blob: 08d88a9988df5e6bc39d82d8fd7490671d5e677b [file] [log] [blame]
* Copyright 2017 Google Inc.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
#include "SkSLGLSLCodeGenerator.h"
#include "SkSLSectionAndParameterHelper.h"
#include <set>
namespace SkSL {
class CPPCodeGenerator : public GLSLCodeGenerator {
CPPCodeGenerator(const Context* context, const Program* program, ErrorReporter* errors,
String name, OutputStream* out);
bool generateCode() override;
void writef(const char* s, va_list va) SKSL_PRINTF_LIKE(2, 0);
void writef(const char* s, ...) SKSL_PRINTF_LIKE(2, 3);
bool writeSection(const char* name, const char* prefix = "");
void writeHeader() override;
bool usesPrecisionModifiers() const override;
String getTypeName(const Type& type) override;
void writeBinaryExpression(const BinaryExpression& b, Precedence parentPrecedence) override;
void writeIndexExpression(const IndexExpression& i) override;
void writeIntLiteral(const IntLiteral& i) override;
void writeSwizzle(const Swizzle& swizzle) override;
void writeFieldAccess(const FieldAccess& access) override;
void writeVariableReference(const VariableReference& ref) override;
String getSamplerHandle(const Variable& var);
void writeIfStatement(const IfStatement& s) override;
void writeReturnStatement(const ReturnStatement& s) override;
void writeSwitchStatement(const SwitchStatement& s) override;
void writeFunctionCall(const FunctionCall& c) override;
void writeFunction(const FunctionDefinition& f) override;
void writeSetting(const Setting& s) override;
void writeProgramElement(const ProgramElement& p) override;
void addUniform(const Variable& var);
// writes a printf escape that will be filled in at runtime by the given C++ expression string
void writeRuntimeValue(const Type& type, const Layout& layout, const String& cppCode);
void writeVarInitializer(const Variable& var, const Expression& value) override;
void writeInputVars() override;
void writePrivateVars();
void writePrivateVarValues();
void writeCodeAppend(const String& code);
bool writeEmitCode(std::vector<const Variable*>& uniforms);
void writeSetData(std::vector<const Variable*>& uniforms);
void writeGetKey();
void writeOnTextureSampler();
void writeClone();
void writeTest();
// If the returned C++ is included in the generated code, then the variable name stored in
// cppVar will refer to a valid SkString that matches the Expression. Successful returns leave
// the output buffer (and related state) unmodified.
// In the simplest cases, this will return "SkString {cppVar}(\"{e}\");", while more advanced
// cases will properly insert format arguments.
String convertSKSLExpressionToCPP(const Expression& e, const String& cppVar);
// Process accumulated sksl to split it into appended code sections, properly interleaved with
// the extra emit code blocks, based on statement/block locations and the inserted tokens
// from newExtraEmitCodeBlock(). It is necessary to split the sksl after the program has been
// fully walked since many elements redirect fOut to simultaneously build header sections and
// bodies that are then concatenated; due to this it is not possible to split the sksl emission
// on the fly.
void flushEmittedCode();
// Start a new extra emit code block for accumulating C++ code. This will insert a token into
// the sksl stream to mark the fence between previous complete sksl statements and where the
// C++ code added to the new block will be added to emitCode(). These tokens are removed by
// flushEmittedCode() as it consumes them before passing pure sksl to writeCodeAppend().
void newExtraEmitCodeBlock();
// Append CPP code to the current extra emit code block.
void addExtraEmitCodeLine(const String& toAppend);
int getChildFPIndex(const VariableReference& reference) const;
String fName;
String fFullName;
SectionAndParameterHelper fSectionAndParameterHelper;
std::vector<String> fExtraEmitCodeBlocks;
std::vector<String> fFormatArgs;
std::set<int> fWrittenTransformedCoords;
// if true, we are writing a C++ expression instead of a GLSL expression
bool fCPPMode = false;
bool fInMain = false;
// if not null, we are accumulating SkSL for emitCode into fOut, which
// replaced the original buffer with a StringStream. The original buffer is
// stored here for restoration.
OutputStream* fCPPBuffer = nullptr;
typedef GLSLCodeGenerator INHERITED;