/***************************************************************************
video.c
Functions to emulate the video hardware of the machine.
***************************************************************************/
#include "driver.h"
#include "includes/espial.h"
UINT8 *marineb_videoram;
UINT8 *marineb_colorram;
UINT8 marineb_active_low_flipscreen;
static UINT8 column_scroll;
static UINT8 palette_bank;
static UINT8 flipscreen_x;
static UINT8 flipscreen_y;
static tilemap *bg_tilemap;
/***************************************************************************
Callbacks for the TileMap code
***************************************************************************/
static TILE_GET_INFO( get_tile_info )
{
UINT8 code = marineb_videoram[tile_index];
UINT8 col = marineb_colorram[tile_index];
SET_TILE_INFO(0,
code | ((col & 0xc0) << 2),
(col & 0x0f) | (palette_bank << 4),
TILE_FLIPXY((col >> 4) & 0x03));
}
/*************************************
*
* Video system start
*
*************************************/
VIDEO_START( marineb )
{
bg_tilemap = tilemap_create(get_tile_info,tilemap_scan_rows,TILEMAP_TYPE_PEN,8,8,32,32);
tilemap_set_scroll_cols(bg_tilemap, 32);
}
/*************************************
*
* Memory handlers
*
*************************************/
WRITE8_HANDLER( marineb_videoram_w )
{
marineb_videoram[offset] = data;
tilemap_mark_tile_dirty(bg_tilemap, offset);
}
WRITE8_HANDLER( marineb_colorram_w )
{
marineb_colorram[offset] = data;
tilemap_mark_tile_dirty(bg_tilemap, offset);
}
WRITE8_HANDLER( marineb_column_scroll_w )
{
column_scroll = data;
}
WRITE8_HANDLER( marineb_palette_bank_0_w )
{
UINT8 old = palette_bank;
palette_bank = (palette_bank & 0x02) | ((data & 0x01) << 0);
if (old != palette_bank)
{
tilemap_mark_all_tiles_dirty(bg_tilemap);
}
}
WRITE8_HANDLER( marineb_palette_bank_1_w )
{
UINT8 old = palette_bank;
palette_bank = (palette_bank & 0x01) | ((data & 0x01) << 1);
if (old != palette_bank)
{
tilemap_mark_all_tiles_dirty(bg_tilemap);
}
}
WRITE8_HANDLER( marineb_flipscreen_x_w )
{
flipscreen_x = data ^ marineb_active_low_flipscreen;
tilemap_set_flip(bg_tilemap, (flipscreen_x ? TILEMAP_FLIPX : 0) | (flipscreen_y ? TILEMAP_FLIPY : 0));
}
WRITE8_HANDLER( marineb_flipscreen_y_w )
{
flipscreen_y = data ^ marineb_active_low_flipscreen;
tilemap_set_flip(bg_tilemap, (flipscreen_x ? TILEMAP_FLIPX : 0) | (flipscreen_y ? TILEMAP_FLIPY : 0));
}
/*************************************
*
* Video update
*
*************************************/
static void set_tilemap_scrolly(int cols)
{
int col;
for (col = 0; col < cols; col++)
tilemap_set_scrolly(bg_tilemap, col, column_scroll);
for (; col < 32; col++)
tilemap_set_scrolly(bg_tilemap, col, 0);
}
VIDEO_UPDATE( marineb )
{
int offs;
set_tilemap_scrolly(24);
tilemap_draw(bitmap, cliprect, bg_tilemap, 0, 0);
/* draw the sprites */
for (offs = 0x0f; offs >= 0; offs--)
{
int gfx,sx,sy,code,col,flipx,flipy,offs2;
if ((offs == 0) || (offs == 2)) continue; /* no sprites here */
if (offs < 8)
{
offs2 = 0x0018 + offs;
}
else
{
offs2 = 0x03d8 - 8 + offs;
}
code = marineb_videoram[offs2];
sx = marineb_videoram[offs2 + 0x20];
sy = marineb_colorram[offs2];
col = (marineb_colorram[offs2 + 0x20] & 0x0f) + 16 * palette_bank;
flipx = code & 0x02;
flipy = !(code & 0x01);
if (offs < 4)
{
/* big sprite */
gfx = 2;
code = (code >> 4) | ((code & 0x0c) << 2);
}
else
{
/* small sprite */
gfx = 1;
code >>= 2;
}
if (!flipscreen_y)
{
sy = 256 - machine->gfx[gfx]->width - sy;
flipy = !flipy;
}
if (flipscreen_x)
{
sx++;
}
drawgfx(bitmap,machine->gfx[gfx],
code,
col,
flipx,flipy,
sx,sy,
cliprect,TRANSPARENCY_PEN,0);
}
return 0;
}
VIDEO_UPDATE( changes )
{
int offs,sx,sy,code,col,flipx,flipy;
set_tilemap_scrolly(26);
tilemap_draw(bitmap, cliprect, bg_tilemap, 0, 0);
/* draw the small sprites */
for (offs = 0x05; offs >= 0; offs--)
{
int offs2;
offs2 = 0x001a + offs;
code = marineb_videoram[offs2];
sx = marineb_videoram[offs2 + 0x20];
sy = marineb_colorram[offs2];
col = (marineb_colorram[offs2 + 0x20] & 0x0f) + 16 * palette_bank;
flipx = code & 0x02;
flipy = !(code & 0x01);
if (!flipscreen_y)
{
sy = 256 - machine->gfx[1]->width - sy;
flipy = !flipy;
}
if (flipscreen_x)
{
sx++;
}
drawgfx(bitmap,machine->gfx[1],
code >> 2,
col,
flipx,flipy,
sx,sy,
cliprect,TRANSPARENCY_PEN,0);
}
/* draw the big sprite */
code = marineb_videoram[0x3df];
sx = marineb_videoram[0x3ff];
sy = marineb_colorram[0x3df];
col = marineb_colorram[0x3ff];
flipx = code & 0x02;
flipy = !(code & 0x01);
if (!flipscreen_y)
{
sy = 256 - machine->gfx[2]->width - sy;
flipy = !flipy;
}
if (flipscreen_x)
{
sx++;
}
code >>= 4;
drawgfx(bitmap,machine->gfx[2],
code,
col,
flipx,flipy,
sx,sy,
cliprect,TRANSPARENCY_PEN,0);
/* draw again for wrap around */
drawgfx(bitmap,machine->gfx[2],
code,
col,
flipx,flipy,
sx-256,sy,
cliprect,TRANSPARENCY_PEN,0);
return 0;
}
VIDEO_UPDATE( springer )
{
int offs;
set_tilemap_scrolly(0);
tilemap_draw(bitmap, cliprect, bg_tilemap, 0, 0);
/* draw the sprites */
for (offs = 0x0f; offs >= 0; offs--)
{
int gfx,sx,sy,code,col,flipx,flipy,offs2;
if ((offs == 0) || (offs == 2)) continue; /* no sprites here */
offs2 = 0x0010 + offs;
code = marineb_videoram[offs2];
sx = 240 - marineb_videoram[offs2 + 0x20];
sy = marineb_colorram[offs2];
col = (marineb_colorram[offs2 + 0x20] & 0x0f) + 16 * palette_bank;
flipx = !(code & 0x02);
flipy = !(code & 0x01);
if (offs < 4)
{
/* big sprite */
sx -= 0x10;
gfx = 2;
code = (code >> 4) | ((code & 0x0c) << 2);
}
else
{
/* small sprite */
gfx = 1;
code >>= 2;
}
if (!flipscreen_y)
{
sy = 256 - machine->gfx[gfx]->width - sy;
flipy = !flipy;
}
if (!flipscreen_x)
{
sx--;
}
drawgfx(bitmap,machine->gfx[gfx],
code,
col,
flipx,flipy,
sx,sy,
cliprect,TRANSPARENCY_PEN,0);
}
return 0;
}
VIDEO_UPDATE( hoccer )
{
int offs;
set_tilemap_scrolly(0);
tilemap_draw(bitmap, cliprect, bg_tilemap, 0, 0);
/* draw the sprites */
for (offs = 0x07; offs >= 0; offs--)
{
int sx,sy,code,col,flipx,flipy,offs2;
offs2 = 0x0018 + offs;
code = spriteram[offs2];
sx = spriteram[offs2 + 0x20];
sy = marineb_colorram[offs2];
col = marineb_colorram[offs2 + 0x20];
flipx = code & 0x02;
flipy = !(code & 0x01);
if (!flipscreen_y)
{
sy = 256 - machine->gfx[1]->width - sy;
flipy = !flipy;
}
if (flipscreen_x)
{
sx = 256 - machine->gfx[1]->width - sx;
flipx = !flipx;
}
drawgfx(bitmap,machine->gfx[1],
code >> 2,
col,
flipx,flipy,
sx,sy,
cliprect,TRANSPARENCY_PEN,0);
}
return 0;
}
VIDEO_UPDATE( hopprobo )
{
int offs;
set_tilemap_scrolly(0);
tilemap_draw(bitmap, cliprect, bg_tilemap, 0, 0);
/* draw the sprites */
for (offs = 0x0f; offs >= 0; offs--)
{
int gfx,sx,sy,code,col,flipx,flipy,offs2;
if ((offs == 0) || (offs == 2)) continue; /* no sprites here */
offs2 = 0x0010 + offs;
code = marineb_videoram[offs2];
sx = marineb_videoram[offs2 + 0x20];
sy = marineb_colorram[offs2];
col = (marineb_colorram[offs2 + 0x20] & 0x0f) + 16 * palette_bank;
flipx = code & 0x02;
flipy = !(code & 0x01);
if (offs < 4)
{
/* big sprite */
gfx = 2;
code = (code >> 4) | ((code & 0x0c) << 2);
}
else
{
/* small sprite */
gfx = 1;
code >>= 2;
}
if (!flipscreen_y)
{
sy = 256 - machine->gfx[gfx]->width - sy;
flipy = !flipy;
}
if (!flipscreen_x)
{
sx--;
}
drawgfx(bitmap,machine->gfx[gfx],
code,
col,
flipx,flipy,
sx,sy,
cliprect,TRANSPARENCY_PEN,0);
}
return 0;
}