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(MESS) gamecom : added support for dma.decrement_y. Fixes reversed animations in Frogger.

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This commit is contained in:
Robert 2014-11-27 21:46:19 +11:00
parent d5722b3ca2
commit accebcf592
1 changed files with 8 additions and 5 deletions
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13
src/mess/machine/gamecom.c
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@ -435,10 +435,10 @@ WRITE8_MEMBER( gamecom_state::gamecom_handle_dma )
return;
}
if ( m_dma.decrement_x || m_dma.decrement_y )
{
popmessage( "TODO: Decrement-x and decrement-y are not supported yet\n" );
}
//if ( m_dma.decrement_x || m_dma.decrement_y )
//{
//popmessage( "TODO: Decrement-x and decrement-y are not supported yet\n" );
//}
m_dma.width_x = RAM[SM8521_DMDX];
m_dma.width_x_count = 0;
@ -574,7 +574,10 @@ WRITE8_MEMBER( gamecom_state::gamecom_handle_dma )
/* Advance a line */
m_dma.source_x_current = m_dma.source_x;
m_dma.dest_x_current = m_dma.dest_x;
m_dma.source_line += m_dma.source_width;
if ( m_dma.decrement_y )
m_dma.source_line -= m_dma.source_width;
else
m_dma.source_line += m_dma.source_width;
m_dma.source_current = m_dma.source_line;
m_dma.dest_line += m_dma.dest_width;
m_dma.dest_current = m_dma.dest_line;