moving the OpenGL examples to the core

java/examples/OpenGL/Performance/StaticParticlesImmediate/StaticParticlesImmediate.pde

@@ -0,0 +1,65 @@
+PImage sprite;  
+
+int npartTotal = 50000;
+float partSize = 20;
+
+PVector positions[];
+
+int fcount, lastm;
+float frate;
+int fint = 3;
+
+void setup() {
+  size(800, 600, P3D);
+  frameRate(60);
+  
+  sprite = loadImage("sprite.png");
+
+  initPositions();
+
+  // Writing to the depth buffer is disabled to avoid rendering
+  // artifacts due to the fact that the particles are semi-transparent
+  // but not z-sorted.
+  hint(DISABLE_DEPTH_MASK);
+} 
+
+void draw () {
+  background(0);
+
+  translate(width/2, height/2);
+  rotateY(frameCount * 0.01);
+ 
+  for (int n = 0; n < npartTotal; n++) {
+    drawParticle(positions[n]);
+  }
+  
+  fcount += 1;
+  int m = millis();
+  if (m - lastm > 1000 * fint) {
+    frate = float(fcount) / fint;
+    fcount = 0;
+    lastm = m;
+    println("fps: " + frate); 
+  }  
+}
+
+void drawParticle(PVector center) {
+  beginShape(QUAD);
+  noStroke();
+  tint(255);
+  texture(sprite);
+  normal(0, 0, 1);
+  vertex(center.x - partSize/2, center.y - partSize/2, center.z, 0, 0);
+  vertex(center.x + partSize/2, center.y - partSize/2, center.z, sprite.width, 0);
+  vertex(center.x + partSize/2, center.y + partSize/2, center.z, sprite.width, sprite.height);
+  vertex(center.x - partSize/2, center.y + partSize/2, center.z, 0, sprite.height);                
+  endShape();  
+}
+
+void initPositions() {
+  positions = new PVector[npartTotal];
+  for (int n = 0; n < positions.length; n++) {
+    positions[n] = new PVector(random(-500, +500), random(-500, +500), random(-500, +500));
+  }  
+}
+