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#include "emu.h"
#include "includes/iqblock.h"
/***************************************************************************
Callbacks for the TileMap code
***************************************************************************/
static TILE_GET_INFO( get_bg_tile_info )
{
iqblock_state *state = machine.driver_data<iqblock_state>();
int code = state->m_bgvideoram[tile_index] + (state->m_bgvideoram[tile_index + 0x800] << 8);
SET_TILE_INFO(
0,
code &(state->m_video_type ? 0x1fff : 0x3fff),
state->m_video_type? (2*(code >> 13)+1) : (4*(code >> 14)+3),
0);
}
static TILE_GET_INFO( get_fg_tile_info )
{
iqblock_state *state = machine.driver_data<iqblock_state>();
int code = state->m_fgvideoram[tile_index];
SET_TILE_INFO(
1,
code & 0x7f,
(code & 0x80) ? 3 : 0,
0);
}
/***************************************************************************
Start the video hardware emulation.
***************************************************************************/
VIDEO_START( iqblock )
{
iqblock_state *state = machine.driver_data<iqblock_state>();
state->m_bg_tilemap = tilemap_create(machine, get_bg_tile_info,tilemap_scan_rows, 8, 8,64,32);
state->m_fg_tilemap = tilemap_create(machine, get_fg_tile_info,tilemap_scan_rows,8,32,64, 8);
tilemap_set_transparent_pen(state->m_bg_tilemap,0);
tilemap_set_scroll_cols(state->m_fg_tilemap,64);
}
/***************************************************************************
Memory handlers
***************************************************************************/
WRITE8_HANDLER( iqblock_fgvideoram_w )
{
iqblock_state *state = space->machine().driver_data<iqblock_state>();
state->m_fgvideoram[offset] = data;
tilemap_mark_tile_dirty(state->m_fg_tilemap,offset);
}
WRITE8_HANDLER( iqblock_bgvideoram_w )
{
iqblock_state *state = space->machine().driver_data<iqblock_state>();
state->m_bgvideoram[offset] = data;
tilemap_mark_tile_dirty(state->m_bg_tilemap,offset & 0x7ff);
}
READ8_HANDLER( iqblock_bgvideoram_r )
{
iqblock_state *state = space->machine().driver_data<iqblock_state>();
return state->m_bgvideoram[offset];
}
WRITE8_HANDLER( iqblock_fgscroll_w )
{
iqblock_state *state = space->machine().driver_data<iqblock_state>();
tilemap_set_scrolly(state->m_fg_tilemap,offset,data);
}
/***************************************************************************
Display refresh
***************************************************************************/
SCREEN_UPDATE( iqblock )
{
iqblock_state *state = screen->machine().driver_data<iqblock_state>();
if (!state->m_videoenable) return 0;
tilemap_draw(bitmap,cliprect,state->m_fg_tilemap,0,0);
tilemap_draw(bitmap,cliprect,state->m_bg_tilemap,0,0);
return 0;
}
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