all: move mach.Timer, core Timer/Frequency to mach.time module

Signed-off-by: Stephen Gutekanst <stephen@hexops.com>

src/time/Timer.zig

@@ -0,0 +1,38 @@
+const mach = @import("../main.zig");
+const std = @import("std");
+
+const Timer = @This();
+
+// TODO: support a WASM-based timer as well, which is the primary reason this abstraction exists.
+
+timer: std.time.Timer,
+
+/// Initialize the timer.
+pub fn start() !Timer {
+    return .{ .timer = try std.time.Timer.start() };
+}
+
+/// Reads the timer value since start or the last reset in nanoseconds.
+pub inline fn readPrecise(timer: *Timer) u64 {
+    return timer.timer.read();
+}
+
+/// Reads the timer value since start or the last reset in seconds.
+pub inline fn read(timer: *Timer) f32 {
+    return @as(f32, @floatFromInt(timer.readPrecise())) / @as(f32, @floatFromInt(mach.time.ns_per_s));
+}
+
+/// Resets the timer value to 0/now.
+pub inline fn reset(timer: *Timer) void {
+    timer.timer.reset();
+}
+
+/// Returns the current value of the timer in nanoseconds, then resets it.
+pub inline fn lapPrecise(timer: *Timer) u64 {
+    return timer.timer.lap();
+}
+
+/// Returns the current value of the timer in seconds, then resets it.
+pub inline fn lap(timer: *Timer) f32 {
+    return @as(f32, @floatFromInt(timer.lapPrecise())) / @as(f32, @floatFromInt(mach.time.ns_per_s));
+}