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// Copyright (c) 1993-2023, 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 DDSWRITER_H
#define DDSWRITER_H
#include <fstream>
typedef int DWORD;
/// DDS File Structures
struct DDSPixelFormat {
DWORD Size;
DWORD Flags;
DWORD FourCC;
DWORD RGBBitCount;
DWORD RBitMask;
DWORD GBitMask;
DWORD BBitMask;
DWORD ABitMask;
};
struct DDSHeader {
DWORD Size;
DWORD Flags;
DWORD Height;
DWORD Width;
DWORD PitchOrLinearSize;
DWORD Depth;
DWORD MipMapCount;
DWORD Reserved1[11];
DDSPixelFormat PixelFormat;
DWORD Caps;
DWORD Caps2;
DWORD Caps3;
DWORD Caps4;
DWORD Reserved2;
};
#define DDPF_ALPHAPIXELS 0x1
#define DDPF_RGB 0x40
#define DDSD_CAPS 0x1
#define DDSD_HEIGHT 0x2
#define DDSD_WIDTH 0x4
#define DDSD_PIXELFORMAT 0x1000
#define DDSCAPS_TEXTURE 0x1000
/// WriteDDS - Writes image data to a .dds file. The data is expected to be
/// (R, G, B, A) tuples of 32-bit floating-point data of dimensions
/// width X height. The floating-point data should be normalized to [0,1] and
/// will be scaled to a [0, 255] 8-bit value.
void writeDDS(const char *filename, const float *data, unsigned width,
unsigned height) {
// Write out the result as a .dds file
// This is a quick and dirty DDS writer
DDSHeader header;
memset(&header, 0, sizeof(DDSHeader));
header.Size = sizeof(DDSHeader);
header.Flags = DDSD_CAPS | DDSD_HEIGHT | DDSD_WIDTH | DDSD_PIXELFORMAT;
header.Height = height;
header.Width = width;
header.PitchOrLinearSize = width*4;
header.Caps = DDSCAPS_TEXTURE;
header.PixelFormat.Size = sizeof(DDSPixelFormat);
header.PixelFormat.Flags = DDPF_RGB | DDPF_ALPHAPIXELS;
header.PixelFormat.RGBBitCount = 32;
header.PixelFormat.ABitMask = 0xFF000000;
header.PixelFormat.RBitMask = 0x00FF0000;
header.PixelFormat.GBitMask = 0x0000FF00;
header.PixelFormat.BBitMask = 0x000000FF;
std::ofstream str(filename, std::ios::binary);
int magic = 0x20534444;
str.write((const char*)&magic, 4);
str.write((const char*)&header, sizeof(header));
for(unsigned j = 0; j < height; ++j) {
for(unsigned i = 0; i < width; ++i) {
unsigned char r, g, b, a;
r = (unsigned char)(data[j*width*4+i*4+0] * 255.0);
g = (unsigned char)(data[j*width*4+i*4+1] * 255.0);
b = (unsigned char)(data[j*width*4+i*4+2] * 255.0);
a = (unsigned char)(data[j*width*4+i*4+3] * 255.0);
str.write((const char*)&b, 1);
str.write((const char*)&g, 1);
str.write((const char*)&r, 1);
str.write((const char*)&a, 1);
}
}
str.close();
}
#endif
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