text: #ifndef _GL_UTILS_H_
  #define _GL_UTILS_H_
  
  #include <string>
  #include <vector>
  
  #include <GL/gl.h>
  
  GLuint make_shader(GLenum shader_type, const std::string& filename);
  GLuint make_program(const std::vector<GLuint>&shaders);
  GLuint get_next_texture();
  int load_texture(const std::string &filename, GLuint &texture_ind);
  
  int check_for_gl_error();
  
  #endif
  