Code cleanup for TouchScreenMode

Changes.md

@@ -44,6 +44,11 @@ Some minor changes:
 * The game window maximizes on startup to fill the screen.
 * Fixed a few places where the old "Load Level" menu was being called instead
   of the fancy new one with the listbox.
+* Fixed a touch screen detection bug that was causing the mouse cursor to hide
+  on Macbooks when using their touchpad.
+* Add a `--touch` command line flag to the game binary, which forces touch screen
+  mode to always be on (which hides the mouse cursor), in case of touch screen
+  detection errors or annoyances.
 
 Some code cleanup and architecture changes:
 

cmd/doodle/main.go

@@ -19,6 +19,7 @@ import (
 	"git.kirsle.net/SketchyMaze/doodle/pkg/chatbot"
 	"git.kirsle.net/SketchyMaze/doodle/pkg/gamepad"
 	"git.kirsle.net/SketchyMaze/doodle/pkg/log"
+	"git.kirsle.net/SketchyMaze/doodle/pkg/native"
 	"git.kirsle.net/SketchyMaze/doodle/pkg/plus/bootstrap"
 	"git.kirsle.net/SketchyMaze/doodle/pkg/plus/dpp"
 	"git.kirsle.net/SketchyMaze/doodle/pkg/shmem"
@@ -101,6 +102,11 @@ func main() {
 			Aliases: []string{"w"},
 			Usage:   "set the window size (e.g. -w 1024x768) or special value: desktop, mobile, landscape, maximized",
 		},
+		&cli.BoolFlag{
+			Name:    "touch",
+			Aliases: []string{"t"},
+			Usage:   "force TouchScreenMode to be on at all times, which hides the mouse cursor",
+		},
 		&cli.BoolFlag{
 			Name:  "guitest",
 			Usage: "enter the GUI Test scene on startup",
@@ -167,10 +173,9 @@ func main() {
 			balance.FeaturesOn()
 		}
 
-		// Offline mode?
-		if c.Bool("offline") {
-			shmem.OfflineMode = true
-		}
+		// Set other program flags.
+		shmem.OfflineMode = c.Bool("offline")
+		native.ForceTouchScreenModeAlwaysOn = c.Bool("touch")
 
 		// SDL engine.
 		engine := sdl.New(

pkg/balance/numbers.go

@@ -31,6 +31,10 @@ var (
 		Y: 60,
 	}
 
+	// Threshold of how many ticks should pass between the last Fingers Up
+	// event and a mouse movement, to indicate that TouchScreenMode should end.
+	TouchScreenModeLastFingerDownTicks uint64 = 10
+
 	// Player speeds, gravity and movement physics.
 	PlayerMaxVelocity       float64 = 7
 	PlayerJumpVelocity      float64 = -15

pkg/native/touch_screen.go

@@ -1,6 +1,7 @@
 package native
 
 import (
+	"git.kirsle.net/SketchyMaze/doodle/pkg/balance"
 	"git.kirsle.net/SketchyMaze/doodle/pkg/log"
 	"git.kirsle.net/SketchyMaze/doodle/pkg/shmem"
 	"git.kirsle.net/go/render/event"
@@ -9,13 +10,16 @@ import (
 // Common code to handle basic touch screen detection.
 
 var (
+	// Force the TouchScreenMode to always be enabled.
+	ForceTouchScreenModeAlwaysOn bool
+
 	isTouchScreenMode  bool
 	lastFingerDownTick uint64
 )
 
 // IsTouchScreenMode is activated when the user has touched the screen, and false when the mouse is moved.
 func IsTouchScreenMode() bool {
-	return isTouchScreenMode
+	return ForceTouchScreenModeAlwaysOn || isTouchScreenMode
 }
 
 /*
@@ -51,7 +55,7 @@ func UpdateTouchScreenMode(ev *event.State) {
 
 			// If we have registered a mouse event a few ticks after the finger was
 			// removed, it is a real mouse cursor and we exit touch screen mode.
-			if ev.IsMouseEvent && shmem.Tick-lastFingerDownTick > 5 {
+			if ev.IsMouseEvent && shmem.Tick-lastFingerDownTick > balance.TouchScreenModeLastFingerDownTicks {
 				log.Info("TouchScreenMode OFF")
 				isTouchScreenMode = false
 			}