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//-----------------------------------------------------------------------------
//
// ImageLib Sources
// Copyright (C) 2000-2002 by Denton Woods
// Last modified: 02/21/2002 <--Y2K Compliant! =]
//
// Filename: src-IL/include/il_dds.h
//
// Description: Reads from a DirectDraw Surface (.dds) file.
//
//-----------------------------------------------------------------------------
#ifndef DDS_H
#define DDS_H
#include "il_internal.h"
#ifdef _WIN32
#pragma pack(push, dds_struct, 1)
#endif
typedef struct DDSHEAD
{
ILbyte Signature[4];
ILuint Size1; // size of the structure (minus MagicNum)
ILuint Flags1; // determines what fields are valid
ILuint Height; // height of surface to be created
ILuint Width; // width of input surface
ILuint LinearSize; // Formless late-allocated optimized surface size
ILuint Depth; // Depth if a volume texture
ILuint MipMapCount; // number of mip-map levels requested
ILuint AlphaBitDepth; // depth of alpha buffer requested
ILuint NotUsed[10];
ILuint Size2; // size of structure
ILuint Flags2; // pixel format flags
ILuint FourCC; // (FOURCC code)
ILuint RGBBitCount; // how many bits per pixel
ILuint RBitMask; // mask for red bit
ILuint GBitMask; // mask for green bits
ILuint BBitMask; // mask for blue bits
ILuint RGBAlphaBitMask; // mask for alpha channel
ILuint ddsCaps1, ddsCaps2, ddsCaps3, ddsCaps4; // direct draw surface capabilities
ILuint TextureStage;
} IL_PACKSTRUCT DDSHEAD;
#ifdef _WIN32
#pragma pack(pop, dds_struct)
#endif
// use cast to struct instead of RGBA_MAKE as struct is
// much
typedef struct Color8888
{
ILubyte r; // change the order of names to change the
ILubyte g; // order of the output ARGB or BGRA, etc...
ILubyte b; // Last one is MSB, 1st is LSB.
ILubyte a;
} Color8888;
typedef struct Color888
{
ILubyte r; // change the order of names to change the
ILubyte g; // order of the output ARGB or BGRA, etc...
ILubyte b; // Last one is MSB, 1st is LSB.
} Color888;
typedef struct Color565
{
unsigned nBlue : 5; // order of names changes
unsigned nGreen : 6; // byte order of output to 32 bit
unsigned nRed : 5;
} Color565;
typedef struct DXTColBlock
{
ILshort col0;
ILshort col1;
// no bit fields - use bytes
ILbyte row[4];
} DXTColBlock;
typedef struct DXTAlphaBlockExplicit
{
ILshort row[4];
} DXTAlphaBlockExplicit;
typedef struct DXTAlphaBlock3BitLinear
{
ILbyte alpha0;
ILbyte alpha1;
ILbyte stuff[6];
} DXTAlphaBlock3BitLinear;
// Defines
//Those 4 were added on 20040516 to make
//the written dds files more standard compliant
#define DDS_CAPS 0x00000001l
#define DDS_HEIGHT 0x00000002l
#define DDS_WIDTH 0x00000004l
#define DDS_PIXELFORMAT 0x00001000l
#define DDS_ALPHAPIXELS 0x00000001l
#define DDS_ALPHA 0x00000002l
#define DDS_FOURCC 0x00000004l
#define DDS_PITCH 0x00000008l
#define DDS_COMPLEX 0x00000008l
#define DDS_TEXTURE 0x00001000l
#define DDS_MIPMAPCOUNT 0x00020000l
#define DDS_LINEARSIZE 0x00080000l
#define DDS_VOLUME 0x00200000l
#define DDS_MIPMAP 0x00400000l
#define DDS_DEPTH 0x00800000l
#define DDS_CUBEMAP 0x00000200L
#define DDS_CUBEMAP_POSITIVEX 0x00000400L
#define DDS_CUBEMAP_NEGATIVEX 0x00000800L
#define DDS_CUBEMAP_POSITIVEY 0x00001000L
#define DDS_CUBEMAP_NEGATIVEY 0x00002000L
#define DDS_CUBEMAP_POSITIVEZ 0x00004000L
#define DDS_CUBEMAP_NEGATIVEZ 0x00008000L
#define IL_MAKEFOURCC(ch0, ch1, ch2, ch3) \
((ILint)(ILbyte)(ch0) | ((ILint)(ILbyte)(ch1) << 8) | \
((ILint)(ILbyte)(ch2) << 16) | ((ILint)(ILbyte)(ch3) << 24 ))
enum PixFormat
{
PF_ARGB,
PF_RGB,
PF_DXT1,
PF_DXT2,
PF_DXT3,
PF_DXT4,
PF_DXT5,
PF_3DC,
PF_UNKNOWN = 0xFF
};
// Global variables
extern DDSHEAD Head; // Image header
extern ILubyte *CompData; // Compressed data
extern ILuint CompSize; // Compressed size
extern ILuint CompLineSize; // Compressed line size
extern ILuint CompFormat; // Compressed format
extern ILimage *Image;
extern ILint Width, Height, Depth;
extern ILuint BlockSize;
#define CUBEMAP_SIDES 6
// Internal functions
ILboolean iLoadDdsInternal(ILvoid);
ILboolean iIsValidDds(ILvoid);
ILboolean iCheckDds(DDSHEAD *Head);
ILvoid AdjustVolumeTexture(DDSHEAD *Head);
ILboolean ReadData(ILvoid);
ILboolean AllocImage(ILvoid);
ILboolean Decompress(ILvoid);
ILboolean ReadMipmaps(ILvoid);
ILvoid DecodePixelFormat(ILvoid);
ILboolean DecompressARGB(ILvoid);
ILboolean DecompressDXT1(ILvoid);
ILboolean DecompressDXT2(ILvoid);
ILboolean DecompressDXT3(ILvoid);
ILboolean DecompressDXT4(ILvoid);
ILboolean DecompressDXT5(ILvoid);
ILboolean Decompress3Dc(ILvoid);
ILvoid CorrectPreMult(ILvoid);
ILvoid GetBitsFromMask(ILuint Mask, ILuint *ShiftLeft, ILuint *ShiftRight);
ILboolean iSaveDdsInternal(ILvoid);
ILboolean WriteHeader(ILimage *Image, ILenum DXTCFormat);
ILushort *CompressTo565(ILimage *Image);
ILubyte *CompressTo88(ILimage *Image);
ILuint Compress(ILimage *Image, ILenum DXTCFormat);
ILboolean GetBlock(ILushort *Block, ILushort *Data, ILimage *Image, ILuint XPos, ILuint YPos);
ILboolean GetAlphaBlock(ILubyte *Block, ILubyte *Data, ILimage *Image, ILuint XPos, ILuint YPos);
ILboolean Get3DcBlock(ILubyte *Block, ILubyte *Data, ILimage *Image, ILuint XPos, ILuint YPos, int channel);
ILvoid ShortToColor565(ILushort Pixel, Color565 *Colour);
ILvoid ShortToColor888(ILushort Pixel, Color888 *Colour);
ILushort Color565ToShort(Color565 *Colour);
ILushort Color888ToShort(Color888 *Colour);
ILuint GenBitMask(ILushort ex0, ILushort ex1, ILuint NumCols, ILushort *In, ILubyte *Alpha, Color888 *OutCol);
ILvoid GenAlphaBitMask(ILubyte a0, ILubyte a1, ILubyte *In, ILubyte *Mask, ILubyte *Out);
ILuint RMSAlpha(ILubyte *Orig, ILubyte *Test);
ILuint Distance(Color888 *c1, Color888 *c2);
ILvoid ChooseEndpoints(ILushort *Block, ILushort *ex0, ILushort *ex1);
ILvoid ChooseAlphaEndpoints(ILubyte *Block, ILubyte *a0, ILubyte *a1);
ILvoid CorrectEndDXT1(ILushort *ex0, ILushort *ex1, ILboolean HasAlpha);
ILvoid PreMult(ILushort *Data, ILubyte *Alpha);
#endif//DDS_H
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