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// Copyright 2023 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/d3d/SwapChainD3D.h"
#if defined(DAWN_USE_WINDOWS_UI)
#include <windows.ui.xaml.media.dxinterop.h>
#endif // defined(DAWN_USE_WINDOWS_UI)
#include <utility>
#include "dawn/native/Surface.h"
#include "dawn/native/d3d/D3DError.h"
#include "dawn/native/d3d/DeviceD3D.h"
#include "dawn/native/d3d/Forward.h"
#include "dawn/native/d3d/UtilsD3D.h"
namespace dawn::native::d3d {
namespace {
uint32_t PresentModeToBufferCount(wgpu::PresentMode mode) {
switch (mode) {
case wgpu::PresentMode::Immediate:
case wgpu::PresentMode::Fifo:
return 2;
case wgpu::PresentMode::Mailbox:
return 3;
}
}
uint32_t PresentModeToSwapInterval(wgpu::PresentMode mode) {
switch (mode) {
case wgpu::PresentMode::Immediate:
case wgpu::PresentMode::Mailbox:
return 0;
case wgpu::PresentMode::Fifo:
return 1;
}
}
UINT PresentModeToSwapChainFlags(wgpu::PresentMode mode) {
UINT flags = DXGI_SWAP_CHAIN_FLAG_ALLOW_MODE_SWITCH;
if (mode == wgpu::PresentMode::Immediate) {
flags |= DXGI_SWAP_CHAIN_FLAG_ALLOW_TEARING;
}
return flags;
}
DXGI_USAGE ToDXGIUsage(wgpu::TextureUsage usage) {
DXGI_USAGE dxgiUsage = DXGI_CPU_ACCESS_NONE;
if (usage & wgpu::TextureUsage::TextureBinding) {
dxgiUsage |= DXGI_USAGE_SHADER_INPUT;
}
if (usage & wgpu::TextureUsage::StorageBinding) {
dxgiUsage |= DXGI_USAGE_UNORDERED_ACCESS;
}
if (usage & wgpu::TextureUsage::RenderAttachment) {
dxgiUsage |= DXGI_USAGE_RENDER_TARGET_OUTPUT;
}
return dxgiUsage;
}
} // namespace
SwapChain::~SwapChain() = default;
void SwapChain::DestroyImpl() {
SwapChainBase::DestroyImpl();
DetachFromSurface();
}
// Initializes the swapchain on the surface. Note that `previousSwapChain` may or may not be
// nullptr. If it is not nullptr it means that it is the swapchain previously in use on the
// surface and that we have a chance to reuse it's underlying IDXGISwapChain and "buffers".
MaybeError SwapChain::Initialize(SwapChainBase* previousSwapChain) {
DAWN_ASSERT(GetSurface()->GetType() == Surface::Type::WindowsHWND);
// Precompute the configuration parameters we want for the DXGI swapchain.
mConfig.bufferCount = PresentModeToBufferCount(GetPresentMode());
mConfig.format = d3d::DXGITextureFormat(GetFormat());
mConfig.swapChainFlags = PresentModeToSwapChainFlags(GetPresentMode());
mConfig.usage = ToDXGIUsage(GetUsage());
// There is no previous swapchain so we can create one directly and don't have anything else
// to do.
if (previousSwapChain == nullptr) {
return InitializeSwapChainFromScratch();
}
// TODO(crbug.com/dawn/269): figure out what should happen when surfaces are used by
// multiple backends one after the other. It probably needs to block until the backend
// and GPU are completely finished with the previous swapchain.
DAWN_INVALID_IF(previousSwapChain->GetBackendType() != GetBackendType(),
"D3D SwapChain cannot switch backend types from %s to %s.",
previousSwapChain->GetBackendType(), GetBackendType());
SwapChain* previousD3DSwapChain = ToBackend(previousSwapChain);
// TODO(crbug.com/dawn/269): Figure out switching an HWND between devices, it might
// require just losing the reference to the swapchain, but might also need to wait for
// all previous operations to complete.
DAWN_INVALID_IF(GetDevice() != previousSwapChain->GetDevice(),
"D3D SwapChain cannot switch between D3D Devices");
// The previous swapchain is on the same device so we want to reuse it but it is still not
// always possible. Because DXGI requires that a new swapchain be created if the
// DXGI_SWAP_CHAIN_FLAG_ALLOW_TEARING flag is changed.
bool canReuseSwapChain =
((mConfig.swapChainFlags ^ previousD3DSwapChain->mConfig.swapChainFlags) &
DXGI_SWAP_CHAIN_FLAG_ALLOW_TEARING) == 0;
// We can't reuse the previous swapchain, so we destroy it and wait for all of its reference
// to be forgotten (otherwise DXGI complains that there are outstanding references).
if (!canReuseSwapChain) {
DAWN_TRY(previousD3DSwapChain->DetachAndWaitForDeallocation());
return InitializeSwapChainFromScratch();
}
// After all this we know we can reuse the swapchain, see if it is possible to also reuse
// the buffers.
mDXGISwapChain = std::move(previousD3DSwapChain->mDXGISwapChain);
bool canReuseBuffers = GetWidth() == previousSwapChain->GetWidth() &&
GetHeight() == previousSwapChain->GetHeight() &&
GetFormat() == previousSwapChain->GetFormat() &&
GetPresentMode() == previousSwapChain->GetPresentMode();
if (canReuseBuffers) {
this->ReuseBuffers(previousSwapChain);
return {};
}
// We can't reuse the buffers so we need to resize, IDXGSwapChain->ResizeBuffers requires
// that all references to buffers are lost before it is called. Contrary to D3D11, the
// application is responsible for keeping references to the buffers until the GPU is done
// using them so we have no choice but to synchrounously wait for all operations to complete
// on the previous swapchain and then lose references to its buffers.
if (GetBackendType() == wgpu::BackendType::D3D12) {
DAWN_TRY(previousD3DSwapChain->DetachAndWaitForDeallocation());
} else {
previousD3DSwapChain->DetachFromSurface();
}
DAWN_TRY(
CheckHRESULT(mDXGISwapChain->ResizeBuffers(mConfig.bufferCount, GetWidth(), GetHeight(),
mConfig.format, mConfig.swapChainFlags),
"IDXGISwapChain::ResizeBuffer"));
return CollectSwapChainBuffers();
}
MaybeError SwapChain::InitializeSwapChainFromScratch() {
DAWN_ASSERT(mDXGISwapChain == nullptr);
Device* device = ToBackend(GetDevice());
DXGI_SWAP_CHAIN_DESC1 swapChainDesc = {};
swapChainDesc.Width = GetWidth();
swapChainDesc.Height = GetHeight();
swapChainDesc.Format = mConfig.format;
swapChainDesc.Stereo = false;
swapChainDesc.SampleDesc.Count = 1;
swapChainDesc.SampleDesc.Quality = 0;
swapChainDesc.BufferUsage = mConfig.usage;
swapChainDesc.BufferCount = mConfig.bufferCount;
swapChainDesc.Scaling = DXGI_SCALING_STRETCH;
swapChainDesc.SwapEffect = DXGI_SWAP_EFFECT_FLIP_DISCARD;
swapChainDesc.AlphaMode = DXGI_ALPHA_MODE_IGNORE;
swapChainDesc.Flags = mConfig.swapChainFlags;
ComPtr<IDXGIFactory2> factory2 = nullptr;
DAWN_TRY(CheckHRESULT(device->GetFactory()->QueryInterface(IID_PPV_ARGS(&factory2)),
"Getting IDXGIFactory2"));
ComPtr<IDXGISwapChain1> swapChain1;
switch (GetSurface()->GetType()) {
case Surface::Type::WindowsHWND: {
DAWN_TRY(CheckHRESULT(
factory2->CreateSwapChainForHwnd(GetD3DDeviceForCreatingSwapChain(),
static_cast<HWND>(GetSurface()->GetHWND()),
&swapChainDesc, nullptr, nullptr, &swapChain1),
"Creating the IDXGISwapChain1"));
break;
}
case Surface::Type::WindowsCoreWindow: {
DAWN_TRY(CheckHRESULT(
factory2->CreateSwapChainForCoreWindow(GetD3DDeviceForCreatingSwapChain(),
GetSurface()->GetCoreWindow(),
&swapChainDesc, nullptr, &swapChain1),
"Creating the IDXGISwapChain1"));
break;
}
#if defined(DAWN_USE_WINDOWS_UI)
case Surface::Type::WindowsSwapChainPanel: {
DAWN_TRY(CheckHRESULT(
factory2->CreateSwapChainForComposition(GetD3DDeviceForCreatingSwapChain(),
&swapChainDesc, nullptr, &swapChain1),
"Creating the IDXGISwapChain1"));
ComPtr<ISwapChainPanelNative> swapChainPanelNative;
DAWN_TRY(CheckHRESULT(GetSurface()->GetSwapChainPanel()->QueryInterface(
IID_PPV_ARGS(&swapChainPanelNative)),
"Getting ISwapChainPanelNative"));
DAWN_TRY(CheckHRESULT(swapChainPanelNative->SetSwapChain(swapChain1.Get()),
"Setting SwapChain"));
break;
}
#endif // defined(DAWN_USE_WINDOWS_UI)
default:
UNREACHABLE();
}
DAWN_TRY(CheckHRESULT(swapChain1.As(&mDXGISwapChain), "Gettting IDXGISwapChain1"));
return CollectSwapChainBuffers();
}
MaybeError SwapChain::PresentDXGISwapChain() {
// Do the actual present. DXGI_STATUS_OCCLUDED is a valid return value that's just a
// message to the application that it could stop rendering.
HRESULT presentResult = mDXGISwapChain->Present(PresentModeToSwapInterval(GetPresentMode()), 0);
if (presentResult != DXGI_STATUS_OCCLUDED) {
DAWN_TRY(CheckHRESULT(presentResult, "IDXGISwapChain::Present"));
}
return {};
}
void SwapChain::ReleaseDXGISwapChain() {
mDXGISwapChain = nullptr;
}
IDXGISwapChain3* SwapChain::GetDXGISwapChain() const {
return mDXGISwapChain.Get();
}
const SwapChain::Config& SwapChain::GetConfig() const {
return mConfig;
}
} // namespace dawn::native::d3d