Reintroducing type parameters for vertex data

res/shaders/lib/Material.slang

@@ -1,12 +1,13 @@
 import Common;
 import MaterialParameter;
 import Scene;
+import LightEnv;
 
-//interface IMaterial
-//{
-//    associatedtype BRDF: IBRDF;
-//	static BRDF prepare(MaterialParameter input);
-//};
+interface IMaterial
+{
+    associatedtype BRDF: IBRDF;
+	BRDF prepare(MaterialParameter input);
+};
 struct MaterialResources
 {
     Texture2D textureArray[512];

res/shaders/lib/StaticMeshVertexData.slang

@@ -2,7 +2,7 @@ import Common;
 import VertexData;
 import MaterialParameter;
 
-struct StaticMeshVertexData
+struct StaticMeshVertexData : IVertexData
 {
     float uint16ToFloat(uint16_t value)
     {
@@ -34,5 +34,3 @@ struct StaticMeshVertexData
 	StructuredBuffer<uint16_t> color;
 	StructuredBuffer<uint16_t> texCoords[MAX_TEXCOORDS];
 };
-layout(set=1)
-ParameterBlock<StaticMeshVertexData> pVertexData;

res/shaders/lib/VertexData.slang

@@ -6,7 +6,9 @@ struct VertexInput
 	uint instanceId: SV_InstanceID;
 }
 
-//interface IVertexData
-//{
-//    VertexAttributes getAttributes(uint index);
-//};
+interface IVertexData
+{
+    VertexAttributes getAttributes(uint index);
+};
+layout(set = 1)
+ParameterBlock<IVertexData> pVertexData;