gradient.cl

// Copyright (c) 2011-2012, Motorola Mobility, Inc.
// All rights reserved.
//
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__kernel void compute(__write_only image2d_t bmp)
{
  int x = get_global_id(0);
  int y = get_global_id(1);
  int w = get_global_size(0)-1;
  int h = get_global_size(1)-1;

  int2 coords = (int2)(x,y);

  float red = (float)x/(float)w;
  float blue = (float)y/(float)h;

  write_imagef(bmp, coords, (float4)(blue, 0.0f, red, 1.0f));

  // on Mac, writing integers doesn't work!!!
  //write_imagei(bmp, coords, (int4)(blue*255, 0, red*255, 255));
}