VIZ++ Samples

1 Screenshot

2 Source code

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


//2017/02/10

#include <viz++/opengl/OpenGLMainView.h>
#include <viz++/opengl/OpenGLGC.h>
#include <viz++/opengl/OpenGLTexture2D.h>

namespace VIZ {

class MainView :public OpenGLMainView {

private:
  SmartPtr<OpenGLGC>        gc;
  SmartPtr<OpenGLTexture2D> texture;

public:
  virtual void display()
  {
    if (gc) {
      gc -> clearColor(1.0, 1.0, 1.0, 1.0);
      gc -> clear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
      gc -> color(1.0, 1.0, 1.0);
//      gc -> rotate(5.0, 0.5, 1.0, 0.25);


      glNormal3d(0.0, 0.0, 1.0);
      gc -> begin(GL_QUADS);
      texture -> coord(0.0, 0.0); 
      gc-> vertex(-1.0,  1.0, 0.0);

      texture -> coord(1.0, 0.0); 
      gc ->vertex( 1.0,  1.0, 0.0);

      texture -> coord(1.0, 1.0); 
      gc -> vertex( 1.0, -1.0, 0.0);

      texture -> coord(0.0, 1.0); 
      gc -> vertex(-1.0, -1.0, 0.0);
      gc -> end();
    }
  }
  
  virtual void resize(int w, int h)
  {
    if (w == 0 || h == 0) {
        return;
    }
    
    if (gc) {
      gc -> matrixMode(GL_PROJECTION);
      gc -> loadIdentity();
      gc -> ortho(-1.25, 1.25, -1.25, 1.25, 1., 20.);

      gc -> matrixMode(GL_MODELVIEW);
      gc -> loadIdentity();
      gc -> lookAt(0., 0., 10., 0., 0., 0., 0., 1., 0.);
    }
  }

  virtual void initialize()
  {
    gc = new OpenGLGC();
    gc -> enable(GL_DEPTH_TEST);
    gc -> enable(GL_TEXTURE_2D);

    createTexture("./images/Flower.png");
      //createTexture("./images/Dragonfly.png");
    setSubImage("./images/Nanten.png", 0, 20, 20);
  }

public:
  void createTexture(const char* filename)
  {
    texture = new OpenGLTexture2D();
    texture -> bind();
    texture -> parameter(GL_TEXTURE_MIN_FILTER, GL_LINEAR);
    texture -> parameter(GL_TEXTURE_MAG_FILTER, GL_LINEAR);
    texture -> env(GL_TEXTURE_ENV_MODE, GL_MODULATE); 

    try {
      texture -> imageFromPNGFile(filename);
    } catch (Exception& ex) {
      caught(ex);
    }
  }

public:
  void setSubImage(const char* filename, GLint level, GLint offset, GLint yoffset)
  {
    try {
      texture -> subImageFromPNGFile(filename, level, offset, yoffset);
    } catch (Exception& ex) {
      ex.display();
    }
  }

public:
  MainView(OpenGLApplet& applet, int width, int height, const char* name)
  :OpenGLMainView(applet, width, height, name)
  {
  }

  ~MainView()
  {
  }
};
}

//
int main(int argc, char** argv) 
{
  try {
    ModuleFileName module;
    const char*  name = module.getAppName();
    OpenGLApplet applet(argc, argv);

    MainView view(applet, 640, 480, name);
    view.realize();

    applet.run();
    
  } catch (Exception& ex) {
    caught(ex);
  }
  return 0;
}