void RenderingManager::screenshot(osg::Image *image, int w, int h)
{
osg::ref_ptr<osg::Camera> rttCamera (new osg::Camera);
rttCamera->setNodeMask(Mask_RenderToTexture);
rttCamera->attach(osg::Camera::COLOR_BUFFER, image);
rttCamera->setRenderOrder(osg::Camera::PRE_RENDER);
rttCamera->setReferenceFrame(osg::Camera::ABSOLUTE_RF);
rttCamera->setRenderTargetImplementation(osg::Camera::FRAME_BUFFER_OBJECT, osg::Camera::PIXEL_BUFFER_RTT);
rttCamera->setProjectionMatrixAsPerspective(mFieldOfView, w/float(h), mNearClip, mViewDistance);
rttCamera->setViewMatrix(mViewer->getCamera()->getViewMatrix());
rttCamera->setViewport(0, 0, w, h);
osg::ref_ptr<osg::Texture2D> texture (new osg::Texture2D);
texture->setInternalFormat(GL_RGB);
texture->setTextureSize(w, h);
texture->setResizeNonPowerOfTwoHint(false);
texture->setFilter(osg::Texture::MIN_FILTER, osg::Texture::LINEAR);
texture->setFilter(osg::Texture::MAG_FILTER, osg::Texture::LINEAR);
rttCamera->attach(osg::Camera::COLOR_BUFFER, texture);
image->setDataType(GL_UNSIGNED_BYTE);
image->setPixelFormat(texture->getInternalFormat());
rttCamera->setUpdateCallback(new NoTraverseCallback);
rttCamera->addChild(mLightRoot);
rttCamera->setCullMask(mViewer->getCamera()->getCullMask() & (~Mask_GUI));
mRootNode->addChild(rttCamera);
// The draw needs to complete before we can copy back our image.
osg::ref_ptr<NotifyDrawCompletedCallback> callback (new NotifyDrawCompletedCallback);
rttCamera->setFinalDrawCallback(callback);
// at the time this function is called we are in the middle of a frame,
// so out of order calls are necessary to get a correct frameNumber for the next frame.
// refer to the advance() and frame() order in Engine::go()
mViewer->eventTraversal();
mViewer->updateTraversal();
mViewer->renderingTraversals();
callback->waitTillDone();
// now that we've "used up" the current frame, get a fresh framenumber for the next frame() following after the screenshot is completed
mViewer->advance(mViewer->getFrameStamp()->getSimulationTime());
rttCamera->removeChildren(0, rttCamera->getNumChildren());
rttCamera->setGraphicsContext(NULL);
mRootNode->removeChild(rttCamera);
}
void RenderingManager::screenshot(osg::Image *image, int w, int h)
{
osg::ref_ptr<osg::Camera> rttCamera (new osg::Camera);
rttCamera->setNodeMask(Mask_RenderToTexture);
rttCamera->attach(osg::Camera::COLOR_BUFFER, image);
rttCamera->setRenderOrder(osg::Camera::PRE_RENDER);
rttCamera->setReferenceFrame(osg::Camera::ABSOLUTE_RF);
rttCamera->setRenderTargetImplementation(osg::Camera::FRAME_BUFFER_OBJECT, osg::Camera::PIXEL_BUFFER_RTT);
rttCamera->setClearColor(mViewer->getCamera()->getClearColor());
rttCamera->setClearMask(mViewer->getCamera()->getClearMask());
rttCamera->setProjectionMatrixAsPerspective(mFieldOfView, w/float(h), mNearClip, mViewDistance);
rttCamera->setViewMatrix(mViewer->getCamera()->getViewMatrix());
rttCamera->setViewport(0, 0, w, h);
rttCamera->setGraphicsContext(mViewer->getCamera()->getGraphicsContext());
osg::ref_ptr<osg::Texture2D> texture (new osg::Texture2D);
texture->setInternalFormat(GL_RGB);
texture->setTextureSize(w, h);
texture->setResizeNonPowerOfTwoHint(false);
rttCamera->attach(osg::Camera::COLOR_BUFFER, texture);
image->setDataType(GL_UNSIGNED_BYTE);
image->setPixelFormat(texture->getInternalFormat());
rttCamera->addChild(mLightRoot);
rttCamera->setCullMask(mViewer->getCamera()->getCullMask() & (~Mask_GUI));
mRootNode->addChild(rttCamera);
// The draw needs to complete before we can copy back our image.
osg::ref_ptr<NotifyDrawCompletedCallback> callback (new NotifyDrawCompletedCallback);
rttCamera->setFinalDrawCallback(callback);
mViewer->frame(mViewer->getFrameStamp()->getSimulationTime());
callback->waitTillDone();
rttCamera->removeChildren(0, rttCamera->getNumChildren());
rttCamera->setGraphicsContext(NULL);
mRootNode->removeChild(rttCamera);
}
