Fix some mouse bugs in WebAssembly/asm.js

 - Emit mouse wheel release events
 - Set button masks, fixes #5092

platform/javascript/javascript_main.cpp

@@ -66,11 +66,12 @@ static void _glut_mouse_button(int button, int state, int x, int y) {
 
 	if (ev.mouse_button.button_index<4) {
 		if (ev.mouse_button.pressed) {
-			_mouse_button_mask|=1<<ev.mouse_button.button_index;
+			_mouse_button_mask |= 1 << (ev.mouse_button.button_index-1);
 		} else {
-			_mouse_button_mask&=~(1<<ev.mouse_button.button_index);
+			_mouse_button_mask &= ~(1 << (ev.mouse_button.button_index-1));
 		}
 	}
+	ev.mouse_button.button_mask=_mouse_button_mask;
 
 	uint32_t m = glutGetModifiers();
 	ev.mouse_button.mod.alt=(m&GLUT_ACTIVE_ALT)!=0;
@@ -79,6 +80,11 @@ static void _glut_mouse_button(int button, int state, int x, int y) {
 
 	os->push_input(ev);
 
+	if (ev.mouse_button.button_index==BUTTON_WHEEL_UP || ev.mouse_button.button_index==BUTTON_WHEEL_DOWN) {
+		// GLUT doesn't send release events for mouse wheel, so send manually
+		ev.mouse_button.pressed=false;
+		os->push_input(ev);
+	}
 }
 
 
@@ -162,7 +168,6 @@ int main(int argc, char *argv[]) {
 
 	glutMouseFunc(_glut_mouse_button);
 	glutMotionFunc(_glut_mouse_motion);
-	glutMotionFunc(_glut_mouse_motion);
 	glutPassiveMotionFunc(_glut_mouse_motion);
 
 

platform/javascript/os_javascript.cpp

@@ -299,13 +299,15 @@ bool OS_JavaScript::is_mouse_grab_enabled() const {
 	//*sigh* technology has evolved so much since i was a kid..
 	return false;
 }
+
 Point2 OS_JavaScript::get_mouse_pos() const {
 
-	return Point2();
+	return input->get_mouse_pos();
 }
+
 int OS_JavaScript::get_mouse_button_state() const {
 
-	return 0;
+	return last_button_mask;
 }
 
 void OS_JavaScript::set_window_title(const String& p_title) {
@@ -427,6 +429,9 @@ void OS_JavaScript::push_input(const InputEvent& p_ev) {
 	if (ev.type==InputEvent::MOUSE_MOTION) {
 		input->set_mouse_pos(Point2(ev.mouse_motion.x, ev.mouse_motion.y));
 	}
+	else if (ev.type==InputEvent::MOUSE_BUTTON) {
+		last_button_mask = ev.mouse_button.button_mask;
+	}
 	input->parse_input_event(p_ev);
 }
 
@@ -765,6 +770,7 @@ OS_JavaScript::OS_JavaScript(GFXInitFunc p_gfx_init_func,void*p_gfx_init_ud, Get
 
 	gfx_init_func=p_gfx_init_func;
 	gfx_init_ud=p_gfx_init_ud;
+	last_button_mask=0;
 	main_loop=NULL;
 	last_id=1;
 	gl_extensions=NULL;

platform/javascript/os_javascript.h

@@ -59,6 +59,7 @@ private:
 
 	Vector<TouchPos> touch;
 	Point2 last_mouse;
+	int last_button_mask;
 	unsigned int last_id;
 	GFXInitFunc gfx_init_func;
 	void*gfx_init_ud;