Using set(x, y, color) in GLGRAPHICS mode decrease framerate from 60fps to 10. I have tried also use pixels[], but result is same.

"Setting the color of a single pixel with set(x, y) is easy, but not as fast as putting the data directly into pixels[]. The equivalent statement to "set(x, y, #000000)" using pixels[] is "pixels[y*width+x] = #000000". You must call loadPixels() to load the display window data into the pixels[] array before setting the values and calling updatePixels() to update the window with any changes."

Please put this code into GLGRAPHICS without loosing performance..

1. //import processing.opengl.*;
   //import codeanticode.glgraphics.*;
   
   PImage img, dest;
   color[] col = new color[480000];
   
   void setup() {
     size(1600, 600, P2D);
     //size(1600, 600, GLConstants.GLGRAPHICS);
   
     img = loadImage("landscape.jpg");
     img.loadPixels();
     for (int i = 0; i < 480000; i++) {
       col[i]=img.pixels[i];
     }
     dest = createImage(800, 600, RGB);
     dest.loadPixels();
     for (int i = 0; i < 480000; i++) {
       dest.pixels[i]=col[480000-i-1];
     }
   }
   
   void draw() {
   
     for (int i = 0; i < 7000; i++) {
       int px=int(random(0, 800));
       int py=int(random(0, 600));
       dest.set(px, py+int(random(0, 1)), color(255, 0, 0));
       //dest.pixels[px + 800*(py+int(random(0, 1)))] = #F00000;
       //dest.updatePixels();
     }
   
     image(img, 0, 0);
     image(dest, 800, 0);
   
     println(frameRate);
   }