Hi, all
I meet a problem. I am now using opengl to display a 3d model. For
certain reason I have to save the pixels of every frame into memory.
However the cost of glReadPixels is huge. So I want to downsample the
image and then output it from the buffer. I tried to use glPixelZoom
and glCopyPixels to zoom and copy the whole screen but it didn't work
because I don't know where to copy the pixel.
Anyway, does anyone know a method to output the screen pixels faster
or have a idea to zoom in the image in frame buffer.
Thanks!!!
