r_brush.c

void GL_BuildLightmaps (void)
{
	char	name[24];
	int		i, j;
	struct lightmap_s *lm;
	qmodel_t	*m;

	r_framecount = 1; // no dlightcache

	//Spike -- wipe out all the lightmap data (johnfitz -- the gltexture objects were already freed by Mod_ClearAll)
	for (i=0; i < lightmap_count; i++)
		free(lightmap[i].data);
	free(lightmap);
	lightmap = NULL;
	last_lightmap_allocated = 0;
	lightmap_count = 0;

	gl_lightmap_format = GL_RGBA;//FIXME: hardcoded for now!

	switch (gl_lightmap_format)
	{
	case GL_RGBA:
		lightmap_bytes = 4;
		break;
	case GL_BGRA:
		lightmap_bytes = 4;
		break;
	default:
		Sys_Error ("GL_BuildLightmaps: bad lightmap format");
	}

	for (j=1 ; j<MAX_MODELS ; j++)
	{
		m = cl.model_precache[j];
		if (!m)
			break;
		if (m->name[0] == '*')
			continue;
		r_pcurrentvertbase = m->vertexes;
		currentmodel = m;
		for (i=0 ; i<m->numsurfaces ; i++)
		{
			//johnfitz -- rewritten to use SURF_DRAWTILED instead of the sky/water flags
			//^ Lol
			if (m->surfaces[i].flags & SURF_DRAWSKY)
				continue;
			GL_CreateSurfaceLightmap(m->surfaces + i);
			BuildSurfaceDisplayList (m->surfaces + i);
			if (m->surfaces[i].flags & SURF_DRAWTILED)
				GL_SubdivideSurface(m->surfaces + i);
			//johnfitz
		}
	}

	//
	// upload all lightmaps that were filled
	//
	for (i=0; i<lightmap_count; i++)
	{
		lm = &lightmap[i];
		lm->modified = false;
		lm->rectchange.l = LMBLOCK_WIDTH;
		lm->rectchange.t = LMBLOCK_HEIGHT;
		lm->rectchange.w = 0;
		lm->rectchange.h = 0;

		//johnfitz -- use texture manager
		sprintf(name, "lightmap%07i",i);
		lm->texture = TexMgr_LoadImage (cl.worldmodel, name, LMBLOCK_WIDTH, LMBLOCK_HEIGHT,
						SRC_LIGHTMAP, lm->data, "", (src_offset_t)lm->data, TEXPREF_LINEAR | TEXPREF_NOPICMIP);
		//johnfitz
	}

	//johnfitz -- warn about exceeding old limits
	//GLQuake limit was 64 textures of 128x128. Estimate how many 128x128 textures we would need
	//given that we are using lightmap_count of LMBLOCK_WIDTH x LMBLOCK_HEIGHT
	i = lightmap_count * ((LMBLOCK_WIDTH / 128) * (LMBLOCK_HEIGHT / 128));
	if (i > 64)
		Con_DWarning("%i lightmaps exceeds standard limit of 64.\n",i);
	//johnfitz
}