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// license:BSD-3-Clause
// copyright-holders:David Haywood
#include "emu.h"
#include "includes/news.h"
/***************************************************************************
Callbacks for the TileMap code
***************************************************************************/
TILE_GET_INFO_MEMBER(news_state::get_fg_tile_info)
{
int code = (m_fgram[tile_index * 2] << 8) | m_fgram[tile_index * 2 + 1];
tileinfo.set(0,
code & 0x0fff,
(code & 0xf000) >> 12,
0);
}
TILE_GET_INFO_MEMBER(news_state::get_bg_tile_info)
{
int code = (m_bgram[tile_index * 2] << 8) | m_bgram[tile_index * 2 + 1];
int color = (code & 0xf000) >> 12;
code &= 0x0fff;
if ((code & 0x0e00) == 0x0e00)
code = (code & 0x1ff) | (m_bgpic << 9);
tileinfo.set(0,
code,
color,
0);
}
/***************************************************************************
Start the video hardware emulation.
***************************************************************************/
void news_state::video_start()
{
m_fg_tilemap = &machine().tilemap().create(*m_gfxdecode, tilemap_get_info_delegate(*this, FUNC(news_state::get_fg_tile_info)), TILEMAP_SCAN_ROWS, 8, 8, 32, 32);
m_fg_tilemap->set_transparent_pen(0);
m_bg_tilemap = &machine().tilemap().create(*m_gfxdecode, tilemap_get_info_delegate(*this, FUNC(news_state::get_bg_tile_info)), TILEMAP_SCAN_ROWS, 8, 8, 32, 32);
}
/***************************************************************************
Memory handlers
***************************************************************************/
void news_state::news_fgram_w(offs_t offset, uint8_t data)
{
m_fgram[offset] = data;
m_fg_tilemap->mark_tile_dirty(offset / 2);
}
void news_state::news_bgram_w(offs_t offset, uint8_t data)
{
m_bgram[offset] = data;
m_bg_tilemap->mark_tile_dirty(offset / 2);
}
void news_state::news_bgpic_w(uint8_t data)
{
if (m_bgpic != data)
{
m_bgpic = data;
m_bg_tilemap->mark_all_dirty();
}
}
/***************************************************************************
Display refresh
***************************************************************************/
uint32_t news_state::screen_update_news(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
{
m_bg_tilemap->draw(screen, bitmap, cliprect, 0, 0);
m_fg_tilemap->draw(screen, bitmap, cliprect, 0, 0);
return 0;
}
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