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graphic-player-10-pixel-sample-shaders-pixelate.pbk / pbk

*************************************************************************** Copyright (C) 2008 Adobe Systems Incorporated All Rights Reserved. NOTICE: All information contained herein is, and remains the property of Adobe Systems Incorporated and its suppliers, if any. The intellectual and technical concepts contained herein are proprietary to Adobe Systems Incorporated and its suppliers and may be covered by U.S. and Foreign Patents, patents in process, and are protected by trade secret or copyright law. Dissemination of this information or reproduction of this material is strictly forbidden unless prior written permission is obtained from Adobe Systems Incorporated. ***************************************************************************

  <languageVersion: 1.0;>
  // pixelate: A simple example to demonstrate the use of the hydra sampling 
  //           function to yield an interesting effect.  The filter uses the 
  //           floor built-in function on the current output coordinate to 
  //           determine the sampling location.
  kernel pixelate
  <   namespace : "AIF";
      vendor : "Adobe Systems";
      version : 2;
      description : "pixelate an image"; >
      // An input parameter used to specify the width and height of the 
      // pixelation.  The parameters come directly from the user by way of the 
      // UI that gets created for the filter.
      parameter int dimension
      <minValue: 1;
       maxValue: 100;
       defaultValue: 1;>;
      input image4 inputImage;
      output pixel4 outputPixel;
      // evaluatePixel(): The function of the filter that actually does the 
      //                  processing of the image.  This function is called once 
      //                  for each pixel of the output image.
          // Convert the dimension into a floating point value for use in 
          // arithmetic.  To avoid sinister issues, all type conversions are 
          // required to be explicit.
          float dimAsFloat = float(dimension);
          // Truncate the pixel location to the value at the top right corner of 
          // the square.
          float2 sc = floor(outCoord() / float2(dimAsFloat, dimAsFloat));
          sc *= dimAsFloat;
          // sample the input at the location and set the output to the sampled 
          // value.
          outputPixel = sampleNearest(inputImage, sc);

(C) Æliens 20/2/2008

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