SkSLConstructorCompound.h

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/*
 * Copyright 2021 Google LLC
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */
 
#ifndef SKSL_CONSTRUCTOR_COMPOUND
#define SKSL_CONSTRUCTOR_COMPOUND
 
#include "src/sksl/SkSLDefines.h"
#include "src/sksl/SkSLPosition.h"
#include "src/sksl/ir/SkSLConstructor.h"
#include "src/sksl/ir/SkSLExpression.h"
#include "src/sksl/ir/SkSLIRNode.h"
 
#include <memory>
#include <utility>
 
namespace SkSL {
 
class Context;
class Type;
 
/**
 * Represents a vector or matrix that is composed from other expressions, such as
 * `half3(pos.xy, 1)` or `mat3(a.xyz, b.xyz, 0, 0, 1)`
 *
 * These can contain a mix of scalars and aggregates. The total number of scalar values inside the
 * constructor must always match the type's slot count. (e.g. `pos.xy` consumes two slots.)
 * The inner values must have the same component type as the vector/matrix.
 */
class ConstructorCompound final : public MultiArgumentConstructor {
public:
    inline static constexpr Kind kIRNodeKind = Kind::kConstructorCompound;
 
    ConstructorCompound(Position pos, const Type& type, ExpressionArray args)
            : INHERITED(pos, kIRNodeKind, &type, std::move(args)) {}
 
    static std::unique_ptr<Expression> Make(const Context& context,
                                            Position pos,
                                            const Type& type,
                                            ExpressionArray args);
 
    static std::unique_ptr<Expression> MakeFromConstants(const Context& context,
                                                         Position pos,
                                                         const Type& type,
                                                         const double values[]);
 
    std::unique_ptr<Expression> clone(Position pos) const override {
        return std::make_unique<ConstructorCompound>(pos, this->type(), this->arguments().clone());
    }
 
private:
    using INHERITED = MultiArgumentConstructor;
};
 
}  // namespace SkSL
 
#endif