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79 lines
2.0 KiB
C++
79 lines
2.0 KiB
C++
/* -*- Mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; tab-width: 4; -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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/* GLScreenBuffer is the abstraction for the "default framebuffer" used
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* by an offscreen GLContext. Since it's only for offscreen GLContext's,
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* it's only useful for things like WebGL, and is NOT used by the
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* compositor's GLContext. Remember that GLContext provides an abstraction
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* so that even if you want to draw to the 'screen', even if that's not
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* actually the screen, just draw to 0. This GLScreenBuffer class takes the
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* logic handling out of GLContext.
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*/
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#ifndef SCREEN_BUFFER_H_
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#define SCREEN_BUFFER_H_
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#include "GLTypes.h"
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#include "mozilla/gfx/Point.h"
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#include "mozilla/UniquePtr.h"
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#include <queue>
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#include <memory>
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namespace mozilla {
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namespace gl {
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class SharedSurface;
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class SurfaceFactory;
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class SwapChain;
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class SwapChainPresenter final {
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friend class SwapChain;
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SwapChain* mSwapChain;
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std::shared_ptr<SharedSurface> mBackBuffer;
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public:
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explicit SwapChainPresenter(SwapChain& swapChain);
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~SwapChainPresenter();
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const auto& BackBuffer() const { return mBackBuffer; }
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std::shared_ptr<SharedSurface> SwapBackBuffer(std::shared_ptr<SharedSurface>);
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GLuint Fb() const;
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};
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// -
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class SwapChain final {
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friend class SwapChainPresenter;
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public:
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UniquePtr<SurfaceFactory> mFactory;
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private:
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std::queue<std::shared_ptr<SharedSurface>> mPool;
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std::shared_ptr<SharedSurface> mFrontBuffer;
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public:
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std::shared_ptr<SharedSurface>
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mPrevFrontBuffer; // Hold this ref while it's in-flight.
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private:
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SwapChainPresenter* mPresenter = nullptr;
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public:
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SwapChain();
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virtual ~SwapChain();
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void ClearPool();
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const auto& FrontBuffer() const { return mFrontBuffer; }
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UniquePtr<SwapChainPresenter> Acquire(const gfx::IntSize&);
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};
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} // namespace gl
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} // namespace mozilla
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#endif // SCREEN_BUFFER_H_
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