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Re: Bitmap fonts with SDL / OpenGL
karx11erx
Guest
Post Posted: Wed Jan 11, 2006 6:14 pm
Quote:

Hi,

I'm planning to use SDL with OpenGL but one thing I'm
a bit unclear about is the best way to overlay my
OpenGL view with bitmap images and bitmap fonts. I've
been using my own bitmap fonts with SDL and overlaying
images using colorKeys. Is there a fairly simple way
to be able to do a similar thing when using SDL with
OpenGL?

I'd like to have a 3D openGL view and then overlay
some text and bitmap images over the 3D view. I'm
using Dev C++ with Windows XP.

Thanks,

Guilherme


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If you are using palettized bitmaps, create a corresponding RGBA image from your
bitmap with alpha = 0 where the transparent pixels are. If the bitmaps are
already RGB, replace the transparent pixels' color with black (0,0,0) and set
their alpha to 0 again in the RGBA texture. Then load the texture up to OpenGL.

You don't need to use ortho view to render your fonts, just set blend mode to
GL_ALWAYS and disable depth checking.

Guilherme De Sousa <g_hds <at> yahoo.co.uk> writes: