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
  14 namespace mozilla::gl {
  15
  16 // -
  17 // SwapChainPresenter
  18
  19 // We need to apply pooling on Android because of the AndroidSurface slow
  20 // destructor bugs. They cause a noticeable performance hit. See bug
  21 // #1646073.
  22 static constexpr size_t kPoolSize =
  23 #if defined(MOZ_WIDGET_ANDROID)
  24     4;
  25 #else
  26     0;
  27 #endif
  28
  29 UniquePtr<SwapChainPresenter> SwapChain::Acquire(
  30     const gfx::IntSize& size, const gfx::ColorSpace2 colorSpace) {
  31   MOZ_ASSERT(mFactory);
  32
  33   std::shared_ptr<SharedSurface> surf;
  34   if (!mPool.empty()) {
  35     // Try reuse
  36     const auto& existingDesc = mPool.front()->mDesc;
  37     auto newDesc = existingDesc;
  38     newDesc.size = size;
  39     newDesc.colorSpace = colorSpace;
  40     if (newDesc != existingDesc || !mPool.front()->IsValid()) {
  41       mPool = {};
  42     }
  43   }
  44
  45   if (!mPool.empty() && (!kPoolSize || mPool.size() == kPoolSize)) {
  46     surf = mPool.front();
  47     mPool.pop();
  48   }
  49   if (!surf) {
  50     auto uniquePtrSurf = mFactory->CreateShared(size, colorSpace);
  51     if (!uniquePtrSurf) return nullptr;
  52     surf.reset(uniquePtrSurf.release());
  53   }
  54   mPool.push(surf);
  55   while (mPool.size() > kPoolSize) {
  56     mPool.pop();
  57   }
  58
  59   auto ret = MakeUnique<SwapChainPresenter>(*this);
  60   const auto old = ret->SwapBackBuffer(surf);
  61   MOZ_ALWAYS_TRUE(!old);
  62   return ret;
  63 }
  64
  65 void SwapChain::ClearPool() {
  66   mPool = {};
  67   mPrevFrontBuffer = nullptr;
  68 }
  69
  70 void SwapChain::StoreRecycledSurface(
  71     const std::shared_ptr<SharedSurface>& surf) {
  72   mPool.push(surf);
  73 }
  74
  75 // -
  76
  77 SwapChainPresenter::SwapChainPresenter(SwapChain& swapChain)
  78     : mSwapChain(&swapChain) {
  79   MOZ_RELEASE_ASSERT(mSwapChain->mPresenter == nullptr);
  80   mSwapChain->mPresenter = this;
  81 }
  82
  83 SwapChainPresenter::~SwapChainPresenter() {
  84   if (!mSwapChain) return;
  85   MOZ_RELEASE_ASSERT(mSwapChain->mPresenter == this);
  86   mSwapChain->mPresenter = nullptr;
  87
  88   auto newFront = SwapBackBuffer(nullptr);
  89   if (newFront) {
  90     mSwapChain->mPrevFrontBuffer = mSwapChain->mFrontBuffer;
  91     mSwapChain->mFrontBuffer = newFront;
  92   }
  93 }
  94
  95 std::shared_ptr<SharedSurface> SwapChainPresenter::SwapBackBuffer(
  96     std::shared_ptr<SharedSurface> back) {
  97   if (mBackBuffer) {
  98     mBackBuffer->UnlockProd();
  99     mBackBuffer->ProducerRelease();
 100     mBackBuffer->Commit();
 101   }
 102   auto old = mBackBuffer;
 103   mBackBuffer = back;
 104   if (mBackBuffer) {
 105     mBackBuffer->WaitForBufferOwnership();
 106     mBackBuffer->ProducerAcquire();
 107     mBackBuffer->LockProd();
 108   }
 109   return old;
 110 }
 111
 112 GLuint SwapChainPresenter::Fb() const {
 113   if (!mBackBuffer) return 0;
 114   const auto& fb = mBackBuffer->mFb;
 115   if (!fb) return 0;
 116   return fb->mFB;
 117 }
 118
 119 // -
 120 // SwapChain
 121
 122 SwapChain::SwapChain() = default;
 123
 124 SwapChain::~SwapChain() {
 125   if (mPresenter) {
 126     // Out of order destruction, but ok.
 127     (void)mPresenter->SwapBackBuffer(nullptr);
 128     mPresenter->mSwapChain = nullptr;
 129     mPresenter = nullptr;
 130   }
 131   if (mDestroyedCallback) {
 132     mDestroyedCallback();
 133   }
 134 }
 135
 136 }  // namespace mozilla::gl