111 lines
4.8 KiB
C++
111 lines
4.8 KiB
C++
// Copyright 2018 The Dawn Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include "dawn_native/DynamicUploader.h"
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#include "common/Math.h"
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#include "dawn_native/Device.h"
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namespace dawn_native {
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DynamicUploader::DynamicUploader(DeviceBase* device) : mDevice(device) {
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mRingBuffers.emplace_back(std::unique_ptr<RingBuffer>(
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new RingBuffer{nullptr, RingBufferAllocator(kRingBufferSize)}));
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}
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void DynamicUploader::ReleaseStagingBuffer(std::unique_ptr<StagingBufferBase> stagingBuffer) {
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mReleasedStagingBuffers.Enqueue(std::move(stagingBuffer),
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mDevice->GetPendingCommandSerial());
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}
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ResultOrError<UploadHandle> DynamicUploader::Allocate(uint64_t allocationSize, Serial serial) {
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// Disable further sub-allocation should the request be too large.
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if (allocationSize > kRingBufferSize) {
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std::unique_ptr<StagingBufferBase> stagingBuffer;
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DAWN_TRY_ASSIGN(stagingBuffer, mDevice->CreateStagingBuffer(allocationSize));
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UploadHandle uploadHandle;
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uploadHandle.mappedBuffer = static_cast<uint8_t*>(stagingBuffer->GetMappedPointer());
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uploadHandle.stagingBuffer = stagingBuffer.get();
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ReleaseStagingBuffer(std::move(stagingBuffer));
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return uploadHandle;
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}
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// Note: Validation ensures size is already aligned.
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// First-fit: find next smallest buffer large enough to satisfy the allocation request.
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RingBuffer* targetRingBuffer = mRingBuffers.back().get();
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for (auto& ringBuffer : mRingBuffers) {
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const RingBufferAllocator& ringBufferAllocator = ringBuffer->mAllocator;
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// Prevent overflow.
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ASSERT(ringBufferAllocator.GetSize() >= ringBufferAllocator.GetUsedSize());
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const uint64_t remainingSize =
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ringBufferAllocator.GetSize() - ringBufferAllocator.GetUsedSize();
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if (allocationSize <= remainingSize) {
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targetRingBuffer = ringBuffer.get();
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break;
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}
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}
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uint64_t startOffset = RingBufferAllocator::kInvalidOffset;
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if (targetRingBuffer != nullptr) {
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startOffset = targetRingBuffer->mAllocator.Allocate(allocationSize, serial);
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}
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// Upon failure, append a newly created ring buffer to fulfill the
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// request.
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if (startOffset == RingBufferAllocator::kInvalidOffset) {
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mRingBuffers.emplace_back(std::unique_ptr<RingBuffer>(
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new RingBuffer{nullptr, RingBufferAllocator(kRingBufferSize)}));
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targetRingBuffer = mRingBuffers.back().get();
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startOffset = targetRingBuffer->mAllocator.Allocate(allocationSize, serial);
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}
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ASSERT(startOffset != RingBufferAllocator::kInvalidOffset);
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// Allocate the staging buffer backing the ringbuffer.
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// Note: the first ringbuffer will be lazily created.
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if (targetRingBuffer->mStagingBuffer == nullptr) {
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std::unique_ptr<StagingBufferBase> stagingBuffer;
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DAWN_TRY_ASSIGN(stagingBuffer,
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mDevice->CreateStagingBuffer(targetRingBuffer->mAllocator.GetSize()));
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targetRingBuffer->mStagingBuffer = std::move(stagingBuffer);
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}
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ASSERT(targetRingBuffer->mStagingBuffer != nullptr);
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UploadHandle uploadHandle;
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uploadHandle.stagingBuffer = targetRingBuffer->mStagingBuffer.get();
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uploadHandle.mappedBuffer =
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static_cast<uint8_t*>(uploadHandle.stagingBuffer->GetMappedPointer()) + startOffset;
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uploadHandle.startOffset = startOffset;
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return uploadHandle;
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}
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void DynamicUploader::Deallocate(Serial lastCompletedSerial) {
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// Reclaim memory within the ring buffers by ticking (or removing requests no longer
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// in-flight).
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for (size_t i = 0; i < mRingBuffers.size(); ++i) {
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mRingBuffers[i]->mAllocator.Deallocate(lastCompletedSerial);
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// Never erase the last buffer as to prevent re-creating smaller buffers
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// again. The last buffer is the largest.
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if (mRingBuffers[i]->mAllocator.Empty() && i < mRingBuffers.size() - 1) {
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mRingBuffers.erase(mRingBuffers.begin() + i);
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}
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}
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mReleasedStagingBuffers.ClearUpTo(lastCompletedSerial);
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}
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} // namespace dawn_native
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