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// license:BSD-3-Clause
// copyright-holders:Nicola Salmoria, Ernesto Corvi
#include "emu.h"
#include "includes/iqblock.h"
/***************************************************************************
Callbacks for the TileMap code
***************************************************************************/
TILE_GET_INFO_MEMBER(iqblock_state::get_bg_tile_info)
{
int code = m_bgvideoram[tile_index] + (m_bgvideoram[tile_index + 0x800] << 8);
tileinfo.set(0,
code &(m_video_type ? 0x1fff : 0x3fff),
m_video_type? (2*(code >> 13)+1) : (4*(code >> 14)+3),
0);
}
TILE_GET_INFO_MEMBER(iqblock_state::get_fg_tile_info)
{
int code = m_fgvideoram[tile_index];
tileinfo.set(1,
code & 0x7f,
(code & 0x80) ? 3 : 0,
0);
}
/***************************************************************************
Start the video hardware emulation.
***************************************************************************/
void iqblock_state::video_start()
{
m_bg_tilemap = &machine().tilemap().create(*m_gfxdecode, tilemap_get_info_delegate(*this, FUNC(iqblock_state::get_bg_tile_info)), TILEMAP_SCAN_ROWS, 8, 8,64,32);
m_fg_tilemap = &machine().tilemap().create(*m_gfxdecode, tilemap_get_info_delegate(*this, FUNC(iqblock_state::get_fg_tile_info)), TILEMAP_SCAN_ROWS, 8,32,64, 8);
m_bg_tilemap->set_transparent_pen(0);
m_fg_tilemap->set_scroll_cols(64);
save_item(NAME(m_videoenable));
}
/***************************************************************************
Memory handlers
***************************************************************************/
void iqblock_state::fgvideoram_w(offs_t offset, uint8_t data)
{
m_fgvideoram[offset] = data;
m_fg_tilemap->mark_tile_dirty(offset);
}
void iqblock_state::bgvideoram_w(offs_t offset, uint8_t data)
{
m_bgvideoram[offset] = data;
m_bg_tilemap->mark_tile_dirty(offset & 0x7ff);
}
void iqblock_state::fgscroll_w(offs_t offset, uint8_t data)
{
m_fg_tilemap->set_scrolly(offset,data);
}
/***************************************************************************
Display refresh
***************************************************************************/
uint32_t iqblock_state::screen_update(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
{
if (!m_videoenable) return 0;
m_fg_tilemap->draw(screen, bitmap, cliprect, 0,0);
m_bg_tilemap->draw(screen, bitmap, cliprect, 0,0);
return 0;
}
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