void Options::setRefreshRate(uint refreshRate)
{
if (m_refreshRate == refreshRate) {
return;
}
m_refreshRate = refreshRate;
emit refreshRateChanged();
}
void QDecViewportItem::setRefreshRate(qint32 refreshRate)
{
m_updateTimer.stop();
if(refreshRate > 0) {
m_updateTimer.setInterval(refreshRate);
m_updateTimer.start();
}
m_refreshRate = refreshRate;
emit refreshRateChanged();
}
void QDecViewportItem::paint(QPainter *qPainter,
const QStyleOptionGraphicsItem *qStyle,
QWidget *qWidget)
{
Q_UNUSED(qStyle);
Q_UNUSED(qWidget);
if(!m_initViewport)
{
if(!m_initFailed)
{
// create the fbo
m_frameBufferObj =
new QGLFramebufferObject(width(),height(),
QGLFramebufferObject::CombinedDepthStencil, // play with this value?
GL_TEXTURE_2D,
GL_RGBA);
// run the implemented init method
this->initViewport();
if(m_initFailed)
{ return; }
// connect the timer
connect(&m_updateTimer,SIGNAL(timeout()),
this, SLOT(updateViewport()));
// start the timer if refreshRate is valid
if(m_refreshRate > 0) {
m_updateTimer.setInterval(m_refreshRate);
m_updateTimer.start();
}
emit refreshRateChanged();
m_initViewport = true;
}
else
{ return; }
}
QRectF localBounds = boundingRect();
QRectF sceneBounds = mapRectToScene(localBounds);
// notes:
// for some reason, this doesn't work unless
// we draw the texture to the fbo first, and
// *then* paint the fbo itself; so we're behind by
// a frame (but this isn't a big deal)
// if we do it the other way around, the context's
// paint engine gets disabled/null even if
// qPainter->paintEngine()->isActive() returns
// true, and QGL::Context will give us an error
// also, keep in mind that using an fbo like this
// every frame is pretty expensive, especially for
// a mobile target, so we may get slow downs
if(qPainter->paintEngine()->type() == QPaintEngine::OpenGL2 &&
qPainter->paintEngine()->isActive())
{
m_frameBufferObj->drawTexture(localBounds,
m_frameBufferObj->texture());
}
// beginNativePainting
// flushes the painting pipeline and prepares for the
// user issuing commands directly to the underlying
// graphics context:
// * blending is disabled
// * depth, stencil and scissor tests are disabled
// * active texture unit is reset to 0
// * depth mask, depth function and the clear depth
// are reset to their default values
// * stencil mask, stencil operation and stencil
// function are reset to their default values
// * current color is reset to solid white
// draw scene contents to the fbo
qPainter->beginNativePainting();
m_frameBufferObj->bind();
this->drawViewport();
m_frameBufferObj->release();
qPainter->endNativePainting();
}
