View Full Version : copying pixels between textures

01-03-2001, 05:39 AM
is it possible to allow the glCopyPixels() to copy pixels between textures and the framebuffer? it should not have a problem if the textures are resident.

01-03-2001, 09:10 PM
The right way to do this is almost certainly drawing a textured quad that renders the desired texels into the framebuffer.


01-07-2001, 07:33 PM
-texture to framebuffer: draw a quad.
-framebuffer to texture: glCopyTexImage,glCopyTexSubImage (this functions are not optimized in all hardware implementations, but in my GeForce2 the work really fast).

Anyway, this is not a suggestion to future opengl releases. A valid suggestion in this direction would be to have hardware rendering to offscreen buffers or to textures directly (without having to draw to the frame buffer first). This would be a very powerfull new toy for us.

[This message has been edited by coco (edited 01-07-2001).]