In my simulation I may need to change the size of my textures *often*. Currently, what I do is if the size needs to change then: 1)delete texture 2)create it with glTexImage2D and re-load the new data onto it. The reason I do this is in case I frag the GPU memory. So my question is: if I don't delete the textures can I simply change the size of the textue using glTexImage2D and will the GPU handle all the memory usage issues? Or will it as I guessed result in messed up GPU memory. cheers

it's actually for GPGPU - so each texture is considered to be an array of data. These arrays change in size depending on the equations (fluid dynamics). They will change often. So back to my original question.
thanks anyhow