基于OpenGL的反走样算法的分析与应用

Analysis and Application of Anti-aliasing Algorithms Based on OpenGL

计算机图形光栅化的过程中不可避免出现走样的现象。为了减轻图像的走样现象,需要在光栅化之后对图像进行反走样处理。当前各种反走样算法不足在于图形的阶梯状锯齿较为明显。通过分析几种反走样算法的原理,比较不同反走样算法的优缺点,结合当前的图形处理器,探讨利用Open GL图形库在VC++环境下基于混合反走样技术,对不同的图元进行反走样的操作,相对避免了现有方法所具有的局限性,具有非常快的速度和非常出色的视觉质量,有效解决走样问题。

Aliasing phenomenon is unavoidable during the process of computer graphics rasterization. In order to increase the quality of displayed image, it is necessary to anti-alias after the rasterization. Currently, the disadvantage of existing anti-aliasing technology is mainly the graphics ladder serrate problem. This paper analyzes several kinds of anti-aliasing algorithms, compares them by all advantages and disadvantages and combines algorithms with current graphics processor to explore the use of Open GL in VC＋＋ environment based on mixed anti-aliasing technology. This paper also operates anti-aliasing process among different primitives, which relatively avoids the limitation of existing method, guarantees extreme speed and high visual quality and for most, solves the aliasing problem effectively.