npr/vertexarray.cpp at master · blendmaster/npr · GitHub

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#include <GL/glew.h>
#include <GL/gl.h>
#include <vector>
#include <cassert>
#include <iostream>
#include <cstdlib>

#include "vertexarray.h"

using namespace std;

namespace EZGraphics {

/* ------------------------------------------- */

VertexArray::VertexArray ( const VertexArray & rhs )
{
  cerr << "Attempting to copy VertexArray object" << endl;
  exit(1);
}

/* ------------------------------------------- */

VertexArray & VertexArray::operator= ( const VertexArray & rhs )
{
  cerr << "Attempting assignment of VertexArray object" << endl;
  exit(1);
}

/* ------------------------------------------- */

VertexArray::VertexArray()
{
  glGenVertexArrays(1,&handle);
}

/* ------------------------------------------- */

VertexArray::~VertexArray()
{
  assert(glIsVertexArray(handle));
  glDeleteVertexArrays(1,&handle);
}

/* ------------------------------------------- */

void VertexArray::attachInstancedAttribute ( const GLuint aix, const Buffer * b, GLuint divisor )
{
  glBindVertexArray(handle);
  b->setIndex(aix);
  glEnableVertexAttribArray(aix);
  glVertexAttribDivisor(aix,divisor);
  glBindVertexArray(0);
}

/* ------------------------------------------- */

void VertexArray::attachAttribute ( const GLuint aix, const Buffer * b )
{
  glBindVertexArray(handle);
  b->setIndex(aix);
  glEnableVertexAttribArray(aix);
  glBindVertexArray(0);
}

/* ------------------------------------------- */

void VertexArray::on()
{
  glBindVertexArray(handle);
}

/* ------------------------------------------- */

void VertexArray::off()
{
  glBindVertexArray(0);
}

/* ------------------------------------------- */

void VertexArray::sendToPipeline ( GLenum ptype, GLint first, GLsizei num )
{
  on();
  glDrawArrays(ptype,first,num);
  off();
}

/* ------------------------------------------- */

void VertexArray::sendToPipelineInstanced ( GLenum ptype, GLint first, GLsizei num, GLsizei N )
{
  on();
  glDrawArraysInstanced(ptype,first,num,N);
  off();
}

/* ------------------------------------------- */

void VertexArray::setDivisor ( GLuint aix, GLuint divisor )
{
  on();
  glVertexAttribDivisor(aix,divisor);
  off();
}

/* ------------------------------------------- */

void VertexArray::resetDivisor ( GLuint aix )
{
  setDivisor(aix,0);
}

/* ------------------------------------------- */

void VertexArray::sendToPipelineIndexed ( GLenum ptype, IndexBuffer *b, GLint first, GLsizei num )
{
  on();
  b->on();
  glDrawElements(ptype,num,b->getType(),(GLvoid*)(long)first);
  b->off();
  off();
}

/* ------------------------------------------- */


void VertexArray::sendToPipelineInstancedIndexed ( GLenum ptype, IndexBuffer *b, GLint first, GLsizei num, GLsizei N )
{
  on();
  b->on();
  glDrawElementsInstanced(ptype,num,b->getType(),(GLvoid*)(long)first,N);
  b->off();
  off();
}

/* ------------------------------------------- */

};