I’m doing some simple tests to determine the size in memory
of a 3D texture.
I got these results from Video Memory Watcher.
A RGB 3D texture, 256256256 texels, using GL_RGB16F_ARB to store
it on the video memory, should take:
256256256*3(RGB)*2(16bits) = 96Mo
But, when binding the fbo, the free video memory amount decrease
by 254Mo (158Mo more than 96Mo)!
Does anybody know why?
I working on NVDIA 8800 GTX.
Thanks in advance