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glReadPixels

Started by dasan11 Jun 6, 2006 at 8:53 PM 2 replies 1k views

Original Post

Jun 6, 2006 at 8:53 PM

I first use glReadPixels to read the pixels into the memory. Then I use glDrawPixels to draw the pixels on the screen. But I find the color of the picture is just white and black. why? glColor3f(1.0,0.0,0.0);//////////red glBegin();//////////////draw the graphics glVertex3f(); ... glEnd(); glReadPixels(); glDrawPixels(); glSwapBuffers();

Kalidor

Jun 7, 2006 at 11:38 AM

Quote:
Original post by dasan11
I first use glReadPixels to read the pixels into the memory.
Then I use glDrawPixels to draw the pixels on the screen.
But I find the color of the picture is just white and black.
why?

glColor3f(1.0,0.0,0.0);//////////red
glBegin();//////////////draw the graphics
glVertex3f();
...
glEnd();
glReadPixels();
glDrawPixels();
glSwapBuffers();

Because you're using weird functions that take no parameters. Post your actual code (including parameters) and we might be able to see what's wrong.

DIB

Jun 8, 2006 at 7:57 AM

You may not have correctly set your pixel transfer mode for either the capture of the buffer or the display of the buffer. Just a thought.

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