gfx/gl/GLScreenBuffer.cpp

   1 /* -*- Mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; tab-width: 4; -*- */
   2 /* This Source Code Form is subject to the terms of the Mozilla Public
   3  * License, v. 2.0. If a copy of the MPL was not distributed with this
   4  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   5
   6 #include "GLScreenBuffer.h"
   7
   8 #include "CompositorTypes.h"
   9 #include "GLContext.h"
  10 #include "gfx2DGlue.h"
  11 #include "MozFramebuffer.h"
  12 #include "SharedSurface.h"
  13 #include "mozilla/gfx/BuildConstants.h"
  14
  15 namespace mozilla::gl {
  16
  17 // -
  18 // SwapChainPresenter
  19
  20 UniquePtr<SwapChainPresenter> SwapChain::Acquire(
  21     const gfx::IntSize& size, const gfx::ColorSpace2 colorSpace) {
  22   MOZ_ASSERT(mFactory);
  23
  24   std::shared_ptr<SharedSurface> surf;
  25   if (!mPool.empty()) {
  26     // Try reuse
  27     const auto& existingDesc = mPool.front()->mDesc;
  28     auto newDesc = existingDesc;
  29     newDesc.size = size;
  30     newDesc.colorSpace = colorSpace;
  31     if (newDesc != existingDesc || !mPool.front()->IsValid()) {
  32       mPool = {};
  33     }
  34   }
  35
  36   // When pooling is disabled, recycling of SharedSurfaces is managed by the
  37   // owner of the SwapChain by calling StoreRecycledSurface().
  38   if (!mPool.empty() && (!mPoolLimit || mPool.size() >= mPoolLimit)) {
  39     surf = mPool.front();
  40     mPool.pop();
  41   }
  42   if (!surf) {
  43     auto uniquePtrSurf = mFactory->CreateShared(size, colorSpace);
  44     if (!uniquePtrSurf) return nullptr;
  45     surf.reset(uniquePtrSurf.release());
  46   }
  47   if (mPoolLimit > 0) {
  48     mPool.push(surf);
  49     while (mPool.size() > mPoolLimit) {
  50       mPool.pop();
  51     }
  52   }
  53
  54   auto ret = MakeUnique<SwapChainPresenter>(*this);
  55   const auto old = ret->SwapBackBuffer(surf);
  56   MOZ_ALWAYS_TRUE(!old);
  57   return ret;
  58 }
  59
  60 void SwapChain::ClearPool() {
  61   mPool = {};
  62   mPrevFrontBuffer = nullptr;
  63 }
  64
  65 bool SwapChain::StoreRecycledSurface(
  66     const std::shared_ptr<SharedSurface>& surf) {
  67   MOZ_ASSERT(mFactory);
  68   // Don't allow external recycled surfaces if SwapChain is managing own pool.
  69   MOZ_ASSERT(!mPoolLimit);
  70   if (mPoolLimit > 0 || !mFactory ||
  71       NS_WARN_IF(surf->mDesc.gl != mFactory->mDesc.gl)) {
  72     // Ensure we don't accidentally store an expired shared surface or from a
  73     // different context.
  74     return false;
  75   }
  76   mPool.push(surf);
  77   return true;
  78 }
  79
  80 // -
  81
  82 SwapChainPresenter::SwapChainPresenter(SwapChain& swapChain)
  83     : mSwapChain(&swapChain) {
  84   MOZ_RELEASE_ASSERT(mSwapChain->mPresenter == nullptr);
  85   mSwapChain->mPresenter = this;
  86 }
  87
  88 SwapChainPresenter::~SwapChainPresenter() {
  89   if (!mSwapChain) return;
  90   MOZ_RELEASE_ASSERT(mSwapChain->mPresenter == this);
  91   mSwapChain->mPresenter = nullptr;
  92
  93   auto newFront = SwapBackBuffer(nullptr);
  94   if (newFront) {
  95     mSwapChain->mPrevFrontBuffer = mSwapChain->mFrontBuffer;
  96     mSwapChain->mFrontBuffer = newFront;
  97   }
  98 }
  99
 100 std::shared_ptr<SharedSurface> SwapChainPresenter::SwapBackBuffer(
 101     std::shared_ptr<SharedSurface> back) {
 102   if (mBackBuffer) {
 103     mBackBuffer->UnlockProd();
 104     mBackBuffer->ProducerRelease();
 105     mBackBuffer->Commit();
 106   }
 107   auto old = mBackBuffer;
 108   mBackBuffer = back;
 109   if (mBackBuffer) {
 110     mBackBuffer->WaitForBufferOwnership();
 111     mBackBuffer->ProducerAcquire();
 112     mBackBuffer->LockProd();
 113   }
 114   return old;
 115 }
 116
 117 GLuint SwapChainPresenter::Fb() const {
 118   if (!mBackBuffer) return 0;
 119   const auto& fb = mBackBuffer->mFb;
 120   if (!fb) return 0;
 121   return fb->mFB;
 122 }
 123
 124 // -
 125 // SwapChain
 126
 127 SwapChain::SwapChain()
 128     :  // We need to apply pooling on Android because of the AndroidSurface slow
 129        // destructor bugs. They cause a noticeable performance hit. See bug
 130        // #1646073.
 131       mPoolLimit(kIsAndroid ? 4 : 0) {}
 132
 133 SwapChain::~SwapChain() {
 134   if (mPresenter) {
 135     // Out of order destruction, but ok.
 136     (void)mPresenter->SwapBackBuffer(nullptr);
 137     mPresenter->mSwapChain = nullptr;
 138     mPresenter = nullptr;
 139   }
 140   if (mDestroyedCallback) {
 141     mDestroyedCallback();
 142   }
 143 }
 144
 145 }  // namespace mozilla::gl