wayland_egl_backend.h

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/*
    KWin - the KDE window manager
    This file is part of the KDE project.
 
    SPDX-FileCopyrightText: 2013 Martin Gräßlin <mgraesslin@kde.org>
    SPDX-FileCopyrightText: 2019 Roman Gilg <subdiff@gmail.com>
 
    SPDX-License-Identifier: GPL-2.0-or-later
*/
#pragma once
 
#include "core/outputlayer.h"
#include "platformsupport/scenes/opengl/abstract_egl_backend.h"
#include "utils/damagejournal.h"
 
#include <memory>
 
struct wl_buffer;
 
namespace KWin
{
class EglSwapchainSlot;
class EglSwapchain;
class GLFramebuffer;
class GraphicsBufferAllocator;
class GLRenderTimeQuery;
 
namespace Wayland
{
class WaylandBackend;
class WaylandOutput;
class WaylandEglBackend;
 
class WaylandEglPrimaryLayer : public OutputLayer
{
public:
    WaylandEglPrimaryLayer(WaylandOutput *output, WaylandEglBackend *backend);
    ~WaylandEglPrimaryLayer() override;
 
    GLFramebuffer *fbo() const;
    std::shared_ptr<GLTexture> texture() const;
    void present();
 
    std::optional<OutputLayerBeginFrameInfo> beginFrame() override;
    bool endFrame(const QRegion &renderedRegion, const QRegion &damagedRegion) override;
    std::chrono::nanoseconds queryRenderTime() const override;
    bool scanout(SurfaceItem *surfaceItem) override;
 
private:
    WaylandOutput *m_waylandOutput;
    DamageJournal m_damageJournal;
    std::shared_ptr<EglSwapchain> m_swapchain;
    std::shared_ptr<EglSwapchainSlot> m_buffer;
    std::unique_ptr<GLRenderTimeQuery> m_query;
    WaylandEglBackend *const m_backend;
    wl_buffer *m_presentationBuffer = nullptr;
 
    friend class WaylandEglBackend;
};
 
class WaylandEglCursorLayer : public OutputLayer
{
    Q_OBJECT
 
public:
    WaylandEglCursorLayer(WaylandOutput *output, WaylandEglBackend *backend);
    ~WaylandEglCursorLayer() override;
 
    std::optional<OutputLayerBeginFrameInfo> beginFrame() override;
    bool endFrame(const QRegion &renderedRegion, const QRegion &damagedRegion) override;
    std::chrono::nanoseconds queryRenderTime() const override;
 
private:
    WaylandOutput *m_output;
    WaylandEglBackend *m_backend;
    std::shared_ptr<EglSwapchain> m_swapchain;
    std::shared_ptr<EglSwapchainSlot> m_buffer;
    std::unique_ptr<GLRenderTimeQuery> m_query;
};
 
class WaylandEglBackend : public AbstractEglBackend
{
    Q_OBJECT
public:
    WaylandEglBackend(WaylandBackend *b);
    ~WaylandEglBackend() override;
 
    WaylandBackend *backend() const;
    GraphicsBufferAllocator *graphicsBufferAllocator() const override;
 
    std::unique_ptr<SurfaceTexture> createSurfaceTextureWayland(SurfacePixmap *pixmap) override;
 
    void init() override;
    void present(Output *output, const std::shared_ptr<OutputFrame> &frame) override;
    OutputLayer *primaryLayer(Output *output) override;
    OutputLayer *cursorLayer(Output *output) override;
 
    std::pair<std::shared_ptr<KWin::GLTexture>, ColorDescription> textureForOutput(KWin::Output *output) const override;
 
private:
    bool initializeEgl();
    bool initRenderingContext();
    bool createEglWaylandOutput(Output *output);
    void cleanupSurfaces() override;
 
    struct Layers
    {
        std::unique_ptr<WaylandEglPrimaryLayer> primaryLayer;
        std::unique_ptr<WaylandEglCursorLayer> cursorLayer;
    };
 
    WaylandBackend *m_backend;
    std::unique_ptr<GraphicsBufferAllocator> m_allocator;
    std::map<Output *, Layers> m_outputs;
};
 
} // namespace Wayland
} // namespace KWin