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using System;
using System.Linq;
using UnityEngine;
#if UNITY_EDITOR
using UnityEditor;
#endif
namespace UniGLTF
{
public interface ITextureConverter
{
Texture2D GetImportTexture(Texture2D texture);
Texture2D GetExportTexture(Texture2D texture);
}
public static class TextureConverter
{
public delegate Color32 ColorConversion(Color32 color);
public static Texture2D Convert(Texture2D texture, glTFTextureTypes textureType, ColorConversion colorConversion, Material convertMaterial)
{
var copyTexture = TextureItem.CopyTexture(texture, TextureIO.GetColorSpace(textureType), convertMaterial);
if (colorConversion != null)
{
copyTexture.SetPixels32(copyTexture.GetPixels32().Select(x => colorConversion(x)).ToArray());
copyTexture.Apply();
}
copyTexture.name = texture.name;
return copyTexture;
}
public static void AppendTextureExtension(Texture texture, string extension)
{
if (!texture.name.EndsWith(extension))
{
texture.name = texture.name + extension;
}
}
public static void RemoveTextureExtension(Texture texture, string extension)
{
if (texture.name.EndsWith(extension))
{
texture.name = texture.name.Replace(extension, "");
}
}
}
public class MetallicRoughnessConverter : ITextureConverter
{
private const string m_extension = ".metallicRoughness";
private float _smoothnessOrRoughness;
public MetallicRoughnessConverter(float smoothnessOrRoughness)
{
_smoothnessOrRoughness = smoothnessOrRoughness;
}
public Texture2D GetImportTexture(Texture2D texture)
{
var converted = TextureConverter.Convert(texture, glTFTextureTypes.Metallic, Import, null);
TextureConverter.AppendTextureExtension(converted, m_extension);
return converted;
}
public Texture2D GetExportTexture(Texture2D texture)
{
var converted = TextureConverter.Convert(texture, glTFTextureTypes.Metallic, Export, null);
TextureConverter.RemoveTextureExtension(converted, m_extension);
return converted;
}
public Color32 Import(Color32 src)
{
// Roughness(glTF): dst.g -> Smoothness(Unity): src.a (with conversion)
// Metallic(glTF) : dst.b -> Metallic(Unity) : src.r
var pixelRoughnessFactor = (src.g * _smoothnessOrRoughness) / 255.0f; // roughness
var pixelSmoothness = 1.0f - Mathf.Sqrt(pixelRoughnessFactor);
return new Color32
{
r = src.b,
g = 0,
b = 0,
// Bake roughness values into a texture.
// See: https://github.com/dwango/UniVRM/issues/212.
a = (byte)Mathf.Clamp(pixelSmoothness * 255, 0, 255),
};
}
public Color32 Export(Color32 src)
{
// Smoothness(Unity): src.a -> Roughness(glTF): dst.g (with conversion)
// Metallic(Unity) : src.r -> Metallic(glTF) : dst.b
var pixelSmoothness = (src.a * _smoothnessOrRoughness) / 255.0f; // smoothness
// https://blogs.unity3d.com/jp/2016/01/25/ggx-in-unity-5-3/
var pixelRoughnessFactorSqrt = (1.0f - pixelSmoothness);
var pixelRoughnessFactor = pixelRoughnessFactorSqrt * pixelRoughnessFactorSqrt;
return new Color32
{
r = 0,
// Bake smoothness values into a texture.
// See: https://github.com/dwango/UniVRM/issues/212.
g = (byte)Mathf.Clamp(pixelRoughnessFactor * 255, 0, 255),
b = src.r,
a = 255,
};
}
}
public class NormalConverter : ITextureConverter
{
private const string m_extension = ".normal";
private Material m_decoder;
private Material GetDecoder()
{
if (m_decoder == null)
{
m_decoder = new Material(Shader.Find("UniGLTF/NormalMapDecoder"));
}
return m_decoder;
}
private Material m_encoder;
private Material GetEncoder()
{
if (m_encoder == null)
{
m_encoder = new Material(Shader.Find("UniGLTF/NormalMapEncoder"));
}
return m_encoder;
}
// GLTF data to Unity texture
// ConvertToNormalValueFromRawColorWhenCompressionIsRequired
public Texture2D GetImportTexture(Texture2D texture)
{
var mat = GetEncoder();
var converted = TextureConverter.Convert(texture, glTFTextureTypes.Normal, null, mat);
TextureConverter.AppendTextureExtension(converted, m_extension);
return converted;
}
// Unity texture to GLTF data
// ConvertToRawColorWhenNormalValueIsCompressed
public Texture2D GetExportTexture(Texture2D texture)
{
var mat = GetDecoder();
var converted = TextureConverter.Convert(texture, glTFTextureTypes.Normal, null, mat);
TextureConverter.RemoveTextureExtension(converted, m_extension);
return converted;
}
}
public class OcclusionConverter : ITextureConverter
{
private const string m_extension = ".occlusion";
public Texture2D GetImportTexture(Texture2D texture)
{
var converted = TextureConverter.Convert(texture, glTFTextureTypes.Occlusion, Import, null);
TextureConverter.AppendTextureExtension(converted, m_extension);
return converted;
}
public Texture2D GetExportTexture(Texture2D texture)
{
var converted = TextureConverter.Convert(texture, glTFTextureTypes.Occlusion, Export, null);
TextureConverter.RemoveTextureExtension(converted, m_extension);
return converted;
}
public Color32 Import(Color32 src)
{
return new Color32
{
r = 0,
g = src.r,
b = 0,
a = 255,
};
}
public Color32 Export(Color32 src)
{
return new Color32
{
r = src.g,
g = 0,
b = 0,
a = 255,
};
}
}
}
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