fix: vsync issue with SDL

CHANGELOG.md

@@ -20,6 +20,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Fixed
 
 * Bug with ROM title that included 0x0 characters in it
+* V-Sync issue with SDL
 
 ## [0.6.7] - 2023-02-13
 

frontends/sdl/src/main.rs

@@ -14,7 +14,7 @@ use util::Graphics;
 
 use crate::util::surface_from_bytes;
 
-/// The ration at which the logic of the Game Boy is
+/// The ratio at which the logic of the Game Boy is
 /// going to be run, increasing this value will provide
 /// better emulator accuracy, please keep in mind that
 /// the PPU will keep running at the same speed.
@@ -224,6 +224,9 @@ impl Emulator {
             let mut last_frame = 0xffffu16;
 
             if current_time >= self.next_tick_time_i {
+                // calculates the number of cycles that are meant to be the target
+                // for the current "tick" operation this is basically the number of
+                // cycles per LCD roundtrip divided by the logic ratio
                 let cycle_limit = (GameBoy::LCD_CYCLES as f32 / self.logic_ratio) as u32;
 
                 loop {

frontends/sdl/src/util.rs

@@ -44,7 +44,12 @@ impl Graphics {
 
         // creates an accelerated canvas to be used in the drawing
         // then clears it so that is can be presented empty initially
-        let mut canvas = window.into_canvas().accelerated().build().unwrap();
+        let mut canvas = window
+            .into_canvas()
+            .accelerated()
+            .present_vsync()
+            .build()
+            .unwrap();
         canvas.set_logical_size(width, height).unwrap();
         canvas.clear();