嗯.... 或許Colored MIPMAP會不會變慢有時候要看引擎特性....
不過去掉optimize的影響的話，這個部份影響不會超過5%。


比如說Toms引用的這段：
http://www.tomshardware.com/graphic...timized-07.html

xxx @ NVIDIA just pointed out that filling textures with a constant color/alpha might cause more pixels to be written to the framebuffer (passing alpha test), which could affect performance. Totally forgot about that one and I should probably change the code to leave the alpha channel alone for our next generation engine