import javax.media.opengl.*;
import com.sun.opengl.util.*;
import processing.opengl.*;

String Mode = OPENGL;
String RMode = P3D;  // Rendering mode, mean do we use processing function to display or GL context functions
PFont fontA;
boolean bFlush = false;

// ____________________
void setup() 
{
  if ( RMode == OPENGL )
    Mode = OPENGL;
  size(640, 448, Mode);

  if ( Mode == OPENGL )
  {
    // enable VSync to avoid framerate problems ?
    PGraphicsOpenGL pgl;
    GL gl;
    pgl = (PGraphicsOpenGL)g; //processing graphics object
    gl = pgl.beginGL(); //begin opengl
    gl.setSwapInterval(1); //set vertical sync on, screen refresh is 60 Hz so framerate will be 60
    pgl.endGL(); //end opengl
  }
  else
  {
    frameRate(60); // a little more than 60 because 60hz screen and vsync activated ?
  }

  background(10);
  fontA = loadFont("ank-48.vlw");
}

// ____________________
void draw() 
{
  background(10);

  // display framerate
  color FillColor = color(204,204,204,255);
  fill(FillColor);
  textFont(fontA, 14);
  text("fps "+frameRate, 15, 15);
  text("Viewport Mode	  = "+Mode,15,30);
  text("Instruction Mode (R) = "+RMode, 15, 45);
  text("force flush (F) ? "+bFlush, 15, 60);

  // send some triangles to display
  // unoptimized to test
  int psize = 10;
  noStroke();
  if ( RMode == P3D )
  {
    for (int i=0; i<2000; i++)
    {
	pushMatrix();
	translate(random(width/3.0)+width/3.0, random(height/3.0)+height/3.0, random(80)+80); // reverse order, translate before rotate
	rotateZ(random(2*PI));
	beginShape();
	fill(color(random(255), random(255), random(255), random(255)));
	vertex(-psize/2.0, -psize/2.0);
	vertex(psize/2.0, -psize/2.0);
	vertex(psize/2.0, psize/2.0);
	vertex(-psize/2.0, psize/2.0);
	endShape();     
	popMatrix();
	if ( bFlush )
	  flush();
    }
  }
  else // RMode == OPENGL
  {
    for (int i=0; i<2000; i++)
    {
	PGraphicsOpenGL pgl;
	GL gl;
	pgl = (PGraphicsOpenGL)g; //processing graphics object
	gl = pgl.beginGL(); //begin opengl
	gl.glPushMatrix();
	gl.glTranslatef(random(width/3.0)+width/3.0, random(height/3.0)+height/3.0, random(80)+80);
	gl.glRotatef( random(2*PI), 0,0,1 );
	gl.glBegin(gl.GL_POLYGON);
	gl.glColor3f(random(255)/255.0,random(255)/255.0,random(255)/255.0);
	gl.glVertex3f(-psize/2.0, -psize/2.0, 0.0f);
	gl.glVertex3f(psize/2.0, -psize/2.0, 0.0f);
	gl.glVertex3f(psize/2.0, psize/2.0, 0.0f);
	gl.glVertex3f(-psize/2.0, psize/2.0, 0.0f);
	gl.glEnd();
	gl.glPopMatrix();
	if ( bFlush )
	  gl.glFlush();
	pgl.endGL(); //end opengl
    }
  }
}

// ____________________
void keyPressed()
{
  if ( key == 'f' || key == 'F' )
    bFlush = !bFlush;

  if ( key == 'r' || key == 'R' )
  {
    if ( Mode == OPENGL )
    {
	if (RMode == OPENGL )
	{
	  RMode = P3D;
	  println("going to P3D Rmode");
	}
	else if ( RMode == P3D )
	{
	  RMode = OPENGL;
	  println("going to OPENGL Rmode");
	}
    }
    else
	  println("Can't switch to OpenGL instructions in P3D render mode");
  }
}