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100 行
4.5 KiB
100 行
4.5 KiB
using System;
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using System.Linq;
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using UniGLTF;
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using UniJSON;
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using UnityEngine;
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using ColorSpace = VRMShaders.ColorSpace;
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namespace UniVRM10
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{
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internal static class MigrationPbrMaterial
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{
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private const string UsingGltfMaterialKeywordInVrmExtension = "VRM_USE_GLTFSHADER";
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private const string ExporterVersionKey = "exporterVersion";
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/// <summary>
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/// vanilla の gltf material を対象とする.
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/// KHR_materials_unlit 拡張や VRM.materialProperties で MToon を対象とするマテリアルは処理してはいけない。
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/// </summary>
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public static void Migrate(glTF gltf, JsonNode vrm0XExtension)
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{
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var needMigrationRoughnessTextureValueSquared = false;
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var needMigrationEmissiveFactorGamma = false;
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if (vrm0XExtension.TryGet(ExporterVersionKey, out var vrm0XVersionStringNode))
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{
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var vrm0XVersionString = vrm0XVersionStringNode.GetString();
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if (Vrm0XVersion.ParseVersion(vrm0XVersionString, out var vrm0XVersion))
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{
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needMigrationRoughnessTextureValueSquared = Vrm0XVersion.IsNewer(
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new Vrm0XVersion.Version
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{
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Major = 0,
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Minor = 69,
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Patch = 0,
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Pre = "",
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},
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vrm0XVersion
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);
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needMigrationEmissiveFactorGamma = Vrm0XVersion.IsNewer(
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new Vrm0XVersion.Version
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{
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Major = 0,
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Minor = 107,
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Patch = 0,
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Pre = "",
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},
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vrm0XVersion
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);
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}
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}
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for (var idx = 0; idx < gltf.materials.Count; ++idx)
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{
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MigrateMaterial(gltf, vrm0XExtension, idx, needMigrationRoughnessTextureValueSquared, needMigrationEmissiveFactorGamma);
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}
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}
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private static void MigrateMaterial(glTF gltf, JsonNode vrm0XExtension, int idx, bool needMigrationRoughnessTextureValueSquared, bool needMigrationEmissiveFactorGamma)
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{
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var src = gltf.materials[idx];
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var vrm0XMaterial = vrm0XExtension["materialProperties"][idx];
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// NOTE: ignore MToon
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if (MigrationMaterialUtil.GetShaderName(vrm0XMaterial) != UsingGltfMaterialKeywordInVrmExtension) return;
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// NOTE: ignore Unlit
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if (glTF_KHR_materials_unlit.IsEnable(src)) return;
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if (needMigrationRoughnessTextureValueSquared)
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{
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// NOTE: 非常に実装がめんどくさい、かつ刺さるシチュエーションがかなり少ないので放置.
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}
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if (needMigrationEmissiveFactorGamma && src.emissiveFactor != null && src.emissiveFactor.Length == 3)
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{
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var emissiveFactor = new Color(src.emissiveFactor[0], src.emissiveFactor[1], src.emissiveFactor[2]);
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if (UniGLTF.glTF_KHR_materials_emissive_strength.TryGet(src.extensions, out var emissiveStrength))
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{
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emissiveFactor *= emissiveStrength.emissiveStrength;
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}
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else if (UniGLTF.Extensions.VRMC_materials_hdr_emissiveMultiplier.GltfDeserializer.TryGet(src.extensions, out var ex))
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{
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if (ex.EmissiveMultiplier != null)
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{
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emissiveFactor *= ex.EmissiveMultiplier.Value;
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}
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}
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// NOTE: 新しい emissive_strength 拡張を書き込むため、拡張をまっさらにする
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var extensionsExport = new glTFExtensionExport();
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src.extensions = extensionsExport;
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var linearEmissiveFactor = emissiveFactor.linear;
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if (linearEmissiveFactor.maxColorComponent > 1)
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{
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var maxColorComponent = linearEmissiveFactor.maxColorComponent;
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linearEmissiveFactor /= maxColorComponent;
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UniGLTF.glTF_KHR_materials_emissive_strength.Serialize(ref src.extensions, maxColorComponent);
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}
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src.emissiveFactor = linearEmissiveFactor.ToFloat3(ColorSpace.Linear, ColorSpace.Linear);
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}
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}
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}
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}
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