4.8 How to use GL_ARB_vertex_buffer_object extension of OpenGL based on GLEW?

  In the lastest SOL9.2.0 library, we have added new classes OpenGLBufferARB, OpenGLBufferedShapd, OpenGLIndexBufferARB, and OpenGLVertexBufferARB to 'sol/openglarb/' folder to support GL_ARB_vertex_buffer_object extension in GLEW.

 OpenGLObject
OpenGLBufferedShap
OpenGLBufferARB
OpenGLIndexBufferARB
OpenGLVertexBufferARB
  The following BufferedGradientColoredCube is a very simple sample program to draw OpenGLColoredCube by using those classes.



/*
 * BufferedGradientColoredCube.cpp 
 * Copyright (c) 2015 Antillia.com TOSHIYUKI ARAI. ALL RIGHTS RESERVED. 
 */


#include <sol/opengl/OpenGLMainView.h>
#include <sol/opengl/OpenGLView.h>
#include <sol/opengl/OpenGLGC.h>
#include <sol/opengl/OpenGLColoredCube.h>
#include <sol/openglarb/OpenGLBufferedShape.h>

#include "Resource.h"

namespace SOL {

class MainView :public OpenGLMainView {

private:
  //Inner class starts.
  class SimpleView: public OpenGLView {
  private:
    SmartPtr<OpenGLGC>              gc;
    SmartPtr<OpenGLColoredCube>     cube1;
    SmartPtr<OpenGLColoredCube>     cube2;
    SmartPtr<OpenGLBufferedShape>   shape1;
    SmartPtr<OpenGLBufferedShape>   shape2;
    
  public:
  virtual void display()
  {
    if (gc && shape1 && shape2) { 
      gc -> clear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
      gc -> loadIdentity();
      gc -> clearColor(1.0, 1.0, 1.0, 1.0);

      try {
        //Draw the first shape1.
        gc->pushMatrix();
          gc -> translate(-1.5f,0.0f,-1.0f);  
          gc -> lookAt(2.0, 8.0, 15.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0); 
          shape1->draw(gc);
        gc->popMatrix();

        //Draw the second shape2.
        gc->pushMatrix();
          gc -> translate(1.8f,0.0f,-4.0f);  
          gc -> lookAt(-4.0, -16.0, 20.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0); 
          shape2->draw(gc);
        gc->popMatrix();

      } catch (Exception& ex) {
        caught(ex); 
      }
    }
  }
 
  virtual void resize(int w, int h)
  {
    if (w == 0 || h == 0) {
      return;
    }
    if (gc) {
      gc -> matrixMode(GL_PROJECTION);
      gc -> loadIdentity();
      gc -> perspective(16.0, (double)w / (double)h, 0.5, 40.0); 

      gc -> matrixMode(GL_MODELVIEW);
    }
  }

  virtual void initialize()
  {
    gc = new OpenGLGC();

    gc -> matrixMode(GL_PROJECTION);
    gc -> loadIdentity();

    gc -> enable( GL_DEPTH_TEST );
    gc -> frustum(1 , -1 , -1 , 1 , 1 , 10);
    gc -> clear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
    
    try {
      cube1 = new OpenGLColoredCube();
      cube2 = new OpenGLColoredCube();
      
      Color3<GLfloat> colorsForEachVertex1[] = {
        //face 1:
        { 1.0f, 0.0f, 0.0f}, 
        { 0.0f, 1.0f, 0.0f}, 
        { 0.0f, 0.0f, 1.0f}, 
        { 1.0f, 1.0f, 0.0f},
        
        //face 2:
        { 1.0f, 0.0f, 0.0f}, 
        { 0.0f, 1.0f, 0.0f}, 
        { 0.0f, 0.0f, 1.0f}, 
        { 1.0f, 1.0f, 0.0f},
        
        //face 3:
        { 1.0f, 0.0f, 0.0f}, 
        { 0.0f, 1.0f, 0.0f}, 
        { 0.0f, 0.0f, 1.0f}, 
        { 1.0f, 1.0f, 0.0f},
        
        //face 4:
        { 1.0f, 0.0f, 0.0f}, 
        { 0.0f, 1.0f, 0.0f}, 
        { 0.0f, 0.0f, 1.0f}, 
        { 1.0f, 1.0f, 0.0f},
        
        //face 5:
        { 1.0f, 0.0f, 0.0f}, 
        { 0.0f, 1.0f, 0.0f}, 
        { 0.0f, 0.0f, 1.0f}, 
        { 1.0f, 1.0f, 0.0f},
        
        //face 6:
        { 1.0f, 0.0f, 0.0f}, 
        { 0.0f, 1.0f, 0.0f}, 
        { 0.0f, 0.0f, 1.0f}, 
        { 1.0f, 1.0f, 0.0f},
      };
      
      cube1->setVerticesColors(colorsForEachVertex1, CountOf(colorsForEachVertex1));

      Color3<GLfloat> colorsForEachVertex2[] = {
        //face 1:
        { 0.0f, 0.2f, 0.4f}, 
        { 0.4f, 0.6f, 0.8f}, 
        { 0.8f, 0.6f, 0.4f}, 
        { 0.4f, 0.2f, 0.0f},
        
        //face 2:
        { 0.0f, 0.2f, 0.4f}, 
        { 0.4f, 0.6f, 0.8f}, 
        { 0.8f, 0.6f, 0.4f}, 
        { 0.4f, 0.2f, 0.0f},
        
        //face 3:
        { 0.0f, 0.2f, 0.4f}, 
        { 0.4f, 0.6f, 0.8f}, 
        { 0.8f, 0.6f, 0.4f}, 
        { 0.4f, 0.2f, 0.0f},
        
        //face 4:
        { 0.0f, 0.2f, 0.4f}, 
        { 0.4f, 0.6f, 0.8f}, 
        { 0.8f, 0.6f, 0.4f}, 
        { 0.4f, 0.2f, 0.0f},
        
        //face 5:
        { 0.0f, 0.2f, 0.4f}, 
        { 0.4f, 0.6f, 0.8f}, 
        { 0.8f, 0.6f, 0.4f}, 
        { 0.4f, 0.2f, 0.0f},
        
        //face 6:
        { 0.0f, 0.2f, 0.4f}, 
        { 0.4f, 0.6f, 0.8f}, 
        { 0.8f, 0.6f, 0.4f}, 
        { 0.4f, 0.2f, 0.0f},
      };
      cube2->setVerticesColors(colorsForEachVertex2, CountOf(colorsForEachVertex2));
           
      shape1 = new OpenGLBufferedShape(cube1);
      shape2 = new OpenGLBufferedShape(cube2);
   
    } catch (Exception& ex) {
      caught(ex);
    }
  }

  public:
    SimpleView(View* parent, const char* name, Args& args)
    :OpenGLView(parent, name, args)
    {
    } 

    ~SimpleView()
    {
    }
  };
  
  //Inner class ends.
  
private:
  SmartPtr<SimpleView>  view;

  long size(Event& event)
  {
    int w, h;
    event.getSize(w, h);
    if (view) {
      view -> reshape(10, 10, w-20, h-20);
      view -> postResizeRequest(w-20, h-20);
    }
    return 1L;
  }

public:
  MainView(Application& applet, const char* name, Args& args)
  :OpenGLMainView(applet, name, args) 
  {
    Args ar;
    view = new SimpleView(this, "", ar);
  }

  ~MainView()
  {
  }
};
}

//
void Main(int argc, char** argv) 
{
  try {    
    const char*  name = appName(argv[0]);
    Application applet(name, argc, argv);

    Args args;
    args.set(XmNwidth,  480);
    args.set(XmNheight, 480);
    
    MainView view(applet, name, args);
    view.realize();

    applet.run();
    
  } catch (Exception& ex) {
    caught(ex);
  }
}



Last modified: 8 Dec 2016

 Last modified: 8 Dec 2016

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