clock: Move now() from loop to clock

internal/clock/clock.go

@@ -72,20 +72,22 @@ func updateFPS(now int64) {
 
 // Update updates the inner clock state and returns an integer value
 // indicating how many logical frames the game should update.
-func Update(now int64) int {
+func Update() int {
 	m.Lock()
 	defer m.Unlock()
 
+	n := now()
+
 	if ping != nil {
 		ping()
 	}
 
 	// Initialize logicalTime if needed.
 	if logicalTime == 0 {
-		logicalTime = now
+		logicalTime = n
 	}
 
-	t := now - logicalTime
+	t := n - logicalTime
 	if t < 0 {
 		return 0
 	}
@@ -134,12 +136,12 @@ func Update(now int64) int {
 
 	frames += int64(count)
 	if sync {
-		logicalTime = now
+		logicalTime = n
 	} else {
 		logicalTime += int64(count) * int64(time.Second) / FPS
 	}
 
-	updateFPS(now)
+	updateFPS(n)
 
 	return count
 }

internal/clock/now_js.go

@@ -14,7 +14,7 @@
 
 // +build js
 
-package loop
+package clock
 
 import (
 	"time"

internal/clock/now_notjs.go

@@ -14,7 +14,7 @@
 
 // +build !js
 
-package loop
+package clock
 
 import (
 	"time"

internal/loop/run.go

@@ -57,9 +57,7 @@ func Update(u Updater) error {
 }
 
 func (c *runContext) update(u Updater) error {
-	n := now()
-
-	count := clock.Update(n)
+	count := clock.Update()
 	if err := u.Update(count); err != nil {
 		return err
 	}