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troangel: better support of line scroll with wrap

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the scroll offsets are splitted in LOW byte and HIGH byte
This commit is contained in:
Roberto Zandona 2009-03-14 14:32:57 +00:00
parent 9bbca338d4
commit 14d4b8e72e
1 changed files with 10 additions and 7 deletions
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17
src/mame/video/m57.c
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@ -175,28 +175,31 @@ WRITE8_HANDLER( m57_flipscreen_w )
static void draw_background(running_machine *machine, bitmap_t *bitmap, const rectangle *cliprect)
{
int y,x;
INT16 scrolly;
for (y = 0; y < 128; y++)
tilemap_set_scrollx(bg_tilemap, y, (y < 64) ? 0 : m57_scroll[64]);
for (y = 64; y < 128; y++)
tilemap_set_scrollx(bg_tilemap, y, m57_scroll[0x40]);
tilemap_draw(bitmap, cliprect, bg_tilemap, 0, 0);
for (y = 128; y <= cliprect->max_y; y++)
{
if (m57_scroll[y] < 128)
scrolly = m57_scroll[y] + (m57_scroll[y + 0x100] << 8);
if (scrolly >= 0)
{
for (x = cliprect->min_x; x <= cliprect->max_x; x++)
{
if ((x + m57_scroll[y]) <= cliprect->max_x)
*BITMAP_ADDR16(bitmap, y, x) = *BITMAP_ADDR16(bitmap, y, x + m57_scroll[y]);
if ((x + scrolly) <= cliprect->max_x)
*BITMAP_ADDR16(bitmap, y, x) = *BITMAP_ADDR16(bitmap, y, x + scrolly);
else
*BITMAP_ADDR16(bitmap, y, x) = *BITMAP_ADDR16(bitmap, y, cliprect->max_x);
}
} else {
for (x = cliprect->max_x; x >= cliprect->min_x; x--)
{
if ((x + m57_scroll[y] - 256) >= cliprect->min_x)
*BITMAP_ADDR16(bitmap, y, x) = *BITMAP_ADDR16(bitmap, y, x + m57_scroll[y] - 256);
if ((x + scrolly) >= cliprect->min_x)
*BITMAP_ADDR16(bitmap, y, x) = *BITMAP_ADDR16(bitmap, y, x + scrolly);
else
*BITMAP_ADDR16(bitmap, y, x) = *BITMAP_ADDR16(bitmap, y, cliprect->min_x);
}