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  Fastest Way To Clear Screen?  (Read 24236 times)
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Offline Archive
« Posted 2016-04-07 02:30:39 »

Is this the fastest way to clear a screen? Storing a "cleared" screen in another array and System.arraycopying it into the current pixel array?

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public final class Display {

   private int[] clearedPixels;
   int[] pixels;
   int width;
   int height;
   private int size;
   
   public Display(int w, int h) {
      this.width = w;
      this.height = h;
      pixels = new int[w * h];
      clearedPixels = new int[w * h];
      size = w * h;
   }

   public void setClearColor(int color) {
      for (int i = 0; i < clearedPixels.length; i++) {
         clearedPixels[i] = color;
      }
   }
   
   public void clear() {
      System.arraycopy(clearedPixels, 0, pixels, 0, size);
   }

}

Offline theagentd
« Reply #1 - Posted 2016-04-07 04:20:14 »

Try Arrays.fill().

Myomyomyo.
Offline Archive
« Reply #2 - Posted 2016-04-07 04:32:20 »

Try Arrays.fill().
That method is just a for loop with some extra safety precautions that make it even slower. System.arraycopy is native code so it's lightning fast haha

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Offline BurntPizza

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« Reply #3 - Posted 2016-04-07 04:46:03 »

Be careful with such assumptions within a highly optimizing runtime: http://psy-lob-saw.blogspot.com/2015/04/on-arraysfill-intrinsics-superword-and.html
Offline Archive
« Reply #4 - Posted 2016-04-07 04:57:16 »

Be careful with such assumptions within a highly optimizing runtime: http://psy-lob-saw.blogspot.com/2015/04/on-arraysfill-intrinsics-superword-and.html
Ahhh.... that's very interesting thank you for showing that to me!

Offline Roquen

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Medals: 516



« Reply #5 - Posted 2016-04-07 07:23:04 »

Along the same lines, just because there's a classfile that defines method "foo", you can't assume that "foo" is ever actually executed.  Specifically intrinsic methods.  This is getting long in the tooth now...maybe I should update it sometime: http://www.java-gaming.org/topics/hotspot-intrinsics/27010/view.html
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