3D GRAPHICS RENDERING ENGINE FOR PROCESSING AN INVISIBLE FRAGMENT AND METHOD THEREOF

摘要

A 3D(three-dimensional) graphics rendering engine and a rendering method are provided to reduce a memory bandwidth in the 3D graphics rendering engine. An internal memory device(117) stores data. A pixel interpolating circuit(111) receives 3D information and creates data for pixels within a triangle based on the received 3D information. A texel interpolating circuit(113) creates data for coordinates within the triangle in response to an output signal of the pixel interpolating circuit. A depth filtering circuit(115) includes n depth filters positioned on a z-axis in a 3D space. The depth filtering circuit primarily compares a depth value in the 3D space of each of fragments forming a first object being rasterized with a depth value of each of the n depth filters, stores data corresponding to each of the fragments of the first object in the internal memory device using the primary comparison result, secondarily compares a depth value of each of fragments of a second object being rasterized with the depth value of each of the n depth filters, removes a fragment from the fragments of the second object overlapping a fragment of the first object using the data stored in the storage device and the secondary comparison result after rasterizing the first object and outputs the fragments of the first object and the fragments of the second object.