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/* -*- Mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; tab-width: 4; -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "GLScreenBuffer.h"
#include "CompositorTypes.h"
#include "GLContext.h"
#include "gfx2DGlue.h"
#include "MozFramebuffer.h"
#include "SharedSurface.h"
namespace mozilla::gl {
// -
// SwapChainPresenter
// We need to apply pooling on Android because of the AndroidSurface slow
// destructor bugs. They cause a noticeable performance hit. See bug
// #1646073.
static constexpr size_t kPoolSize =
#if defined(MOZ_WIDGET_ANDROID)
4;
#else
0;
#endif
UniquePtr<SwapChainPresenter> SwapChain::Acquire(const gfx::IntSize& size) {
MOZ_ASSERT(mFactory);
std::shared_ptr<SharedSurface> surf;
if (!mPool.empty() && mPool.front()->mDesc.size != size) {
mPool = {};
}
if (kPoolSize && mPool.size() == kPoolSize) {
surf = mPool.front();
mPool.pop();
}
if (!surf) {
auto uniquePtrSurf = mFactory->CreateShared(size);
if (!uniquePtrSurf) return nullptr;
surf.reset(uniquePtrSurf.release());
}
mPool.push(surf);
while (mPool.size() > kPoolSize) {
mPool.pop();
}
auto ret = MakeUnique<SwapChainPresenter>(*this);
const auto old = ret->SwapBackBuffer(surf);
MOZ_ALWAYS_TRUE(!old);
return ret;
}
void SwapChain::ClearPool() {
mPool = {};
mPrevFrontBuffer = nullptr;
}
// -
SwapChainPresenter::SwapChainPresenter(SwapChain& swapChain)
: mSwapChain(&swapChain) {
MOZ_RELEASE_ASSERT(mSwapChain->mPresenter == nullptr);
mSwapChain->mPresenter = this;
}
SwapChainPresenter::~SwapChainPresenter() {
if (!mSwapChain) return;
MOZ_RELEASE_ASSERT(mSwapChain->mPresenter == this);
mSwapChain->mPresenter = nullptr;
auto newFront = SwapBackBuffer(nullptr);
if (newFront) {
mSwapChain->mPrevFrontBuffer = mSwapChain->mFrontBuffer;
mSwapChain->mFrontBuffer = newFront;
}
}
std::shared_ptr<SharedSurface> SwapChainPresenter::SwapBackBuffer(
std::shared_ptr<SharedSurface> back) {
if (mBackBuffer) {
mBackBuffer->UnlockProd();
mBackBuffer->ProducerRelease();
mBackBuffer->Commit();
}
auto old = mBackBuffer;
mBackBuffer = back;
if (mBackBuffer) {
mBackBuffer->WaitForBufferOwnership();
mBackBuffer->ProducerAcquire();
mBackBuffer->LockProd();
}
return old;
}
GLuint SwapChainPresenter::Fb() const {
if (!mBackBuffer) return 0;
const auto& fb = mBackBuffer->mFb;
if (!fb) return 0;
return fb->mFB;
}
// -
// SwapChain
SwapChain::SwapChain() = default;
SwapChain::~SwapChain() {
if (mPresenter) {
// Out of order destruction, but ok.
(void)mPresenter->SwapBackBuffer(nullptr);
mPresenter->mSwapChain = nullptr;
mPresenter = nullptr;
}
}
} // namespace mozilla::gl
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