DirectDrawSurface.cpp

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/*
 * ***** BEGIN GPL LICENSE BLOCK *****
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 * Contributors: Amorilia (amorilia@users.sourceforge.net)
 *
 * ***** END GPL LICENSE BLOCK *****
 */

/*
 * This file is based on a similar file from the NVIDIA texture tools
 * (http://nvidia-texture-tools.googlecode.com/)
 *
 * Original license from NVIDIA follows.
 */

// Copyright NVIDIA Corporation 2007 -- Ignacio Castano <icastano@nvidia.com>
// 
// Permission is hereby granted, free of charge, to any person
// obtaining a copy of this software and associated documentation
// files (the "Software"), to deal in the Software without
// restriction, including without limitation the rights to use,
// copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following
// conditions:
// 
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
// HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
// WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
// OTHER DEALINGS IN THE SOFTWARE.

#include <DirectDrawSurface.h>
#include <BlockDXT.h>
#include <PixelFormat.h>

#include <stdio.h> // printf
#include <math.h>  // sqrt
#include <sys/types.h>

/*** declarations ***/

#if !defined(MAKEFOURCC)
#   define MAKEFOURCC(ch0, ch1, ch2, ch3) \
    (uint(uint8(ch0)) | (uint(uint8(ch1)) << 8) | \
    (uint(uint8(ch2)) << 16) | (uint(uint8(ch3)) << 24 ))
#endif

static const uint FOURCC_NVTT = MAKEFOURCC('N', 'V', 'T', 'T');
static const uint FOURCC_DDS = MAKEFOURCC('D', 'D', 'S', ' ');
static const uint FOURCC_DXT1 = MAKEFOURCC('D', 'X', 'T', '1');
static const uint FOURCC_DXT2 = MAKEFOURCC('D', 'X', 'T', '2');
static const uint FOURCC_DXT3 = MAKEFOURCC('D', 'X', 'T', '3');
static const uint FOURCC_DXT4 = MAKEFOURCC('D', 'X', 'T', '4');
static const uint FOURCC_DXT5 = MAKEFOURCC('D', 'X', 'T', '5');
static const uint FOURCC_RXGB = MAKEFOURCC('R', 'X', 'G', 'B');
static const uint FOURCC_ATI1 = MAKEFOURCC('A', 'T', 'I', '1');
static const uint FOURCC_ATI2 = MAKEFOURCC('A', 'T', 'I', '2');

static const uint FOURCC_A2XY = MAKEFOURCC('A', '2', 'X', 'Y');
    
static const uint FOURCC_DX10 = MAKEFOURCC('D', 'X', '1', '0');

static const uint FOURCC_UVER = MAKEFOURCC('U', 'V', 'E', 'R');

// 32 bit RGB formats.
static const uint D3DFMT_R8G8B8 = 20;
static const uint D3DFMT_A8R8G8B8 = 21;
static const uint D3DFMT_X8R8G8B8 = 22;
static const uint D3DFMT_R5G6B5 = 23;
static const uint D3DFMT_X1R5G5B5 = 24;
static const uint D3DFMT_A1R5G5B5 = 25;
static const uint D3DFMT_A4R4G4B4 = 26;
static const uint D3DFMT_R3G3B2 = 27;
static const uint D3DFMT_A8 = 28;
static const uint D3DFMT_A8R3G3B2 = 29;
static const uint D3DFMT_X4R4G4B4 = 30;
static const uint D3DFMT_A2B10G10R10 = 31;
static const uint D3DFMT_A8B8G8R8 = 32;
static const uint D3DFMT_X8B8G8R8 = 33;
static const uint D3DFMT_G16R16 = 34;
static const uint D3DFMT_A2R10G10B10 = 35;

static const uint D3DFMT_A16B16G16R16 = 36;

// Palette formats.
static const uint D3DFMT_A8P8 = 40;
static const uint D3DFMT_P8 = 41;
    
// Luminance formats.
static const uint D3DFMT_L8 = 50;
static const uint D3DFMT_A8L8 = 51;
static const uint D3DFMT_A4L4 = 52;
static const uint D3DFMT_L16 = 81;

// Floating point formats
static const uint D3DFMT_R16F = 111;
static const uint D3DFMT_G16R16F = 112;
static const uint D3DFMT_A16B16G16R16F = 113;
static const uint D3DFMT_R32F = 114;
static const uint D3DFMT_G32R32F = 115;
static const uint D3DFMT_A32B32G32R32F = 116;
    
static const uint DDSD_CAPS = 0x00000001U;
static const uint DDSD_PIXELFORMAT = 0x00001000U;
static const uint DDSD_WIDTH = 0x00000004U;
static const uint DDSD_HEIGHT = 0x00000002U;
static const uint DDSD_PITCH = 0x00000008U;
static const uint DDSD_MIPMAPCOUNT = 0x00020000U;
static const uint DDSD_LINEARSIZE = 0x00080000U;
static const uint DDSD_DEPTH = 0x00800000U;
    
static const uint DDSCAPS_COMPLEX = 0x00000008U;
static const uint DDSCAPS_TEXTURE = 0x00001000U;
static const uint DDSCAPS_MIPMAP = 0x00400000U;
static const uint DDSCAPS2_VOLUME = 0x00200000U;
static const uint DDSCAPS2_CUBEMAP = 0x00000200U;

static const uint DDSCAPS2_CUBEMAP_POSITIVEX = 0x00000400U;
static const uint DDSCAPS2_CUBEMAP_NEGATIVEX = 0x00000800U;
static const uint DDSCAPS2_CUBEMAP_POSITIVEY = 0x00001000U;
static const uint DDSCAPS2_CUBEMAP_NEGATIVEY = 0x00002000U;
static const uint DDSCAPS2_CUBEMAP_POSITIVEZ = 0x00004000U;
static const uint DDSCAPS2_CUBEMAP_NEGATIVEZ = 0x00008000U;
static const uint DDSCAPS2_CUBEMAP_ALL_FACES = 0x0000FC00U;

static const uint DDPF_ALPHAPIXELS = 0x00000001U;
static const uint DDPF_ALPHA = 0x00000002U;
static const uint DDPF_FOURCC = 0x00000004U;
static const uint DDPF_RGB = 0x00000040U;
static const uint DDPF_PALETTEINDEXED1 = 0x00000800U;
static const uint DDPF_PALETTEINDEXED2 = 0x00001000U;
static const uint DDPF_PALETTEINDEXED4 = 0x00000008U;
static const uint DDPF_PALETTEINDEXED8 = 0x00000020U;
static const uint DDPF_LUMINANCE = 0x00020000U;
static const uint DDPF_ALPHAPREMULT = 0x00008000U;

// Custom NVTT flags.
static const uint DDPF_NORMAL = 0x80000000U;  
static const uint DDPF_SRGB = 0x40000000U;

    // DX10 formats.
    enum DXGI_FORMAT
    {
        DXGI_FORMAT_UNKNOWN = 0,
        
        DXGI_FORMAT_R32G32B32A32_TYPELESS = 1,
        DXGI_FORMAT_R32G32B32A32_FLOAT = 2,
        DXGI_FORMAT_R32G32B32A32_UINT = 3,
        DXGI_FORMAT_R32G32B32A32_SINT = 4,
        
        DXGI_FORMAT_R32G32B32_TYPELESS = 5,
        DXGI_FORMAT_R32G32B32_FLOAT = 6,
        DXGI_FORMAT_R32G32B32_UINT = 7,
        DXGI_FORMAT_R32G32B32_SINT = 8,
        
        DXGI_FORMAT_R16G16B16A16_TYPELESS = 9,
        DXGI_FORMAT_R16G16B16A16_FLOAT = 10,
        DXGI_FORMAT_R16G16B16A16_UNORM = 11,
        DXGI_FORMAT_R16G16B16A16_UINT = 12,
        DXGI_FORMAT_R16G16B16A16_SNORM = 13,
        DXGI_FORMAT_R16G16B16A16_SINT = 14,
        
        DXGI_FORMAT_R32G32_TYPELESS = 15,
        DXGI_FORMAT_R32G32_FLOAT = 16,
        DXGI_FORMAT_R32G32_UINT = 17,
        DXGI_FORMAT_R32G32_SINT = 18,
        
        DXGI_FORMAT_R32G8X24_TYPELESS = 19,
        DXGI_FORMAT_D32_FLOAT_S8X24_UINT = 20,
        DXGI_FORMAT_R32_FLOAT_X8X24_TYPELESS = 21,
        DXGI_FORMAT_X32_TYPELESS_G8X24_UINT = 22,
        
        DXGI_FORMAT_R10G10B10A2_TYPELESS = 23,
        DXGI_FORMAT_R10G10B10A2_UNORM = 24,
        DXGI_FORMAT_R10G10B10A2_UINT = 25,
        
        DXGI_FORMAT_R11G11B10_FLOAT = 26,
        
        DXGI_FORMAT_R8G8B8A8_TYPELESS = 27,
        DXGI_FORMAT_R8G8B8A8_UNORM = 28,
        DXGI_FORMAT_R8G8B8A8_UNORM_SRGB = 29,
        DXGI_FORMAT_R8G8B8A8_UINT = 30,
        DXGI_FORMAT_R8G8B8A8_SNORM = 31,
        DXGI_FORMAT_R8G8B8A8_SINT = 32,
        
        DXGI_FORMAT_R16G16_TYPELESS = 33,
        DXGI_FORMAT_R16G16_FLOAT = 34,
        DXGI_FORMAT_R16G16_UNORM = 35,
        DXGI_FORMAT_R16G16_UINT = 36,
        DXGI_FORMAT_R16G16_SNORM = 37,
        DXGI_FORMAT_R16G16_SINT = 38,
        
        DXGI_FORMAT_R32_TYPELESS = 39,
        DXGI_FORMAT_D32_FLOAT = 40,
        DXGI_FORMAT_R32_FLOAT = 41,
        DXGI_FORMAT_R32_UINT = 42,
        DXGI_FORMAT_R32_SINT = 43,
        
        DXGI_FORMAT_R24G8_TYPELESS = 44,
        DXGI_FORMAT_D24_UNORM_S8_UINT = 45,
        DXGI_FORMAT_R24_UNORM_X8_TYPELESS = 46,
        DXGI_FORMAT_X24_TYPELESS_G8_UINT = 47,
        
        DXGI_FORMAT_R8G8_TYPELESS = 48,
        DXGI_FORMAT_R8G8_UNORM = 49,
        DXGI_FORMAT_R8G8_UINT = 50,
        DXGI_FORMAT_R8G8_SNORM = 51,
        DXGI_FORMAT_R8G8_SINT = 52,
        
        DXGI_FORMAT_R16_TYPELESS = 53,
        DXGI_FORMAT_R16_FLOAT = 54,
        DXGI_FORMAT_D16_UNORM = 55,
        DXGI_FORMAT_R16_UNORM = 56,
        DXGI_FORMAT_R16_UINT = 57,
        DXGI_FORMAT_R16_SNORM = 58,
        DXGI_FORMAT_R16_SINT = 59,
        
        DXGI_FORMAT_R8_TYPELESS = 60,
        DXGI_FORMAT_R8_UNORM = 61,
        DXGI_FORMAT_R8_UINT = 62,
        DXGI_FORMAT_R8_SNORM = 63,
        DXGI_FORMAT_R8_SINT = 64,
        DXGI_FORMAT_A8_UNORM = 65,
        
        DXGI_FORMAT_R1_UNORM = 66,
        
        DXGI_FORMAT_R9G9B9E5_SHAREDEXP = 67,
        
        DXGI_FORMAT_R8G8_B8G8_UNORM = 68,
        DXGI_FORMAT_G8R8_G8B8_UNORM = 69,
        
        DXGI_FORMAT_BC1_TYPELESS = 70,
        DXGI_FORMAT_BC1_UNORM = 71,
        DXGI_FORMAT_BC1_UNORM_SRGB = 72,
        
        DXGI_FORMAT_BC2_TYPELESS = 73,
        DXGI_FORMAT_BC2_UNORM = 74,
        DXGI_FORMAT_BC2_UNORM_SRGB = 75,
        
        DXGI_FORMAT_BC3_TYPELESS = 76,
        DXGI_FORMAT_BC3_UNORM = 77,
        DXGI_FORMAT_BC3_UNORM_SRGB = 78,
        
        DXGI_FORMAT_BC4_TYPELESS = 79,
        DXGI_FORMAT_BC4_UNORM = 80,
        DXGI_FORMAT_BC4_SNORM = 81,
        
        DXGI_FORMAT_BC5_TYPELESS = 82,
        DXGI_FORMAT_BC5_UNORM = 83,
        DXGI_FORMAT_BC5_SNORM = 84,
        
        DXGI_FORMAT_B5G6R5_UNORM = 85,
        DXGI_FORMAT_B5G5R5A1_UNORM = 86,
        DXGI_FORMAT_B8G8R8A8_UNORM = 87,
        DXGI_FORMAT_B8G8R8X8_UNORM = 88,

        DXGI_FORMAT_R10G10B10_XR_BIAS_A2_UNORM = 89,
        DXGI_FORMAT_B8G8R8A8_TYPELESS = 90,
        DXGI_FORMAT_B8G8R8A8_UNORM_SRGB = 91,
        DXGI_FORMAT_B8G8R8X8_TYPELESS = 92,
        DXGI_FORMAT_B8G8R8X8_UNORM_SRGB = 93,

        DXGI_FORMAT_BC6H_TYPELESS = 94,
        DXGI_FORMAT_BC6H_UF16 = 95,
        DXGI_FORMAT_BC6H_SF16 = 96,

        DXGI_FORMAT_BC7_TYPELESS = 97,
        DXGI_FORMAT_BC7_UNORM = 98,
        DXGI_FORMAT_BC7_UNORM_SRGB = 99,
    };

    enum D3D10_RESOURCE_DIMENSION
    {
        D3D10_RESOURCE_DIMENSION_UNKNOWN = 0,
        D3D10_RESOURCE_DIMENSION_BUFFER = 1,
        D3D10_RESOURCE_DIMENSION_TEXTURE1D = 2,
        D3D10_RESOURCE_DIMENSION_TEXTURE2D = 3,
        D3D10_RESOURCE_DIMENSION_TEXTURE3D = 4,
    };


    const char * getDxgiFormatString(DXGI_FORMAT dxgiFormat)
    {
#define CASE(format) case DXGI_FORMAT_##format: return #format
        switch(dxgiFormat)
        {
            CASE(UNKNOWN);
            
            CASE(R32G32B32A32_TYPELESS);
            CASE(R32G32B32A32_FLOAT);
            CASE(R32G32B32A32_UINT);
            CASE(R32G32B32A32_SINT);
            
            CASE(R32G32B32_TYPELESS);
            CASE(R32G32B32_FLOAT);
            CASE(R32G32B32_UINT);
            CASE(R32G32B32_SINT);
            
            CASE(R16G16B16A16_TYPELESS);
            CASE(R16G16B16A16_FLOAT);
            CASE(R16G16B16A16_UNORM);
            CASE(R16G16B16A16_UINT);
            CASE(R16G16B16A16_SNORM);
            CASE(R16G16B16A16_SINT);
            
            CASE(R32G32_TYPELESS);
            CASE(R32G32_FLOAT);
            CASE(R32G32_UINT);
            CASE(R32G32_SINT);
            
            CASE(R32G8X24_TYPELESS);
            CASE(D32_FLOAT_S8X24_UINT);
            CASE(R32_FLOAT_X8X24_TYPELESS);
            CASE(X32_TYPELESS_G8X24_UINT);
            
            CASE(R10G10B10A2_TYPELESS);
            CASE(R10G10B10A2_UNORM);
            CASE(R10G10B10A2_UINT);
            
            CASE(R11G11B10_FLOAT);
            
            CASE(R8G8B8A8_TYPELESS);
            CASE(R8G8B8A8_UNORM);
            CASE(R8G8B8A8_UNORM_SRGB);
            CASE(R8G8B8A8_UINT);
            CASE(R8G8B8A8_SNORM);
            CASE(R8G8B8A8_SINT);
            
            CASE(R16G16_TYPELESS);
            CASE(R16G16_FLOAT);
            CASE(R16G16_UNORM);
            CASE(R16G16_UINT);
            CASE(R16G16_SNORM);
            CASE(R16G16_SINT);
            
            CASE(R32_TYPELESS);
            CASE(D32_FLOAT);
            CASE(R32_FLOAT);
            CASE(R32_UINT);
            CASE(R32_SINT);
            
            CASE(R24G8_TYPELESS);
            CASE(D24_UNORM_S8_UINT);
            CASE(R24_UNORM_X8_TYPELESS);
            CASE(X24_TYPELESS_G8_UINT);
            
            CASE(R8G8_TYPELESS);
            CASE(R8G8_UNORM);
            CASE(R8G8_UINT);
            CASE(R8G8_SNORM);
            CASE(R8G8_SINT);
            
            CASE(R16_TYPELESS);
            CASE(R16_FLOAT);
            CASE(D16_UNORM);
            CASE(R16_UNORM);
            CASE(R16_UINT);
            CASE(R16_SNORM);
            CASE(R16_SINT);
            
            CASE(R8_TYPELESS);
            CASE(R8_UNORM);
            CASE(R8_UINT);
            CASE(R8_SNORM);
            CASE(R8_SINT);
            CASE(A8_UNORM);

            CASE(R1_UNORM);
        
            CASE(R9G9B9E5_SHAREDEXP);
            
            CASE(R8G8_B8G8_UNORM);
            CASE(G8R8_G8B8_UNORM);

            CASE(BC1_TYPELESS);
            CASE(BC1_UNORM);
            CASE(BC1_UNORM_SRGB);
        
            CASE(BC2_TYPELESS);
            CASE(BC2_UNORM);
            CASE(BC2_UNORM_SRGB);
        
            CASE(BC3_TYPELESS);
            CASE(BC3_UNORM);
            CASE(BC3_UNORM_SRGB);
        
            CASE(BC4_TYPELESS);
            CASE(BC4_UNORM);
            CASE(BC4_SNORM);
        
            CASE(BC5_TYPELESS);
            CASE(BC5_UNORM);
            CASE(BC5_SNORM);

            CASE(B5G6R5_UNORM);
            CASE(B5G5R5A1_UNORM);
            CASE(B8G8R8A8_UNORM);
            CASE(B8G8R8X8_UNORM);

            default: 
                return "UNKNOWN";
        }
#undef CASE
    }
    
    const char * getD3d10ResourceDimensionString(D3D10_RESOURCE_DIMENSION resourceDimension)
    {
        switch(resourceDimension)
        {
            default:
            case D3D10_RESOURCE_DIMENSION_UNKNOWN: return "UNKNOWN";
            case D3D10_RESOURCE_DIMENSION_BUFFER: return "BUFFER";
            case D3D10_RESOURCE_DIMENSION_TEXTURE1D: return "TEXTURE1D";
            case D3D10_RESOURCE_DIMENSION_TEXTURE2D: return "TEXTURE2D";
            case D3D10_RESOURCE_DIMENSION_TEXTURE3D: return "TEXTURE3D";
        }
    }

/*** implementation ***/

void mem_read(Stream & mem, DDSPixelFormat & pf)
{
    mem_read(mem, pf.size);
    mem_read(mem, pf.flags);
    mem_read(mem, pf.fourcc);
    mem_read(mem, pf.bitcount);
    mem_read(mem, pf.rmask);
    mem_read(mem, pf.gmask);
    mem_read(mem, pf.bmask);
    mem_read(mem, pf.amask);
}

void mem_read(Stream & mem, DDSCaps & caps)
{
    mem_read(mem, caps.caps1);
    mem_read(mem, caps.caps2);
    mem_read(mem, caps.caps3);
    mem_read(mem, caps.caps4);
}

void mem_read(Stream & mem, DDSHeader10 & header)
{
    mem_read(mem, header.dxgiFormat);
    mem_read(mem, header.resourceDimension);
    mem_read(mem, header.miscFlag);
    mem_read(mem, header.arraySize);
    mem_read(mem, header.reserved);
}

void mem_read(Stream & mem, DDSHeader & header)
{
    mem_read(mem, header.fourcc);
    mem_read(mem, header.size);
    mem_read(mem, header.flags);
    mem_read(mem, header.height);
    mem_read(mem, header.width);
    mem_read(mem, header.pitch);
    mem_read(mem, header.depth);
    mem_read(mem, header.mipmapcount);
    for (uint i = 0; i < 11; i++) mem_read(mem, header.reserved[i]);
    mem_read(mem, header.pf);
    mem_read(mem, header.caps);
    mem_read(mem, header.notused);

    if (header.hasDX10Header())
    {
        mem_read(mem, header.header10);
    }
}

namespace
{
    struct FormatDescriptor
    {
        uint format;
        uint bitcount;
        uint rmask;
        uint gmask;
        uint bmask;
        uint amask;
    };

    static const FormatDescriptor s_d3dFormats[] =
    {
        { D3DFMT_R8G8B8,        24, 0xFF0000,   0xFF00,     0xFF,       0 },
        { D3DFMT_A8R8G8B8,      32, 0xFF0000,   0xFF00,     0xFF,       0xFF000000 },  // DXGI_FORMAT_B8G8R8A8_UNORM
        { D3DFMT_X8R8G8B8,      32, 0xFF0000,   0xFF00,     0xFF,       0 },           // DXGI_FORMAT_B8G8R8X8_UNORM
        { D3DFMT_R5G6B5,        16, 0xF800,     0x7E0,      0x1F,       0 },           // DXGI_FORMAT_B5G6R5_UNORM
        { D3DFMT_X1R5G5B5,      16, 0x7C00,     0x3E0,      0x1F,       0 },
        { D3DFMT_A1R5G5B5,      16, 0x7C00,     0x3E0,      0x1F,       0x8000 },      // DXGI_FORMAT_B5G5R5A1_UNORM
        { D3DFMT_A4R4G4B4,      16, 0xF00,      0xF0,       0xF,        0xF000 },
        { D3DFMT_R3G3B2,        8,  0xE0,       0x1C,       0x3,        0 },
        { D3DFMT_A8,            8,  0,          0,          0,          8 },           // DXGI_FORMAT_A8_UNORM
        { D3DFMT_A8R3G3B2,      16, 0xE0,       0x1C,       0x3,        0xFF00 },
        { D3DFMT_X4R4G4B4,      16, 0xF00,      0xF0,       0xF,        0 },
        { D3DFMT_A2B10G10R10,   32, 0x3FF,      0xFFC00,    0x3FF00000, 0xC0000000 },  // DXGI_FORMAT_R10G10B10A2
        { D3DFMT_A8B8G8R8,      32, 0xFF,       0xFF00,     0xFF0000,   0xFF000000 },  // DXGI_FORMAT_R8G8B8A8_UNORM
        { D3DFMT_X8B8G8R8,      32, 0xFF,       0xFF00,     0xFF0000,   0 },
        { D3DFMT_G16R16,        32, 0xFFFF,     0xFFFF0000, 0,          0 },           // DXGI_FORMAT_R16G16_UNORM
        { D3DFMT_A2R10G10B10,   32, 0x3FF00000, 0xFFC00,    0x3FF,      0xC0000000 },
        { D3DFMT_A2B10G10R10,   32, 0x3FF,      0xFFC00,    0x3FF00000, 0xC0000000 },

        { D3DFMT_L8,            8,  8,          0,          0,          0 },           // DXGI_FORMAT_R8_UNORM 
        { D3DFMT_L16,           16, 16,         0,          0,          0 },           // DXGI_FORMAT_R16_UNORM
    };

    static const uint s_d3dFormatCount = sizeof(s_d3dFormats) / sizeof(s_d3dFormats[0]);

} // namespace

uint findD3D9Format(uint bitcount, uint rmask, uint gmask, uint bmask, uint amask)
{
    for (int i = 0; i < s_d3dFormatCount; i++)
        {
            if (s_d3dFormats[i].bitcount == bitcount &&
                s_d3dFormats[i].rmask == rmask &&
                s_d3dFormats[i].gmask == gmask &&
                s_d3dFormats[i].bmask == bmask &&
                s_d3dFormats[i].amask == amask)
            {
                return s_d3dFormats[i].format;
            }
        }

        return 0;
    }



DDSHeader::DDSHeader()
{
    this->fourcc = FOURCC_DDS;
    this->size = 124;
    this->flags  = (DDSD_CAPS|DDSD_PIXELFORMAT);
    this->height = 0;
    this->width = 0;
    this->pitch = 0;
    this->depth = 0;
    this->mipmapcount = 0;
    for (uint i = 0; i < 11; i++) this->reserved[i] = 0;

    // Store version information on the reserved header attributes.
    this->reserved[9] = FOURCC_NVTT;
    this->reserved[10] = (2 << 16) | (1 << 8) | (0);    // major.minor.revision

    this->pf.size = 32;
    this->pf.flags = 0;
    this->pf.fourcc = 0;
    this->pf.bitcount = 0;
    this->pf.rmask = 0;
    this->pf.gmask = 0;
    this->pf.bmask = 0;
    this->pf.amask = 0;
    this->caps.caps1 = DDSCAPS_TEXTURE;
    this->caps.caps2 = 0;
    this->caps.caps3 = 0;
    this->caps.caps4 = 0;
    this->notused = 0;

    this->header10.dxgiFormat = DXGI_FORMAT_UNKNOWN;
    this->header10.resourceDimension = D3D10_RESOURCE_DIMENSION_UNKNOWN;
    this->header10.miscFlag = 0;
    this->header10.arraySize = 0;
    this->header10.reserved = 0;
}

void DDSHeader::setWidth(uint w)
{
    this->flags |= DDSD_WIDTH;
    this->width = w;
}

void DDSHeader::setHeight(uint h)
{
    this->flags |= DDSD_HEIGHT;
    this->height = h;
}

void DDSHeader::setDepth(uint d)
{
    this->flags |= DDSD_DEPTH;
    this->depth = d;
}

void DDSHeader::setMipmapCount(uint count)
{
    if (count == 0 || count == 1)
    {
        this->flags &= ~DDSD_MIPMAPCOUNT;
        this->mipmapcount = 1;

        if (this->caps.caps2 == 0) {
            this->caps.caps1 = DDSCAPS_TEXTURE;
        }
        else {
            this->caps.caps1 = DDSCAPS_TEXTURE | DDSCAPS_COMPLEX;
        }
    }
    else
    {
        this->flags |= DDSD_MIPMAPCOUNT;
        this->mipmapcount = count;

        this->caps.caps1 |= DDSCAPS_COMPLEX | DDSCAPS_MIPMAP;
    }
}

void DDSHeader::setTexture2D()
{
    this->header10.resourceDimension = D3D10_RESOURCE_DIMENSION_TEXTURE2D;
    this->header10.arraySize = 1;
}

void DDSHeader::setTexture3D()
{
    this->caps.caps2 = DDSCAPS2_VOLUME;

    this->header10.resourceDimension = D3D10_RESOURCE_DIMENSION_TEXTURE3D;
    this->header10.arraySize = 1;
}

void DDSHeader::setTextureCube()
{
    this->caps.caps1 |= DDSCAPS_COMPLEX;
    this->caps.caps2 = DDSCAPS2_CUBEMAP | DDSCAPS2_CUBEMAP_ALL_FACES;

    this->header10.resourceDimension = D3D10_RESOURCE_DIMENSION_TEXTURE2D;
    this->header10.arraySize = 6;
}

void DDSHeader::setLinearSize(uint size)
{
    this->flags &= ~DDSD_PITCH;
    this->flags |= DDSD_LINEARSIZE;
    this->pitch = size;
}

void DDSHeader::setPitch(uint pitch)
{
    this->flags &= ~DDSD_LINEARSIZE;
    this->flags |= DDSD_PITCH;
    this->pitch = pitch;
}

void DDSHeader::setFourCC(uint8 c0, uint8 c1, uint8 c2, uint8 c3)
{
    // set fourcc pixel format.
    this->pf.flags = DDPF_FOURCC;
    this->pf.fourcc = MAKEFOURCC(c0, c1, c2, c3);

    this->pf.bitcount = 0;
    this->pf.rmask = 0;
    this->pf.gmask = 0;
    this->pf.bmask = 0;
    this->pf.amask = 0;
}

void DDSHeader::setFormatCode(uint32 code)
{
    // set fourcc pixel format.
    this->pf.flags = DDPF_FOURCC;
    this->pf.fourcc = code;
    
    this->pf.bitcount = 0;
    this->pf.rmask = 0;
    this->pf.gmask = 0;
    this->pf.bmask = 0;
    this->pf.amask = 0;
}

void DDSHeader::setSwizzleCode(uint8 c0, uint8 c1, uint8 c2, uint8 c3)
{
    this->pf.bitcount = MAKEFOURCC(c0, c1, c2, c3);
}


void DDSHeader::setPixelFormat(uint bitcount, uint rmask, uint gmask, uint bmask, uint amask)
{
    // Make sure the masks are correct.
    if ((rmask & gmask) ||
        (rmask & bmask) ||
        (rmask & amask) ||
        (gmask & bmask) ||
        (gmask & amask) ||
        (bmask & amask)) {
        printf("DDS: bad RGBA masks, pixel format not set\n");
        return;
    }

    if (rmask != 0 || gmask != 0 || bmask != 0)
    {
        if (gmask == 0 && bmask == 0)
        {
            this->pf.flags = DDPF_LUMINANCE;
        }
        else
        {
            this->pf.flags = DDPF_RGB;
        }

        if (amask != 0) {
            this->pf.flags |= DDPF_ALPHAPIXELS;
        }
    }
    else if (amask != 0)
    {
        this->pf.flags |= DDPF_ALPHA;
    }

    if (bitcount == 0)
    {
        // Compute bit count from the masks.
        uint total = rmask | gmask | bmask | amask;
        while(total != 0) {
            bitcount++;
            total >>= 1;
        }
    }

    // D3DX functions do not like this:
    this->pf.fourcc = 0; //findD3D9Format(bitcount, rmask, gmask, bmask, amask);
    /*if (this->pf.fourcc) {
        this->pf.flags |= DDPF_FOURCC;
    }*/

    if (!(bitcount > 0 && bitcount <= 32)) {
        printf("DDS: bad bit count, pixel format not set\n");
        return;
    }
    this->pf.bitcount = bitcount;
    this->pf.rmask = rmask;
    this->pf.gmask = gmask;
    this->pf.bmask = bmask;
    this->pf.amask = amask;
}

void DDSHeader::setDX10Format(uint format)
{
    //this->pf.flags = 0;
    this->pf.fourcc = FOURCC_DX10;
    this->header10.dxgiFormat = format;
}

void DDSHeader::setNormalFlag(bool b)
{
    if (b) this->pf.flags |= DDPF_NORMAL;
    else this->pf.flags &= ~DDPF_NORMAL;
}

void DDSHeader::setSrgbFlag(bool b)
{
    if (b) this->pf.flags |= DDPF_SRGB;
    else this->pf.flags &= ~DDPF_SRGB;
}

void DDSHeader::setHasAlphaFlag(bool b)
{
    if (b) this->pf.flags |= DDPF_ALPHAPIXELS;
    else this->pf.flags &= ~DDPF_ALPHAPIXELS;
}

void DDSHeader::setUserVersion(int version)
{
    this->reserved[7] = FOURCC_UVER;
    this->reserved[8] = version;
}

/*
void DDSHeader::swapBytes()
{
    this->fourcc = POSH_LittleU32(this->fourcc);
    this->size = POSH_LittleU32(this->size);
    this->flags = POSH_LittleU32(this->flags);
    this->height = POSH_LittleU32(this->height);
    this->width = POSH_LittleU32(this->width);
    this->pitch = POSH_LittleU32(this->pitch);
    this->depth = POSH_LittleU32(this->depth);
    this->mipmapcount = POSH_LittleU32(this->mipmapcount);
    
    for(int i = 0; i < 11; i++) {
        this->reserved[i] = POSH_LittleU32(this->reserved[i]);
    }

    this->pf.size = POSH_LittleU32(this->pf.size);
    this->pf.flags = POSH_LittleU32(this->pf.flags);
    this->pf.fourcc = POSH_LittleU32(this->pf.fourcc);
    this->pf.bitcount = POSH_LittleU32(this->pf.bitcount);
    this->pf.rmask = POSH_LittleU32(this->pf.rmask);
    this->pf.gmask = POSH_LittleU32(this->pf.gmask);
    this->pf.bmask = POSH_LittleU32(this->pf.bmask);
    this->pf.amask = POSH_LittleU32(this->pf.amask);
    this->caps.caps1 = POSH_LittleU32(this->caps.caps1);
    this->caps.caps2 = POSH_LittleU32(this->caps.caps2);
    this->caps.caps3 = POSH_LittleU32(this->caps.caps3);
    this->caps.caps4 = POSH_LittleU32(this->caps.caps4);
    this->notused = POSH_LittleU32(this->notused);

    this->header10.dxgiFormat = POSH_LittleU32(this->header10.dxgiFormat);
    this->header10.resourceDimension = POSH_LittleU32(this->header10.resourceDimension);
    this->header10.miscFlag = POSH_LittleU32(this->header10.miscFlag);
    this->header10.arraySize = POSH_LittleU32(this->header10.arraySize);
    this->header10.reserved = POSH_LittleU32(this->header10.reserved);
}
*/

bool DDSHeader::hasDX10Header() const
{
    return this->pf.fourcc == FOURCC_DX10;
}

uint DDSHeader::signature() const
{
    return this->reserved[9];
}

uint DDSHeader::toolVersion() const
{
    return this->reserved[10];
}

uint DDSHeader::userVersion() const
{
    if (this->reserved[7] == FOURCC_UVER) {
        return this->reserved[8];
    }
    return 0;
}

bool DDSHeader::isNormalMap() const
{
    return (pf.flags & DDPF_NORMAL) != 0;
}

bool DDSHeader::isSrgb() const
{
    return (pf.flags & DDPF_SRGB) != 0;
}

bool DDSHeader::hasAlpha() const
{
    return (pf.flags & DDPF_ALPHAPIXELS) != 0;
}

uint DDSHeader::d3d9Format() const
{
    if (pf.flags & DDPF_FOURCC) {
        return pf.fourcc;
    }
    else {
        return findD3D9Format(pf.bitcount, pf.rmask, pf.gmask, pf.bmask, pf.amask);
    }
}

DirectDrawSurface::DirectDrawSurface(unsigned char *mem, uint size) : stream(mem, size), header()
{
    mem_read(stream, header);

    // some ATI2 compressed normal maps do not have their
    // normal flag set, so force it here (the original nvtt don't do
    // this, but the decompressor has a -forcenormal flag)
    if (header.pf.fourcc == FOURCC_ATI2) header.setNormalFlag(true);
}

DirectDrawSurface::~DirectDrawSurface()
{
}

bool DirectDrawSurface::isValid() const
{
    if (header.fourcc != FOURCC_DDS || header.size != 124)
    {
        return false;
    }
    
    const uint required = (DDSD_WIDTH|DDSD_HEIGHT/*|DDSD_CAPS|DDSD_PIXELFORMAT*/);
    if( (header.flags & required) != required ) {
        return false;
    }
    
    if (header.pf.size != 32) {
        return false;
    }

    /* in some files DDSCAPS_TEXTURE is missing: silently ignore */
    /*
    if( !(header.caps.caps1 & DDSCAPS_TEXTURE) ) {
        return false;
    }
    */

    return true;
}

bool DirectDrawSurface::isSupported() const
{
    if (header.hasDX10Header())
    {
        if (header.header10.dxgiFormat == DXGI_FORMAT_BC1_UNORM ||
            header.header10.dxgiFormat == DXGI_FORMAT_BC2_UNORM ||
            header.header10.dxgiFormat == DXGI_FORMAT_BC3_UNORM ||
            header.header10.dxgiFormat == DXGI_FORMAT_BC4_UNORM ||
            header.header10.dxgiFormat == DXGI_FORMAT_BC5_UNORM)
        {
            return true;
        }

        return false;
    }
    else
    {
        if (header.pf.flags & DDPF_FOURCC)
        {
            if (header.pf.fourcc != FOURCC_DXT1 &&
                header.pf.fourcc != FOURCC_DXT2 &&
                header.pf.fourcc != FOURCC_DXT3 &&
                header.pf.fourcc != FOURCC_DXT4 &&
                header.pf.fourcc != FOURCC_DXT5 &&
                header.pf.fourcc != FOURCC_RXGB &&
                header.pf.fourcc != FOURCC_ATI1 &&
                header.pf.fourcc != FOURCC_ATI2)
            {
                // Unknown fourcc code.
                return false;
            }
        }
        else if ((header.pf.flags & DDPF_RGB) || (header.pf.flags & DDPF_LUMINANCE))
        {
            // All RGB and luminance formats are supported now.
        }
        else
        {
            return false;
        }
        
        if (isTextureCube() && (header.caps.caps2 & DDSCAPS2_CUBEMAP_ALL_FACES) != DDSCAPS2_CUBEMAP_ALL_FACES)
        {
            // Cubemaps must contain all faces.
            return false;
        }
    
        if (isTexture3D())
        {
            // @@ 3D textures not supported yet.
            return false;
        }
    }
    
    return true;
}

bool DirectDrawSurface::hasAlpha() const
{
    if (header.hasDX10Header())
    {
        /* TODO: Update hasAlpha to handle all DX10 formats. */
        return 
            header.header10.dxgiFormat == DXGI_FORMAT_BC1_UNORM ||
            header.header10.dxgiFormat == DXGI_FORMAT_BC2_UNORM ||
            header.header10.dxgiFormat == DXGI_FORMAT_BC3_UNORM;
    }
    else
    {
        if (header.pf.flags & DDPF_RGB) 
        {
            return header.pf.amask != 0;
        }
        else if (header.pf.flags & DDPF_FOURCC)
        {
            if (header.pf.fourcc == FOURCC_RXGB ||
                header.pf.fourcc == FOURCC_ATI1 ||
                header.pf.fourcc == FOURCC_ATI2 ||
                header.pf.flags & DDPF_NORMAL)
            {
                return false;
            }
            else
            {
                // @@ Here we could check the ALPHA_PIXELS flag, but nobody sets it. (except us?)
                return true;
            }
        }

        return false;
    }
}

uint DirectDrawSurface::mipmapCount() const
{
    if (header.flags & DDSD_MIPMAPCOUNT) return header.mipmapcount;
    else return 1;
}


uint DirectDrawSurface::width() const
{
    if (header.flags & DDSD_WIDTH) return header.width;
    else return 1;
}

uint DirectDrawSurface::height() const
{
    if (header.flags & DDSD_HEIGHT) return header.height;
    else return 1;
}

uint DirectDrawSurface::depth() const
{
    if (header.flags & DDSD_DEPTH) return header.depth;
    else return 1;
}

bool DirectDrawSurface::isTexture1D() const
{
    if (header.hasDX10Header())
    {
        return header.header10.resourceDimension == D3D10_RESOURCE_DIMENSION_TEXTURE1D;
    }
    return false;
}

bool DirectDrawSurface::isTexture2D() const
{
    if (header.hasDX10Header())
    {
        return header.header10.resourceDimension == D3D10_RESOURCE_DIMENSION_TEXTURE2D;
    }
    else
    {
        return !isTexture3D() && !isTextureCube();
    }
}

bool DirectDrawSurface::isTexture3D() const
{
    if (header.hasDX10Header())
    {
        return header.header10.resourceDimension == D3D10_RESOURCE_DIMENSION_TEXTURE3D;
    }
    else
    {
    return (header.caps.caps2 & DDSCAPS2_VOLUME) != 0;
    }
}

bool DirectDrawSurface::isTextureCube() const
{
    return (header.caps.caps2 & DDSCAPS2_CUBEMAP) != 0;
}

void DirectDrawSurface::setNormalFlag(bool b)
{
    header.setNormalFlag(b);
}

void DirectDrawSurface::setHasAlphaFlag(bool b)
{
    header.setHasAlphaFlag(b);
}

void DirectDrawSurface::setUserVersion(int version)
{
    header.setUserVersion(version);
}

void DirectDrawSurface::mipmap(Image * img, uint face, uint mipmap)
{
    stream.seek(offset(face, mipmap));
    
    uint w = width();
    uint h = height();
    
    // Compute width and height.
    for (uint m = 0; m < mipmap; m++)
    {
        w = max(1U, w / 2);
        h = max(1U, h / 2);
    }
    
    img->allocate(w, h);
    
    if (hasAlpha())
    {
        img->setFormat(Image::Format_ARGB);
    }
    else
    {
        img->setFormat(Image::Format_RGB);
    }

    if (header.hasDX10Header())
    {
        // So far only block formats supported.
        readBlockImage(img);
    }
    else
    {
        if (header.pf.flags & DDPF_RGB) 
        {
            readLinearImage(img);
        }
        else if (header.pf.flags & DDPF_FOURCC)
        {
            readBlockImage(img);
        }
    }
}

void DirectDrawSurface::readLinearImage(Image * img)
{
    
    const uint w = img->width();
    const uint h = img->height();
    
    uint rshift, rsize;
    PixelFormat::maskShiftAndSize(header.pf.rmask, &rshift, &rsize);
    
    uint gshift, gsize;
    PixelFormat::maskShiftAndSize(header.pf.gmask, &gshift, &gsize);
    
    uint bshift, bsize;
    PixelFormat::maskShiftAndSize(header.pf.bmask, &bshift, &bsize);
    
    uint ashift, asize;
    PixelFormat::maskShiftAndSize(header.pf.amask, &ashift, &asize);

    uint byteCount = (header.pf.bitcount + 7) / 8;

    if (byteCount > 4)
    {
        /* just in case... we could have segfaults later on if byteCount > 4 */
        printf("DDS: bitcount too large");
        return;
    }

    // Read linear RGB images.
    for (uint y = 0; y < h; y++)
    {
        for (uint x = 0; x < w; x++)
        {
            uint c = 0;
            mem_read(stream, (unsigned char *)(&c), byteCount);

            Color32 pixel(0, 0, 0, 0xFF);
            pixel.r = PixelFormat::convert((c & header.pf.rmask) >> rshift, rsize, 8);
            pixel.g = PixelFormat::convert((c & header.pf.gmask) >> gshift, gsize, 8);
            pixel.b = PixelFormat::convert((c & header.pf.bmask) >> bshift, bsize, 8);
            pixel.a = PixelFormat::convert((c & header.pf.amask) >> ashift, asize, 8);

            img->pixel(x, y) = pixel;
        }
    }
}

void DirectDrawSurface::readBlockImage(Image * img)
{

    const uint w = img->width();
    const uint h = img->height();
    
    const uint bw = (w + 3) / 4;
    const uint bh = (h + 3) / 4;
    
    for (uint by = 0; by < bh; by++)
    {
        for (uint bx = 0; bx < bw; bx++)
        {
            ColorBlock block;
            
            // Read color block.
            readBlock(&block);
            
            // Write color block.
            for (uint y = 0; y < min(4U, h-4*by); y++)
            {
                for (uint x = 0; x < min(4U, w-4*bx); x++)
                {
                    img->pixel(4*bx+x, 4*by+y) = block.color(x, y);
                }
            }
        }
    }
}

static Color32 buildNormal(uint8 x, uint8 y)
{
    float nx = 2 * (x / 255.0f) - 1;
    float ny = 2 * (y / 255.0f) - 1;
    float nz = 0.0f;
    if (1 - nx*nx - ny*ny > 0) nz = sqrt(1 - nx*nx - ny*ny);
    uint8 z = clamp(int(255.0f * (nz + 1) / 2.0f), 0, 255);
    
    return Color32(x, y, z);
}


void DirectDrawSurface::readBlock(ColorBlock * rgba)
{
    uint fourcc = header.pf.fourcc;

    // Map DX10 block formats to fourcc codes.
    if (header.hasDX10Header())
    {
        if (header.header10.dxgiFormat == DXGI_FORMAT_BC1_UNORM) fourcc = FOURCC_DXT1;
        if (header.header10.dxgiFormat == DXGI_FORMAT_BC2_UNORM) fourcc = FOURCC_DXT3;
        if (header.header10.dxgiFormat == DXGI_FORMAT_BC3_UNORM) fourcc = FOURCC_DXT5;
        if (header.header10.dxgiFormat == DXGI_FORMAT_BC4_UNORM) fourcc = FOURCC_ATI1;
        if (header.header10.dxgiFormat == DXGI_FORMAT_BC5_UNORM) fourcc = FOURCC_ATI2;
    }


    if (fourcc == FOURCC_DXT1)
    {
        BlockDXT1 block;
        mem_read(stream, block);
        block.decodeBlock(rgba);
    }
    else if (fourcc == FOURCC_DXT2 ||
        header.pf.fourcc == FOURCC_DXT3)
    {
        BlockDXT3 block;
        mem_read(stream, block);
        block.decodeBlock(rgba);
    }
    else if (fourcc == FOURCC_DXT4 ||
        header.pf.fourcc == FOURCC_DXT5 ||
        header.pf.fourcc == FOURCC_RXGB)
    {
        BlockDXT5 block;
        mem_read(stream, block);
        block.decodeBlock(rgba);
        
        if (fourcc == FOURCC_RXGB)
        {
            // Swap R & A.
            for (int i = 0; i < 16; i++)
            {
                Color32 & c = rgba->color(i);
                uint tmp = c.r;
                c.r = c.a;
                c.a = tmp;
            }
        }
    }
    else if (fourcc == FOURCC_ATI1)
    {
        BlockATI1 block;
        mem_read(stream, block);
        block.decodeBlock(rgba);
    }
    else if (fourcc == FOURCC_ATI2)
    {
        BlockATI2 block;
        mem_read(stream, block);
        block.decodeBlock(rgba);
    }
    
    // If normal flag set, convert to normal.
    if (header.pf.flags & DDPF_NORMAL)
    {
        if (fourcc == FOURCC_ATI2)
        {
            for (int i = 0; i < 16; i++)
            {
                Color32 & c = rgba->color(i);
                c = buildNormal(c.r, c.g);
            }
        }
        else if (fourcc == FOURCC_DXT5)
        {
            for (int i = 0; i < 16; i++)
            {
                Color32 & c = rgba->color(i);
                c = buildNormal(c.a, c.g);
            }
        }
    }
}


uint DirectDrawSurface::blockSize() const
{
    switch(header.pf.fourcc)
    {
        case FOURCC_DXT1:
        case FOURCC_ATI1:
            return 8;
        case FOURCC_DXT2:
        case FOURCC_DXT3:
        case FOURCC_DXT4:
        case FOURCC_DXT5:
        case FOURCC_RXGB:
        case FOURCC_ATI2:
            return 16;
        case FOURCC_DX10:
            switch(header.header10.dxgiFormat)
            {
                case DXGI_FORMAT_BC1_TYPELESS:
                case DXGI_FORMAT_BC1_UNORM:
                case DXGI_FORMAT_BC1_UNORM_SRGB:
                case DXGI_FORMAT_BC4_TYPELESS:
                case DXGI_FORMAT_BC4_UNORM:
                case DXGI_FORMAT_BC4_SNORM:
                    return 8;
                case DXGI_FORMAT_BC2_TYPELESS:
                case DXGI_FORMAT_BC2_UNORM:
                case DXGI_FORMAT_BC2_UNORM_SRGB:
                case DXGI_FORMAT_BC3_TYPELESS:
                case DXGI_FORMAT_BC3_UNORM:
                case DXGI_FORMAT_BC3_UNORM_SRGB:
                case DXGI_FORMAT_BC5_TYPELESS:
                case DXGI_FORMAT_BC5_UNORM:
                case DXGI_FORMAT_BC5_SNORM:
                    return 16;
            };
    };

    // Not a block image.
    return 0;
}

uint DirectDrawSurface::mipmapSize(uint mipmap) const
{
    uint w = width();
    uint h = height();
    uint d = depth();
    
    for (uint m = 0; m < mipmap; m++)
    {
        w = max(1U, w / 2);
        h = max(1U, h / 2);
        d = max(1U, d / 2);
    }

    if (header.pf.flags & DDPF_FOURCC)
    {
        // @@ How are 3D textures aligned?
        w = (w + 3) / 4;
        h = (h + 3) / 4;
        return blockSize() * w * h;
    }
    else if (header.pf.flags & DDPF_RGB || (header.pf.flags & DDPF_LUMINANCE))
    {
        uint pitch = computePitch(w, header.pf.bitcount, 8); // Asuming 8 bit alignment, which is the same D3DX expects.
    
        return pitch * h * d;
    }
    else {
        printf("DDS: mipmap format not supported\n");
        return(0);
    };
}

uint DirectDrawSurface::faceSize() const
{
    const uint count = mipmapCount();
    uint size = 0;
    
    for (uint m = 0; m < count; m++)
    {
        size += mipmapSize(m);
    }
    
    return size;
}

uint DirectDrawSurface::offset(const uint face, const uint mipmap)
{
    uint size = 128; // sizeof(DDSHeader);
    
    if (header.hasDX10Header())
    {
        size += 20; // sizeof(DDSHeader10);
    }

    if (face != 0)
    {
        size += face * faceSize();
    }
    
    for (uint m = 0; m < mipmap; m++)
    {
        size += mipmapSize(m);
    }
    
    return size;
}


void DirectDrawSurface::printInfo() const
{
    printf("Flags: 0x%.8X\n", header.flags);
    if (header.flags & DDSD_CAPS) printf("\tDDSD_CAPS\n");
    if (header.flags & DDSD_PIXELFORMAT) printf("\tDDSD_PIXELFORMAT\n");
    if (header.flags & DDSD_WIDTH) printf("\tDDSD_WIDTH\n");
    if (header.flags & DDSD_HEIGHT) printf("\tDDSD_HEIGHT\n");
    if (header.flags & DDSD_DEPTH) printf("\tDDSD_DEPTH\n");
    if (header.flags & DDSD_PITCH) printf("\tDDSD_PITCH\n");
    if (header.flags & DDSD_LINEARSIZE) printf("\tDDSD_LINEARSIZE\n");
    if (header.flags & DDSD_MIPMAPCOUNT) printf("\tDDSD_MIPMAPCOUNT\n");

    printf("Height: %u\n", header.height);
    printf("Width: %u\n", header.width);
    printf("Depth: %u\n", header.depth);
    if (header.flags & DDSD_PITCH) printf("Pitch: %u\n", header.pitch);
    else if (header.flags & DDSD_LINEARSIZE) printf("Linear size: %u\n", header.pitch);
    printf("Mipmap count: %u\n", header.mipmapcount);
    
    printf("Pixel Format:\n");
    printf("\tFlags: 0x%.8X\n", header.pf.flags);
    if (header.pf.flags & DDPF_RGB) printf("\t\tDDPF_RGB\n");
    if (header.pf.flags & DDPF_LUMINANCE) printf("\t\tDDPF_LUMINANCE\n");
    if (header.pf.flags & DDPF_FOURCC) printf("\t\tDDPF_FOURCC\n");
    if (header.pf.flags & DDPF_ALPHAPIXELS) printf("\t\tDDPF_ALPHAPIXELS\n");
    if (header.pf.flags & DDPF_ALPHA) printf("\t\tDDPF_ALPHA\n");
    if (header.pf.flags & DDPF_PALETTEINDEXED1) printf("\t\tDDPF_PALETTEINDEXED1\n");
    if (header.pf.flags & DDPF_PALETTEINDEXED2) printf("\t\tDDPF_PALETTEINDEXED2\n");
    if (header.pf.flags & DDPF_PALETTEINDEXED4) printf("\t\tDDPF_PALETTEINDEXED4\n");
    if (header.pf.flags & DDPF_PALETTEINDEXED8) printf("\t\tDDPF_PALETTEINDEXED8\n");
    if (header.pf.flags & DDPF_ALPHAPREMULT) printf("\t\tDDPF_ALPHAPREMULT\n");
    if (header.pf.flags & DDPF_NORMAL) printf("\t\tDDPF_NORMAL\n");
    
    if (header.pf.fourcc != 0) { 
        // Display fourcc code even when DDPF_FOURCC flag not set.
        printf("\tFourCC: '%c%c%c%c' (0x%.8X)\n",
            ((header.pf.fourcc >> 0) & 0xFF),
            ((header.pf.fourcc >> 8) & 0xFF),
            ((header.pf.fourcc >> 16) & 0xFF),
            ((header.pf.fourcc >> 24) & 0xFF), 
            header.pf.fourcc);
    }

    if ((header.pf.flags & DDPF_FOURCC) && (header.pf.bitcount != 0))
    {
        printf("\tSwizzle: '%c%c%c%c' (0x%.8X)\n", 
            (header.pf.bitcount >> 0) & 0xFF,
            (header.pf.bitcount >> 8) & 0xFF,
            (header.pf.bitcount >> 16) & 0xFF,
            (header.pf.bitcount >> 24) & 0xFF,
            header.pf.bitcount);
    }
    else
    {
        printf("\tBit count: %u\n", header.pf.bitcount);
    }

    printf("\tRed mask: 0x%.8X\n", header.pf.rmask);
    printf("\tGreen mask: 0x%.8X\n", header.pf.gmask);
    printf("\tBlue mask: 0x%.8X\n", header.pf.bmask);
    printf("\tAlpha mask: 0x%.8X\n", header.pf.amask);

    printf("Caps:\n");
    printf("\tCaps 1: 0x%.8X\n", header.caps.caps1);
    if (header.caps.caps1 & DDSCAPS_COMPLEX) printf("\t\tDDSCAPS_COMPLEX\n");
    if (header.caps.caps1 & DDSCAPS_TEXTURE) printf("\t\tDDSCAPS_TEXTURE\n");
    if (header.caps.caps1 & DDSCAPS_MIPMAP) printf("\t\tDDSCAPS_MIPMAP\n");

    printf("\tCaps 2: 0x%.8X\n", header.caps.caps2);
    if (header.caps.caps2 & DDSCAPS2_VOLUME) printf("\t\tDDSCAPS2_VOLUME\n");
    else if (header.caps.caps2 & DDSCAPS2_CUBEMAP)
    {
        printf("\t\tDDSCAPS2_CUBEMAP\n");
        if ((header.caps.caps2 & DDSCAPS2_CUBEMAP_ALL_FACES) == DDSCAPS2_CUBEMAP_ALL_FACES) printf("\t\tDDSCAPS2_CUBEMAP_ALL_FACES\n");
        else {
            if (header.caps.caps2 & DDSCAPS2_CUBEMAP_POSITIVEX) printf("\t\tDDSCAPS2_CUBEMAP_POSITIVEX\n");
            if (header.caps.caps2 & DDSCAPS2_CUBEMAP_NEGATIVEX) printf("\t\tDDSCAPS2_CUBEMAP_NEGATIVEX\n");
            if (header.caps.caps2 & DDSCAPS2_CUBEMAP_POSITIVEY) printf("\t\tDDSCAPS2_CUBEMAP_POSITIVEY\n");
            if (header.caps.caps2 & DDSCAPS2_CUBEMAP_NEGATIVEY) printf("\t\tDDSCAPS2_CUBEMAP_NEGATIVEY\n");
            if (header.caps.caps2 & DDSCAPS2_CUBEMAP_POSITIVEZ) printf("\t\tDDSCAPS2_CUBEMAP_POSITIVEZ\n");
            if (header.caps.caps2 & DDSCAPS2_CUBEMAP_NEGATIVEZ) printf("\t\tDDSCAPS2_CUBEMAP_NEGATIVEZ\n");
        }
    }

    printf("\tCaps 3: 0x%.8X\n", header.caps.caps3);
    printf("\tCaps 4: 0x%.8X\n", header.caps.caps4);

    if (header.hasDX10Header())
    {
        printf("DX10 Header:\n");
        printf("\tDXGI Format: %u (%s)\n", header.header10.dxgiFormat, getDxgiFormatString((DXGI_FORMAT)header.header10.dxgiFormat));
        printf("\tResource dimension: %u (%s)\n", header.header10.resourceDimension, getD3d10ResourceDimensionString((D3D10_RESOURCE_DIMENSION)header.header10.resourceDimension));
        printf("\tMisc flag: %u\n", header.header10.miscFlag);
        printf("\tArray size: %u\n", header.header10.arraySize);
    }
    
    if (header.reserved[9] == FOURCC_NVTT)
    {
        int major = (header.reserved[10] >> 16) & 0xFF;
        int minor = (header.reserved[10] >> 8) & 0xFF;
        int revision= header.reserved[10] & 0xFF;
        
        printf("Version:\n");
        printf("\tNVIDIA Texture Tools %d.%d.%d\n", major, minor, revision);
    }

    if (header.reserved[7] == FOURCC_UVER)
    {
        printf("User Version: %u\n", header.reserved[8]);
    }
}