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/*
* Copyright 2018 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkSLPipelineStageCodeGenerator.h"
#include "SkSLCompiler.h"
#include "SkSLHCodeGenerator.h"
namespace SkSL {
PipelineStageCodeGenerator::PipelineStageCodeGenerator(
const Context* context,
const Program* program,
ErrorReporter* errors,
OutputStream* out,
std::vector<Compiler::FormatArg>* outFormatArgs)
: INHERITED(context, program, errors, out)
, fName("Temp")
, fFullName(String::printf("Gr%s", fName.c_str()))
, fSectionAndParameterHelper(*program, *errors)
, fFormatArgs(outFormatArgs) {}
void PipelineStageCodeGenerator::writef(const char* s, va_list va) {
static constexpr int BUFFER_SIZE = 1024;
va_list copy;
va_copy(copy, va);
char buffer[BUFFER_SIZE];
int length = vsnprintf(buffer, BUFFER_SIZE, s, va);
if (length < BUFFER_SIZE) {
fOut->write(buffer, length);
} else {
std::unique_ptr<char[]> heap(new char[length + 1]);
vsprintf(heap.get(), s, copy);
fOut->write(heap.get(), length);
}
}
void PipelineStageCodeGenerator::writef(const char* s, ...) {
va_list va;
va_start(va, s);
this->writef(s, va);
va_end(va);
}
void PipelineStageCodeGenerator::writeHeader() {
}
bool PipelineStageCodeGenerator::usesPrecisionModifiers() const {
return false;
}
String PipelineStageCodeGenerator::getTypeName(const Type& type) {
return type.name();
}
void PipelineStageCodeGenerator::writeBinaryExpression(const BinaryExpression& b,
Precedence parentPrecedence) {
if (b.fOperator == Token::PERCENT) {
// need to use "%%" instead of "%" b/c the code will be inside of a printf
Precedence precedence = GetBinaryPrecedence(b.fOperator);
if (precedence >= parentPrecedence) {
this->write("(");
}
this->writeExpression(*b.fLeft, precedence);
this->write(" %% ");
this->writeExpression(*b.fRight, precedence);
if (precedence >= parentPrecedence) {
this->write(")");
}
} else {
INHERITED::writeBinaryExpression(b, parentPrecedence);
}
}
void PipelineStageCodeGenerator::writeIntLiteral(const IntLiteral& i) {
this->write(to_string((int32_t) i.fValue));
}
void PipelineStageCodeGenerator::writeVariableReference(const VariableReference& ref) {
switch (ref.fVariable.fModifiers.fLayout.fBuiltin) {
case SK_INCOLOR_BUILTIN:
this->write("%s");
fFormatArgs->push_back(Compiler::FormatArg::kInput);
break;
case SK_OUTCOLOR_BUILTIN:
this->write("%s");
fFormatArgs->push_back(Compiler::FormatArg::kOutput);
break;
case SK_MAIN_X_BUILTIN:
this->write("sk_FragCoord.x");
break;
case SK_MAIN_Y_BUILTIN:
this->write("sk_FragCoord.y");
break;
default:
this->write(ref.fVariable.fName);
}
}
void PipelineStageCodeGenerator::writeIfStatement(const IfStatement& s) {
if (s.fIsStatic) {
this->write("@");
}
INHERITED::writeIfStatement(s);
}
void PipelineStageCodeGenerator::writeSwitchStatement(const SwitchStatement& s) {
if (s.fIsStatic) {
this->write("@");
}
INHERITED::writeSwitchStatement(s);
}
void PipelineStageCodeGenerator::writeFunction(const FunctionDefinition& f) {
if (f.fDeclaration.fName == "main") {
fFunctionHeader = "";
OutputStream* oldOut = fOut;
StringStream buffer;
fOut = &buffer;
this->write("%s = %s;\n");
fFormatArgs->push_back(Compiler::FormatArg::kOutput);
fFormatArgs->push_back(Compiler::FormatArg::kInput);
for (const auto& s : ((Block&) *f.fBody).fStatements) {
this->writeStatement(*s);
this->writeLine();
}
fOut = oldOut;
this->write(fFunctionHeader);
this->writef("%s", buffer.str().c_str());
} else {
INHERITED::writeFunction(f);
}
}
bool PipelineStageCodeGenerator::writeSection(const char* name, const char* prefix) {
const Section* s = fSectionAndParameterHelper.getSection(name);
if (s) {
this->writef("%s%s", prefix, s->fText.c_str());
return true;
}
return false;
}
void PipelineStageCodeGenerator::writeProgramElement(const ProgramElement& p) {
if (p.fKind == ProgramElement::kSection_Kind) {
return;
}
if (p.fKind == ProgramElement::kVar_Kind) {
const VarDeclarations& decls = (const VarDeclarations&) p;
if (!decls.fVars.size()) {
return;
}
const Variable& var = *((VarDeclaration&) *decls.fVars[0]).fVar;
if (var.fModifiers.fFlags & (Modifiers::kIn_Flag | Modifiers::kUniform_Flag) ||
-1 != var.fModifiers.fLayout.fBuiltin) {
return;
}
}
INHERITED::writeProgramElement(p);
}
} // namespace
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