1. A stereo graphics system, comprising: a master pipeline, receiving graphics data, rendering a first image, and deriving a depth image relating to the first image triggered by a graphics application; a rendering unit, coupled to the master pipeline, accessing the first image and the depth image from the master pipeline and rendering a second image for another view derived from the first image and the depth image; a first frame buffer, coupled to the master pipeline, retrieving and storing the first image; a second frame buffer, coupled to the rendering unit, retrieving and storing the second image; and a compositor, coupled to the first and second frame buffers, accessing the first and second images from the first and second frame buffers and combine the images to generate a resulting image, wherein the rendering unit draws a bounding box and transmits the bounding box to the master pipeline if an occluded area for the first and second images is detected, and the master pipeline renders the occluded area based on the bounding box.