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Small refactor - added MemGetPtrBANK1()

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tomch 2013-07-13 21:32:08 +00:00
parent 7d8035bc70
commit f3f89bd383
1 changed files with 21 additions and 14 deletions
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35
AppleWin/source/Memory.cpp
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@ -1062,16 +1062,26 @@ bool MemCheckSLOTCXROM()
//===========================================================================
static LPBYTE MemGetPtrBANK1(const WORD offset, const LPBYTE pMemBase)
{
if ((offset & 0xF000) != 0xC000) // Requesting RAM at physical addr $Cxxx (ie. 4K RAM BANK1)
return NULL;
const BYTE bank1page = (offset >> 8) & 0xF;
return (memshadow[0xD0+bank1page] == pMemBase+(0xC0+bank1page)*256)
? mem+offset+0x1000 // Return ptr to $Dxxx address - 'mem' has (a potentially dirty) 4K RAM BANK1 mapped in at $D000
: pMemBase+offset; // Else return ptr to $Cxxx address
}
//-------------------------------------
LPBYTE MemGetAuxPtr(const WORD offset)
{
if ((offset & 0xF000) == 0xC000) // Requesting RAM at physical addr $C000 (ie. 4K RAM BANK1)
{
const BYTE bank1page = (offset >> 8) & 0xF;
if (memshadow[0xD0+bank1page] == memaux+(0xC0+bank1page)*256) // 'mem' has (a potentially dirty) aux 4K RAM BANK1 mapped in at $D000
return mem+offset+0x1000; // Return ptr to $Dxxx address
}
LPBYTE lpMem = MemGetPtrBANK1(offset, memaux);
if (lpMem)
return lpMem;
LPBYTE lpMem = (memshadow[(offset >> 8)] == (memaux+(offset & 0xFF00)))
lpMem = (memshadow[(offset >> 8)] == (memaux+(offset & 0xFF00)))
? mem+offset // Return 'mem' copy if possible, as page could be dirty
: memaux+offset;
@ -1090,16 +1100,13 @@ LPBYTE MemGetAuxPtr(const WORD offset)
return lpMem;
}
//===========================================================================
//-------------------------------------
LPBYTE MemGetMainPtr(const WORD offset)
{
if ((offset & 0xF000) == 0xC000) // Requesting RAM at physical addr $C000 (ie. 4K RAM BANK1)
{
const BYTE bank1page = (offset >> 8) & 0xF;
if (memshadow[0xD0+bank1page] == memmain+(0xC0+bank1page)*256) // 'mem' has (a potentially dirty) main 4K RAM BANK1 mapped in at $D000
return mem+offset+0x1000; // Return ptr to $Dxxx address
}
LPBYTE lpMem = MemGetPtrBANK1(offset, memmain);
if (lpMem)
return lpMem;
return (memshadow[(offset >> 8)] == (memmain+(offset & 0xFF00)))
? mem+offset // Return 'mem' copy if possible, as page could be dirty