/**
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* MojoDDS; tools for dealing with DDS files.
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*
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* Please see the file LICENSE.txt in the source's root directory.
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*
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* This file written by Ryan C. Gordon.
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*/
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// Specs on DDS format: http://msdn.microsoft.com/en-us/library/bb943991.aspx/
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#ifdef _MSC_VER
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typedef unsigned __int8 uint8;
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typedef unsigned __int32 uint32;
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#else
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#include <stdint.h>
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typedef uint8_t uint8;
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typedef uint32_t uint32;
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#endif
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#define STATICARRAYLEN(x) ( (sizeof ((x))) / (sizeof ((x)[0])) )
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#define DDS_MAGIC 0x20534444 // 'DDS ' in littleendian.
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#define DDS_HEADERSIZE 124
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#define DDS_PIXFMTSIZE 32
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#define DDSD_CAPS 0x1
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#define DDSD_HEIGHT 0x2
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#define DDSD_WIDTH 0x4
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#define DDSD_PITCH 0x8
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#define DDSD_FMT 0x1000
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#define DDSD_MIPMAPCOUNT 0x20000
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#define DDSD_LINEARSIZE 0x80000
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#define DDSD_DEPTH 0x800000
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#define DDSD_REQ (DDSD_CAPS | DDSD_HEIGHT | DDSD_WIDTH | DDSD_FMT)
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#define DDSCAPS_COMPLEX 0x8
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#define DDSCAPS_MIPMAP 0x400000
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#define DDSCAPS_TEXTURE 0x1000
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#define DDPF_ALPHAPIXELS 0x1
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#define DDPF_ALPHA 0x2
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#define DDPF_FOURCC 0x4
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#define DDPF_RGB 0x40
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#define DDPF_YUV 0x200
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#define DDPF_LUMINANCE 0x20000
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#define FOURCC_DXT1 0x31545844
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#define FOURCC_DXT2 0x32545844
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#define FOURCC_DXT3 0x33545844
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#define FOURCC_DXT4 0x34545844
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#define FOURCC_DXT5 0x35545844
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#define FOURCC_DX10 0x30315844
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typedef struct
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{
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uint32 dwSize;
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uint32 dwFlags;
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uint32 dwFourCC;
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uint32 dwRGBBitCount;
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uint32 dwRBitMask;
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uint32 dwGBitMask;
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uint32 dwBBitMask;
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uint32 dwABitMask;
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} MOJODDS_PixelFormat;
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typedef struct
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{
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uint32 dwSize;
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uint32 dwFlags;
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uint32 dwHeight;
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uint32 dwWidth;
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uint32 dwPitchOrLinearSize;
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uint32 dwDepth;
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uint32 dwMipMapCount;
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uint32 dwReserved1[11];
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MOJODDS_PixelFormat ddspf;
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uint32 dwCaps;
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uint32 dwCaps2;
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uint32 dwCaps3;
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uint32 dwCaps4;
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uint32 dwReserved2;
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} MOJODDS_Header;
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static uint32 readui32(const uint8 **_ptr, size_t *_len)
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{
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uint32 retval = 0;
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if (*_len < sizeof (retval))
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*_len = 0;
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else
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{
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const uint8 *ptr = *_ptr;
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retval = (((uint32) ptr[0]) << 0) | (((uint32) ptr[1]) << 8) |
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(((uint32) ptr[2]) << 16) | (((uint32) ptr[3]) << 24) ;
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*_ptr += sizeof (retval);
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*_len -= sizeof (retval);
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} // else
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return retval;
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} // readui32
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static int parse_dds(MOJODDS_Header *header, const uint8 **ptr, size_t *len)
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{
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int i;
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// Files start with magic value...
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if (readui32(ptr, len) != DDS_MAGIC)
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return 0; // not a DDS file.
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// Then comes the DDS header...
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if (*len < DDS_HEADERSIZE)
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return 0;
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header->dwSize = readui32(ptr, len);
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header->dwFlags = readui32(ptr, len);
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header->dwHeight = readui32(ptr, len);
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header->dwWidth = readui32(ptr, len);
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header->dwPitchOrLinearSize = readui32(ptr, len);
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header->dwDepth = readui32(ptr, len);
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header->dwMipMapCount = readui32(ptr, len);
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for (i = 0; i < STATICARRAYLEN(header->dwReserved1); i++)
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header->dwReserved1[i] = readui32(ptr, len);
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header->ddspf.dwSize = readui32(ptr, len);
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header->ddspf.dwFlags = readui32(ptr, len);
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header->ddspf.dwFourCC = readui32(ptr, len);
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header->ddspf.dwRGBBitCount = readui32(ptr, len);
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header->ddspf.dwRBitMask = readui32(ptr, len);
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header->ddspf.dwGBitMask = readui32(ptr, len);
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header->ddspf.dwBBitMask = readui32(ptr, len);
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header->ddspf.dwABitMask = readui32(ptr, len);
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header->dwCaps = readui32(ptr, len);
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header->dwCaps2 = readui32(ptr, len);
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header->dwCaps3 = readui32(ptr, len);
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header->dwCaps4 = readui32(ptr, len);
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header->dwReserved2 = readui32(ptr, len);
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if (header->dwSize != DDS_HEADERSIZE) // header size must be 124.
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return 0;
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else if (header->ddspf.dwSize != DDS_PIXFMTSIZE) // size must be 32.
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return 0;
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else if ((header->dwFlags & DDSD_REQ) != DDSD_REQ) // must have these bits.
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return 0;
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else if (header->dwCaps != DDSCAPS_TEXTURE) // !!! FIXME
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return 0;
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else if (header->dwCaps2 != 0) // !!! FIXME (non-zero with other bits in dwCaps set)
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return 0;
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if ((header->ddspf.dwFlags & DDPF_FOURCC) == 0) // !!! FIXME
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return 0;
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if ((header->dwFlags & DDSD_LINEARSIZE) == 0) // !!! FIXME
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return 0;
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if (header->ddspf.dwFlags & DDPF_FOURCC)
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{
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switch (header->ddspf.dwFourCC)
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{
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case FOURCC_DXT1:
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case FOURCC_DXT2:
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case FOURCC_DXT3:
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case FOURCC_DXT4:
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case FOURCC_DXT5:
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// !!! FIXME: DX10 is an extended header, introduced by DirectX 10.
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//case FOURCC_DX10:
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break;
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default:
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return 0; // unsupported data format.
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} // switch
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} // if
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return 1;
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} // parse_dds
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// !!! FIXME: improve the crap out of this API later.
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int MOJODDS_getTexture(const void *_ptr, const unsigned long _len,
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const void **_tex, unsigned long *_texlen, int *_dxtver)
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{
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size_t len = (size_t) _len;
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const uint8 *ptr = (const uint8 *) _ptr;
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MOJODDS_Header header;
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if (!parse_dds(&header, &ptr, &len))
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return 0;
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*_tex = (const void *) ptr;
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*_texlen = (long) header.dwPitchOrLinearSize;
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switch (header.ddspf.dwFourCC)
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{
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case FOURCC_DXT1: *_dxtver = 1; break;
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case FOURCC_DXT2: *_dxtver = 2; break;
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case FOURCC_DXT3: *_dxtver = 3; break;
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case FOURCC_DXT4: *_dxtver = 4; break;
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case FOURCC_DXT5: *_dxtver = 5; break;
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default: *_dxtver = 0; return 0;
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} // switch
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return 1;
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} // MOJODDS_getTexture
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// end of mojodds.c ...
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