/***************************************************************************
-= Yun Sung 16 Bit Games =-
driver by Luca Elia (l.elia@tin.it)
[ 2 Scrolling Layers ]
Tiles are 16 x 16 x 8. The layout of the tilemap is a bit weird:
16 consecutive tile codes define a vertical column.
16 columns form a page (256 x 256).
The tilemap is made of 4 x 4 pages (1024 x 1024)
[ 512? Sprites ]
Sprites are 16 x 16 x 4 in size. There's RAM for 512, but
the game just copies 384 entries.
***************************************************************************/
#include "emu.h"
#include "includes/yunsun16.h"
/***************************************************************************
Tilemaps
***************************************************************************/
#define TMAP_GFX (0)
#define TILES_PER_PAGE_X (0x10)
#define TILES_PER_PAGE_Y (0x10)
#define PAGES_PER_TMAP_X (0x4)
#define PAGES_PER_TMAP_Y (0x4)
static TILEMAP_MAPPER( yunsun16_tilemap_scan_pages )
{
return (row / TILES_PER_PAGE_Y) * TILES_PER_PAGE_X * TILES_PER_PAGE_Y * PAGES_PER_TMAP_X +
(row % TILES_PER_PAGE_Y) +
(col / TILES_PER_PAGE_X) * TILES_PER_PAGE_X * TILES_PER_PAGE_Y +
(col % TILES_PER_PAGE_X) * TILES_PER_PAGE_Y;
}
static TILE_GET_INFO( get_tile_info_0 )
{
yunsun16_state *state = machine.driver_data<yunsun16_state>();
UINT16 code = state->m_vram_0[2 * tile_index + 0];
UINT16 attr = state->m_vram_0[2 * tile_index + 1];
SET_TILE_INFO(
TMAP_GFX,
code,
attr & 0xf,
(attr & 0x20) ? TILE_FLIPX : 0);
}
static TILE_GET_INFO( get_tile_info_1 )
{
yunsun16_state *state = machine.driver_data<yunsun16_state>();
UINT16 code = state->m_vram_1[2 * tile_index + 0];
UINT16 attr = state->m_vram_1[2 * tile_index + 1];
SET_TILE_INFO(
TMAP_GFX,
code,
attr & 0xf,
(attr & 0x20) ? TILE_FLIPX : 0);
}
WRITE16_HANDLER( yunsun16_vram_0_w )
{
yunsun16_state *state = space->machine().driver_data<yunsun16_state>();
COMBINE_DATA(&state->m_vram_0[offset]);
tilemap_mark_tile_dirty(state->m_tilemap_0, offset / 2);
}
WRITE16_HANDLER( yunsun16_vram_1_w )
{
yunsun16_state *state = space->machine().driver_data<yunsun16_state>();
COMBINE_DATA(&state->m_vram_1[offset]);
tilemap_mark_tile_dirty(state->m_tilemap_1, offset / 2);
}
/***************************************************************************
Video Hardware Init
***************************************************************************/
VIDEO_START( yunsun16 )
{
yunsun16_state *state = machine.driver_data<yunsun16_state>();
state->m_tilemap_0 = tilemap_create(machine, get_tile_info_0,yunsun16_tilemap_scan_pages,
16,16, TILES_PER_PAGE_X*PAGES_PER_TMAP_X,TILES_PER_PAGE_Y*PAGES_PER_TMAP_Y);
state->m_tilemap_1 = tilemap_create(machine, get_tile_info_1,yunsun16_tilemap_scan_pages,
16,16, TILES_PER_PAGE_X*PAGES_PER_TMAP_X,TILES_PER_PAGE_Y*PAGES_PER_TMAP_Y);
tilemap_set_scrolldx(state->m_tilemap_0, -0x34, 0);
tilemap_set_scrolldx(state->m_tilemap_1, -0x38, 0);
tilemap_set_scrolldy(state->m_tilemap_0, -0x10, 0);
tilemap_set_scrolldy(state->m_tilemap_1, -0x10, 0);
tilemap_set_transparent_pen(state->m_tilemap_0, 0xff);
tilemap_set_transparent_pen(state->m_tilemap_1, 0xff);
}
/***************************************************************************
Sprites Drawing
0.w X
2.w Y
4.w Code
6.w fedc ba98 7--- ----
---- ---- -6-- ---- Flip Y
---- ---- --5- ---- Flip X
---- ---- ---4 3210 Color
***************************************************************************/
static void draw_sprites( running_machine &machine, bitmap_t *bitmap, const rectangle *cliprect )
{
yunsun16_state *state = machine.driver_data<yunsun16_state>();
int offs;
const rectangle &visarea = machine.primary_screen->visible_area();
int max_x = visarea.max_x + 1;
int max_y = visarea.max_y + 1;
int pri = *state->m_priorityram & 3;
int pri_mask;
switch (pri)
{
case 1:
pri_mask = (1 << 1) | (1 << 2) | (1 << 3);
break;
case 2:
pri_mask = (1 << 2) | (1 << 3);
break;
case 3:
default:
pri_mask = 0;
break;
}
for (offs = (state->m_spriteram_size - 8) / 2 ; offs >= 0; offs -= 8 / 2)
{
int x = state->m_spriteram[offs + 0];
int y = state->m_spriteram[offs + 1];
int code = state->m_spriteram[offs + 2];
int attr = state->m_spriteram[offs + 3];
int flipx = attr & 0x20;
int flipy = attr & 0x40;
x += state->m_sprites_scrolldx;
y += state->m_sprites_scrolldy;
if (flip_screen_get(machine)) // not used?
{
flipx = !flipx; x = max_x - x - 16;
flipy = !flipy; y = max_y - y - 16;
}
pdrawgfx_transpen(bitmap,cliprect,machine.gfx[1],
code,
attr & 0x1f,
flipx, flipy,
x,y,
machine.priority_bitmap,
pri_mask,15);
}
}
/***************************************************************************
Screen Drawing
***************************************************************************/
SCREEN_UPDATE( yunsun16 )
{
yunsun16_state *state = screen->machine().driver_data<yunsun16_state>();
tilemap_set_scrollx(state->m_tilemap_0, 0, state->m_scrollram_0[0]);
tilemap_set_scrolly(state->m_tilemap_0, 0, state->m_scrollram_0[1]);
tilemap_set_scrollx(state->m_tilemap_1, 0, state->m_scrollram_1[0]);
tilemap_set_scrolly(state->m_tilemap_1, 0, state->m_scrollram_1[1]);
//popmessage("%04X", *state->m_priorityram);
bitmap_fill(screen->machine().priority_bitmap, cliprect, 0);
if ((*state->m_priorityram & 0x0c) == 4)
{
/* The color of the this layer's transparent pen goes below everything */
tilemap_draw(bitmap, cliprect, state->m_tilemap_0, TILEMAP_DRAW_OPAQUE, 0);
tilemap_draw(bitmap, cliprect, state->m_tilemap_0, 0, 1);
tilemap_draw(bitmap, cliprect, state->m_tilemap_1, 0, 2);
}
else if ((*state->m_priorityram & 0x0c) == 8)
{
/* The color of the this layer's transparent pen goes below everything */
tilemap_draw(bitmap, cliprect, state->m_tilemap_1, TILEMAP_DRAW_OPAQUE, 0);
tilemap_draw(bitmap, cliprect, state->m_tilemap_1, 0, 1);
tilemap_draw(bitmap, cliprect, state->m_tilemap_0, 0, 2);
}
draw_sprites(screen->machine(), bitmap, cliprect);
return 0;
}