tests/mandel/mandel.c

   1 /*
   2  * Copyright 2008, Google Inc.
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions are
   7  * met:
   8  *
   9  *     * Redistributions of source code must retain the above copyright
  10  * notice, this list of conditions and the following disclaimer.
  11  *     * Redistributions in binary form must reproduce the above
  12  * copyright notice, this list of conditions and the following disclaimer
  13  * in the documentation and/or other materials provided with the
  14  * distribution.
  15  *     * Neither the name of Google Inc. nor the names of its
  16  * contributors may be used to endorse or promote products derived from
  17  * this software without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  20  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  21  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  22  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  23  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  24  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  25  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  26  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  27  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  28  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  29  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  30  */
  31
  32 /*
  33   simple demo for nacl client, computed mandelbrot set
  34 */
  35
  36 #include <string.h>
  37
  38 #include <nacl/nacl_srpc.h>
  39
  40 int Mandel(NaClSrpcChannel *, NaClSrpcArg **, NaClSrpcArg **);
  41
  42 NACL_SRPC_METHOD("mandel:dddd:iii", Mandel);
  43
  44 /*
  45  * Sample application-specific RPC code.
  46  */
  47
  48 int Mandel(NaClSrpcChannel *channel,
  49            NaClSrpcArg **in_args,
  50            NaClSrpcArg **out_args) {
  51   double i = in_args[0]->u.dval;
  52   double j = in_args[1]->u.dval;
  53   double xsteps = in_args[2]->u.dval;
  54   double ysteps = in_args[3]->u.dval;
  55
  56   double cx = (4.0/xsteps) * i - 3.0;
  57   double cy = 1.5 - (3.0/ysteps) * j;
  58
  59   double re = cx;
  60   double im = cy;
  61   const double threshold = 1.0e8;
  62   int r;
  63   int g;
  64   int b;
  65
  66   int count = 0;
  67   while (count < 256 && re * re + im * im < threshold) {
  68     double new_re = re * re - im * im + cx;
  69     double new_im = 2 * re * im + cy;
  70     re = new_re;
  71     im = new_im;
  72     count++;
  73   }
  74
  75   if (count < 8) {
  76     r = 128;
  77     g = 0;
  78     b = 0;
  79   } else if (count < 16) {
  80     r = 255;
  81     g = 0;
  82     b = 0;
  83   } else if (count < 32) {
  84     r = 255;
  85     g = 255;
  86     b = 0;
  87   } else if (count < 64) {
  88     r = 0;
  89     g = 255;
  90     b = 0;
  91   } else if (count < 128) {
  92     r = 0;
  93     g = 255;
  94     b = 255;
  95   } else if (count < 256) {
  96     r = 0;
  97     g = 0;
  98     b = 255;
  99   } else {
 100     r = 0;
 101     g = 0;
 102     b = 0;
 103   }
 104
 105   out_args[0]->u.ival = r;
 106   out_args[1]->u.ival = g;
 107   out_args[2]->u.ival = b;
 108   return NACL_SRPC_RESULT_OK;
 109 }