import the Slacker's QVM code base

1 files changed, 167 insertions, 0 deletions

diff --git a/src/game/g_physics.c b/src/game/g_physics.c
new file mode 100644
index 0000000..58c6487
--- /dev/null
+++ b/src/game/g_physics.c
@@ -0,0 +1,167 @@
+/*
+===========================================================================
+Copyright (C) 1999-2005 Id Software, Inc.
+Copyright (C) 2000-2006 Tim Angus
+
+This file is part of Tremulous.
+
+Tremulous 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.
+
+Tremulous 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 Tremulous; if not, write to the Free Software
+Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+===========================================================================
+*/
+
+#include "g_local.h"
+
+/*
+================
+G_Bounce
+
+================
+*/
+static void G_Bounce( gentity_t *ent, trace_t *trace )
+{
+  vec3_t    velocity;
+  float     dot;
+  int       hitTime;
+  float     minNormal;
+  qboolean  invert = qfalse;
+
+  // reflect the velocity on the trace plane
+  hitTime = level.previousTime + ( level.time - level.previousTime ) * trace->fraction;
+  BG_EvaluateTrajectoryDelta( &ent->s.pos, hitTime, velocity );
+  dot = DotProduct( velocity, trace->plane.normal );
+  VectorMA( velocity, -2*dot, trace->plane.normal, ent->s.pos.trDelta );
+
+  if( ent->s.eType == ET_BUILDABLE )
+  {
+    minNormal = BG_FindMinNormalForBuildable( ent->s.modelindex );
+    invert = BG_FindInvertNormalForBuildable( ent->s.modelindex );
+  }
+  else
+    minNormal = 0.707f;
+
+  // cut the velocity to keep from bouncing forever
+  if( ( trace->plane.normal[ 2 ] >= minNormal ||
+      ( invert && trace->plane.normal[ 2 ] <= -minNormal ) ) &&
+      trace->entityNum == ENTITYNUM_WORLD )
+    VectorScale( ent->s.pos.trDelta, ent->physicsBounce, ent->s.pos.trDelta );
+  else
+    VectorScale( ent->s.pos.trDelta, 0.3f, ent->s.pos.trDelta );
+
+  if( VectorLength( ent->s.pos.trDelta ) < 10 )
+  {
+    VectorMA( trace->endpos, 0.5f, trace->plane.normal, trace->endpos ); // make sure it is off ground
+    G_SetOrigin( ent, trace->endpos );
+    ent->s.groundEntityNum = trace->entityNum;
+    VectorCopy( trace->plane.normal, ent->s.origin2 );
+    VectorSet( ent->s.pos.trDelta, 0.0f, 0.0f, 0.0f );
+    return;
+  }
+
+  VectorCopy( ent->r.currentOrigin, ent->s.pos.trBase );
+  VectorAdd( ent->r.currentOrigin, trace->plane.normal, ent->r.currentOrigin);
+  ent->s.pos.trTime = level.time;
+}
+
+#define PHYSICS_TIME 200
+
+/*
+================
+G_Physics
+
+================
+*/
+void G_Physics( gentity_t *ent, int msec )
+{
+  vec3_t    origin;
+  trace_t   tr;
+  int     contents;
+  int     mask;
+
+  // if groundentity has been set to -1, it may have been pushed off an edge
+  if( ent->s.groundEntityNum == -1 )
+  {
+    if( ent->s.eType == ET_BUILDABLE )
+    {
+      if( ent->s.pos.trType != BG_FindTrajectoryForBuildable( ent->s.modelindex ) )
+      {
+        ent->s.pos.trType = BG_FindTrajectoryForBuildable( ent->s.modelindex );
+        ent->s.pos.trTime = level.time;
+      }
+    }
+    else if( ent->s.pos.trType != TR_GRAVITY )
+    {
+      ent->s.pos.trType = TR_GRAVITY;
+      ent->s.pos.trTime = level.time;
+    }
+  }
+
+  // trace a line from the previous position to the current position
+  if( ent->clipmask )
+    mask = ent->clipmask;
+  else
+    mask = MASK_PLAYERSOLID & ~CONTENTS_BODY;//MASK_SOLID;
+
+  if( ent->s.pos.trType == TR_STATIONARY )
+  {
+    // check think function
+    G_RunThink( ent );
+
+    //check floor infrequently
+    if( ent->nextPhysicsTime < level.time )
+    {
+      VectorCopy( ent->r.currentOrigin, origin );
+
+      VectorMA( origin, -2.0f, ent->s.origin2, origin );
+
+      trap_Trace( &tr, ent->r.currentOrigin, ent->r.mins, ent->r.maxs, origin, ent->s.number, mask );
+
+      if( tr.fraction == 1.0f )
+        ent->s.groundEntityNum = -1;
+
+      ent->nextPhysicsTime = level.time + PHYSICS_TIME;
+    }
+
+    return;
+  }
+
+  // get current position
+  BG_EvaluateTrajectory( &ent->s.pos, level.time, origin );
+
+  trap_Trace( &tr, ent->r.currentOrigin, ent->r.mins, ent->r.maxs, origin, ent->s.number, mask );
+
+  VectorCopy( tr.endpos, ent->r.currentOrigin );
+
+  if( tr.startsolid )
+    tr.fraction = 0;
+
+  trap_LinkEntity( ent ); // FIXME: avoid this for stationary?
+
+  // check think function
+  G_RunThink( ent );
+
+  if( tr.fraction == 1.0f )
+    return;
+
+  // if it is in a nodrop volume, remove it
+  contents = trap_PointContents( ent->r.currentOrigin, -1 );
+  if( contents & CONTENTS_NODROP )
+  {
+    G_FreeEntity( ent );
+    return;
+  }
+
+  G_Bounce( ent, &tr );
+}
+