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| 1 /* |
| 2 * Copyright 2016 Google Inc. |
| 3 * |
| 4 * Use of this source code is governed by a BSD-style license that can be |
| 5 * found in the LICENSE file. |
| 6 */ |
| 7 |
| 8 #include "SkSLGLSLCodeGenerator.h" |
| 9 |
| 10 #include "string.h" |
| 11 |
| 12 #include "GLSL.std.450.h" |
| 13 |
| 14 #include "ir/SkSLExpressionStatement.h" |
| 15 #include "ir/SkSLExtension.h" |
| 16 #include "ir/SkSLIndexExpression.h" |
| 17 #include "ir/SkSLVariableReference.h" |
| 18 |
| 19 namespace SkSL { |
| 20 |
| 21 void GLSLCodeGenerator::write(const char* s) { |
| 22 if (s[0] == 0) { |
| 23 return; |
| 24 } |
| 25 if (fAtLineStart) { |
| 26 for (int i = 0; i < fIndentation; i++) { |
| 27 *fOut << " "; |
| 28 } |
| 29 } |
| 30 *fOut << s; |
| 31 fAtLineStart = false; |
| 32 } |
| 33 |
| 34 void GLSLCodeGenerator::writeLine(const char* s) { |
| 35 this->write(s); |
| 36 *fOut << "\n"; |
| 37 fAtLineStart = true; |
| 38 } |
| 39 |
| 40 void GLSLCodeGenerator::write(const std::string& s) { |
| 41 this->write(s.c_str()); |
| 42 } |
| 43 |
| 44 void GLSLCodeGenerator::writeLine(const std::string& s) { |
| 45 this->writeLine(s.c_str()); |
| 46 } |
| 47 |
| 48 void GLSLCodeGenerator::writeLine() { |
| 49 this->writeLine(""); |
| 50 } |
| 51 |
| 52 void GLSLCodeGenerator::writeExtension(const Extension& ext) { |
| 53 this->writeLine("#extension " + ext.fName + " : enable"); |
| 54 } |
| 55 |
| 56 void GLSLCodeGenerator::writeType(const Type& type) { |
| 57 if (type.kind() == Type::kStruct_Kind) { |
| 58 for (const Type* search : fWrittenStructs) { |
| 59 if (*search == type) { |
| 60 // already written |
| 61 this->write(type.name()); |
| 62 return; |
| 63 } |
| 64 } |
| 65 fWrittenStructs.push_back(&type); |
| 66 this->writeLine("struct " + type.name() + " {"); |
| 67 fIndentation++; |
| 68 for (const auto& f : type.fields()) { |
| 69 this->writeModifiers(f.fModifiers); |
| 70 // sizes (which must be static in structs) are part of the type name
here |
| 71 this->writeType(f.fType); |
| 72 this->writeLine(" " + f.fName + ";"); |
| 73 } |
| 74 fIndentation--; |
| 75 this->writeLine("}"); |
| 76 } else { |
| 77 this->write(type.name()); |
| 78 } |
| 79 } |
| 80 |
| 81 void GLSLCodeGenerator::writeExpression(const Expression& expr, Precedence paren
tPrecedence) { |
| 82 switch (expr.fKind) { |
| 83 case Expression::kBinary_Kind: |
| 84 this->writeBinaryExpression((BinaryExpression&) expr, parentPreceden
ce); |
| 85 break; |
| 86 case Expression::kBoolLiteral_Kind: |
| 87 this->writeBoolLiteral((BoolLiteral&) expr); |
| 88 break; |
| 89 case Expression::kConstructor_Kind: |
| 90 this->writeConstructor((Constructor&) expr); |
| 91 break; |
| 92 case Expression::kIntLiteral_Kind: |
| 93 this->writeIntLiteral((IntLiteral&) expr); |
| 94 break; |
| 95 case Expression::kFieldAccess_Kind: |
| 96 this->writeFieldAccess(((FieldAccess&) expr)); |
| 97 break; |
| 98 case Expression::kFloatLiteral_Kind: |
| 99 this->writeFloatLiteral(((FloatLiteral&) expr)); |
| 100 break; |
| 101 case Expression::kFunctionCall_Kind: |
| 102 this->writeFunctionCall((FunctionCall&) expr); |
| 103 break; |
| 104 case Expression::kPrefix_Kind: |
| 105 this->writePrefixExpression((PrefixExpression&) expr, parentPreceden
ce); |
| 106 break; |
| 107 case Expression::kPostfix_Kind: |
| 108 this->writePostfixExpression((PostfixExpression&) expr, parentPreced
ence); |
| 109 break; |
| 110 case Expression::kSwizzle_Kind: |
| 111 this->writeSwizzle((Swizzle&) expr); |
| 112 break; |
| 113 case Expression::kVariableReference_Kind: |
| 114 this->writeVariableReference((VariableReference&) expr); |
| 115 break; |
| 116 case Expression::kTernary_Kind: |
| 117 this->writeTernaryExpression((TernaryExpression&) expr, parentPreced
ence); |
| 118 break; |
| 119 case Expression::kIndex_Kind: |
| 120 this->writeIndexExpression((IndexExpression&) expr); |
| 121 break; |
| 122 default: |
| 123 ABORT("unsupported expression: %s", expr.description().c_str()); |
| 124 } |
| 125 } |
| 126 |
| 127 void GLSLCodeGenerator::writeFunctionCall(const FunctionCall& c) { |
| 128 this->write(c.fFunction.fName + "("); |
| 129 const char* separator = ""; |
| 130 for (const auto& arg : c.fArguments) { |
| 131 this->write(separator); |
| 132 separator = ", "; |
| 133 this->writeExpression(*arg, kSequence_Precedence); |
| 134 } |
| 135 this->write(")"); |
| 136 } |
| 137 |
| 138 void GLSLCodeGenerator::writeConstructor(const Constructor& c) { |
| 139 this->write(c.fType.name() + "("); |
| 140 const char* separator = ""; |
| 141 for (const auto& arg : c.fArguments) { |
| 142 this->write(separator); |
| 143 separator = ", "; |
| 144 this->writeExpression(*arg, kSequence_Precedence); |
| 145 } |
| 146 this->write(")"); |
| 147 } |
| 148 |
| 149 void GLSLCodeGenerator::writeVariableReference(const VariableReference& ref) { |
| 150 this->write(ref.fVariable.fName); |
| 151 } |
| 152 |
| 153 void GLSLCodeGenerator::writeIndexExpression(const IndexExpression& expr) { |
| 154 this->writeExpression(*expr.fBase, kPostfix_Precedence); |
| 155 this->write("["); |
| 156 this->writeExpression(*expr.fIndex, kTopLevel_Precedence); |
| 157 this->write("]"); |
| 158 } |
| 159 |
| 160 void GLSLCodeGenerator::writeFieldAccess(const FieldAccess& f) { |
| 161 if (f.fOwnerKind == FieldAccess::kDefault_OwnerKind) { |
| 162 this->writeExpression(*f.fBase, kPostfix_Precedence); |
| 163 this->write("."); |
| 164 } |
| 165 this->write(f.fBase->fType.fields()[f.fFieldIndex].fName); |
| 166 } |
| 167 |
| 168 void GLSLCodeGenerator::writeSwizzle(const Swizzle& swizzle) { |
| 169 this->writeExpression(*swizzle.fBase, kPostfix_Precedence); |
| 170 this->write("."); |
| 171 for (int c : swizzle.fComponents) { |
| 172 this->write(&("x\0y\0z\0w\0"[c * 2])); |
| 173 } |
| 174 } |
| 175 |
| 176 static GLSLCodeGenerator::Precedence get_binary_precedence(Token::Kind op) { |
| 177 switch (op) { |
| 178 case Token::STAR: // fall through |
| 179 case Token::SLASH: // fall through |
| 180 case Token::PERCENT: return GLSLCodeGenerator::kMultiplicative_Prec
edence; |
| 181 case Token::PLUS: // fall through |
| 182 case Token::MINUS: return GLSLCodeGenerator::kAdditive_Precedence
; |
| 183 case Token::SHL: // fall through |
| 184 case Token::SHR: return GLSLCodeGenerator::kShift_Precedence; |
| 185 case Token::LT: // fall through |
| 186 case Token::GT: // fall through |
| 187 case Token::LTEQ: // fall through |
| 188 case Token::GTEQ: return GLSLCodeGenerator::kRelational_Preceden
ce; |
| 189 case Token::EQEQ: // fall through |
| 190 case Token::NEQ: return GLSLCodeGenerator::kEquality_Precedence
; |
| 191 case Token::BITWISEAND: return GLSLCodeGenerator::kBitwiseAnd_Preceden
ce; |
| 192 case Token::BITWISEXOR: return GLSLCodeGenerator::kBitwiseXor_Preceden
ce; |
| 193 case Token::BITWISEOR: return GLSLCodeGenerator::kBitwiseOr_Precedenc
e; |
| 194 case Token::LOGICALAND: return GLSLCodeGenerator::kLogicalAnd_Preceden
ce; |
| 195 case Token::LOGICALXOR: return GLSLCodeGenerator::kLogicalXor_Preceden
ce; |
| 196 case Token::LOGICALOR: return GLSLCodeGenerator::kLogicalOr_Precedenc
e; |
| 197 case Token::EQ: // fall through |
| 198 case Token::PLUSEQ: // fall through |
| 199 case Token::MINUSEQ: // fall through |
| 200 case Token::STAREQ: // fall through |
| 201 case Token::SLASHEQ: // fall through |
| 202 case Token::PERCENTEQ: // fall through |
| 203 case Token::SHLEQ: // fall through |
| 204 case Token::SHREQ: // fall through |
| 205 case Token::LOGICALANDEQ: // fall through |
| 206 case Token::LOGICALXOREQ: // fall through |
| 207 case Token::LOGICALOREQ: // fall through |
| 208 case Token::BITWISEANDEQ: // fall through |
| 209 case Token::BITWISEXOREQ: // fall through |
| 210 case Token::BITWISEOREQ: return GLSLCodeGenerator::kAssignment_Preceden
ce; |
| 211 default: ABORT("unsupported binary operator"); |
| 212 } |
| 213 } |
| 214 |
| 215 void GLSLCodeGenerator::writeBinaryExpression(const BinaryExpression& b, |
| 216 Precedence parentPrecedence) { |
| 217 Precedence precedence = get_binary_precedence(b.fOperator); |
| 218 if (precedence >= parentPrecedence) { |
| 219 this->write("("); |
| 220 } |
| 221 this->writeExpression(*b.fLeft, precedence); |
| 222 this->write(" " + Token::OperatorName(b.fOperator) + " "); |
| 223 this->writeExpression(*b.fRight, precedence); |
| 224 if (precedence >= parentPrecedence) { |
| 225 this->write(")"); |
| 226 } |
| 227 } |
| 228 |
| 229 void GLSLCodeGenerator::writeTernaryExpression(const TernaryExpression& t, |
| 230 Precedence parentPrecedence) { |
| 231 if (kTernary_Precedence >= parentPrecedence) { |
| 232 this->write("("); |
| 233 } |
| 234 this->writeExpression(*t.fTest, kTernary_Precedence); |
| 235 this->write(" ? "); |
| 236 this->writeExpression(*t.fIfTrue, kTernary_Precedence); |
| 237 this->write(" : "); |
| 238 this->writeExpression(*t.fIfFalse, kTernary_Precedence); |
| 239 if (kTernary_Precedence >= parentPrecedence) { |
| 240 this->write(")"); |
| 241 } |
| 242 } |
| 243 |
| 244 void GLSLCodeGenerator::writePrefixExpression(const PrefixExpression& p, |
| 245 Precedence parentPrecedence) { |
| 246 if (kPrefix_Precedence >= parentPrecedence) { |
| 247 this->write("("); |
| 248 } |
| 249 this->write(Token::OperatorName(p.fOperator)); |
| 250 this->writeExpression(*p.fOperand, kPrefix_Precedence); |
| 251 if (kPrefix_Precedence >= parentPrecedence) { |
| 252 this->write(")"); |
| 253 } |
| 254 } |
| 255 |
| 256 void GLSLCodeGenerator::writePostfixExpression(const PostfixExpression& p, |
| 257 Precedence parentPrecedence) { |
| 258 if (kPostfix_Precedence >= parentPrecedence) { |
| 259 this->write("("); |
| 260 } |
| 261 this->writeExpression(*p.fOperand, kPostfix_Precedence); |
| 262 this->write(Token::OperatorName(p.fOperator)); |
| 263 if (kPostfix_Precedence >= parentPrecedence) { |
| 264 this->write(")"); |
| 265 } |
| 266 } |
| 267 |
| 268 void GLSLCodeGenerator::writeBoolLiteral(const BoolLiteral& b) { |
| 269 this->write(b.fValue ? "true" : "false"); |
| 270 } |
| 271 |
| 272 void GLSLCodeGenerator::writeIntLiteral(const IntLiteral& i) { |
| 273 this->write(to_string(i.fValue)); |
| 274 } |
| 275 |
| 276 void GLSLCodeGenerator::writeFloatLiteral(const FloatLiteral& f) { |
| 277 this->write(to_string(f.fValue)); |
| 278 } |
| 279 |
| 280 void GLSLCodeGenerator::writeFunction(const FunctionDefinition& f) { |
| 281 this->writeType(f.fDeclaration.fReturnType); |
| 282 this->write(" " + f.fDeclaration.fName + "("); |
| 283 const char* separator = ""; |
| 284 for (const auto& param : f.fDeclaration.fParameters) { |
| 285 this->write(separator); |
| 286 separator = ", "; |
| 287 this->writeModifiers(param->fModifiers); |
| 288 this->writeType(param->fType); |
| 289 this->write(" " + param->fName); |
| 290 } |
| 291 this->write(") "); |
| 292 this->writeBlock(*f.fBody); |
| 293 this->writeLine(); |
| 294 } |
| 295 |
| 296 void GLSLCodeGenerator::writeModifiers(const Modifiers& modifiers) { |
| 297 this->write(modifiers.description()); |
| 298 } |
| 299 |
| 300 void GLSLCodeGenerator::writeInterfaceBlock(const InterfaceBlock& intf) { |
| 301 if (intf.fVariable.fName == "gl_PerVertex") { |
| 302 return; |
| 303 } |
| 304 this->writeModifiers(intf.fVariable.fModifiers); |
| 305 this->writeLine(intf.fVariable.fType.name() + " {"); |
| 306 fIndentation++; |
| 307 for (const auto& f : intf.fVariable.fType.fields()) { |
| 308 this->writeModifiers(f.fModifiers); |
| 309 this->writeType(f.fType); |
| 310 this->writeLine(" " + f.fName + ";"); |
| 311 } |
| 312 fIndentation--; |
| 313 this->writeLine("};"); |
| 314 } |
| 315 |
| 316 void GLSLCodeGenerator::writeVarDeclaration(const VarDeclaration& decl) { |
| 317 ASSERT(decl.fVars.size() > 0); |
| 318 this->writeModifiers(decl.fVars[0]->fModifiers); |
| 319 this->writeType(decl.fBaseType); |
| 320 std::string separator = " "; |
| 321 for (size_t i = 0; i < decl.fVars.size(); i++) { |
| 322 ASSERT(decl.fVars[i]->fModifiers == decl.fVars[0]->fModifiers); |
| 323 this->write(separator); |
| 324 separator = ", "; |
| 325 this->write(decl.fVars[i]->fName); |
| 326 for (const auto& size : decl.fSizes[i]) { |
| 327 this->write("["); |
| 328 this->writeExpression(*size, kTopLevel_Precedence); |
| 329 this->write("]"); |
| 330 } |
| 331 if (decl.fValues[i]) { |
| 332 this->write(" = "); |
| 333 this->writeExpression(*decl.fValues[i], kTopLevel_Precedence); |
| 334 } |
| 335 } |
| 336 this->write(";"); |
| 337 } |
| 338 |
| 339 void GLSLCodeGenerator::writeStatement(const Statement& s) { |
| 340 switch (s.fKind) { |
| 341 case Statement::kBlock_Kind: |
| 342 this->writeBlock((Block&) s); |
| 343 break; |
| 344 case Statement::kExpression_Kind: |
| 345 this->writeExpression(*((ExpressionStatement&) s).fExpression, kTopL
evel_Precedence); |
| 346 this->write(";"); |
| 347 break; |
| 348 case Statement::kReturn_Kind: |
| 349 this->writeReturnStatement((ReturnStatement&) s); |
| 350 break; |
| 351 case Statement::kVarDeclaration_Kind: |
| 352 this->writeVarDeclaration(*((VarDeclarationStatement&) s).fDeclarati
on); |
| 353 break; |
| 354 case Statement::kIf_Kind: |
| 355 this->writeIfStatement((IfStatement&) s); |
| 356 break; |
| 357 case Statement::kFor_Kind: |
| 358 this->writeForStatement((ForStatement&) s); |
| 359 break; |
| 360 case Statement::kWhile_Kind: |
| 361 this->writeWhileStatement((WhileStatement&) s); |
| 362 break; |
| 363 case Statement::kDo_Kind: |
| 364 this->writeDoStatement((DoStatement&) s); |
| 365 break; |
| 366 case Statement::kBreak_Kind: |
| 367 this->write("break;"); |
| 368 break; |
| 369 case Statement::kContinue_Kind: |
| 370 this->write("continue;"); |
| 371 break; |
| 372 case Statement::kDiscard_Kind: |
| 373 this->write("discard;"); |
| 374 break; |
| 375 default: |
| 376 ABORT("unsupported statement: %s", s.description().c_str()); |
| 377 } |
| 378 } |
| 379 |
| 380 void GLSLCodeGenerator::writeBlock(const Block& b) { |
| 381 this->writeLine("{"); |
| 382 fIndentation++; |
| 383 for (const auto& s : b.fStatements) { |
| 384 this->writeStatement(*s); |
| 385 this->writeLine(); |
| 386 } |
| 387 fIndentation--; |
| 388 this->write("}"); |
| 389 } |
| 390 |
| 391 void GLSLCodeGenerator::writeIfStatement(const IfStatement& stmt) { |
| 392 this->write("if ("); |
| 393 this->writeExpression(*stmt.fTest, kTopLevel_Precedence); |
| 394 this->write(") "); |
| 395 this->writeStatement(*stmt.fIfTrue); |
| 396 if (stmt.fIfFalse) { |
| 397 this->write(" else "); |
| 398 this->writeStatement(*stmt.fIfFalse); |
| 399 } |
| 400 } |
| 401 |
| 402 void GLSLCodeGenerator::writeForStatement(const ForStatement& f) { |
| 403 this->write("for ("); |
| 404 if (f.fInitializer) { |
| 405 this->writeStatement(*f.fInitializer); |
| 406 } else { |
| 407 this->write("; "); |
| 408 } |
| 409 if (f.fTest) { |
| 410 this->writeExpression(*f.fTest, kTopLevel_Precedence); |
| 411 } |
| 412 this->write("; "); |
| 413 if (f.fNext) { |
| 414 this->writeExpression(*f.fNext, kTopLevel_Precedence); |
| 415 } |
| 416 this->write(") "); |
| 417 this->writeStatement(*f.fStatement); |
| 418 } |
| 419 |
| 420 void GLSLCodeGenerator::writeWhileStatement(const WhileStatement& w) { |
| 421 this->write("while ("); |
| 422 this->writeExpression(*w.fTest, kTopLevel_Precedence); |
| 423 this->write(") "); |
| 424 this->writeStatement(*w.fStatement); |
| 425 } |
| 426 |
| 427 void GLSLCodeGenerator::writeDoStatement(const DoStatement& d) { |
| 428 this->write("do "); |
| 429 this->writeStatement(*d.fStatement); |
| 430 this->write(" while ("); |
| 431 this->writeExpression(*d.fTest, kTopLevel_Precedence); |
| 432 this->write(");"); |
| 433 } |
| 434 |
| 435 void GLSLCodeGenerator::writeReturnStatement(const ReturnStatement& r) { |
| 436 this->write("return"); |
| 437 if (r.fExpression) { |
| 438 this->write(" "); |
| 439 this->writeExpression(*r.fExpression, kTopLevel_Precedence); |
| 440 } |
| 441 this->write(";"); |
| 442 } |
| 443 |
| 444 void GLSLCodeGenerator::generateCode(const Program& program, std::ostream& out)
{ |
| 445 ASSERT(fOut == nullptr); |
| 446 fOut = &out; |
| 447 this->write("#version " + to_string(fCaps.fVersion)); |
| 448 if (fCaps.fStandard == GLCaps::kGLES_Standard) { |
| 449 this->write(" es"); |
| 450 } |
| 451 this->writeLine(); |
| 452 for (const auto& e : program.fElements) { |
| 453 switch (e->fKind) { |
| 454 case ProgramElement::kExtension_Kind: |
| 455 this->writeExtension((Extension&) *e); |
| 456 break; |
| 457 case ProgramElement::kVar_Kind: { |
| 458 VarDeclaration& decl = (VarDeclaration&) *e; |
| 459 if (decl.fVars.size() > 0 && decl.fVars[0]->fModifiers.fLayout.f
Builtin == -1) { |
| 460 this->writeVarDeclaration(decl); |
| 461 this->writeLine(); |
| 462 } |
| 463 break; |
| 464 } |
| 465 case ProgramElement::kInterfaceBlock_Kind: |
| 466 this->writeInterfaceBlock((InterfaceBlock&) *e); |
| 467 break; |
| 468 case ProgramElement::kFunction_Kind: |
| 469 this->writeFunction((FunctionDefinition&) *e); |
| 470 break; |
| 471 default: |
| 472 printf("%s\n", e->description().c_str()); |
| 473 ABORT("unsupported program element"); |
| 474 } |
| 475 } |
| 476 fOut = nullptr; |
| 477 } |
| 478 |
| 479 } |
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Chromium Code Reviews
Issue 2185393003:
added initial GLSL support to skslc (Closed)
Base URL: https://skia.googlesource.com/skia.git@master