stuff that was missing

src/hardware/hw_main.c

@@ -2820,6 +2820,13 @@ static boolean HWR_DoCulling(line_t *cullheight, line_t *viewcullheight, float v
 	return false;
 }
 
+static FBITFIELD HWR_RippleBlend(sector_t *sector, ffloor_t *rover, boolean ceiling)
+{
+	(void)sector;
+	(void)ceiling;
+	return /*R_IsRipplePlane(sector, rover, ceiling)*/ (rover->flags & FF_RIPPLE) ? PF_Ripple : 0;
+}
+
 // -----------------+
 // HWR_Subsector    : Determine floor/ceiling planes.
 //                  : Add sprites of things in sector.
@@ -4957,6 +4964,7 @@ static void HWR_ProjectPrecipitationSprite(precipmobj_t *thing)
 		if (!R_BlendLevelVisible(thing->blendmode, (thing->frame & FF_TRANSMASK)>>FF_TRANSSHIFT))
 			return;
 	}
+
 	// transform the origin point
 	tr_x = FIXED_TO_FLOAT(interp.x);
 	tr_y = FIXED_TO_FLOAT(interp.y);

src/r_things.c

@@ -2108,7 +2108,7 @@ void R_AddPrecipitationSprites(void)
 		{
 			for (th = precipblocklinks[(by * bmapwidth) + bx]; th; th = next)
 			{
-				// Store this beforehand because R_ProjectPrecipitionSprite may free th (see P_PrecipThinker)
+				// Store this beforehand because R_ProjectPrecipitationSprite may free th (see P_PrecipThinker)
 				next = th->bnext;
 
 				if (th->precipflags & PCF_INVISIBLE)