矩形纹理不能被压缩到PVRTC格式。
Rectangular textures can not be compressed to PVRTC formats.
绘制一个矩形选区，填充红色背景纹理之上的一层。
Draw a rectangular selection and fill it with red on a layer above the background texture.
唯一的区别是与深度缓存中深度值比较的不是来自矩形的深度，而是来自矩形的深度加上粒子纹理中储存的深度。
The only difference is that the depth compared with the depth buffer is not the depth from the quad, but the depth from the quad augmented by the depth stored in the particle texture.
应用推荐