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// Copyright 2021 The Dawn & Tint Authors
//
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#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/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(BindingPoint, group, binding);
/// @returns the hash code of the BindingPoint
tint::HashCode HashCode() const { return tint::Hash(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 size_t operator()(const tint::BindingPoint& binding_point) const {
return static_cast<size_t>(binding_point.group) << 16 |
static_cast<size_t>(binding_point.binding);
}
};
} // namespace std
#endif // SRC_TINT_API_COMMON_BINDING_POINT_H_