Add option to disable native pen/touch support

src/config.cpp

@@ -428,6 +428,7 @@ namespace config {
     true,  // controller enabled
     true,  // always send scancodes
     true,  // high resolution scrolling
+    true,  // native pen/touch support
   };
 
   sunshine_t sunshine {
@@ -1061,6 +1062,8 @@ namespace config {
     bool_f(vars, "always_send_scancodes", input.always_send_scancodes);
 
     bool_f(vars, "high_resolution_scrolling", input.high_resolution_scrolling);
+    bool_f(vars, "native_pen_touch", input.native_pen_touch);
+
     int port = sunshine.port;
     int_between_f(vars, "port"s, port, { 1024 + nvhttp::PORT_HTTPS, 65535 - rtsp_stream::RTSP_SETUP_PORT });
     sunshine.port = (std::uint16_t) port;

src/config.h

@@ -123,6 +123,7 @@ namespace config {
     bool always_send_scancodes;
 
     bool high_resolution_scrolling;
+    bool native_pen_touch;
   };
 
   namespace flag {

src/platform/windows/input.cpp

@@ -1720,7 +1720,9 @@ namespace platf {
 
     // We support pen and touch input on Win10 1809+
     if (GetProcAddress(GetModuleHandleA("user32.dll"), "CreateSyntheticPointerDevice") != nullptr) {
-      caps |= platform_caps::pen_touch;
+      if (config::input.native_pen_touch) {
+        caps |= platform_caps::pen_touch;
+      }
     }
     else {
       BOOST_LOG(warning) << "Touch input requires Windows 10 1809 or later"sv;