How can I add overbright lighting to Quake engine?

[hondobondo]

Enhanced GlQuake is the only engine that can run SDQuake, besides Darkplaces, and I want to add overbrights to it? Any tuts?

[revelator]

i think mh had some code for that ?.

aye older release before mhquake went d3d controllable to as its used to replace the software gamma code.

[mh]

Simple enough for the world model. Just shift the lightmap by 8 (jnstead of by 7) in R_BuildLightmap, then use glBlendFunc (GL_DST_COLOR, GL_SRC_COLOR); in R_BlendLightmaps or a 2 x RGB combine instead of GL_MODULATE in R_DrawSequentialPoly. If those last items sound like too much you can double your palette values for mipmapped textures instead.

[mh]

Present for you Hondo.

Use gl_overbright 1 (default) to enable. Overbrights are only available if GL_ARB_texture_env_combine is also available. In general that means that they're available on everything aside from old first and second gen 3dfx cards (or other hardware of comparable age).

They could be easily added to the gl_texsort 1 path for brush models on this ancient hardware, as that doesn't depend on combine. Adding them to alias models needs a little more work though.

I've made the whole project Visual C++ 2008 friendly, and removed the need to use gas2masm (just added the generated .asm files to it; ml.exe comes with 2008). The WinQuake builds won't compile successfully though, and I didn't bother with fixing them.

Just search for the word "overbright" in the source and you'll find most of what you need.

Incidentally, there is a third engine that can run SDQuake.

[hondobondo]

[hondobondo]

[revelator]

[hondobondo]

[r00k]

[revelator]

[mh]

[revelator]

[hondobondo]

[mh]

[Baker]