/**
* @file video/djboy.c
*
* video hardware for DJ Boy
*/
#include "emu.h"
#include "video/kan_pand.h"
#include "includes/djboy.h"
WRITE8_HANDLER( djboy_scrollx_w )
{
djboy_state *state = space->machine().driver_data<djboy_state>();
state->m_scrollx = data;
}
WRITE8_HANDLER( djboy_scrolly_w )
{
djboy_state *state = space->machine().driver_data<djboy_state>();
state->m_scrolly = data;
}
static TILE_GET_INFO( get_bg_tile_info )
{
djboy_state *state = machine.driver_data<djboy_state>();
UINT8 attr = state->m_videoram[tile_index + 0x800];
int code = state->m_videoram[tile_index] + (attr & 0xf) * 256;
int color = attr >> 4;
if (color & 8)
code |= 0x1000;
SET_TILE_INFO(1, code, color, 0); /* no flip */
}
WRITE8_HANDLER( djboy_videoram_w )
{
djboy_state *state = space->machine().driver_data<djboy_state>();
state->m_videoram[offset] = data;
tilemap_mark_tile_dirty(state->m_background, offset & 0x7ff);
}
VIDEO_START( djboy )
{
djboy_state *state = machine.driver_data<djboy_state>();
state->m_background = tilemap_create(machine, get_bg_tile_info, tilemap_scan_rows, 16, 16, 64, 32);
}
WRITE8_HANDLER( djboy_paletteram_w )
{
djboy_state *state = space->machine().driver_data<djboy_state>();
int val;
state->m_paletteram[offset] = data;
offset &= ~1;
val = (state->m_paletteram[offset] << 8) | state->m_paletteram[offset + 1];
palette_set_color_rgb(space->machine(), offset / 2, pal4bit(val >> 8), pal4bit(val >> 4), pal4bit(val >> 0));
}
SCREEN_UPDATE( djboy )
{
/**
* xx------ msb x
* --x----- msb y
* ---x---- flipscreen?
* ----xxxx ROM bank
*/
djboy_state *state = screen->machine().driver_data<djboy_state>();
int scroll;
scroll = state->m_scrollx | ((state->m_videoreg & 0xc0) << 2);
tilemap_set_scrollx(state->m_background, 0, scroll - 0x391);
scroll = state->m_scrolly | ((state->m_videoreg & 0x20) << 3);
tilemap_set_scrolly(state->m_background, 0, scroll);
tilemap_draw(bitmap, cliprect, state->m_background, 0, 0);
pandora_update(state->m_pandora, bitmap, cliprect);
return 0;
}
SCREEN_EOF( djboy )
{
djboy_state *state = machine.driver_data<djboy_state>();
pandora_eof(state->m_pandora);
}