TextureSamplerUtil.cs
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using System;
using System.Collections.Generic;
using UnityEngine;
namespace UniGLTF
{
public static class TextureSamplerUtil
{
#region WrapMode
public enum TextureWrapType
{
All,
#if UNITY_2017_1_OR_NEWER
U,
V,
W,
#endif
}
public static KeyValuePair<TextureWrapType, TextureWrapMode> TypeWithMode(TextureWrapType type, TextureWrapMode mode)
{
return new KeyValuePair<TextureWrapType, TextureWrapMode>(type, mode);
}
public static IEnumerable<KeyValuePair<TextureWrapType, TextureWrapMode>> GetUnityWrapMode(glTFTextureSampler sampler)
{
#if UNITY_2017_1_OR_NEWER
if (sampler.wrapS == sampler.wrapT)
{
switch (sampler.wrapS)
{
case glWrap.NONE: // default
yield return TypeWithMode(TextureWrapType.All, TextureWrapMode.Repeat);
break;
case glWrap.CLAMP_TO_EDGE:
yield return TypeWithMode(TextureWrapType.All, TextureWrapMode.Clamp);
break;
case glWrap.REPEAT:
yield return TypeWithMode(TextureWrapType.All, TextureWrapMode.Repeat);
break;
case glWrap.MIRRORED_REPEAT:
yield return TypeWithMode(TextureWrapType.All, TextureWrapMode.Mirror);
break;
default:
throw new NotImplementedException();
}
}
else
{
switch (sampler.wrapS)
{
case glWrap.NONE: // default
yield return TypeWithMode(TextureWrapType.U, TextureWrapMode.Repeat);
break;
case glWrap.CLAMP_TO_EDGE:
yield return TypeWithMode(TextureWrapType.U, TextureWrapMode.Clamp);
break;
case glWrap.REPEAT:
yield return TypeWithMode(TextureWrapType.U, TextureWrapMode.Repeat);
break;
case glWrap.MIRRORED_REPEAT:
yield return TypeWithMode(TextureWrapType.U, TextureWrapMode.Mirror);
break;
default:
throw new NotImplementedException();
}
switch (sampler.wrapT)
{
case glWrap.NONE: // default
yield return TypeWithMode(TextureWrapType.V, TextureWrapMode.Repeat);
break;
case glWrap.CLAMP_TO_EDGE:
yield return TypeWithMode(TextureWrapType.V, TextureWrapMode.Clamp);
break;
case glWrap.REPEAT:
yield return TypeWithMode(TextureWrapType.V, TextureWrapMode.Repeat);
break;
case glWrap.MIRRORED_REPEAT:
yield return TypeWithMode(TextureWrapType.V, TextureWrapMode.Mirror);
break;
default:
throw new NotImplementedException();
}
#else
// Unity2017.1より前
// * wrapSとwrapTの区別が無くてwrapしかない
// * Mirrorが無い
switch (sampler.wrapS)
{
case glWrap.NONE: // default
yield return TypeWithMode(TextureWrapType.All, TextureWrapMode.Repeat);
break;
case glWrap.CLAMP_TO_EDGE:
case glWrap.MIRRORED_REPEAT:
yield return TypeWithMode(TextureWrapType.All, TextureWrapMode.Clamp);
break;
case glWrap.REPEAT:
yield return TypeWithMode(TextureWrapType.All, TextureWrapMode.Repeat);
break;
default:
throw new NotImplementedException();
#endif
}
}
#endregion
public static FilterMode ImportFilterMode(glFilter filterMode)
{
switch (filterMode)
{
case glFilter.NEAREST:
case glFilter.NEAREST_MIPMAP_LINEAR:
case glFilter.NEAREST_MIPMAP_NEAREST:
return FilterMode.Point;
case glFilter.NONE:
case glFilter.LINEAR:
case glFilter.LINEAR_MIPMAP_NEAREST:
return FilterMode.Bilinear;
case glFilter.LINEAR_MIPMAP_LINEAR:
return FilterMode.Trilinear;
default:
throw new NotImplementedException();
}
}
public static void SetSampler(Texture2D texture, glTFTextureSampler sampler)
{
if (texture == null)
{
return;
}
foreach (var kv in GetUnityWrapMode(sampler))
{
switch (kv.Key)
{
case TextureWrapType.All:
texture.wrapMode = kv.Value;
break;
#if UNITY_2017_1_OR_NEWER
case TextureWrapType.U:
texture.wrapModeU = kv.Value;
break;
case TextureWrapType.V:
texture.wrapModeV = kv.Value;
break;
case TextureWrapType.W:
texture.wrapModeW = kv.Value;
break;
#endif
default:
throw new NotImplementedException();
}
}
texture.filterMode = ImportFilterMode(sampler.minFilter);
}
#region Export
public static glFilter ExportFilterMode(Texture texture)
{
switch (texture.filterMode)
{
case FilterMode.Point:
return glFilter.NEAREST;
case FilterMode.Bilinear:
return glFilter.LINEAR;
case FilterMode.Trilinear:
return glFilter.LINEAR_MIPMAP_LINEAR;
default:
throw new NotImplementedException();
}
}
public static TextureWrapMode GetWrapS(Texture texture)
{
#if UNITY_2017_1_OR_NEWER
return texture.wrapModeU;
#else
return texture.wrapMode;
#endif
}
public static TextureWrapMode GetWrapT(Texture texture)
{
#if UNITY_2017_1_OR_NEWER
return texture.wrapModeV;
#else
return texture.wrapMode;
#endif
}
public static glWrap ExportWrapMode(TextureWrapMode wrapMode)
{
switch (wrapMode)
{
case TextureWrapMode.Clamp:
return glWrap.CLAMP_TO_EDGE;
case (TextureWrapMode)(-1):
case TextureWrapMode.Repeat:
return glWrap.REPEAT;
#if UNITY_2017_1_OR_NEWER
case TextureWrapMode.Mirror:
case TextureWrapMode.MirrorOnce:
return glWrap.MIRRORED_REPEAT;
#endif
default:
throw new NotImplementedException();
}
}
public static glTFTextureSampler Export(Texture texture)
{
var filter = ExportFilterMode(texture);
var wrapS = ExportWrapMode(GetWrapS(texture));
var wrapT = ExportWrapMode(GetWrapT(texture));
return new glTFTextureSampler
{
magFilter = filter,
minFilter = filter,
wrapS = wrapS,
wrapT = wrapT,
};
}
#endregion
}
}