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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_TINT_API_COMMON_BINDING_POINT_H_
#define SRC_TINT_API_COMMON_BINDING_POINT_H_
#include <stdint.h>
#include <functional>
#include "src/tint/utils/math/hash.h"
#include "src/tint/utils/reflection/reflection.h"
#include "src/tint/utils/text/string_stream.h"
#include "src/tint/utils/traits/traits.h"
namespace tint {
/// BindingPoint holds a group and binding index.
struct BindingPoint {
/// The `@group` part of the binding point
uint32_t group = 0;
/// The `@binding` part of the binding point
uint32_t binding = 0;
/// Reflect the fields of this class so that it can be used by tint::ForeachField()
TINT_REFLECT(group, binding);
/// Equality operator
/// @param rhs the BindingPoint to compare against
/// @returns true if this BindingPoint is equal to `rhs`
inline bool operator==(const BindingPoint& rhs) const {
return group == rhs.group && binding == rhs.binding;
}
/// Inequality operator
/// @param rhs the BindingPoint to compare against
/// @returns true if this BindingPoint is not equal to `rhs`
inline bool operator!=(const BindingPoint& rhs) const { return !(*this == rhs); }
/// Less-than operator
/// @param rhs the BindingPoint to compare against
/// @returns true if this BindingPoint comes before @p rhs
inline bool operator<(const BindingPoint& rhs) const {
if (group < rhs.group) {
return true;
}
if (group > rhs.group) {
return false;
}
return binding < rhs.binding;
}
};
/// Prints the BindingPoint @p bp to @p o
/// @param o the stream to write to
/// @param bp the BindingPoint
/// @return the stream so calls can be chained
template <typename STREAM, typename = traits::EnableIfIsOStream<STREAM>>
auto& operator<<(STREAM& o, const BindingPoint& bp) {
return o << "[group: " << bp.group << ", binding: " << bp.binding << "]";
}
} // namespace tint
namespace std {
/// Custom std::hash specialization for tint::BindingPoint so BindingPoints can be used as keys for
/// std::unordered_map and std::unordered_set.
template <>
class hash<tint::BindingPoint> {
public:
/// @param binding_point the binding point to create a hash for
/// @return the hash value
inline std::size_t operator()(const tint::BindingPoint& binding_point) const {
return tint::Hash(binding_point.group, binding_point.binding);
}
};
} // namespace std
#endif // SRC_TINT_API_COMMON_BINDING_POINT_H_