text: /* Copyright (c) 2021, NVIDIA CORPORATION. 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 name of NVIDIA CORPORATION 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 ``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.
   */
  
  #ifndef DDS_H
  #define DDS_H
  
  #if !defined(MAKEFOURCC)
  #define MAKEFOURCC(ch0, ch1, ch2, ch3)                \
    ((unsigned int)(ch0) | ((unsigned int)(ch1) << 8) | \
     ((unsigned int)(ch2) << 16) | ((unsigned int)(ch3) << 24))
  #endif
  
  typedef unsigned int uint;
  typedef unsigned short ushort;
  
  struct DDSPixelFormat {
    uint size;
    uint flags;
    uint fourcc;
    uint bitcount;
    uint rmask;
    uint gmask;
    uint bmask;
    uint amask;
  };
  
  struct DDSCaps {
    uint caps1;
    uint caps2;
    uint caps3;
    uint caps4;
  };
  
  /// DDS file header.
  struct DDSHeader {
    uint fourcc;
    uint size;
    uint flags;
    uint height;
    uint width;
    uint pitch;
    uint depth;
    uint mipmapcount;
    uint reserved[11];
    DDSPixelFormat pf;
    DDSCaps caps;
    uint notused;
  };
  
  static const uint FOURCC_DDS = MAKEFOURCC('D', 'D', 'S', ' ');
  static const uint FOURCC_DXT1 = MAKEFOURCC('D', 'X', 'T', '1');
  static const uint DDSD_WIDTH = 0x00000004U;
  static const uint DDSD_HEIGHT = 0x00000002U;
  static const uint DDSD_CAPS = 0x00000001U;
  static const uint DDSD_PIXELFORMAT = 0x00001000U;
  static const uint DDSCAPS_TEXTURE = 0x00001000U;
  static const uint DDPF_FOURCC = 0x00000004U;
  static const uint DDSD_LINEARSIZE = 0x00080000U;
  
  #endif  // DDS_H
  