canvasrendernode.cpp 4.06 KiB
/****************************************************************************
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** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).
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** This file is part of the QtCanvas3D module of the Qt Toolkit.
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#include "canvasrendernode_p.h"
#include "canvas3d_p.h"
#include <QtGui/QOpenGLContext>
#include <QtGui/QOpenGLFramebufferObject>
CanvasRenderNode::CanvasRenderNode(Canvas *canvas, QQuickWindow *window) :
    QObject(),
    QSGSimpleTextureNode(),
    m_canvas(canvas),
    m_id(0),
    m_size(0,0),
    m_texture(0),
    m_window(window)
    if (m_canvas->logAllCalls()) qDebug() << "CanvasRenderNode::" << __FUNCTION__;
    // Our texture node must have a texture, so use the default 0 texture.
    m_texture = m_window->createTextureFromId(0, QSize(1, 1));
    setTexture(m_texture);
    setFiltering(QSGTexture::Linear);
    setTextureCoordinatesTransform(QSGSimpleTextureNode::MirrorVertically);
CanvasRenderNode::~CanvasRenderNode()
    if (m_canvas->logAllCalls()) qDebug() << "CanvasRenderNode::" << __FUNCTION__;
    delete m_texture;
void CanvasRenderNode::newTexture(int id, const QSize &size)
    if (m_canvas->logAllCalls()) qDebug() << "CanvasRenderNode::" << __FUNCTION__ << "(" << id << ", " << size << ")";
    m_mutex.lock();
    m_id = id;
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m_size = size; m_mutex.unlock(); // We cannot call QQuickWindow::update directly here, as this is only allowed // from the rendering thread or GUI thread. emit pendingNewTexture(); } // Before the scene graph starts to render, we update to the pending texture void CanvasRenderNode::prepareNode() { if (m_canvas->logAllCalls()) qDebug() << "CanvasRenderNode::" << __FUNCTION__; m_mutex.lock(); int newId = m_id; QSize size = m_size; m_id = 0; m_mutex.unlock(); if (newId) { if (m_canvas->logAllCalls()) qDebug() << "CanvasRenderNode::" << __FUNCTION__ << " showing new texture:" << newId << " size:" << size << " targetRect:" << rect(); delete m_texture; m_texture = m_window->createTextureFromId(newId, size); setTexture(m_texture); if (m_canvas->logAllCalls()) qDebug() << "CanvasRenderNode::" << __FUNCTION__ << " SGTexture size:" << m_texture->textureSize() << " normalizedTextureSubRect:" << m_texture->normalizedTextureSubRect(); // This will notify the main thread that the texture is now being rendered // and it can start rendering to the other one. emit textureInUse(); } else { if (m_canvas->logAllCalls()) qDebug() << "CanvasRenderNode::" << __FUNCTION__ << " showing previous texture"; } }