View Full Version : doubling color in back buffer?

08-08-2002, 01:57 PM
Is there an easy way that I can double the color in the back buffer? ie, if the color stored in the back buffer was (.5, .5, .25) it would become (1, 1, .5) after a blending operation? The best that I can find is to do glBlendFunc (GL_DST_COLOR, GL_DST_COLOR) to try to add the dst color to itself, however this is not yielding the proper results.

Thanks for any help!

08-08-2002, 11:17 PM
hum yes, that will be wrong..
that results in (src_color*Dest_color)+(Dest_color*Dest_color)

you want (1*dst_color)+(1*dst_color) that is
glBlendFunc (GL_DST_COLOR, GL_ONE); and glColor3f(1,1,1) and no light/texture or whatever can affect the source color

edit: forgot to mention, you should draw the white quad allover the area that you want to double

[This message has been edited by Mazy (edited 08-09-2002).]