Deactivate VSync with err handling, fix framerate

src/Renderer.zig

@@ -31,6 +31,9 @@ pub fn init() !Self {
     );
 
     const ctx = try sdl.gl.createContext(window);
+    sdl.gl.setSwapInterval( .immediate ) catch {
+        std.debug.print("WARNING: Unable to configure the swap interval.\n", .{});
+    };
 
     var mvp_loc: u32 = undefined;
     var color_loc: u32 = undefined;

src/main.zig

@@ -38,8 +38,8 @@ pub fn main() !void {
 
         const delay = SDL.getTicks64() - start;
         std.debug.print("{} ms\n", .{delay});
-        if (delay < 15) {
-            SDL.delay(15 - @intCast(u32, delay));
+        if (delay < 16) {
+            SDL.delay(16 - @intCast(u32, delay));
         }
     }
 }