Colored textured font

Graphics and GPU Programming Programming

Started by zedd July 21, 2001 06:15 PM

3 comments, last by zedd 22 years, 9 months ago

122

Author

July 21, 2001 06:15 PM

Hi I''m using textured font to draw text over my background scene. I use a black and white texture with anti-aliased characters and an alpha channel to make the black part transparent. It works fine but i''d like to be able to change the text color without having to load anything else (ie replace the white of the character by another color). Of course the text should still be blended correctly with the background. Is there a simple way to do this? thanks zedd

Elixir

122

July 21, 2001 06:28 PM

One of the common methods (and the way I do it) is to use vertex lighting. If you have a solid white texture and specify red light on it, it will turn it red (of course).

zedzeek

529

July 21, 2001 11:18 PM

provided u have the alpha channel of the etxture setup well
use
glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
glDisable( GL_LIGHTING )
glColor4f(1,0,0, 1) // for red
glEnable( GL_BLEND );
glBlendFunc( GL_SRC_ALPHA. GL_ONE_MINUS_SRC_ALPHA )

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zedd

122

Author

July 22, 2001 11:05 AM

hehe, i knew there was a simple solution, thanks zeek