refactor rendering

include/td/render/shader/ShaderProgram.h

@@ -1,10 +1,15 @@
 #pragma once
 
+#include <string>
 #include <td/Maths.h>
 #include <td/render/OpenGL.h>
-#include <string>
 
 namespace td {
+
+namespace render {
+class Renderer;
+}  // namespace render
+
 namespace shader {
 
 class ShaderProgram {
@@ -15,10 +20,10 @@ class ShaderProgram {
 	void Start() const;
 	void Stop() const;
 
+  protected:
 	void LoadProgramFile(const std::string& vertexFile, const std::string& fragmentFile);
 	void LoadProgram(const std::string& vertexSource, const std::string& fragmentSource);
 
-  protected:
 	virtual void GetAllUniformLocation() = 0;
 	int GetUniformLocation(const std::string& uniformName) const;