/***************************************************************************
Video Hardware for some Technos games:
Double Dragon, Double Dragon bootleg, Double Dragon II and China Gate
Two Tile layers.
Background layer is 512x512 , tiles are 16x16
Top layer is 256x256 , tiles are 8x8
Sprites are 16x16, 16x32, 32x16, or 32x32 (attribute bits set dimension)
BG Tile Layout
0 1
---- -xxx xxxx xxxx = Tile number
--xx x--- ---- ---- = Color
-x-- ---- ---- ---- = X Flip
x--- ---- ---- ---- = Y Flip
Top Tile layout.
0 1
---- xxxx xxxx xxxx = Tile number
xxxx ---- ---- ---- = Color (China Gate)
xxx- ---- ---- ---- = Color (Double Dragon)
Sprite layout.
0 1 2 3 4
---- ---- ---- ---- ---- xxxx xxxx xxxx ---- ---- = Sprite number
---- ---- ---- ---- -xxx ---- ---- ---- ---- ---- = Color
xxxx xxxx ---- ---- ---- ---- ---- ---- ---- ---- = Y position
---- ---- ---- ---x ---- ---- ---- ---- ---- ---- = Y MSb position ???
---- ---- ---- ---- ---- ---- ---- ---- xxxx xxxx = X position
---- ---- ---- --x- ---- ---- ---- ---- ---- ---- = X MSb position ???
---- ---- ---- -x-- ---- ---- ---- ---- ---- ---- = Y Flip
---- ---- ---- x--- ---- ---- ---- ---- ---- ---- = X Flip
---- ---- --xx ---- ---- ---- ---- ---- ---- ---- = Sprite Dimension
---- ---- x--- ---- ---- ---- ---- ---- ---- ---- = Visible
***************************************************************************/
#include "emu.h"
#include "includes/ddragon.h"
/***************************************************************************
Callbacks for the TileMap code
***************************************************************************/
static TILEMAP_MAPPER( background_scan )
{
/* logical (col,row) -> memory offset */
return (col & 0x0f) + ((row & 0x0f) << 4) + ((col & 0x10) << 4) + ((row & 0x10) << 5);
}
static TILE_GET_INFO( get_bg_tile_info )
{
ddragon_state *state = machine.driver_data<ddragon_state>();
UINT8 attr = state->m_bgvideoram[2 * tile_index];
SET_TILE_INFO(
2,
state->m_bgvideoram[2 * tile_index+1] + ((attr & 0x07) << 8),
(attr >> 3) & 0x07,
TILE_FLIPYX((attr & 0xc0) >> 6));
}
static TILE_GET_INFO( get_fg_tile_info )
{
ddragon_state *state = machine.driver_data<ddragon_state>();
UINT8 attr = state->m_fgvideoram[2 * tile_index];
SET_TILE_INFO(
0,
state->m_fgvideoram[2 * tile_index + 1] + ((attr & 0x07) << 8),
attr >> 5,
0);
}
static TILE_GET_INFO( get_fg_16color_tile_info )
{
ddragon_state *state = machine.driver_data<ddragon_state>();
UINT8 attr = state->m_fgvideoram[2 * tile_index];
SET_TILE_INFO(
0,
state->m_fgvideoram[2 * tile_index+1] + ((attr & 0x0f) << 8),
attr >> 4,
0);
}
/***************************************************************************
Start the video hardware emulation.
***************************************************************************/
VIDEO_START( ddragon )
{
ddragon_state *state = machine.driver_data<ddragon_state>();
state->m_bg_tilemap = tilemap_create(machine, get_bg_tile_info, background_scan, 16, 16, 32, 32);
state->m_fg_tilemap = tilemap_create(machine, get_fg_tile_info, tilemap_scan_rows, 8, 8, 32, 32);
tilemap_set_transparent_pen(state->m_fg_tilemap, 0);
tilemap_set_scrolldx(state->m_fg_tilemap, 0, 384 - 256);
tilemap_set_scrolldx(state->m_bg_tilemap, 0, 384 - 256);
tilemap_set_scrolldy(state->m_fg_tilemap, -8, -8);
tilemap_set_scrolldy(state->m_bg_tilemap, -8, -8);
}
VIDEO_START( chinagat )
{
ddragon_state *state = machine.driver_data<ddragon_state>();
state->m_bg_tilemap = tilemap_create(machine, get_bg_tile_info,background_scan, 16, 16, 32, 32);
state->m_fg_tilemap = tilemap_create(machine, get_fg_16color_tile_info,tilemap_scan_rows, 8, 8, 32, 32);
tilemap_set_transparent_pen(state->m_fg_tilemap, 0);
tilemap_set_scrolldy(state->m_fg_tilemap, -8, -8);
tilemap_set_scrolldy(state->m_bg_tilemap, -8, -8);
}
/***************************************************************************
Memory handlers
***************************************************************************/
WRITE8_HANDLER( ddragon_bgvideoram_w )
{
ddragon_state *state = space->machine().driver_data<ddragon_state>();
state->m_bgvideoram[offset] = data;
tilemap_mark_tile_dirty(state->m_bg_tilemap, offset / 2);
}
WRITE8_HANDLER( ddragon_fgvideoram_w )
{
ddragon_state *state = space->machine().driver_data<ddragon_state>();
state->m_fgvideoram[offset] = data;
tilemap_mark_tile_dirty(state->m_fg_tilemap, offset / 2);
}
/***************************************************************************
Display refresh
***************************************************************************/
#define DRAW_SPRITE( order, sx, sy ) drawgfx_transpen( bitmap, \
cliprect,gfx, \
(which + order),color,flipx,flipy,sx,sy,0);
static void draw_sprites( running_machine& machine, bitmap_t *bitmap,const rectangle *cliprect )
{
ddragon_state *state = machine.driver_data<ddragon_state>();
const gfx_element *gfx = machine.gfx[1];
UINT8 *src;
int i;
if (state->m_technos_video_hw == 1) /* China Gate Sprite RAM */
src = (UINT8 *) (state->m_spriteram);
else
src = (UINT8 *) (&(state->m_spriteram[0x800]));
for (i = 0; i < (64 * 5); i += 5)
{
int attr = src[i + 1];
if (attr & 0x80) /* visible */
{
int sx = 240 - src[i + 4] + ((attr & 2) << 7);
int sy = 232 - src[i + 0] + ((attr & 1) << 8);
int size = (attr & 0x30) >> 4;
int flipx = (attr & 8);
int flipy = (attr & 4);
int dx = -16,dy = -16;
int which;
int color;
if (state->m_technos_video_hw == 2) /* Double Dragon 2 */
{
color = (src[i + 2] >> 5);
which = src[i + 3] + ((src[i + 2] & 0x1f) << 8);
}
else
{
if (state->m_technos_video_hw == 1) /* China Gate */
{
if ((sx < -7) && (sx > -16)) sx += 256; /* fix sprite clip */
if ((sy < -7) && (sy > -16)) sy += 256; /* fix sprite clip */
}
color = (src[i + 2] >> 4) & 0x07;
which = src[i + 3] + ((src[i + 2] & 0x0f) << 8);
}
if (flip_screen_get(machine))
{
sx = 240 - sx;
sy = 256 - sy;
flipx = !flipx;
flipy = !flipy;
dx = -dx;
dy = -dy;
}
which &= ~size;
switch (size)
{
case 0: /* normal */
DRAW_SPRITE(0, sx, sy);
break;
case 1: /* double y */
DRAW_SPRITE(0, sx, sy + dy);
DRAW_SPRITE(1, sx, sy);
break;
case 2: /* double x */
DRAW_SPRITE(0, sx + dx, sy);
DRAW_SPRITE(2, sx, sy);
break;
case 3:
DRAW_SPRITE(0, sx + dx, sy + dy);
DRAW_SPRITE(1, sx + dx, sy);
DRAW_SPRITE(2, sx, sy + dy);
DRAW_SPRITE(3, sx, sy);
break;
}
}
}
}
#undef DRAW_SPRITE
SCREEN_UPDATE( ddragon )
{
ddragon_state *state = screen->machine().driver_data<ddragon_state>();
int scrollx = (state->m_scrollx_hi << 8) | *state->m_scrollx_lo;
int scrolly = (state->m_scrolly_hi << 8) | *state->m_scrolly_lo;
tilemap_set_scrollx(state->m_bg_tilemap, 0, scrollx);
tilemap_set_scrolly(state->m_bg_tilemap, 0, scrolly);
tilemap_draw(bitmap,cliprect, state->m_bg_tilemap,0,0);
draw_sprites(screen->machine(), bitmap, cliprect);
tilemap_draw(bitmap, cliprect, state->m_fg_tilemap, 0, 0);
return 0;
}