From: Sebastian <git@sraa.de>
Date: Tue, 12 Aug 2014 20:53:21 +0000 (+0000)
Subject: simple full bounce-back borders
X-Git-Url: http://sraa.de/git/%3CTMPL_VAR%20NAME=ALBUMCOVER%3E?a=commitdiff_plain;h=d9385e15b88eb76a1a2b36973aa872d5d867534c;p=lattice-boltzmann-epiphany.git

simple full bounce-back borders
---

diff --git a/lb/esrc/d2q9.c b/lb/esrc/d2q9.c
index c4ada9d..7a9d0b5 100644
--- a/lb/esrc/d2q9.c
+++ b/lb/esrc/d2q9.c
@@ -76,11 +76,19 @@ void d2q9_stream(d2q9_block_t f, int x, int y)
 		if(next_y < 0)             { next_row--; next_y += BLOCK_Y; }
 		else if(next_y >= BLOCK_Y) { next_row++; next_y -= BLOCK_Y; }
 
+#if 0
 		/* outer borders (wrap around) */
 		if(next_col < 0)             { next_col += CORES_X; }
 		else if(next_col >= CORES_X) { next_col -= CORES_X; }
 		if(next_row < 0)             { next_row += CORES_Y; }
 		else if(next_row >= CORES_Y) { next_row -= CORES_Y; }
+#else
+		/* full bounce-back on all sides */
+		if(next_col < 0)             { return; }
+		else if(next_col >= CORES_X) { return; }
+		if(next_row < 0)             { return; }
+		else if(next_row >= CORES_Y) { return; }
+#endif
 
 		/* f: local block, g: local or remote block */
 		d2q9_block_t *g = (void*)f;