From e5ba9cb62c62a4a9cb9012dfd45870bc5b988def Mon Sep 17 00:00:00 2001
From: "Juan J. Martinez" <jjm@usebox.net>
Date: Thu, 1 Jun 2023 22:36:51 +0100
Subject: Add function to wait for VGA's vsync

---
 src/vga.c | 6 ++++++
 1 file changed, 6 insertions(+)

(limited to 'src/vga.c')

diff --git a/src/vga.c b/src/vga.c
index a6524bd..981ad6f 100644
--- a/src/vga.c
+++ b/src/vga.c
@@ -24,6 +24,12 @@ void set_mode(uint8_t mode)
     __dpmi_int(0x10, &regs);
 }
 
+void wait_vsync()
+{
+    while (inportb(0x3da) & 8);
+    while (!(inportb(0x3da) & 8));
+}
+
 void set_palette(const uint8_t *palette)
 {
     outportb(0x3c8, 0);
-- 
cgit v1.2.3