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// license:BSD-3-Clause
// copyright-holders:Brad Oliver,Fabio Priuli
/***************************************************************************
video/nes.c
Routines to control the unique NES video hardware/PPU.
***************************************************************************/
#include "emu.h"
#include "includes/nes.h"
void nes_state::video_reset()
{
m_ppu->set_vidaccess_callback(ppu2c0x_device::vidaccess_delegate(FUNC(nes_state::nes_ppu_vidaccess),this));
}
void nes_state::video_start()
{
m_last_frame_flip = 0;
}
/***************************************************************************
Display refresh
***************************************************************************/
uint32_t nes_state::screen_update_nes(screen_device &screen, bitmap_rgb32 &bitmap, const rectangle &cliprect)
{
// render the ppu
m_ppu->render(bitmap, 0, 0, 0, 0);
// if this is a disk system game, check for the flip-disk key
if ((m_cartslot && m_cartslot->exists() && (m_cartslot->get_pcb_id() == STD_DISKSYS)) // first scenario = disksys in m_cartslot (= famicom)
|| m_disk) // second scenario = disk via fixed internal disk option (fds & famitwin)
{
if (m_io_disksel)
{
// latch this input so it doesn't go at warp speed
if ((m_io_disksel->read() & 0x01) && (!m_last_frame_flip))
{
if (m_disk)
m_disk->disk_flip_side();
else
m_cartslot->disk_flip_side();
m_last_frame_flip = 1;
}
if (!(m_io_disksel->read() & 0x01))
m_last_frame_flip = 0;
}
}
return 0;
}
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