From b9570962cfc214bbac0f3fef1e6c1f9848f52658 Mon Sep 17 00:00:00 2001
From: Mica White <botahamec@outlook.com>
Date: Wed, 17 Jun 2026 17:41:28 -0400
Subject: Basic renderer and framerate test

---
 src/main.rs | 47 ++++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 46 insertions(+), 1 deletion(-)

(limited to 'src/main.rs')

diff --git a/src/main.rs b/src/main.rs
index e7a11a9..e8c9f23 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,3 +1,48 @@
+use std::time::Instant;
+
+use crossterm::{
+	event::{Event, KeyCode},
+	style::ContentStyle,
+};
+use tortuise::buffer::{Buffer, Cell};
+
 fn main() {
-    println!("Hello, world!");
+	let mut stdout = std::io::stdout().lock();
+	let mut buffer = Buffer::new(&mut stdout).unwrap();
+	let mut last_frame_start = Instant::now();
+	buffer
+		.render_loop(
+			|renderer, event| {
+				if let Event::Key(event) = event
+					&& event.code == KeyCode::Esc
+				{
+					let _ = renderer.finish();
+					std::process::exit(0);
+				}
+			},
+			|renderer| {
+				renderer.cells.clear();
+				let end = Instant::now();
+				let frame_time = (end - last_frame_start).as_micros();
+				let digits = [
+					frame_time % 1_000_000 / 100_000,
+					frame_time % 100_000 / 10_000,
+					frame_time % 10_000 / 1_000,
+					frame_time % 1_000 / 100,
+					frame_time % 100 / 10,
+					frame_time % 10,
+				];
+				for (x, digit) in digits.into_iter().enumerate() {
+					renderer.cells.push(Cell {
+						character: char::from_digit(digit as u32, 10).unwrap(),
+						x: x as u16,
+						y: 0,
+						z: 0,
+						style: ContentStyle::new(),
+					});
+				}
+				last_frame_start = Instant::now();
+			},
+		)
+		.unwrap();
 }
-- 
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