From b20f61105812fa03945cf517a5d613aa2af8b484 Mon Sep 17 00:00:00 2001
From: Hajime Hoshi <hajimehoshi@gmail.com>
Date: Sun, 20 Dec 2020 20:25:18 +0900
Subject: [PATCH] uidriver/js: Implement touches on go2cpp

---
 internal/uidriver/js/input_js.go | 20 ++++++++++++++++++++
 internal/uidriver/js/ui_js.go    |  1 +
 2 files changed, 21 insertions(+)

diff --git a/internal/uidriver/js/input_js.go b/internal/uidriver/js/input_js.go
index a56d2905f..fa245cfd5 100644
--- a/internal/uidriver/js/input_js.go
+++ b/internal/uidriver/js/input_js.go
@@ -395,3 +395,23 @@ func (i *Input) updateTouchesFromEvent(e js.Value) {
 	}
 	i.touches = ts
 }
+
+func (i *Input) updateForGo2Cpp() {
+	if !go2cpp.Truthy() {
+		return
+	}
+
+	i.touches = map[driver.TouchID]pos{}
+	maxID := go2cpp.Get("maxTouchId").Int()
+	for id := 0; id < maxID; id++ {
+		x := go2cpp.Call("getTouchPositionX", id)
+		y := go2cpp.Call("getTouchPositionY", id)
+		if x.Type() != js.TypeNumber || y.Type() != js.TypeNumber {
+			continue
+		}
+		i.touches[driver.TouchID(id)] = pos{
+			X: x.Int(),
+			Y: y.Int(),
+		}
+	}
+}
diff --git a/internal/uidriver/js/ui_js.go b/internal/uidriver/js/ui_js.go
index 73c8c03db..3a52baaf0 100644
--- a/internal/uidriver/js/ui_js.go
+++ b/internal/uidriver/js/ui_js.go
@@ -182,6 +182,7 @@ func (u *UserInterface) update() error {
 	hooks.ResumeAudio()
 
 	u.input.updateGamepads()
+	u.input.updateForGo2Cpp()
 	u.updateSize()
 	if err := u.context.Update(); err != nil {
 		return err