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update to prev system1 commit

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This commit is contained in:
Michaël Banaan Ananas 2011-12-17 05:38:53 +00:00
parent 765785f927
commit 0ddf029c71
1 changed files with 20 additions and 14 deletions
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32
src/mame/video/system1.c
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@ -79,8 +79,9 @@
**************************************************************************
TODO:
- sprite vs background alignment is off sometimes, best visible when
scrolling, eg. in regulus, nob, brain
- Sprite vs background alignment is off sometimes, best visible when
scrolling, eg. in regulus, brain. Yet it is correct in other games,
such as wboy.
- not sure if sprite priorities are completely accurate
*************************************************************************/
@ -453,7 +454,7 @@ static void draw_sprites(running_machine &machine, bitmap_t *bitmap, const recta
{
for (i = 0; i < 2; i++)
{
int effx = flipscreen ? 255 - (x + i) : (x + i);
int effx = flipscreen ? 0x1fe - (x + i) : (x + i);
if (effx >= cliprect->min_x && effx <= cliprect->max_x)
{
int prevpix = destbase[effx];
@ -474,7 +475,7 @@ static void draw_sprites(running_machine &machine, bitmap_t *bitmap, const recta
{
for (i = 0; i < 2; i++)
{
int effx = flipscreen ? 255 - (x + 2 + i) : (x + 2 + i);
int effx = flipscreen ? 0x1fe - (x + 2 + i) : (x + 2 + i);
if (effx >= cliprect->min_x && effx <= cliprect->max_x)
{
int prevpix = destbase[effx];
@ -582,14 +583,14 @@ SCREEN_UPDATE( system1 )
fgpixmap = tilemap_get_pixmap(state->m_tilemap_page[1]);
/* get fixed scroll offsets */
xscroll = (videoram[0xffc] | (videoram[0xffd] << 8)) + 28;
xscroll = (INT16)((videoram[0xffc] | (videoram[0xffd] << 8)) + 28);
yscroll = videoram[0xfbd];
/* adjust for flipping */
if (flip_screen_get(screen->machine()))
{
xscroll = 279 - xscroll;
yscroll = 256 - yscroll;
xscroll = 640 - (xscroll & 0x1ff);
yscroll = 764 - (yscroll & 0x1ff);
}
/* fill in the row scroll table */
@ -630,9 +631,9 @@ SCREEN_UPDATE( system2 )
}
else
{
xscroll = 262+256 - ((((videoram[0x7f6] | (videoram[0x7f7] << 8)) / 2) & 0xff) - 256 + 5);
yscroll = 256+256 - videoram[0x784];
sprxoffset = -7;
xscroll = 512 + 512 + 10 - (((videoram[0x7f6] | (videoram[0x7f7] << 8)) & 0x1ff) - 512 + 10);
yscroll = 512 + 512 - videoram[0x784];
sprxoffset = -14;
}
/* fill in the row scroll table */
@ -652,6 +653,7 @@ SCREEN_UPDATE( system2_rowscroll )
bitmap_t *bgpixmaps[4], *fgpixmap;
int rowscroll[32];
int yscroll;
int sprxoffset;
int y;
/* 4 independent background pages */
@ -668,16 +670,20 @@ SCREEN_UPDATE( system2_rowscroll )
{
for (y = 0; y < 32; y++)
rowscroll[y] = ((videoram[0x7c0 + y * 2] | (videoram[0x7c1 + y * 2] << 8)) & 0x1ff) - 512 + 10;
yscroll = videoram[0x7ba];
sprxoffset = 14;
}
else
{
for (y = 0; y < 32; y++)
rowscroll[y] = 262+256 - ((((videoram[0x7fe - y * 2] | (videoram[0x7ff - y * 2] << 8)) / 2) & 0xff) - 256 + 5);
yscroll = 256+256 - videoram[0x784];
rowscroll[y] = 512 + 512 + 10 - (((videoram[0x7fe - y * 2] | (videoram[0x7ff - y * 2] << 8)) & 0x1ff) - 512 + 10);
yscroll = 512 + 512 - videoram[0x784];
sprxoffset = -14;
}
/* common update */
video_update_common(screen, bitmap, cliprect, fgpixmap, bgpixmaps, rowscroll, yscroll, 14);
video_update_common(screen, bitmap, cliprect, fgpixmap, bgpixmaps, rowscroll, yscroll, sprxoffset);
return 0;
}