/* ================================================================
Program
----------------
This file describes our Program class. This class is responsible for
loading, creating, and compiling OpenGL programs.
================================================================ */
#ifndef PROGRAM_HPP
#define PROGRAM_HPP
#include "common.hpp"
#include <vector>
class Program {
  //
  public:
    class Variable {
      friend class Program;
    public:
      enum VariableType {
        UNDEF, INT, UINT, FLOAT, DOUBLE, TEXTURE
      };
      Variable(VariableType type);
      ~Variable();
    protected:
      int type;     // 0 = uniform, 1 = attribute
      GLint location;
      int data_type;
      char *data;
      size_t length;
    };
    class Texture {
      friend class Program;
      public:
        Texture() { location = -1; index = 0; texture = 0;};
      protected:
        GLint location;
        GLuint index;
        GLuint texture;
    };
  public:
    Program();
    ~Program();
    int addShader(const char *file, GLenum type);
    int attachTexture(GLuint index, GLuint texture);
    int setTexture(GLuint index, GLuint texture);
    int doCompile();
    int doClean();
    GLuint getUniform(const char *name);
    GLuint getProgram();
    int activate();
    int deactivate();
  protected:
    GLuint program;     // Compiled shader program
  private:
    std::vector<GLenum> shader_type;    // Type of shader program, tied to v
    std::vector<GLuint> shader_prog;    // Compiled shader program, tied to ^
    std::vector<GLuint> shader_uniform; // Shader uniform locations
    std::vector<Texture> shader_textures;// Textures that this shader uses
    std::vector<Variable> shader_variables;
};
#endif