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small fix for MESS

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This commit is contained in:
Michaël Banaan Ananas 2011-08-29 12:17:31 +00:00
parent 1e74fafa55
commit 1e612ed0c8
1 changed files with 13 additions and 9 deletions
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22
src/emu/video/tms9928a.c
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@ -469,11 +469,15 @@ void tms9928a_device::device_timer(emu_timer &timer, device_timer_id id, int par
UINT8 sprite_height = sprite_size * ( sprite_mag + 1 );
UINT8 spr_drawn[32+256+32] = { 0 };
UINT8 num_sprites = 0;
bool fifth_encountered = false;
for ( UINT16 sprattr = 0; sprattr < 128; sprattr += 4 )
{
int spr_y = m_vMem[ m_spriteattribute + sprattr + 0 ];
if (!fifth_encountered)
m_FifthSprite = sprattr / 4;
/* Stop processing sprites */
if ( spr_y == 208 )
break;
@ -496,15 +500,7 @@ void tms9928a_device::device_timer(emu_timer &timer, device_timer_id id, int par
/* Fifth sprite encountered? */
if( num_sprites == 5 )
{
m_FifthSprite = sprattr / 4;
if (~m_StatusReg & 0x40)
{
m_StatusReg |= m_FifthSprite;
if (~m_StatusReg & 0x80) m_StatusReg |= 0x40;
}
}
fifth_encountered = true;
if ( sprite_mag )
pataddr += ( ( ( y - spr_y ) & 0x1F ) >> 1 );
@ -552,6 +548,14 @@ void tms9928a_device::device_timer(emu_timer &timer, device_timer_id id, int par
}
}
}
/* Update sprite overflow bits */
if (~m_StatusReg & 0x40)
{
m_StatusReg |= m_FifthSprite;
if (fifth_encountered && ~m_StatusReg & 0x80)
m_StatusReg |= 0x40;
}
}
/* Right border */