source/programcompiler.cpp

   1 #include <msp/core/raii.h>
   2 #include <msp/gl/extensions/ext_gpu_shader4.h>
   3 #include <msp/strings/format.h>
   4 #include <msp/strings/utils.h>
   5 #include "error.h"
   6 #include "program.h"
   7 #include "programcompiler.h"
   8 #include "resources.h"
   9 #include "shader.h"
  10
  11 #undef interface
  12
  13 using namespace std;
  14
  15 namespace {
  16
  17 const char builtins_src[] =
  18         "#pragma MSP stage(vertex)\n"
  19         "out gl_PerVertex {\n"
  20         "  vec4 gl_Position;\n"
  21         "  float gl_ClipDistance[];\n"
  22         "};\n"
  23         "#pragma MSP stage(geometry)\n"
  24         "in gl_PerVertex {\n"
  25         "  vec4 gl_Position;\n"
  26         "  float gl_ClipDistance[];\n"
  27         "} gl_in[];\n"
  28         "out gl_PerVertex {\n"
  29         "  vec4 gl_Position;\n"
  30         "  float gl_ClipDistance[];\n"
  31         "};\n";
  32
  33 }
  34
  35 namespace Msp {
  36 namespace GL {
  37
  38 using namespace ProgramSyntax;
  39
  40 ProgramCompiler::ProgramCompiler():
  41         resources(0),
  42         module(0)
  43 { }
  44
  45 ProgramCompiler::~ProgramCompiler()
  46 {
  47         delete module;
  48 }
  49
  50 void ProgramCompiler::compile(const string &source, const string &src_name)
  51 {
  52         resources = 0;
  53         delete module;
  54         module = new Module();
  55         ProgramParser parser;
  56         imported_names.insert(src_name);
  57         append_module(parser.parse(source, src_name));
  58         process();
  59 }
  60
  61 void ProgramCompiler::compile(IO::Base &io, Resources *res, const string &src_name)
  62 {
  63         resources = res;
  64         delete module;
  65         module = new Module();
  66         ProgramParser parser;
  67         imported_names.insert(src_name);
  68         append_module(parser.parse(io, src_name));
  69         process();
  70 }
  71
  72 void ProgramCompiler::compile(IO::Base &io, const string &src_name)
  73 {
  74         compile(io, 0, src_name);
  75 }
  76
  77 void ProgramCompiler::add_shaders(Program &program)
  78 {
  79         if(!module)
  80                 throw invalid_operation("ProgramCompiler::add_shaders");
  81
  82         for(list<Stage>::iterator i=module->stages.begin(); i!=module->stages.end(); ++i)
  83         {
  84                 if(i->type==VERTEX)
  85                 {
  86                         program.attach_shader_owned(new VertexShader(apply<Formatter>(*i)));
  87                         for(map<string, unsigned>::iterator j=i->locations.begin(); j!=i->locations.end(); ++j)
  88                                 program.bind_attribute(j->second, j->first);
  89                 }
  90                 else if(i->type==GEOMETRY)
  91                         program.attach_shader_owned(new GeometryShader(apply<Formatter>(*i)));
  92                 else if(i->type==FRAGMENT)
  93                 {
  94                         program.attach_shader_owned(new FragmentShader(apply<Formatter>(*i)));
  95                         if(EXT_gpu_shader4)
  96                         {
  97                                 for(map<string, unsigned>::iterator j=i->locations.begin(); j!=i->locations.end(); ++j)
  98                                         program.bind_fragment_data(j->second, j->first);
  99                         }
 100                 }
 101         }
 102 }
 103
 104 Module *ProgramCompiler::create_builtins_module()
 105 {
 106         ProgramParser parser;
 107         Module *module = new Module(parser.parse(builtins_src, "<builtin>"));
 108         for(list<Stage>::iterator i=module->stages.begin(); i!=module->stages.end(); ++i)
 109         {
 110                 VariableResolver resolver;
 111                 i->content.visit(resolver);
 112                 for(map<string, VariableDeclaration *>::iterator j=i->content.variables.begin(); j!=i->content.variables.end(); ++j)
 113                         j->second->linked_declaration = j->second;
 114         }
 115         return module;
 116 }
 117
 118 Module &ProgramCompiler::get_builtins_module()
 119 {
 120         static RefPtr<Module> builtins_module = create_builtins_module();
 121         return *builtins_module;
 122 }
 123
 124 Stage *ProgramCompiler::get_builtins(StageType type)
 125 {
 126         Module &module = get_builtins_module();
 127         for(list<Stage>::iterator i=module.stages.begin(); i!=module.stages.end(); ++i)
 128                 if(i->type==type)
 129                         return &*i;
 130         return 0;
 131 }
 132
 133 void ProgramCompiler::append_module(ProgramSyntax::Module &mod)
 134 {
 135         vector<Import *> imports = apply<NodeGatherer<Import> >(mod.shared);
 136         for(vector<Import *>::iterator i=imports.begin(); i!=imports.end(); ++i)
 137                 import((*i)->module);
 138         apply<NodeRemover>(mod.shared, set<Node *>(imports.begin(), imports.end()));
 139
 140         append_stage(mod.shared);
 141         for(list<Stage>::iterator i=mod.stages.begin(); i!=mod.stages.end(); ++i)
 142                 append_stage(*i);
 143 }
 144
 145 void ProgramCompiler::append_stage(Stage &stage)
 146 {
 147         Stage *target = 0;
 148         if(stage.type==SHARED)
 149                 target = &module->shared;
 150         else
 151         {
 152                 list<Stage>::iterator i;
 153                 for(i=module->stages.begin(); (i!=module->stages.end() && i->type<stage.type); ++i) ;
 154                 if(i==module->stages.end() || i->type>stage.type)
 155                 {
 156                         list<Stage>::iterator j = module->stages.insert(i, stage.type);
 157                         if(i!=module->stages.end())
 158                                 i->previous = &*j;
 159                         i = j;
 160                         if(i!=module->stages.begin())
 161                                 i->previous = &*--j;
 162                 }
 163
 164                 target = &*i;
 165         }
 166
 167         for(NodeList<Node>::iterator i=stage.content.body.begin(); i!=stage.content.body.end(); ++i)
 168                 target->content.body.push_back(*i);
 169         apply<DeclarationCombiner>(*target);
 170 }
 171
 172 void ProgramCompiler::process()
 173 {
 174         for(list<Stage>::iterator i=module->stages.begin(); i!=module->stages.end(); ++i)
 175                 generate(*i);
 176         for(list<Stage>::iterator i=module->stages.begin(); i!=module->stages.end(); )
 177         {
 178                 if(optimize(*i))
 179                         i = module->stages.begin();
 180                 else
 181                         ++i;
 182         }
 183         for(list<Stage>::iterator i=module->stages.begin(); i!=module->stages.end(); ++i)
 184                 finalize(*i);
 185 }
 186
 187 void ProgramCompiler::import(const string &name)
 188 {
 189         string fn = name+".glsl";
 190         if(imported_names.count(fn))
 191                 return;
 192         imported_names.insert(fn);
 193
 194         RefPtr<IO::Seekable> io = (resources ? resources->open_raw(fn) : Resources::get_builtins().open(fn));
 195         if(!io)
 196                 throw runtime_error(format("module %s not found", name));
 197         ProgramParser import_parser;
 198         append_module(import_parser.parse(*io, fn));
 199 }
 200
 201 void ProgramCompiler::generate(Stage &stage)
 202 {
 203         inject_block(stage.content, module->shared.content);
 204
 205         apply<DeclarationReorderer>(stage);
 206         apply<FunctionResolver>(stage);
 207         apply<VariableResolver>(stage);
 208         apply<InterfaceGenerator>(stage);
 209         apply<VariableResolver>(stage);
 210         apply<DeclarationReorderer>(stage);
 211         apply<FunctionResolver>(stage);
 212         apply<LegacyConverter>(stage);
 213 }
 214
 215 bool ProgramCompiler::optimize(Stage &stage)
 216 {
 217         apply<ConstantConditionEliminator>(stage);
 218
 219         set<FunctionDeclaration *> inlineable = apply<InlineableFunctionLocator>(stage);
 220         apply<FunctionInliner>(stage, inlineable);
 221
 222         set<Node *> unused = apply<UnusedVariableLocator>(stage);
 223         set<Node *> unused2 = apply<UnusedFunctionLocator>(stage);
 224         unused.insert(unused2.begin(), unused2.end());
 225         apply<NodeRemover>(stage, unused);
 226
 227         return !unused.empty();
 228 }
 229
 230 void ProgramCompiler::finalize(Stage &stage)
 231 {
 232         if(get_gl_api()==OPENGL_ES2)
 233                 apply<DefaultPrecisionGenerator>(stage);
 234         else
 235                 apply<PrecisionRemover>(stage);
 236 }
 237
 238 void ProgramCompiler::inject_block(Block &target, const Block &source)
 239 {
 240         list<RefPtr<Node> >::iterator insert_point = target.body.begin();
 241         for(list<RefPtr<Node> >::const_iterator i=source.body.begin(); i!=source.body.end(); ++i)
 242                 target.body.insert(insert_point, (*i)->clone());
 243 }
 244
 245 template<typename T>
 246 typename T::ResultType ProgramCompiler::apply(Stage &stage)
 247 {
 248         T visitor;
 249         visitor.apply(stage);
 250         return visitor.get_result();
 251 }
 252
 253 template<typename T, typename A>
 254 typename T::ResultType ProgramCompiler::apply(Stage &stage, const A &arg)
 255 {
 256         T visitor(arg);
 257         visitor.apply(stage);
 258         return visitor.get_result();
 259 }
 260
 261
 262 ProgramCompiler::Visitor::Visitor():
 263         stage(0)
 264 { }
 265
 266 void ProgramCompiler::Visitor::apply(Stage &s)
 267 {
 268         SetForScope<Stage *> set(stage, &s);
 269         stage->content.visit(*this);
 270 }
 271
 272
 273 ProgramCompiler::BlockModifier::BlockModifier():
 274         remove_node(false)
 275 { }
 276
 277 void ProgramCompiler::BlockModifier::flatten_block(Block &block)
 278 {
 279         insert_nodes.insert(insert_nodes.end(), block.body.begin(), block.body.end());
 280         remove_node = true;
 281 }
 282
 283 void ProgramCompiler::BlockModifier::apply_and_increment(Block &block, list<RefPtr<Node> >::iterator &i)
 284 {
 285         block.body.insert(i, insert_nodes.begin(), insert_nodes.end());
 286         insert_nodes.clear();
 287
 288         if(remove_node)
 289                 block.body.erase(i++);
 290         else
 291                 ++i;
 292         remove_node = false;
 293 }
 294
 295 void ProgramCompiler::BlockModifier::visit(Block &block)
 296 {
 297         for(list<RefPtr<Node> >::iterator i=block.body.begin(); i!=block.body.end(); )
 298         {
 299                 (*i)->visit(*this);
 300                 apply_and_increment(block, i);
 301         }
 302 }
 303
 304
 305 ProgramCompiler::Formatter::Formatter():
 306         indent(0),
 307         parameter_list(false),
 308         else_if(0)
 309 { }
 310
 311 void ProgramCompiler::Formatter::apply(ProgramSyntax::Stage &s)
 312 {
 313         GLApi api = get_gl_api();
 314         const Version &ver = s.required_version;
 315
 316         if(ver)
 317         {
 318                 formatted += format("#version %d%02d", ver.major, ver.minor);
 319                 if(api==OPENGL_ES2 && ver>=Version(3, 0))
 320                         formatted += " es";
 321                 formatted += '\n';
 322         }
 323
 324         Visitor::apply(s);
 325 }
 326
 327 void ProgramCompiler::Formatter::visit(Literal &literal)
 328 {
 329         formatted += literal.token;
 330 }
 331
 332 void ProgramCompiler::Formatter::visit(ParenthesizedExpression &parexpr)
 333 {
 334         formatted += '(';
 335         parexpr.expression->visit(*this);
 336         formatted += ')';
 337 }
 338
 339 void ProgramCompiler::Formatter::visit(VariableReference &var)
 340 {
 341         formatted += var.name;
 342 }
 343
 344 void ProgramCompiler::Formatter::visit(MemberAccess &memacc)
 345 {
 346         memacc.left->visit(*this);
 347         formatted += format(".%s", memacc.member);
 348 }
 349
 350 void ProgramCompiler::Formatter::visit(UnaryExpression &unary)
 351 {
 352         if(unary.prefix)
 353                 formatted += unary.oper;
 354         unary.expression->visit(*this);
 355         if(!unary.prefix)
 356                 formatted += unary.oper;
 357 }
 358
 359 void ProgramCompiler::Formatter::visit(BinaryExpression &binary)
 360 {
 361         binary.left->visit(*this);
 362         formatted += binary.oper;
 363         binary.right->visit(*this);
 364         formatted += binary.after;
 365 }
 366
 367 void ProgramCompiler::Formatter::visit(Assignment &assign)
 368 {
 369         assign.left->visit(*this);
 370         formatted += format(" %s ", assign.oper);
 371         assign.right->visit(*this);
 372 }
 373
 374 void ProgramCompiler::Formatter::visit(FunctionCall &call)
 375 {
 376         formatted += format("%s(", call.name);
 377         for(vector<RefPtr<Expression> >::iterator i=call.arguments.begin(); i!=call.arguments.end(); ++i)
 378         {
 379                 if(i!=call.arguments.begin())
 380                         formatted += ", ";
 381                 (*i)->visit(*this);
 382         }
 383         formatted += ')';
 384 }
 385
 386 void ProgramCompiler::Formatter::visit(ExpressionStatement &expr)
 387 {
 388         expr.expression->visit(*this);
 389         formatted += ';';
 390 }
 391
 392 void ProgramCompiler::Formatter::visit(Block &block)
 393 {
 394         if(else_if)
 395                 --else_if;
 396
 397         unsigned brace_indent = indent;
 398         bool use_braces = (block.use_braces || (indent && block.body.size()!=1));
 399         if(use_braces)
 400                 formatted += format("%s{\n", string(brace_indent*2, ' '));
 401
 402         SetForScope<unsigned> set(indent, indent+(indent>0 || use_braces));
 403         string spaces(indent*2, ' ');
 404         for(list<RefPtr<Node> >::iterator i=block.body.begin(); i!=block.body.end(); ++i)
 405         {
 406                 if(i!=block.body.begin())
 407                         formatted += '\n';
 408                 formatted += spaces;
 409                 (*i)->visit(*this);
 410                 else_if = 0;
 411         }
 412
 413         if(use_braces)
 414                 formatted += format("\n%s}", string(brace_indent*2, ' '));
 415 }
 416
 417 void ProgramCompiler::Formatter::visit(Import &import)
 418 {
 419         formatted += format("import %s;", import.module);
 420 }
 421
 422 void ProgramCompiler::Formatter::visit(Precision &prec)
 423 {
 424         formatted += format("precision %s %s;", prec.precision, prec.type);
 425 }
 426
 427 void ProgramCompiler::Formatter::visit(Layout &layout)
 428 {
 429         formatted += "layout(";
 430         for(vector<Layout::Qualifier>::const_iterator i=layout.qualifiers.begin(); i!=layout.qualifiers.end(); ++i)
 431         {
 432                 if(i!=layout.qualifiers.begin())
 433                         formatted += ", ";
 434                 formatted += i->identifier;
 435                 if(!i->value.empty())
 436                         formatted += format("=%s", i->value);
 437         }
 438         formatted += ')';
 439 }
 440
 441 void ProgramCompiler::Formatter::visit(InterfaceLayout &layout)
 442 {
 443         layout.layout.visit(*this);
 444         formatted += format(" %s;", layout.interface);
 445 }
 446
 447 void ProgramCompiler::Formatter::visit(StructDeclaration &strct)
 448 {
 449         formatted += format("struct %s\n", strct.name);
 450         strct.members.visit(*this);
 451         formatted += ';';
 452 }
 453
 454 void ProgramCompiler::Formatter::visit(VariableDeclaration &var)
 455 {
 456         if(var.layout)
 457         {
 458                 var.layout->visit(*this);
 459                 formatted += ' ';
 460         }
 461         if(var.constant)
 462                 formatted += "const ";
 463         if(!var.interpolation.empty())
 464                 formatted += format("%s ", var.interpolation);
 465         if(!var.sampling.empty())
 466                 formatted += format("%s ", var.sampling);
 467         if(!var.interface.empty() && var.interface!=block_interface)
 468         {
 469                 string interface = var.interface;
 470                 if(stage->required_version<Version(1, 30))
 471                 {
 472                         if(stage->type==VERTEX && var.interface=="in")
 473                                 interface = "attribute";
 474                         else if((stage->type==VERTEX && var.interface=="out") || (stage->type==FRAGMENT && var.interface=="in"))
 475                                 interface = "varying";
 476                 }
 477                 formatted += format("%s ", interface);
 478         }
 479         if(!var.precision.empty())
 480                 formatted += format("%s ", var.precision);
 481         formatted += format("%s %s", var.type, var.name);
 482         if(var.array)
 483         {
 484                 formatted += '[';
 485                 if(var.array_size)
 486                         var.array_size->visit(*this);
 487                 formatted += ']';
 488         }
 489         if(var.init_expression)
 490         {
 491                 formatted += " = ";
 492                 var.init_expression->visit(*this);
 493         }
 494         if(!parameter_list)
 495                 formatted += ';';
 496 }
 497
 498 void ProgramCompiler::Formatter::visit(InterfaceBlock &iface)
 499 {
 500         SetForScope<string> set(block_interface, iface.interface);
 501         formatted += format("%s %s\n", iface.interface, iface.name);
 502         iface.members.visit(*this);
 503         formatted += ';';
 504 }
 505
 506 void ProgramCompiler::Formatter::visit(FunctionDeclaration &func)
 507 {
 508         formatted += format("%s %s(", func.return_type, func.name);
 509         for(vector<RefPtr<VariableDeclaration> >::iterator i=func.parameters.begin(); i!=func.parameters.end(); ++i)
 510         {
 511                 if(i!=func.parameters.begin())
 512                         formatted += ", ";
 513                 SetFlag set(parameter_list);
 514                 (*i)->visit(*this);
 515         }
 516         formatted += ')';
 517         if(func.definition==&func)
 518         {
 519                 formatted += '\n';
 520                 func.body.visit(*this);
 521         }
 522         else
 523                 formatted += ';';
 524 }
 525
 526 void ProgramCompiler::Formatter::visit(Conditional &cond)
 527 {
 528         if(else_if)
 529                 formatted.replace(formatted.rfind('\n'), string::npos, 1, ' ');
 530
 531         indent -= else_if;
 532
 533         formatted += "if(";
 534         cond.condition->visit(*this);
 535         formatted += ")\n";
 536
 537         cond.body.visit(*this);
 538         if(!cond.else_body.body.empty())
 539         {
 540                 formatted += format("\n%selse\n", string(indent*2, ' '));
 541                 SetForScope<unsigned> set(else_if, 2);
 542                 cond.else_body.visit(*this);
 543         }
 544 }
 545
 546 void ProgramCompiler::Formatter::visit(Iteration &iter)
 547 {
 548         if(!iter.init_statement && iter.condition && !iter.loop_expression)
 549         {
 550                 formatted += "while(";
 551                 iter.condition->visit(*this);
 552                 formatted += ')';
 553         }
 554         else
 555         {
 556                 formatted += "for(";
 557                 if(iter.init_statement)
 558                         iter.init_statement->visit(*this);
 559                 else
 560                         formatted += ';';
 561                 if(iter.condition)
 562                 {
 563                         formatted += ' ';
 564                         iter.condition->visit(*this);
 565                 }
 566                 formatted += ';';
 567                 if(iter.loop_expression)
 568                 {
 569                         formatted += ' ';
 570                         iter.loop_expression->visit(*this);
 571                 }
 572                 formatted += ')';
 573         }
 574
 575         if(iter.body.body.empty())
 576                 formatted += " { }";
 577         else
 578         {
 579                 formatted += '\n';
 580                 iter.body.visit(*this);
 581         }
 582 }
 583
 584 void ProgramCompiler::Formatter::visit(Return &ret)
 585 {
 586         formatted += "return";
 587         if(ret.expression)
 588         {
 589                 formatted += ' ';
 590                 ret.expression->visit(*this);
 591         }
 592         formatted += ';';
 593 }
 594
 595 void ProgramCompiler::Formatter::visit(Jump &jump)
 596 {
 597         formatted += jump.keyword;
 598         formatted += ';';
 599 }
 600
 601
 602 ProgramCompiler::DeclarationCombiner::DeclarationCombiner():
 603         toplevel(true)
 604 { }
 605
 606 void ProgramCompiler::DeclarationCombiner::visit(Block &block)
 607 {
 608         if(!toplevel)
 609                 return;
 610
 611         SetForScope<bool> set(toplevel, false);
 612         BlockModifier::visit(block);
 613 }
 614
 615 void ProgramCompiler::DeclarationCombiner::visit(FunctionDeclaration &func)
 616 {
 617         vector<FunctionDeclaration *> &decls = functions[func.name];
 618         if(func.definition)
 619         {
 620                 for(vector<FunctionDeclaration *>::iterator i=decls.begin(); i!=decls.end(); ++i)
 621                 {
 622                         (*i)->definition = func.definition;
 623                         (*i)->body.body.clear();
 624                 }
 625         }
 626         decls.push_back(&func);
 627 }
 628
 629 void ProgramCompiler::DeclarationCombiner::visit(VariableDeclaration &var)
 630 {
 631         VariableDeclaration *&ptr = variables[var.name];
 632         if(ptr)
 633         {
 634                 ptr->type = var.type;
 635                 if(var.init_expression)
 636                         ptr->init_expression = var.init_expression;
 637                 remove_node = true;
 638         }
 639         else
 640                 ptr = &var;
 641 }
 642
 643
 644 ProgramCompiler::VariableResolver::VariableResolver():
 645         anonymous(false),
 646         record_target(false),
 647         assignment_target(0),
 648         self_referencing(false)
 649 { }
 650
 651 void ProgramCompiler::VariableResolver::apply(Stage &s)
 652 {
 653         SetForScope<Stage *> set(stage, &s);
 654         Stage *builtins = get_builtins(stage->type);
 655         if(builtins)
 656                 blocks.push_back(&builtins->content);
 657         stage->content.visit(*this);
 658         if(builtins)
 659                 blocks.pop_back();
 660 }
 661
 662 void ProgramCompiler::VariableResolver::visit(Block &block)
 663 {
 664         blocks.push_back(&block);
 665         block.variables.clear();
 666         TraversingVisitor::visit(block);
 667         blocks.pop_back();
 668 }
 669
 670 void ProgramCompiler::VariableResolver::visit(VariableReference &var)
 671 {
 672         var.declaration = 0;
 673         type = 0;
 674         for(vector<Block *>::iterator i=blocks.end(); i!=blocks.begin(); )
 675         {
 676                 --i;
 677                 map<string, VariableDeclaration *>::iterator j = (*i)->variables.find(var.name);
 678                 if(j!=(*i)->variables.end())
 679                 {
 680                         var.declaration = j->second;
 681                         type = j->second->type_declaration;
 682                         break;
 683                 }
 684         }
 685
 686         if(record_target)
 687         {
 688                 if(assignment_target)
 689                 {
 690                         record_target = false;
 691                         assignment_target = 0;
 692                 }
 693                 else
 694                         assignment_target = var.declaration;
 695         }
 696         else if(var.declaration && var.declaration==assignment_target)
 697                 self_referencing = true;
 698 }
 699
 700 void ProgramCompiler::VariableResolver::visit(MemberAccess &memacc)
 701 {
 702         type = 0;
 703         TraversingVisitor::visit(memacc);
 704         memacc.declaration = 0;
 705         if(type)
 706         {
 707                 map<string, VariableDeclaration *>::iterator i = type->members.variables.find(memacc.member);
 708                 if(i!=type->members.variables.end())
 709                 {
 710                         memacc.declaration = i->second;
 711                         type = i->second->type_declaration;
 712                 }
 713                 else
 714                         type = 0;
 715         }
 716 }
 717
 718 void ProgramCompiler::VariableResolver::visit(BinaryExpression &binary)
 719 {
 720         if(binary.oper=="[")
 721         {
 722                 {
 723                         SetForScope<bool> set(record_target, false);
 724                         binary.right->visit(*this);
 725                 }
 726                 type = 0;
 727                 binary.left->visit(*this);
 728         }
 729         else
 730         {
 731                 TraversingVisitor::visit(binary);
 732                 type = 0;
 733         }
 734 }
 735
 736 void ProgramCompiler::VariableResolver::visit(Assignment &assign)
 737 {
 738         {
 739                 SetFlag set(record_target);
 740                 assignment_target = 0;
 741                 assign.left->visit(*this);
 742         }
 743
 744         self_referencing = false;
 745         assign.right->visit(*this);
 746
 747         assign.self_referencing = (self_referencing || assign.oper!="=");
 748         assign.target_declaration = assignment_target;
 749 }
 750
 751 void ProgramCompiler::VariableResolver::visit(StructDeclaration &strct)
 752 {
 753         TraversingVisitor::visit(strct);
 754         blocks.back()->types[strct.name] = &strct;
 755 }
 756
 757 void ProgramCompiler::VariableResolver::visit(VariableDeclaration &var)
 758 {
 759         for(vector<Block *>::iterator i=blocks.end(); i!=blocks.begin(); )
 760         {
 761                 --i;
 762                 map<string, StructDeclaration *>::iterator j = (*i)->types.find(var.type);
 763                 if(j!=(*i)->types.end())
 764                         var.type_declaration = j->second;
 765         }
 766
 767         if(!block_interface.empty() && var.interface.empty())
 768                 var.interface = block_interface;
 769
 770         TraversingVisitor::visit(var);
 771         blocks.back()->variables[var.name] = &var;
 772         if(anonymous && blocks.size()>1)
 773                 blocks[blocks.size()-2]->variables[var.name] = &var;
 774 }
 775
 776 void ProgramCompiler::VariableResolver::visit(InterfaceBlock &iface)
 777 {
 778         SetFlag set(anonymous);
 779         SetForScope<string> set2(block_interface, iface.interface);
 780         TraversingVisitor::visit(iface);
 781 }
 782
 783
 784 void ProgramCompiler::FunctionResolver::visit(FunctionCall &call)
 785 {
 786         map<string, vector<FunctionDeclaration *> >::iterator i = functions.find(call.name);
 787         if(i!=functions.end())
 788                 call.declaration = i->second.back();
 789
 790         TraversingVisitor::visit(call);
 791 }
 792
 793 void ProgramCompiler::FunctionResolver::visit(FunctionDeclaration &func)
 794 {
 795         vector<FunctionDeclaration *> &decls = functions[func.name];
 796         if(func.definition)
 797         {
 798                 for(vector<FunctionDeclaration *>::iterator i=decls.begin(); i!=decls.end(); ++i)
 799                         (*i)->definition = func.definition;
 800                 decls.clear();
 801                 decls.push_back(&func);
 802         }
 803         else if(!decls.empty() && decls.back()->definition)
 804                 func.definition = decls.back()->definition;
 805         else
 806                 decls.push_back(&func);
 807
 808         TraversingVisitor::visit(func);
 809 }
 810
 811
 812 ProgramCompiler::InterfaceGenerator::InterfaceGenerator():
 813         scope_level(0)
 814 { }
 815
 816 string ProgramCompiler::InterfaceGenerator::get_out_prefix(StageType type)
 817 {
 818         if(type==VERTEX)
 819                 return "_vs_out_";
 820         else if(type==GEOMETRY)
 821                 return "_gs_out_";
 822         else
 823                 return string();
 824 }
 825
 826 void ProgramCompiler::InterfaceGenerator::apply(Stage &s)
 827 {
 828         SetForScope<Stage *> set(stage, &s);
 829         if(stage->previous)
 830                 in_prefix = get_out_prefix(stage->previous->type);
 831         out_prefix = get_out_prefix(stage->type);
 832         stage->content.visit(*this);
 833 }
 834
 835 void ProgramCompiler::InterfaceGenerator::visit(Block &block)
 836 {
 837         SetForScope<unsigned> set(scope_level, scope_level+1);
 838         for(list<RefPtr<Node> >::iterator i=block.body.begin(); i!=block.body.end(); )
 839         {
 840                 (*i)->visit(*this);
 841
 842                 if(scope_level==1)
 843                 {
 844                         for(map<string, RefPtr<VariableDeclaration> >::iterator j=iface_declarations.begin(); j!=iface_declarations.end(); ++j)
 845                         {
 846                                 list<RefPtr<Node> >::iterator k = block.body.insert(i, j->second);
 847                                 (*k)->visit(*this);
 848                         }
 849                         iface_declarations.clear();
 850                 }
 851
 852                 apply_and_increment(block, i);
 853         }
 854 }
 855
 856 string ProgramCompiler::InterfaceGenerator::change_prefix(const string &name, const string &prefix) const
 857 {
 858         unsigned offset = (name.compare(0, in_prefix.size(), in_prefix) ? 0 : in_prefix.size());
 859         return prefix+name.substr(offset);
 860 }
 861
 862 bool ProgramCompiler::InterfaceGenerator::generate_interface(VariableDeclaration &var, const string &iface, const string &name)
 863 {
 864         const map<string, VariableDeclaration *> &stage_vars = (iface=="in" ? stage->in_variables : stage->out_variables);
 865         if(stage_vars.count(name) || iface_declarations.count(name))
 866                 return false;
 867
 868         VariableDeclaration* iface_var = new VariableDeclaration;
 869         iface_var->sampling = var.sampling;
 870         iface_var->interface = iface;
 871         iface_var->type = var.type;
 872         iface_var->type_declaration = var.type_declaration;
 873         iface_var->name = name;
 874         if(stage->type==GEOMETRY)
 875                 iface_var->array = ((var.array && var.interface!="in") || iface=="in");
 876         else
 877                 iface_var->array = var.array;
 878         if(iface_var->array)
 879                 iface_var->array_size = var.array_size;
 880         if(iface=="in")
 881                 iface_var->linked_declaration = &var;
 882         iface_declarations[name] = iface_var;
 883
 884         return true;
 885 }
 886
 887 void ProgramCompiler::InterfaceGenerator::insert_assignment(const string &left, ProgramSyntax::Expression *right)
 888 {
 889         Assignment *assign = new Assignment;
 890         VariableReference *ref = new VariableReference;
 891         ref->name = left;
 892         assign->left = ref;
 893         assign->oper = "=";
 894         assign->right = right;
 895
 896         ExpressionStatement *stmt = new ExpressionStatement;
 897         stmt->expression = assign;
 898         stmt->visit(*this);
 899         insert_nodes.push_back(stmt);
 900 }
 901
 902 void ProgramCompiler::InterfaceGenerator::visit(VariableReference &var)
 903 {
 904         if(var.declaration || !stage->previous)
 905                 return;
 906         if(iface_declarations.count(var.name))
 907                 return;
 908
 909         const map<string, VariableDeclaration *> &prev_out = stage->previous->out_variables;
 910         map<string, VariableDeclaration *>::const_iterator i = prev_out.find(var.name);
 911         if(i==prev_out.end())
 912                 i = prev_out.find(in_prefix+var.name);
 913         if(i!=prev_out.end())
 914         {
 915                 generate_interface(*i->second, "in", i->second->name);
 916                 var.name = i->second->name;
 917         }
 918 }
 919
 920 void ProgramCompiler::InterfaceGenerator::visit(VariableDeclaration &var)
 921 {
 922         if(var.interface=="out")
 923         {
 924                 if(scope_level==1)
 925                         stage->out_variables[var.name] = &var;
 926                 else if(generate_interface(var, "out", change_prefix(var.name, string())))
 927                 {
 928                         remove_node = true;
 929                         if(var.init_expression)
 930                         {
 931                                 insert_assignment(var.name, var.init_expression->clone());
 932                                 return;
 933                         }
 934                 }
 935         }
 936         else if(var.interface=="in")
 937         {
 938                 stage->in_variables[var.name] = &var;
 939                 if(var.linked_declaration)
 940                         var.linked_declaration->linked_declaration = &var;
 941                 else if(stage->previous)
 942                 {
 943                         const map<string, VariableDeclaration *> &prev_out = stage->previous->out_variables;
 944                         map<string, VariableDeclaration *>::const_iterator i = prev_out.find(var.name);
 945                         if(i!=prev_out.end())
 946                         {
 947                                 var.linked_declaration = i->second;
 948                                 i->second->linked_declaration = &var;
 949                         }
 950                 }
 951         }
 952
 953         TraversingVisitor::visit(var);
 954 }
 955
 956 void ProgramCompiler::InterfaceGenerator::visit(Passthrough &pass)
 957 {
 958         vector<VariableDeclaration *> pass_vars;
 959
 960         for(map<string, VariableDeclaration *>::const_iterator i=stage->in_variables.begin(); i!=stage->in_variables.end(); ++i)
 961                 pass_vars.push_back(i->second);
 962         for(map<string, RefPtr<VariableDeclaration> >::const_iterator i=iface_declarations.begin(); i!=iface_declarations.end(); ++i)
 963                 if(i->second->interface=="in")
 964                         pass_vars.push_back(i->second.get());
 965
 966         if(stage->previous)
 967         {
 968                 const map<string, VariableDeclaration *> &prev_out = stage->previous->out_variables;
 969                 for(map<string, VariableDeclaration *>::const_iterator i=prev_out.begin(); i!=prev_out.end(); ++i)
 970                 {
 971                         bool linked = false;
 972                         for(vector<VariableDeclaration *>::const_iterator j=pass_vars.begin(); (!linked && j!=pass_vars.end()); ++j)
 973                                 linked = ((*j)->linked_declaration==i->second);
 974
 975                         if(!linked && generate_interface(*i->second, "in", i->second->name))
 976                                 pass_vars.push_back(i->second);
 977                 }
 978         }
 979
 980         if(stage->type==GEOMETRY)
 981         {
 982                 VariableReference *ref = new VariableReference;
 983                 ref->name = "gl_in";
 984
 985                 BinaryExpression *subscript = new BinaryExpression;
 986                 subscript->left = ref;
 987                 subscript->oper = "[";
 988                 subscript->right = pass.subscript;
 989                 subscript->after = "]";
 990
 991                 MemberAccess *memacc = new MemberAccess;
 992                 memacc->left = subscript;
 993                 memacc->member = "gl_Position";
 994
 995                 insert_assignment("gl_Position", memacc);
 996         }
 997
 998         for(vector<VariableDeclaration *>::const_iterator i=pass_vars.begin(); i!=pass_vars.end(); ++i)
 999         {
1000                 string out_name = change_prefix((*i)->name, out_prefix);
1001                 generate_interface(**i, "out", out_name);
1002
1003                 VariableReference *ref = new VariableReference;
1004                 ref->name = (*i)->name;
1005                 if(pass.subscript)
1006                 {
1007                         BinaryExpression *subscript = new BinaryExpression;
1008                         subscript->left = ref;
1009                         subscript->oper = "[";
1010                         subscript->right = pass.subscript;
1011                         subscript->after = "]";
1012                         insert_assignment(out_name, subscript);
1013                 }
1014                 else
1015                         insert_assignment(out_name, ref);
1016         }
1017
1018         remove_node = true;
1019 }
1020
1021
1022 ProgramCompiler::DeclarationReorderer::DeclarationReorderer():
1023         scope_level(0),
1024         kind(NO_DECLARATION)
1025 { }
1026
1027 void ProgramCompiler::DeclarationReorderer::visit(FunctionCall &call)
1028 {
1029         FunctionDeclaration *def = call.declaration;
1030         if(def)
1031                 def = def->definition;
1032         if(def && !ordered_funcs.count(def))
1033                 needed_funcs.insert(def);
1034 }
1035
1036 void ProgramCompiler::DeclarationReorderer::visit(Block &block)
1037 {
1038         SetForScope<unsigned> set(scope_level, scope_level+1);
1039         if(scope_level>1)
1040                 return Visitor::visit(block);
1041
1042         list<RefPtr<Node> >::iterator struct_insert_point = block.body.end();
1043         list<RefPtr<Node> >::iterator variable_insert_point = block.body.end();
1044         list<RefPtr<Node> >::iterator function_insert_point = block.body.end();
1045         unsigned unordered_func_count = 0;
1046         bool ordered_any_funcs = false;
1047
1048         for(list<RefPtr<Node> >::iterator i=block.body.begin(); i!=block.body.end(); )
1049         {
1050                 kind = NO_DECLARATION;
1051                 (*i)->visit(*this);
1052
1053                 bool moved = false;
1054                 if(kind==STRUCT && struct_insert_point!=block.body.end())
1055                 {
1056                         block.body.insert(struct_insert_point, *i);
1057                         moved = true;
1058                 }
1059                 else if(kind>STRUCT && struct_insert_point==block.body.end())
1060                         struct_insert_point = i;
1061
1062                 if(kind==VARIABLE && variable_insert_point!=block.body.end())
1063                 {
1064                         block.body.insert(variable_insert_point, *i);
1065                         moved = true;
1066                 }
1067                 else if(kind>VARIABLE && variable_insert_point==block.body.end())
1068                         variable_insert_point = i;
1069
1070                 if(kind==FUNCTION)
1071                 {
1072                         if(function_insert_point==block.body.end())
1073                                 function_insert_point = i;
1074
1075                         if(needed_funcs.empty())
1076                         {
1077                                 ordered_funcs.insert(i->get());
1078                                 if(i!=function_insert_point)
1079                                 {
1080                                         block.body.insert(function_insert_point, *i);
1081                                         moved = true;
1082                                 }
1083                                 else
1084                                         ++function_insert_point;
1085                                 ordered_any_funcs = true;
1086                         }
1087                         else
1088                                 ++unordered_func_count;
1089                 }
1090
1091                 if(moved)
1092                 {
1093                         if(function_insert_point==i)
1094                                 ++function_insert_point;
1095                         block.body.erase(i++);
1096                 }
1097                 else
1098                         ++i;
1099
1100                 if(i==block.body.end() && unordered_func_count)
1101                 {
1102                         if(!ordered_any_funcs)
1103                                 // A subset of the remaining functions forms a recursive loop
1104                                 /* TODO pick a function and move it up, adding any necessary
1105                                 declarations */
1106                                 break;
1107
1108                         i = function_insert_point;
1109                         unordered_func_count = 0;
1110                 }
1111         }
1112 }
1113
1114 void ProgramCompiler::DeclarationReorderer::visit(ProgramSyntax::VariableDeclaration &var)
1115 {
1116         Visitor::visit(var);
1117         kind = VARIABLE;
1118 }
1119
1120 void ProgramCompiler::DeclarationReorderer::visit(FunctionDeclaration &func)
1121 {
1122         needed_funcs.clear();
1123         func.body.visit(*this);
1124         needed_funcs.erase(&func);
1125         kind = FUNCTION;
1126 }
1127
1128
1129 ProgramCompiler::InlineableFunctionLocator::InlineableFunctionLocator():
1130         in_function(0)
1131 { }
1132
1133 void ProgramCompiler::InlineableFunctionLocator::visit(FunctionCall &call)
1134 {
1135         FunctionDeclaration *def = call.declaration;
1136         if(def && def->definition!=def)
1137                 def = def->definition;
1138
1139         if(def)
1140         {
1141                 unsigned &count = refcounts[def];
1142                 ++count;
1143                 if(count>1 || def==in_function)
1144                         inlineable.erase(def);
1145         }
1146
1147         TraversingVisitor::visit(call);
1148 }
1149
1150 void ProgramCompiler::InlineableFunctionLocator::visit(FunctionDeclaration &func)
1151 {
1152         unsigned &count = refcounts[func.definition];
1153         if(!count && func.parameters.empty())
1154                 inlineable.insert(func.definition);
1155
1156         SetForScope<FunctionDeclaration *> set(in_function, &func);
1157         TraversingVisitor::visit(func);
1158 }
1159
1160
1161 ProgramCompiler::FunctionInliner::FunctionInliner():
1162         extract_result(0)
1163 { }
1164
1165 ProgramCompiler::FunctionInliner::FunctionInliner(const set<FunctionDeclaration *> &in):
1166         inlineable(in),
1167         extract_result(0)
1168 { }
1169
1170 void ProgramCompiler::FunctionInliner::visit_and_inline(RefPtr<Expression> &ptr)
1171 {
1172         inline_result = 0;
1173         ptr->visit(*this);
1174         if(inline_result)
1175                 ptr = inline_result;
1176 }
1177
1178 void ProgramCompiler::FunctionInliner::visit(Block &block)
1179 {
1180         if(extract_result)
1181                 --extract_result;
1182
1183         for(list<RefPtr<Node> >::iterator i=block.body.begin(); i!=block.body.end(); ++i)
1184         {
1185                 (*i)->visit(*this);
1186                 if(extract_result)
1187                         --extract_result;
1188         }
1189 }
1190
1191 void ProgramCompiler::FunctionInliner::visit(UnaryExpression &unary)
1192 {
1193         visit_and_inline(unary.expression);
1194         inline_result = 0;
1195 }
1196
1197 void ProgramCompiler::FunctionInliner::visit(BinaryExpression &binary)
1198 {
1199         visit_and_inline(binary.left);
1200         visit_and_inline(binary.right);
1201         inline_result = 0;
1202 }
1203
1204 void ProgramCompiler::FunctionInliner::visit(MemberAccess &memacc)
1205 {
1206         visit_and_inline(memacc.left);
1207         inline_result = 0;
1208 }
1209
1210 void ProgramCompiler::FunctionInliner::visit(FunctionCall &call)
1211 {
1212         for(vector<RefPtr<Expression> >::iterator i=call.arguments.begin(); i!=call.arguments.end(); ++i)
1213                 visit_and_inline(*i);
1214
1215         FunctionDeclaration *def = call.declaration;
1216         if(def && def->definition!=def)
1217                 def = def->definition;
1218
1219         if(def && inlineable.count(def))
1220         {
1221                 extract_result = 2;
1222                 def->visit(*this);
1223         }
1224         else
1225                 inline_result = 0;
1226 }
1227
1228 void ProgramCompiler::FunctionInliner::visit(VariableDeclaration &var)
1229 {
1230         if(var.init_expression)
1231                 visit_and_inline(var.init_expression);
1232         inline_result = 0;
1233 }
1234
1235 void ProgramCompiler::FunctionInliner::visit(Return &ret)
1236 {
1237         TraversingVisitor::visit(ret);
1238
1239         if(extract_result)
1240                 inline_result = ret.expression->clone();
1241 }
1242
1243
1244 ProgramCompiler::ExpressionEvaluator::ExpressionEvaluator():
1245         variable_values(0),
1246         result(0.0f),
1247         result_valid(false)
1248 { }
1249
1250 ProgramCompiler::ExpressionEvaluator::ExpressionEvaluator(const ValueMap &v):
1251         variable_values(&v),
1252         result(0.0f),
1253         result_valid(false)
1254 { }
1255
1256 void ProgramCompiler::ExpressionEvaluator::visit(Literal &literal)
1257 {
1258         if(literal.token=="true")
1259                 result = 1.0f;
1260         else if(literal.token=="false")
1261                 result = 0.0f;
1262         else
1263                 result = lexical_cast<float>(literal.token);
1264         result_valid = true;
1265 }
1266
1267 void ProgramCompiler::ExpressionEvaluator::visit(ParenthesizedExpression &parexp)
1268 {
1269         parexp.expression->visit(*this);
1270 }
1271
1272 void ProgramCompiler::ExpressionEvaluator::visit(VariableReference &var)
1273 {
1274         if(!var.declaration)
1275                 return;
1276
1277         if(variable_values)
1278         {
1279                 ValueMap::const_iterator i = variable_values->find(var.declaration);
1280                 if(i!=variable_values->end())
1281                         i->second->visit(*this);
1282         }
1283         else if(var.declaration->init_expression)
1284                 var.declaration->init_expression->visit(*this);
1285 }
1286
1287 void ProgramCompiler::ExpressionEvaluator::visit(UnaryExpression &unary)
1288 {
1289         result_valid = false;
1290         unary.expression->visit(*this);
1291         if(!result_valid)
1292                 return;
1293
1294         if(unary.oper=="!")
1295                 result = !result;
1296         else
1297                 result_valid = false;
1298 }
1299
1300 void ProgramCompiler::ExpressionEvaluator::visit(BinaryExpression &binary)
1301 {
1302         result_valid = false;
1303         binary.left->visit(*this);
1304         if(!result_valid)
1305                 return;
1306
1307         float left_result = result;
1308         result_valid = false;
1309         binary.right->visit(*this);
1310         if(!result_valid)
1311                 return;
1312
1313         if(binary.oper=="<")
1314                 result = (left_result<result);
1315         else if(binary.oper=="<=")
1316                 result = (left_result<=result);
1317         else if(binary.oper==">")
1318                 result = (left_result>result);
1319         else if(binary.oper==">=")
1320                 result = (left_result>=result);
1321         else if(binary.oper=="==")
1322                 result = (left_result==result);
1323         else if(binary.oper=="!=")
1324                 result = (left_result!=result);
1325         else if(binary.oper=="&&")
1326                 result = (left_result && result);
1327         else if(binary.oper=="||")
1328                 result = (left_result || result);
1329         else
1330                 result_valid = false;
1331 }
1332
1333
1334 ProgramCompiler::ConstantConditionEliminator::ConstantConditionEliminator():
1335         scope_level(0),
1336         record_only(false)
1337 { }
1338
1339 void ProgramCompiler::ConstantConditionEliminator::visit(Block &block)
1340 {
1341         SetForScope<unsigned> set(scope_level, scope_level+1);
1342         BlockModifier::visit(block);
1343
1344         for(map<string, VariableDeclaration *>::const_iterator i=block.variables.begin(); i!=block.variables.end(); ++i)
1345                 variable_values.erase(i->second);
1346 }
1347
1348 void ProgramCompiler::ConstantConditionEliminator::visit(UnaryExpression &unary)
1349 {
1350         if(VariableReference *var = dynamic_cast<VariableReference *>(unary.expression.get()))
1351                 if(unary.oper=="++" || unary.oper=="--")
1352                         variable_values.erase(var->declaration);
1353 }
1354
1355 void ProgramCompiler::ConstantConditionEliminator::visit(Assignment &assign)
1356 {
1357         variable_values.erase(assign.target_declaration);
1358 }
1359
1360 void ProgramCompiler::ConstantConditionEliminator::visit(VariableDeclaration &var)
1361 {
1362         if(var.constant || scope_level>1)
1363                 variable_values[&var] = var.init_expression.get();
1364 }
1365
1366 void ProgramCompiler::ConstantConditionEliminator::visit(Conditional &cond)
1367 {
1368         if(!record_only)
1369         {
1370                 ExpressionEvaluator eval(variable_values);
1371                 cond.condition->visit(eval);
1372                 if(eval.result_valid)
1373                 {
1374                         flatten_block(eval.result ? cond.body : cond.else_body);
1375                         return;
1376                 }
1377         }
1378
1379         TraversingVisitor::visit(cond);
1380 }
1381
1382 void ProgramCompiler::ConstantConditionEliminator::visit(Iteration &iter)
1383 {
1384         if(!record_only)
1385         {
1386                 if(iter.condition)
1387                 {
1388                         /* If the loop condition is always false on the first iteration, the
1389                         entire loop can be removed */
1390                         if(iter.init_statement)
1391                                 iter.init_statement->visit(*this);
1392                         ExpressionEvaluator eval(variable_values);
1393                         iter.condition->visit(eval);
1394                         if(eval.result_valid && !eval.result)
1395                         {
1396                                 remove_node = true;
1397                                 return;
1398                         }
1399                 }
1400
1401                 /* Record all assignments that occur inside the loop body so those
1402                 variables won't be considered as constant */
1403                 SetFlag set_record(record_only);
1404                 TraversingVisitor::visit(iter);
1405         }
1406
1407         TraversingVisitor::visit(iter);
1408
1409         if(VariableDeclaration *init_decl = dynamic_cast<VariableDeclaration *>(iter.init_statement.get()))
1410                 variable_values.erase(init_decl);
1411 }
1412
1413
1414 ProgramCompiler::UnusedVariableLocator::UnusedVariableLocator():
1415         aggregate(0),
1416         assignment(0),
1417         assignment_target(false),
1418         assign_to_subscript(false),
1419         global_scope(true)
1420 { }
1421
1422 void ProgramCompiler::UnusedVariableLocator::apply(Stage &s)
1423 {
1424         variables.push_back(BlockVariableMap());
1425         Visitor::apply(s);
1426         BlockVariableMap &global_variables = variables.back();
1427         for(BlockVariableMap::iterator i=global_variables.begin(); i!=global_variables.end(); ++i)
1428         {
1429                 if(i->first->interface=="out" && (s.type==FRAGMENT || i->first->linked_declaration || !i->first->name.compare(0, 3, "gl_")))
1430                         continue;
1431                 if(!i->second.referenced)
1432                 {
1433                         unused_nodes.insert(i->first);
1434                         clear_assignments(i->second, true);
1435                 }
1436         }
1437         variables.pop_back();
1438 }
1439
1440 void ProgramCompiler::UnusedVariableLocator::visit(VariableReference &var)
1441 {
1442         map<VariableDeclaration *, Node *>::iterator i = aggregates.find(var.declaration);
1443         if(i!=aggregates.end())
1444                 unused_nodes.erase(i->second);
1445
1446         if(var.declaration && !assignment_target)
1447         {
1448                 VariableInfo &var_info = variables.back()[var.declaration];
1449                 var_info.assignments.clear();
1450                 var_info.referenced = true;
1451         }
1452 }
1453
1454 void ProgramCompiler::UnusedVariableLocator::visit(MemberAccess &memacc)
1455 {
1456         TraversingVisitor::visit(memacc);
1457         unused_nodes.erase(memacc.declaration);
1458 }
1459
1460 void ProgramCompiler::UnusedVariableLocator::visit(BinaryExpression &binary)
1461 {
1462         if(binary.oper=="[")
1463         {
1464                 if(assignment_target)
1465                         assign_to_subscript = true;
1466                 binary.left->visit(*this);
1467                 SetForScope<bool> set(assignment_target, false);
1468                 binary.right->visit(*this);
1469         }
1470         else
1471                 TraversingVisitor::visit(binary);
1472 }
1473
1474 void ProgramCompiler::UnusedVariableLocator::visit(Assignment &assign)
1475 {
1476         {
1477                 assign_to_subscript = false;
1478                 SetForScope<bool> set(assignment_target, !assign.self_referencing);
1479                 assign.left->visit(*this);
1480         }
1481         assign.right->visit(*this);
1482         assignment = &assign;
1483 }
1484
1485 void ProgramCompiler::UnusedVariableLocator::record_assignment(VariableDeclaration &var, Node &node, bool chained)
1486 {
1487         VariableInfo &var_info = variables.back()[&var];
1488         if(!chained)
1489                 clear_assignments(var_info, true);
1490         var_info.assignments.push_back(&node);
1491         var_info.conditionally_assigned = false;
1492 }
1493
1494 void ProgramCompiler::UnusedVariableLocator::clear_assignments(VariableInfo &var_info, bool mark_unused)
1495 {
1496         if(mark_unused)
1497         {
1498                 for(vector<Node *>::iterator i=var_info.assignments.begin(); i!=var_info.assignments.end(); ++i)
1499                         unused_nodes.insert(*i);
1500         }
1501         var_info.assignments.clear();
1502 }
1503
1504 void ProgramCompiler::UnusedVariableLocator::visit(ExpressionStatement &expr)
1505 {
1506         assignment = 0;
1507         TraversingVisitor::visit(expr);
1508         if(assignment && assignment->target_declaration)
1509                 record_assignment(*assignment->target_declaration, expr, (assignment->self_referencing || assign_to_subscript));
1510 }
1511
1512 void ProgramCompiler::UnusedVariableLocator::visit(StructDeclaration &strct)
1513 {
1514         SetForScope<Node *> set(aggregate, &strct);
1515         unused_nodes.insert(&strct);
1516         TraversingVisitor::visit(strct);
1517 }
1518
1519 void ProgramCompiler::UnusedVariableLocator::visit(VariableDeclaration &var)
1520 {
1521         if(aggregate)
1522                 aggregates[&var] = aggregate;
1523         else
1524         {
1525                 variables.back()[&var].local = true;
1526                 if(var.init_expression)
1527                         record_assignment(var, *var.init_expression, false);
1528         }
1529         unused_nodes.erase(var.type_declaration);
1530         TraversingVisitor::visit(var);
1531 }
1532
1533 void ProgramCompiler::UnusedVariableLocator::visit(InterfaceBlock &iface)
1534 {
1535         SetForScope<Node *> set(aggregate, &iface);
1536         unused_nodes.insert(&iface);
1537         TraversingVisitor::visit(iface);
1538 }
1539
1540 void ProgramCompiler::UnusedVariableLocator::visit(FunctionDeclaration &func)
1541 {
1542         variables.push_back(BlockVariableMap());
1543
1544         {
1545                 SetForScope<bool> set(global_scope, false);
1546                 for(vector<RefPtr<VariableDeclaration> >::iterator i=func.parameters.begin(); i!=func.parameters.end(); ++i)
1547                         (*i)->visit(*this);
1548                 func.body.visit(*this);
1549         }
1550
1551         BlockVariableMap &block_variables = variables.back();
1552         for(BlockVariableMap::iterator i=block_variables.begin(); i!=block_variables.end(); ++i)
1553                 i->second.conditionally_assigned = true;
1554         for(vector<RefPtr<VariableDeclaration> >::iterator i=func.parameters.begin(); i!=func.parameters.end(); ++i)
1555                 block_variables[i->get()].referenced = true;
1556         merge_down_variables();
1557 }
1558
1559 void ProgramCompiler::UnusedVariableLocator::merge_down_variables()
1560 {
1561         BlockVariableMap &parent_variables = variables[variables.size()-2];
1562         BlockVariableMap &block_variables = variables.back();
1563         for(BlockVariableMap::iterator i=block_variables.begin(); i!=block_variables.end(); ++i)
1564         {
1565                 if(i->second.local)
1566                 {
1567                         if(!i->second.referenced)
1568                                 unused_nodes.insert(i->first);
1569                         clear_assignments(i->second, true);
1570                         continue;
1571                 }
1572
1573                 BlockVariableMap::iterator j = parent_variables.find(i->first);
1574                 if(j==parent_variables.end())
1575                         parent_variables.insert(*i);
1576                 else
1577                 {
1578                         if(i->second.referenced || !i->second.conditionally_assigned)
1579                                 clear_assignments(j->second, !i->second.referenced);
1580                         j->second.conditionally_assigned = i->second.conditionally_assigned;
1581                         j->second.referenced |= i->second.referenced;
1582                         j->second.assignments.insert(j->second.assignments.end(), i->second.assignments.begin(), i->second.assignments.end());
1583                 }
1584         }
1585         variables.pop_back();
1586 }
1587
1588 void ProgramCompiler::UnusedVariableLocator::visit(Conditional &cond)
1589 {
1590         cond.condition->visit(*this);
1591         variables.push_back(BlockVariableMap());
1592         cond.body.visit(*this);
1593
1594         BlockVariableMap if_variables;
1595         swap(variables.back(), if_variables);
1596         cond.else_body.visit(*this);
1597
1598         BlockVariableMap &else_variables = variables.back();
1599         for(BlockVariableMap::iterator i=else_variables.begin(); i!=else_variables.end(); ++i)
1600         {
1601                 BlockVariableMap::iterator j = if_variables.find(i->first);
1602                 if(j!=if_variables.end())
1603                 {
1604                         i->second.assignments.insert(i->second.assignments.end(), j->second.assignments.begin(), j->second.assignments.end());
1605                         i->second.conditionally_assigned |= j->second.conditionally_assigned;
1606                         if_variables.erase(j);
1607                 }
1608                 else
1609                         i->second.conditionally_assigned = true;
1610         }
1611
1612         for(BlockVariableMap::iterator i=if_variables.begin(); i!=if_variables.end(); ++i)
1613         {
1614                 i->second.conditionally_assigned = true;
1615                 else_variables.insert(*i);
1616         }
1617
1618         merge_down_variables();
1619 }
1620
1621 void ProgramCompiler::UnusedVariableLocator::visit(Iteration &iter)
1622 {
1623         variables.push_back(BlockVariableMap());
1624         TraversingVisitor::visit(iter);
1625
1626         BlockVariableMap &block_variables = variables.back();
1627         for(BlockVariableMap::iterator i=block_variables.begin(); i!=block_variables.end(); ++i)
1628                 if(!i->second.local && i->second.referenced)
1629                         i->second.assignments.clear();
1630
1631         merge_down_variables();
1632 }
1633
1634
1635 ProgramCompiler::UnusedVariableLocator::VariableInfo::VariableInfo():
1636         local(false),
1637         conditionally_assigned(false),
1638         referenced(false)
1639 { }
1640
1641
1642 void ProgramCompiler::UnusedFunctionLocator::visit(FunctionCall &call)
1643 {
1644         TraversingVisitor::visit(call);
1645
1646         unused_nodes.erase(call.declaration);
1647         if(call.declaration && call.declaration->definition!=call.declaration)
1648                 used_definitions.insert(call.declaration->definition);
1649 }
1650
1651 void ProgramCompiler::UnusedFunctionLocator::visit(FunctionDeclaration &func)
1652 {
1653         TraversingVisitor::visit(func);
1654
1655         if((func.name!="main" || func.body.body.empty()) && !used_definitions.count(&func))
1656                 unused_nodes.insert(&func);
1657 }
1658
1659
1660 ProgramCompiler::NodeRemover::NodeRemover(const set<Node *> &r):
1661         to_remove(r)
1662 { }
1663
1664 void ProgramCompiler::NodeRemover::visit(Block &block)
1665 {
1666         for(list<RefPtr<Node> >::iterator i=block.body.begin(); i!=block.body.end(); )
1667         {
1668                 (*i)->visit(*this);
1669                 if(to_remove.count(i->get()))
1670                         block.body.erase(i++);
1671                 else
1672                         ++i;
1673         }
1674 }
1675
1676 void ProgramCompiler::NodeRemover::visit(VariableDeclaration &var)
1677 {
1678         if(to_remove.count(&var))
1679         {
1680                 stage->in_variables.erase(var.name);
1681                 stage->out_variables.erase(var.name);
1682                 stage->locations.erase(var.name);
1683                 if(var.linked_declaration)
1684                         var.linked_declaration->linked_declaration = 0;
1685         }
1686         else if(var.init_expression && to_remove.count(var.init_expression.get()))
1687                 var.init_expression = 0;
1688 }
1689
1690 void ProgramCompiler::NodeRemover::visit(Iteration &iter)
1691 {
1692         if(to_remove.count(iter.init_statement.get()))
1693                 iter.init_statement = 0;
1694         TraversingVisitor::visit(iter);
1695 }
1696
1697
1698 void ProgramCompiler::PrecisionRemover::visit(Precision &)
1699 {
1700         remove_node = true;
1701 }
1702
1703 void ProgramCompiler::PrecisionRemover::visit(VariableDeclaration &var)
1704 {
1705         var.precision.clear();
1706 }
1707
1708
1709 ProgramCompiler::DefaultPrecisionGenerator::DefaultPrecisionGenerator():
1710         toplevel(true)
1711 { }
1712
1713 void ProgramCompiler::DefaultPrecisionGenerator::visit(Block &block)
1714 {
1715         if(toplevel)
1716         {
1717                 SetForScope<bool> set(toplevel, false);
1718                 BlockModifier::visit(block);
1719         }
1720         else
1721                 Visitor::visit(block);
1722 }
1723
1724 void ProgramCompiler::DefaultPrecisionGenerator::visit(Precision &prec)
1725 {
1726         have_default.insert(prec.type);
1727 }
1728
1729 void ProgramCompiler::DefaultPrecisionGenerator::visit(VariableDeclaration &var)
1730 {
1731         if(var.type_declaration)
1732                 return;
1733
1734         string type = var.type;
1735         if(!type.compare(0, 3, "vec") || !type.compare(0, 3, "mat"))
1736                 type = "float";
1737         else if(!type.compare(0, 3, "ivec") || type=="uint")
1738                 type = "int";
1739
1740         if(!have_default.count(type))
1741         {
1742                 Precision *prec = new Precision;
1743                 if(!type.compare(0, 7, "sampler"))
1744                         prec->precision = "lowp";
1745                 else if(stage->type==FRAGMENT)
1746                         prec->precision = "mediump";
1747                 else
1748                         prec->precision = "highp";
1749                 prec->type = type;
1750                 insert_nodes.push_back(prec);
1751
1752                 have_default.insert(type);
1753         }
1754 }
1755
1756
1757 ProgramCompiler::LegacyConverter::LegacyConverter():
1758         target_api(get_gl_api()),
1759         target_version(get_glsl_version()),
1760         frag_out(0)
1761 { }
1762
1763 ProgramCompiler::LegacyConverter::LegacyConverter(const Version &v):
1764         target_api(get_gl_api()),
1765         target_version(v),
1766         frag_out(0)
1767 { }
1768
1769 bool ProgramCompiler::LegacyConverter::check_version(const Version &feature_version) const
1770 {
1771         if(target_version<feature_version)
1772                 return false;
1773         else if(stage->required_version<feature_version)
1774                 stage->required_version = feature_version;
1775
1776         return true;
1777 }
1778
1779 bool ProgramCompiler::LegacyConverter::supports_unified_interface_syntax() const
1780 {
1781         if(target_api==OPENGL_ES2)
1782                 return check_version(Version(3, 0));
1783         else
1784                 return check_version(Version(1, 30));
1785 }
1786
1787 void ProgramCompiler::LegacyConverter::visit(VariableReference &var)
1788 {
1789         if(var.declaration==frag_out && !supports_unified_interface_syntax())
1790         {
1791                 var.name = "gl_FragColor";
1792                 var.declaration = 0;
1793                 type = "vec4";
1794         }
1795         else if(var.declaration)
1796                 type = var.declaration->type;
1797         else
1798                 type = string();
1799 }
1800
1801 void ProgramCompiler::LegacyConverter::visit(Assignment &assign)
1802 {
1803         TraversingVisitor::visit(assign);
1804         if(assign.target_declaration==frag_out && !supports_unified_interface_syntax())
1805                 assign.target_declaration = 0;
1806 }
1807
1808 bool ProgramCompiler::LegacyConverter::supports_unified_sampling_functions() const
1809 {
1810         if(target_api==OPENGL_ES2)
1811                 return check_version(Version(3, 0));
1812         else
1813                 return check_version(Version(1, 30));
1814 }
1815
1816 void ProgramCompiler::LegacyConverter::visit(FunctionCall &call)
1817 {
1818         if(call.name=="texture" && !call.declaration && !supports_unified_sampling_functions())
1819         {
1820                 vector<RefPtr<Expression> >::iterator i = call.arguments.begin();
1821                 if(i!=call.arguments.end())
1822                 {
1823                         (*i)->visit(*this);
1824                         if(type=="sampler1D")
1825                                 call.name = "texture1D";
1826                         else if(type=="sampler2D")
1827                                 call.name = "texture2D";
1828                         else if(type=="sampler3D")
1829                                 call.name = "texture3D";
1830                         else if(type=="sampler1DShadow")
1831                                 call.name = "shadow1D";
1832                         else if(type=="sampler2DShadow")
1833                                 call.name = "shadow2D";
1834
1835                         for(; i!=call.arguments.end(); ++i)
1836                                 (*i)->visit(*this);
1837                 }
1838         }
1839         else
1840                 TraversingVisitor::visit(call);
1841 }
1842
1843 bool ProgramCompiler::LegacyConverter::supports_interface_layouts() const
1844 {
1845         if(target_api==OPENGL_ES2)
1846                 return check_version(Version(3, 0));
1847         else
1848                 return check_version(Version(3, 30));
1849 }
1850
1851 bool ProgramCompiler::LegacyConverter::supports_centroid_sampling() const
1852 {
1853         if(target_api==OPENGL_ES2)
1854                 return check_version(Version(3, 0));
1855         else
1856                 return check_version(Version(1, 20));
1857 }
1858
1859 bool ProgramCompiler::LegacyConverter::supports_sample_sampling() const
1860 {
1861         if(target_api==OPENGL_ES2)
1862                 return check_version(Version(3, 20));
1863         else
1864                 return check_version(Version(4, 0));
1865 }
1866
1867 void ProgramCompiler::LegacyConverter::visit(VariableDeclaration &var)
1868 {
1869         if(var.layout && !supports_interface_layouts())
1870         {
1871                 vector<Layout::Qualifier>::iterator i;
1872                 for(i=var.layout->qualifiers.begin(); (i!=var.layout->qualifiers.end() && i->identifier!="location"); ++i) ;
1873                 if(i!=var.layout->qualifiers.end())
1874                 {
1875                         unsigned location = lexical_cast<unsigned>(i->value);
1876                         if(stage->type==VERTEX && var.interface=="in")
1877                         {
1878                                 stage->locations[var.name] = location;
1879                                 var.layout->qualifiers.erase(i);
1880                         }
1881                         else if(stage->type==FRAGMENT && var.interface=="out")
1882                         {
1883                                 if(location!=0)
1884                                         static Require _req(EXT_gpu_shader4);
1885                                 stage->locations[var.name] = location;
1886                                 var.layout->qualifiers.erase(i);
1887                         }
1888
1889                         if(var.layout->qualifiers.empty())
1890                                 var.layout = 0;
1891                 }
1892         }
1893
1894         if(var.sampling=="centroid")
1895         {
1896                 if(!supports_centroid_sampling())
1897                         var.sampling = string();
1898         }
1899         else if(var.sampling=="sample")
1900         {
1901                 if(!supports_sample_sampling())
1902                         var.sampling = string();
1903         }
1904
1905         if((var.interface=="in" || var.interface=="out") && !supports_unified_interface_syntax())
1906         {
1907                 if(stage->type==FRAGMENT && var.interface=="out")
1908                 {
1909                         frag_out = &var;
1910                         remove_node = true;
1911                 }
1912         }
1913
1914         TraversingVisitor::visit(var);
1915 }
1916
1917 bool ProgramCompiler::LegacyConverter::supports_interface_blocks(const string &iface) const
1918 {
1919         if(target_api==OPENGL_ES2)
1920         {
1921                 if(iface=="uniform")
1922                         return check_version(Version(3, 0));
1923                 else
1924                         return check_version(Version(3, 20));
1925         }
1926         else
1927                 return check_version(Version(1, 50));
1928 }
1929
1930 void ProgramCompiler::LegacyConverter::visit(InterfaceBlock &iface)
1931 {
1932         if(!supports_interface_blocks(iface.interface))
1933                 flatten_block(iface.members);
1934 }
1935
1936 } // namespace GL
1937 } // namespace Msp