From 28aaf40e6db9909f76cada6edc43295cdd024b8f Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Sigrid=20Solveig=20Hafl=C3=ADnud=C3=B3ttir?=
 <ftrvxmtrx@gmail.com>
Date: Tue, 2 Nov 2021 18:18:30 +0100
Subject: [PATCH] ppu_write: put new byte value only if it's different

---
 src/devices/ppu.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/src/devices/ppu.c b/src/devices/ppu.c
index 20c4abe..9d04511 100644
--- a/src/devices/ppu.c
+++ b/src/devices/ppu.c
@@ -61,9 +61,10 @@ ppu_write(Ppu *p, Uint8 layer, Uint16 x, Uint16 y, Uint8 color)
 		Uint8 pix = p->pixels[row];
 		Uint8 mask = ~(0x3 << shift);
 		Uint8 pixnew = (pix & mask) + (color << shift);
-		p->pixels[row] = pixnew;
-		if(pix != pixnew)
+		if(pix != pixnew){
+			p->pixels[row] = pixnew;
 			p->reqdraw = 1;
+		}
 	}
 }