1 files changed, 427 insertions, 0 deletions
diff --git a/apps/plugins/sdl/progs/quake/sv_move.c b/apps/plugins/sdl/progs/quake/sv_move.c
new file mode 100644
index 0000000..a0078b9
--- /dev/null
+++ b/apps/plugins/sdl/progs/quake/sv_move.c
@@ -0,0 +1,427 @@
+/*
+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.
+
+*/
+// sv_move.c -- monster movement
+
+#include "quakedef.h"
+
+#define	STEPSIZE	18
+
+/*
+=============
+SV_CheckBottom
+
+Returns false if any part of the bottom of the entity is off an edge that
+is not a staircase.
+
+=============
+*/
+int c_yes, c_no;
+
+qboolean SV_CheckBottom (edict_t *ent)
+{
+	vec3_t	mins, maxs, start, stop;
+	trace_t	trace;
+	int		x, y;
+	float	mid, bottom;
+	
+	VectorAdd (ent->v.origin, ent->v.mins, mins);
+	VectorAdd (ent->v.origin, ent->v.maxs, maxs);
+
+// if all of the points under the corners are solid world, don't bother
+// with the tougher checks
+// the corners must be within 16 of the midpoint
+	start[2] = mins[2] - 1;
+	for	(x=0 ; x<=1 ; x++)
+		for	(y=0 ; y<=1 ; y++)
+		{
+			start[0] = x ? maxs[0] : mins[0];
+			start[1] = y ? maxs[1] : mins[1];
+			if (SV_PointContents (start) != CONTENTS_SOLID)
+				goto realcheck;
+		}
+
+	c_yes++;
+	return true;		// we got out easy
+
+realcheck:
+	c_no++;
+//
+// check it for real...
+//
+	start[2] = mins[2];
+	
+// the midpoint must be within 16 of the bottom
+	start[0] = stop[0] = (mins[0] + maxs[0])*0.5;
+	start[1] = stop[1] = (mins[1] + maxs[1])*0.5;
+	stop[2] = start[2] - 2*STEPSIZE;
+	trace = SV_Move (start, vec3_origin, vec3_origin, stop, true, ent);
+
+	if (trace.fraction == 1.0)
+		return false;
+	mid = bottom = trace.endpos[2];
+	
+// the corners must be within 16 of the midpoint	
+	for	(x=0 ; x<=1 ; x++)
+		for	(y=0 ; y<=1 ; y++)
+		{
+			start[0] = stop[0] = x ? maxs[0] : mins[0];
+			start[1] = stop[1] = y ? maxs[1] : mins[1];
+			
+			trace = SV_Move (start, vec3_origin, vec3_origin, stop, true, ent);
+			
+			if (trace.fraction != 1.0 && trace.endpos[2] > bottom)
+				bottom = trace.endpos[2];
+			if (trace.fraction == 1.0 || mid - trace.endpos[2] > STEPSIZE)
+				return false;
+		}
+
+	c_yes++;
+	return true;
+}
+
+
+/*
+=============
+SV_movestep
+
+Called by monster program code.
+The move will be adjusted for slopes and stairs, but if the move isn't
+possible, no move is done, false is returned, and
+pr_global_struct->trace_normal is set to the normal of the blocking wall
+=============
+*/
+qboolean SV_movestep (edict_t *ent, vec3_t move, qboolean relink)
+{
+	float		dz;
+	vec3_t		oldorg, neworg, end;
+	trace_t		trace;
+	int			i;
+	edict_t		*enemy;
+
+// try the move	
+	VectorCopy (ent->v.origin, oldorg);
+	VectorAdd (ent->v.origin, move, neworg);
+
+// flying monsters don't step up
+	if ( (int)ent->v.flags & (FL_SWIM | FL_FLY) )
+	{
+	// try one move with vertical motion, then one without
+		for (i=0 ; i<2 ; i++)
+		{
+			VectorAdd (ent->v.origin, move, neworg);
+			enemy = PROG_TO_EDICT(ent->v.enemy);
+			if (i == 0 && enemy != sv.edicts)
+			{
+				dz = ent->v.origin[2] - PROG_TO_EDICT(ent->v.enemy)->v.origin[2];
+				if (dz > 40)
+					neworg[2] -= 8;
+				if (dz < 30)
+					neworg[2] += 8;
+			}
+			trace = SV_Move (ent->v.origin, ent->v.mins, ent->v.maxs, neworg, false, ent);
+	
+			if (trace.fraction == 1)
+			{
+				if ( ((int)ent->v.flags & FL_SWIM) && SV_PointContents(trace.endpos) == CONTENTS_EMPTY )
+					return false;	// swim monster left water
+	
+				VectorCopy (trace.endpos, ent->v.origin);
+				if (relink)
+					SV_LinkEdict (ent, true);
+				return true;
+			}
+			
+			if (enemy == sv.edicts)
+				break;
+		}
+		
+		return false;
+	}
+
+// push down from a step height above the wished position
+	neworg[2] += STEPSIZE;
+	VectorCopy (neworg, end);
+	end[2] -= STEPSIZE*2;
+
+	trace = SV_Move (neworg, ent->v.mins, ent->v.maxs, end, false, ent);
+
+	if (trace.allsolid)
+		return false;
+
+	if (trace.startsolid)
+	{
+		neworg[2] -= STEPSIZE;
+		trace = SV_Move (neworg, ent->v.mins, ent->v.maxs, end, false, ent);
+		if (trace.allsolid || trace.startsolid)
+			return false;
+	}
+	if (trace.fraction == 1)
+	{
+	// if monster had the ground pulled out, go ahead and fall
+		if ( (int)ent->v.flags & FL_PARTIALGROUND )
+		{
+			VectorAdd (ent->v.origin, move, ent->v.origin);
+			if (relink)
+				SV_LinkEdict (ent, true);
+			ent->v.flags = (int)ent->v.flags & ~FL_ONGROUND;
+//	Con_Printf ("fall down\n"); 
+			return true;
+		}
+	
+		return false;		// walked off an edge
+	}
+
+// check point traces down for dangling corners
+	VectorCopy (trace.endpos, ent->v.origin);
+	
+	if (!SV_CheckBottom (ent))
+	{
+		if ( (int)ent->v.flags & FL_PARTIALGROUND )
+		{	// entity had floor mostly pulled out from underneath it
+			// and is trying to correct
+			if (relink)
+				SV_LinkEdict (ent, true);
+			return true;
+		}
+		VectorCopy (oldorg, ent->v.origin);
+		return false;
+	}
+
+	if ( (int)ent->v.flags & FL_PARTIALGROUND )
+	{
+//		Con_Printf ("back on ground\n"); 
+		ent->v.flags = (int)ent->v.flags & ~FL_PARTIALGROUND;
+	}
+	ent->v.groundentity = EDICT_TO_PROG(trace.ent);
+
+// the move is ok
+	if (relink)
+		SV_LinkEdict (ent, true);
+	return true;
+}
+
+
+//============================================================================
+
+/*
+======================
+SV_StepDirection
+
+Turns to the movement direction, and walks the current distance if
+facing it.
+
+======================
+*/
+void PF_changeyaw (void);
+qboolean SV_StepDirection (edict_t *ent, float yaw, float dist)
+{
+	vec3_t		move, oldorigin;
+	float		delta;
+	
+	ent->v.ideal_yaw = yaw;
+	PF_changeyaw();
+	
+	yaw = yaw*M_PI*2 / 360;
+	move[0] = cos(yaw)*dist;
+	move[1] = sin(yaw)*dist;
+	move[2] = 0;
+
+	VectorCopy (ent->v.origin, oldorigin);
+	if (SV_movestep (ent, move, false))
+	{
+		delta = ent->v.angles[YAW] - ent->v.ideal_yaw;
+		if (delta > 45 && delta < 315)
+		{		// not turned far enough, so don't take the step
+			VectorCopy (oldorigin, ent->v.origin);
+		}
+		SV_LinkEdict (ent, true);
+		return true;
+	}
+	SV_LinkEdict (ent, true);
+		
+	return false;
+}
+
+/*
+======================
+SV_FixCheckBottom
+
+======================
+*/
+void SV_FixCheckBottom (edict_t *ent)
+{
+//	Con_Printf ("SV_FixCheckBottom\n");
+	
+	ent->v.flags = (int)ent->v.flags | FL_PARTIALGROUND;
+}
+
+
+
+/*
+================
+SV_NewChaseDir
+
+================
+*/
+#define	DI_NODIR	-1
+void SV_NewChaseDir (edict_t *actor, edict_t *enemy, float dist)
+{
+	float		deltax,deltay;
+	float			d[3];
+	float		tdir, olddir, turnaround;
+
+	olddir = anglemod( (int)(actor->v.ideal_yaw/45)*45 );
+	turnaround = anglemod(olddir - 180);
+
+	deltax = enemy->v.origin[0] - actor->v.origin[0];
+	deltay = enemy->v.origin[1] - actor->v.origin[1];
+	if (deltax>10)
+		d[1]= 0;
+	else if (deltax<-10)
+		d[1]= 180;
+	else
+		d[1]= DI_NODIR;
+	if (deltay<-10)
+		d[2]= 270;
+	else if (deltay>10)
+		d[2]= 90;
+	else
+		d[2]= DI_NODIR;
+
+// try direct route
+	if (d[1] != DI_NODIR && d[2] != DI_NODIR)
+	{
+		if (d[1] == 0)
+			tdir = d[2] == 90 ? 45 : 315;
+		else
+			tdir = d[2] == 90 ? 135 : 215;
+			
+		if (tdir != turnaround && SV_StepDirection(actor, tdir, dist))
+			return;
+	}
+
+// try other directions
+	if ( ((rand()&3) & 1) ||  abs(deltay)>abs(deltax))
+	{
+		tdir=d[1];
+		d[1]=d[2];
+		d[2]=tdir;
+	}
+
+	if (d[1]!=DI_NODIR && d[1]!=turnaround 
+	&& SV_StepDirection(actor, d[1], dist))
+			return;
+
+	if (d[2]!=DI_NODIR && d[2]!=turnaround
+	&& SV_StepDirection(actor, d[2], dist))
+			return;
+
+/* there is no direct path to the player, so pick another direction */
+
+	if (olddir!=DI_NODIR && SV_StepDirection(actor, olddir, dist))
+			return;
+
+	if (rand()&1) 	/*randomly determine direction of search*/
+	{
+		for (tdir=0 ; tdir<=315 ; tdir += 45)
+			if (tdir!=turnaround && SV_StepDirection(actor, tdir, dist) )
+					return;
+	}
+	else
+	{
+		for (tdir=315 ; tdir >=0 ; tdir -= 45)
+			if (tdir!=turnaround && SV_StepDirection(actor, tdir, dist) )
+					return;
+	}
+
+	if (turnaround != DI_NODIR && SV_StepDirection(actor, turnaround, dist) )
+			return;
+
+	actor->v.ideal_yaw = olddir;		// can't move
+
+// if a bridge was pulled out from underneath a monster, it may not have
+// a valid standing position at all
+
+	if (!SV_CheckBottom (actor))
+		SV_FixCheckBottom (actor);
+
+}
+
+/*
+======================
+SV_CloseEnough
+
+======================
+*/
+qboolean SV_CloseEnough (edict_t *ent, edict_t *goal, float dist)
+{
+	int		i;
+	
+	for (i=0 ; i<3 ; i++)
+	{
+		if (goal->v.absmin[i] > ent->v.absmax[i] + dist)
+			return false;
+		if (goal->v.absmax[i] < ent->v.absmin[i] - dist)
+			return false;
+	}
+	return true;
+}
+
+/*
+======================
+SV_MoveToGoal
+
+======================
+*/
+void SV_MoveToGoal (void)
+{
+	edict_t		*ent, *goal;
+	float		dist;
+#ifdef QUAKE2
+	edict_t		*enemy;
+#endif
+
+	ent = PROG_TO_EDICT(pr_global_struct->self);
+	goal = PROG_TO_EDICT(ent->v.goalentity);
+	dist = G_FLOAT(OFS_PARM0);
+
+	if ( !( (int)ent->v.flags & (FL_ONGROUND|FL_FLY|FL_SWIM) ) )
+	{
+		G_FLOAT(OFS_RETURN) = 0;
+		return;
+	}
+
+// if the next step hits the enemy, return immediately
+#ifdef QUAKE2
+	enemy = PROG_TO_EDICT(ent->v.enemy);
+	if (enemy != sv.edicts &&  SV_CloseEnough (ent, enemy, dist) )
+#else
+	if ( PROG_TO_EDICT(ent->v.enemy) != sv.edicts &&  SV_CloseEnough (ent, goal, dist) )
+#endif
+		return;
+
+// bump around...
+	if ( (rand()&3)==1 ||
+	!SV_StepDirection (ent, ent->v.ideal_yaw, dist))
+	{
+		SV_NewChaseDir (ent, goal, dist);
+	}
+}
+