public static Texture2D LoadTextureOIIO(string filePath, bool isLinear)
{
// TODO: need to flip? Repere bottom left, Y-up
int ret = OIIOAPI.oiio_open_image(filePath);
if (ret == 0)
{
Debug.LogWarning("Could not open image " + filePath + " with OIIO.");
return(null);
}
int width = -1;
int height = -1;
int nchannels = -1;
OIIOAPI.BASETYPE format = OIIOAPI.BASETYPE.NONE;
ret = OIIOAPI.oiio_get_image_info(ref width, ref height, ref nchannels, ref format);
if (ret == 0)
{
Debug.LogWarning("Could not get info about image " + filePath + " with OIIO");
return(null);
}
TexConv conv = new TexConv();
bool canConvert = Format2Format(format, nchannels, ref conv);
if (!canConvert)
{
Debug.LogWarning("Could not create image from format: " + conv.format + " with option: " + conv.options);
return(CreateSmallImage());
}
// TMP
else if (conv.options.HasFlag(TextureConversionOptions.SHORT_TO_FLOAT) || conv.options.HasFlag(TextureConversionOptions.SHORT_TO_INT))
{
Debug.LogWarning("Could not create image from format: " + conv.format + " with option: " + conv.options);
return(CreateSmallImage());
}
Texture2D image = new Texture2D(width, height, conv.format, true, isLinear); // with mips
var pixels = image.GetRawTextureData();
GCHandle handle = GCHandle.Alloc(pixels, GCHandleType.Pinned);
ret = OIIOAPI.oiio_fill_image_data(handle.AddrOfPinnedObject(), conv.options.HasFlag(TextureConversionOptions.RGB_TO_RGBA) ? 1 : 0);
if (ret == 1)
{
image.LoadRawTextureData(pixels);
image.Apply();
}
else
{
Debug.LogWarning("Could not fill texture data of " + filePath + " with OIIO.");
return(null);
}
return(image);
}
private static bool Format2Format(OIIOAPI.BASETYPE format, int nchannels, ref TexConv result)
{
// TODO: handle compressed formats.
result.format = TextureFormat.RGBA32;
result.options = TextureConversionOptions.NO_CONV;
switch (format)
{
case OIIOAPI.BASETYPE.UCHAR:
case OIIOAPI.BASETYPE.CHAR:
switch (nchannels)
{
case 1: result.format = TextureFormat.R8; break;
case 2: result.format = TextureFormat.RG16; break;
case 3: result.format = TextureFormat.RGB24; break;
case 4: result.format = TextureFormat.RGBA32; break;
default: return(false);
}
break;
case OIIOAPI.BASETYPE.USHORT:
switch (nchannels)
{
case 1: result.format = TextureFormat.R16; break;
case 2: result.format = TextureFormat.RGFloat; result.options = TextureConversionOptions.SHORT_TO_FLOAT; break;
case 3: result.format = TextureFormat.RGBAFloat; result.options = TextureConversionOptions.SHORT_TO_FLOAT | TextureConversionOptions.RGB_TO_RGBA; break;
case 4: result.format = TextureFormat.RGBAFloat; result.options = TextureConversionOptions.SHORT_TO_FLOAT; break;
// R16_G16, R16_G16_B16 and R16_G16_B16_A16 do not exist
default: return(false);
}
break;
case OIIOAPI.BASETYPE.HALF:
switch (nchannels)
{
case 1: result.format = TextureFormat.RHalf; break;
case 2: result.format = TextureFormat.RGHalf; break;
case 3: result.format = TextureFormat.RGBAHalf; result.options = TextureConversionOptions.NO_CONV | TextureConversionOptions.RGB_TO_RGBA; break; // RGBHalf is NOT SUPPORTED
case 4: result.format = TextureFormat.RGBAHalf; break;
default: return(false);
}
break;
case OIIOAPI.BASETYPE.FLOAT:
switch (nchannels)
{
case 1: result.format = TextureFormat.RFloat; break;
case 2: result.format = TextureFormat.RGFloat; break;
case 3: result.format = TextureFormat.RGBAFloat; result.options = TextureConversionOptions.NO_CONV | TextureConversionOptions.RGB_TO_RGBA; break; // RGBFloat is NOT SUPPORTED
case 4: result.format = TextureFormat.RGBAFloat; break;
default: return(false);
}
break;
default: return(false);
}
return(true);
}
