implemented basic shader expressions

src/Engine/Material/Material.h

@@ -8,7 +8,14 @@ class Material : public MaterialInterface
 {
 public:
     Material() {}
-    Material(Gfx::PGraphics graphics, Array<PShaderParameter> parameter, Gfx::PDescriptorLayout layout, uint32 uniformDataSize, uint32 uniformBinding, std::string materialName);
+    Material(Gfx::PGraphics graphics, 
+        Array<PShaderParameter> parameter, 
+        Gfx::PDescriptorLayout layout, 
+        uint32 uniformDataSize, 
+        uint32 uniformBinding, 
+        std::string materialName, 
+        Array<PShaderExpression> expressions, 
+        MaterialNode brdf);
     virtual ~Material();
     virtual Gfx::PDescriptorSet createDescriptorSet();
     virtual Gfx::PDescriptorLayout getDescriptorLayout() const { return layout; }
@@ -17,6 +24,8 @@ public:
     virtual void save(ArchiveBuffer& buffer) const;
     virtual void load(ArchiveBuffer& buffer);
 
+    void compile();
+
     virtual const Gfx::ShaderCollection* getShaders(Gfx::RenderPassType renderPass, VertexInputType* vertexInput) const;
     virtual Gfx::ShaderCollection& createShaders(Gfx::PGraphics graphics, Gfx::RenderPassType renderPass, VertexInputType* vertexInput);
 private:
@@ -25,6 +34,8 @@ private:
 
     Gfx::PDescriptorLayout layout;
     std::string materialName;
+    Array<PShaderExpression> codeExpressions;
+    MaterialNode brdf;
     // With draw-indirect, we batch vertex data into big vertex buffers
     // Gfx::PVertexDataManager vertexData;