framerate cap

2 files changed, 13 insertions, 2 deletions

diff --git a/settings.txt b/settings.txt
index fa8db82..13482df 100644
--- a/settings.txt
+++ b/settings.txt
@@ -21,3 +21,7 @@ focal-length 1
 fov 45
 #    set this to 1 to use HSV instead of RGB for color
 hsv 0
+#    framerate cap.
+#    by default, vsync is enabled, so you don't need to change this unless you want
+#    to run at an even lower framerate than your monitor's refresh rate
+max-framerate 1000
diff --git a/src/main.rs b/src/main.rs
index 38898a2..f77a3b7 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,7 +1,5 @@
 /*
 @TODO:
-- options for:
-	- max framerate
 - come up with twisty lipschitz continuous function, & add it
 - (slightly) more interesting constants
 - Params instead of depth for GenRandom
@@ -418,6 +416,15 @@ impl State {
 	
 	// returns false if we should quit
 	fn frame(&mut self) -> bool {
+		if let Some(max_framerate) = self.settings.get_f32("max-framerate") {
+			if max_framerate > 0.0 {
+				let dt = self.frame_time.elapsed().as_secs_f32();
+				let sleep_millis = 1000.0 * (1.0 / max_framerate - dt);
+				if sleep_millis >= 1.0 {
+					std::thread::sleep(std::time::Duration::from_millis(sleep_millis as u64));
+				}
+			}
+		}
 		let frame_dt = self.frame_time.elapsed().as_secs_f32();
 		self.frame_time = Instant::now();