| /* |
| * Copyright 2016 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #include "SkSLMetalCodeGenerator.h" |
| |
| #include "SkSLCompiler.h" |
| #include "ir/SkSLExpressionStatement.h" |
| #include "ir/SkSLExtension.h" |
| #include "ir/SkSLIndexExpression.h" |
| #include "ir/SkSLModifiersDeclaration.h" |
| #include "ir/SkSLNop.h" |
| #include "ir/SkSLVariableReference.h" |
| |
| namespace SkSL { |
| |
| void MetalCodeGenerator::write(const char* s) { |
| if (!s[0]) { |
| return; |
| } |
| if (fAtLineStart) { |
| for (int i = 0; i < fIndentation; i++) { |
| fOut->writeText(" "); |
| } |
| } |
| fOut->writeText(s); |
| fAtLineStart = false; |
| } |
| |
| void MetalCodeGenerator::writeLine(const char* s) { |
| this->write(s); |
| fOut->writeText(fLineEnding); |
| fAtLineStart = true; |
| } |
| |
| void MetalCodeGenerator::write(const String& s) { |
| this->write(s.c_str()); |
| } |
| |
| void MetalCodeGenerator::writeLine(const String& s) { |
| this->writeLine(s.c_str()); |
| } |
| |
| void MetalCodeGenerator::writeLine() { |
| this->writeLine(""); |
| } |
| |
| void MetalCodeGenerator::writeExtension(const Extension& ext) { |
| this->writeLine("#extension " + ext.fName + " : enable"); |
| } |
| |
| void MetalCodeGenerator::writeType(const Type& type) { |
| switch (type.kind()) { |
| case Type::kStruct_Kind: |
| for (const Type* search : fWrittenStructs) { |
| if (*search == type) { |
| // already written |
| this->write(type.name()); |
| return; |
| } |
| } |
| fWrittenStructs.push_back(&type); |
| this->writeLine("struct " + type.name() + " {"); |
| fIndentation++; |
| for (const auto& f : type.fields()) { |
| this->writeModifiers(f.fModifiers, false); |
| // sizes (which must be static in structs) are part of the type name here |
| this->writeType(*f.fType); |
| this->writeLine(" " + f.fName + ";"); |
| } |
| fIndentation--; |
| this->write("}"); |
| break; |
| case Type::kVector_Kind: |
| this->writeType(type.componentType()); |
| this->write(to_string(type.columns())); |
| break; |
| default: |
| this->write(type.name()); |
| } |
| } |
| |
| void MetalCodeGenerator::writeExpression(const Expression& expr, Precedence parentPrecedence) { |
| switch (expr.fKind) { |
| case Expression::kBinary_Kind: |
| this->writeBinaryExpression((BinaryExpression&) expr, parentPrecedence); |
| break; |
| case Expression::kBoolLiteral_Kind: |
| this->writeBoolLiteral((BoolLiteral&) expr); |
| break; |
| case Expression::kConstructor_Kind: |
| this->writeConstructor((Constructor&) expr); |
| break; |
| case Expression::kIntLiteral_Kind: |
| this->writeIntLiteral((IntLiteral&) expr); |
| break; |
| case Expression::kFieldAccess_Kind: |
| this->writeFieldAccess(((FieldAccess&) expr)); |
| break; |
| case Expression::kFloatLiteral_Kind: |
| this->writeFloatLiteral(((FloatLiteral&) expr)); |
| break; |
| case Expression::kFunctionCall_Kind: |
| this->writeFunctionCall((FunctionCall&) expr); |
| break; |
| case Expression::kPrefix_Kind: |
| this->writePrefixExpression((PrefixExpression&) expr, parentPrecedence); |
| break; |
| case Expression::kPostfix_Kind: |
| this->writePostfixExpression((PostfixExpression&) expr, parentPrecedence); |
| break; |
| case Expression::kSetting_Kind: |
| this->writeSetting((Setting&) expr); |
| break; |
| case Expression::kSwizzle_Kind: |
| this->writeSwizzle((Swizzle&) expr); |
| break; |
| case Expression::kVariableReference_Kind: |
| this->writeVariableReference((VariableReference&) expr); |
| break; |
| case Expression::kTernary_Kind: |
| this->writeTernaryExpression((TernaryExpression&) expr, parentPrecedence); |
| break; |
| case Expression::kIndex_Kind: |
| this->writeIndexExpression((IndexExpression&) expr); |
| break; |
| default: |
| ABORT("unsupported expression: %s", expr.description().c_str()); |
| } |
| } |
| |
| void MetalCodeGenerator::writeFunctionCall(const FunctionCall& c) { |
| if (c.fFunction.fBuiltin && "atan" == c.fFunction.fName && 2 == c.fArguments.size()) { |
| this->write("atan2"); |
| } else { |
| this->write(c.fFunction.fName); |
| } |
| this->write("("); |
| const char* separator = ""; |
| if (this->requirements(c.fFunction) & kInputs_Requirement) { |
| this->write("_in"); |
| separator = ", "; |
| } |
| if (this->requirements(c.fFunction) & kOutputs_Requirement) { |
| this->write(separator); |
| this->write("_out"); |
| separator = ", "; |
| } |
| if (this->requirements(c.fFunction) & kUniforms_Requirement) { |
| this->write(separator); |
| this->write("_uniforms"); |
| separator = ", "; |
| } |
| for (size_t i = 0; i < c.fArguments.size(); ++i) { |
| const Expression& arg = *c.fArguments[i]; |
| this->write(separator); |
| separator = ", "; |
| if (c.fFunction.fParameters[i]->fModifiers.fFlags & Modifiers::kOut_Flag) { |
| this->write("&"); |
| } |
| this->writeExpression(arg, kSequence_Precedence); |
| } |
| this->write(")"); |
| } |
| |
| void MetalCodeGenerator::writeConstructor(const Constructor& c) { |
| this->writeType(c.fType); |
| this->write("("); |
| const char* separator = ""; |
| int scalarCount = 0; |
| for (const auto& arg : c.fArguments) { |
| this->write(separator); |
| separator = ", "; |
| if (Type::kMatrix_Kind == c.fType.kind() && Type::kScalar_Kind == arg->fType.kind()) { |
| // float2x2(float, float, float, float) doesn't work in Metal 1, so we need to merge to |
| // float2x2(float2, float2). |
| if (!scalarCount) { |
| this->writeType(c.fType.componentType()); |
| this->write(to_string(c.fType.rows())); |
| this->write("("); |
| } |
| ++scalarCount; |
| } |
| this->writeExpression(*arg, kSequence_Precedence); |
| if (scalarCount && scalarCount == c.fType.rows()) { |
| this->write(")"); |
| scalarCount = 0; |
| } |
| } |
| this->write(")"); |
| } |
| |
| void MetalCodeGenerator::writeFragCoord() { |
| this->write("_in.position"); |
| } |
| |
| void MetalCodeGenerator::writeVariableReference(const VariableReference& ref) { |
| switch (ref.fVariable.fModifiers.fLayout.fBuiltin) { |
| case SK_FRAGCOLOR_BUILTIN: |
| this->write("sk_FragColor"); |
| break; |
| default: |
| if (Variable::kGlobal_Storage == ref.fVariable.fStorage) { |
| if (ref.fVariable.fModifiers.fFlags & Modifiers::kIn_Flag) { |
| this->write("_in."); |
| } else if (ref.fVariable.fModifiers.fFlags & Modifiers::kOut_Flag) { |
| this->write("_out."); |
| } else if (ref.fVariable.fModifiers.fFlags & Modifiers::kUniform_Flag) { |
| this->write("_uniforms."); |
| } else { |
| fErrors.error(ref.fVariable.fOffset, "Metal backend does not support global " |
| "variables"); |
| } |
| } |
| this->write(ref.fVariable.fName); |
| } |
| } |
| |
| void MetalCodeGenerator::writeIndexExpression(const IndexExpression& expr) { |
| this->writeExpression(*expr.fBase, kPostfix_Precedence); |
| this->write("["); |
| this->writeExpression(*expr.fIndex, kTopLevel_Precedence); |
| this->write("]"); |
| } |
| |
| void MetalCodeGenerator::writeFieldAccess(const FieldAccess& f) { |
| if (FieldAccess::kDefault_OwnerKind == f.fOwnerKind) { |
| this->writeExpression(*f.fBase, kPostfix_Precedence); |
| this->write("."); |
| } |
| switch (f.fBase->fType.fields()[f.fFieldIndex].fModifiers.fLayout.fBuiltin) { |
| case SK_CLIPDISTANCE_BUILTIN: |
| this->write("gl_ClipDistance"); |
| break; |
| case SK_POSITION_BUILTIN: |
| this->write("_out.position"); |
| break; |
| default: |
| this->write(f.fBase->fType.fields()[f.fFieldIndex].fName); |
| } |
| } |
| |
| void MetalCodeGenerator::writeSwizzle(const Swizzle& swizzle) { |
| this->writeExpression(*swizzle.fBase, kPostfix_Precedence); |
| this->write("."); |
| for (int c : swizzle.fComponents) { |
| this->write(&("x\0y\0z\0w\0"[c * 2])); |
| } |
| } |
| |
| MetalCodeGenerator::Precedence MetalCodeGenerator::GetBinaryPrecedence(Token::Kind op) { |
| switch (op) { |
| case Token::STAR: // fall through |
| case Token::SLASH: // fall through |
| case Token::PERCENT: return MetalCodeGenerator::kMultiplicative_Precedence; |
| case Token::PLUS: // fall through |
| case Token::MINUS: return MetalCodeGenerator::kAdditive_Precedence; |
| case Token::SHL: // fall through |
| case Token::SHR: return MetalCodeGenerator::kShift_Precedence; |
| case Token::LT: // fall through |
| case Token::GT: // fall through |
| case Token::LTEQ: // fall through |
| case Token::GTEQ: return MetalCodeGenerator::kRelational_Precedence; |
| case Token::EQEQ: // fall through |
| case Token::NEQ: return MetalCodeGenerator::kEquality_Precedence; |
| case Token::BITWISEAND: return MetalCodeGenerator::kBitwiseAnd_Precedence; |
| case Token::BITWISEXOR: return MetalCodeGenerator::kBitwiseXor_Precedence; |
| case Token::BITWISEOR: return MetalCodeGenerator::kBitwiseOr_Precedence; |
| case Token::LOGICALAND: return MetalCodeGenerator::kLogicalAnd_Precedence; |
| case Token::LOGICALXOR: return MetalCodeGenerator::kLogicalXor_Precedence; |
| case Token::LOGICALOR: return MetalCodeGenerator::kLogicalOr_Precedence; |
| case Token::EQ: // fall through |
| case Token::PLUSEQ: // fall through |
| case Token::MINUSEQ: // fall through |
| case Token::STAREQ: // fall through |
| case Token::SLASHEQ: // fall through |
| case Token::PERCENTEQ: // fall through |
| case Token::SHLEQ: // fall through |
| case Token::SHREQ: // fall through |
| case Token::LOGICALANDEQ: // fall through |
| case Token::LOGICALXOREQ: // fall through |
| case Token::LOGICALOREQ: // fall through |
| case Token::BITWISEANDEQ: // fall through |
| case Token::BITWISEXOREQ: // fall through |
| case Token::BITWISEOREQ: return MetalCodeGenerator::kAssignment_Precedence; |
| case Token::COMMA: return MetalCodeGenerator::kSequence_Precedence; |
| default: ABORT("unsupported binary operator"); |
| } |
| } |
| |
| void MetalCodeGenerator::writeBinaryExpression(const BinaryExpression& b, |
| Precedence parentPrecedence) { |
| Precedence precedence = GetBinaryPrecedence(b.fOperator); |
| if (precedence >= parentPrecedence) { |
| this->write("("); |
| } |
| if (Compiler::IsAssignment(b.fOperator) && |
| Expression::kVariableReference_Kind == b.fLeft->fKind && |
| Variable::kParameter_Storage == ((VariableReference&) *b.fLeft).fVariable.fStorage && |
| (((VariableReference&) *b.fLeft).fVariable.fModifiers.fFlags & Modifiers::kOut_Flag)) { |
| // writing to an out parameter. Since we have to turn those into pointers, we have to |
| // dereference it here. |
| this->write("*"); |
| } |
| this->writeExpression(*b.fLeft, precedence); |
| if (b.fOperator != Token::EQ && Compiler::IsAssignment(b.fOperator) && |
| Expression::kSwizzle_Kind == b.fLeft->fKind && !b.fLeft->hasSideEffects()) { |
| // This doesn't compile in Metal: |
| // float4 x = float4(1); |
| // x.xy *= float2x2(...); |
| // with the error message "non-const reference cannot bind to vector element", |
| // but switching it to x.xy = x.xy * float2x2(...) fixes it. We perform this tranformation |
| // as long as the LHS has no side effects, and hope for the best otherwise. |
| this->write(" = "); |
| this->writeExpression(*b.fLeft, kAssignment_Precedence); |
| this->write(" "); |
| String op = Compiler::OperatorName(b.fOperator); |
| ASSERT(op.endsWith("=")); |
| this->write(op.substr(0, op.size() - 1).c_str()); |
| this->write(" "); |
| } else { |
| this->write(String(" ") + Compiler::OperatorName(b.fOperator) + " "); |
| } |
| this->writeExpression(*b.fRight, precedence); |
| if (precedence >= parentPrecedence) { |
| this->write(")"); |
| } |
| } |
| |
| void MetalCodeGenerator::writeTernaryExpression(const TernaryExpression& t, |
| Precedence parentPrecedence) { |
| if (kTernary_Precedence >= parentPrecedence) { |
| this->write("("); |
| } |
| this->writeExpression(*t.fTest, kTernary_Precedence); |
| this->write(" ? "); |
| this->writeExpression(*t.fIfTrue, kTernary_Precedence); |
| this->write(" : "); |
| this->writeExpression(*t.fIfFalse, kTernary_Precedence); |
| if (kTernary_Precedence >= parentPrecedence) { |
| this->write(")"); |
| } |
| } |
| |
| void MetalCodeGenerator::writePrefixExpression(const PrefixExpression& p, |
| Precedence parentPrecedence) { |
| if (kPrefix_Precedence >= parentPrecedence) { |
| this->write("("); |
| } |
| this->write(Compiler::OperatorName(p.fOperator)); |
| this->writeExpression(*p.fOperand, kPrefix_Precedence); |
| if (kPrefix_Precedence >= parentPrecedence) { |
| this->write(")"); |
| } |
| } |
| |
| void MetalCodeGenerator::writePostfixExpression(const PostfixExpression& p, |
| Precedence parentPrecedence) { |
| if (kPostfix_Precedence >= parentPrecedence) { |
| this->write("("); |
| } |
| this->writeExpression(*p.fOperand, kPostfix_Precedence); |
| this->write(Compiler::OperatorName(p.fOperator)); |
| if (kPostfix_Precedence >= parentPrecedence) { |
| this->write(")"); |
| } |
| } |
| |
| void MetalCodeGenerator::writeBoolLiteral(const BoolLiteral& b) { |
| this->write(b.fValue ? "true" : "false"); |
| } |
| |
| void MetalCodeGenerator::writeIntLiteral(const IntLiteral& i) { |
| if (i.fType == *fContext.fUInt_Type) { |
| this->write(to_string(i.fValue & 0xffffffff) + "u"); |
| } else { |
| this->write(to_string((int32_t) i.fValue)); |
| } |
| } |
| |
| void MetalCodeGenerator::writeFloatLiteral(const FloatLiteral& f) { |
| this->write(to_string(f.fValue)); |
| } |
| |
| void MetalCodeGenerator::writeSetting(const Setting& s) { |
| ABORT("internal error; setting was not folded to a constant during compilation\n"); |
| } |
| |
| void MetalCodeGenerator::writeFunction(const FunctionDefinition& f) { |
| const char* separator = ""; |
| if ("main" == f.fDeclaration.fName) { |
| switch (fProgram.fKind) { |
| case Program::kFragment_Kind: |
| this->write("fragment half4 _frag"); |
| break; |
| case Program::kVertex_Kind: |
| this->write("vertex Outputs _vert"); |
| break; |
| default: |
| ASSERT(false); |
| } |
| this->write("(Inputs _in [[stage_in]]"); |
| if (-1 != fUniformBuffer) { |
| this->write(", constant Uniforms& _uniforms [[buffer(" + |
| to_string(fUniformBuffer) + ")]]"); |
| } |
| separator = ", "; |
| } else { |
| this->writeType(f.fDeclaration.fReturnType); |
| this->write(" " + f.fDeclaration.fName + "("); |
| if (this->requirements(f.fDeclaration) & kInputs_Requirement) { |
| this->write("Inputs _in"); |
| separator = ", "; |
| } |
| if (this->requirements(f.fDeclaration) & kOutputs_Requirement) { |
| this->write(separator); |
| this->write("thread Outputs& _out"); |
| separator = ", "; |
| } |
| if (this->requirements(f.fDeclaration) & kUniforms_Requirement) { |
| this->write(separator); |
| this->write("Uniforms _uniforms"); |
| separator = ", "; |
| } |
| } |
| for (const auto& param : f.fDeclaration.fParameters) { |
| this->write(separator); |
| separator = ", "; |
| this->writeModifiers(param->fModifiers, false); |
| std::vector<int> sizes; |
| const Type* type = ¶m->fType; |
| while (Type::kArray_Kind == type->kind()) { |
| sizes.push_back(type->columns()); |
| type = &type->componentType(); |
| } |
| this->writeType(*type); |
| if (param->fModifiers.fFlags & Modifiers::kOut_Flag) { |
| this->write("*"); |
| } |
| this->write(" " + param->fName); |
| for (int s : sizes) { |
| if (s <= 0) { |
| this->write("[]"); |
| } else { |
| this->write("[" + to_string(s) + "]"); |
| } |
| } |
| } |
| this->writeLine(") {"); |
| |
| if ("main" == f.fDeclaration.fName) { |
| switch (fProgram.fKind) { |
| case Program::kFragment_Kind: |
| this->writeLine(" half4 sk_FragColor;"); |
| break; |
| case Program::kVertex_Kind: |
| this->writeLine(" Outputs _out;"); |
| break; |
| default: |
| ASSERT(false); |
| } |
| } |
| fFunctionHeader = ""; |
| OutputStream* oldOut = fOut; |
| StringStream buffer; |
| fOut = &buffer; |
| fIndentation++; |
| this->writeStatements(((Block&) *f.fBody).fStatements); |
| if ("main" == f.fDeclaration.fName) { |
| switch (fProgram.fKind) { |
| case Program::kFragment_Kind: |
| this->writeLine("return sk_FragColor;"); |
| break; |
| case Program::kVertex_Kind: |
| this->writeLine("return _out;"); |
| break; |
| default: |
| ASSERT(false); |
| } |
| } |
| fIndentation--; |
| this->writeLine("}"); |
| |
| fOut = oldOut; |
| this->write(fFunctionHeader); |
| this->write(buffer.str()); |
| } |
| |
| void MetalCodeGenerator::writeModifiers(const Modifiers& modifiers, |
| bool globalContext) { |
| if (modifiers.fFlags & Modifiers::kOut_Flag) { |
| this->write("thread "); |
| } |
| if (modifiers.fFlags & Modifiers::kConst_Flag) { |
| this->write("const "); |
| } |
| } |
| |
| void MetalCodeGenerator::writeInterfaceBlock(const InterfaceBlock& intf) { |
| if ("sk_PerVertex" == intf.fTypeName) { |
| return; |
| } |
| this->writeModifiers(intf.fVariable.fModifiers, true); |
| this->writeLine(intf.fTypeName + " {"); |
| fIndentation++; |
| const Type* structType = &intf.fVariable.fType; |
| while (Type::kArray_Kind == structType->kind()) { |
| structType = &structType->componentType(); |
| } |
| for (const auto& f : structType->fields()) { |
| this->writeModifiers(f.fModifiers, false); |
| this->writeType(*f.fType); |
| this->writeLine(" " + f.fName + ";"); |
| } |
| fIndentation--; |
| this->write("}"); |
| if (intf.fInstanceName.size()) { |
| this->write(" "); |
| this->write(intf.fInstanceName); |
| for (const auto& size : intf.fSizes) { |
| this->write("["); |
| if (size) { |
| this->writeExpression(*size, kTopLevel_Precedence); |
| } |
| this->write("]"); |
| } |
| } |
| this->writeLine(";"); |
| } |
| |
| void MetalCodeGenerator::writeVarInitializer(const Variable& var, const Expression& value) { |
| this->writeExpression(value, kTopLevel_Precedence); |
| } |
| |
| void MetalCodeGenerator::writeVarDeclarations(const VarDeclarations& decl, bool global) { |
| ASSERT(decl.fVars.size() > 0); |
| bool wroteType = false; |
| for (const auto& stmt : decl.fVars) { |
| VarDeclaration& var = (VarDeclaration&) *stmt; |
| if (var.fVar->fModifiers.fFlags & (Modifiers::kIn_Flag | Modifiers::kOut_Flag | |
| Modifiers::kUniform_Flag)) { |
| ASSERT(global); |
| continue; |
| } |
| if (wroteType) { |
| this->write(", "); |
| } else { |
| this->writeModifiers(var.fVar->fModifiers, global); |
| this->writeType(decl.fBaseType); |
| this->write(" "); |
| wroteType = true; |
| } |
| this->write(var.fVar->fName); |
| for (const auto& size : var.fSizes) { |
| this->write("["); |
| if (size) { |
| this->writeExpression(*size, kTopLevel_Precedence); |
| } |
| this->write("]"); |
| } |
| if (var.fValue) { |
| this->write(" = "); |
| this->writeVarInitializer(*var.fVar, *var.fValue); |
| } |
| if (!fFoundImageDecl && var.fVar->fType == *fContext.fImage2D_Type) { |
| if (fProgram.fSettings.fCaps->imageLoadStoreExtensionString()) { |
| fHeader.writeText("#extension "); |
| fHeader.writeText(fProgram.fSettings.fCaps->imageLoadStoreExtensionString()); |
| fHeader.writeText(" : require\n"); |
| } |
| fFoundImageDecl = true; |
| } |
| } |
| if (wroteType) { |
| this->write(";"); |
| } |
| } |
| |
| void MetalCodeGenerator::writeStatement(const Statement& s) { |
| switch (s.fKind) { |
| case Statement::kBlock_Kind: |
| this->writeBlock((Block&) s); |
| break; |
| case Statement::kExpression_Kind: |
| this->writeExpression(*((ExpressionStatement&) s).fExpression, kTopLevel_Precedence); |
| this->write(";"); |
| break; |
| case Statement::kReturn_Kind: |
| this->writeReturnStatement((ReturnStatement&) s); |
| break; |
| case Statement::kVarDeclarations_Kind: |
| this->writeVarDeclarations(*((VarDeclarationsStatement&) s).fDeclaration, false); |
| break; |
| case Statement::kIf_Kind: |
| this->writeIfStatement((IfStatement&) s); |
| break; |
| case Statement::kFor_Kind: |
| this->writeForStatement((ForStatement&) s); |
| break; |
| case Statement::kWhile_Kind: |
| this->writeWhileStatement((WhileStatement&) s); |
| break; |
| case Statement::kDo_Kind: |
| this->writeDoStatement((DoStatement&) s); |
| break; |
| case Statement::kSwitch_Kind: |
| this->writeSwitchStatement((SwitchStatement&) s); |
| break; |
| case Statement::kBreak_Kind: |
| this->write("break;"); |
| break; |
| case Statement::kContinue_Kind: |
| this->write("continue;"); |
| break; |
| case Statement::kDiscard_Kind: |
| this->write("discard;"); |
| break; |
| case Statement::kNop_Kind: |
| this->write(";"); |
| break; |
| default: |
| ABORT("unsupported statement: %s", s.description().c_str()); |
| } |
| } |
| |
| void MetalCodeGenerator::writeStatements(const std::vector<std::unique_ptr<Statement>>& statements) { |
| for (const auto& s : statements) { |
| if (!s->isEmpty()) { |
| this->writeStatement(*s); |
| this->writeLine(); |
| } |
| } |
| } |
| |
| void MetalCodeGenerator::writeBlock(const Block& b) { |
| this->writeLine("{"); |
| fIndentation++; |
| this->writeStatements(b.fStatements); |
| fIndentation--; |
| this->write("}"); |
| } |
| |
| void MetalCodeGenerator::writeIfStatement(const IfStatement& stmt) { |
| this->write("if ("); |
| this->writeExpression(*stmt.fTest, kTopLevel_Precedence); |
| this->write(") "); |
| this->writeStatement(*stmt.fIfTrue); |
| if (stmt.fIfFalse) { |
| this->write(" else "); |
| this->writeStatement(*stmt.fIfFalse); |
| } |
| } |
| |
| void MetalCodeGenerator::writeForStatement(const ForStatement& f) { |
| this->write("for ("); |
| if (f.fInitializer && !f.fInitializer->isEmpty()) { |
| this->writeStatement(*f.fInitializer); |
| } else { |
| this->write("; "); |
| } |
| if (f.fTest) { |
| this->writeExpression(*f.fTest, kTopLevel_Precedence); |
| } |
| this->write("; "); |
| if (f.fNext) { |
| this->writeExpression(*f.fNext, kTopLevel_Precedence); |
| } |
| this->write(") "); |
| this->writeStatement(*f.fStatement); |
| } |
| |
| void MetalCodeGenerator::writeWhileStatement(const WhileStatement& w) { |
| this->write("while ("); |
| this->writeExpression(*w.fTest, kTopLevel_Precedence); |
| this->write(") "); |
| this->writeStatement(*w.fStatement); |
| } |
| |
| void MetalCodeGenerator::writeDoStatement(const DoStatement& d) { |
| this->write("do "); |
| this->writeStatement(*d.fStatement); |
| this->write(" while ("); |
| this->writeExpression(*d.fTest, kTopLevel_Precedence); |
| this->write(");"); |
| } |
| |
| void MetalCodeGenerator::writeSwitchStatement(const SwitchStatement& s) { |
| this->write("switch ("); |
| this->writeExpression(*s.fValue, kTopLevel_Precedence); |
| this->writeLine(") {"); |
| fIndentation++; |
| for (const auto& c : s.fCases) { |
| if (c->fValue) { |
| this->write("case "); |
| this->writeExpression(*c->fValue, kTopLevel_Precedence); |
| this->writeLine(":"); |
| } else { |
| this->writeLine("default:"); |
| } |
| fIndentation++; |
| for (const auto& stmt : c->fStatements) { |
| this->writeStatement(*stmt); |
| this->writeLine(); |
| } |
| fIndentation--; |
| } |
| fIndentation--; |
| this->write("}"); |
| } |
| |
| void MetalCodeGenerator::writeReturnStatement(const ReturnStatement& r) { |
| this->write("return"); |
| if (r.fExpression) { |
| this->write(" "); |
| this->writeExpression(*r.fExpression, kTopLevel_Precedence); |
| } |
| this->write(";"); |
| } |
| |
| void MetalCodeGenerator::writeHeader() { |
| this->write("#include <metal_stdlib>\n"); |
| this->write("#include <simd/simd.h>\n"); |
| this->write("using namespace metal;\n"); |
| } |
| |
| void MetalCodeGenerator::writeUniformStruct() { |
| for (const auto& e : fProgram.fElements) { |
| if (ProgramElement::kVar_Kind == e->fKind) { |
| VarDeclarations& decls = (VarDeclarations&) *e; |
| if (!decls.fVars.size()) { |
| continue; |
| } |
| const Variable& first = *((VarDeclaration&) *decls.fVars[0]).fVar; |
| if (first.fModifiers.fFlags & Modifiers::kUniform_Flag) { |
| if (-1 == fUniformBuffer) { |
| this->write("struct Uniforms {\n"); |
| fUniformBuffer = first.fModifiers.fLayout.fSet; |
| if (-1 == fUniformBuffer) { |
| fErrors.error(decls.fOffset, "Metal uniforms must have 'layout(set=...)'"); |
| } |
| } else if (first.fModifiers.fLayout.fSet != fUniformBuffer) { |
| if (-1 == fUniformBuffer) { |
| fErrors.error(decls.fOffset, "Metal backend requires all uniforms to have " |
| "the same 'layout(set=...)'"); |
| } |
| } |
| this->write(" "); |
| this->writeType(first.fType); |
| this->write(" "); |
| for (const auto& stmt : decls.fVars) { |
| VarDeclaration& var = (VarDeclaration&) *stmt; |
| this->write(var.fVar->fName); |
| } |
| this->write(";\n"); |
| } |
| } |
| } |
| if (-1 != fUniformBuffer) { |
| this->write("};\n"); |
| } |
| } |
| |
| void MetalCodeGenerator::writeInputStruct() { |
| this->write("struct Inputs {\n"); |
| if (Program::kFragment_Kind == fProgram.fKind) { |
| this->write(" float4 position [[position]];\n"); |
| } |
| for (const auto& e : fProgram.fElements) { |
| if (ProgramElement::kVar_Kind == e->fKind) { |
| VarDeclarations& decls = (VarDeclarations&) *e; |
| if (!decls.fVars.size()) { |
| continue; |
| } |
| const Variable& first = *((VarDeclaration&) *decls.fVars[0]).fVar; |
| if (first.fModifiers.fFlags & Modifiers::kIn_Flag && |
| -1 == first.fModifiers.fLayout.fBuiltin) { |
| this->write(" "); |
| this->writeType(first.fType); |
| this->write(" "); |
| for (const auto& stmt : decls.fVars) { |
| VarDeclaration& var = (VarDeclaration&) *stmt; |
| this->write(var.fVar->fName); |
| if (-1 != var.fVar->fModifiers.fLayout.fLocation) { |
| this->write(" [[attribute(" + |
| to_string(var.fVar->fModifiers.fLayout.fLocation) + ")]]"); |
| } |
| } |
| this->write(";\n"); |
| } |
| } |
| } |
| this->write("};\n"); |
| } |
| |
| void MetalCodeGenerator::writeOutputStruct() { |
| this->write("struct Outputs {\n"); |
| this->write(" float4 position [[position]];\n"); |
| for (const auto& e : fProgram.fElements) { |
| if (ProgramElement::kVar_Kind == e->fKind) { |
| VarDeclarations& decls = (VarDeclarations&) *e; |
| if (!decls.fVars.size()) { |
| continue; |
| } |
| const Variable& first = *((VarDeclaration&) *decls.fVars[0]).fVar; |
| if (first.fModifiers.fFlags & Modifiers::kOut_Flag && |
| -1 == first.fModifiers.fLayout.fBuiltin) { |
| this->write(" "); |
| this->writeType(first.fType); |
| this->write(" "); |
| for (const auto& stmt : decls.fVars) { |
| VarDeclaration& var = (VarDeclaration&) *stmt; |
| this->write(var.fVar->fName); |
| } |
| this->write(";\n"); |
| } |
| } |
| } this->write("};\n"); |
| } |
| |
| void MetalCodeGenerator::writeProgramElement(const ProgramElement& e) { |
| switch (e.fKind) { |
| case ProgramElement::kExtension_Kind: |
| break; |
| case ProgramElement::kVar_Kind: { |
| VarDeclarations& decl = (VarDeclarations&) e; |
| if (decl.fVars.size() > 0) { |
| int builtin = ((VarDeclaration&) *decl.fVars[0]).fVar->fModifiers.fLayout.fBuiltin; |
| if (-1 == builtin) { |
| // normal var |
| this->writeVarDeclarations(decl, true); |
| this->writeLine(); |
| } else if (SK_FRAGCOLOR_BUILTIN == builtin) { |
| // ignore |
| } |
| } |
| break; |
| } |
| case ProgramElement::kInterfaceBlock_Kind: |
| this->writeInterfaceBlock((InterfaceBlock&) e); |
| break; |
| case ProgramElement::kFunction_Kind: |
| this->writeFunction((FunctionDefinition&) e); |
| break; |
| case ProgramElement::kModifiers_Kind: |
| this->writeModifiers(((ModifiersDeclaration&) e).fModifiers, true); |
| this->writeLine(";"); |
| break; |
| default: |
| printf("%s\n", e.description().c_str()); |
| ABORT("unsupported program element"); |
| } |
| } |
| |
| MetalCodeGenerator::Requirements MetalCodeGenerator::requirements(const Expression& e) { |
| switch (e.fKind) { |
| case Expression::kFunctionCall_Kind: { |
| const FunctionCall& f = (const FunctionCall&) e; |
| Requirements result = this->requirements(f.fFunction); |
| for (const auto& e : f.fArguments) { |
| result |= this->requirements(*e); |
| } |
| return result; |
| } |
| case Expression::kConstructor_Kind: { |
| const Constructor& c = (const Constructor&) e; |
| Requirements result = kNo_Requirements; |
| for (const auto& e : c.fArguments) { |
| result |= this->requirements(*e); |
| } |
| return result; |
| } |
| case Expression::kFieldAccess_Kind: |
| return this->requirements(*((const FieldAccess&) e).fBase); |
| case Expression::kSwizzle_Kind: |
| return this->requirements(*((const Swizzle&) e).fBase); |
| case Expression::kBinary_Kind: { |
| const BinaryExpression& b = (const BinaryExpression&) e; |
| return this->requirements(*b.fLeft) | this->requirements(*b.fRight); |
| } |
| case Expression::kIndex_Kind: { |
| const IndexExpression& idx = (const IndexExpression&) e; |
| return this->requirements(*idx.fBase) | this->requirements(*idx.fIndex); |
| } |
| case Expression::kPrefix_Kind: |
| return this->requirements(*((const PrefixExpression&) e).fOperand); |
| case Expression::kPostfix_Kind: |
| return this->requirements(*((const PostfixExpression&) e).fOperand); |
| case Expression::kTernary_Kind: { |
| const TernaryExpression& t = (const TernaryExpression&) e; |
| return this->requirements(*t.fTest) | this->requirements(*t.fIfTrue) | |
| this->requirements(*t.fIfFalse); |
| } |
| case Expression::kVariableReference_Kind: { |
| const VariableReference& v = (const VariableReference&) e; |
| Requirements result = kNo_Requirements; |
| if (v.fVariable.fModifiers.fLayout.fBuiltin == SK_FRAGCOORD_BUILTIN) { |
| result = kInputs_Requirement; |
| } else if (Variable::kGlobal_Storage == v.fVariable.fStorage) { |
| if (v.fVariable.fModifiers.fFlags & Modifiers::kIn_Flag) { |
| result = kInputs_Requirement; |
| } else if (v.fVariable.fModifiers.fFlags & Modifiers::kOut_Flag) { |
| result = kOutputs_Requirement; |
| } else if (v.fVariable.fModifiers.fFlags & Modifiers::kUniform_Flag) { |
| result = kUniforms_Requirement; |
| } |
| } |
| return result; |
| } |
| default: |
| return kNo_Requirements; |
| } |
| } |
| |
| MetalCodeGenerator::Requirements MetalCodeGenerator::requirements(const Statement& s) { |
| switch (s.fKind) { |
| case Statement::kBlock_Kind: { |
| Requirements result = kNo_Requirements; |
| for (const auto& child : ((const Block&) s).fStatements) { |
| result |= this->requirements(*child); |
| } |
| return result; |
| } |
| case Statement::kExpression_Kind: |
| return this->requirements(*((const ExpressionStatement&) s).fExpression); |
| case Statement::kReturn_Kind: { |
| const ReturnStatement& r = (const ReturnStatement&) s; |
| if (r.fExpression) { |
| return this->requirements(*r.fExpression); |
| } |
| return kNo_Requirements; |
| } |
| case Statement::kIf_Kind: { |
| const IfStatement& i = (const IfStatement&) s; |
| return this->requirements(*i.fTest) | |
| this->requirements(*i.fIfTrue) | |
| (i.fIfFalse && this->requirements(*i.fIfFalse)); |
| } |
| case Statement::kFor_Kind: { |
| const ForStatement& f = (const ForStatement&) s; |
| return this->requirements(*f.fInitializer) | |
| this->requirements(*f.fTest) | |
| this->requirements(*f.fNext) | |
| this->requirements(*f.fStatement); |
| } |
| case Statement::kWhile_Kind: { |
| const WhileStatement& w = (const WhileStatement&) s; |
| return this->requirements(*w.fTest) | |
| this->requirements(*w.fStatement); |
| } |
| case Statement::kDo_Kind: { |
| const DoStatement& d = (const DoStatement&) s; |
| return this->requirements(*d.fTest) | |
| this->requirements(*d.fStatement); |
| } |
| case Statement::kSwitch_Kind: { |
| const SwitchStatement& sw = (const SwitchStatement&) s; |
| Requirements result = this->requirements(*sw.fValue); |
| for (const auto& c : sw.fCases) { |
| for (const auto& st : c->fStatements) { |
| result |= this->requirements(*st); |
| } |
| } |
| return result; |
| } |
| default: |
| return kNo_Requirements; |
| } |
| } |
| |
| MetalCodeGenerator::Requirements MetalCodeGenerator::requirements(const FunctionDeclaration& f) { |
| if (f.fBuiltin) { |
| return kNo_Requirements; |
| } |
| auto found = fRequirements.find(&f); |
| if (found == fRequirements.end()) { |
| for (const auto& e : fProgram.fElements) { |
| if (ProgramElement::kFunction_Kind == e->fKind) { |
| const FunctionDefinition& def = (const FunctionDefinition&) *e; |
| if (&def.fDeclaration == &f) { |
| Requirements reqs = this->requirements(*def.fBody); |
| fRequirements[&f] = reqs; |
| return reqs; |
| } |
| } |
| } |
| } |
| return found->second; |
| } |
| |
| bool MetalCodeGenerator::generateCode() { |
| OutputStream* rawOut = fOut; |
| fOut = &fHeader; |
| fProgramKind = fProgram.fKind; |
| this->writeHeader(); |
| this->writeUniformStruct(); |
| this->writeInputStruct(); |
| if (Program::kVertex_Kind == fProgram.fKind) { |
| this->writeOutputStruct(); |
| } |
| StringStream body; |
| fOut = &body; |
| for (const auto& e : fProgram.fElements) { |
| this->writeProgramElement(*e); |
| } |
| fOut = rawOut; |
| |
| write_stringstream(fHeader, *rawOut); |
| write_stringstream(body, *rawOut); |
| return true; |
| } |
| |
| } |
