/// <summary>
/// Create the texture object for the native texture wrapped by the valid descriptor.
/// </summary>
/// <param name="descriptor">The texture descriptor wrapping a native texture object.</param>
/// <returns>
/// If the descriptor is valid, the <c>Texture</c> object created from the texture descriptor. Otherwise,
/// <c>null</c>.
/// </returns>
static Texture CreateTexture(XRTextureDescriptor descriptor)
{
if (!descriptor.valid)
{
return(null);
}
switch (descriptor.dimension)
{
#if UNITY_2020_2_OR_NEWER
case TextureDimension.Tex3D:
return(Texture3D.CreateExternalTexture(descriptor.width, descriptor.height,
descriptor.depth, descriptor.format,
(descriptor.mipmapCount != 0), descriptor.nativeTexture));
#endif
case TextureDimension.Tex2D:
var texture = Texture2D.CreateExternalTexture(descriptor.width, descriptor.height,
descriptor.format, (descriptor.mipmapCount != 0),
k_TextureHasLinearColorSpace,
descriptor.nativeTexture);
// NB: SetWrapMode needs to be the first call here, and the value passed
// needs to be kTexWrapClamp - this is due to limitations of what
// wrap modes are allowed for external textures in OpenGL (which are
// used for ARCore), as Texture::ApplySettings will eventually hit
// an assert about an invalid enum (see calls to glTexParameteri
// towards the top of ApiGLES::TextureSampler)
// reference: "3.7.14 External Textures" section of
// https://www.khronos.org/registry/OpenGL/extensions/OES/OES_EGL_image_external.txt
// (it shouldn't ever matter what the wrap mode is set to normally, since
// this is for a pass-through video texture, so we shouldn't ever need to
// worry about the wrap mode as textures should never "wrap")
texture.wrapMode = TextureWrapMode.Clamp;
texture.filterMode = FilterMode.Bilinear;
texture.hideFlags = HideFlags.HideAndDontSave;
return(texture);
case TextureDimension.Cube:
return(Cubemap.CreateExternalTexture(descriptor.width,
descriptor.format,
(descriptor.mipmapCount != 0),
descriptor.nativeTexture));
default:
return(null);
}
}
