// Monogame's BasicEffect uses Phong's shading, while glTF uses PBR shading, so
// given monogame's limitations, we try to guess the most appropiate values
// to have a reasonably good looking renders.
public Effect UseRigidEffect(Schema2.Material srcMaterial)
{
if (_Device == null)
{
throw new InvalidOperationException();
}
if (srcMaterial == null)
{
if (_DefaultRigid == null)
{
_DefaultRigid = new BasicEffect(_Device);
_Disposables.AddDisposable(_DefaultRigid);
}
return(_DefaultRigid);
}
if (_RigidEffects.TryGetValue(srcMaterial, out Effect dstMaterial))
{
return(dstMaterial);
}
dstMaterial = srcMaterial.Alpha == Schema2.AlphaMode.MASK ? CreateAlphaTestEffect(srcMaterial) : CreateBasicEffect(srcMaterial);
_RigidEffects[srcMaterial] = dstMaterial;
return(dstMaterial);
}
private Effect CreateBasicEffect(Schema2.Material srcMaterial)
{
var dstMaterial = new BasicEffect(_Device);
_Disposables.AddDisposable(dstMaterial);
dstMaterial.Name = srcMaterial.Name;
dstMaterial.Alpha = GetAlphaLevel(srcMaterial);
dstMaterial.DiffuseColor = GetDiffuseColor(srcMaterial);
dstMaterial.SpecularColor = GetSpecularColor(srcMaterial);
dstMaterial.SpecularPower = GetSpecularPower(srcMaterial);
dstMaterial.EmissiveColor = GeEmissiveColor(srcMaterial);
dstMaterial.Texture = GetDiffuseTexture(srcMaterial);
if (srcMaterial.Unlit)
{
dstMaterial.EmissiveColor = dstMaterial.DiffuseColor;
dstMaterial.SpecularColor = Vector3.Zero;
dstMaterial.SpecularPower = 16;
}
dstMaterial.PreferPerPixelLighting = true;
dstMaterial.TextureEnabled = dstMaterial.Texture != null;
return(dstMaterial);
}
private static Vector3 GeEmissiveColor(Schema2.Material srcMaterial)
{
var emissive = srcMaterial.FindChannel("Emissive");
if (emissive == null) return Vector3.Zero;
return new Vector3(emissive.Value.Parameter.X, emissive.Value.Parameter.Y, emissive.Value.Parameter.Z);
}
private static Vector3 GetDiffuseColor(Schema2.Material srcMaterial)
{
var diffuse = srcMaterial.FindChannel("Diffuse");
if (diffuse == null) diffuse = srcMaterial.FindChannel("BaseColor");
if (diffuse == null) return Vector3.One;
return new Vector3(diffuse.Value.Parameter.X, diffuse.Value.Parameter.Y, diffuse.Value.Parameter.Z);
}
private static float GetAlphaLevel(Schema2.Material srcMaterial)
{
if (srcMaterial.Alpha == Schema2.AlphaMode.OPAQUE) return 1;
var baseColor = srcMaterial.FindChannel("BaseColor");
if (baseColor == null) return 1;
return baseColor.Value.Parameter.W;
}
private static float GetSpecularPower(Schema2.Material srcMaterial)
{
var mr = srcMaterial.FindChannel("MetallicRoughness");
if (mr == null) return 16; // default value = 16
var metallic = mr.Value.Parameter.X;
var roughness = mr.Value.Parameter.Y;
return 4 + 16 * metallic;
}
private Texture2D GetDiffuseTexture(Schema2.Material srcMaterial)
{
var diffuse = srcMaterial.FindChannel("Diffuse");
if (diffuse == null) diffuse = srcMaterial.FindChannel("BaseColor");
if (diffuse == null) return null;
var name = srcMaterial.Name;
if (name == null) name = "null";
name += "-Diffuse";
return _TexFactory.UseTexture(diffuse.Value.Texture?.PrimaryImage?.GetImageContent() ?? default, name);
}
public Effect UseSkinnedEffect(Schema2.Material srcMaterial)
{
if (_Device == null)
{
throw new InvalidOperationException();
}
if (srcMaterial == null)
{
if (_DefaultSkinned == null)
{
_DefaultSkinned = new SkinnedEffect(_Device);
_Disposables.AddDisposable(_DefaultRigid);
}
return(_DefaultSkinned);
}
if (_SkinnedEffects.TryGetValue(srcMaterial, out SkinnedEffect dstMaterial))
{
return(dstMaterial);
}
dstMaterial = new SkinnedEffect(_Device);
_SkinnedEffects[srcMaterial] = dstMaterial;
_Disposables.AddDisposable(dstMaterial);
dstMaterial.Name = srcMaterial.Name;
dstMaterial.Alpha = GetAlphaLevel(srcMaterial);
dstMaterial.DiffuseColor = GetDiffuseColor(srcMaterial);
dstMaterial.SpecularColor = GetSpecularColor(srcMaterial);
dstMaterial.SpecularPower = GetSpecularPower(srcMaterial);
dstMaterial.EmissiveColor = GeEmissiveColor(srcMaterial);
dstMaterial.Texture = GetDiffuseTexture(srcMaterial);
dstMaterial.WeightsPerVertex = 4;
dstMaterial.PreferPerPixelLighting = true;
// apparently, SkinnedEffect does not support disabling textures, so we set a white texture here.
if (dstMaterial.Texture == null)
{
dstMaterial.Texture = _TexFactory.UseWhiteImage();
}
return(dstMaterial);
}
private static Vector3 GetSpecularColor(Schema2.Material srcMaterial)
{
var mr = srcMaterial.FindChannel("MetallicRoughness");
if (mr == null) return Vector3.One; // default value 16
var diffuse = GetDiffuseColor(srcMaterial);
var metallic = mr.Value.Parameter.X;
var roughness = mr.Value.Parameter.Y;
var k = Vector3.Zero;
k += Vector3.Lerp(diffuse, Vector3.Zero, roughness);
k += Vector3.Lerp(diffuse, Vector3.One, metallic);
k *= 0.5f;
return k;
}
private Effect CreateAlphaTestEffect(Schema2.Material srcMaterial)
{
var dstMaterial = new AlphaTestEffect(_Device);
_Disposables.AddDisposable(dstMaterial);
dstMaterial.Name = srcMaterial.Name;
dstMaterial.Alpha = GetAlphaLevel(srcMaterial);
//dstMaterial.AlphaFunction = CompareFunction.GreaterEqual;
dstMaterial.ReferenceAlpha = (int)(srcMaterial.AlphaCutoff * 255);
dstMaterial.DiffuseColor = GetDiffuseColor(srcMaterial);
dstMaterial.Texture = GetDiffuseTexture(srcMaterial);
return dstMaterial;
}
public Effect GetMaterial(Schema2.Material srcMaterial, bool isSkinned)
{
if (isSkinned)
{
if (_SkinnedEffects.TryGetValue(srcMaterial, out SkinnedEffect dstMaterial))
{
return(dstMaterial);
}
}
else
{
if (_RigidEffects.TryGetValue(srcMaterial, out Effect dstMaterial))
{
return(dstMaterial);
}
}
return(null);
}
private Texture2D GetDiffuseTexture(Schema2.Material srcMaterial)
{
var diffuse = srcMaterial.FindChannel("Diffuse");
if (diffuse == null)
{
diffuse = srcMaterial.FindChannel("BaseColor");
}
if (diffuse == null)
{
return(null);
}
var name = srcMaterial.Name;
if (name == null)
{
name = "null";
}
name += "-Diffuse";
return(_TexFactory.UseTexture(diffuse.Value.Texture?.PrimaryImage?.Content ?? default, name));
}
private static Material GetMaterialFromTriangle(Schema2.Material srcMaterial)
{
if (srcMaterial == null)
{
return(default);
