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ddslib.h
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ddslib.h
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/* -----------------------------------------------------------------------------
DDS Library
Based on code from Nvidia's DDS example:
http://www.nvidia.com/object/dxtc_decompression_code.html
Copyright (c) 2003 Randy Reddig
All rights reserved.
Redistribution and use in source and binary forms, with or without modification,
are permitted provided that the following conditions are met:
Redistributions of source code must retain the above copyright notice, this list
of conditions and the following disclaimer.
Redistributions in binary form must reproduce the above copyright notice, this
list of conditions and the following disclaimer in the documentation and/or
other materials provided with the distribution.
Neither the names of the copyright holders nor the names of its contributors may
be used to endorse or promote products derived from this software without
specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
----------------------------------------------------------------------------- */
#pragma once
#include <cstdint>
#include <ostream>
/* dds definition */
enum ddsPF_t
{
DDS_PF_ARGB8888,
DDS_PF_DXT1,
DDS_PF_DXT2,
DDS_PF_DXT3,
DDS_PF_DXT4,
DDS_PF_DXT5,
DDS_PF_DXT5_RXGB, /* Doom 3's swizzled format */
DDS_PF_UNKNOWN
};
// greebo: General parameters which depend on the DDS format
/*struct DDSLoadInfo
{
unsigned int divSize = 4;
unsigned int blockBytes;
GLenum internalFormat;
};
DDSLoadInfo loadInfoDXT1 = {
8, GL_COMPRESSED_RGBA_S3TC_DXT1
};
DdsLoadInfo loadInfoDXT3 = {
16, GL_COMPRESSED_RGBA_S3TC_DXT3
};
DdsLoadInfo loadInfoDXT5 = {
16, GL_COMPRESSED_RGBA_S3TC_DXT5
};*/
/* 16bpp stuff */
#define DDS_LOW_5 0x001F;
#define DDS_MID_6 0x07E0;
#define DDS_HIGH_5 0xF800;
#define DDS_MID_555 0x03E0;
#define DDS_HI_555 0x7C00;
/* structures */
struct ddsColorKey_t
{
unsigned int colorSpaceLowValue;
unsigned int colorSpaceHighValue;
};
struct ddsCaps_t
{
unsigned int caps1;
unsigned int caps2;
unsigned int caps3;
unsigned int caps4;
};
struct ddsMultiSampleCaps_t
{
unsigned short flipMSTypes;
unsigned short bltMSTypes;
};
/// Flags for DDSPixelFormat
enum DDSPixelFormatFlags
{
DDPF_ALPHAPIXELS = 0x1,
DDPF_ALPHA = 0x2,
DDPF_FOURCC = 0x4,
DDPF_RGB = 0x40,
DDPF_YUV = 0x200,
DDPF_LUMINANCE = 0x20000
};
struct DDSPixelFormat
{
uint32_t size;
uint32_t flags;
uint8_t fourCC[4];
union
{
uint32_t rgbBitCount;
uint32_t yuvBitCount;
uint32_t zBufferBitDepth;
uint32_t alphaBitDepth;
uint32_t luminanceBitCount;
uint32_t bumpBitCount;
uint32_t privateFormatBitCount;
};
union
{
uint32_t rBitMask;
uint32_t yBitMask;
uint32_t stencilBitDepth;
uint32_t luminanceBitMask;
uint32_t bumpDuBitMask;
uint32_t operations;
};
union
{
uint32_t gBitMask;
uint32_t uBitMask;
uint32_t zBitMask;
uint32_t bumpDvBitMask;
ddsMultiSampleCaps_t multiSampleCaps;
};
union
{
uint32_t bBitMask;
uint32_t vBitMask;
uint32_t stencilBitMask;
uint32_t bumpLuminanceBitMask;
};
union
{
uint32_t rgbAlphaBitMask;
uint32_t yuvAlphaBitMask;
uint32_t luminanceAlphaBitMask;
uint32_t rgbZBitMask;
uint32_t yuvZBitMask;
};
};
// DDS header flags
#define DDSD_CAPS 0x00000001
#define DDSD_HEIGHT 0x00000002
#define DDSD_WIDTH 0x00000004
#define DDSD_PITCH 0x00000008
#define DDSD_PIXELFORMAT 0x00001000
#define DDSD_MIPMAPCOUNT 0x00020000
#define DDSD_LINEARSIZE 0x00080000
#define DDSD_DEPTH 0x00800000
struct DDSHeader
{
/* magic: 'dds ' */
char magic[ 4 ];
/* directdraw surface */
uint32_t size;
uint32_t flags;
uint32_t height;
uint32_t width;
union
{
int32_t pitch;
uint32_t linearSize;
};
uint32_t depth;
uint32_t mipMapCount;
uint32_t alphaBitDepth;
uint32_t reserved;
uint32_t surface;
union
{
ddsColorKey_t ckDestOverlay;
uint32_t emptyFaceColor;
};
ddsColorKey_t ckDestBlt;
ddsColorKey_t ckSrcOverlay;
ddsColorKey_t ckSrcBlt;
DDSPixelFormat pixelFormat;
ddsCaps_t ddsCaps;
uint32_t textureStage;
/// Test if a particular flag is set
bool testFlag(uint32_t flag) const
{
return (flags & flag) > 0;
}
/// Test if this DDSHeader represents a valid DDS image
bool isValid() const
{
return size == 124 // fixed size structure
&& pixelFormat.size == 32
&& testFlag(DDSD_CAPS) // required in every DDS file
&& testFlag(DDSD_HEIGHT) // required in every DDS file
&& testFlag(DDSD_WIDTH) // required in every DDS file
&& testFlag(DDSD_PIXELFORMAT); // required in every DDS file
}
/// Test if this DDS image is compressed (DXTx)
bool isCompressed() const
{
return pixelFormat.flags & DDPF_FOURCC;
}
/// Return the FOURCC compression format, if any
std::string getCompressionFormat() const
{
if (isCompressed())
// Return FOURCC as a string
return std::string(
reinterpret_cast<const char*>(&pixelFormat.fourCC[0]),
4
);
else
// Uncompressed, return nothing
return "";
}
/// Return number of RGB bits (uncompressed) or 0 (compressed)
int getRGBBits() const
{
if (!isCompressed() && (pixelFormat.flags & DDPF_RGB))
return pixelFormat.rgbBitCount;
else
return 0;
}
};
// Debug output for DDSHeader
std::ostream& operator<< (std::ostream& os, const DDSHeader& h);
struct ddsBuffer_t
{
DDSHeader header;
/* data (Varying size) */
unsigned char data[ 4 ];
};
/** greebo: This represents a 64 bit DDS block containing
* either the alpha or the colour data.
*/
struct ddsColorBlock_t
{
unsigned short colors[ 2 ];// 32 bit (2 x 16 bit)
unsigned char row[ 4 ]; // 32 bit (4 x 8 bit)
};
struct ddsAlphaBlockExplicit_t
{
unsigned short row[ 4 ];
};
struct ddsAlphaBlock3BitLinear_t
{
unsigned char alpha0;
unsigned char alpha1;
unsigned char stuff[ 6 ];
};
struct ddsColor_t
{
unsigned char r, g, b, a;
};
/* public functions */
int DDSGetInfo( const DDSHeader* header, int *width, int *height, ddsPF_t *pf );
int DDSDecompress( const DDSHeader* header, const unsigned char* buffer, unsigned char *pixels );