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irem m92 - this should do the trick!

This commit is contained in:
dinkc64 2014-08-31 06:18:10 +00:00
parent da96be41fc
commit 52f67f1629
1 changed files with 11 additions and 1 deletions
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12
src/burn/drv/irem/d_m92.cpp
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@ -1319,6 +1319,14 @@ UINT8 __fastcall m92ReadPort(UINT32 port)
return 0;
}
static void clear_pf_scroll(INT32 layer)
{
pf_control[layer][0] = 0; // scrolly
pf_control[layer][1] = 0; // "
pf_control[layer][4] = 0; // scrollx
pf_control[layer][5] = 0; // "
}
static void set_pf_info(INT32 layer, INT32 data)
{
struct _m92_layer *ptr = m92_layers[layer];
@ -1327,11 +1335,13 @@ static void set_pf_info(INT32 layer, INT32 data)
ptr->enable = 0;
} else {
ptr->enable = 1;
memset(pf_control[layer], 0, 8); // clear pf_control on enable, fixes skewed background problems (f. ex. inthunt)
ptr->wide = (data & 0x04) ? 128 : 64;
}
int oldrowscroll = ptr->enable_rowscroll;
ptr->enable_rowscroll = data & 0x40;
if (ptr->enable_rowscroll != oldrowscroll)
clear_pf_scroll(layer); //clear scrollx/scrolly on change, fixes skewed background problems (f. ex. inthunt)
ptr->vram = (UINT16*)(DrvVidRAM + ((data & 0x03) * 0x4000));
}