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// Copyright 2017 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/metal/SwapChainMTL.h"
#include "dawn/native/Surface.h"
#include "dawn/native/metal/DeviceMTL.h"
#include "dawn/native/metal/TextureMTL.h"
#import <QuartzCore/CAMetalLayer.h>
namespace dawn::native::metal {
// static
ResultOrError<Ref<SwapChain>> SwapChain::Create(Device* device,
Surface* surface,
SwapChainBase* previousSwapChain,
const SwapChainDescriptor* descriptor) {
Ref<SwapChain> swapchain = AcquireRef(new SwapChain(device, surface, descriptor));
DAWN_TRY(swapchain->Initialize(previousSwapChain));
return swapchain;
}
SwapChain::SwapChain(DeviceBase* dev, Surface* sur, const SwapChainDescriptor* desc)
: SwapChainBase(dev, sur, desc) {}
SwapChain::~SwapChain() = default;
void SwapChain::DestroyImpl() {
SwapChainBase::DestroyImpl();
DetachFromSurface();
}
MaybeError SwapChain::Initialize(SwapChainBase* previousSwapChain) {
ASSERT(GetSurface()->GetType() == Surface::Type::MetalLayer);
if (previousSwapChain != nullptr) {
// 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() != wgpu::BackendType::Metal,
"Metal SwapChain cannot switch backend types from %s to %s.",
previousSwapChain->GetBackendType(), wgpu::BackendType::Metal);
previousSwapChain->DetachFromSurface();
}
mLayer = static_cast<CAMetalLayer*>(GetSurface()->GetMetalLayer());
ASSERT(mLayer != nullptr);
CGSize size = {};
size.width = GetWidth();
size.height = GetHeight();
[*mLayer setDrawableSize:size];
[*mLayer setFramebufferOnly:(GetUsage() == wgpu::TextureUsage::RenderAttachment)];
[*mLayer setDevice:ToBackend(GetDevice())->GetMTLDevice()];
[*mLayer setPixelFormat:MetalPixelFormat(GetDevice(), GetFormat())];
#if DAWN_PLATFORM_IS(MACOS)
[*mLayer setDisplaySyncEnabled:(GetPresentMode() != wgpu::PresentMode::Immediate)];
#endif // DAWN_PLATFORM_IS(MACOS)
// There is no way to control Fifo vs. Mailbox in Metal.
return {};
}
MaybeError SwapChain::PresentImpl() {
ASSERT(mCurrentDrawable != nullptr);
[*mCurrentDrawable present];
mTexture->APIDestroy();
mTexture = nullptr;
mCurrentDrawable = nullptr;
return {};
}
ResultOrError<Ref<TextureBase>> SwapChain::GetCurrentTextureImpl() {
@autoreleasepool {
ASSERT(mCurrentDrawable == nullptr);
mCurrentDrawable = [*mLayer nextDrawable];
TextureDescriptor textureDesc = GetSwapChainBaseTextureDescriptor(this);
mTexture = Texture::CreateWrapping(ToBackend(GetDevice()), &textureDesc,
NSPRef<id<MTLTexture>>([*mCurrentDrawable texture]));
return mTexture;
}
}
void SwapChain::DetachFromSurfaceImpl() {
ASSERT((mTexture == nullptr) == (mCurrentDrawable == nullptr));
if (mTexture != nullptr) {
mTexture->APIDestroy();
mTexture = nullptr;
mCurrentDrawable = nullptr;
}
}
} // namespace dawn::native::metal