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not worth mention: snes.c: improved sprite overlap, simplified oam address handling, fixed sprite blend exception

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This commit is contained in:
Fabio Priuli 2010-03-16 08:19:23 +00:00
parent f86082b904
commit 9643ea2a44
2 changed files with 28 additions and 32 deletions
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16
src/mame/machine/snes.c
View File

@ -461,8 +461,7 @@ READ8_HANDLER( snes_r_io )
if (snes_ram[OAMDATA] == 0)
{
snes_ppu.oam.address++;
snes_ppu.oam.address_low = snes_ram[OAMADDL] = snes_ppu.oam.address & 0xff;
snes_ppu.oam.address_high = snes_ram[OAMADDH] = (snes_ppu.oam.address >> 8) & 0x1;
snes_ppu.oam.address &= 0x1ff;
snes_ppu.oam.first_sprite = snes_ppu.oam.priority_rotation ? (snes_ppu.oam.address >> 1) & 127 : 0;
}
return snes_ppu.ppu1_open_bus;
@ -687,11 +686,7 @@ READ8_HANDLER( snes_r_io )
#ifndef MESS
case 0x4100: /* NSS Dip-Switches */
#ifdef MAME_DEBUG
return input_port_read_safe(space->machine, "DEBUG1", 0);
#else
return input_port_read(space->machine, "DSW");
#endif /* MAME_DEBUG */
// case 0x4101: //PC: a104 - a10e - a12a //only nss_actr
// case 0x420c: //PC: 9c7d - 8fab //only nss_ssoc
@ -818,16 +813,14 @@ WRITE8_HANDLER( snes_w_io )
break;
}
case OAMADDL: /* Address for accessing OAM (low) */
snes_ppu.oam.address_low = data;
snes_ppu.oam.saved_address_low = data;
snes_ppu.oam.address = ((snes_ppu.oam.address_high & 0x1) << 8) + data;
snes_ppu.oam.address = (snes_ppu.oam.address & 0xff00) + data;
snes_ppu.oam.first_sprite = snes_ppu.oam.priority_rotation ? (snes_ppu.oam.address >> 1) & 127 : 0;
snes_ram[OAMDATA] = 0;
break;
case OAMADDH: /* Address for accessing OAM (high) */
snes_ppu.oam.address_high = data & 0x1;
snes_ppu.oam.saved_address_high = data;
snes_ppu.oam.address = ((data & 0x1) << 8) + snes_ppu.oam.address_low;
snes_ppu.oam.address = (snes_ppu.oam.address & 0x00ff) | ((data & 0x01) << 8);
snes_ppu.oam.priority_rotation = BIT(data, 7);
snes_ppu.oam.first_sprite = snes_ppu.oam.priority_rotation ? (snes_ppu.oam.address >> 1) & 127 : 0;
snes_ram[OAMDATA] = 0;
@ -867,8 +860,7 @@ WRITE8_HANDLER( snes_w_io )
{
snes_ram[OAMDATA] = 0;
snes_ppu.oam.address++;
snes_ppu.oam.address_low = snes_ram[OAMADDL] = snes_ppu.oam.address & 0xff;
snes_ppu.oam.address_high = snes_ram[OAMADDH] = (snes_ppu.oam.address >> 8) & 0x1;
snes_ppu.oam.address &= 0x1ff;
snes_ppu.oam.first_sprite = snes_ppu.oam.priority_rotation ? (snes_ppu.oam.address >> 1) & 127 : 0;
}
return;

42
src/mame/video/snes.c
View File

@ -514,10 +514,11 @@ INLINE void snes_draw_tile_x2( UINT8 planes, UINT8 layer, UINT16 tileaddr, INT16
* that it takes a blend parameter.
*****************************************/
INLINE void snes_draw_tile_object( UINT16 tileaddr, INT16 x, UINT8 priority, UINT8 flip, UINT16 pal, UINT8 blend )
INLINE void snes_draw_tile_object( UINT16 tileaddr, INT16 x, UINT8 priority, UINT8 flip, UINT16 pal )
{
UINT8 mask, plane[4];
UINT16 c;
int blend;
INT16 ii, jj;
plane[0] = snes_vram[tileaddr];
@ -548,9 +549,11 @@ INLINE void snes_draw_tile_object( UINT16 tileaddr, INT16 x, UINT8 priority, UIN
mask >>= 1;
}
if (ii >= 0 && ii < SNES_SCR_WIDTH && scanlines[SNES_MAINSCREEN].enable)
INT16 pos = ii & 0x1ff;
if (pos >= 0 && pos < SNES_SCR_WIDTH && scanlines[SNES_MAINSCREEN].enable)
{
if (scanlines[SNES_MAINSCREEN].priority[ii] <= priority)
if (scanlines[SNES_MAINSCREEN].priority[pos] <= priority)
{
UINT8 clr = colour;
@ -559,24 +562,25 @@ INLINE void snes_draw_tile_object( UINT16 tileaddr, INT16 x, UINT8 priority, UIN
#endif /* SNES_LAYER_DEBUG */
/* Clip to windows */
if (scanlines[SNES_MAINSCREEN].clip)
clr &= snes_ppu.clipmasks[SNES_OAM][ii];
clr &= snes_ppu.clipmasks[SNES_OAM][pos];
/* Only draw if we have a colour (0 == transparent) */
if (clr)
{
c = snes_cgram[(pal + clr) % FIXED_COLOUR];
blend = (pal + clr < 192) ? 1 : 0;
scanlines[SNES_MAINSCREEN].buffer[ii] = c;
scanlines[SNES_MAINSCREEN].priority[ii] = priority;
scanlines[SNES_MAINSCREEN].layer[ii] = SNES_OAM;
scanlines[SNES_MAINSCREEN].blend_exception[ii] = blend;
scanlines[SNES_MAINSCREEN].buffer[pos] = c;
scanlines[SNES_MAINSCREEN].priority[pos] = priority;
scanlines[SNES_MAINSCREEN].layer[pos] = SNES_OAM;
scanlines[SNES_MAINSCREEN].blend_exception[pos] = blend;
}
}
}
if (ii >= 0 && ii < SNES_SCR_WIDTH && scanlines[SNES_SUBSCREEN].enable)
if (pos >= 0 && pos < SNES_SCR_WIDTH && scanlines[SNES_SUBSCREEN].enable)
{
if (scanlines[SNES_SUBSCREEN].priority[ii] <= priority)
if (scanlines[SNES_SUBSCREEN].priority[pos] <= priority)
{
UINT8 clr = colour;
@ -585,17 +589,18 @@ INLINE void snes_draw_tile_object( UINT16 tileaddr, INT16 x, UINT8 priority, UIN
#endif /* SNES_LAYER_DEBUG */
/* Clip to windows */
if (scanlines[SNES_SUBSCREEN].clip)
clr &= snes_ppu.clipmasks[SNES_OAM][ii];
clr &= snes_ppu.clipmasks[SNES_OAM][pos];
/* Only draw if we have a colour (0 == transparent) */
if (clr)
{
c = snes_cgram[(pal + clr) % FIXED_COLOUR];
blend = (pal + clr < 192) ? 1 : 0;
scanlines[SNES_SUBSCREEN].buffer[ii] = c;
scanlines[SNES_SUBSCREEN].priority[ii] = priority;
scanlines[SNES_SUBSCREEN].layer[ii] = SNES_OAM;
scanlines[SNES_SUBSCREEN].blend_exception[ii] = blend;
scanlines[SNES_SUBSCREEN].buffer[pos] = c;
scanlines[SNES_SUBSCREEN].priority[pos] = priority;
scanlines[SNES_SUBSCREEN].layer[pos] = SNES_OAM;
scanlines[SNES_SUBSCREEN].blend_exception[pos] = blend;
}
}
}
@ -1226,7 +1231,7 @@ static void snes_update_objects_rto( UINT16 curline )
static void snes_update_objects( UINT8 priority_tbl )
{
UINT8 blend, priority;
UINT8 priority;
UINT32 charaddr;
int i;
static const UINT8 table_obj_priority[10][4] = {
@ -1263,9 +1268,8 @@ static void snes_update_objects( UINT8 priority_tbl )
if (oam_tilelist[i].tileaddr == 0xffff)
continue;
blend = (oam_tilelist[i].pal < 192) ? 1 : 0;
priority = table_obj_priority[priority_tbl][oam_tilelist[i].priority];
snes_draw_tile_object(charaddr + oam_tilelist[i].tileaddr, oam_tilelist[i].x, priority, oam_tilelist[i].hflip, oam_tilelist[i].pal, blend);
snes_draw_tile_object(charaddr + oam_tilelist[i].tileaddr, oam_tilelist[i].x, priority, oam_tilelist[i].hflip, oam_tilelist[i].pal);
}
}
@ -1356,8 +1360,8 @@ static void snes_update_mode_5( UINT16 curline )
return;
#endif /* SNES_LAYER_DEBUG */
snes_update_line(SNES_COLOR_DEPTH_4BPP, 1, 2, 6, SNES_BG1, curline, SNES_OPT_NONE, 0);
snes_update_line(SNES_COLOR_DEPTH_2BPP, 1, 0, 4, SNES_BG2, curline, SNES_OPT_NONE, 0);
snes_update_line(SNES_COLOR_DEPTH_4BPP, 1, 2, 6, SNES_BG1, curline, SNES_OPT_NONE, 0);
snes_update_objects(5);
}