source/programcompiler.cpp

   1 #include <msp/core/raii.h>
   2 #include <msp/strings/format.h>
   3 #include <msp/strings/utils.h>
   4 #include "error.h"
   5 #include "program.h"
   6 #include "programcompiler.h"
   7 #include "shader.h"
   8
   9 using namespace std;
  10
  11 namespace Msp {
  12 namespace GL {
  13
  14 using namespace ProgramSyntax;
  15
  16 ProgramCompiler::ProgramCompiler():
  17         module(0)
  18 { }
  19
  20 void ProgramCompiler::compile(const string &source)
  21 {
  22         module = &parser.parse(source);
  23         process();
  24 }
  25
  26 void ProgramCompiler::compile(IO::Base &io)
  27 {
  28         module = &parser.parse(io);
  29         process();
  30 }
  31
  32 void ProgramCompiler::add_shaders(Program &program)
  33 {
  34         if(!module)
  35                 throw invalid_operation("ProgramCompiler::add_shaders");
  36
  37         string head = "#version 150\n";
  38         if(module->vertex_context.present)
  39                 program.attach_shader_owned(new VertexShader(head+format_context(module->vertex_context)));
  40         if(module->geometry_context.present)
  41                 program.attach_shader_owned(new GeometryShader(head+format_context(module->geometry_context)));
  42         if(module->fragment_context.present)
  43                 program.attach_shader_owned(new FragmentShader(head+format_context(module->fragment_context)));
  44
  45         program.bind_attribute(VERTEX4, "vertex");
  46         program.bind_attribute(NORMAL3, "normal");
  47         program.bind_attribute(COLOR4_FLOAT, "color");
  48         program.bind_attribute(TEXCOORD4, "texcoord");
  49 }
  50
  51 void ProgramCompiler::process()
  52 {
  53         if(module->vertex_context.present)
  54                 process(module->vertex_context);
  55         if(module->geometry_context.present)
  56                 process(module->geometry_context);
  57         if(module->fragment_context.present)
  58                 process(module->fragment_context);
  59 }
  60
  61 void ProgramCompiler::process(Context &context)
  62 {
  63         inject_block(context.content, module->global_context.content);
  64
  65         VariableResolver resolver;
  66         context.content.visit(resolver);
  67
  68         while(1)
  69         {
  70                 UnusedVariableLocator unused_locator;
  71                 context.content.visit(unused_locator);
  72
  73                 NodeRemover remover;
  74                 remover.to_remove.insert(unused_locator.unused_variables.begin(), unused_locator.unused_variables.end());
  75                 context.content.visit(remover);
  76
  77                 if(!remover.n_removed)
  78                         break;
  79         }
  80 }
  81
  82 void ProgramCompiler::inject_block(Block &target, const Block &source)
  83 {
  84         list<NodePtr<Node> >::iterator insert_point = target.body.begin();
  85         for(list<NodePtr<Node> >::const_iterator i=source.body.begin(); i!=source.body.end(); ++i)
  86                 target.body.insert(insert_point, (*i)->clone());
  87 }
  88
  89 string ProgramCompiler::format_context(Context &context)
  90 {
  91         Formatter formatter;
  92         context.content.visit(formatter);
  93         return formatter.formatted;
  94 }
  95
  96
  97 ProgramCompiler::Formatter::Formatter():
  98         indent(0),
  99         parameter_list(false),
 100         else_if(false)
 101 { }
 102
 103 void ProgramCompiler::Formatter::visit(Literal &literal)
 104 {
 105         formatted += literal.token;
 106 }
 107
 108 void ProgramCompiler::Formatter::visit(ParenthesizedExpression &parexpr)
 109 {
 110         formatted += '(';
 111         parexpr.expression->visit(*this);
 112         formatted += ')';
 113 }
 114
 115 void ProgramCompiler::Formatter::visit(VariableReference &var)
 116 {
 117         formatted += var.name;
 118 }
 119
 120 void ProgramCompiler::Formatter::visit(MemberAccess &memacc)
 121 {
 122         memacc.left->visit(*this);
 123         formatted += format(".%s", memacc.member);
 124 }
 125
 126 void ProgramCompiler::Formatter::visit(UnaryExpression &unary)
 127 {
 128         if(unary.prefix)
 129                 formatted += unary.oper;
 130         unary.expression->visit(*this);
 131         if(!unary.prefix)
 132                 formatted += unary.oper;
 133 }
 134
 135 void ProgramCompiler::Formatter::visit(BinaryExpression &binary)
 136 {
 137         binary.left->visit(*this);
 138         if(binary.assignment)
 139                 formatted += format(" %s ", binary.oper);
 140         else
 141                 formatted += binary.oper;
 142         binary.right->visit(*this);
 143         formatted += binary.after;
 144 }
 145
 146 void ProgramCompiler::Formatter::visit(FunctionCall &call)
 147 {
 148         formatted += format("%s(", call.name);
 149         for(vector<NodePtr<Expression> >::iterator i=call.arguments.begin(); i!=call.arguments.end(); ++i)
 150         {
 151                 if(i!=call.arguments.begin())
 152                         formatted += ", ";
 153                 (*i)->visit(*this);
 154         }
 155         formatted += ')';
 156 }
 157
 158 void ProgramCompiler::Formatter::visit(ExpressionStatement &expr)
 159 {
 160         expr.expression->visit(*this);
 161         formatted += ';';
 162 }
 163
 164 void ProgramCompiler::Formatter::visit(Block &block)
 165 {
 166         if(block.use_braces)
 167         {
 168                 if(else_if)
 169                 {
 170                         formatted += '\n';
 171                         else_if = false;
 172                 }
 173                 formatted += format("%s{\n", string(indent*2, ' '));
 174         }
 175
 176         bool change_indent = (!formatted.empty() && !else_if);
 177         indent += change_indent;
 178         string spaces(indent*2, ' ');
 179         for(list<NodePtr<Node> >::iterator i=block.body.begin(); i!=block.body.end(); ++i)
 180         {
 181                 if(i!=block.body.begin())
 182                         formatted += '\n';
 183                 if(!else_if)
 184                         formatted += spaces;
 185                 (*i)->visit(*this);
 186         }
 187         indent -= change_indent;
 188
 189         if(block.use_braces)
 190                 formatted += format("\n%s}", string(indent*2, ' '));
 191 }
 192
 193 void ProgramCompiler::Formatter::visit(Layout &layout)
 194 {
 195         formatted += "layout(";
 196         for(vector<Layout::Qualifier>::const_iterator i=layout.qualifiers.begin(); i!=layout.qualifiers.end(); ++i)
 197         {
 198                 if(i!=layout.qualifiers.begin())
 199                         formatted += ", ";
 200                 formatted += i->identifier;
 201                 if(!i->value.empty())
 202                         formatted += format("=%s", i->value);
 203         }
 204         formatted += format(") %s;", layout.interface);
 205 }
 206
 207 void ProgramCompiler::Formatter::visit(StructDeclaration &strct)
 208 {
 209         formatted += format("struct %s\n", strct.name);
 210         strct.members.visit(*this);
 211         formatted += ';';
 212 }
 213
 214 void ProgramCompiler::Formatter::visit(VariableDeclaration &var)
 215 {
 216         if(var.constant)
 217                 formatted += "const ";
 218         if(!var.sampling.empty())
 219                 formatted += format("%s ", var.sampling);
 220         if(!var.interface.empty())
 221                 formatted += format("%s ", var.interface);
 222         formatted += format("%s %s", var.type, var.name);
 223         if(var.array)
 224         {
 225                 formatted += '[';
 226                 if(var.array_size)
 227                         var.array_size->visit(*this);
 228                 formatted += ']';
 229         }
 230         if(var.init_expression)
 231         {
 232                 formatted += " = ";
 233                 var.init_expression->visit(*this);
 234         }
 235         if(!parameter_list)
 236                 formatted += ';';
 237 }
 238
 239 void ProgramCompiler::Formatter::visit(InterfaceBlock &iface)
 240 {
 241         formatted += format("%s %s\n", iface.interface, iface.name);
 242         iface.members.visit(*this);
 243         formatted += ';';
 244 }
 245
 246 void ProgramCompiler::Formatter::visit(FunctionDeclaration &func)
 247 {
 248         formatted += format("%s %s(", func.return_type, func.name);
 249         for(vector<NodePtr<VariableDeclaration> >::iterator i=func.parameters.begin(); i!=func.parameters.end(); ++i)
 250         {
 251                 if(i!=func.parameters.begin())
 252                         formatted += ", ";
 253                 SetFlag set(parameter_list);
 254                 (*i)->visit(*this);
 255         }
 256         formatted += ')';
 257         if(func.definition)
 258         {
 259                 formatted += '\n';
 260                 func.body.visit(*this);
 261         }
 262         else
 263                 formatted += ';';
 264 }
 265
 266 void ProgramCompiler::Formatter::visit(Conditional &cond)
 267 {
 268         if(else_if)
 269         {
 270                 formatted += ' ';
 271                 else_if = false;
 272         }
 273
 274         formatted += "if(";
 275         cond.condition->visit(*this);
 276         formatted += ")\n";
 277
 278         cond.body.visit(*this);
 279         if(!cond.else_body.body.empty())
 280         {
 281                 formatted += format("\n%selse", string(indent*2, ' '));
 282                 SetFlag set(else_if);
 283                 cond.else_body.visit(*this);
 284         }
 285 }
 286
 287 void ProgramCompiler::Formatter::visit(Iteration &iter)
 288 {
 289         formatted += "for(";
 290         iter.init_statement->visit(*this);
 291         formatted += ' ';
 292         iter.condition->visit(*this);
 293         formatted += "; ";
 294         iter.loop_expression->visit(*this);
 295         formatted += ")\n";
 296         iter.body.visit(*this);
 297 }
 298
 299 void ProgramCompiler::Formatter::visit(Return &ret)
 300 {
 301         formatted += "return ";
 302         ret.expression->visit(*this);
 303         formatted += ';';
 304 }
 305
 306
 307 ProgramCompiler::VariableResolver::VariableResolver():
 308         anonymous(false)
 309 { }
 310
 311 void ProgramCompiler::VariableResolver::visit(Block &block)
 312 {
 313         blocks.push_back(&block);
 314         block.variables.clear();
 315         TraversingVisitor::visit(block);
 316         blocks.pop_back();
 317 }
 318
 319 void ProgramCompiler::VariableResolver::visit(VariableReference &var)
 320 {
 321         var.declaration = 0;
 322         type = 0;
 323         for(vector<Block *>::iterator i=blocks.end(); i!=blocks.begin(); )
 324         {
 325                 --i;
 326                 map<string, VariableDeclaration *>::iterator j = (*i)->variables.find(var.name);
 327                 if(j!=(*i)->variables.end())
 328                 {
 329                         var.declaration = j->second;
 330                         type = j->second->type_declaration;
 331                         break;
 332                 }
 333         }
 334 }
 335
 336 void ProgramCompiler::VariableResolver::visit(MemberAccess &memacc)
 337 {
 338         type = 0;
 339         TraversingVisitor::visit(memacc);
 340         memacc.declaration = 0;
 341         if(type)
 342         {
 343                 map<string, VariableDeclaration *>::iterator i = type->members.variables.find(memacc.member);
 344                 if(i!=type->members.variables.end())
 345                 {
 346                         memacc.declaration = i->second;
 347                         type = i->second->type_declaration;
 348                 }
 349                 else
 350                         type = 0;
 351         }
 352 }
 353
 354 void ProgramCompiler::VariableResolver::visit(BinaryExpression &binary)
 355 {
 356         if(binary.oper=="[")
 357         {
 358                 binary.right->visit(*this);
 359                 type = 0;
 360                 binary.left->visit(*this);
 361         }
 362         else
 363         {
 364                 TraversingVisitor::visit(binary);
 365                 type = 0;
 366         }
 367 }
 368
 369 void ProgramCompiler::VariableResolver::visit(StructDeclaration &strct)
 370 {
 371         TraversingVisitor::visit(strct);
 372         blocks.back()->types[strct.name] = &strct;
 373 }
 374
 375 void ProgramCompiler::VariableResolver::visit(VariableDeclaration &var)
 376 {
 377         for(vector<Block *>::iterator i=blocks.end(); i!=blocks.begin(); )
 378         {
 379                 --i;
 380                 map<string, StructDeclaration *>::iterator j = (*i)->types.find(var.type);
 381                 if(j!=(*i)->types.end())
 382                         var.type_declaration = j->second;
 383         }
 384
 385         TraversingVisitor::visit(var);
 386         blocks.back()->variables[var.name] = &var;
 387         if(anonymous && blocks.size()>1)
 388                 blocks[blocks.size()-2]->variables[var.name] = &var;
 389 }
 390
 391 void ProgramCompiler::VariableResolver::visit(InterfaceBlock &iface)
 392 {
 393         SetFlag set(anonymous);
 394         TraversingVisitor::visit(iface);
 395 }
 396
 397
 398 void ProgramCompiler::UnusedVariableLocator::visit(VariableReference &var)
 399 {
 400         unused_variables.erase(var.declaration);
 401 }
 402
 403 void ProgramCompiler::UnusedVariableLocator::visit(MemberAccess &memacc)
 404 {
 405         TraversingVisitor::visit(memacc);
 406         unused_variables.erase(memacc.declaration);
 407 }
 408
 409 void ProgramCompiler::UnusedVariableLocator::visit(VariableDeclaration &var)
 410 {
 411         unused_variables.insert(&var);
 412         TraversingVisitor::visit(var);
 413 }
 414
 415
 416 ProgramCompiler::NodeRemover::NodeRemover():
 417         n_removed(0),
 418         immutable_block(false),
 419         remove_block(false)
 420 { }
 421
 422 void ProgramCompiler::NodeRemover::visit(Block &block)
 423 {
 424         remove_block = immutable_block;
 425         for(list<NodePtr<Node> >::iterator i=block.body.begin(); i!=block.body.end(); )
 426         {
 427                 bool remove = false;
 428                 if(to_remove.count(&**i))
 429                         remove = !immutable_block;
 430                 else
 431                 {
 432                         remove_block = false;
 433                         (*i)->visit(*this);
 434                         remove = remove_block;
 435                 }
 436
 437                 if(remove)
 438                         block.body.erase(i++);
 439                 else
 440                         ++i;
 441
 442                 n_removed += remove;
 443         }
 444 }
 445
 446 void ProgramCompiler::NodeRemover::visit(StructDeclaration &strct)
 447 {
 448         SetFlag set(immutable_block);
 449         TraversingVisitor::visit(strct);
 450 }
 451
 452 void ProgramCompiler::NodeRemover::visit(InterfaceBlock &iface)
 453 {
 454         SetFlag set(immutable_block);
 455         TraversingVisitor::visit(iface);
 456 }
 457
 458 } // namespace GL
 459 } // namespace Msp