text: /* Issues with __local pointers (lp:918801)
  
     Copyright (c) 2012 Pekka Jääskeläinen / Tampere University of Technology
     
     Permission is hereby granted, free of charge, to any person obtaining a copy
     of this software and associated documentation files (the "Software"), to deal
     in the Software without restriction, including without limitation the rights
     to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
     copies of the Software, and to permit persons to whom the Software is
     furnished to do so, subject to the following conditions:
     
     The above copyright notice and this permission notice shall be included in
     all copies or substantial portions of the Software.
     
     THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
     IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
     FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
     AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
     LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
     OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
     THE SOFTWARE.
  */
  
  // Enable OpenCL C++ exceptions
  #define __CL_ENABLE_EXCEPTIONS
  #include <CL/cl.hpp>
  
  #include <cstdio>
  #include <cstdlib>
  #include <iostream>
  
  #include "poclu.h"
  
  #define WORK_ITEMS 2
  #define BUFFER_SIZE (WORK_ITEMS)
  
  
  static char
  kernelSourceCode[] = 
  "kernel void test_kernel (global float *a, local int *local_buf, private int scalar)\n"
  "{\n"
  "   int gid = get_local_id(0); \n"
  "   local int automatic_local_scalar; \n"
  "   local int automatic_local_buf[2];\n"
  "\n"
  "   __local int *p;\n"
  "\n"
  "   p = automatic_local_buf;\n"
  "   p[gid] = gid + scalar;\n"
  "   p = local_buf;\n"
  "   p[gid] = a[gid];\n"
  "   automatic_local_scalar = scalar;\n"
  "   barrier(CLK_LOCAL_MEM_FENCE);\n"
  "   a[gid] = automatic_local_buf[gid] + local_buf[gid] + automatic_local_scalar;\n"
  "   \n"
  "}\n";
  
  int
  main(void)
  {
      float A[BUFFER_SIZE];
  
      try {
          std::vector<cl::Platform> platformList;
  
          // Pick platform
          cl::Platform::get(&platformList);
  
          // Pick first platform
          cl_context_properties cprops[] = {
              CL_CONTEXT_PLATFORM, (cl_context_properties)(platformList[0])(), 0};
          cl::Context context(CL_DEVICE_TYPE_CPU|CL_DEVICE_TYPE_GPU, cprops);
  
          // Query the set of devices attched to the context
          std::vector<cl::Device> devices = context.getInfo<CL_CONTEXT_DEVICES>();
  
          // Create and program from source
          cl::Program::Sources sources(1, std::make_pair(kernelSourceCode, 0));
          cl::Program program(context, sources);
  
          cl_device_id dev_id = devices.at(0)();
  
          int scalar = poclu_bswap_cl_int (dev_id, 4);
  
          for (int i = 0; i < BUFFER_SIZE; ++i)
              A[i] = poclu_bswap_cl_float(dev_id, i);
  
          // Build program
          program.build(devices);
  
          cl::Buffer aBuffer = cl::Buffer(
              context, 
              CL_MEM_COPY_HOST_PTR,
              BUFFER_SIZE * sizeof(float), 
              (void *) &A[0]);
  
          cl::Buffer localBuffer = cl::Buffer(
              context, 0, BUFFER_SIZE * sizeof(int), NULL);
  
          // Create kernel object
          cl::Kernel kernel(program, "test_kernel");
  
          // Set kernel args
          kernel.setArg(0, aBuffer);
          kernel.setArg(1, localBuffer);
          kernel.setArg(2, scalar);
  
          // Create command queue
          cl::CommandQueue queue(context, devices[0], 0);
   
          // Do the work
          queue.enqueueNDRangeKernel(
              kernel, 
              cl::NullRange, 
              cl::NDRange(WORK_ITEMS),
              cl::NDRange(WORK_ITEMS));
   
          // Map aBuffer to host pointer. This enforces a sync with 
          // the host backing space, remember we choose GPU device.
          float * res = (float *) queue.enqueueMapBuffer(
              aBuffer,
              CL_TRUE, // block 
              CL_MAP_READ,
              0,
              BUFFER_SIZE * sizeof(float));
  
          res[0] = poclu_bswap_cl_float (dev_id, res[0]);
          res[1] = poclu_bswap_cl_float (dev_id, res[1]);
          bool ok = res[0] == 8 && res[1] == 10;
          if (ok) {
              return EXIT_SUCCESS;
          } else {
              std::cout << "NOK " << res[0] << " " << res[1] << std::endl;
              std::cout << "res@" << std::hex << res << std::endl;
              return EXIT_FAILURE;
          }
  
          // Finally release our hold on accessing the memory
          queue.enqueueUnmapMemObject(
              aBuffer, (void *) res);
   
          // There is no need to perform a finish on the final unmap
          // or release any objects as this all happens implicitly with
          // the C++ Wrapper API.
      } 
      catch (cl::Error err) {
           std::cerr
               << "ERROR: "
               << err.what()
               << "("
               << err.err()
               << ")"
               << std::endl;
  
           return EXIT_FAILURE;
      }
  
      return EXIT_SUCCESS;
  }
  