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improved x/y

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This commit is contained in:
Michaël Banaan Ananas 2010-05-29 13:25:38 +00:00
parent 1b0d0bf339
commit 5aa040773b
1 changed files with 19 additions and 4 deletions
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23
src/mame/video/prehisle.c
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@ -110,6 +110,19 @@ VIDEO_START( prehisle )
state_save_register_global(machine, invert_controls);
}
/* sprite layout
o fedcba9876543210
0 .......xxxxxxxxx y, other bits unused?
1 .......xxxxxxxxx x, other bits unused?
2 ...xxxxxxxxxxxxx code
2 ..x............. ?
2 .x.............. flipx
2 x............... flipy
3 xxxx............ color+priority, other bits unknown
*/
static void draw_sprites(running_machine *machine, bitmap_t *bitmap, const rectangle *cliprect, int foreground )
{
UINT16 *spriteram16 = machine->generic.spriteram.u16;
@ -120,13 +133,15 @@ static void draw_sprites(running_machine *machine, bitmap_t *bitmap, const recta
int attr = spriteram16[offs + 2];
int code = attr & 0x1fff;
int color = spriteram16[offs + 3] >> 12;
int priority = (color < 0x4);
int priority = (color < 0x4); // correct?
int flipx = attr & 0x4000;
int flipy = attr & 0x8000;
int sx = spriteram16[offs + 1];
int sy = spriteram16[offs];
int sx = spriteram16[offs + 1]&0x1ff;
int sy = spriteram16[offs]&0x1ff;
if (sx & 0x200) sx = -(0xff - (sx & 0xff)); // wraparound
// coordinates are 9-bit signed
if (sx&0x100) sx=-0x100+(sx&0xff);
if (sy&0x100) sy=-0x100+(sy&0xff);
if (flip_screen_get(machine))
{