mirror of
https://github.com/bsnes-emu/bsnes.git
synced 2025-04-02 10:42:14 -04:00
79b939e1c7
It's been a while, so here is a new release of bsnes. Unfortunately I don't have a full changelog this time. Most of the work went into stabilizing libsnes (which is used by the experimental .NET, Cocoa and Python UIs; as well as by Richard Bannister's OS X port). The Windows binary package now comes with all three variants included: bsnes.exe, the standard version that casual users should run; bsnes-debugger.exe, for SNES programmers and ROM hackers only; and bsnes-accurate.exe, which should not be used by anybody, ever. In all seriousness, bsnes-accurate.exe is bsnes with the dot-based S-PPU renderer. It's twice as slow as the normal build, and you won't really notice any differences except in Air Strike Patrol. It's there for the curious and for any SNES programmers who want to try making some really awesome video demos. Changelog: * OS X port builds once again; now requires gcc44 from Macports * libsnes API finalized * fixed a bug with S-CPU debugger breakpoints * various source cleanup
122 lines
3.4 KiB
C++
122 lines
3.4 KiB
C++
/*
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Copyright (C) 2002 Andrea Mazzoleni ( http://advancemame.sf.net )
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Copyright (C) 2001-4 Igor Pavlov ( http://www.7-zip.org )
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License version 2.1 as published by the Free Software Foundation.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#ifndef __LITERALCODER_H
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#define __LITERALCODER_H
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#include "aribitcd.h"
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#include "rcdefs.h"
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namespace NLiteral {
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const int kNumMoveBits = 5;
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class CDecoder2
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{
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CMyBitDecoder<kNumMoveBits> m_Decoders[3][1 << 8];
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public:
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void Init()
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{
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for (int i = 0; i < 3; i++)
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for (int j = 1; j < (1 << 8); j++)
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m_Decoders[i][j].Init();
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}
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BYTE DecodeNormal(CMyRangeDecoder *aRangeDecoder)
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{
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UINT32 aSymbol = 1;
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RC_INIT_VAR
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do
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{
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// aSymbol = (aSymbol << 1) | m_Decoders[0][aSymbol].Decode(aRangeDecoder);
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RC_GETBIT(kNumMoveBits, m_Decoders[0][aSymbol].m_Probability, aSymbol)
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}
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while (aSymbol < 0x100);
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RC_FLUSH_VAR
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return aSymbol;
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}
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BYTE DecodeWithMatchByte(CMyRangeDecoder *aRangeDecoder, BYTE aMatchByte)
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{
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UINT32 aSymbol = 1;
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RC_INIT_VAR
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do
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{
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UINT32 aMatchBit = (aMatchByte >> 7) & 1;
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aMatchByte <<= 1;
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// UINT32 aBit = m_Decoders[1 + aMatchBit][aSymbol].Decode(aRangeDecoder);
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// aSymbol = (aSymbol << 1) | aBit;
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UINT32 aBit;
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RC_GETBIT2(kNumMoveBits, m_Decoders[1 + aMatchBit][aSymbol].m_Probability, aSymbol,
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aBit = 0, aBit = 1)
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if (aMatchBit != aBit)
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{
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while (aSymbol < 0x100)
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{
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// aSymbol = (aSymbol << 1) | m_Decoders[0][aSymbol].Decode(aRangeDecoder);
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RC_GETBIT(kNumMoveBits, m_Decoders[0][aSymbol].m_Probability, aSymbol)
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}
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break;
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}
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}
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while (aSymbol < 0x100);
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RC_FLUSH_VAR
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return aSymbol;
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}
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};
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class CDecoder
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{
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CDecoder2 *m_Coders;
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UINT32 m_NumPrevBits;
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UINT32 m_NumPosBits;
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UINT32 m_PosMask;
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public:
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CDecoder(): m_Coders(0) {}
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~CDecoder() { Free(); }
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void Free()
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{
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delete []m_Coders;
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m_Coders = 0;
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}
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void Create(UINT32 aNumPosBits, UINT32 aNumPrevBits)
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{
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Free();
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m_NumPosBits = aNumPosBits;
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m_PosMask = (1 << aNumPosBits) - 1;
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m_NumPrevBits = aNumPrevBits;
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UINT32 aNumStates = 1 << (m_NumPrevBits + m_NumPosBits);
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m_Coders = new CDecoder2[aNumStates];
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}
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void Init()
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{
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UINT32 aNumStates = 1 << (m_NumPrevBits + m_NumPosBits);
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for (UINT32 i = 0; i < aNumStates; i++)
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m_Coders[i].Init();
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}
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UINT32 GetState(UINT32 aPos, BYTE aPrevByte) const
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{ return ((aPos & m_PosMask) << m_NumPrevBits) + (aPrevByte >> (8 - m_NumPrevBits)); }
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BYTE DecodeNormal(CMyRangeDecoder *aRangeDecoder, UINT32 aPos, BYTE aPrevByte)
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{ return m_Coders[GetState(aPos, aPrevByte)].DecodeNormal(aRangeDecoder); }
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BYTE DecodeWithMatchByte(CMyRangeDecoder *aRangeDecoder, UINT32 aPos, BYTE aPrevByte, BYTE aMatchByte)
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{ return m_Coders[GetState(aPos, aPrevByte)].DecodeWithMatchByte(aRangeDecoder, aMatchByte); }
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};
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}
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#endif
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