SimpleVAO.cpp

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#include "SimpleVAO.h"
#include <iostream>
namespace ngl
{
  SimpleVAO::~SimpleVAO()
  {
    removeVAO();
  }

  void SimpleVAO::draw() const
  {
    if(m_allocated == false)
    {
      std::cerr<<"Warning trying to draw an unallocated VOA\n";
    }
    if(m_bound == false)
    {
      std::cerr<<"Warning trying to draw an unbound VOA\n";
    }
    glDrawArrays(m_mode, 0, static_cast<GLsizei>(m_indicesCount));
  }

  void SimpleVAO::removeVAO()
  {
    if(m_bound == true)
    {
      unbind();
    }
    if( m_allocated ==true)
    {
        glDeleteBuffers(1,&m_buffer);
    }
    glDeleteVertexArrays(1,&m_id);
    m_allocated=false;
    }

  void SimpleVAO::setData(const VertexData &_data)
  {
    if(m_bound == false)
    {
      std::cerr<<"trying to set VOA data when unbound\n";
    }
    if( m_allocated ==true)
    {
        glDeleteBuffers(1,&m_buffer);
    }

    glGenBuffers(1, &m_buffer);
    // now we will bind an array buffer to the first one and load the data for the verts
    glBindBuffer(GL_ARRAY_BUFFER, m_buffer);
    glBufferData(GL_ARRAY_BUFFER,static_cast<GLsizeiptr>( _data.m_size), &_data.m_data, _data.m_mode);
    m_allocated=true;

  }

}