| // Copyright 2018 The Dawn 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_DAWN_NATIVE_RINGBUFFERALLOCATOR_H_ |
| #define SRC_DAWN_NATIVE_RINGBUFFERALLOCATOR_H_ |
| |
| #include <limits> |
| #include <memory> |
| |
| #include "dawn/common/SerialQueue.h" |
| #include "dawn/native/IntegerTypes.h" |
| |
| // RingBufferAllocator is the front-end implementation used to manage a ring buffer in GPU memory. |
| namespace dawn::native { |
| |
| class RingBufferAllocator { |
| public: |
| RingBufferAllocator(); |
| explicit RingBufferAllocator(uint64_t maxSize); |
| RingBufferAllocator(const RingBufferAllocator&); |
| ~RingBufferAllocator(); |
| |
| RingBufferAllocator& operator=(const RingBufferAllocator&); |
| |
| uint64_t Allocate(uint64_t allocationSize, ExecutionSerial serial); |
| void Deallocate(ExecutionSerial lastCompletedSerial); |
| |
| uint64_t GetSize() const; |
| bool Empty() const; |
| uint64_t GetUsedSize() const; |
| |
| static constexpr uint64_t kInvalidOffset = std::numeric_limits<uint64_t>::max(); |
| |
| private: |
| struct Request { |
| uint64_t endOffset; |
| uint64_t size; |
| }; |
| |
| SerialQueue<ExecutionSerial, Request> mInflightRequests; // Queue of the recorded sub-alloc |
| // requests (e.g. frame of resources). |
| |
| uint64_t mUsedEndOffset = 0; // Tail of used sub-alloc requests (in bytes). |
| uint64_t mUsedStartOffset = 0; // Head of used sub-alloc requests (in bytes). |
| uint64_t mMaxBlockSize = 0; // Max size of the ring buffer (in bytes). |
| uint64_t mUsedSize = 0; // Size of the sub-alloc requests (in bytes) of the ring buffer. |
| uint64_t mCurrentRequestSize = |
| 0; // Size of the sub-alloc requests (in bytes) of the current serial. |
| }; |
| } // namespace dawn::native |
| |
| #endif // SRC_DAWN_NATIVE_RINGBUFFERALLOCATOR_H_ |