From 3a7298d6aeca9957c9dcf7ff80df33f32785c7ec Mon Sep 17 00:00:00 2001
From: Zack Middleton <zturtleman@gmail.com>
Date: Tue, 6 May 2014 20:39:17 -0500
Subject: [PATCH] Make R_LerpTag return qfalse if MDR tag does not exist

Elite Force SDK has trap_R_LerpTag return void, so this shouldn't cause issues for iostvef.
Allows new games to check if a tag exists in a MDR model.
---
 code/renderergl1/tr_model.c | 33 +++++++++++++--------------------
 code/renderergl2/tr_model.c | 32 +++++++++++++-------------------
 2 files changed, 26 insertions(+), 39 deletions(-)

diff --git a/code/renderergl1/tr_model.c b/code/renderergl1/tr_model.c
index a3f91aee..51269a51 100644
--- a/code/renderergl1/tr_model.c
+++ b/code/renderergl1/tr_model.c
@@ -966,7 +966,7 @@ static md3Tag_t *R_GetTag( md3Header_t *mod, int frame, const char *tagName ) {
 	return NULL;
 }
 
-void R_GetAnimTag( mdrHeader_t *mod, int framenum, const char *tagName, md3Tag_t * dest) 
+md3Tag_t *R_GetAnimTag( mdrHeader_t *mod, int framenum, const char *tagName, md3Tag_t * dest) 
 {
 	int				i, j, k;
 	int				frameSize;
@@ -1001,13 +1001,11 @@ void R_GetAnimTag( mdrHeader_t *mod, int framenum, const char *tagName, md3Tag_t
 			dest->origin[1]=frame->bones[tag->boneIndex].matrix[1][3];
 			dest->origin[2]=frame->bones[tag->boneIndex].matrix[2][3];				
 
-			return;
+			return dest;
 		}
 	}
 
-	AxisClear( dest->axis );
-	VectorClear( dest->origin );
-	strcpy(dest->name,"");
+	return NULL;
 }
 
 /*
@@ -1028,34 +1026,29 @@ int R_LerpTag( orientation_t *tag, qhandle_t handle, int startFrame, int endFram
 	{
 		if(model->type == MOD_MDR)
 		{
-			start = &start_space;
-			end = &end_space;
-			R_GetAnimTag((mdrHeader_t *) model->modelData, startFrame, tagName, start);
-			R_GetAnimTag((mdrHeader_t *) model->modelData, endFrame, tagName, end);
+			start = R_GetAnimTag((mdrHeader_t *) model->modelData, startFrame, tagName, &start_space);
+			end = R_GetAnimTag((mdrHeader_t *) model->modelData, endFrame, tagName, &end_space);
 		}
 		else if( model->type == MOD_IQM ) {
 			return R_IQMLerpTag( tag, model->modelData,
 					startFrame, endFrame,
 					frac, tagName );
 		} else {
-
-			AxisClear( tag->axis );
-			VectorClear( tag->origin );
-			return qfalse;
-
+			start = end = NULL;
 		}
 	}
 	else
 	{
 		start = R_GetTag( model->md3[0], startFrame, tagName );
 		end = R_GetTag( model->md3[0], endFrame, tagName );
-		if ( !start || !end ) {
-			AxisClear( tag->axis );
-			VectorClear( tag->origin );
-			return qfalse;
-		}
 	}
-	
+
+	if ( !start || !end ) {
+		AxisClear( tag->axis );
+		VectorClear( tag->origin );
+		return qfalse;
+	}
+
 	frontLerp = frac;
 	backLerp = 1.0f - frac;
 
diff --git a/code/renderergl2/tr_model.c b/code/renderergl2/tr_model.c
index c0dbeaa2..f2f55425 100644
--- a/code/renderergl2/tr_model.c
+++ b/code/renderergl2/tr_model.c
@@ -1230,7 +1230,7 @@ static mdvTag_t *R_GetTag( mdvModel_t *mod, int frame, const char *_tagName ) {
 	return NULL;
 }
 
-void R_GetAnimTag( mdrHeader_t *mod, int framenum, const char *tagName, mdvTag_t * dest)
+mdvTag_t *R_GetAnimTag( mdrHeader_t *mod, int framenum, const char *tagName, mdvTag_t * dest)
 {
 	int				i, j, k;
 	int				frameSize;
@@ -1263,12 +1263,11 @@ void R_GetAnimTag( mdrHeader_t *mod, int framenum, const char *tagName, mdvTag_t
 			dest->origin[1]=frame->bones[tag->boneIndex].matrix[1][3];
 			dest->origin[2]=frame->bones[tag->boneIndex].matrix[2][3];				
 
-			return;
+			return dest;
 		}
 	}
 
-	AxisClear( dest->axis );
-	VectorClear( dest->origin );
+	return NULL;
 }
 
 /*
@@ -1289,34 +1288,29 @@ int R_LerpTag( orientation_t *tag, qhandle_t handle, int startFrame, int endFram
 	{
 		if(model->type == MOD_MDR)
 		{
-			start = &start_space;
-			end = &end_space;
-			R_GetAnimTag((mdrHeader_t *) model->modelData, startFrame, tagName, start);
-			R_GetAnimTag((mdrHeader_t *) model->modelData, endFrame, tagName, end);
+			start = R_GetAnimTag((mdrHeader_t *) model->modelData, startFrame, tagName, &start_space);
+			end = R_GetAnimTag((mdrHeader_t *) model->modelData, endFrame, tagName, &end_space);
 		}
 		else if( model->type == MOD_IQM ) {
 			return R_IQMLerpTag( tag, model->modelData,
 					startFrame, endFrame,
 					frac, tagName );
 		} else {
-
-			AxisClear( tag->axis );
-			VectorClear( tag->origin );
-			return qfalse;
-
+			start = end = NULL;
 		}
 	}
 	else
 	{
 		start = R_GetTag( model->mdv[0], startFrame, tagName );
 		end = R_GetTag( model->mdv[0], endFrame, tagName );
-		if ( !start || !end ) {
-			AxisClear( tag->axis );
-			VectorClear( tag->origin );
-			return qfalse;
-		}
 	}
-	
+
+	if ( !start || !end ) {
+		AxisClear( tag->axis );
+		VectorClear( tag->origin );
+		return qfalse;
+	}
+
 	frontLerp = frac;
 	backLerp = 1.0f - frac;