build.zig

@@ -15,7 +15,7 @@ const Project = struct {
 	pub fn find_demos(self: Project, b: *std.Build) !void {
 		const demos = b.step("demos", "Build demos");
 
-		var dir = try std.fs.cwd().openDir(b.path("demos/").getPath(b), .{
+		var dir = try std.fs.cwd().openDir("demos/", .{
 			.iterate = true,
 		});
 

demos/inputs.zig

@@ -41,9 +41,9 @@ pub const main = ona.App.setup.
 	with_system(.render, ona.system_fn(render), .{.label = "render visuals"}).
 	with_system(.exit, ona.system_fn(cleanup), .{.label = "clean up visuals"}).build();
 
-fn update(visuals: ona.Write(Visuals), events: ona.Receive(hid.Event), display: ona.Read(gfx.Display)) !void {
-	update_spawned(&visuals.state.spawned_keyboards);
-	update_spawned(&visuals.state.spawned_mouses);
+fn update(visuals: ona.Write(Visuals), app: ona.Read(ona.App), events: ona.Receive(hid.Event), display: ona.Read(gfx.Display)) !void {
+	update_spawned(&visuals.state.spawned_keyboards, @floatCast(app.state.delta_time));
+	update_spawned(&visuals.state.spawned_mouses, @floatCast(app.state.delta_time));
 
 	const random = visuals.state.random.random();
 	const width: f32 = @floatFromInt(display.state.width);
@@ -85,11 +85,11 @@ fn update(visuals: ona.Write(Visuals), events: ona.Receive(hid.Event), display:
 	}
 }
 
-fn update_spawned(spawned: *ona.stack.Parallel(Spawned)) void {
-	const float_speed = 6;
+fn update_spawned(spawned: *ona.stack.Parallel(Spawned), delta_time: f32) void {
+	const float_speed = 50;
 
 	for (spawned.values.slice(.transform)) |*transform| {
-		transform.* = transform.translated(.{0, -float_speed});
+		transform.* = transform.translated(.{0, float_speed * -delta_time});
 	}
 
 	{
@@ -99,7 +99,7 @@ fn update_spawned(spawned: *ona.stack.Parallel(Spawned)) void {
 		while (index < range) : (index += 1) {
 			const lifetime_seconds = spawned.values.get(.lifetime_seconds, index).?;
 
-			lifetime_seconds.* -= 1.0 / 60.0;
+			lifetime_seconds.* -= delta_time;
 
 			if (lifetime_seconds.* <= 0) {
 				range -= 1;

readme.md

@@ -9,7 +9,6 @@
 1. [Technical Details](#technical-details)
     1. [Requirements](#requirements)
     1. [Building](#building)
-    1. [Packaging](#packaging)
 
 ## Overview
 

src/gfx/colors.zig

@@ -2,6 +2,8 @@ const gfx = @import("./gfx.zig");
 
 pub const black = greyscale(0);
 
+pub const white = greyscale(1);
+
 pub fn greyscale(v: f32) gfx.Color {
 	return .{v, v, v, 1};
 }
@@ -9,5 +11,3 @@ pub fn greyscale(v: f32) gfx.Color {
 pub fn rgb(r: f32, g: f32, b: f32) gfx.Color {
 	return .{r, g, b, 1};
 }
-
-pub const white = greyscale(1);

src/ona/ona.zig

@@ -32,6 +32,7 @@ pub const App = struct {
 	events: *const Events,
 	target_frame_time: f64,
 	elapsed_time: f64,
+	delta_time: f64,
 	is_running: bool,
 
 	pub const Events = struct {
@@ -114,6 +115,7 @@ pub const App = struct {
 						.events = &events,
 						.target_frame_time = 1.0 / 60.0,
 						.elapsed_time = 0,
+						.delta_time = 0,
 						.is_running = true,
 					});
 
@@ -127,11 +129,11 @@ pub const App = struct {
 					while (app.is_running) {
 						const ticks_current = std.time.milliTimestamp();
 						const milliseconds_per_second = 1000.0;
-						const delta_time = @as(f64, @floatFromInt(ticks_current - ticks_previous)) / milliseconds_per_second;
 
+						app.delta_time = @as(f64, @floatFromInt(ticks_current - ticks_previous)) / milliseconds_per_second;
 						app.elapsed_time = @as(f64, @floatFromInt(ticks_current - ticks_initial)) / milliseconds_per_second;
 						ticks_previous = ticks_current;
-						accumulated_time += delta_time;
+						accumulated_time += app.delta_time;
 
 						try world.run_event(events.pre_update);
 
@@ -909,14 +911,6 @@ pub fn system_fn(comptime call: anytype) *const SystemInfo {
 	return system_info;
 }
 
-pub fn thread_restriction(comptime State: type) ThreadRestriction {
-	if (@hasDecl(State, "thread_restriction")) {
-		return State.thread_restriction;
-	}
-
-	return .none;
-}
-
 pub fn type_id(comptime T: type) TypeID {
 	const TypeHandle = struct {
 		comptime {
@@ -928,3 +922,11 @@ pub fn type_id(comptime T: type) TypeID {
 
 	return @enumFromInt(@intFromPtr(&TypeHandle.byte));
 }
+
+pub fn thread_restriction(comptime State: type) ThreadRestriction {
+	if (@hasDecl(State, "thread_restriction")) {
+		return State.thread_restriction;
+	}
+
+	return .none;
+}