//:Header:222, "_texture", 3b9b50d4
//
// File: llgfx_stexture.h
//
// G A M E.O.N.E - LOW LEVEL LIB V1.0
// Copyright (C) 2001 LEVEL ONE ENTERTAINMENT, 
// Licensed under the terms of LGPL.
//:---------------------------------------------------------------------------
//:Description
//
// Texture struktur - laden, convertieren, blitten
//
//:-----------------------------------------------------------------------------

#if !defined(LLGFX_STEXTURE_INCLUDED)
#define LLGFX_STEXTURE_INCLUDED


typedef enum {
	TXFMT_ANY,			// unbestimmt
	TXFMT_RGB_332,		// 8Bit/Pixel ohne Palette
	TXFMT_I_8,			// 8Bit/Pixel Intensity, MONO Format ohne Palette
	TXFMT_P_8,			// 8Bit/Pixel mit Palette
	TXFMT_RGB_555,		// 16Bit/Pixel 555 Format
	TXFMT_RGB_565,		// 16Bit/Pixel 565 Format
	TXFMT_RGB,			// 24 Bit/Pixel (TXMT_RGB_888)
	TXFMT_RxGxBx,		// scanline*R(8bit) + scanline*G(8bit) + scanline*B(8bit)
	TXFMT_ARGB,			// 24 Bit/Pixel + 8 Bit Alpha 0..255
	TXFMT_UNKNOWN		// ende kennung
} TxFormat;

struct _texture
{
	TxFormat format;	// TX_FMT
	int width;			// in Pixels
	int height;			// in Pixels
	int pitch;			// bytes pro rasterzeile.
	int size;			// Gesamtbytes databereich.
	int pixsize;		// bytes pro pixel
	int bpp;			// bits pro pixel

	TxU8 *data;			// Zeiger auf Pixeldaten (modulo = 0 )
	TxU32 *pal;			// Bei TXFMT_P_8,  Zeiger auf ein array mit 256 Elemente: pal[256]
	TxU8 *mask;			// Maske in width*height*1, pitch=width
};

typedef struct _texture s_texture;

int GetTxFMT_Bpp( TxFormat f);
int GetTxFMT_Bpp(s_texture* txTex);
int GetTxFMT_Size(s_texture* txTex);


inline int GetTxFMT_Bpp(s_texture* txTex)
{
	SYS_ASSERT_PTR(txTex);
	return GetTxFMT_Bpp(txTex->format);
}

inline int GetTxFMT_Bpp( TxFormat f)
{
	SYS_ASSERT( f >= 0 && f < TXFMT_UNKNOWN );
	
	if( f < TXFMT_RGB_555 )
	    return(1);
	if( f < TXFMT_RGB )
	    return(2);
	if( f < TXFMT_ARGB )
	    return(3);
	else
	    return(4);
}


inline int GetTxFMT_Size(s_texture* txTex)
{
	SYS_ASSERT_PTR(txTex);
	SYS_ASSERT( txTex->width >= 0 && txTex->width < 0xFFFF );	// Test auf Plausibilität
	SYS_ASSERT( txTex->height >= 0 && txTex->height < 0xFFFF ); // Test auf Plausibilität
	
	int size = txTex->width * txTex->height * GetTxFMT_Bpp(txTex->format);
	return(size);
}

//::12
// +----------------+
// |  txFmtAlloc()  |
// +----------------+

inline void txFmtAlloc( s_texture *txTex)
{
	SYS_ASSERT_PTR(txTex);
	
	txTex->size = GetTxFMT_Size(txTex);
	txTex->data = new TxU8 [txTex->size];
	txTex->pitch = txTex->width * GetTxFMT_Bpp(txTex);
	txTex->mask = 0;
	if( txTex->format == TXFMT_P_8 )
		txTex->pal = new TxU32 [256];	// Palette
}

//::16
// +---------------+
// |  txFmtFree()  |
// +---------------+

inline void txFmtFree( s_texture *txTex)
{
	SYS_ASSERT_PTR(txTex);
	
	delete txTex->data;
	txTex->data = 0;
	txTex->size = 0;

	if( txTex->format == TXFMT_P_8 )
	{
		delete txTex->pal;
		txTex->pal = 0;
	}
	
	delete txTex->mask;
	txTex->mask = 0;
}

#endif  							 // LLGFX_STEXTURE_INCLUDED