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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/SwapChain.h"
#include "dawn_native/Device.h"
#include "dawn_native/Texture.h"
#include "dawn_native/ValidationUtils_autogen.h"
namespace dawn_native {
namespace {
class ErrorSwapChain : public SwapChainBase {
public:
ErrorSwapChain(DeviceBase* device) : SwapChainBase(device, ObjectBase::kError) {
}
private:
TextureBase* GetNextTextureImpl(const TextureDescriptor*) override {
UNREACHABLE();
}
MaybeError OnBeforePresent(TextureBase* texture) override {
UNREACHABLE();
}
};
} // anonymous namespace
MaybeError ValidateSwapChainDescriptor(const DeviceBase* device,
const SwapChainDescriptor* descriptor) {
if (descriptor->implementation == 0) {
return DAWN_VALIDATION_ERROR("Null implementation for the swapchain");
}
DawnSwapChainImplementation* impl =
reinterpret_cast<DawnSwapChainImplementation*>(descriptor->implementation);
if (!impl->Init || !impl->Destroy || !impl->Configure || !impl->GetNextTexture ||
!impl->Present) {
return DAWN_VALIDATION_ERROR("Implementation is incomplete");
}
return {};
}
// SwapChain
SwapChainBase::SwapChainBase(DeviceBase* device, const SwapChainDescriptor* descriptor)
: ObjectBase(device),
mImplementation(
*reinterpret_cast<DawnSwapChainImplementation*>(descriptor->implementation)) {
}
SwapChainBase::SwapChainBase(DeviceBase* device, ObjectBase::ErrorTag tag)
: ObjectBase(device, tag) {
}
SwapChainBase::~SwapChainBase() {
if (!IsError()) {
const auto& im = GetImplementation();
im.Destroy(im.userData);
}
}
// static
SwapChainBase* SwapChainBase::MakeError(DeviceBase* device) {
return new ErrorSwapChain(device);
}
void SwapChainBase::Configure(wgpu::TextureFormat format,
wgpu::TextureUsage allowedUsage,
uint32_t width,
uint32_t height) {
if (GetDevice()->ConsumedError(ValidateConfigure(format, allowedUsage, width, height))) {
return;
}
ASSERT(!IsError());
allowedUsage |= wgpu::TextureUsage::Present;
mFormat = format;
mAllowedUsage = allowedUsage;
mWidth = width;
mHeight = height;
mImplementation.Configure(mImplementation.userData, static_cast<WGPUTextureFormat>(format),
static_cast<WGPUTextureUsage>(allowedUsage), width, height);
}
TextureViewBase* SwapChainBase::GetCurrentTextureView() {
if (GetDevice()->ConsumedError(ValidateGetCurrentTextureView())) {
return TextureViewBase::MakeError(GetDevice());
}
ASSERT(!IsError());
// Return the same current texture view until Present is called.
if (mCurrentTextureView.Get() != nullptr) {
// Calling GetCurrentTextureView always returns a new reference so add it even when
// reuse the existing texture view.
mCurrentTextureView->Reference();
return mCurrentTextureView.Get();
}
// Create the backing texture and the view.
TextureDescriptor descriptor;
descriptor.dimension = wgpu::TextureDimension::e2D;
descriptor.size.width = mWidth;
descriptor.size.height = mHeight;
descriptor.size.depth = 1;
descriptor.arrayLayerCount = 1;
descriptor.sampleCount = 1;
descriptor.format = mFormat;
descriptor.mipLevelCount = 1;
descriptor.usage = mAllowedUsage;
// Get the texture but remove the external refcount because it is never passed outside
// of dawn_native
mCurrentTexture = AcquireRef(GetNextTextureImpl(&descriptor));
mCurrentTextureView = mCurrentTexture->CreateView(nullptr);
return mCurrentTextureView.Get();
}
void SwapChainBase::Present() {
if (GetDevice()->ConsumedError(ValidatePresent())) {
return;
}
ASSERT(!IsError());
if (GetDevice()->ConsumedError(OnBeforePresent(mCurrentTexture.Get()))) {
return;
}
mImplementation.Present(mImplementation.userData);
mCurrentTexture = nullptr;
mCurrentTextureView = nullptr;
}
const DawnSwapChainImplementation& SwapChainBase::GetImplementation() {
ASSERT(!IsError());
return mImplementation;
}
MaybeError SwapChainBase::ValidateConfigure(wgpu::TextureFormat format,
wgpu::TextureUsage allowedUsage,
uint32_t width,
uint32_t height) const {
DAWN_TRY(GetDevice()->ValidateObject(this));
DAWN_TRY(ValidateTextureUsage(allowedUsage));
DAWN_TRY(ValidateTextureFormat(format));
if (width == 0 || height == 0) {
return DAWN_VALIDATION_ERROR("Swap chain cannot be configured to zero size");
}
return {};
}
MaybeError SwapChainBase::ValidateGetCurrentTextureView() const {
DAWN_TRY(GetDevice()->ValidateObject(this));
if (mWidth == 0) {
// If width is 0, it implies swap chain has never been configured
return DAWN_VALIDATION_ERROR("Swap chain needs to be configured before GetNextTexture");
}
return {};
}
MaybeError SwapChainBase::ValidatePresent() const {
DAWN_TRY(GetDevice()->ValidateObject(this));
if (mCurrentTextureView.Get() == nullptr) {
return DAWN_VALIDATION_ERROR(
"Cannot call present without a GetCurrentTextureView call for this frame");
}
return {};
}
} // namespace dawn_native
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