一种易于硬件实现的嵌入式GPU三角形光栅化算法  

An Embedded GPU Triangle Rasterization Algorithm for Hardware Implementation

作　　者：刘青楠 曾泽仓 杜慧敏 丁家隆 LIU Qing-nan;ZENG Ze-cang;DU Hui-min;DING Jia-long(School of electronic engineering,XI＇AN University of Posts ＆ telecommunications,Xi＇an,710121)

机构地区：[1]西安邮电大学电子工程学院,陕西西安710121

出　　处：《微电子学与计算机》2018年第9期26-31,共6页Microelectronics & Computer

基　　金：国家自然科学基金(61136002);西安市科技发展计划项目(CXY1440(10))

摘　　要：在嵌入式GPU中,三角形光栅化的性能是决定图形处理器性能的一个重要因素.传统的三角形光栅化算法需要处理大量的无关像素,会降低GPU的处理速度.本文针对采用瓦片渲染的嵌入式GPU,提出一种基于瓦片的递归的三角形光栅化算法,三角形光栅化会引起图形的几何走样,本文利用超级采样中的反走样算法,只用加法和移位实现了RGSS反走样算法.用C++语言实现了所提出的三角形光栅化及反走样算法.并在Xilinx zc706开发板上对算法进行了验证.结果表明,光栅化算法可完成对任意三角形的渲染,RGSS反走样算法处理后的三角形抗锯齿效果明显,该算法易于硬件实现,适用于采用瓦片渲染的嵌入式GPU中.In Embedded GPU,Triangle rasterization is an important factor in determining the performance of graphics processors.Traditional algorithms generate several redundant pixels and cut down the efficiency of GPU.A recursive triangular rasterization algorithm is proposed for tile-based embedded GPU.In addition,the triangular rasterization will cause the aliasing of the graph.The super-sampling anti-aliasing algorithm,RGSS,is used and implemented only by addition and shift operations.The C ＋ ＋ language is used to implement the triangular rasterization and anti-aliasing algorithm.The results show that the rasterization algorithm can complete the rendering of any triangle,and the triangular anti-aliasing effect of RGSS anti-aliasing algorithm is obvious.Antialiasing algorithm can significantly improve the rasterization of the anti-aliasing effect and suitable for using in tiled base rendering embedded GPU.

关 键 词：光栅化 边函数 瓦片 像素 反走样 

分 类 号：TP391.41[自动化与计算机技术—计算机应用技术]