Research And Implementation Of The 3D Graphics Clipping Algorithms In The GPU

With the rapid development of computer graphics,significant changes have taken place in China's electronic information industry.For the further research of graphics,human's sensory world have some more lifelike virtual physical impact.Considering the speed and performance,it is necessary to have a special processor for the complex scene to process a variety of graphics,so the study of the graphics processor is important.Graphics clipping is a key part in graphics processor,it can improve the speed of graphics processor to process graphics.The paper completed the module of three-dimensional clipping algorithm that based on fixed pipeline in the graphics processor.The three-dimensional clipping module is divided into three parts,including point clipping,line clipping,triangular clipping.The point segment clipping requires that vertex coordinates need meet the certain conditions to realized the design of the point clipping algorithm.The line segment primitive clipping is based on Liang Yongdong-Barsky line clipping algorithm.And the triangular clippings based on Sutherland-Hodgman polygon clipping algorithm.The three-dimensional clipping algorithm discussed in this paper is based on hardware implementation,and it satisfy the properties,such as low power consumption,small area.Besides,the three-dimensional clipping algorithm discussed in this paper is completed directly in the clipping cube,without the operation of perspective division,improved the clipping speed.The logic design adopts a way of combining the pipeline with the state machine,improved the graphics rendering speed.The function simulation and synthesis in the three types three-dimensional clipping algorithm indicated that results is corresponding with the actual theory clipping value,and it is consistent with the results of transformation of graphics.At the same time,the analysis of the power consumption,area report,timing report,all shows that meet the design requirements.This paper uses a fixed pipeline to realize the GPU rendering graphics design,it has a strategic meaning for the realization of the programmable pipeline and the unified architecture of rendering pipeline.