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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_SWIZZLE
#define SKSL_SWIZZLE
#include "include/core/SkTypes.h"
#include "include/private/SkSLDefines.h"
#include "include/private/SkSLIRNode.h"
#include "include/sksl/SkSLPosition.h"
#include "src/sksl/ir/SkSLExpression.h"
#include "src/sksl/ir/SkSLType.h"
#include <cstdint>
#include <memory>
#include <string>
#include <string_view>
#include <utility>
namespace SkSL {
class Context;
enum class OperatorPrecedence : uint8_t;
/**
* Represents a vector swizzle operation such as 'float3(1, 2, 3).zyx'.
*/
class Swizzle final : public Expression {
public:
inline static constexpr Kind kIRNodeKind = Kind::kSwizzle;
Swizzle(const Context& context, Position pos, std::unique_ptr<Expression> base,
const ComponentArray& components)
: INHERITED(pos, kIRNodeKind,
&base->type().componentType().toCompound(context, components.size(), 1))
, fBase(std::move(base))
, fComponents(components) {
SkASSERT(this->components().size() >= 1 && this->components().size() <= 4);
}
// Swizzle::Convert permits component arrays containing ZERO or ONE, does typechecking, reports
// errors via ErrorReporter, and returns an expression that combines constructors and native
// swizzles (comprised solely of X/Y/W/Z).
static std::unique_ptr<Expression> Convert(const Context& context,
Position pos,
Position maskPos,
std::unique_ptr<Expression> base,
ComponentArray inComponents);
static std::unique_ptr<Expression> Convert(const Context& context,
Position pos,
Position maskPos,
std::unique_ptr<Expression> base,
std::string_view maskString);
// Swizzle::Make does not permit ZERO or ONE in the component array, just X/Y/Z/W; errors are
// reported via ASSERT.
static std::unique_ptr<Expression> Make(const Context& context,
Position pos,
std::unique_ptr<Expression> expr,
ComponentArray inComponents);
std::unique_ptr<Expression>& base() {
return fBase;
}
const std::unique_ptr<Expression>& base() const {
return fBase;
}
const ComponentArray& components() const {
return fComponents;
}
std::unique_ptr<Expression> clone(Position pos) const override {
return std::unique_ptr<Expression>(new Swizzle(pos, &this->type(), this->base()->clone(),
this->components()));
}
std::string description(OperatorPrecedence) const override;
private:
Swizzle(Position pos, const Type* type, std::unique_ptr<Expression> base,
const ComponentArray& components)
: INHERITED(pos, kIRNodeKind, type)
, fBase(std::move(base))
, fComponents(components) {
SkASSERT(this->components().size() >= 1 && this->components().size() <= 4);
}
std::unique_ptr<Expression> fBase;
ComponentArray fComponents;
using INHERITED = Expression;
};
} // namespace SkSL
#endif
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