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// Copyright 2022 The Tint Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#ifndef SRC_TINT_CONSTANT_SPLAT_H_
#define SRC_TINT_CONSTANT_SPLAT_H_
#include "src/tint/constant/composite.h"
#include "src/tint/type/type.h"
#include "src/tint/utils/castable.h"
#include "src/tint/utils/vector.h"
namespace tint::constant {
/// Splat holds a single value, duplicated as all children.
///
/// Splat is used for zero-initializers, 'splat' initializers, or initializers where each element is
/// identical. Splat may be of a vector, matrix, array or structure type.
class Splat : public utils::Castable<Splat, Value> {
public:
/// Constructor
/// @param t the splat type
/// @param e the splat element
/// @param n the number of items in the splat
Splat(const type::Type* t, const Value* e, size_t n);
~Splat() override;
/// @returns the type of the splat
const type::Type* Type() const override { return type; }
/// Retrieve item at index @p i
/// @param i the index to retrieve
/// @returns the element, or nullptr if out of bounds
const Value* Index(size_t i) const override { return i < count ? el : nullptr; }
/// @copydoc Value::NumElements()
size_t NumElements() const override { return count; }
/// @returns true if the element is zero
bool AllZero() const override { return el->AllZero(); }
/// @returns true if the element is zero
bool AnyZero() const override { return el->AnyZero(); }
/// @returns the hash for the splat
size_t Hash() const override { return utils::Hash(type, el->Hash(), count); }
/// Clones the constant into the provided context
/// @param ctx the clone context
/// @returns the cloned node
const Splat* Clone(CloneContext& ctx) const override;
/// The type of the splat element
type::Type const* const type;
/// The element stored in the splat
const Value* el;
/// The number of items in the splat
const size_t count;
protected:
/// @returns a monostate variant.
std::variant<std::monostate, AInt, AFloat> InternalValue() const override { return {}; }
};
} // namespace tint::constant
#endif // SRC_TINT_CONSTANT_SPLAT_H_