2的幂次幂纹理的效率高多少? [英] How much more efficient are power-of-two textures?

问题描述

我正在使用Ffmpeg创建OpenGL视频播放器，而我所有的视频都不是2的幂(因为它们是正常的视频分辨率).我的nvidia卡可以在fps上运行，但是我发现它不能在较旧的ATI卡上运行，因为它们不支持非二次幂纹理.

I am creating an OpenGL video player using Ffmpeg and all my videos aren't power of 2 (as they are normal video resolutions). It runs at fine fps with my nvidia card but I've found that it won't run on older ATI cards because they don't support non-power-of-two textures.

我只会在Nvidia卡上使用它，所以我不太在意ATI问题，但是我想知道如果textuers是2的幂，我将获得多少性能提升?值得将它们填充出来吗?

I will only be using this on an Nvidia card so I don't really care about the ATI problem too much but I was wondering how much of a performance boost I'd get if the textuers were power-of-2? Is it worth padding them out?

此外，如果值得的话，我该如何将它们填充到最接近的较大的2的幂数?

Also, if it is worth it, how do I go about padding them out to the nearest larger power-of-two?

推荐答案

编写视频播放器，您应该使用 glTexImage() 数据指针为NULL，然后填写数据.

Writing a video player you should update your texture content using glTexSubImage2D(). This function allows you to supply arbitarily sized images, that will be placed somewhere in the target texture. So you can initialize the texture first with a call of glTexImage() with the data pointer being NULL, then fill in the data.

2种纹理的纯能力的性能提升在很大程度上取决于所使用的硬件，但在极端情况下，可能高达300％.

The performance gain of pure power of 2 textures strongly depends on the hardware used, but in extreme cases it may be up to 300%.

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