kwin/platformsupport/scenes/opengl/openglbackend.cpp
2021-02-02 13:26:43 +00:00

106 lines
2.3 KiB
C++

/*
KWin - the KDE window manager
This file is part of the KDE project.
SPDX-FileCopyrightText: 2006 Lubos Lunak <l.lunak@kde.org>
SPDX-FileCopyrightText: 2009, 2010, 2011 Martin Gräßlin <mgraesslin@kde.org>
SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "openglbackend.h"
#include <kwineffects.h>
#include <logging.h>
#include "screens.h"
#include <epoxy/gl.h>
namespace KWin
{
OpenGLBackend::OpenGLBackend()
: m_directRendering(false)
, m_haveBufferAge(false)
, m_failed(false)
{
}
OpenGLBackend::~OpenGLBackend()
{
}
void OpenGLBackend::setFailed(const QString &reason)
{
qCWarning(KWIN_OPENGL) << "Creating the OpenGL rendering failed: " << reason;
m_failed = true;
}
void OpenGLBackend::addToDamageHistory(const QRegion &region)
{
if (m_damageHistory.count() > 10)
m_damageHistory.removeLast();
m_damageHistory.prepend(region);
}
QRegion OpenGLBackend::accumulatedDamageHistory(int bufferAge) const
{
QRegion region;
// Note: An age of zero means the buffer contents are undefined
if (bufferAge > 0 && bufferAge <= m_damageHistory.count()) {
for (int i = 0; i < bufferAge - 1; i++)
region |= m_damageHistory[i];
} else {
const QSize &s = screens()->size();
region = QRegion(0, 0, s.width(), s.height());
}
return region;
}
OverlayWindow* OpenGLBackend::overlayWindow() const
{
return nullptr;
}
bool OpenGLBackend::scanout(int screenId, KWaylandServer::SurfaceInterface *surface)
{
Q_UNUSED(screenId)
Q_UNUSED(surface)
return false;
}
void OpenGLBackend::copyPixels(const QRegion &region)
{
const int height = screens()->size().height();
for (const QRect &r : region) {
const int x0 = r.x();
const int y0 = height - r.y() - r.height();
const int x1 = r.x() + r.width();
const int y1 = height - r.y();
glBlitFramebuffer(x0, y0, x1, y1, x0, y0, x1, y1, GL_COLOR_BUFFER_BIT, GL_NEAREST);
}
}
QSharedPointer<KWin::GLTexture> OpenGLBackend::textureForOutput(AbstractOutput* output) const
{
Q_UNUSED(output)
return {};
}
void OpenGLBackend::aboutToStartPainting(int screenId, const QRegion &damage)
{
Q_UNUSED(screenId)
Q_UNUSED(damage)
}
bool OpenGLBackend::directScanoutAllowed(int screen) const
{
Q_UNUSED(screen);
return false;
}
}