private IMaterialAsset TransformMaterial(Material material, string id, ReaderContext context)
{
var materialAsset = new MaterialAsset(id);
materialAsset.AlphaCutoff = material.AlphaCutoff;
materialAsset.Alpha = GetAlphaMode(material.Alpha);
materialAsset.DoubleSided = material.DoubleSided;
materialAsset.Unlit = material.Unlit;
var shaderParameters = material.Channels.Select(_ => TransformShaderParameter(_, context)).SelectMany(_ => _)
.ToDictionary(_ => _.Key, _ => _);
var metallicRoughness = 0;
var specularGlossiness = 0;
foreach (var shaderParameter in shaderParameters)
{
switch (shaderParameter.Key)
{
case ShaderParameterKey.BaseColorFactor:
case ShaderParameterKey.BaseColorTexture:
case ShaderParameterKey.MetallicFactor:
case ShaderParameterKey.MetallicRoughnessTexture:
++metallicRoughness;
break;
case ShaderParameterKey.DiffuseFactor:
case ShaderParameterKey.DiffuseTexture:
case ShaderParameterKey.SpecularFactor:
case ShaderParameterKey.GlossinessFactor:
case ShaderParameterKey.SpecularGlossinessTexture:
++specularGlossiness;
break;
}
}
if (metallicRoughness > 0 && specularGlossiness == 0)
{
var shader = new MetallicRoughnessShader();
materialAsset.Shader = shader;
}
else if (metallicRoughness == 0 && specularGlossiness >= 0)
{
var shader = new SpecularGlossinessShader();
materialAsset.Shader = shader;
}
else
{
var shader = new ShaderAsset();
materialAsset.Shader = shader;
}
foreach (var shaderParameter in shaderParameters)
{
materialAsset.Shader.Set(shaderParameter.Value);
}
return(materialAsset);
}
private void SetupMetallicRoughnessShader(Material material, MetallicRoughnessShader shader, WriterContext context)
{
material = material.WithPBRMetallicRoughness();
SetupDefaultShader(material, shader, context);
TrySetupTexture(material, "BaseColor", shader.BaseColorTexture, context);
material.WithChannelParameter("BaseColor", shader.BaseColorFactor);
TrySetupTexture(material, "MetallicRoughness", shader.MetallicRoughnessTexture, context);
material.WithChannelParameter("MetallicRoughness", new Vector4(shader.MetallicFactor, shader.RoughnessFactor, 0, 0));
}