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particles/psheet.h

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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
+