Function Mouse_CheckButtons

src/input/mouse.c:233–261

* Compare mouse button state with previous value, and report changes. * @param newButtonState New button state. * @return \c 0x2D if no change, \c 0x41 for change in first button state, * \c 0x42 for change in second button state, bit 11 means 'button released'. */

 *     \c 0x42 for change in second button state, bit 11 means 'button released'.
 */
uint16 Mouse_CheckButtons(uint16 newButtonState)
{
	uint8 change;
	uint16 result;

	newButtonState &= 0xFF;

	result = 0x2D;
	change = newButtonState ^ g_prevButtonState;
	if (change == 0) return result;

	g_prevButtonState = newButtonState & 0xFF;

	if ((change & 0x2) != 0) {
		result = 0x42;
		if ((newButtonState & 0x2) == 0) {
			result |= 0x800;	/* RELEASE */
		}
	}

	if ((change & 0x1) != 0) {
		result = 0x41;
		if ((newButtonState & 0x1) == 0) {
			result |= 0x800;	/* RELEASE */
		}
	}

	return result;
}

/**
 * If the mouse has moved, update its coordinates, and update the region flags.