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717 lines
15 KiB
C++
717 lines
15 KiB
C++
//========= Copyright Valve Corporation, All rights reserved. ============//
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//
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// Purpose:
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//
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// $NoKeywords: $
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//
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//=============================================================================//
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#include "bitbuf.h"
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#include "coordsize.h"
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#include "mathlib/vector.h"
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#include "mathlib/mathlib.h"
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#include "tier1/strtools.h"
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#include "bitvec.h"
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// FIXME: Can't use this until we get multithreaded allocations in tier0 working for tools
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// This is used by VVIS and fails to link
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// NOTE: This must be the last file included!!!
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//#include "tier0/memdbgon.h"
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#ifdef _X360
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// mandatory ... wary of above comment and isolating, tier0 is built as MT though
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#include "tier0/memdbgon.h"
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#endif
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#include "stdio.h"
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#if 0
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void CBitWrite::StartWriting( void *pData, int nBytes, int iStartBit, int nBits )
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{
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// Make sure it's dword aligned and padded.
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Assert( (nBytes % 4) == 0 );
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Assert(((unsigned long)pData & 3) == 0);
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Assert( iStartBit == 0 );
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m_pData = (uint32 *) pData;
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m_pDataOut = m_pData;
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m_nDataBytes = nBytes;
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if ( nBits == -1 )
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{
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m_nDataBits = nBytes << 3;
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}
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else
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{
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Assert( nBits <= nBytes*8 );
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m_nDataBits = nBits;
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}
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m_bOverflow = false;
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m_nOutBufWord = 0;
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m_nOutBitsAvail = 32;
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m_pBufferEnd = m_pDataOut + ( nBytes >> 2 );
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}
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const uint32 CBitBuffer::s_nMaskTable[33] = {
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0,
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( 1 << 1 ) - 1,
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( 1 << 2 ) - 1,
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( 1 << 3 ) - 1,
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( 1 << 4 ) - 1,
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( 1 << 5 ) - 1,
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( 1 << 6 ) - 1,
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( 1 << 7 ) - 1,
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( 1 << 8 ) - 1,
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( 1 << 9 ) - 1,
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( 1 << 10 ) - 1,
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( 1 << 11 ) - 1,
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( 1 << 12 ) - 1,
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( 1 << 13 ) - 1,
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( 1 << 14 ) - 1,
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( 1 << 15 ) - 1,
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( 1 << 16 ) - 1,
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( 1 << 17 ) - 1,
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( 1 << 18 ) - 1,
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( 1 << 19 ) - 1,
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( 1 << 20 ) - 1,
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( 1 << 21 ) - 1,
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( 1 << 22 ) - 1,
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( 1 << 23 ) - 1,
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( 1 << 24 ) - 1,
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( 1 << 25 ) - 1,
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( 1 << 26 ) - 1,
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( 1 << 27 ) - 1,
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( 1 << 28 ) - 1,
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( 1 << 29 ) - 1,
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( 1 << 30 ) - 1,
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0x7fffffff,
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0xffffffff,
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};
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bool CBitWrite::WriteString( const char *pStr )
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{
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if(pStr)
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{
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while( *pStr )
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{
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WriteChar( * ( pStr++ ) );
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}
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}
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WriteChar( 0 );
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return !IsOverflowed();
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}
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void CBitWrite::WriteLongLong(int64 val)
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{
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uint *pLongs = (uint*)&val;
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// Insert the two DWORDS according to network endian
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const short endianIndex = 0x0100;
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byte *idx = (byte*)&endianIndex;
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WriteUBitLong(pLongs[*idx++], sizeof(long) << 3);
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WriteUBitLong(pLongs[*idx], sizeof(long) << 3);
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}
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bool CBitWrite::WriteBits(const void *pInData, int nBits)
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{
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unsigned char *pOut = (unsigned char*)pInData;
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int nBitsLeft = nBits;
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// Bounds checking..
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if ( ( GetNumBitsWritten() + nBits) > m_nDataBits )
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{
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SetOverflowFlag();
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CallErrorHandler( BITBUFERROR_BUFFER_OVERRUN, m_pDebugName );
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return false;
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}
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// !! speed!! need fast paths
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// write remaining bytes
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while ( nBitsLeft >= 8 )
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{
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WriteUBitLong( *pOut, 8, false );
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++pOut;
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nBitsLeft -= 8;
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}
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// write remaining bits
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if ( nBitsLeft )
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{
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WriteUBitLong( *pOut, nBitsLeft, false );
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}
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return !IsOverflowed();
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}
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void CBitWrite::WriteBytes( const void *pBuf, int nBytes )
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{
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WriteBits(pBuf, nBytes << 3);
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}
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void CBitWrite::WriteBitCoord (const float f)
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{
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int signbit = (f <= -COORD_RESOLUTION);
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int intval = (int)abs(f);
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int fractval = abs((int)(f*COORD_DENOMINATOR)) & (COORD_DENOMINATOR-1);
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// Send the bit flags that indicate whether we have an integer part and/or a fraction part.
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WriteOneBit( intval );
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WriteOneBit( fractval );
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if ( intval || fractval )
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{
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// Send the sign bit
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WriteOneBit( signbit );
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// Send the integer if we have one.
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if ( intval )
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{
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// Adjust the integers from [1..MAX_COORD_VALUE] to [0..MAX_COORD_VALUE-1]
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intval--;
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WriteUBitLong( (unsigned int)intval, COORD_INTEGER_BITS );
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}
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// Send the fraction if we have one
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if ( fractval )
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{
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WriteUBitLong( (unsigned int)fractval, COORD_FRACTIONAL_BITS );
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}
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}
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}
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void CBitWrite::WriteBitCoordMP (const float f, bool bIntegral, bool bLowPrecision )
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{
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int signbit = (f <= -( bLowPrecision ? COORD_RESOLUTION_LOWPRECISION : COORD_RESOLUTION ));
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int intval = (int)abs(f);
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int fractval = bLowPrecision ?
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( abs((int)(f*COORD_DENOMINATOR_LOWPRECISION)) & (COORD_DENOMINATOR_LOWPRECISION-1) ) :
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( abs((int)(f*COORD_DENOMINATOR)) & (COORD_DENOMINATOR-1) );
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bool bInBounds = intval < (1 << COORD_INTEGER_BITS_MP );
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WriteOneBit( bInBounds );
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if ( bIntegral )
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{
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// Send the sign bit
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WriteOneBit( intval );
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if ( intval )
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{
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WriteOneBit( signbit );
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// Send the integer if we have one.
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// Adjust the integers from [1..MAX_COORD_VALUE] to [0..MAX_COORD_VALUE-1]
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intval--;
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if ( bInBounds )
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{
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WriteUBitLong( (unsigned int)intval, COORD_INTEGER_BITS_MP );
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}
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else
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{
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WriteUBitLong( (unsigned int)intval, COORD_INTEGER_BITS );
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}
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}
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}
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else
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{
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// Send the bit flags that indicate whether we have an integer part and/or a fraction part.
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WriteOneBit( intval );
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// Send the sign bit
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WriteOneBit( signbit );
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// Send the integer if we have one.
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if ( intval )
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{
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// Adjust the integers from [1..MAX_COORD_VALUE] to [0..MAX_COORD_VALUE-1]
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intval--;
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if ( bInBounds )
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{
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WriteUBitLong( (unsigned int)intval, COORD_INTEGER_BITS_MP );
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}
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else
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{
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WriteUBitLong( (unsigned int)intval, COORD_INTEGER_BITS );
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}
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}
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WriteUBitLong( (unsigned int)fractval, bLowPrecision ? COORD_FRACTIONAL_BITS_MP_LOWPRECISION : COORD_FRACTIONAL_BITS );
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}
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}
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void CBitWrite::SeekToBit( int nBit )
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{
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TempFlush();
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m_pDataOut = m_pData + ( nBit / 32 );
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m_nOutBufWord = *( m_pDataOut );
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m_nOutBitsAvail = 32 - ( nBit & 31 );
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}
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void CBitWrite::WriteBitVec3Coord( const Vector& fa )
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{
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int xflag, yflag, zflag;
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xflag = (fa[0] >= COORD_RESOLUTION) || (fa[0] <= -COORD_RESOLUTION);
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yflag = (fa[1] >= COORD_RESOLUTION) || (fa[1] <= -COORD_RESOLUTION);
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zflag = (fa[2] >= COORD_RESOLUTION) || (fa[2] <= -COORD_RESOLUTION);
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WriteOneBit( xflag );
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WriteOneBit( yflag );
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WriteOneBit( zflag );
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if ( xflag )
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WriteBitCoord( fa[0] );
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if ( yflag )
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WriteBitCoord( fa[1] );
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if ( zflag )
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WriteBitCoord( fa[2] );
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}
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void CBitWrite::WriteBitNormal( float f )
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{
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int signbit = (f <= -NORMAL_RESOLUTION);
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// NOTE: Since +/-1 are valid values for a normal, I'm going to encode that as all ones
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unsigned int fractval = abs( (int)(f*NORMAL_DENOMINATOR) );
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// clamp..
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if (fractval > NORMAL_DENOMINATOR)
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fractval = NORMAL_DENOMINATOR;
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// Send the sign bit
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WriteOneBit( signbit );
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// Send the fractional component
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WriteUBitLong( fractval, NORMAL_FRACTIONAL_BITS );
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}
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void CBitWrite::WriteBitVec3Normal( const Vector& fa )
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{
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int xflag, yflag;
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xflag = (fa[0] >= NORMAL_RESOLUTION) || (fa[0] <= -NORMAL_RESOLUTION);
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yflag = (fa[1] >= NORMAL_RESOLUTION) || (fa[1] <= -NORMAL_RESOLUTION);
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WriteOneBit( xflag );
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WriteOneBit( yflag );
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if ( xflag )
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WriteBitNormal( fa[0] );
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if ( yflag )
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WriteBitNormal( fa[1] );
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// Write z sign bit
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int signbit = (fa[2] <= -NORMAL_RESOLUTION);
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WriteOneBit( signbit );
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}
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void CBitWrite::WriteBitAngle( float fAngle, int numbits )
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{
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unsigned int shift = GetBitForBitnum(numbits);
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unsigned int mask = shift - 1;
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int d = (int)( (fAngle / 360.0) * shift );
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d &= mask;
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WriteUBitLong((unsigned int)d, numbits);
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}
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bool CBitWrite::WriteBitsFromBuffer( bf_read *pIn, int nBits )
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{
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// This could be optimized a little by
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while ( nBits > 32 )
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{
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WriteUBitLong( pIn->ReadUBitLong( 32 ), 32 );
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nBits -= 32;
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}
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WriteUBitLong( pIn->ReadUBitLong( nBits ), nBits );
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return !IsOverflowed() && !pIn->IsOverflowed();
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}
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void CBitWrite::WriteBitAngles( const QAngle& fa )
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{
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// FIXME:
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Vector tmp( fa.x, fa.y, fa.z );
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WriteBitVec3Coord( tmp );
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}
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bool CBitRead::Seek( int nPosition )
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{
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bool bSucc = true;
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if ( nPosition < 0 || nPosition > m_nDataBits)
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{
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SetOverflowFlag();
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bSucc = false;
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nPosition = m_nDataBits;
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}
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int nHead = m_nDataBytes & 3; // non-multiple-of-4 bytes at head of buffer. We put the "round off"
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// at the head to make reading and detecting the end efficient.
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int nByteOfs = nPosition / 8;
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if ( ( m_nDataBytes < 4 ) || ( nHead && ( nByteOfs < nHead ) ) )
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{
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// partial first dword
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uint8 const *pPartial = ( uint8 const *) m_pData;
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if ( m_pData )
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{
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m_nInBufWord = *( pPartial++ );
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if ( nHead > 1 )
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m_nInBufWord |= ( *pPartial++ ) << 8;
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if ( nHead > 2 )
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m_nInBufWord |= ( *pPartial++ ) << 16;
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}
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m_pDataIn = ( uint32 const * ) pPartial;
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m_nInBufWord >>= ( nPosition & 31 );
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m_nBitsAvail = ( nHead << 3 ) - ( nPosition & 31 );
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}
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else
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{
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int nAdjPosition = nPosition - ( nHead << 3 );
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m_pDataIn = reinterpret_cast<uint32 const *> (
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reinterpret_cast<uint8 const *>( m_pData ) + ( ( nAdjPosition / 32 ) << 2 ) + nHead );
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if ( m_pData )
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{
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m_nBitsAvail = 32;
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GrabNextDWord();
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}
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else
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{
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m_nInBufWord = 0;
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m_nBitsAvail = 1;
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}
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m_nInBufWord >>= ( nAdjPosition & 31 );
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m_nBitsAvail = min( m_nBitsAvail, 32 - ( nAdjPosition & 31 ) ); // in case grabnextdword overflowed
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}
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return bSucc;
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}
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void CBitRead::StartReading( const void *pData, int nBytes, int iStartBit, int nBits )
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{
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// Make sure it's dword aligned and padded.
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Assert(((unsigned long)pData & 3) == 0);
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m_pData = (uint32 *) pData;
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m_pDataIn = m_pData;
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m_nDataBytes = nBytes;
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if ( nBits == -1 )
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{
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m_nDataBits = nBytes << 3;
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}
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else
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{
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Assert( nBits <= nBytes*8 );
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m_nDataBits = nBits;
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}
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m_bOverflow = false;
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m_pBufferEnd = reinterpret_cast<uint32 const *> ( reinterpret_cast< uint8 const *> (m_pData) + nBytes );
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if ( m_pData )
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Seek( iStartBit );
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}
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bool CBitRead::ReadString( char *pStr, int maxLen, bool bLine, int *pOutNumChars )
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{
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Assert( maxLen != 0 );
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bool bTooSmall = false;
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int iChar = 0;
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while(1)
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{
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char val = ReadChar();
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if ( val == 0 )
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break;
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else if ( bLine && val == '\n' )
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break;
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if ( iChar < (maxLen-1) )
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{
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pStr[iChar] = val;
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++iChar;
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}
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else
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{
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bTooSmall = true;
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}
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}
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// Make sure it's null-terminated.
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Assert( iChar < maxLen );
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pStr[iChar] = 0;
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if ( pOutNumChars )
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*pOutNumChars = iChar;
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return !IsOverflowed() && !bTooSmall;
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}
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char* CBitRead::ReadAndAllocateString( bool *pOverflow )
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{
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char str[2048];
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int nChars;
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bool bOverflow = !ReadString( str, sizeof( str ), false, &nChars );
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if ( pOverflow )
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*pOverflow = bOverflow;
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// Now copy into the output and return it;
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char *pRet = new char[ nChars + 1 ];
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for ( int i=0; i <= nChars; i++ )
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pRet[i] = str[i];
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return pRet;
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}
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int64 CBitRead::ReadLongLong( void )
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{
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int64 retval;
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uint *pLongs = (uint*)&retval;
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// Read the two DWORDs according to network endian
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const short endianIndex = 0x0100;
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byte *idx = (byte*)&endianIndex;
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pLongs[*idx++] = ReadUBitLong(sizeof(long) << 3);
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pLongs[*idx] = ReadUBitLong(sizeof(long) << 3);
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return retval;
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}
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void CBitRead::ReadBits(void *pOutData, int nBits)
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{
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unsigned char *pOut = (unsigned char*)pOutData;
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int nBitsLeft = nBits;
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// align output to dword boundary
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while( ((unsigned long)pOut & 3) != 0 && nBitsLeft >= 8 )
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{
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*pOut = (unsigned char)ReadUBitLong(8);
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++pOut;
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nBitsLeft -= 8;
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}
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// X360TBD: Can't read dwords in ReadBits because they'll get swapped
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if ( IsPC() )
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{
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// read dwords
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while ( nBitsLeft >= 32 )
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{
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*((unsigned long*)pOut) = ReadUBitLong(32);
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pOut += sizeof(unsigned long);
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nBitsLeft -= 32;
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}
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}
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// read remaining bytes
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while ( nBitsLeft >= 8 )
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{
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*pOut = ReadUBitLong(8);
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++pOut;
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nBitsLeft -= 8;
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}
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// read remaining bits
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if ( nBitsLeft )
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{
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*pOut = ReadUBitLong(nBitsLeft);
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}
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}
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bool CBitRead::ReadBytes(void *pOut, int nBytes)
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{
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ReadBits(pOut, nBytes << 3);
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return !IsOverflowed();
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}
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float CBitRead::ReadBitAngle( int numbits )
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{
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float shift = (float)( GetBitForBitnum(numbits) );
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int i = ReadUBitLong( numbits );
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float fReturn = (float)i * (360.0 / shift);
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return fReturn;
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}
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// Basic Coordinate Routines (these contain bit-field size AND fixed point scaling constants)
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float CBitRead::ReadBitCoord (void)
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{
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int intval=0,fractval=0,signbit=0;
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float value = 0.0;
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// Read the required integer and fraction flags
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intval = ReadOneBit();
|
|
fractval = ReadOneBit();
|
|
|
|
// If we got either parse them, otherwise it's a zero.
|
|
if ( intval || fractval )
|
|
{
|
|
// Read the sign bit
|
|
signbit = ReadOneBit();
|
|
|
|
// If there's an integer, read it in
|
|
if ( intval )
|
|
{
|
|
// Adjust the integers from [0..MAX_COORD_VALUE-1] to [1..MAX_COORD_VALUE]
|
|
intval = ReadUBitLong( COORD_INTEGER_BITS ) + 1;
|
|
}
|
|
|
|
// If there's a fraction, read it in
|
|
if ( fractval )
|
|
{
|
|
fractval = ReadUBitLong( COORD_FRACTIONAL_BITS );
|
|
}
|
|
|
|
// Calculate the correct floating point value
|
|
value = intval + ((float)fractval * COORD_RESOLUTION);
|
|
|
|
// Fixup the sign if negative.
|
|
if ( signbit )
|
|
value = -value;
|
|
}
|
|
|
|
return value;
|
|
}
|
|
|
|
float CBitRead::ReadBitCoordMP( bool bIntegral, bool bLowPrecision )
|
|
{
|
|
int intval=0,fractval=0,signbit=0;
|
|
float value = 0.0;
|
|
|
|
bool bInBounds = ReadOneBit() ? true : false;
|
|
|
|
if ( bIntegral )
|
|
{
|
|
// Read the required integer and fraction flags
|
|
intval = ReadOneBit();
|
|
// If we got either parse them, otherwise it's a zero.
|
|
if ( intval )
|
|
{
|
|
// Read the sign bit
|
|
signbit = ReadOneBit();
|
|
|
|
// If there's an integer, read it in
|
|
// Adjust the integers from [0..MAX_COORD_VALUE-1] to [1..MAX_COORD_VALUE]
|
|
if ( bInBounds )
|
|
{
|
|
value = ReadUBitLong( COORD_INTEGER_BITS_MP ) + 1;
|
|
}
|
|
else
|
|
{
|
|
value = ReadUBitLong( COORD_INTEGER_BITS ) + 1;
|
|
}
|
|
}
|
|
}
|
|
else
|
|
{
|
|
// Read the required integer and fraction flags
|
|
intval = ReadOneBit();
|
|
|
|
// Read the sign bit
|
|
signbit = ReadOneBit();
|
|
|
|
// If we got either parse them, otherwise it's a zero.
|
|
if ( intval )
|
|
{
|
|
if ( bInBounds )
|
|
{
|
|
intval = ReadUBitLong( COORD_INTEGER_BITS_MP ) + 1;
|
|
}
|
|
else
|
|
{
|
|
intval = ReadUBitLong( COORD_INTEGER_BITS ) + 1;
|
|
}
|
|
}
|
|
|
|
// If there's a fraction, read it in
|
|
fractval = ReadUBitLong( bLowPrecision ? COORD_FRACTIONAL_BITS_MP_LOWPRECISION : COORD_FRACTIONAL_BITS );
|
|
|
|
// Calculate the correct floating point value
|
|
value = intval + ((float)fractval * ( bLowPrecision ? COORD_RESOLUTION_LOWPRECISION : COORD_RESOLUTION ) );
|
|
}
|
|
|
|
// Fixup the sign if negative.
|
|
if ( signbit )
|
|
value = -value;
|
|
|
|
return value;
|
|
}
|
|
|
|
void CBitRead::ReadBitVec3Coord( Vector& fa )
|
|
{
|
|
int xflag, yflag, zflag;
|
|
|
|
// This vector must be initialized! Otherwise, If any of the flags aren't set,
|
|
// the corresponding component will not be read and will be stack garbage.
|
|
fa.Init( 0, 0, 0 );
|
|
|
|
xflag = ReadOneBit();
|
|
yflag = ReadOneBit();
|
|
zflag = ReadOneBit();
|
|
|
|
if ( xflag )
|
|
fa[0] = ReadBitCoord();
|
|
if ( yflag )
|
|
fa[1] = ReadBitCoord();
|
|
if ( zflag )
|
|
fa[2] = ReadBitCoord();
|
|
}
|
|
|
|
float CBitRead::ReadBitNormal (void)
|
|
{
|
|
// Read the sign bit
|
|
int signbit = ReadOneBit();
|
|
|
|
// Read the fractional part
|
|
unsigned int fractval = ReadUBitLong( NORMAL_FRACTIONAL_BITS );
|
|
|
|
// Calculate the correct floating point value
|
|
float value = (float)fractval * NORMAL_RESOLUTION;
|
|
|
|
// Fixup the sign if negative.
|
|
if ( signbit )
|
|
value = -value;
|
|
|
|
return value;
|
|
}
|
|
|
|
void CBitRead::ReadBitVec3Normal( Vector& fa )
|
|
{
|
|
int xflag = ReadOneBit();
|
|
int yflag = ReadOneBit();
|
|
|
|
if (xflag)
|
|
fa[0] = ReadBitNormal();
|
|
else
|
|
fa[0] = 0.0f;
|
|
|
|
if (yflag)
|
|
fa[1] = ReadBitNormal();
|
|
else
|
|
fa[1] = 0.0f;
|
|
|
|
// The first two imply the third (but not its sign)
|
|
int znegative = ReadOneBit();
|
|
|
|
float fafafbfb = fa[0] * fa[0] + fa[1] * fa[1];
|
|
if (fafafbfb < 1.0f)
|
|
fa[2] = sqrt( 1.0f - fafafbfb );
|
|
else
|
|
fa[2] = 0.0f;
|
|
|
|
if (znegative)
|
|
fa[2] = -fa[2];
|
|
}
|
|
|
|
void CBitRead::ReadBitAngles( QAngle& fa )
|
|
{
|
|
Vector tmp;
|
|
ReadBitVec3Coord( tmp );
|
|
fa.Init( tmp.x, tmp.y, tmp.z );
|
|
}
|
|
|
|
#endif
|