From 839429029d520cac17f192c5cf17b6f5ba46a42c Mon Sep 17 00:00:00 2001
From: Alex Janka <alex@alexjanka.com>
Date: Sun, 5 Feb 2023 18:50:07 +1100
Subject: [PATCH] reset vblank flag lol

---
 src/processor/gpu.rs | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/src/processor/gpu.rs b/src/processor/gpu.rs
index 9438b7b..13ee71f 100644
--- a/src/processor/gpu.rs
+++ b/src/processor/gpu.rs
@@ -1,6 +1,6 @@
 use crate::{HEIGHT, WIDTH};
 
-use super::{set_bit, set_or_clear_bit, CPU};
+use super::{clear_bit, set_bit, set_or_clear_bit, CPU};
 
 #[derive(PartialEq)]
 enum DrawMode {
@@ -51,8 +51,7 @@ impl CPU {
                     self.gpu.mode_clock = 0;
                     self.gpu.scanline += 1;
                     if self.gpu.scanline == 153 {
-                        self.gpu.mode = DrawMode::Mode2;
-                        self.gpu.scanline = 0;
+                        self.exit_vblank();
                     }
                 }
             }
@@ -86,6 +85,13 @@ impl CPU {
         self.memory.set(0xFF0F, set_bit(self.memory.get(0xFF0F), 0));
     }
 
+    fn exit_vblank(&mut self) {
+        self.gpu.mode = DrawMode::Mode2;
+        self.gpu.scanline = 0;
+        self.memory
+            .set(0xFF0F, clear_bit(self.memory.get(0xFF0F), 0));
+    }
+
     fn set_lcd_status(&mut self) {
         let mut stat = self.memory.get(0xFF41);
         stat = set_or_clear_bit(stat, 2, self.memory.get(0xFF44) == self.memory.get(0xFF45));