screentransform.h

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/*
    KWin - the KDE window manager
    This file is part of the KDE project.
 
    SPDX-FileCopyrightText: 2021 Aleix Pol Gonzalez <aleixpol@kde.org>
 
    SPDX-License-Identifier: GPL-2.0-or-later
*/
#pragma once
 
#include "core/output.h"
#include "effect/effect.h"
#include "effect/timeline.h"
 
namespace KWin
{
class GLFramebuffer;
class GLShader;
class GLTexture;
 
class ScreenTransformEffect : public Effect
{
    Q_OBJECT
 
public:
    ScreenTransformEffect();
    ~ScreenTransformEffect() override;
 
    void prePaintScreen(ScreenPrePaintData &data, std::chrono::milliseconds presentTime) override;
    void paintScreen(const RenderTarget &renderTarget, const RenderViewport &viewport, int mask, const QRegion &region, KWin::Output *screen) override;
 
    bool isActive() const override;
 
    int requestedEffectChainPosition() const override
    {
        return 99;
    }
    static bool supported();
 
private:
    struct Snapshot
    {
        std::shared_ptr<GLTexture> texture;
        std::shared_ptr<GLFramebuffer> framebuffer;
    };
 
    struct ScreenState
    {
        TimeLine m_timeLine;
        Snapshot m_prev;
        Snapshot m_current;
        QRect m_oldGeometry;
        OutputTransform m_oldTransform;
        qreal m_angle = 0;
    };
 
    void addScreen(Output *screen);
    void removeScreen(Output *screen);
 
    QHash<Output *, ScreenState> m_states;
 
    std::unique_ptr<GLShader> m_shader;
    int m_previousTextureLocation = -1;
    int m_currentTextureLocation = -1;
    int m_modelViewProjectioMatrixLocation = -1;
    int m_blendFactorLocation = -1;
    bool m_capturing = false;
};
 
} // namespace KWin