[osg-users] [GL ES2] Add slave camera

[Jean Baptiste Poquelin]

Hi everyone,

Is it possible to add a slave camera in an embedded viewer? I am trying to perform "render-to-texture" in multiple cameras simultaneously and everything works fine until I try to add a slave camera on the viewer.

Here is the context (simplified):

Code:

// Create an X11/EGL display/context
...

// Create a viewer
viewer = new osgViewer::Viewer();
osg::ref_ptr<osgViewer::GraphicsWindow> graphics_window = viewer->setUpViewerAsEmbeddedInWindow(0, 0, 640, 480);

// Create a texture
texture = new osg::Texture2D;
texture->setTextureSize(640, 480);
texture->setInternalFormat(GL_RGBA);
texture->setSourceFormat(GL_RGBA);
texture->setSourceType(GL_FLOAT);
texture->setFilter(osg::Texture2D::MIN_FILTER, osg::Texture2D::LINEAR);
texture->setFilter(osg::Texture2D::MAG_FILTER, osg::Texture2D::LINEAR);
texture->setWrap(osg::Texture2D::WRAP_S, osg::Texture2D::CLAMP_TO_EDGE);
texture->setWrap(osg::Texture2D::WRAP_T, osg::Texture2D::CLAMP_TO_EDGE);

// Create a camera
camera = new osg::Camera;
camera->setViewport(0, 0, texture->getTextureWidth(), texture->getTextureHeight());
camera->setClearColor(osg::Vec4(1.0f, 1.0f, 1.0f, 0.0f));
camera->setClearMask(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
camera->setRenderOrder(osg::Camera::PRE_RENDER);
camera->setRenderTargetImplementation(osg::Camera::FRAME_BUFFER_OBJECT);
camera->setReferenceFrame(osg::Camera::ABSOLUTE_RF);

// Attach texture to camera
camera->attach(osg::Camera::COLOR_BUFFER, texture);

// Bind the texture object
osg::State &state = *graphics_window->getState();
texture->apply(state);

// Load the camera
viewer->addSlave(camera->get());




The last call fails with the message: free(): invalid pointer
Am I missing something?

Thank you!

Cheers,
Jean

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Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=63701#63701