/*
#?RADIANCE
# Made with FreeImage 3.9.3
# FORMAT=32-bit_rle_rgbe
# GAMMA=1
# EXPOSURE=0
#
# -Y 800 +X 1600
*/
private Texture LoadHdrEnvironmentMap(string filename)
{
HdrFile hdrFile = HdrAssetImporter.ReadHdrFile(filename);
Pixel[] pixels = hdrFile.Colors;
byte[] bytes = new byte[pixels.Length * 4];
for (int i = 0; i < pixels.Length; i++)
{
//bytes[i * 4 + 0] = pixels[i].r;
//bytes[i * 4 + 1] = pixels[i].g;
//bytes[i * 4 + 2] = pixels[i].b;
//bytes[i * 4 + 3] = pixels[i].a;
}
var storage = new TexImage2D(TexImage2D.Target.Texture2D, GL.GL_RGB16F, hdrFile.Width, hdrFile.Height, GL.GL_RGBA, GL.GL_BYTE, new ArrayDataProvider <byte>(bytes));
var texture = new Texture(storage,
new TexParameteri(TexParameter.PropertyName.TextureWrapS, (int)GL.GL_CLAMP_TO_EDGE),
new TexParameteri(TexParameter.PropertyName.TextureWrapT, (int)GL.GL_CLAMP_TO_EDGE),
new TexParameteri(TexParameter.PropertyName.TextureMinFilter, (int)GL.GL_LINEAR),
new TexParameteri(TexParameter.PropertyName.TextureMagFilter, (int)GL.GL_LINEAR));
texture.Initialize();
var file = new FileInfo(filename);
texture.GetImage(hdrFile.Width, hdrFile.Height).Save(
string.Format("{0}.GetImage.png", file.Name));
return(texture);
}
public static HdrFile ReadHdrFile(string path)
{
if (!File.Exists(path))
{
throw new System.Exception("File does not exist");
}
var hdr = new HdrFile();
using (var stream = new FileStream(path, FileMode.Open))
{
using (var sr = new StreamReader(stream))
{
string header = sr.ReadLine().Trim();
if (header != "#?RADIANCE")
{
throw new System.Exception("File is not in Radiance HDR format.");
}
while (!sr.EndOfStream)
{
string line = sr.ReadLine();
if (line.StartsWith("FORMAT"))
{
switch (line.Substring(7))
{
case "32-bit_rle_rgbe":
hdr.format = HdrFile.Format.RGBE;
break;
case "32-bit_rle_xyze":
hdr.format = HdrFile.Format.XYZE;
throw new System.Exception("XYZE format is not supported.");
default:
throw new System.Exception("HDR file is of an unknown format.");
}
}
// end of header
if (line == string.Empty)
{
break;
}
}
// Read the dimensions
string[] size = sr.ReadLine().Split(' ');
// FIXME assuming that it's -Y +X layout
int width = int.Parse(size[1]);
int height = int.Parse(size[3]);
Pixel[] buffer = new Pixel[width * height];
hdr.SetDimensions(width, height);
var sb = new StringBuilder();
var lastColor = new Pixel(0, 0, 0, 0);
int cursor = 0;
while (cursor < buffer.Length)
{
byte[] rgbe = new byte[4];
stream.Read(rgbe, 0, 4);
if (width < 8 || width > 32767)
{
hdr.compression = HdrFile.Compression.Uncompressed;
}
else if (cursor == 0 && rgbe[0] == 2 && rgbe[1] == 2)
{
hdr.compression = HdrFile.Compression.AdaptiveRLE;
}
Pixel c = new Pixel(rgbe[0], rgbe[1], rgbe[2], rgbe[3]);
if (hdr.compression == HdrFile.Compression.AdaptiveRLE)
{
// TODO
}
else if (c.r == 255 && c.g == 255 && c.b == 255)
{
// Old run-length encoding
hdr.compression = HdrFile.Compression.RLE;
cursor++;
for (int i = 0; i < c.a; i++)
{
buffer[cursor] = lastColor;
cursor++;
}
}
else
{
buffer[cursor] = c;
}
lastColor = c;
cursor++;
}
hdr.Colors = buffer;
}
}
return(hdr);
}