fix export blending issue (just disabled blend in equirectangular drawing), and cleanup a bit

engine/wacom.h

@@ -9,6 +9,7 @@
 
 class WacomTablet
 {
+public:
     HCTX g_hCtx = NULL;
     AXIS TabletPressure = { 0 };
     LOGCONTEXTA glogContext = { 0 };
@@ -19,7 +20,7 @@ class WacomTablet
     bool m_mouse_down = false;
 
     HCTX TabletInit(HWND hWnd);
-public:
+    
     static WacomTablet I;
     bool init(HWND hWnd);
     void terminate();