//
// Copyright (c) 2017 The Khronos Group Inc.
// 
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//    http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
#include "common.h"

const cl_mem_flags flag_set[] = {
  CL_MEM_READ_WRITE,
  CL_MEM_WRITE_ONLY,
  CL_MEM_READ_ONLY,
  CL_MEM_READ_WRITE | CL_MEM_SVM_FINE_GRAIN_BUFFER,
  CL_MEM_WRITE_ONLY | CL_MEM_SVM_FINE_GRAIN_BUFFER,
  CL_MEM_READ_ONLY | CL_MEM_SVM_FINE_GRAIN_BUFFER,
  CL_MEM_READ_WRITE | CL_MEM_SVM_FINE_GRAIN_BUFFER | CL_MEM_SVM_ATOMICS,
  CL_MEM_WRITE_ONLY | CL_MEM_SVM_FINE_GRAIN_BUFFER | CL_MEM_SVM_ATOMICS,
  CL_MEM_READ_ONLY | CL_MEM_SVM_FINE_GRAIN_BUFFER | CL_MEM_SVM_ATOMICS,
  0
};
const char* flag_set_names[] = {
  "CL_MEM_READ_WRITE",
  "CL_MEM_WRITE_ONLY",
  "CL_MEM_READ_ONLY",
  "CL_MEM_READ_WRITE | CL_MEM_SVM_FINE_GRAIN_BUFFER",
  "CL_MEM_WRITE_ONLY | CL_MEM_SVM_FINE_GRAIN_BUFFER",
  "CL_MEM_READ_ONLY | CL_MEM_SVM_FINE_GRAIN_BUFFER",
  "CL_MEM_READ_WRITE | CL_MEM_SVM_FINE_GRAIN_BUFFER | CL_MEM_SVM_ATOMICS",
  "CL_MEM_WRITE_ONLY | CL_MEM_SVM_FINE_GRAIN_BUFFER | CL_MEM_SVM_ATOMICS",
  "CL_MEM_READ_ONLY | CL_MEM_SVM_FINE_GRAIN_BUFFER | CL_MEM_SVM_ATOMICS",
  "0"
};


int test_svm_allocate_shared_buffer(cl_device_id deviceID, cl_context context2, cl_command_queue queue, int num_elements)
{
  clContextWrapper    context = NULL;
  clProgramWrapper    program = NULL;
  cl_uint     num_devices = 0;
  cl_int      err = CL_SUCCESS;
  clCommandQueueWrapper queues[MAXQ];

  cl_device_svm_capabilities caps;
  err = clGetDeviceInfo(deviceID, CL_DEVICE_SVM_CAPABILITIES, sizeof(cl_device_svm_capabilities), &caps, NULL);
  test_error(err,"clGetDeviceInfo failed for CL_DEVICE_SVM_CAPABILITIES");

  // under construction...
  err = create_cl_objects(deviceID, NULL, &context, &program, &queues[0], &num_devices, CL_DEVICE_SVM_COARSE_GRAIN_BUFFER);
  if(err) return -1;

  size_t size = 1024;

  // iteration over flag combos
  int num_flags = sizeof(flag_set)/sizeof(cl_mem_flags);
  for(int i = 0; i < num_flags; i++)
  {
    if (((flag_set[i] & CL_MEM_SVM_FINE_GRAIN_BUFFER) != 0 && (caps & CL_DEVICE_SVM_FINE_GRAIN_BUFFER) == 0)
        || ((flag_set[i] & CL_MEM_SVM_ATOMICS) != 0 && (caps & CL_DEVICE_SVM_ATOMICS) == 0))
    {
      log_info("Skipping clSVMalloc with flags: %s\n", flag_set_names[i]);
      continue;
    }

    log_info("Testing clSVMalloc with flags: %s\n", flag_set_names[i]);
    cl_char *pBufData1 = (cl_char*) clSVMAlloc(context, flag_set[i], size, 0);
    if(pBufData1 == NULL)
    {
      log_error("SVMalloc returned NULL");
      return -1;
    }

    {
      clMemWrapper buf = clCreateBuffer(context, CL_MEM_USE_HOST_PTR, size, pBufData1, &err);
      test_error(err,"clCreateBuffer failed");

      cl_char *pBufData2 = NULL;
      cl_uint flags = CL_MAP_READ | CL_MAP_READ;
      if(flag_set[i] & CL_MEM_HOST_READ_ONLY) flags ^= CL_MAP_WRITE;
      if(flag_set[i] & CL_MEM_HOST_WRITE_ONLY) flags ^= CL_MAP_READ;

      if(!(flag_set[i] & CL_MEM_HOST_NO_ACCESS))
      {
        pBufData2 = (cl_char*) clEnqueueMapBuffer(queues[0], buf, CL_TRUE, flags, 0, size, 0, NULL,NULL, &err);
        test_error(err, "clEnqueueMapBuffer failed");

        if(pBufData2 != pBufData1 || NULL == pBufData1)
        {
          log_error("SVM pointer returned by clEnqueueMapBuffer doesn't match pointer returned by clSVMalloc");
          return -1;
        }
        err = clEnqueueUnmapMemObject(queues[0], buf, pBufData2, 0, NULL, NULL);
        test_error(err, "clEnqueueUnmapMemObject failed");
        err = clFinish(queues[0]);
        test_error(err, "clFinish failed");
      }
    }

    clSVMFree(context, pBufData1);
  }

  return 0;
}