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// Copyright 2021 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_SEM_SAMPLER_TEXTURE_PAIR_H_
#define SRC_SEM_SAMPLER_TEXTURE_PAIR_H_
#include <cstdint>
#include <functional>
#include "src/sem/binding_point.h"
namespace tint {
namespace sem {
/// Mapping of a sampler to a texture it samples.
struct SamplerTexturePair {
/// group & binding values for a sampler.
BindingPoint sampler_binding_point;
/// group & binding values for a texture samepled by the sampler.
BindingPoint texture_binding_point;
/// Equality operator
/// @param rhs the SamplerTexturePair to compare against
/// @returns true if this SamplerTexturePair is equal to `rhs`
inline bool operator==(const SamplerTexturePair& rhs) const {
return sampler_binding_point == rhs.sampler_binding_point &&
texture_binding_point == rhs.texture_binding_point;
}
/// Inequality operator
/// @param rhs the SamplerTexturePair to compare against
/// @returns true if this SamplerTexturePair is not equal to `rhs`
inline bool operator!=(const SamplerTexturePair& rhs) const {
return !(*this == rhs);
}
};
} // namespace sem
} // namespace tint
namespace std {
/// Custom std::hash specialization for tint::sem::SamplerTexturePair so
/// SamplerTexturePairs be used as keys for std::unordered_map and
/// std::unordered_set.
template <>
class hash<tint::sem::SamplerTexturePair> {
public:
/// @param stp the texture pair to create a hash for
/// @return the hash value
inline std::size_t operator()(
const tint::sem::SamplerTexturePair& stp) const {
return tint::utils::Hash(stp.sampler_binding_point,
stp.texture_binding_point);
}
};
} // namespace std
#endif // SRC_SEM_SAMPLER_TEXTURE_PAIR_H_