removed const from draw functions

include/lol/Camera.hpp

@@ -54,7 +54,7 @@ namespace lol
 		 * 
 		 * @param drawable A Drawable that should be rendered through this camera
 		 */
-		inline void Draw(const Drawable& drawable) const
+		inline void Draw(Drawable& drawable) const
 		{
 			drawable.Draw(*this);
 		}

include/lol/Drawable.hpp

@@ -23,14 +23,14 @@ namespace lol
 		 * 
 		 * @param camera The camera with which this object is rendered.
 		 */
-		virtual void PreRender(const CameraBase& camera) const { };
+		virtual void PreRender(const CameraBase& camera) { };
 
 		/**
 		 * @brief Bind the shader and draw the VAO
 		 * 
 		 * @param camera The camera with which this object is rendered.
 		 */
-		void Draw(const CameraBase& camera) const;
+		void Draw(const CameraBase& camera);
 
 		/**
 		 * @brief The VAO can be rendered as a mesh, a set of lines, loops, strips etc

include/lol/Shader.hpp

@@ -39,6 +39,14 @@ namespace lol
 		void Bind();
 		void Unbind();
 
+		/**
+		 * Set a float uniform
+		 *
+		 * @param name  Name of the uniform
+		 * @param value Value of the uniform
+		 */
+		void SetUniform(const std::string& name, float value);
+
 		/**
 		 * Set a 4x4 matrix uniform
 		 * 

src/Drawable.cpp

@@ -3,7 +3,7 @@
 namespace lol
 {
 
-	void Drawable::Draw(const CameraBase& camera) const
+	void Drawable::Draw(const CameraBase& camera)
 	{
 		shader->Bind();
 		vao->Bind();

src/Shader.cpp

@@ -86,6 +86,15 @@ namespace lol
 		glUseProgram(0);
 	}
 
+	void Shader::SetUniform(const std::string& name, float value)
+	{
+		GLint location = glGetUniformLocation(id, name.c_str());
+		if (location == -1)
+			return;
+
+		glUniform1f(location, value);
+	}
+
 	void Shader::SetUniform(const std::string& name, const glm::mat4& value)
 	{
 		GLint location = glGetUniformLocation(id, name.c_str());