Initial revision

source/gl_refrag.c

@@ -0,0 +1,234 @@
+/*
+Copyright (C) 1996-1997 Id Software, Inc.
+
+This program is free software; you can redistribute it and/or
+modify it under the terms of the GNU General Public License
+as published by the Free Software Foundation; either version 2
+of the License, or (at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  
+
+See the GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program; if not, write to the Free Software
+Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+
+*/
+// r_efrag.c
+
+#include "quakedef.h"
+
+mnode_t	*r_pefragtopnode;
+
+
+//===========================================================================
+
+/*
+===============================================================================
+
+					ENTITY FRAGMENT FUNCTIONS
+
+===============================================================================
+*/
+
+efrag_t		**lastlink;
+
+vec3_t		r_emins, r_emaxs;
+
+entity_t	*r_addent;
+
+
+/*
+================
+R_RemoveEfrags
+
+Call when removing an object from the world or moving it to another position
+================
+*/
+void R_RemoveEfrags (entity_t *ent)
+{
+	efrag_t		*ef, *old, *walk, **prev;
+	
+	ef = ent->efrag;
+	
+	while (ef)
+	{
+		prev = &ef->leaf->efrags;
+		while (1)
+		{
+			walk = *prev;
+			if (!walk)
+				break;
+			if (walk == ef)
+			{	// remove this fragment
+				*prev = ef->leafnext;
+				break;
+			}
+			else
+				prev = &walk->leafnext;
+		}
+				
+		old = ef;
+		ef = ef->entnext;
+		
+	// put it on the free list
+		old->entnext = cl.free_efrags;
+		cl.free_efrags = old;
+	}
+	
+	ent->efrag = NULL; 
+}
+
+/*
+===================
+R_SplitEntityOnNode
+===================
+*/
+void R_SplitEntityOnNode (mnode_t *node)
+{
+	efrag_t		*ef;
+	mplane_t	*splitplane;
+	mleaf_t		*leaf;
+	int			sides;
+	
+	if (node->contents == CONTENTS_SOLID)
+	{
+		return;
+	}
+	
+// add an efrag if the node is a leaf
+
+	if ( node->contents < 0)
+	{
+		if (!r_pefragtopnode)
+			r_pefragtopnode = node;
+
+		leaf = (mleaf_t *)node;
+
+// grab an efrag off the free list
+		ef = cl.free_efrags;
+		if (!ef)
+		{
+			Con_Printf ("Too many efrags!\n");
+			return;		// no free fragments...
+		}
+		cl.free_efrags = cl.free_efrags->entnext;
+
+		ef->entity = r_addent;
+		
+// add the entity link	
+		*lastlink = ef;
+		lastlink = &ef->entnext;
+		ef->entnext = NULL;
+		
+// set the leaf links
+		ef->leaf = leaf;
+		ef->leafnext = leaf->efrags;
+		leaf->efrags = ef;
+			
+		return;
+	}
+	
+// NODE_MIXED
+
+	splitplane = node->plane;
+	sides = BOX_ON_PLANE_SIDE(r_emins, r_emaxs, splitplane);
+	
+	if (sides == 3)
+	{
+	// split on this plane
+	// if this is the first splitter of this bmodel, remember it
+		if (!r_pefragtopnode)
+			r_pefragtopnode = node;
+	}
+	
+// recurse down the contacted sides
+	if (sides & 1)
+		R_SplitEntityOnNode (node->children[0]);
+		
+	if (sides & 2)
+		R_SplitEntityOnNode (node->children[1]);
+}
+
+
+
+/*
+===========
+R_AddEfrags
+===========
+*/
+void R_AddEfrags (entity_t *ent)
+{
+	model_t		*entmodel;
+	int			i;
+		
+	if (!ent->model)
+		return;
+
+	r_addent = ent;
+			
+	lastlink = &ent->efrag;
+	r_pefragtopnode = NULL;
+	
+	entmodel = ent->model;
+
+	for (i=0 ; i<3 ; i++)
+	{
+		r_emins[i] = ent->origin[i] + entmodel->mins[i];
+		r_emaxs[i] = ent->origin[i] + entmodel->maxs[i];
+	}
+
+	R_SplitEntityOnNode (cl.worldmodel->nodes);
+
+	ent->topnode = r_pefragtopnode;
+}
+
+
+/*
+================
+R_StoreEfrags
+
+// FIXME: a lot of this goes away with edge-based
+================
+*/
+void R_StoreEfrags (efrag_t **ppefrag)
+{
+	entity_t	*pent;
+	model_t		*clmodel;
+	efrag_t		*pefrag;
+
+
+	while ((pefrag = *ppefrag) != NULL)
+	{
+		pent = pefrag->entity;
+		clmodel = pent->model;
+
+		switch (clmodel->type)
+		{
+		case mod_alias:
+		case mod_brush:
+		case mod_sprite:
+			pent = pefrag->entity;
+
+			if ((pent->visframe != r_framecount) &&
+				(cl_numvisedicts < MAX_VISEDICTS))
+			{
+				cl_visedicts[cl_numvisedicts++] = *pent;
+
+			// mark that we've recorded this entity for this frame
+				pent->visframe = r_framecount;
+			}
+
+			ppefrag = &pefrag->leafnext;
+			break;
+
+		default:	
+			Sys_Error ("R_StoreEfrags: Bad entity type %d\n", clmodel->type);
+		}
+	}
+}
+
+