| 1 | // Copyright (C) 2024 The Qt Company Ltd. |
|---|---|
| 2 | // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only |
| 3 | |
| 4 | #include "qopenglvideobuffer_p.h" |
| 5 | |
| 6 | #include <qoffscreensurface.h> |
| 7 | #include <qthread.h> |
| 8 | #include <private/qimagevideobuffer_p.h> |
| 9 | |
| 10 | #include <QtOpenGL/private/qopenglcompositor_p.h> |
| 11 | #include <QtOpenGL/private/qopenglframebufferobject_p.h> |
| 12 | |
| 13 | QT_BEGIN_NAMESPACE |
| 14 | |
| 15 | static QOpenGLContext *createContext(QOpenGLContext *shareContext) |
| 16 | { |
| 17 | // Create an OpenGL context for the current thread. The lifetime of the context is tied to the |
| 18 | // lifetime of the current thread. |
| 19 | auto context = std::make_unique<QOpenGLContext>(); |
| 20 | context->setShareContext(shareContext); |
| 21 | |
| 22 | if (!context->create()) { |
| 23 | qWarning() << "Couldn't create an OpenGL context for QOpenGLVideoBuffer"; |
| 24 | return nullptr; |
| 25 | } |
| 26 | |
| 27 | QObject::connect(sender: QThread::currentThread(), signal: &QThread::finished, |
| 28 | context: context.get(), slot: &QOpenGLContext::deleteLater); |
| 29 | return context.release(); |
| 30 | } |
| 31 | |
| 32 | static bool setCurrentOpenGLContext() |
| 33 | { |
| 34 | auto compositorContext = QOpenGLCompositor::instance()->context(); |
| 35 | |
| 36 | // A thread-local variable is used to avoid creating a new context if we're called on the same |
| 37 | // thread. The context lifetime is tied to the current thread lifetime (see createContext()). |
| 38 | static thread_local QOpenGLContext *context = nullptr; |
| 39 | static thread_local QOffscreenSurface *surface = nullptr; |
| 40 | |
| 41 | if (!context) { |
| 42 | context = (compositorContext->thread() == QThread::currentThread()) |
| 43 | ? compositorContext |
| 44 | : createContext(shareContext: compositorContext); |
| 45 | |
| 46 | if (!context) |
| 47 | return false; |
| 48 | |
| 49 | surface = new QOffscreenSurface(nullptr, context); |
| 50 | surface->setFormat(context->format()); |
| 51 | surface->create(); |
| 52 | } |
| 53 | |
| 54 | return context->makeCurrent(surface); |
| 55 | } |
| 56 | |
| 57 | QOpenGLVideoBuffer::QOpenGLVideoBuffer(std::unique_ptr<QOpenGLFramebufferObject> fbo) |
| 58 | : QHwVideoBuffer(QVideoFrame::RhiTextureHandle), m_fbo(std::move(fbo)) |
| 59 | { |
| 60 | Q_ASSERT(m_fbo); |
| 61 | } |
| 62 | |
| 63 | QOpenGLVideoBuffer::~QOpenGLVideoBuffer() { } |
| 64 | |
| 65 | QAbstractVideoBuffer::MapData QOpenGLVideoBuffer::map(QVideoFrame::MapMode mode) |
| 66 | { |
| 67 | return ensureImageBuffer().map(mode); |
| 68 | } |
| 69 | |
| 70 | void QOpenGLVideoBuffer::unmap() |
| 71 | { |
| 72 | if (m_imageBuffer) |
| 73 | m_imageBuffer->unmap(); |
| 74 | } |
| 75 | |
| 76 | quint64 QOpenGLVideoBuffer::textureHandle(QRhi *, int plane) const |
| 77 | { |
| 78 | Q_UNUSED(plane); |
| 79 | return m_fbo->texture(); |
| 80 | } |
| 81 | |
| 82 | QImageVideoBuffer &QOpenGLVideoBuffer::ensureImageBuffer() |
| 83 | { |
| 84 | // Create image buffer if not yet created. |
| 85 | // This is protected by mapMutex in QVideoFrame::map. |
| 86 | if (!m_imageBuffer) { |
| 87 | if (!setCurrentOpenGLContext()) |
| 88 | qWarning() << "Failed to set current OpenGL context"; |
| 89 | |
| 90 | m_imageBuffer = std::make_unique<QImageVideoBuffer>(args: m_fbo->toImage(flipped: false)); |
| 91 | } |
| 92 | |
| 93 | return *m_imageBuffer; |
| 94 | } |
| 95 | |
| 96 | QT_END_NAMESPACE |
| 97 |