利用GLSL和OPENGL编写的阴影程序，此程序利用了PCF算法，使得阴影走样得到很好的解决-Prepared using GLSL and OPENGL shadow program, this program uses PCF algorithm, making the shadow aliasing been solved

opengl和glsl实现的纹理阴影，采用PCF对阴影进行多重采样，使阴影边缘平滑-opengl and glsl realization of the texture shadow, using PCF multiple sampling of the shadow, the shadow smooth edges