Add multitexture support for Alias models, and disable the multitexture

support for BSP models, until they can be fixed. gl_multitexture should now
actually be a speedup!

NOTE: Some OpenGL implementations have trouble with the texture function
used. 3Dfx Voodoo 1/2 are known to have this trouble. I don't know how to fix
this, or even if it can be fixed. :/

include/QF/GL/qf_vid.h

@@ -36,6 +36,7 @@
 // Multitexturing
 extern QF_glActiveTextureARB	qglActiveTexture;
 extern QF_glMultiTexCoord2fARB	qglMultiTexCoord2f;
+extern QF_glMultiTexCoord2fvARB	qglMultiTexCoord2fv;
 extern qboolean					gl_mtex_active;
 extern qboolean					gl_mtex_capable;
 extern GLenum					gl_mtex_enum;

libs/video/renderer/gl/gl_mod_alias.c

@@ -89,7 +89,6 @@ float		shadelight;
 float	   *shadedots = r_avertexnormal_dots[0];
 vec3_t		shadevector;
 
-
 static void
 GL_DrawAliasFrame (vert_order_t *vo)
 {
@@ -165,6 +164,47 @@ GL_DrawAliasFrame_fb (vert_order_t *vo)
 	}
 }
 
+static void
+GL_DrawAliasFrameMulti (vert_order_t *vo)
+{
+	float			color[4];
+	int				count;
+	int			   *order;
+	blended_vert_t *verts;
+
+	verts = vo->verts;
+	order = vo->order;
+
+	color[3] = modelalpha;
+	
+	while ((count = *order++)) {
+		// get the vertex count and primitive type
+		if (count < 0) {
+			count = -count;
+			qfglBegin (GL_TRIANGLE_FAN);
+		} else {
+			qfglBegin (GL_TRIANGLE_STRIP);
+		}
+
+		do {
+			// texture coordinates come from the draw list
+			qglMultiTexCoord2fv (gl_mtex_enum + 0, (float *) order);
+			qglMultiTexCoord2fv (gl_mtex_enum + 1, (float *) order);
+			order += 2;
+
+			// normals and vertexes come from the frame list
+			VectorScale (shadecolor, verts->lightdot, color);
+
+			qfglColor4fv (color);
+
+			qfglVertex3fv (verts->vert);
+			verts++;
+		} while (--count);
+
+		qfglEnd ();
+	}
+}
+
 /*
 	GL_DrawAliasShadow
 
@@ -544,8 +584,6 @@ R_DrawAliasModel (entity_t *e, qboolean cull)
 			fb_texture = skindesc->fb_texnum;
 	}
 
-	qfglBindTexture (GL_TEXTURE_2D, texture);
-
 	if (paliashdr->mdl.ident == POLYHEADER16)
 		vo = GL_GetAliasFrameVerts16 (e->frame, paliashdr, e);
 	else
@@ -554,13 +592,32 @@ R_DrawAliasModel (entity_t *e, qboolean cull)
 	if (modelalpha != 1.0)
 		qfglDepthMask (GL_FALSE);
 
+	if (!fb_texture) {	// Model has no fullbrights, don't bother with multi
+		qfglBindTexture (GL_TEXTURE_2D, texture);
+		GL_DrawAliasFrame (vo);
+	} else {	// try multitexture
+		if (gl_mtex_active) {	// set up the textures
+			qglActiveTexture (gl_mtex_enum + 0);
+			qfglBindTexture (GL_TEXTURE_2D, texture);
+
+			qglActiveTexture (gl_mtex_enum + 1);
+			qfglBindTexture (GL_TEXTURE_2D, fb_texture);
+			qfglTexEnvf (GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_DECAL);
+			qfglEnable (GL_TEXTURE_2D);
+
+			GL_DrawAliasFrameMulti (vo);	// do the heavy lifting
+
+			// restore the settings
+			qfglDisable (GL_TEXTURE_2D);
+			qglActiveTexture (gl_mtex_enum + 0);
+		} else {
+			qfglBindTexture (GL_TEXTURE_2D, texture);
 			GL_DrawAliasFrame (vo);
 
-	// This block is GL fullbright support for objects...
-	if (fb_texture) {
 			qfglBindTexture (GL_TEXTURE_2D, fb_texture);
 			GL_DrawAliasFrame_fb (vo);
 		}
+	}
 
 	if (modelalpha != 1.0)
 		qfglDepthMask (GL_TRUE);

libs/video/renderer/gl/gl_rsurf.c

@@ -262,11 +262,15 @@ R_BuildLightMap (msurface_t *surf, byte * dest, int stride)
 	stride -= smax * lightmap_bytes;
 	bl = blocklights;
 
+#if 0
 	if (gl_mtex_active) {
 		shift = 7;		// 0-1 lightmap range.
 	} else {
+#endif
 		shift = 8;		// 0-2 lightmap range.
+#if 0
 	}
+#endif
 
 	switch (lightmap_bytes) {
 	case 4:
@@ -367,6 +371,7 @@ GL_UploadLightmap (int i, int x, int y, int w, int h)
 	}
 }
 
+#if 0
 static void
 R_DrawMultitexturePoly (msurface_t *s)
 {
@@ -430,6 +435,7 @@ R_DrawMultitexturePoly (msurface_t *s)
 
 	qfglTexEnvf (GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
 }
+#endif
 
 static void
 R_BlendLightmaps (void)
@@ -704,8 +710,10 @@ R_DrawBrushModel (entity_t *e)
 			} else if (psurf->flags & SURF_DRAWSKY) {
 				CHAIN_SURF (psurf, sky_chain);
 				return;
+#if 0
 			} else if (gl_mtex_active) {
 				R_DrawMultitexturePoly (psurf);
+#endif
 			} else {
 				texture_t  *tex;
 				if (!psurf->texinfo->texture->anim_total)
@@ -722,7 +730,9 @@ R_DrawBrushModel (entity_t *e)
 		}
 	}
 
+#if 0
 	if (!gl_mtex_active)
+#endif
 		R_BlendLightmaps ();
 
 	if (gl_fb_bmodels->int_val)
@@ -794,8 +804,10 @@ R_RecursiveWorldNode (mnode_t *node)
 //					CHAIN_SURF (surf, waterchain);
 			} else if (surf->flags & SURF_DRAWSKY) {
 				CHAIN_SURF (surf, sky_chain);
+#if 0
 			} else if (gl_mtex_active) {
 				R_DrawMultitexturePoly (surf);
+#endif
 			} else {
 				texture_t  *tex;
 				if (!surf->texinfo->texture->anim_total)
@@ -841,7 +853,9 @@ R_DrawWorld (void)
 
 	DrawTextureChains ();
 
+#if 0
 	if (!gl_mtex_active)
+#endif
 		R_BlendLightmaps ();
 
 	if (gl_fb_bmodels->int_val)
@@ -1114,8 +1128,10 @@ GL_BuildLightmaps (model_t **models, int num_models)
 		}
 	}
 
+#if 0
 	if (gl_mtex_active)
 		qglActiveTexture (gl_mtex_enum + 1);
+#endif
 
 	// upload all lightmaps that were filled
 	for (i = 0; i < MAX_LIGHTMAPS; i++) {
@@ -1134,6 +1150,8 @@ GL_BuildLightmaps (model_t **models, int num_models)
 					  GL_UNSIGNED_BYTE, lightmaps[i]);
 	}
 
+#if 0
 	if (gl_mtex_active)
 		qglActiveTexture (gl_mtex_enum + 0);
+#endif
 }

libs/video/targets/vid_common_gl.c

@@ -63,6 +63,7 @@ unsigned int	d_8to24table[256];
 
 QF_glActiveTextureARB		qglActiveTexture = NULL;
 QF_glMultiTexCoord2fARB		qglMultiTexCoord2f = NULL;
+QF_glMultiTexCoord2fvARB	qglMultiTexCoord2fv = NULL;
 
 const char		   *gl_extensions;
 const char		   *gl_renderer;
@@ -138,8 +139,8 @@ CheckMultiTextureExtensions (void)
 		qfglGetIntegerv (GL_MAX_TEXTURE_UNITS_ARB, &max_texture_units);
 		if (max_texture_units >= 2) {
 			Con_Printf ("enabled, %d TMUs.\n", max_texture_units);
-			qglMultiTexCoord2f = QFGL_ExtensionAddress
+			qglMultiTexCoord2f = QFGL_ExtensionAddress ("glMultiTexCoord2fARB");
-				("glMultiTexCoord2fARB");
+			qglMultiTexCoord2fv = QFGL_ExtensionAddress ("glMultiTexCoord2fvARB");
 			qglActiveTexture = QFGL_ExtensionAddress ("glActiveTextureARB");
 			gl_mtex_enum = GL_TEXTURE0_ARB;
 			if (qglMultiTexCoord2f && gl_mtex_enum)