COMPUTER GRAPHICS SYSTEM WITH HIGH-PERFORMANCE PRIMITIVE CLIPPING PREPROCESSING

摘要

PROBLEM TO BE SOLVED: To obtain a shape accelerator for the computer graphics system which is improved in graphics primitive clipping. SOLUTION: A graphics processing circuit used by the graphics accelerator including the clipping processor is equipped with a vertex input data path 129 which is connected in an operable state to the vertex data input of the clipping processor. A clipping preprocessor 112 is equipped with the vertex data input connected in the operable state to the vertex input data path and control outputs 109 and 111 which are connected to an operable state to the control input of the clipping processor. The clipping preprocessor 112 evaluates the relation between primitive vertex data from the vertex input data path 129 and a clip area and gives a signal to the control outputs 109 and 111 according to the evaluation.