[Linux/Windows] Set pressure to 1.0f when primary button is pressed and device is not pressure sensitive.

(cherry picked from commit 012894789443dbb4f1882c11fd08b4c2f1618a0f)

platform/windows/os_windows.cpp

@@ -446,6 +446,7 @@ LRESULT OS_Windows::WndProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
 				mm->set_control(control_mem);
 				mm->set_shift(shift_mem);
 				mm->set_alt(alt_mem);
+				mm->set_pressure((raw->data.mouse.ulButtons & RI_MOUSE_LEFT_BUTTON_DOWN) ? 1.0f : 0.0f);
 
 				mm->set_button_mask(last_button_state);
 
@@ -554,13 +555,21 @@ LRESULT OS_Windows::WndProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
 			Ref<InputEventMouseMotion> mm;
 			mm.instance();
 
-			mm->set_pressure(pen_info.pressure ? (float)pen_info.pressure / 1024 : 0);
-			mm->set_tilt(Vector2(pen_info.tiltX ? (float)pen_info.tiltX / 90 : 0, pen_info.tiltY ? (float)pen_info.tiltY / 90 : 0));
+			if (pen_info.penMask & PEN_MASK_PRESSURE) {
+				mm->set_pressure((float)pen_info.pressure / 1024);
+			} else {
+				mm->set_pressure((HIWORD(wParam) & POINTER_MESSAGE_FLAG_FIRSTBUTTON) ? 1.0f : 0.0f);
+			}
+			if ((pen_info.penMask & PEN_MASK_TILT_X) && (pen_info.penMask & PEN_MASK_TILT_Y)) {
+				mm->set_tilt(Vector2((float)pen_info.tiltX / 90, (float)pen_info.tiltY / 90));
+			}
 
 			mm->set_control((wParam & MK_CONTROL) != 0);
 			mm->set_shift((wParam & MK_SHIFT) != 0);
 			mm->set_alt(alt_mem);
 
+			mm->set_pressure((wParam & MK_LBUTTON) ? 1.0f : 0.0f);
+
 			mm->set_button_mask(last_button_state);
 
 			POINT coords; //client coords

platform/windows/os_windows.h

@@ -64,6 +64,22 @@ typedef UINT32 POINTER_FLAGS;
 typedef UINT32 PEN_FLAGS;
 typedef UINT32 PEN_MASK;
 
+#ifndef PEN_MASK_PRESSURE
+#define PEN_MASK_PRESSURE 0x00000001
+#endif
+
+#ifndef PEN_MASK_TILT_X
+#define PEN_MASK_TILT_X 0x00000004
+#endif
+
+#ifndef PEN_MASK_TILT_Y
+#define PEN_MASK_TILT_Y 0x00000008
+#endif
+
+#ifndef POINTER_MESSAGE_FLAG_FIRSTBUTTON
+#define POINTER_MESSAGE_FLAG_FIRSTBUTTON 0x00000010
+#endif
+
 enum tagPOINTER_INPUT_TYPE {
 	PT_POINTER = 0x00000001,
 	PT_TOUCH = 0x00000002,

platform/x11/os_x11.cpp

@@ -2085,6 +2085,7 @@ void OS_X11::process_xevents() {
 
 	xi.pressure = 0;
 	xi.tilt = Vector2();
+	xi.pressure_supported = false;
 
 	while (XPending(x11_display) > 0) {
 		XEvent event;
@@ -2137,9 +2138,11 @@ void OS_X11::process_xevents() {
 							Map<int, Vector2>::Element *pen_pressure = xi.pen_pressure_range.find(device_id);
 							if (pen_pressure) {
 								Vector2 pen_pressure_range = pen_pressure->value();
-								if (pen_pressure_range != Vector2())
+								if (pen_pressure_range != Vector2()) {
+									xi.pressure_supported = true;
 									xi.pressure = (*values - pen_pressure_range[0]) /
 												  (pen_pressure_range[1] - pen_pressure_range[0]);
+								}
 							}
 
 							values++;
@@ -2484,7 +2487,11 @@ void OS_X11::process_xevents() {
 				Ref<InputEventMouseMotion> mm;
 				mm.instance();
 
-				mm->set_pressure(xi.pressure);
+				if (xi.pressure_supported) {
+					mm->set_pressure(xi.pressure);
+				} else {
+					mm->set_pressure((get_mouse_button_state() & (1 << (BUTTON_LEFT - 1))) ? 1.0f : 0.0f);
+				}
 				mm->set_tilt(xi.tilt);
 
 				// Make the absolute position integral so it doesn't look _too_ weird :)

platform/x11/os_x11.h

@@ -138,6 +138,7 @@ class OS_X11 : public OS_Unix {
 		XIEventMask all_master_event_mask;
 		Map<int, Vector2> state;
 		double pressure;
+		bool pressure_supported;
 		Vector2 tilt;
 		Vector2 mouse_pos_to_filter;
 		Vector2 relative_motion;