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Fixed a priority bug, updated notes

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This commit is contained in:
Angelo Salese 2010-12-16 18:01:27 +00:00
parent 03f6344901
commit 41d74b4493
1 changed files with 10 additions and 15 deletions
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25
src/mame/video/m107.c
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@ -30,7 +30,8 @@
Playfield control:
Bit 0x0f00: Playfield location in VRAM (in steps of 0x1000)
Bit 0x0080: 0 = Playfield enable, 1 = disable
Bit 0x0002: 1 = Rowscroll enable, 0 = disable
Bit 0x0002: 1 = Rowselect enable, 0 = disable
Bit 0x0001: 1 = Rowscroll enable, 0 = disable
*****************************************************************************/
@ -115,7 +116,8 @@ WRITE16_HANDLER( m107_control_w )
if ((old ^ m107_control[offset]) & 0x0f00)
tilemap_mark_all_tiles_dirty(layer->tmap);
printf("%04x %02x\n",m107_control[offset],offset*2);
if(m107_control[offset] & 0xf07c)
printf("%04x %02x\n",m107_control[offset],offset*2);
break;
@ -248,17 +250,10 @@ static void m107_update_scroll_positions(void)
int laynum;
int i;
/* Playfield 4 rowscroll data is 0xde800 - 0xdebff???
Playfield 3 rowscroll data is 0xdf800 - 0xdfbff
Playfield 2 rowscroll data is 0xdf400 - 0xdf7ff
Playfield 1 rowscroll data is 0xde800 - 0xdebff ??
alt rowscrolling is at 0xde000 - 0xde7ff, every layer uses 0x200 bytes out of this, so it should be:
0xde000 - 0xde1ff layer 0
0xde200 - 0xde3ff layer 1
0xde400 - 0xde5ff layer 2
0xde600 - 0xde7ff layer 3
The question is: why it uses 256 values for 512 rows? Is my hook-up correct?
/*
rowscroll is at 0xde000 - 0xde7ff, every layer has dedicated 0x200 bytes inside this area, enabled with bit 0 of the layer video register
rowselect is at 0xde800 - 0xdefff, every layer has dedicated 0x200 bytes inside this area, enabled with bit 1 of the layer video register
Perhaps 0xdf000 - 0xdffff and bit 2-3 are respectively colscroll and colselect?
*/
for (laynum = 0; laynum < 4; laynum++)
@ -335,12 +330,12 @@ static void m107_screenrefresh(running_machine *machine, bitmap_t *bitmap, const
bitmap_fill(bitmap, cliprect, 0);
m107_tilemap_draw(machine, bitmap, cliprect, 2, 0);
m107_tilemap_draw(machine, bitmap, cliprect, 2, 1);
m107_tilemap_draw(machine, bitmap, cliprect, 1, 0);
m107_tilemap_draw(machine, bitmap, cliprect, 0, 0);
draw_sprites(machine, bitmap, cliprect, 0);
m107_tilemap_draw(machine, bitmap, cliprect, 2, 1);
m107_tilemap_draw(machine, bitmap, cliprect, 1, 1);
m107_tilemap_draw(machine, bitmap, cliprect, 0, 1);