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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.
#include "dawn_native/d3d12/NativeSwapChainImplD3D12.h"
#include "common/Assert.h"
#include "dawn_native/d3d12/DeviceD3D12.h"
#include "dawn_native/d3d12/TextureD3D12.h"
namespace dawn::native::d3d12 {
namespace {
DXGI_USAGE D3D12SwapChainBufferUsage(WGPUTextureUsage allowedUsages) {
DXGI_USAGE usage = DXGI_CPU_ACCESS_NONE;
if (allowedUsages & WGPUTextureUsage_TextureBinding) {
usage |= DXGI_USAGE_SHADER_INPUT;
}
if (allowedUsages & WGPUTextureUsage_StorageBinding) {
usage |= DXGI_USAGE_UNORDERED_ACCESS;
}
if (allowedUsages & WGPUTextureUsage_RenderAttachment) {
usage |= DXGI_USAGE_RENDER_TARGET_OUTPUT;
}
return usage;
}
static constexpr unsigned int kFrameCount = 3;
} // anonymous namespace
NativeSwapChainImpl::NativeSwapChainImpl(Device* device, HWND window)
: mWindow(window), mDevice(device), mInterval(1) {
}
NativeSwapChainImpl::~NativeSwapChainImpl() {
}
void NativeSwapChainImpl::Init(DawnWSIContextD3D12* /*context*/) {
}
DawnSwapChainError NativeSwapChainImpl::Configure(WGPUTextureFormat format,
WGPUTextureUsage usage,
uint32_t width,
uint32_t height) {
ASSERT(width > 0);
ASSERT(height > 0);
ASSERT(format == static_cast<WGPUTextureFormat>(GetPreferredFormat()));
ComPtr<IDXGIFactory4> factory = mDevice->GetFactory();
ComPtr<ID3D12CommandQueue> queue = mDevice->GetCommandQueue();
mInterval = mDevice->IsToggleEnabled(Toggle::TurnOffVsync) == true ? 0 : 1;
// Create the D3D12 swapchain, assuming only two buffers for now
DXGI_SWAP_CHAIN_DESC1 swapChainDesc = {};
swapChainDesc.Width = width;
swapChainDesc.Height = height;
swapChainDesc.Format = D3D12TextureFormat(GetPreferredFormat());
swapChainDesc.BufferUsage = D3D12SwapChainBufferUsage(usage);
swapChainDesc.BufferCount = kFrameCount;
swapChainDesc.SwapEffect = DXGI_SWAP_EFFECT_FLIP_DISCARD;
swapChainDesc.SampleDesc.Count = 1;
swapChainDesc.SampleDesc.Quality = 0;
ComPtr<IDXGISwapChain1> swapChain1;
ASSERT_SUCCESS(factory->CreateSwapChainForHwnd(queue.Get(), mWindow, &swapChainDesc,
nullptr, nullptr, &swapChain1));
ASSERT_SUCCESS(swapChain1.As(&mSwapChain));
// Gather the resources that will be used to present to the swapchain
mBuffers.resize(kFrameCount);
for (uint32_t i = 0; i < kFrameCount; ++i) {
ASSERT_SUCCESS(mSwapChain->GetBuffer(i, IID_PPV_ARGS(&mBuffers[i])));
}
// Set the initial serial of buffers to 0 so that we don't wait on them when they are first
// used
mBufferSerials.resize(kFrameCount, ExecutionSerial(0));
return DAWN_SWAP_CHAIN_NO_ERROR;
}
DawnSwapChainError NativeSwapChainImpl::GetNextTexture(DawnSwapChainNextTexture* nextTexture) {
mCurrentBuffer = mSwapChain->GetCurrentBackBufferIndex();
nextTexture->texture.ptr = mBuffers[mCurrentBuffer].Get();
// TODO(crbug.com/dawn/269) Currently we force the CPU to wait for the GPU to be finished
// with the buffer. Ideally the synchronization should be all done on the GPU.
ASSERT(mDevice->WaitForSerial(mBufferSerials[mCurrentBuffer]).IsSuccess());
return DAWN_SWAP_CHAIN_NO_ERROR;
}
DawnSwapChainError NativeSwapChainImpl::Present() {
// This assumes the texture has already been transition to the PRESENT state.
ASSERT_SUCCESS(mSwapChain->Present(mInterval, 0));
// TODO(crbug.com/dawn/833): Make the serial ticking implicit.
ASSERT(mDevice->NextSerial().IsSuccess());
mBufferSerials[mCurrentBuffer] = mDevice->GetPendingCommandSerial();
return DAWN_SWAP_CHAIN_NO_ERROR;
}
wgpu::TextureFormat NativeSwapChainImpl::GetPreferredFormat() const {
return wgpu::TextureFormat::RGBA8Unorm;
}
} // namespace dawn::native::d3d12