From 9d4586b532f259a0764f84c570509651670c8f9d Mon Sep 17 00:00:00 2001
From: TimeServ <timeserv@users.sourceforge.net>
Date: Sat, 18 Jun 2011 12:25:36 +0000
Subject: [PATCH] delink particle states on r_particlesystem change, correctly
 use default trails on models

git-svn-id: https://svn.code.sf.net/p/fteqw/code/branches/wip@3822 fc73d0e0-1445-4013-8a0c-d673dee63da5
---
 engine/client/cl_ents.c | 16 ++++++++++++----
 engine/client/cl_tent.c | 11 +++++++++++
 engine/client/client.h  |  2 ++
 engine/client/pr_csqc.c |  7 ++++---
 engine/client/r_part.c  |  6 ++++++
 5 files changed, 35 insertions(+), 7 deletions(-)

diff --git a/engine/client/cl_ents.c b/engine/client/cl_ents.c
index 04bd3c5d2..e29ffafd5 100644
--- a/engine/client/cl_ents.c
+++ b/engine/client/cl_ents.c
@@ -1590,6 +1590,16 @@ static void CL_UpdateNetFrameLerpState(qboolean force, unsigned int curframe, le
 	}
 }
 
+void CL_ClearLerpEntsParticleState(void)
+{
+	int i;
+	for (i = 0; i < cl.maxlerpents; i++)
+	{
+		pe->DelinkTrailstate(&(cl.lerpents[i].trailstate));
+		pe->DelinkTrailstate(&(cl.lerpents[i].emitstate));
+	}
+}
+
 void CL_LinkStaticEntities(void *pvs)
 {
 	int i;
@@ -2198,11 +2208,9 @@ void CL_LinkPacketEntities (void)
 			}
 		}
 
-		if (model->particletrail >= 0)
-		{
-			if (pe->ParticleTrail (old_origin, ent->origin, model->particletrail, &(le->trailstate)))
+		if (model->particletrail == P_INVALID || pe->ParticleTrail (old_origin, ent->origin, model->particletrail, &(le->trailstate)))
+			if (model->traildefaultindex >= 0)
 				pe->ParticleTrailIndex(old_origin, ent->origin, model->traildefaultindex, 0, &(le->trailstate));
-		}
 
 		{
 			extern cvar_t gl_part_flame;
diff --git a/engine/client/cl_tent.c b/engine/client/cl_tent.c
index a97aa87d4..efed486e3 100644
--- a/engine/client/cl_tent.c
+++ b/engine/client/cl_tent.c
@@ -346,6 +346,17 @@ void CL_ShutdownTEnts (void)
 		BZ_Free(ae);
 	}
 }
+
+void CL_ClearTEntParticleState (void)
+{
+	int i;
+	for (i = 0; i < beams_running; i++)
+	{
+		pe->DelinkTrailstate(&(cl_beams[i].trailstate));
+		pe->DelinkTrailstate(&(cl_beams[i].emitstate));
+	}
+}
+
 void P_LoadedModel(model_t *mod)
 {
 	struct associatedeffect *ae;
diff --git a/engine/client/client.h b/engine/client/client.h
index 926a318be..69c73f9fb 100644
--- a/engine/client/client.h
+++ b/engine/client/client.h
@@ -973,6 +973,7 @@ void DropPunchAngle (int pnum);
 void CL_RegisterParticles(void);
 void CL_InitTEnts (void);
 void CL_ClearTEnts (void);
+void CL_ClearTEntParticleState (void);
 void CL_ClearCustomTEnts(void);
 void CL_ParseCustomTEnt(void);
 void CL_ParseEffect (qboolean effect2);
@@ -1005,6 +1006,7 @@ void CL_LinkViewModel(void);
 void CL_LinkPlayers (void);
 void CL_LinkPacketEntities (void);
 void CL_LinkProjectiles (void);
+void CL_ClearLerpEntsParticleState (void);
 qboolean CL_MayLerp(void);
 
 //
diff --git a/engine/client/pr_csqc.c b/engine/client/pr_csqc.c
index badfaa45d..d0c4a9f1b 100644
--- a/engine/client/pr_csqc.c
+++ b/engine/client/pr_csqc.c
@@ -4048,10 +4048,11 @@ void CSQC_EntStateToCSQC(unsigned int flags, float lerptime, entity_state_t *src
 	if (!(flags & RSES_NOTRAILS))
 	{
 		//use entnum as a test to see if its new (if the old origin isn't usable)
-		if (ent->xv->entnum && model->particletrail >= 0)
+		if (ent->xv->entnum)
 		{
-			if (pe->ParticleTrail (ent->v->origin, src->origin, model->particletrail, &(le->trailstate)))
-				pe->ParticleTrailIndex(ent->v->origin, src->origin, model->traildefaultindex, 0, &(le->trailstate));
+			if (model->particletrail == P_INVALID || pe->ParticleTrail (ent->v->origin, src->origin, model->particletrail, &(le->trailstate)))
+				if (model->traildefaultindex >= 0)
+					pe->ParticleTrailIndex(ent->v->origin, src->origin, model->traildefaultindex, 0, &(le->trailstate));
 		}
 	}
 
diff --git a/engine/client/r_part.c b/engine/client/r_part.c
index 92c9acc8c..b2842262b 100644
--- a/engine/client/r_part.c
+++ b/engine/client/r_part.c
@@ -82,6 +82,9 @@ void R_ParticleSystem_Callback(struct cvar_s *var, char *oldvalue)
 	int i;
 	if (pe)
 	{
+		CL_ClearTEntParticleState();
+		CL_ClearLerpEntsParticleState();
+
 		pe->ShutdownParticles();
 	}
 
@@ -444,5 +447,8 @@ void P_DefaultTrail (model_t *model)
 		model->traildefaultindex = 254;
 	}
 	else
+	{
 		model->particletrail = P_INVALID;
+		model->traildefaultindex = -1;
+	}
 }