| 1 | // Copyright (C) 2024 The Qt Company Ltd. |
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| 2 | // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only |
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| 3 | |
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| 4 | #include "qopenglvideobuffer_p.h" |
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| 5 | |
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| 6 | #include <qoffscreensurface.h> |
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| 7 | #include <qthread.h> |
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| 8 | #include <private/qimagevideobuffer_p.h> |
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| 9 | |
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| 10 | #include <QtOpenGL/private/qopenglcompositor_p.h> |
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| 11 | #include <QtOpenGL/private/qopenglframebufferobject_p.h> |
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| 12 | |
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| 13 | QT_BEGIN_NAMESPACE |
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| 14 | |
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| 15 | static QOpenGLContext *createContext(QOpenGLContext *shareContext) |
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| 16 | { |
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| 17 | // Create an OpenGL context for the current thread. The lifetime of the context is tied to the |
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| 18 | // lifetime of the current thread. |
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| 19 | auto context = std::make_unique<QOpenGLContext>(); |
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| 20 | context->setShareContext(shareContext); |
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| 21 | |
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| 22 | if (!context->create()) { |
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| 23 | qWarning() << "Couldn't create an OpenGL context for QOpenGLVideoBuffer" ; |
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| 24 | return nullptr; |
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| 25 | } |
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| 26 | |
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| 27 | QObject::connect(sender: QThread::currentThread(), signal: &QThread::finished, |
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| 28 | context: context.get(), slot: &QOpenGLContext::deleteLater); |
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| 29 | return context.release(); |
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| 30 | } |
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| 31 | |
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| 32 | static bool setCurrentOpenGLContext() |
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| 33 | { |
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| 34 | auto compositorContext = QOpenGLCompositor::instance()->context(); |
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| 35 | |
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| 36 | // A thread-local variable is used to avoid creating a new context if we're called on the same |
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| 37 | // thread. The context lifetime is tied to the current thread lifetime (see createContext()). |
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| 38 | static thread_local QOpenGLContext *context = nullptr; |
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| 39 | static thread_local QOffscreenSurface *surface = nullptr; |
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| 40 | |
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| 41 | if (!context) { |
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| 42 | context = compositorContext->thread()->isCurrentThread() ? compositorContext |
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| 43 | : createContext(shareContext: compositorContext); |
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| 44 | |
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| 45 | if (!context) |
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| 46 | return false; |
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| 47 | |
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| 48 | surface = new QOffscreenSurface(nullptr, context); |
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| 49 | surface->setFormat(context->format()); |
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| 50 | surface->create(); |
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| 51 | } |
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| 52 | |
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| 53 | return context->makeCurrent(surface); |
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| 54 | } |
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| 55 | |
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| 56 | QOpenGLVideoBuffer::QOpenGLVideoBuffer(std::unique_ptr<QOpenGLFramebufferObject> fbo) |
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| 57 | : QHwVideoBuffer(QVideoFrame::RhiTextureHandle), m_fbo(std::move(fbo)) |
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| 58 | { |
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| 59 | Q_ASSERT(m_fbo); |
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| 60 | } |
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| 61 | |
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| 62 | QOpenGLVideoBuffer::~QOpenGLVideoBuffer() = default; |
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| 63 | |
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| 64 | QAbstractVideoBuffer::MapData QOpenGLVideoBuffer::map(QVideoFrame::MapMode mode) |
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| 65 | { |
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| 66 | return ensureImageBuffer().map(mode); |
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| 67 | } |
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| 68 | |
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| 69 | void QOpenGLVideoBuffer::unmap() |
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| 70 | { |
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| 71 | if (m_imageBuffer) |
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| 72 | m_imageBuffer->unmap(); |
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| 73 | } |
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| 74 | |
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| 75 | quint64 QOpenGLVideoBuffer::textureHandle(QRhi &, int plane) |
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| 76 | { |
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| 77 | Q_UNUSED(plane); |
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| 78 | return m_fbo->texture(); |
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| 79 | } |
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| 80 | |
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| 81 | QImageVideoBuffer &QOpenGLVideoBuffer::ensureImageBuffer() |
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| 82 | { |
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| 83 | // Create image buffer if not yet created. |
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| 84 | // This is protected by mapMutex in QVideoFrame::map. |
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| 85 | if (!m_imageBuffer) { |
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| 86 | if (!setCurrentOpenGLContext()) |
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| 87 | qWarning() << "Failed to set current OpenGL context" ; |
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| 88 | |
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| 89 | m_imageBuffer = std::make_unique<QImageVideoBuffer>(args: m_fbo->toImage(flipped: false)); |
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| 90 | } |
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| 91 | |
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| 92 | return *m_imageBuffer; |
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| 93 | } |
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| 94 | |
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| 95 | QT_END_NAMESPACE |
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| 96 | |
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