From babba295a9c2e32bbab2789f40a6f332fde0c972 Mon Sep 17 00:00:00 2001
From: Cameron Gutman <aicommander@gmail.com>
Date: Sat, 16 Sep 2023 01:13:40 -0500
Subject: [PATCH] Add native touch support

---
 input.cpp     | 46 ++++++++++++++++++++++++++++++++++++++++++++++
 moonlight.hpp |  1 +
 2 files changed, 47 insertions(+)

diff --git a/input.cpp b/input.cpp
index 0db7f60..aa2c4c9 100644
--- a/input.cpp
+++ b/input.cpp
@@ -163,7 +163,53 @@ void MoonlightInstance::ReportMouseMovement() {
     }
 }
 
+bool MoonlightInstance::TryHandleNativeTouchEvent(const pp::InputEvent& event) {
+    // Check if the host supports native pen/touch events
+    if (!(LiGetHostFeatureFlags() & LI_FF_PEN_TOUCH_EVENTS)) {
+        return false;
+    }
+
+    uint8_t eventType;
+    switch (event.GetType()) {
+    case PP_INPUTEVENT_TYPE_TOUCHSTART:
+        eventType = LI_TOUCH_EVENT_DOWN;
+        break;
+    case PP_INPUTEVENT_TYPE_TOUCHMOVE:
+        eventType = LI_TOUCH_EVENT_MOVE;
+        break;
+    case PP_INPUTEVENT_TYPE_TOUCHEND:
+        eventType = LI_TOUCH_EVENT_UP;
+        break;
+    case PP_INPUTEVENT_TYPE_TOUCHCANCEL:
+        eventType = LI_TOUCH_EVENT_CANCEL;
+        break;
+    default:
+        // Not a touch event
+        return false;
+    }
+
+    pp::TouchInputEvent touchEvent(event);
+    uint32_t count = touchEvent.GetTouchCount(PP_TOUCHLIST_TYPE_CHANGEDTOUCHES);
+    for (uint32_t i = 0; i < count; i++) {
+        pp::TouchPoint touchPoint = touchEvent.GetTouchByIndex(PP_TOUCHLIST_TYPE_CHANGEDTOUCHES, i);
+        pp::FloatPoint touchPos = touchPoint.position();
+        LiSendTouchEvent(eventType, touchPoint.id(),
+                         MIN(MAX(touchPos.x(), 0), m_PluginRect.width()),
+                         MIN(MAX(touchPos.y(), 0), m_PluginRect.height()),
+                         touchPoint.pressure(),
+                         0.0f, 0.0f,
+                         touchPoint.rotation_angle());
+    }
+
+    return true;
+}
+
 bool MoonlightInstance::HandleInputEvent(const pp::InputEvent& event) {
+    // If the host can handle native touch events, send them natively
+    if (TryHandleNativeTouchEvent(event)) {
+        return true;
+    }
+
     switch (event.GetType()) {
         case PP_INPUTEVENT_TYPE_MOUSEDOWN: {
             // Lock the mouse cursor when the user clicks on the stream
diff --git a/moonlight.hpp b/moonlight.hpp
index ae3e72d..2fc5e60 100644
--- a/moonlight.hpp
+++ b/moonlight.hpp
@@ -103,6 +103,7 @@ class MoonlightInstance : public pp::Instance, public pp::MouseLock {
         void PairCallback(int32_t /*result*/, int32_t callbackId, pp::VarArray args);
         void STUNCallback(int32_t /*result*/, int32_t callbackId, pp::VarArray args);
     
+        bool TryHandleNativeTouchEvent(const pp::InputEvent& event);
         bool HandleInputEvent(const pp::InputEvent& event);
         void ReportMouseMovement();