perf: backport CalcBones optimizations from CS:GO

* lower LODs are now marked as set up
* align parent transform matrix

Author: mastercoms

src/game/client/c_baseanimating.cpp

@@ -2850,6 +2850,20 @@ bool C_BaseAnimating::SetupBones( matrix3x4_t *pBoneToWorldOut, int nMaxBones, i
 		}
 	}
 
+	// If we're setting up LOD N, we have set up all lower LODs also
+	// because lower LODs always use subsets of the bones of higher LODs.
+	int nLOD = 0;
+	int nMask = BONE_USED_BY_VERTEX_LOD0;
+	for( ; nLOD < MAX_NUM_LODS; ++nLOD, nMask <<= 1 )
+	{
+		if ( boneMask & nMask )
+			break;
+	}
+	for( ; nLOD < MAX_NUM_LODS; ++nLOD, nMask <<= 1 )
+	{
+		boneMask |= nMask;
+	}
+
 #ifdef DEBUG_BONE_SETUP_THREADING
 	if ( cl_warn_thread_contested_bone_setup.GetBool() )
 	{
@@ -2917,7 +2931,7 @@ bool C_BaseAnimating::SetupBones( matrix3x4_t *pBoneToWorldOut, int nMaxBones, i
 			return false;
 
 		// Setup our transform based on render angles and origin.
-		matrix3x4_t parentTransform;
+		ALIGN16 matrix3x4_t parentTransform ALIGN16_POST;
 		AngleMatrix( GetRenderAngles(), GetRenderOrigin(), parentTransform );
 
 		// Load the boneMask with the total of what was asked for last frame.