ref: gl: only draw MOVETYPE_FOLLOW studio model if it's parent is visible

ref/gl/gl_local.h

@@ -399,6 +399,7 @@ void R_TranslateForEntity( cl_entity_t *e );
 void R_RotateForEntity( cl_entity_t *e );
 void R_SetupGL( qboolean set_gl_state );
 void R_AllowFog( qboolean allowed );
+qboolean R_OpaqueEntity( cl_entity_t *ent );
 void R_SetupFrustum( void );
 void R_FindViewLeaf( void );
 void R_CheckGamma( void );

ref/gl/gl_rmain.c

@@ -61,7 +61,7 @@ R_OpaqueEntity
 Opaque entity can be brush or studio model but sprite
 ===============
 */
-static qboolean R_OpaqueEntity( cl_entity_t *ent )
+qboolean R_OpaqueEntity( cl_entity_t *ent )
 {
 	if( R_GetEntityRenderMode( ent ) == kRenderNormal )
 		return true;

ref/gl/gl_studio.c

@@ -3527,7 +3527,7 @@ static int R_StudioDrawModel( int flags )
 R_StudioDrawModelInternal
 =================
 */
-void R_StudioDrawModelInternal( cl_entity_t *e, int flags )
+static void R_StudioDrawModelInternal( cl_entity_t *e, int flags )
 {
 	if( !RI.drawWorld )
 	{
@@ -3560,22 +3560,42 @@ void R_DrawStudioModel( cl_entity_t *e )
 	{
 		R_StudioDrawModelInternal( e, STUDIO_RENDER|STUDIO_EVENTS );
 	}
-	else
+	else if( e->curstate.movetype == MOVETYPE_FOLLOW && e->curstate.aiment > 0 )
+	{
+		cl_entity_t *parent = CL_GetEntityByIndex( e->curstate.aiment ), **entities;
+		uint i, num_entities;
+
+		if( !parent || !parent->model || parent->model->type != mod_studio )
+			return;
+
+		if( R_OpaqueEntity( parent ))
 		{
-		if( e->curstate.movetype == MOVETYPE_FOLLOW && e->curstate.aiment > 0 )
+			entities = tr.draw_list->solid_entities;
+			num_entities = tr.draw_list->num_solid_entities;
+		}
+		else
 		{
-			cl_entity_t *parent = CL_GetEntityByIndex( e->curstate.aiment );
+			entities = tr.draw_list->trans_entities;
+			num_entities = tr.draw_list->num_solid_entities;
+		}
 
-			if( parent && parent->model && parent->model->type == mod_studio )
+		for( i = 0; i < num_entities; i++ )
 		{
-				RI.currententity = parent;
+			if( (*entities)[i].index != e->curstate.aiment )
+				continue;
+
+			RI.currententity = &(*entities)[i];
 			R_StudioDrawModelInternal( RI.currententity, 0 );
-				VectorCopy( parent->curstate.origin, e->curstate.origin );
+			VectorCopy( RI.currententity->curstate.origin, e->curstate.origin );
-				VectorCopy( parent->origin, e->origin );
+			VectorCopy( RI.currententity->origin, e->origin );
 			RI.currententity = e;
+
+			R_StudioDrawModelInternal( e, STUDIO_RENDER|STUDIO_EVENTS );
+			break;
 		}
 	}
-
+	else
+	{
 		R_StudioDrawModelInternal( e, STUDIO_RENDER|STUDIO_EVENTS );
 	}
 }