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particles/psheet.cpp

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+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// Purpose: sheet code for particles and other sprite functions
+//
+//===========================================================================//
+
+#include "psheet.h"
+#include "tier1/UtlStringMap.h"
+#include "tier1/utlbuffer.h"
+#include "tier2/fileutils.h"
+
+// memdbgon must be the last include file in a .cpp file!!!
+#include "tier0/memdbgon.h"
+
+
+CSheet::CSheet( void )
+{
+	memset( m_pSamples, 0, sizeof( m_pSamples ) );
+	memset( m_bClamp, 0, sizeof( m_bClamp ) );
+}
+
+CSheet::CSheet( CUtlBuffer &buf )
+{
+	memset( m_pSamples, 0, sizeof( m_pSamples ) );
+	memset( m_bClamp, 0, sizeof( m_bClamp ) );
+	memset( m_bSequenceIsCopyOfAnotherSequence, 0, sizeof( m_bSequenceIsCopyOfAnotherSequence ) );
+
+	// lets read a sheet
+	buf.ActivateByteSwappingIfBigEndian();
+	int nVersion = buf.GetInt();								// version#
+	int nNumCoordsPerFrame = (nVersion)?MAX_IMAGES_PER_FRAME_ON_DISK:1;
+
+	int nNumSequences = buf.GetInt();
+
+
+	while ( nNumSequences-- )
+	{
+		int nSequenceNumber = buf.GetInt();
+		if ( ( nSequenceNumber < 0 ) || (nSequenceNumber >= MAX_SEQUENCES ) )
+		{
+			Warning("sequence number %d too high in sheet file!!!\n", nSequenceNumber);
+			return;
+		}
+		m_bClamp[ nSequenceNumber ] = ( buf.GetInt() != 0 );
+		int nFrameCount = buf.GetInt();
+		// Save off how many frames we have for this sequence
+		m_nNumFrames[ nSequenceNumber ] = nFrameCount;
+		bool bSingleFrameSequence = ( nFrameCount == 1 );
+
+		int nTimeSamples = bSingleFrameSequence ? 1 : SEQUENCE_SAMPLE_COUNT;
+
+		m_pSamples[ nSequenceNumber ] = 
+			new SheetSequenceSample_t[ nTimeSamples ];
+
+		int fTotalSequenceTime = buf.GetFloat();
+		float InterpKnot[SEQUENCE_SAMPLE_COUNT];
+		float InterpValue[SEQUENCE_SAMPLE_COUNT];
+		SheetSequenceSample_t Samples[SEQUENCE_SAMPLE_COUNT];
+		float fCurTime = 0.;
+		for( int nFrm = 0 ; nFrm < nFrameCount; nFrm++ )
+		{
+			float fThisDuration = buf.GetFloat();
+			InterpValue[ nFrm ] = nFrm;
+			InterpKnot [ nFrm ] = SEQUENCE_SAMPLE_COUNT*( fCurTime/ fTotalSequenceTime );
+			SheetSequenceSample_t &seq = Samples[ nFrm ];
+			seq.m_fBlendFactor = 0.0f;
+			for(int nImage = 0 ; nImage< nNumCoordsPerFrame; nImage++ )
+			{
+				SequenceSampleTextureCoords_t &s=seq.m_TextureCoordData[nImage];
+				s.m_fLeft_U0	= buf.GetFloat();
+				s.m_fTop_V0		= buf.GetFloat();
+				s.m_fRight_U0	= buf.GetFloat();
+				s.m_fBottom_V0	= buf.GetFloat();
+			}
+			if ( nNumCoordsPerFrame == 1 )
+				seq.CopyFirstFrameToOthers();
+			fCurTime += fThisDuration;
+			m_flFrameSpan[nSequenceNumber] = fCurTime;
+		}
+		// now, fill in the whole table
+		for( int nIdx = 0; nIdx < nTimeSamples; nIdx++ )
+		{
+			float flIdxA, flIdxB, flInterp;
+			GetInterpolationData( InterpKnot, InterpValue, nFrameCount,
+								  SEQUENCE_SAMPLE_COUNT,
+								  nIdx, 
+								  ! ( m_bClamp[nSequenceNumber] ),
+								  &flIdxA, &flIdxB, &flInterp );
+			SheetSequenceSample_t sA = Samples[(int) flIdxA];
+			SheetSequenceSample_t sB = Samples[(int) flIdxB];
+			SheetSequenceSample_t &oseq = m_pSamples[nSequenceNumber][nIdx];
+
+			oseq.m_fBlendFactor = flInterp;
+			for(int nImage = 0 ; nImage< MAX_IMAGES_PER_FRAME_IN_MEMORY; nImage++ )
+			{
+				SequenceSampleTextureCoords_t &src0=sA.m_TextureCoordData[nImage];
+				SequenceSampleTextureCoords_t &src1=sB.m_TextureCoordData[nImage];
+				SequenceSampleTextureCoords_t &o=oseq.m_TextureCoordData[nImage];
+				o.m_fLeft_U0 = src0.m_fLeft_U0;
+				o.m_fTop_V0	= src0.m_fTop_V0;
+				o.m_fRight_U0 = src0.m_fRight_U0;
+				o.m_fBottom_V0 = src0.m_fBottom_V0;
+				o.m_fLeft_U1 = src1.m_fLeft_U0;
+				o.m_fTop_V1	= src1.m_fTop_V0;
+				o.m_fRight_U1 = src1.m_fRight_U0;
+				o.m_fBottom_V1 = src1.m_fBottom_V0;
+			}
+		}
+	}
+	// now, fill in all unseen sequences with copies of the first seen sequence to prevent crashes
+	// while editing
+	int nFirstSequence = -1;
+	for(int i=0 ; i<MAX_SEQUENCES ; i++)
+	{
+		if ( m_pSamples[i] )
+		{
+			nFirstSequence = i;
+			break;
+		}
+	}
+
+	if ( nFirstSequence != -1 )
+	{
+		for(int i=0 ; i<MAX_SEQUENCES ; i++)
+		{
+			if ( m_pSamples[i] == NULL )
+			{
+				m_pSamples[i] = m_pSamples[nFirstSequence];
+				m_bClamp[i]= m_bClamp[nFirstSequence];
+				m_nNumFrames[i] = m_nNumFrames[nFirstSequence];
+				m_bSequenceIsCopyOfAnotherSequence[i] = true;
+			}
+		}
+	}
+}
+
+CSheet::~CSheet( void )
+{
+	for( int i=0; i<NELEMS(m_pSamples); i++ )
+	{
+		if ( m_pSamples[i] && ( ! m_bSequenceIsCopyOfAnotherSequence[i] ) )
+		{
+			delete[] m_pSamples[i];
+		}
+	}
+}