d89501a079
This improves file organization in kwin by putting backends in a single directory. It also makes easier to discover kwin's low level components for new contributors because the plugins directory may come as the last place to look for. When one hears "plugin", the first thing that comes to mind is regular plugins, not low level backends.
67 lines
1.5 KiB
C++
67 lines
1.5 KiB
C++
/*
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KWin - the KDE window manager
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This file is part of the KDE project.
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SPDX-FileCopyrightText: 2021 Xaver Hugl <xaver.hugl@gmail.com>
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SPDX-License-Identifier: GPL-2.0-or-later
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*/
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#include "dumb_swapchain.h"
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#include "drm_gpu.h"
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#include "logging.h"
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namespace KWin
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{
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DumbSwapchain::DumbSwapchain(DrmGpu *gpu, const QSize &size)
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: m_size(size)
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{
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for (int i = 0; i < 2; i++) {
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auto buffer = QSharedPointer<DrmDumbBuffer>::create(gpu, size);
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if (!buffer->bufferId()) {
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break;
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}
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if (!buffer->map()) {
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break;
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}
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buffer->image()->fill(Qt::black);
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m_slots.append(Slot{.buffer = buffer, .age = 0,});
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}
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if (m_slots.count() < 2) {
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qCWarning(KWIN_DRM) << "Failed to create dumb buffers for swapchain!";
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m_slots.clear();
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}
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}
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QSharedPointer<DrmDumbBuffer> DumbSwapchain::acquireBuffer(int *age)
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{
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if (m_slots.isEmpty()) {
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return nullptr;
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}
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index = (index + 1) % m_slots.count();
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if (age) {
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*age = m_slots[index].age;
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}
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return m_slots[index].buffer;
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}
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QSharedPointer<DrmDumbBuffer> DumbSwapchain::currentBuffer() const
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{
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return m_slots[index].buffer;
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}
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void DumbSwapchain::releaseBuffer(QSharedPointer<DrmDumbBuffer> buffer)
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{
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Q_ASSERT(m_slots[index].buffer == buffer);
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for (qsizetype i = 0; i < m_slots.count(); ++i) {
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if (m_slots[i].buffer == buffer) {
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m_slots[i].age = 1;
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} else if (m_slots[i].age > 0) {
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m_slots[i].age++;
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}
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}
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}
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}
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