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// license:BSD-3-Clause
// copyright-holders:Fabio Priuli
/**********************************************************************
Nintendo Family Computer & Entertainment System Zapper Lightgun
**********************************************************************/
#include "emu.h"
#include "zapper.h"
#include "screen.h"
//**************************************************************************
// DEVICE DEFINITIONS
//**************************************************************************
DEFINE_DEVICE_TYPE(NES_ZAPPER, nes_zapper_device, "nes_zapper", "Nintendo Zapper Lightgun")
static INPUT_PORTS_START( nes_zapper )
PORT_START("ZAPPER_X")
PORT_BIT( 0xff, 0x80, IPT_LIGHTGUN_X) PORT_CROSSHAIR(X, 1.0, 0.0, 0) PORT_SENSITIVITY(70) PORT_KEYDELTA(30) PORT_MINMAX(0,255)
PORT_START("ZAPPER_Y")
PORT_BIT( 0xff, 0x80, IPT_LIGHTGUN_Y) PORT_CROSSHAIR(Y, 1.0, 0.0, 0) PORT_SENSITIVITY(50) PORT_KEYDELTA(30) PORT_MINMAX(0,255)
PORT_START("ZAPPER_T")
PORT_BIT( 0x10, IP_ACTIVE_HIGH, IPT_BUTTON1) PORT_NAME("Lightgun Trigger")
INPUT_PORTS_END
//-------------------------------------------------
// input_ports - device-specific input ports
//-------------------------------------------------
ioport_constructor nes_zapper_device::device_input_ports() const
{
return INPUT_PORTS_NAME( nes_zapper );
}
//**************************************************************************
// LIVE DEVICE
//**************************************************************************
//-------------------------------------------------
// nes_zapper_device - constructor
//-------------------------------------------------
nes_zapper_device::nes_zapper_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) :
device_t(mconfig, NES_ZAPPER, tag, owner, clock),
device_video_interface(mconfig, *this),
device_nes_control_port_interface(mconfig, *this),
m_lightx(*this, "ZAPPER_X"),
m_lighty(*this, "ZAPPER_Y"),
m_trigger(*this, "ZAPPER_T")
{
}
//-------------------------------------------------
// device_start
//-------------------------------------------------
void nes_zapper_device::device_start()
{
}
//-------------------------------------------------
// device_reset
//-------------------------------------------------
void nes_zapper_device::device_reset()
{
}
//-------------------------------------------------
// read
//-------------------------------------------------
uint8_t nes_zapper_device::read_bit34()
{
uint8_t ret = m_trigger->read();
// get the pixel at the gun position
rgb_t pix = screen().pixel(m_lightx->read(), m_lighty->read());
// check if the cursor is over a bright pixel
// FIXME: still a gross hack
if (pix.r() == 0xff && pix.b() == 0xff && pix.g() > 0x90)
ret &= ~0x08; // sprite hit
else
ret |= 0x08; // no sprite hit
return ret;
}
uint8_t nes_zapper_device::read_exp(offs_t offset)
{
uint8_t ret = 0;
if (offset == 1) // $4017
ret |= nes_zapper_device::read_bit34();
return ret;
}
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