.. _program_listing_file_gui_Entities_E_Light.hpp:

Program Listing for File E_Light.hpp
====================================

|exhale_lsh| :ref:`Return to documentation for file <file_gui_Entities_E_Light.hpp>` (``gui/Entities/E_Light.hpp``)

.. |exhale_lsh| unicode:: U+021B0 .. UPWARDS ARROW WITH TIP LEFTWARDS

.. code-block:: cpp

   #pragma once
   
   #include <glm/glm.hpp>
   #include <glm/gtc/matrix_transform.hpp>
   #include <glm/gtc/type_ptr.hpp>
   
   #include "Demeter/Demeter.hpp"
   #include "Demeter/Entity.hpp"
   
   class E_Light : public Dem::IEntity {
   private:
   
   public:
     bool Init(Dem::Demeter &) override
     {
       return true;
     }
   
     bool Update(Dem::Demeter &) override
     {
       return true;
     }
   
     bool Draw(Dem::Demeter &d) override
     {
       // Draw light effects if needed
       glm::vec3 lightPos(200.0, 500.0, 200.0);  // arbitrary light position
       glm::vec3 viewPos = glm::
         vec3(glm::inverse(d.camera.GetView())[3]);  // camera position
   
       GLint lightPosLoc = d.GetShader()->GetUniformLocation("lightPos");
       GLint viewPosLoc = d.GetShader()->GetUniformLocation("viewPos");
       glUniform3fv(lightPosLoc, 1, glm::value_ptr(lightPos));
       glUniform3fv(viewPosLoc, 1, glm::value_ptr(viewPos));
   
       return true;
     }
   };