/**
* @brief return the mouse motion flags
*
* Advance the mouse x and y coordinates to the dx and dy
* coordinates by either toggling MX2 or MX1 first for a
* y movement, or MY2 or MY1 for x movement.
* There are four read phases counted by m_mouse.phase
*
* @return lookup value from madr_a32
*/
UINT16 alto2_cpu_device::mouse_read()
{
UINT16 data;
m_mouse.latch = (m_mouse.latch << 1) & MLATCH;
data = m_madr_a32[m_mouse.latch];
switch (m_mouse.phase) {
case 0:
m_mouse.latch ^= MOVEX(m_mouse.dx - m_mouse.x);
m_mouse.latch ^= MOVEY(m_mouse.dy - m_mouse.y);
break;
case 1:
m_mouse.latch |= MACTIVE;
m_mouse.x += SIGN(m_mouse.dx - m_mouse.x);
m_mouse.y += SIGN(m_mouse.dy - m_mouse.y);
break;
case 2:
m_mouse.latch ^= MOVEX(m_mouse.dx - m_mouse.x);
m_mouse.latch ^= MOVEY(m_mouse.dy - m_mouse.y);
break;
case 3:
m_mouse.latch |= MACTIVE;
m_mouse.x += SIGN(m_mouse.dx - m_mouse.x);
m_mouse.y += SIGN(m_mouse.dy - m_mouse.y);
}
m_mouse.phase = (m_mouse.phase + 1) % 4;
return data;
}
/**
* @brief return the mouse motion flags
*
* Advance the mouse x and y coordinates to the dx and dy
* coordinates by either toggling MX2 or MX1 first for a
* y movement, MY2 or MY1 for x movement.
*
* @result lookup value from madr_a32
*/
int mouse_read(void)
{
static int arg;
int data;
mouse.latch = (mouse.latch << 1) & MLATCH;
data = madr_a32[mouse.latch];
switch (arg & 3) {
case 0:
mouse.latch |= MOVEX(mouse.dx - mouse.x);
mouse.latch |= MOVEY(mouse.dy - mouse.y);
break;
case 1:
mouse.latch |= MACTIVE;
if (mouse.x < mouse.dx)
mouse.x++;
else if (mouse.x > mouse.dx)
mouse.x--;
if (mouse.y < mouse.dy)
mouse.y++;
else if (mouse.y > mouse.dy)
mouse.y--;
break;
case 2:
mouse.latch ^= MOVEX(mouse.dx - mouse.x);
mouse.latch ^= MOVEY(mouse.dy - mouse.y);
break;
default:
mouse.latch &= ~MACTIVE;
if (mouse.x < mouse.dx)
mouse.x++;
else if (mouse.x > mouse.dx)
mouse.x--;
if (mouse.y < mouse.dy)
mouse.y++;
else if (mouse.y > mouse.dy)
mouse.y--;
}
arg++;
return data;
}
