Modified source engine (2017) developed by valve and leaked in 2020. Not for commercial purporses
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//========= Copyright Valve Corporation, All rights reserved. ============//
//
// Purpose: sheet definitions for particles and other sprite functions
//
//===========================================================================//
#ifndef PSHEET_H
#define PSHEET_H
#ifdef _WIN32
#pragma once
#endif
#include "tier1/utlobjectreference.h"
class CUtlBuffer;
// classes for keeping a dictionary of sheet files in memory. A sheet is a bunch of frames packewd
// within one texture. Each sheet has 1 or more frame sequences stored for it.
// for fast lookups to retrieve sequence data, we store the sequence information discretized into
// a fixed # of frames. If this discretenesss is a visual problem, you can lerp the blend values to get it
// perfect.
#define SEQUENCE_SAMPLE_COUNT 1024
#define MAX_SEQUENCES 64
#define MAX_IMAGES_PER_FRAME_ON_DISK 4
#define MAX_IMAGES_PER_FRAME_IN_MEMORY 2
struct SequenceSampleTextureCoords_t
{
float m_fLeft_U0;
float m_fTop_V0;
float m_fRight_U0;
float m_fBottom_V0;
float m_fLeft_U1;
float m_fTop_V1;
float m_fRight_U1;
float m_fBottom_V1;
};
struct SheetSequenceSample_t
{
// coordinates of two rectangles (old and next frame coords)
SequenceSampleTextureCoords_t m_TextureCoordData[MAX_IMAGES_PER_FRAME_IN_MEMORY];
float m_fBlendFactor;
void CopyFirstFrameToOthers(void)
{
// for old format files only supporting one image per frame
for(int i=1; i < MAX_IMAGES_PER_FRAME_IN_MEMORY; i++)
{
m_TextureCoordData[i] = m_TextureCoordData[0];
}
}
};
class CSheet
{
public:
// read form a .sht file. This is the usual thing to do
CSheet( CUtlBuffer &buf );
CSheet( void );
~CSheet( void );
// references for smart ptrs
CUtlReferenceList<CSheet> m_References;
SheetSequenceSample_t *m_pSamples[MAX_SEQUENCES];
bool m_bClamp[MAX_SEQUENCES];
bool m_bSequenceIsCopyOfAnotherSequence[MAX_SEQUENCES];
int m_nNumFrames[MAX_SEQUENCES];
float m_flFrameSpan[MAX_SEQUENCES];
};
#endif // PSHEET_H