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// 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 DAWNNATIVE_RINGBUFFERALLOCATOR_H_
#define DAWNNATIVE_RINGBUFFERALLOCATOR_H_
#include "common/SerialQueue.h"
#include "dawn_native/IntegerTypes.h"
#include <limits>
#include <memory>
// RingBufferAllocator is the front-end implementation used to manage a ring buffer in GPU memory.
namespace dawn_native {
class RingBufferAllocator {
public:
RingBufferAllocator() = default;
RingBufferAllocator(uint64_t maxSize);
~RingBufferAllocator() = default;
RingBufferAllocator(const RingBufferAllocator&) = default;
RingBufferAllocator& operator=(const RingBufferAllocator&) = default;
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 // DAWNNATIVE_RINGBUFFERALLOCATOR_H_