title: how to implement double pointer with OpenCl rand with android JNI
body: <p>I am currently using an implementation of <code>OpenCL</code> bound with <code>JNI</code> interface to my android app. </p>
  
  <p>When the kernel is loaded </p>
  
  <pre><code>__kernel void someFunction( __global double* out,
  </code></pre>
  
  <p>I get this error : </p>
  
  <pre><code> error: use of type 'double' requires cl_khr_fp64 extension to be enabled
      __global double* weight_coef,
  </code></pre>
  
  <p>I tried to replace it by float and it works but I want to avoid that ! </p>