/***************************************************************************
Sega System 16B hardware
***************************************************************************/
#include "driver.h"
#include "segaic16.h"
#include "includes/system16.h"
/*************************************
*
* Video startup
*
*************************************/
static void video_start_common(int type)
{
/* compute palette info */
segaic16_palette_init(0x800);
/* initialize the tile/text layers */
segaic16_tilemap_init(0, type, 0x000, 0, 2);
/* initialize the sprites */
segaic16_sprites_init(0, SEGAIC16_SPRITES_16B, 0x400, 0);
}
VIDEO_START( system16b )
{
video_start_common(SEGAIC16_TILEMAP_16B);
}
VIDEO_START( timscanr )
{
video_start_common(SEGAIC16_TILEMAP_16B_ALT);
}
/*************************************
*
* Video update
*
*************************************/
VIDEO_UPDATE( system16b )
{
/* if no drawing is happening, fill with black and get out */
if (!segaic16_display_enable)
{
fillbitmap(bitmap, get_black_pen(machine), cliprect);
return 0;
}
/* reset priorities */
fillbitmap(priority_bitmap, 0, cliprect);
/* draw background opaquely first, not setting any priorities */
segaic16_tilemap_draw(machine, 0, bitmap, cliprect, SEGAIC16_TILEMAP_BACKGROUND, 0 | TILEMAP_DRAW_OPAQUE, 0x00);
segaic16_tilemap_draw(machine, 0, bitmap, cliprect, SEGAIC16_TILEMAP_BACKGROUND, 1 | TILEMAP_DRAW_OPAQUE, 0x00);
/* draw background again, just to set the priorities on non-transparent pixels */
segaic16_tilemap_draw(machine, 0, NULL, cliprect, SEGAIC16_TILEMAP_BACKGROUND, 0, 0x01);
segaic16_tilemap_draw(machine, 0, NULL, cliprect, SEGAIC16_TILEMAP_BACKGROUND, 1, 0x02);
/* draw foreground */
segaic16_tilemap_draw(machine, 0, bitmap, cliprect, SEGAIC16_TILEMAP_FOREGROUND, 0, 0x02);
segaic16_tilemap_draw(machine, 0, bitmap, cliprect, SEGAIC16_TILEMAP_FOREGROUND, 1, 0x04);
/* text layer */
segaic16_tilemap_draw(machine, 0, bitmap, cliprect, SEGAIC16_TILEMAP_TEXT, 0, 0x04);
segaic16_tilemap_draw(machine, 0, bitmap, cliprect, SEGAIC16_TILEMAP_TEXT, 1, 0x08);
/* draw the sprites */
segaic16_sprites_draw(0, bitmap, cliprect);
return 0;
}