texture uploading slow

Well as far as I know you may try to use separate thread for this, I haven't tried it myself, but it may help a bit.

Quote:

Original post by DMINATOR Well as far as I know you may try to use separate thread for this, I haven't tried it myself, but it may help a bit.

You'll run into major problems if you try updating a texture in a different thread than your rendering thread.

The best thing to do is upon startup, create and initialize several textures of various sizes, in your case a bunch of 256x256 textures. Then store them in some array. Create an corresponding array that contains flags to tell you whether or not that particular texture is in use.

Then when you need to allocate a texture, loop through your flag array looking for a texture that is not in use. If you find one, mark it as in use and retrieve the pointer to the texture object. Then call glTexSubImage2D to fill the texture with the needed data.

The basic point is that glTexSubImage2D is MUCH faster than glTexImage2D. glTexImage2D must allocate memory on the graphics card, while glTexSubImage2D does not, it simply assumes the memory has already been allocated.

Try this and it should solve all your problems.

that is an interesting idea, i will try that.

btw: i have about 200 (plus/minus 50) different 256-textures at runtime.

http://developer.nvidia.com/object/fast_texture_transfers.html

Basically use TexSubImage and avoid data swizzling. Use a PBO if this is an option.

[Edited by - nmi on January 29, 2007 3:34:52 PM]