From d45c00d0d2cbfef6fd484ca7af764c95a69fefe3 Mon Sep 17 00:00:00 2001
From: Herbert Wolverson <herberticus@gmail.com>
Date: Sat, 4 Jan 2020 11:01:21 -0600
Subject: [PATCH] Fixes #38 - flip the y on amethyst tile render

---
 src/hal/amethyst_be/mainloop.rs | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/hal/amethyst_be/mainloop.rs b/src/hal/amethyst_be/mainloop.rs
index dec22952..8a71acc0 100644
--- a/src/hal/amethyst_be/mainloop.rs
+++ b/src/hal/amethyst_be/mainloop.rs
@@ -98,7 +98,8 @@ impl SimpleState for RltkGemBridge {
                     .iter()
                     .for_each(|coord| {
                         if let Some(fg) = map.get_mut(&coord) {
-                            let idx = ((coord.y * size.0) + coord.x) as usize;
+                            let flipped_y = (size.1-1) - coord.y;
+                            let idx = ((flipped_y * size.0) + coord.x) as usize;
                             if idx < concrete.tiles.len() {
                                 let tile = &concrete.tiles[idx];
                                 fg.glyph = tile.glyph as usize;