kwin/plugins/platforms/drm/egl_multi_backend.cpp

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/*
KWin - the KDE window manager
This file is part of the KDE project.
SPDX-FileCopyrightText: 2020 Xaver Hugl <xaver.hugl@gmail.com>
SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "egl_multi_backend.h"
#include "logging.h"
namespace KWin
{
EglMultiBackend::EglMultiBackend(AbstractEglDrmBackend *backend0) : OpenGLBackend()
{
m_backends.append(backend0);
setIsDirectRendering(true);
setSyncsToVBlank(true);
}
EglMultiBackend::~EglMultiBackend()
{
for (int i = 1; i < m_backends.count(); i++) {
delete m_backends[i];
}
// delete primary backend last, or this will crash!
delete m_backends[0];
}
void EglMultiBackend::init()
{
for (auto b : qAsConst(m_backends)) {
b->init();
}
// if any don't support it set it to not supported
setSupportsBufferAge(true);
setSupportsPartialUpdate(true);
setSupportsSwapBuffersWithDamage(true);
for (auto b : qAsConst(m_backends)) {
if (!b->supportsBufferAge()) {
setSupportsBufferAge(false);
}
if (!b->supportsPartialUpdate()) {
setSupportsPartialUpdate(false);
}
if (!b->supportsSwapBuffersWithDamage()) {
setSupportsSwapBuffersWithDamage(false);
}
}
// we only care about the rendering GPU here
setSupportsSurfacelessContext(m_backends[0]->supportsSurfacelessContext());
// these are client extensions and the same for all egl backends
setExtensions(m_backends[0]->extensions());
m_backends[0]->makeCurrent();
}
QRegion EglMultiBackend::beginFrame(int screenId)
{
int internalScreenId;
AbstractEglBackend *backend = findBackend(screenId, internalScreenId);
Q_ASSERT(backend != nullptr);
return backend->beginFrame(internalScreenId);
}
void EglMultiBackend::endFrame(int screenId, const QRegion &damage, const QRegion &damagedRegion)
{
int internalScreenId;
AbstractEglBackend *backend = findBackend(screenId, internalScreenId);
Q_ASSERT(backend != nullptr);
backend->endFrame(internalScreenId, damage, damagedRegion);
}
bool EglMultiBackend::makeCurrent()
{
return m_backends[0]->makeCurrent();
}
void EglMultiBackend::doneCurrent()
{
m_backends[0]->doneCurrent();
}
SceneOpenGLTexturePrivate *EglMultiBackend::createBackendTexture(SceneOpenGLTexture *texture)
{
return m_backends[0]->createBackendTexture(texture);
}
QSharedPointer<GLTexture> EglMultiBackend::textureForOutput(AbstractOutput *requestedOutput) const
{
// this assumes that the wrong backends return {}
for (auto backend : qAsConst(m_backends)) {
auto texture = backend->textureForOutput(requestedOutput);
if (!texture.isNull()) {
return texture;
}
}
return {};
}
bool EglMultiBackend::usesOverlayWindow() const
{
return false;
}
void EglMultiBackend::screenGeometryChanged(const QSize &size)
{
Q_UNUSED(size)
}
AbstractEglDrmBackend *EglMultiBackend::findBackend(int screenId, int& internalScreenId)
{
int screens = 0;
for (int i = 0; i < m_backends.count(); i++) {
if (screenId < screens + m_backends[i]->screenCount()) {
internalScreenId = screenId - screens;
return m_backends[i];
}
screens += m_backends[i]->screenCount();
}
qCDebug(KWIN_DRM) << "could not find backend!" << screenId << "/" << screens;
return nullptr;
}
void EglMultiBackend::addBackend(AbstractEglDrmBackend *backend)
{
m_backends.append(backend);
}
}