mirror of
https://github.com/id-Software/DOOM-3-BFG.git
synced 2024-12-13 14:01:14 +00:00
453 lines
12 KiB
C++
453 lines
12 KiB
C++
/*
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===========================================================================
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Doom 3 BFG Edition GPL Source Code
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Copyright (C) 1993-2012 id Software LLC, a ZeniMax Media company.
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This file is part of the Doom 3 BFG Edition GPL Source Code ("Doom 3 BFG Edition Source Code").
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Doom 3 BFG Edition Source Code is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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Doom 3 BFG Edition Source Code 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
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with Doom 3 BFG Edition Source Code. If not, see <http://www.gnu.org/licenses/>.
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In addition, the Doom 3 BFG Edition Source Code is also subject to certain additional terms. You should have received a copy of these additional terms immediately following the terms and conditions of the GNU General Public License which accompanied the Doom 3 BFG Edition Source Code. If not, please request a copy in writing from id Software at the address below.
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If you have questions concerning this license or the applicable additional terms, you may contact in writing id Software LLC, c/o ZeniMax Media Inc., Suite 120, Rockville, Maryland 20850 USA.
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===========================================================================
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*/
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#pragma hdrstop
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#include "precompiled.h"
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#define NBM( x ) (int32)( ( 1LL << x ) - 1 )
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int maskForNumBits[33] = { NBM( 0x00 ), NBM( 0x01 ), NBM( 0x02 ), NBM( 0x03 ),
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NBM( 0x04 ), NBM( 0x05 ), NBM( 0x06 ), NBM( 0x07 ),
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NBM( 0x08 ), NBM( 0x09 ), NBM( 0x0A ), NBM( 0x0B ),
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NBM( 0x0C ), NBM( 0x0D ), NBM( 0x0E ), NBM( 0x0F ),
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NBM( 0x10 ), NBM( 0x11 ), NBM( 0x12 ), NBM( 0x13 ),
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NBM( 0x14 ), NBM( 0x15 ), NBM( 0x16 ), NBM( 0x17 ),
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NBM( 0x18 ), NBM( 0x19 ), NBM( 0x1A ), NBM( 0x1B ),
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NBM( 0x1C ), NBM( 0x1D ), NBM( 0x1E ), NBM( 0x1F ), -1
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};
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#define NBS( x ) (int32)( (-1) << ( x - 1 ) )
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int signForNumBits[33] = { NBS( 0x01 ), NBS( 0x01 ), NBS( 0x02 ), NBS( 0x03 ),
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NBS( 0x04 ), NBS( 0x05 ), NBS( 0x06 ), NBS( 0x07 ),
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NBS( 0x08 ), NBS( 0x09 ), NBS( 0x0A ), NBS( 0x0B ),
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NBS( 0x0C ), NBS( 0x0D ), NBS( 0x0E ), NBS( 0x0F ),
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NBS( 0x10 ), NBS( 0x11 ), NBS( 0x12 ), NBS( 0x13 ),
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NBS( 0x14 ), NBS( 0x15 ), NBS( 0x16 ), NBS( 0x17 ),
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NBS( 0x18 ), NBS( 0x19 ), NBS( 0x1A ), NBS( 0x1B ),
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NBS( 0x1C ), NBS( 0x1D ), NBS( 0x1E ), NBS( 0x1F ), NBS( 0x20 )
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};
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/*
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========================
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idSWFBitStream::idSWFBitStream
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========================
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*/
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idSWFBitStream::idSWFBitStream()
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{
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free = false;
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Free();
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}
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/*
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========================
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idSWFBitStream::operator=
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========================
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*/
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idSWFBitStream& idSWFBitStream::operator=( idSWFBitStream& other )
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{
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Free();
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free = other.free;
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startp = other.startp;
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readp = other.readp;
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endp = other.endp;
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currentBit = other.currentBit;
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currentByte = other.currentByte;
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if( other.free )
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{
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// this is actually quite dangerous, but we need to do this
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// because these things are copied around inside idList
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other.free = false;
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}
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return *this;
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}
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/*
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========================
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idSWFBitStream::Free
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========================
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*/
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void idSWFBitStream::Free()
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{
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if( free )
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{
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Mem_Free( ( void* )startp );
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}
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free = false;
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startp = NULL;
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endp = NULL;
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readp = NULL;
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ResetBits();
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}
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/*
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========================
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idSWFBitStream::Load
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========================
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*/
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void idSWFBitStream::Load( const byte* data, uint32 len, bool copy )
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{
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Free();
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if( copy )
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{
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free = true;
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startp = ( const byte* )Mem_Alloc( len, TAG_SWF );
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memcpy( ( byte* )startp, data, len );
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}
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else
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{
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free = false;
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startp = data;
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}
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endp = startp + len;
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readp = startp;
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ResetBits();
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}
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/*
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========================
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idSWFBitStream::ReadEncodedU32
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========================
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*/
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uint32 idSWFBitStream::ReadEncodedU32()
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{
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uint32 result = 0;
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for( int i = 0; i < 5; i++ )
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{
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byte b = ReadU8();
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result |= ( b & 0x7F ) << ( 7 * i );
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if( ( b & 0x80 ) == 0 )
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{
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return result;
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}
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}
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return result;
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}
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/*
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========================
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idSWFBitStream::ReadData
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========================
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*/
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const byte* idSWFBitStream::ReadData( int size )
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{
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assert( readp >= startp && readp <= endp );
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ResetBits();
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if( readp + size > endp )
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{
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// buffer overrun
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assert( false );
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readp = endp;
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return startp;
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}
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const byte* buffer = readp;
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readp += size;
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assert( readp >= startp && readp <= endp );
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return buffer;
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}
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/*
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========================
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idSWFBitStream::ReadInternalU
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========================
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*/
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ID_FORCE_INLINE unsigned int idSWFBitStream::ReadInternalU( uint64& regCurrentBit, uint64& regCurrentByte, unsigned int numBits )
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{
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assert( numBits <= 32 );
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// read bits with only one microcoded shift instruction (shift with variable) on the consoles
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// this routine never reads more than 7 bits beyond the requested number of bits from the stream
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// such that calling ResetBits() never discards more than 7 bits and aligns with the next byte
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uint64 numExtraBytes = ( numBits - regCurrentBit + 7 ) >> 3;
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regCurrentBit = regCurrentBit + ( numExtraBytes << 3 ) - numBits;
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for( int i = 0; i < numExtraBytes; i++ )
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{
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regCurrentByte = ( regCurrentByte << 8 ) | readp[i];
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}
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readp += numExtraBytes;
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return ( unsigned int )( ( regCurrentByte >> regCurrentBit ) & maskForNumBits[numBits] );
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}
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/*
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========================
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idSWFBitStream::ReadInternalS
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========================
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*/
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ID_FORCE_INLINE int idSWFBitStream::ReadInternalS( uint64& regCurrentBit, uint64& regCurrentByte, unsigned int numBits )
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{
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int i = ( int )ReadInternalU( regCurrentBit, regCurrentByte, numBits );
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// sign extend without microcoded shift instrunction (shift with variable) on the consoles
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int s = signForNumBits[numBits];
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return ( ( i + s ) ^ s );
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}
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/*
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========================
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idSWFBitStream::ReadU
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========================
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*/
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unsigned int idSWFBitStream::ReadU( unsigned int numBits )
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{
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return ReadInternalU( currentBit, currentByte, numBits );
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}
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/*
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========================
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idSWFBitStream::ReadS
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========================
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*/
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int idSWFBitStream::ReadS( unsigned int numBits )
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{
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return ReadInternalS( currentBit, currentByte, numBits );
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}
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/*
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========================
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idSWFBitStream::ReadRect
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========================
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*/
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void idSWFBitStream::ReadRect( swfRect_t& rect )
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{
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uint64 regCurrentBit = 0;
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uint64 regCurrentByte = 0;
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int nBits = ReadInternalU( regCurrentBit, regCurrentByte, 5 );
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int tl_x = ReadInternalS( regCurrentBit, regCurrentByte, nBits );
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int br_x = ReadInternalS( regCurrentBit, regCurrentByte, nBits );
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int tl_y = ReadInternalS( regCurrentBit, regCurrentByte, nBits );
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int br_y = ReadInternalS( regCurrentBit, regCurrentByte, nBits );
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rect.tl.x = SWFTWIP( tl_x );
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rect.br.x = SWFTWIP( br_x );
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rect.tl.y = SWFTWIP( tl_y );
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rect.br.y = SWFTWIP( br_y );
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currentBit = regCurrentBit;
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currentByte = regCurrentByte;
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}
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/*
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========================
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idSWFBitStream::ReadMatrix
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========================
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*/
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void idSWFBitStream::ReadMatrix( swfMatrix_t& matrix )
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{
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uint64 regCurrentBit = 0;
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uint64 regCurrentByte = 0;
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unsigned int hasScale = ReadInternalU( regCurrentBit, regCurrentByte, 1 );
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int xx;
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int yy;
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if( !hasScale )
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{
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xx = 65536;
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yy = 65536;
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}
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else
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{
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int nBits = ReadInternalU( regCurrentBit, regCurrentByte, 5 );
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xx = ReadInternalS( regCurrentBit, regCurrentByte, nBits );
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yy = ReadInternalS( regCurrentBit, regCurrentByte, nBits );
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}
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unsigned int hasRotate = ReadInternalU( regCurrentBit, regCurrentByte, 1 );
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int yx;
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int xy;
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if( !hasRotate )
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{
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yx = 0;
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xy = 0;
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}
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else
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{
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int nBits = ReadInternalU( regCurrentBit, regCurrentByte, 5 );
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yx = ReadInternalS( regCurrentBit, regCurrentByte, nBits );
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xy = ReadInternalS( regCurrentBit, regCurrentByte, nBits );
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}
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int nBits = ReadInternalU( regCurrentBit, regCurrentByte, 5 );
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int tx = ReadInternalS( regCurrentBit, regCurrentByte, nBits );
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int ty = ReadInternalS( regCurrentBit, regCurrentByte, nBits );
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currentBit = regCurrentBit;
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currentByte = regCurrentByte;
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matrix.xx = SWFFIXED16( xx );
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matrix.yy = SWFFIXED16( yy );
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matrix.yx = SWFFIXED16( yx );
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matrix.xy = SWFFIXED16( xy );
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matrix.tx = SWFTWIP( tx );
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matrix.ty = SWFTWIP( ty );
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}
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/*
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========================
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idSWFBitStream::ReadColorXFormRGBA
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========================
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*/
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void idSWFBitStream::ReadColorXFormRGBA( swfColorXform_t& cxf )
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{
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uint64 regCurrentBit = 0;
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uint64 regCurrentByte = 0;
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unsigned int hasAddTerms = ReadInternalU( regCurrentBit, regCurrentByte, 1 );
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unsigned int hasMulTerms = ReadInternalU( regCurrentBit, regCurrentByte, 1 );
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int nBits = ReadInternalU( regCurrentBit, regCurrentByte, 4 );
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union
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{
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int i[4];
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} m;
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union
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{
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int i[4];
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} a;
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if( !hasMulTerms )
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{
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m.i[0] = 256;
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m.i[1] = 256;
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m.i[2] = 256;
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m.i[3] = 256;
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}
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else
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{
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m.i[0] = ReadInternalS( regCurrentBit, regCurrentByte, nBits );
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m.i[1] = ReadInternalS( regCurrentBit, regCurrentByte, nBits );
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m.i[2] = ReadInternalS( regCurrentBit, regCurrentByte, nBits );
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m.i[3] = ReadInternalS( regCurrentBit, regCurrentByte, nBits );
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}
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if( !hasAddTerms )
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{
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a.i[0] = 0;
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a.i[1] = 0;
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a.i[2] = 0;
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a.i[3] = 0;
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}
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else
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{
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a.i[0] = ReadInternalS( regCurrentBit, regCurrentByte, nBits );
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a.i[1] = ReadInternalS( regCurrentBit, regCurrentByte, nBits );
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a.i[2] = ReadInternalS( regCurrentBit, regCurrentByte, nBits );
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a.i[3] = ReadInternalS( regCurrentBit, regCurrentByte, nBits );
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}
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currentBit = regCurrentBit;
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currentByte = regCurrentByte;
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for( int i = 0; i < 4; i++ )
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{
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cxf.mul[i] = SWFFIXED8( m.i[i] );
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cxf.add[i] = SWFFIXED8( a.i[i] );
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}
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}
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/*
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========================
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idSWFBitStream::ReadString
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========================
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*/
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const char* idSWFBitStream::ReadString()
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{
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return ( const char* )ReadData( idStr::Length( ( const char* )readp ) + 1 );
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}
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/*
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========================
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idSWFBitStream::ReadColorRGB
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========================
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*/
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void idSWFBitStream::ReadColorRGB( swfColorRGB_t& color )
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{
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ResetBits();
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color.r = *readp++;
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color.g = *readp++;
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color.b = *readp++;
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}
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/*
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========================
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idSWFBitStream::ReadColorRGBA
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========================
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*/
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void idSWFBitStream::ReadColorRGBA( swfColorRGBA_t& color )
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{
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ResetBits();
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color.r = *readp++;
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color.g = *readp++;
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color.b = *readp++;
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color.a = *readp++;
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}
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/*
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========================
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idSWFBitStream::ReadGradient
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========================
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*/
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void idSWFBitStream::ReadGradient( swfGradient_t& grad, bool rgba )
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{
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grad.numGradients = ReadU8() & 0xF; // the top 4 bits control spread and interpolation mode, but we ignore them
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for( int i = 0; i < grad.numGradients; i++ )
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{
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grad.gradientRecords[i].startRatio = ReadU8();
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if( rgba )
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{
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ReadColorRGBA( grad.gradientRecords[i].startColor );
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}
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else
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{
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ReadColorRGB( grad.gradientRecords[i].startColor );
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}
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grad.gradientRecords[i].endRatio = grad.gradientRecords[i].startRatio;
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grad.gradientRecords[i].endColor = grad.gradientRecords[i].startColor;
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}
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}
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/*
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========================
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idSWFBitStream::ReadMorphGradient
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========================
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*/
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void idSWFBitStream::ReadMorphGradient( swfGradient_t& grad )
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{
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grad.numGradients = ReadU8() & 0xF; // the top 4 bits control spread and interpolation mode, but we ignore them
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for( int i = 0; i < grad.numGradients; i++ )
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{
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grad.gradientRecords[i].startRatio = ReadU8();
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ReadColorRGBA( grad.gradientRecords[i].startColor );
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grad.gradientRecords[i].endRatio = ReadU8();
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ReadColorRGBA( grad.gradientRecords[i].endColor );
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}
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}
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