diff options
Diffstat (limited to 'src/devices/bus/snes_ctrl/mouse.c')
-rw-r--r-- | src/devices/bus/snes_ctrl/mouse.c | 239 |
1 files changed, 239 insertions, 0 deletions
diff --git a/src/devices/bus/snes_ctrl/mouse.c b/src/devices/bus/snes_ctrl/mouse.c new file mode 100644 index 00000000000..535b68d02bb --- /dev/null +++ b/src/devices/bus/snes_ctrl/mouse.c @@ -0,0 +1,239 @@ +// license:BSD-3-Clause +// copyright-holders:Fabio Priuli +/********************************************************************** + + Nintendo Super Famicom & SNES Mouse + +**********************************************************************/ + +#include "mouse.h" + +//************************************************************************** +// DEVICE DEFINITIONS +//************************************************************************** + +const device_type SNES_MOUSE = &device_creator<snes_mouse_device>; + + +static INPUT_PORTS_START( snes_mouse ) + PORT_START("BUTTONS") + PORT_BIT( 0x00ff, IP_ACTIVE_HIGH, IPT_SPECIAL ) // these must be 0! + PORT_BIT( 0x0100, IP_ACTIVE_HIGH, IPT_BUTTON2 ) PORT_NAME("Button Right") + PORT_BIT( 0x0200, IP_ACTIVE_HIGH, IPT_BUTTON1 ) PORT_NAME("Button Left") + PORT_BIT( 0x0c00, IP_ACTIVE_HIGH, IPT_UNUSED ) // mouse speed: 0 = slow, 1 = normal, 2 = fast, 3 = unused + PORT_BIT( 0x1000, IP_ACTIVE_HIGH, IPT_UNUSED ) + PORT_BIT( 0x2000, IP_ACTIVE_HIGH, IPT_UNUSED ) + PORT_BIT( 0x4000, IP_ACTIVE_HIGH, IPT_UNUSED ) + PORT_BIT( 0x8000, IP_ACTIVE_LOW, IPT_UNUSED ) + + // we use IPT_LIGHTGUN instead of IPT_MOUSE to avoid input to wrap when you reach the screen border + // due to the relative nature of movement detection in SNES mouse, when we wrap the system would + // detect a sudden jump in the wrong direction, making the usage unfriendly... + PORT_START("MOUSE_X") + PORT_BIT( 0x1ff, 0x100, IPT_LIGHTGUN_X ) PORT_NAME("Superscope X Axis") PORT_SENSITIVITY(30) PORT_KEYDELTA(5) +// PORT_BIT( 0xff, 0x00, IPT_MOUSE_X) PORT_SENSITIVITY(30) PORT_KEYDELTA(5) + + PORT_START("MOUSE_Y") + PORT_BIT( 0x1ff, 0x100, IPT_LIGHTGUN_Y) PORT_NAME("Superscope Y Axis") PORT_SENSITIVITY(30) PORT_KEYDELTA(5) +// PORT_BIT( 0xff, 0x00, IPT_MOUSE_Y) PORT_SENSITIVITY(30) PORT_KEYDELTA(5) +INPUT_PORTS_END + + +//------------------------------------------------- +// input_ports - device-specific input ports +//------------------------------------------------- + +ioport_constructor snes_mouse_device::device_input_ports() const +{ + return INPUT_PORTS_NAME( snes_mouse ); +} + + + +//************************************************************************** +// LIVE DEVICE +//************************************************************************** + +//------------------------------------------------- +// snes_mouse_device - constructor +//------------------------------------------------- + +snes_mouse_device::snes_mouse_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) : + device_t(mconfig, SNES_MOUSE, "Nintendo SNES / SFC Mouse Controller", tag, owner, clock, "snes_mouse", __FILE__), + device_snes_control_port_interface(mconfig, *this), + m_buttons(*this, "BUTTONS"), + m_xaxis(*this, "MOUSE_X"), + m_yaxis(*this, "MOUSE_Y") +{ +} + + +//------------------------------------------------- +// device_start - device-specific startup +//------------------------------------------------- + +void snes_mouse_device::device_start() +{ + save_item(NAME(m_strobe)); + save_item(NAME(m_idx)); + save_item(NAME(m_latch)); + save_item(NAME(m_x)); + save_item(NAME(m_y)); + save_item(NAME(m_oldx)); + save_item(NAME(m_oldy)); + save_item(NAME(m_deltax)); + save_item(NAME(m_deltay)); + save_item(NAME(m_speed)); + save_item(NAME(m_dirx)); + save_item(NAME(m_diry)); +} + + +//------------------------------------------------- +// device_reset - device-specific reset +//------------------------------------------------- + +void snes_mouse_device::device_reset() +{ + m_strobe = 0; + m_idx = 0; + m_latch = 0; + m_x = 0; + m_y = 0; + m_oldx = 0; + m_oldy = 0; + m_deltax = 0; + m_deltay = 0; + m_speed = 0; + m_dirx = -1; + m_diry = -1; +} + + +//------------------------------------------------- +// poll +//------------------------------------------------- + +void snes_mouse_device::port_poll() +{ + INT16 var; + int new_dir; + m_idx = 0; + m_latch = m_buttons->read(); + + m_oldx = m_x; + m_oldy = m_y; + m_x = m_xaxis->read(); + m_y = m_yaxis->read(); + + var = m_x - m_oldx; + if (var) + { + new_dir = (var < 0) ? 1 : 0; + if (m_dirx != new_dir) + m_dirx = new_dir; + } + + if (var < -127) + { + m_deltax = 0x7f; + m_oldx -= 127; + } + else if (var < 0) + { + m_deltax = -var; + m_oldx = m_x; + } + else if (var > 127) + { + m_deltax = 0x7f; + m_oldx += 127; + } + else + { + m_deltax = var; + m_oldx = m_x; + } + + var = m_y - m_oldy; + if (var) + { + new_dir = (var < 0) ? 1 : 0; + if (m_diry != new_dir) + m_diry = new_dir; + } + + if (var < -127) + { + m_deltay = 0x7f; + m_oldy -= 127; + } + else if (var < 0) + { + m_deltay = -var; + m_oldy = m_y; + } + else if (var > 127) + { + m_deltay = 0x7f; + m_oldy += 127; + } + else + { + m_deltay = var; + m_oldy = m_y; + } + + m_deltax |= (m_dirx << 7); + m_deltay |= (m_diry << 7); +} + +//------------------------------------------------- +// read +//------------------------------------------------- + +UINT8 snes_mouse_device::read_pin4() +{ + UINT8 res = 0; + + if (m_strobe == 1) + { + // reading with strobe 1, changes mouse speed + m_speed = (m_speed + 1) % 3; + return res; + } + + if (m_idx >= 32) + res |= 0x01; + else if (m_idx >= 24) + res |= BIT(m_deltax, (31 - m_idx++)); + else if (m_idx >= 16) + res |= BIT(m_deltay, (23 - m_idx++)); + else if (m_idx == 11) + { + res |= BIT(m_speed, 0); + m_idx++; + } + else if (m_idx == 10) + { + res |= BIT(m_speed, 1); + m_idx++; + } + else + res |= BIT(m_latch, m_idx++); + + return res; +} + +//------------------------------------------------- +// write +//------------------------------------------------- + +void snes_mouse_device::write_strobe(UINT8 data) +{ + int old = m_strobe; + m_strobe = data & 0x01; + + if (m_strobe < old) // 1 -> 0 transition + port_poll(); +} |