ocl_utilities.c

   1 #include <stdio.h>
   2 #include <stdlib.h>
   3
   4 #if defined(__APPLE__)
   5 #include <OpenCL/opencl.h>
   6 #else
   7 #include <CL/opencl.h>
   8 #endif
   9
  10 /* Return the OpenCL error string for a given error number.
  11  */
  12 const char *opencl_error_string(cl_int error)
  13 {
  14         int errorCount;
  15         int index;
  16
  17         static const char *errorString[] = {
  18                 [CL_SUCCESS] = "CL_SUCCESS",
  19                 [-CL_DEVICE_NOT_FOUND] = "CL_DEVICE_NOT_FOUND",
  20                 [-CL_DEVICE_NOT_AVAILABLE] = "CL_DEVICE_NOT_AVAILABLE",
  21                 [-CL_COMPILER_NOT_AVAILABLE] = "CL_COMPILER_NOT_AVAILABLE",
  22                 [-CL_MEM_OBJECT_ALLOCATION_FAILURE] =
  23                         "CL_MEM_OBJECT_ALLOCATION_FAILURE",
  24                 [-CL_OUT_OF_RESOURCES] = "CL_OUT_OF_RESOURCES",
  25                 [-CL_OUT_OF_HOST_MEMORY] = "CL_OUT_OF_HOST_MEMORY",
  26                 [-CL_PROFILING_INFO_NOT_AVAILABLE] =
  27                         "CL_PROFILING_INFO_NOT_AVAILABLE",
  28                 [-CL_MEM_COPY_OVERLAP] = "CL_MEM_COPY_OVERLAP",
  29                 [-CL_IMAGE_FORMAT_MISMATCH] = "CL_IMAGE_FORMAT_MISMATCH",
  30                 [-CL_IMAGE_FORMAT_NOT_SUPPORTED] =
  31                         "CL_IMAGE_FORMAT_NOT_SUPPORTED",
  32                 [-CL_BUILD_PROGRAM_FAILURE] = "CL_BUILD_PROGRAM_FAILURE",
  33                 [-CL_MAP_FAILURE] = "CL_MAP_FAILURE",
  34                 [-CL_INVALID_VALUE] = "CL_INVALID_VALUE",
  35                 [-CL_INVALID_DEVICE_TYPE] = "CL_INVALID_DEVICE_TYPE",
  36                 [-CL_INVALID_PLATFORM] = "CL_INVALID_PLATFORM",
  37                 [-CL_INVALID_DEVICE] = "CL_INVALID_DEVICE",
  38                 [-CL_INVALID_CONTEXT] = "CL_INVALID_CONTEXT",
  39                 [-CL_INVALID_QUEUE_PROPERTIES] = "CL_INVALID_QUEUE_PROPERTIES",
  40                 [-CL_INVALID_COMMAND_QUEUE] = "CL_INVALID_COMMAND_QUEUE",
  41                 [-CL_INVALID_HOST_PTR] = "CL_INVALID_HOST_PTR",
  42                 [-CL_INVALID_MEM_OBJECT] = "CL_INVALID_MEM_OBJECT",
  43                 [-CL_INVALID_IMAGE_FORMAT_DESCRIPTOR] =
  44                         "CL_INVALID_IMAGE_FORMAT_DESCRIPTOR",
  45                 [-CL_INVALID_IMAGE_SIZE] = "CL_INVALID_IMAGE_SIZE",
  46                 [-CL_INVALID_SAMPLER] = "CL_INVALID_SAMPLER",
  47                 [-CL_INVALID_BINARY] = "CL_INVALID_BINARY",
  48                 [-CL_INVALID_BUILD_OPTIONS] = "CL_INVALID_BUILD_OPTIONS",
  49                 [-CL_INVALID_PROGRAM] = "CL_INVALID_PROGRAM",
  50                 [-CL_INVALID_PROGRAM_EXECUTABLE] =
  51                         "CL_INVALID_PROGRAM_EXECUTABLE",
  52                 [-CL_INVALID_KERNEL_NAME] = "CL_INVALID_KERNEL_NAME",
  53                 [-CL_INVALID_KERNEL_DEFINITION] =
  54                         "CL_INVALID_KERNEL_DEFINITION",
  55                 [-CL_INVALID_KERNEL] = "CL_INVALID_KERNEL",
  56                 [-CL_INVALID_ARG_INDEX] = "CL_INVALID_ARG_INDEX",
  57                 [-CL_INVALID_ARG_VALUE] = "CL_INVALID_ARG_VALUE",
  58                 [-CL_INVALID_ARG_SIZE] = "CL_INVALID_ARG_SIZE",
  59                 [-CL_INVALID_KERNEL_ARGS] = "CL_INVALID_KERNEL_ARGS",
  60                 [-CL_INVALID_WORK_DIMENSION] = "CL_INVALID_WORK_DIMENSION",
  61                 [-CL_INVALID_WORK_GROUP_SIZE] = "CL_INVALID_WORK_GROUP_SIZE",
  62                 [-CL_INVALID_WORK_ITEM_SIZE] = "CL_INVALID_WORK_ITEM_SIZE",
  63                 [-CL_INVALID_GLOBAL_OFFSET] = "CL_INVALID_GLOBAL_OFFSET",
  64                 [-CL_INVALID_EVENT_WAIT_LIST] = "CL_INVALID_EVENT_WAIT_LIST",
  65                 [-CL_INVALID_EVENT] = "CL_INVALID_EVENT",
  66                 [-CL_INVALID_OPERATION] = "CL_INVALID_OPERATION",
  67                 [-CL_INVALID_GL_OBJECT] = "CL_INVALID_GL_OBJECT",
  68                 [-CL_INVALID_BUFFER_SIZE] = "CL_INVALID_BUFFER_SIZE",
  69                 [-CL_INVALID_MIP_LEVEL] = "CL_INVALID_MIP_LEVEL",
  70                 [-CL_INVALID_GLOBAL_WORK_SIZE] = "CL_INVALID_GLOBAL_WORK_SIZE",
  71                 [-CL_INVALID_PROPERTY] = "CL_INVALID_PROPERTY"
  72         };
  73
  74         errorCount = sizeof(errorString) / sizeof(errorString[0]);
  75         index = -error;
  76
  77         return (index >= 0 && index < errorCount) ?
  78                 errorString[index] : "Unspecified Error";
  79 }
  80
  81 /* Find a GPU or a CPU associated with the first available platform.
  82  * If use_gpu is set, then this function first tries to look for a GPU
  83  * in the first available platform.
  84  * If this fails or if use_gpu is not set, then it tries to use the CPU.
  85  */
  86 cl_device_id opencl_create_device(int use_gpu)
  87 {
  88         cl_platform_id platform;
  89         cl_device_id dev;
  90         int err;
  91
  92         err = clGetPlatformIDs(1, &platform, NULL);
  93         if (err < 0) {
  94                 fprintf(stderr, "Error %s while looking for a platform.\n",
  95                                 opencl_error_string(err));
  96                 exit(1);
  97         }
  98
  99         err = CL_DEVICE_NOT_FOUND;
 100         if (use_gpu)
 101                 err = clGetDeviceIDs(platform, CL_DEVICE_TYPE_GPU, 1, &dev,
 102                                 NULL);
 103         if (err == CL_DEVICE_NOT_FOUND)
 104                 err = clGetDeviceIDs(platform, CL_DEVICE_TYPE_CPU, 1, &dev,
 105                                 NULL);
 106         if (err < 0) {
 107                 fprintf(stderr, "Error %s while looking for a device.\n",
 108                                 opencl_error_string(err));
 109                 exit(1);
 110         }
 111         return dev;
 112 }
 113
 114 /* Create an OpenCL program from a source file and compile it.
 115  */
 116 cl_program opencl_build_program(cl_context ctx, cl_device_id dev,
 117         const char* filename, const char* opencl_options)
 118 {
 119         cl_program program;
 120         FILE *program_file;
 121         char *program_source, *program_log;
 122         size_t program_size, log_size, read;
 123         int err;
 124
 125         program_file = fopen(filename, "r");
 126         if (program_file == NULL) {
 127                 fprintf(stderr, "Could not find the source file.\n");
 128                 exit(1);
 129         }
 130         fseek(program_file, 0, SEEK_END);
 131         program_size = ftell(program_file);
 132         rewind(program_file);
 133         program_source = (char *) malloc(program_size + 1);
 134         program_source[program_size] = '\0';
 135         read = fread(program_source, sizeof(char), program_size, program_file);
 136         if (read != program_size) {
 137                 fprintf(stderr, "Error while reading the kernel.\n");
 138                 exit(1);
 139         }
 140         fclose(program_file);
 141
 142         program = clCreateProgramWithSource(ctx, 1,
 143                 (const char **)&program_source, &program_size, &err);
 144         if (err < 0) {
 145                 fprintf(stderr, "Could not create the program\n");
 146                 exit(1);
 147         }
 148         free(program_source);
 149         err = clBuildProgram(program, 0, NULL, opencl_options, NULL, NULL);
 150         if (err < 0) {
 151                 fprintf(stderr, "Could not build the program.\n");
 152                 clGetProgramBuildInfo(program, dev, CL_PROGRAM_BUILD_LOG, 0,
 153                                 NULL, &log_size);
 154                 program_log = (char *) malloc(log_size + 1);
 155                 program_log[log_size] = '\0';
 156                 clGetProgramBuildInfo(program, dev, CL_PROGRAM_BUILD_LOG,
 157                                 log_size + 1, program_log, NULL);
 158                 fprintf(stderr, "%s\n", program_log);
 159                 free(program_log);
 160                 exit(1);
 161         }
 162         return program;
 163 }