UINT32 segaorun_state::screen_update_shangon(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
{
// start the sprites drawing
m_sprites->draw_async(cliprect);
// reset priorities
machine().priority_bitmap.fill(0, cliprect);
// draw the low priority road layer
segaic16_road_draw(0, bitmap, cliprect, SEGAIC16_ROAD_BACKGROUND);
// draw background
segaic16_tilemap_draw(screen, bitmap, cliprect, 0, SEGAIC16_TILEMAP_BACKGROUND, 0, 0x01);
segaic16_tilemap_draw(screen, bitmap, 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);
// draw the high priority road
segaic16_road_draw(0, bitmap, cliprect, SEGAIC16_ROAD_FOREGROUND);
// text layer
// note that we inflate the priority of the text layer to prevent sprites
// from drawing over the high scores
segaic16_tilemap_draw(screen, bitmap, cliprect, 0, SEGAIC16_TILEMAP_TEXT, 0, 0x08);
segaic16_tilemap_draw(screen, bitmap, cliprect, 0, SEGAIC16_TILEMAP_TEXT, 1, 0x08);
// mix in sprites
bitmap_ind16 &sprites = m_sprites->bitmap();
for (const sparse_dirty_rect *rect = m_sprites->first_dirty_rect(cliprect); rect != NULL; rect = rect->next())
for (int y = rect->min_y; y <= rect->max_y; y++)
{
UINT16 *dest = &bitmap.pix(y);
UINT16 *src = &sprites.pix(y);
UINT8 *pri = &machine().priority_bitmap.pix(y);
for (int x = rect->min_x; x <= rect->max_x; x++)
{
// only process written pixels
UINT16 pix = src[x];
if (pix != 0xffff)
{
// compare sprite priority against tilemap priority
int priority = (pix >> 10) & 3;
if ((1 << priority) > pri[x])
{
// if the color is set to maximum, shadow pixels underneath us
if ((pix & 0x03f0) == 0x03f0)
dest[x] += (m_paletteram[dest[x]] & 0x8000) ? m_palette_entries*2 : m_palette_entries;
// otherwise, just add in sprite palette base
else
dest[x] = 0x400 | (pix & 0x3ff);
}
}
}
}
UINT32 segaxbd_state::screen_update(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
{
// if no drawing is happening, fill with black and get out
if (!segaic16_display_enable)
{
bitmap.fill(get_black_pen(machine()), cliprect);
return 0;
}
// reset priorities
machine().priority_bitmap.fill(0, cliprect);
// draw the low priority road layer
segaic16_road_draw(0, bitmap, cliprect, SEGAIC16_ROAD_BACKGROUND);
if (m_road_priority == 0)
segaic16_road_draw(0, bitmap, cliprect, SEGAIC16_ROAD_FOREGROUND);
// draw background
segaic16_tilemap_draw(screen, bitmap, cliprect, 0, SEGAIC16_TILEMAP_BACKGROUND, 0, 0x01);
segaic16_tilemap_draw(screen, bitmap, 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);
// draw the high priority road
if (m_road_priority == 1)
segaic16_road_draw(0, bitmap, cliprect, SEGAIC16_ROAD_FOREGROUND);
// 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;
}
