From 71131ac86a3caf99d7d3285e7af894b8721e8c4d Mon Sep 17 00:00:00 2001
From: Matthew Berry <me@mattrb.com>
Date: Tue, 25 May 2021 00:23:34 -0700
Subject: [PATCH] increment affine reference points before hdma

This alone seems to fix Golden Sun. Many games like Gadget Racers still
don't work, but this seems to be a closer approximation of "correct".
Finally, the best game for the GBA is playable... I'm sad that this was
all it took to "fix" lol.
---
 src/crab/gba/ppu.cr | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/crab/gba/ppu.cr b/src/crab/gba/ppu.cr
index 366aed9..4d3531a 100644
--- a/src/crab/gba/ppu.cr
+++ b/src/crab/gba/ppu.cr
@@ -47,11 +47,11 @@ module GBA
       end
       if @vcount < 160
         scanline
-        @gba.dma.trigger_hdma
         @bgref_int.each_with_index do |bgrefs, bg_num|
           bgrefs[0] &+= @bgaff[bg_num][1].num # bgx += dmx
           bgrefs[1] &+= @bgaff[bg_num][3].num # bgy += dmy
         end
+        @gba.dma.trigger_hdma
       end
     end