mirror of
https://github.com/encounter/dawn-cmake.git
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67 lines
2.5 KiB
C++
67 lines
2.5 KiB
C++
// Copyright 2017 The NXT 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 "CommandAllocatorManager.h"
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#include "D3D12Backend.h"
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#include "common/BitSetIterator.h"
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namespace backend {
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namespace d3d12 {
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CommandAllocatorManager::CommandAllocatorManager(Device* device) : device(device), allocatorCount(0) {
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freeAllocators.set();
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}
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ComPtr<ID3D12CommandAllocator> CommandAllocatorManager::ReserveCommandAllocator() {
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// If there are no free allocators, get the oldest serial in flight and wait on it
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if (freeAllocators.none()) {
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const uint64_t firstSerial = inFlightCommandAllocators.FirstSerial();
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device->WaitForSerial(firstSerial);
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Tick(firstSerial);
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}
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ASSERT(freeAllocators.any());
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// Get the index of the first free allocator from the bitset
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unsigned int firstFreeIndex = *(IterateBitSet(freeAllocators).begin());
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if (firstFreeIndex >= allocatorCount) {
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ASSERT(firstFreeIndex == allocatorCount);
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allocatorCount++;
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ASSERT_SUCCESS(device->GetD3D12Device()->CreateCommandAllocator(D3D12_COMMAND_LIST_TYPE_DIRECT, IID_PPV_ARGS(&commandAllocators[firstFreeIndex])));
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}
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// Mark the command allocator as used
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freeAllocators.reset(firstFreeIndex);
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// Enqueue the command allocator. It will be scheduled for reset after the next ExecuteCommandLists
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inFlightCommandAllocators.Enqueue({commandAllocators[firstFreeIndex], firstFreeIndex}, device->GetSerial());
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return commandAllocators[firstFreeIndex];
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}
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void CommandAllocatorManager::Tick(uint64_t lastCompletedSerial) {
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// Reset all command allocators that are no longer in flight
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for (auto it : inFlightCommandAllocators.IterateUpTo(lastCompletedSerial)) {
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ASSERT_SUCCESS(it.commandAllocator->Reset());
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freeAllocators.set(it.index);
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}
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inFlightCommandAllocators.ClearUpTo(lastCompletedSerial);
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}
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}
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}
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