source/glsl/output.cpp

   1 #include <msp/core/raii.h>
   2 #include <msp/strings/format.h>
   3 #include "output.h"
   4
   5 using namespace std;
   6
   7 namespace Msp {
   8 namespace GL {
   9 namespace SL {
  10
  11 Formatter::Formatter():
  12         stage(0),
  13         mode(Compiler::PROGRAM),
  14         source_index(0),
  15         source_line(1),
  16         indent(0),
  17         parameter_list(false)
  18 { }
  19
  20 const string &Formatter::apply(Stage &s, Compiler::Mode m)
  21 {
  22         mode = m;
  23         stage = &s;
  24
  25         const Version &ver = s.required_features.glsl_version;
  26
  27         if(ver)
  28         {
  29                 append(format("#version %d%02d", ver.major, ver.minor));
  30                 if(s.required_features.gl_api==OPENGL_ES2 && ver>=Version(3, 0))
  31                         append(" es");
  32                 formatted += '\n';
  33         }
  34
  35         if(s.required_features.arb_explicit_attrib_location)
  36                 append("#extension arb_explicit_attrib_location: require\n");
  37         if(s.required_features.arb_gpu_shader5)
  38                 append("#extension arb_gpu_shader5: require\n");
  39         if(s.required_features.arb_uniform_buffer_object)
  40                 append("#extension arb_uniform_buffer_object: require\n");
  41         if(s.required_features.ext_gpu_shader4)
  42                 append("#extension ext_gpu_shader4: require\n");
  43         if(s.required_features.ext_texture_array)
  44                 append("#extension ext_texture_array: require\n");
  45         formatted += '\n';
  46
  47         s.content.visit(*this);
  48
  49         return formatted;
  50 }
  51
  52 void Formatter::append(const string &text)
  53 {
  54         formatted += text;
  55         for(string::const_iterator i=text.begin(); i!=text.end(); ++i)
  56                 if(*i=='\n')
  57                         ++source_line;
  58 }
  59
  60 void Formatter::append(char c)
  61 {
  62         formatted += c;
  63         if(c=='\n')
  64                 ++source_line;
  65 }
  66
  67 void Formatter::set_source(unsigned index, unsigned line)
  68 {
  69         if(index!=source_index || (index && line!=source_line))
  70         {
  71                 if(index==source_index && line==source_line+1)
  72                         formatted += '\n';
  73                 else
  74                 {
  75                         unsigned l = line;
  76                         if(mode==Compiler::PROGRAM && stage && stage->required_features.glsl_version<Version(3, 30))
  77                                 --l;
  78                         formatted += format("#line %d %d\n", l, index);
  79                 }
  80         }
  81         source_index = index;
  82         source_line = line;
  83 }
  84
  85 void Formatter::visit(Block &block)
  86 {
  87         unsigned brace_indent = indent;
  88         bool use_braces = (block.use_braces || (indent && block.body.size()!=1));
  89         if(use_braces)
  90                 append(format("%s{\n", string(brace_indent*2, ' ')));
  91
  92         SetForScope<unsigned> set(indent, indent+(indent>0 || use_braces));
  93         string spaces(indent*2, ' ');
  94         bool first = true;
  95         for(NodeList<Statement>::iterator i=block.body.begin(); i!=block.body.end(); ++i)
  96         {
  97                 if((*i)->source==BUILTIN_SOURCE)
  98                         continue;
  99                 if(!first)
 100                         append('\n');
 101                 first = false;
 102                 set_source((*i)->source, (*i)->line);
 103                 append(spaces);
 104                 (*i)->visit(*this);
 105         }
 106
 107         if(use_braces)
 108                 append(format("\n%s}", string(brace_indent*2, ' ')));
 109 }
 110
 111 void Formatter::visit(Literal &literal)
 112 {
 113         append(literal.token);
 114 }
 115
 116 void Formatter::visit(ParenthesizedExpression &parexpr)
 117 {
 118         append('(');
 119         parexpr.expression->visit(*this);
 120         append(')');
 121 }
 122
 123 void Formatter::visit(VariableReference &var)
 124 {
 125         append(var.name);
 126 }
 127
 128 void Formatter::visit(InterfaceBlockReference &iface)
 129 {
 130         append(iface.name);
 131 }
 132
 133 void Formatter::visit(MemberAccess &memacc)
 134 {
 135         memacc.left->visit(*this);
 136         append(format(".%s", memacc.member));
 137 }
 138
 139 void Formatter::visit(UnaryExpression &unary)
 140 {
 141         if(unary.oper->type==Operator::PREFIX)
 142                 append(unary.oper->token);
 143         unary.expression->visit(*this);
 144         if(unary.oper->type==Operator::POSTFIX)
 145                 append(unary.oper->token);
 146 }
 147
 148 void Formatter::visit(BinaryExpression &binary)
 149 {
 150         binary.left->visit(*this);
 151         append(binary.oper->token);
 152         binary.right->visit(*this);
 153         if(binary.oper->token[0]=='[')
 154                 append(']');
 155 }
 156
 157 void Formatter::visit(Assignment &assign)
 158 {
 159         assign.left->visit(*this);
 160         append(format(" %s ", assign.oper->token));
 161         assign.right->visit(*this);
 162 }
 163
 164 void Formatter::visit(FunctionCall &call)
 165 {
 166         append(format("%s(", call.name));
 167         for(NodeArray<Expression>::iterator i=call.arguments.begin(); i!=call.arguments.end(); ++i)
 168         {
 169                 if(i!=call.arguments.begin())
 170                         append(", ");
 171                 (*i)->visit(*this);
 172         }
 173         append(')');
 174 }
 175
 176 void Formatter::visit(ExpressionStatement &expr)
 177 {
 178         expr.expression->visit(*this);
 179         append(';');
 180 }
 181
 182 void Formatter::visit(Import &import)
 183 {
 184         append(format("import %s;", import.module));
 185 }
 186
 187 void Formatter::visit(Precision &prec)
 188 {
 189         append(format("precision %s %s;", prec.precision, prec.type));
 190 }
 191
 192 void Formatter::visit(Layout &layout)
 193 {
 194         append("layout(");
 195         for(vector<Layout::Qualifier>::const_iterator i=layout.qualifiers.begin(); i!=layout.qualifiers.end(); ++i)
 196         {
 197                 if(i!=layout.qualifiers.begin())
 198                         append(", ");
 199                 append(i->name);
 200                 if(i->has_value)
 201                         append(format("=%d", i->value));
 202         }
 203         append(')');
 204 }
 205
 206 void Formatter::visit(InterfaceLayout &layout)
 207 {
 208         layout.layout.visit(*this);
 209         append(format(" %s;", layout.interface));
 210 }
 211
 212 void Formatter::visit(StructDeclaration &strct)
 213 {
 214         append(format("struct %s\n", strct.name));
 215         strct.members.visit(*this);
 216         append(';');
 217 }
 218
 219 void Formatter::visit(VariableDeclaration &var)
 220 {
 221         if(var.layout)
 222         {
 223                 var.layout->visit(*this);
 224                 append(' ');
 225         }
 226         if(var.constant)
 227                 append("const ");
 228         if(!var.interpolation.empty())
 229                 append(format("%s ", var.interpolation));
 230         if(!var.sampling.empty())
 231                 append(format("%s ", var.sampling));
 232         if(!var.interface.empty() && var.interface!=block_interface)
 233         {
 234                 string interface = var.interface;
 235                 if(mode==Compiler::PROGRAM && stage && stage->required_features.glsl_version<Version(1, 30))
 236                 {
 237                         if(stage->type==Stage::VERTEX && var.interface=="in")
 238                                 interface = "attribute";
 239                         else if((stage->type==Stage::VERTEX && var.interface=="out") || (stage->type==Stage::FRAGMENT && var.interface=="in"))
 240                                 interface = "varying";
 241                 }
 242                 append(format("%s ", interface));
 243         }
 244         if(!var.precision.empty())
 245                 append(format("%s ", var.precision));
 246         append(format("%s %s", var.type_declaration->name, var.name));
 247         if(var.array)
 248         {
 249                 append('[');
 250                 if(var.array_size)
 251                         var.array_size->visit(*this);
 252                 append(']');
 253         }
 254         if(var.init_expression)
 255         {
 256                 append(" = ");
 257                 var.init_expression->visit(*this);
 258         }
 259         if(!parameter_list)
 260                 append(';');
 261 }
 262
 263 void Formatter::visit(InterfaceBlock &iface)
 264 {
 265         SetForScope<string> set(block_interface, iface.interface);
 266         append(format("%s %s\n", iface.interface, iface.name));
 267         iface.members.visit(*this);
 268         if(!iface.instance_name.empty())
 269         {
 270                 append(' ');
 271                 append(iface.instance_name);
 272                 if(iface.array)
 273                         append("[]");
 274         }
 275         append(';');
 276 }
 277
 278 void Formatter::visit(FunctionDeclaration &func)
 279 {
 280         append(format("%s %s(", func.return_type_declaration->name, func.name));
 281         for(NodeArray<VariableDeclaration>::iterator i=func.parameters.begin(); i!=func.parameters.end(); ++i)
 282         {
 283                 if(i!=func.parameters.begin())
 284                         append(", ");
 285                 SetFlag set(parameter_list);
 286                 (*i)->visit(*this);
 287         }
 288         append(')');
 289         if(func.definition==&func)
 290         {
 291                 append('\n');
 292                 func.body.visit(*this);
 293         }
 294         else
 295                 append(';');
 296 }
 297
 298 void Formatter::visit(Conditional &cond)
 299 {
 300         append("if(");
 301         cond.condition->visit(*this);
 302         append(")\n");
 303
 304         cond.body.visit(*this);
 305         if(!cond.else_body.body.empty())
 306         {
 307                 Conditional *else_cond = dynamic_cast<Conditional *>(cond.else_body.body.front().get());
 308                 if(cond.else_body.body.size()==1 && else_cond)
 309                 {
 310                         append('\n');
 311                         set_source(else_cond->source, else_cond->line);
 312                         append(format("%selse ", string(indent*2, ' ')));
 313                         else_cond->visit(*this);
 314                 }
 315                 else
 316                 {
 317                         append(format("\n%selse\n", string(indent*2, ' ')));
 318                         cond.else_body.visit(*this);
 319                 }
 320         }
 321 }
 322
 323 void Formatter::visit(Iteration &iter)
 324 {
 325         if(!iter.init_statement && iter.condition && !iter.loop_expression)
 326         {
 327                 append("while(");
 328                 iter.condition->visit(*this);
 329                 append(')');
 330         }
 331         else
 332         {
 333                 append("for(");
 334                 if(iter.init_statement)
 335                         iter.init_statement->visit(*this);
 336                 else
 337                         append(';');
 338                 if(iter.condition)
 339                 {
 340                         append(' ');
 341                         iter.condition->visit(*this);
 342                 }
 343                 append(';');
 344                 if(iter.loop_expression)
 345                 {
 346                         append(' ');
 347                         iter.loop_expression->visit(*this);
 348                 }
 349                 append(')');
 350         }
 351
 352         if(iter.body.body.empty())
 353                 append(" { }");
 354         else
 355         {
 356                 append('\n');
 357                 iter.body.visit(*this);
 358         }
 359 }
 360
 361 void Formatter::visit(Passthrough &pass)
 362 {
 363         append("passthrough");
 364         if(pass.subscript)
 365         {
 366                 append('[');
 367                 pass.subscript->visit(*this);
 368                 append(']');
 369         }
 370         append(';');
 371 }
 372
 373 void Formatter::visit(Return &ret)
 374 {
 375         append("return");
 376         if(ret.expression)
 377         {
 378                 append(' ');
 379                 ret.expression->visit(*this);
 380         }
 381         append(';');
 382 }
 383
 384 void Formatter::visit(Jump &jump)
 385 {
 386         append(jump.keyword);
 387         append(';');
 388 }
 389
 390 } // namespace SL
 391 } // namespace GL
 392 } // namespace Msp