| // 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_ |