7. glm::value_ptr

• glm::value_ptr takes any of the core template types. It returns a pointer to the memory layout of the object. For example, given

  
      glm::mat4 m4( 1.0f ); // construct identity matrix
  
  

  expressions

  
      glm::value_ptr( m4 )
      &m4[0][0]
  
  

  are equivalent.

• value_ptr() returns a direct pointer to the matrix data in column-major order, making it useful for uploading data to OpenGL.