PDA

View Full Version : problem with glReadPixels



jbreedlove
10-15-2001, 04:36 PM
Ok, this is really wierd. I'm trying to capture what is in my viewport to an RGB file by reading the pixels and then writing the data out to file. Initially I tried using reading as GL_RGBA, but I was getting a strange picture, so I read each color into a separate array (GL_RED, GL_GREEN, GL_BLUE and GL_ALPHA). But for some reason, the GL_BLUE values aren't correct when I write them out to file. The red, green and alpha are all fine, but the blue gives me this skewed picture... any clues?

jbreedlove
10-16-2001, 10:26 AM
Ok, I figured it out.. I have an SGI machine with a VR3 card in it, I was using their drivers and apparantly the driver was what was causing the problem. As soon as I switched to the NVIDIA driver for the Quadro, it worked great. And I wasted a day trying to figure that out.....

John