nodes: made changes to the node system to allow for context sensitive shader code

Primarily implemented for the math node so a new shader can be generated and
compiled based on what inputs the node is receiving.

app/node/math/math.h

@@ -17,7 +17,26 @@ public:
 
   virtual void Retranslate() override;
 
+  virtual Capabilities GetCapabilities(const NodeValueDatabase&) const override;
+  virtual QString ShaderID(const NodeValueDatabase&) const override;
+  virtual QString ShaderFragmentCode(const NodeValueDatabase&) const override;
+
+  virtual NodeValue InputValueFromTable(NodeInput* input, const NodeValueTable& table) const override;
+
 private:
+  enum Operation {
+    kOpAdd,
+    kOpSubtrack,
+    kOpMultiply,
+    kOpDivide
+  };
+
+  static NodeParam::DataType GuessTypeFromTable(const NodeValueTable& table);
+
+  static QString GetUniformTypeFromType(const NodeParam::DataType& type);
+
+  static QString GetVariableCall(const QString& input_id, const NodeParam::DataType& type);
+
   NodeInput* method_in_;
 
   NodeInput* param_a_in_;