From dae5bc02b1c934075e95694953b4330676e21611 Mon Sep 17 00:00:00 2001
From: Nathan Reiner <nathan@nathanreiner.xyz>
Date: Fri, 7 Feb 2025 20:39:58 +0100
Subject: estd: add graphics module

---
 src/screen/main.zig | 90 ++++++++++++++++++++++-------------------------------
 1 file changed, 38 insertions(+), 52 deletions(-)

(limited to 'src/screen/main.zig')

diff --git a/src/screen/main.zig b/src/screen/main.zig
index 0514210..7b73450 100644
--- a/src/screen/main.zig
+++ b/src/screen/main.zig
@@ -1,5 +1,6 @@
 const std = @import("std");
 const drm = @import("drm/root.zig");
+const graphics = @import("estd").graphics;
 
 pub fn main() !void {
 	var gpa = std.heap.GeneralPurposeAllocator(.{}){};
@@ -11,14 +12,15 @@ pub fn main() !void {
 	var resources = try card.resources();
 	defer resources.deinit();
 
-	var connector = try card.connector(resources.connector_ids[0]);
+	var connector = try resources.connector(0);
 	defer connector.deinit();
 
-	const mode = connector.modes[0];
+	const mode = connector.modes[12];
+	std.debug.print("using mode: {s}@{d:.2}\n", .{mode.name, mode.frame_rate()});
 
-	var crtc = try card.crtc(resources.crtc_ids[
+	var crtc = try resources.crtc(
 		connector.compatible_crtc() orelse @panic("no crtc found")
-	]);
+	);
 	defer crtc.detach();
 
 	var buffer = try card.create_buffer(mode.horizontal.size, mode.vertical.size);
@@ -26,62 +28,46 @@ pub fn main() !void {
 
 	try crtc.attach(&buffer, &connector, mode);
 
-	const Pos = struct { x: f32, y: f32 };
+	const center_x: i64 = @intCast(buffer.current.width / 2 - 100);
+	const center_y: i64 = @intCast(buffer.current.height / 2 - 100);
 
-	var vec = Pos { .x = 10, .y = 10 };
-	var pos = Pos { .x = 0, .y = 0 };
-	var delta: f32 = 0;
-	const size = 100;
+	var box = graphics.Box {
+		.x = @intCast(center_x),
+		.y = @intCast(center_y),
+		.width = 200,
+		.height = 200,
+		.color = .{ .red = 0xff, .green = 0x05, .blue = 0x07 },
+		.radius = 0,
+	};
 
-	const width: f32 = @floatFromInt(buffer.current.width);
-	const height: f32 = @floatFromInt(buffer.current.height);
+	var last_duration: f64 = 0;
+	var dir: f64 = 1;
+	var delta: f64 = 0;
+	var radius: f64 = 0;
 
 	while (true) {
 		const start = try std.time.Instant.now();
-
-		@memset(
-			buffer.current.pixels,
-			.{
-				.red = 0x25,
-				.green = 0x25,
-				.blue = 0x25
-			}
-		);
-
-		pos.x += vec.x * delta;
-		pos.y += vec.y * delta;
-
-		if (pos.x < 0) {
-			pos.x = -pos.x;
-			vec.x = -vec.x;
-		} else if (pos.x + size >= width) {
-			pos.x = width - size;
-			vec.x = -vec.x;
-		}
-
-		if (pos.y < 0) {
-			pos.y = -pos.y;
-			vec.y = -vec.y;
-		} else if (pos.y + size >= height) {
-			pos.y = height - size;
-			vec.y = -vec.y;
-		}
-
-		for (0..size) |w| {
-			for (0..size) |h| {
-				const x = @as(usize, @intFromFloat(pos.x)) + w;
-				const y = @as(usize, @intFromFloat(pos.y)) + h;
-				buffer.current.pixels[x + buffer.current.width * y] = .{
-					.red = 0xff,
-					.green = 0,
-					.blue = 0,
-				};
-			}
+		const canvas = buffer.canvas();
+		canvas.fill(.{ .red = 0x25, .green = 0x25, .blue = 0x25 });
+		box.render(&canvas);
+
+		radius += delta * dir;
+		if (radius > 100) {
+			std.debug.print("HERE\n", .{});
+			radius = 100;
+			dir = -1;
+		} else if (radius < 0) {
+			radius = 0;
+			dir = 1;
 		}
+		box.radius = @intFromFloat(radius);
 
 		const end = try std.time.Instant.now();
-		const elapsed = (@as(f32, @floatFromInt(end.since(start))) / std.time.ns_per_s);
-		delta = elapsed * 60;
+		const duration: f64 = @floatFromInt(end.since(start));
+		const average = (duration + last_duration) / 2;
+		last_duration = duration;
+		std.debug.print("@FPS: {d:.3}\r", .{ std.time.ns_per_s / average });
+		delta = 60 * last_duration / std.time.ns_per_s;
 
 		try crtc.page_flip(&buffer);
 
-- 
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