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// Copyright 2022 The Dawn & Tint Authors
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice, this
// list of conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright notice,
// this list of conditions and the following disclaimer in the documentation
// and/or other materials provided with the distribution.
//
// 3. Neither the name of the copyright holder nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
// OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#ifndef DAWN_WIRE_OBJECTHANDLE_H_
#define DAWN_WIRE_OBJECTHANDLE_H_
#include <cstddef>
#include <cstdint>
#include "dawn/common/HashUtils.h"
namespace dawn::wire {
using ObjectId = uint32_t;
using ObjectGeneration = uint32_t;
// ObjectHandle identifies some WebGPU object in the wire.
// An ObjectHandle will never be reused, so can be used to uniquely identify an object forever.
struct ObjectHandle {
ObjectId id = 0;
ObjectGeneration generation = 0;
ObjectHandle();
ObjectHandle(ObjectId id, ObjectGeneration generation);
explicit ObjectHandle(const volatile ObjectHandle& rhs);
ObjectHandle& operator=(const volatile ObjectHandle& rhs);
ObjectHandle(const ObjectHandle& rhs);
ObjectHandle& operator=(const ObjectHandle& rhs);
// MSVC has a bug where it thinks the volatile copy assignment is a duplicate.
// Workaround this by forwarding to a different function AssignFrom.
template <typename T>
ObjectHandle& operator=(const T& rhs) {
return AssignFrom(rhs);
}
ObjectHandle& AssignFrom(const ObjectHandle& rhs);
ObjectHandle& AssignFrom(const volatile ObjectHandle& rhs);
bool operator==(const ObjectHandle& other) const;
bool IsValid() const;
};
} // namespace dawn::wire
template <>
struct std::hash<dawn::wire::ObjectHandle> {
size_t operator()(const dawn::wire::ObjectHandle& value) const {
size_t hash = dawn::Hash(value.id);
dawn::HashCombine(&hash, value.generation);
return hash;
}
};
#endif // DAWN_WIRE_OBJECTHANDLE_H_