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* 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 "include/sksl/SkSLOperator.h"
#include "src/sksl/SkSLContext.h"
#include "src/sksl/SkSLStringStream.h"
#include "src/sksl/codegen/SkSLCodeGenerator.h"
#include <set>
#include <string>
#include <string_view>
namespace SkSL {
class AnyConstructor;
class BinaryExpression;
class Block;
class ConstructorDiagonalMatrix;
class DoStatement;
class Expression;
class ExpressionStatement;
class FieldAccess;
class ForStatement;
class FunctionCall;
class FunctionDeclaration;
class FunctionDefinition;
class FunctionPrototype;
class IfStatement;
class InterfaceBlock;
class Literal;
class OutputStream;
class PostfixExpression;
class PrefixExpression;
class ProgramElement;
class ReturnStatement;
class Setting;
class Statement;
class StructDefinition;
class SwitchStatement;
class TernaryExpression;
class Type;
class VarDeclaration;
class Variable;
class VariableReference;
struct IndexExpression;
struct Layout;
struct Modifiers;
struct Program;
struct ShaderCaps;
struct Swizzle;
* Converts a Program into GLSL code.
class GLSLCodeGenerator : public CodeGenerator {
GLSLCodeGenerator(const Context* context, const Program* program, OutputStream* out)
: INHERITED(context, program, out) {}
bool generateCode() override;
using Precedence = Operator::Precedence;
void write(std::string_view s);
void writeLine(std::string_view s = std::string_view());
void finishLine();
virtual void writeHeader();
bool usesPrecisionModifiers() const;
virtual std::string getTypeName(const Type& type);
void writeStructDefinition(const StructDefinition& s);
void writeType(const Type& type);
void writeExtension(std::string_view name, bool require = true);
void writeInterfaceBlock(const InterfaceBlock& intf);
void writeFunctionDeclaration(const FunctionDeclaration& f);
void writeFunctionPrototype(const FunctionPrototype& f);
virtual void writeFunction(const FunctionDefinition& f);
void writeLayout(const Layout& layout);
void writeModifiers(const Modifiers& modifiers, bool globalContext);
virtual void writeInputVars();
virtual void writeVarInitializer(const Variable& var, const Expression& value);
const char* getTypePrecision(const Type& type);
void writeTypePrecision(const Type& type);
void writeVarDeclaration(const VarDeclaration& var, bool global);
void writeFragCoord();
virtual void writeVariableReference(const VariableReference& ref);
void writeExpression(const Expression& expr, Precedence parentPrecedence);
void writeIntrinsicCall(const FunctionCall& c);
void writeMinAbsHack(Expression& absExpr, Expression& otherExpr);
void writeDeterminantHack(const Expression& mat);
void writeInverseHack(const Expression& mat);
void writeTransposeHack(const Expression& mat);
void writeInverseSqrtHack(const Expression& x);
void writeMatrixComparisonWorkaround(const BinaryExpression& x);
virtual void writeFunctionCall(const FunctionCall& c);
void writeConstructorDiagonalMatrix(const ConstructorDiagonalMatrix& c,
Precedence parentPrecedence);
virtual void writeAnyConstructor(const AnyConstructor& c, Precedence parentPrecedence);
virtual void writeCastConstructor(const AnyConstructor& c, Precedence parentPrecedence);
virtual void writeFieldAccess(const FieldAccess& f);
virtual void writeSwizzle(const Swizzle& swizzle);
virtual void writeBinaryExpression(const BinaryExpression& b, Precedence parentPrecedence);
void writeShortCircuitWorkaroundExpression(const BinaryExpression& b,
Precedence parentPrecedence);
virtual void writeTernaryExpression(const TernaryExpression& t, Precedence parentPrecedence);
virtual void writeIndexExpression(const IndexExpression& expr);
void writePrefixExpression(const PrefixExpression& p, Precedence parentPrecedence);
void writePostfixExpression(const PostfixExpression& p, Precedence parentPrecedence);
virtual void writeLiteral(const Literal& l);
virtual void writeSetting(const Setting& s);
void writeStatement(const Statement& s);
void writeBlock(const Block& b);
virtual void writeIfStatement(const IfStatement& stmt);
void writeForStatement(const ForStatement& f);
void writeDoStatement(const DoStatement& d);
void writeExpressionStatement(const ExpressionStatement& s);
virtual void writeSwitchStatement(const SwitchStatement& s);
virtual void writeReturnStatement(const ReturnStatement& r);
virtual void writeProgramElement(const ProgramElement& e);
const ShaderCaps& caps() const { return fContext.fCaps; }
StringStream fExtensions;
StringStream fGlobals;
StringStream fExtraFunctions;
std::string fFunctionHeader;
int fVarCount = 0;
int fIndentation = 0;
bool fAtLineStart = false;
std::set<std::string> fWrittenIntrinsics;
// true if we have run into usages of dFdx / dFdy
bool fFoundDerivatives = false;
bool fFoundExternalSamplerDecl = false;
bool fFoundRectSamplerDecl = false;
bool fSetupClockwise = false;
bool fSetupFragPosition = false;
bool fSetupFragCoordWorkaround = false;
using INHERITED = CodeGenerator;
} // namespace SkSL