Psychtoolbox>Screen.{mex*} subfunction

Try to preload textures into VRAM to facilitate fast drawing. This method tries
to upload textures into the local (and fast) VRAM of your graphics hardware
before start of trial. This can reduce texture drawing time by avoiding the
upload delay. “windowPtr” Handle for onscreen window whose textures should be
preloaded. “texids” is a vector which contains the texture handles of all
textures which should be preloaded into VRAM. If no vector is given, PTB tries
to preload all textures into VRAM. The return value ‘resident’ tells you, if all
requested textures could be preloaded. A value of 1 means full success. The
‘texidresident’ vector tells you for each texture, if that specific texture
could be preloaded. Preloading requested textures can fail if your gfx-hardware
has an insufficient amount of free VRAM memory.

###See also: MakeTexture DrawTexture GetMovieImage