Add function to wait for VGA's vsync

1 files changed, 6 insertions, 0 deletions

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);