platform_details.c

#include <stdio.h>
#include <stdlib.h>

#ifdef APPLE
#include <OpenCL/cl.h>
#else
#include <CL/cl.h>
#endif

void displayPlatformInfo (cl_platfrom_id id, cl_platform_info param_name, const char* paramNameAsStr) {
  cl_int error = 0;
  size_t paramSize = 0;
  error = clGetPlatformInfo (id, param_name, 0, NULL, &paramSize);
  char* moreInfo = (char*)alloca(sizeof(char) * paramSize);
  error = clGetPlatformInfo(id, param_name, paramSize, moreInfo, NULL);
  if (error != CL_SUCCESS) {
    perror("Unable to find any OpenCL platform information");
    return;
  }
  printf("%s: %s\n", paramNameAsStr, moreInfo);
}
int main() {
  /* OpenCL 1.2 data structures */
  cl_platform_id* platforms;
  /* OpenCL 1.1 scalar data types */
  cl_uint numOfPlatforms;
  cl_int error;
  /*
  Get the number of platforms
  Remember that for each vendor's SDK installed on the
  Computer, the number of available platform also
  increased. */
  error = clGetPlatformIDs(0, NULL, &numOfPlatforms);
  if(error < 0) {
  perror("Unable to find any OpenCL platforms");
  exit(1);
  }
  // Allocate memory for the number of installed platforms.
  // alloca(...) occupies some stack space but is
  // automatically freed on return
  platforms = (cl_platform_id*) alloca(sizeof(cl_platform_id) * numOfPlatforms);
  printf("Number of OpenCL platforms found: %d\n", numOfPlatforms);

  // We invoke the API 'clPlatformInfo' twice for each parameter we're trying to extract and we use the return value to create temporary data
  // structures (on the stack) to store the returned information on the second invocation.
  for (cl_unit i = 0; i < numOfPlatforms; ++i) {
    displayPlatformInfo( platform[i], CL_PLATFORM_PROFILE, "CL_PLATFORM_PROFILE");
    displayPlatformInfo( platform[i], CL_PLATFORM_VERSION, "CL_PLATFORM_VERSION");
    displayPlatformInfo( platform[i], CL_PLATFORM_VENDOR, "CL_PLATFORM_VENDOR");
    displayPlatformInfo( platform[i], CL_PLATFORM_EXTENSIONS, "CL_PLATFORM_EXTENSIONS");
  }
  return 0;
}