 memacc->left = subscript;
 630                 memacc->member = "gl_Position";
 631
 632                 insert_assignment("gl_Position", memacc);
 633         }
 634
 635         for(vector<VariableDeclaration *>::const_iterator i=pass_vars.begin(); i!=pass_vars.end(); ++i)
 636         {
 637                 string out_name = change_prefix((*i)->name, out_prefix);
 638                 generate_interface(**i, "out", out_name);
 639
 640                 VariableReference *ref = new VariableReference;
 641                 ref->name = (*i)->name;
 642                 if(pass.subscript)
 643                 {
 644                         BinaryExpression *subscript = new BinaryExpression;
 645                         subscript->left = ref;
 646                         subscript->oper = "[";
 647                         subscript->right = pass.subscript;
 648                         subscript->after = "]";
 649                         insert_assignment(out_name, subscript);
 650                 }
 651                 else
 652                         insert_assignment(out_name, ref);
 653         }
 654
 655         nodes_to_remove.insert(&pass);
 656 }
 657
 658 } // namespace SL
 659 } // namespace GL
 660 } // namespace Msp