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/***************************************************************************
Sega System 16B hardware
***************************************************************************/
#include "emu.h"
#include "video/segaic16.h"
#include "includes/segas16.h"
/*************************************
*
* Video startup
*
*************************************/
static void video_start_common(running_machine &machine, int type)
{
/* compute palette info */
segaic16_palette_init(0x800);
/* initialize the tile/text layers */
segaic16_tilemap_init(machine, 0, type, 0x000, 0, 2);
}
VIDEO_START( system16b )
{
video_start_common(machine, SEGAIC16_TILEMAP_16B);
}
VIDEO_START( timscanr )
{
video_start_common(machine, SEGAIC16_TILEMAP_16B_ALT);
}
/*************************************
*
* Video update
*
*************************************/
SCREEN_UPDATE( system16b )
{
/* if no drawing is happening, fill with black and get out */
if (!segaic16_display_enable)
{
bitmap_fill(bitmap, cliprect, get_black_pen(screen->machine()));
return 0;
}
/* reset priorities */
bitmap_fill(screen->machine().priority_bitmap, cliprect, 0);
/* draw background opaquely first, not setting any priorities */
segaic16_tilemap_draw(screen, bitmap, cliprect, 0, SEGAIC16_TILEMAP_BACKGROUND, 0 | TILEMAP_DRAW_OPAQUE, 0x00);
segaic16_tilemap_draw(screen, bitmap, cliprect, 0, SEGAIC16_TILEMAP_BACKGROUND, 1 | TILEMAP_DRAW_OPAQUE, 0x00);
/* draw background again, just to set the priorities on non-transparent pixels */
segaic16_tilemap_draw(screen, NULL, cliprect, 0, SEGAIC16_TILEMAP_BACKGROUND, 0, 0x01);
segaic16_tilemap_draw(screen, NULL, cliprect, 0, SEGAIC16_TILEMAP_BACKGROUND, 1, 0x02);
/* draw foreground */
segaic16_tilemap_draw(screen, bitmap, cliprect, 0, SEGAIC16_TILEMAP_FOREGROUND, 0, 0x02);
segaic16_tilemap_draw(screen, bitmap, cliprect, 0, SEGAIC16_TILEMAP_FOREGROUND, 1, 0x04);
/* text layer */
segaic16_tilemap_draw(screen, bitmap, cliprect, 0, SEGAIC16_TILEMAP_TEXT, 0, 0x04);
segaic16_tilemap_draw(screen, bitmap, cliprect, 0, SEGAIC16_TILEMAP_TEXT, 1, 0x08);
/* draw the sprites */
segaic16_sprites_draw(screen, bitmap, cliprect, 0);
return 0;
}
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