MultiBufferVAO.cpp

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

  void MultiBufferVAO::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 MultiBufferVAO::removeVAO()
  {
    if(m_bound == true)
    {
      unbind();
    }
    if( m_allocated ==true)
    {
      for(auto b : m_vboIDs)
      {
        glDeleteBuffers(1,&b);
      }
      glDeleteVertexArrays(1,&m_id);
      m_allocated=false;
    }
  }
  void MultiBufferVAO::setData(const VertexData &_data)
  {
    if(m_bound == false)
    {
      std::cerr<<"trying to set VOA data when unbound\n";
    }

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

  }

  GLuint MultiBufferVAO::getBufferID(unsigned int _id )
  {
    NGL_ASSERT(_id<m_vboIDs.size());
    return m_vboIDs[_id];
  }



}