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// license:BSD-3-Clause
// copyright-holders:Nicola Salmoria
#include "emu.h"
#include "includes/mjkjidai.h"
/***************************************************************************
Callbacks for the TileMap code
***************************************************************************/
TILE_GET_INFO_MEMBER(mjkjidai_state::get_tile_info)
{
int attr = m_videoram[tile_index + 0x800];
int code = m_videoram[tile_index] + ((attr & 0x1f) << 8);
int color = m_videoram[tile_index + 0x1000];
SET_TILE_INFO_MEMBER(0,code,color >> 3,0);
}
/***************************************************************************
Start the video hardware emulation.
***************************************************************************/
void mjkjidai_state::video_start()
{
m_bg_tilemap = &machine().tilemap().create(*m_gfxdecode, tilemap_get_info_delegate(*this, FUNC(mjkjidai_state::get_tile_info)),TILEMAP_SCAN_ROWS,8,8,64,32);
}
/***************************************************************************
Memory handlers
***************************************************************************/
WRITE8_MEMBER(mjkjidai_state::mjkjidai_videoram_w)
{
m_videoram[offset] = data;
m_bg_tilemap->mark_tile_dirty(offset & 0x7ff);
}
WRITE8_MEMBER(mjkjidai_state::mjkjidai_ctrl_w)
{
// logerror("%s: port c0 = %02x\n",m_maincpu->pc(),data);
/* bit 0 = NMI enable */
m_nmi_enable = data & 1;
if (!m_nmi_enable)
m_maincpu->set_input_line(INPUT_LINE_NMI, CLEAR_LINE);
/* bit 1 = flip screen */
flip_screen_set(data & 0x02);
/* bit 2 =display enable */
m_display_enable = data & 0x04;
/* bit 5 = coin counter */
machine().bookkeeping().coin_counter_w(0,data & 0x20);
/* bits 6-7 select ROM bank */
membank("bank1")->set_entry(data >> 6);
}
/***************************************************************************
Display refresh
***************************************************************************/
void mjkjidai_state::draw_sprites(bitmap_ind16 &bitmap,const rectangle &cliprect)
{
uint8_t *spriteram = &m_videoram[0];
uint8_t *spriteram_2 = &m_videoram[0x800];
uint8_t *spriteram_3 = &m_videoram[0x1000];
int offs;
for (offs = 0x20-2;offs >= 0;offs -= 2)
{
int code = spriteram[offs] + ((spriteram_2[offs] & 0x1f) << 8);
int color = (spriteram_3[offs] & 0x78) >> 3;
int sx = 2*spriteram_2[offs+1];
int sy = 240 - spriteram[offs+1];
int flipx = code & 1;
int flipy = code & 2;
code >>= 2;
sx += (spriteram_2[offs] & 0x20) >> 5; // not sure about this
if (flip_screen())
{
sx = 496 - sx;
sy = 240 - sy;
flipx = !flipx;
flipy = !flipy;
}
sx += 16;
sy += 1;
m_gfxdecode->gfx(1)->transpen(bitmap,cliprect,
code,
color,
flipx,flipy,
sx,sy,0);
}
}
uint32_t mjkjidai_state::screen_update_mjkjidai(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
{
if (!m_display_enable)
bitmap.fill(m_palette->black_pen(), cliprect);
else
{
m_bg_tilemap->draw(screen, bitmap, cliprect, 0,0);
draw_sprites(bitmap,cliprect);
}
return 0;
}
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