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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.
*/
#ifndef SKSL_INDEX
#define SKSL_INDEX
#include "SkSLContext.h"
#include "SkSLExpression.h"
#include "SkSLUtil.h"
namespace SkSL {
/**
* Given a type, returns the type that will result from extracting an array value from it.
*/
static const Type& index_type(const Context& context, const Type& type) {
if (type.kind() == Type::kMatrix_Kind) {
if (type.componentType() == *context.fFloat_Type) {
switch (type.rows()) {
case 2: return *context.fFloat2_Type;
case 3: return *context.fFloat3_Type;
case 4: return *context.fFloat4_Type;
default: SkASSERT(false);
}
} else if (type.componentType() == *context.fHalf_Type) {
switch (type.rows()) {
case 2: return *context.fHalf2_Type;
case 3: return *context.fHalf3_Type;
case 4: return *context.fHalf4_Type;
default: SkASSERT(false);
}
} else {
SkASSERT(type.componentType() == *context.fDouble_Type);
switch (type.rows()) {
case 2: return *context.fDouble2_Type;
case 3: return *context.fDouble3_Type;
case 4: return *context.fDouble4_Type;
default: SkASSERT(false);
}
}
}
return type.componentType();
}
/**
* An expression which extracts a value from an array or matrix, as in 'm[2]'.
*/
struct IndexExpression : public Expression {
IndexExpression(const Context& context, std::unique_ptr<Expression> base,
std::unique_ptr<Expression> index)
: INHERITED(base->fOffset, kIndex_Kind, index_type(context, base->fType))
, fBase(std::move(base))
, fIndex(std::move(index)) {
SkASSERT(fIndex->fType == *context.fInt_Type || fIndex->fType == *context.fUInt_Type);
}
bool hasSideEffects() const override {
return fBase->hasSideEffects() || fIndex->hasSideEffects();
}
String description() const override {
return fBase->description() + "[" + fIndex->description() + "]";
}
std::unique_ptr<Expression> fBase;
std::unique_ptr<Expression> fIndex;
typedef Expression INHERITED;
};
} // namespace
#endif
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