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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include <errno.h>
#include <CL/cl.h>
#include "clFFT.h"
/*
* Utility functions
*/
const char* OPENCL_ERROR_MSG[] = {
"CL_SUCCESS",
"CL_DEVICE_NOT_FOUND",
"CL_DEVICE_NOT_AVAILABLE",
"CL_COMPILER_NOT_AVAILABLE",
"CL_MEM_OBJECT_ALLOCATION_FAILURE",
"CL_OUT_OF_RESOURCES",
"CL_OUT_OF_HOST_MEMORY",
"CL_PROFILING_INFO_NOT_AVAILABLE",
"CL_MEM_COPY_OVERLAP",
"CL_IMAGE_FORMAT_MISMATCH",
"CL_IMAGE_FORMAT_NOT_SUPPORTED",
"CL_BUILD_PROGRAM_FAILURE",
"CL_MAP_FAILURE",
"CL_MISALIGNED_SUB_BUFFER_OFFSET",
"CL_EXEC_STATUS_ERROR_FOR_EVENTS_IN_WAIT_LIST",
/* next IDs start at 30! */
"CL_INVALID_VALUE",
"CL_INVALID_DEVICE_TYPE",
"CL_INVALID_PLATFORM",
"CL_INVALID_DEVICE",
"CL_INVALID_CONTEXT",
"CL_INVALID_QUEUE_PROPERTIES",
"CL_INVALID_COMMAND_QUEUE",
"CL_INVALID_HOST_PTR",
"CL_INVALID_MEM_OBJECT",
"CL_INVALID_IMAGE_FORMAT_DESCRIPTOR",
"CL_INVALID_IMAGE_SIZE",
"CL_INVALID_SAMPLER",
"CL_INVALID_BINARY",
"CL_INVALID_BUILD_OPTIONS",
"CL_INVALID_PROGRAM",
"CL_INVALID_PROGRAM_EXECUTABLE",
"CL_INVALID_KERNEL_NAME",
"CL_INVALID_KERNEL_DEFINITION",
"CL_INVALID_KERNEL",
"CL_INVALID_ARG_INDEX",
"CL_INVALID_ARG_VALUE",
"CL_INVALID_ARG_SIZE",
"CL_INVALID_KERNEL_ARGS",
"CL_INVALID_WORK_DIMENSION",
"CL_INVALID_WORK_GROUP_SIZE",
"CL_INVALID_WORK_ITEM_SIZE",
"CL_INVALID_GLOBAL_OFFSET",
"CL_INVALID_EVENT_WAIT_LIST",
"CL_INVALID_EVENT",
"CL_INVALID_OPERATION",
"CL_INVALID_GL_OBJECT",
"CL_INVALID_BUFFER_SIZE",
"CL_INVALID_MIP_LEVEL",
"CL_INVALID_GLOBAL_WORK_SIZE"
};
static const char* opencl_map_error(cl_int error)
{
if (error >= -14)
return OPENCL_ERROR_MSG[-error];
if (error <= -30)
return OPENCL_ERROR_MSG[-error-15];
return NULL;
}
#define CL_CHECK_ERROR(errorcode) if (errorcode != CL_SUCCESS) { \
printf("OpenCL Error %i <%s:%i>", errorcode, __FILE__, __LINE__); }
#define CL_CHECK_ERROR_EX(errorcode) if (errorcode != CL_SUCCESS) { \
printf("OpenCL Error: %s <%s:%i>", opencl_map_error(errorcode), __FILE__, __LINE__); }
void print_array(float* a, size_t n)
{
printf("[ ");
for (size_t i = 0; i < n-2; i += 2)
printf("(%2.3f, %2.3f), ", a[i], a[i+1]);
printf("(%2.3f, %2.3f) ]\n", a[n-2], a[n-1]);
}
int main(int argc, const char *argv[])
{
cl_platform_id platform;
CL_CHECK_ERROR(clGetPlatformIDs(1, &platform, NULL));
cl_device_id device;
CL_CHECK_ERROR(clGetDeviceIDs(platform, CL_DEVICE_TYPE_GPU,
1, &device, NULL));
cl_int err;
cl_context context = clCreateContext(0, 1, &device, NULL, NULL, &err);
CL_CHECK_ERROR(err);
cl_command_queue queue = clCreateCommandQueue(context, device, 0, &err);
CL_CHECK_ERROR(err);
const int N = 8;
float h_input[] = { 1.0, 0.0, 2.3, 0.0, 1.1, 0.0, 1.0, 0.0, 3.3, 0.0, 2.0, 0.0, 1.0, 0.0, 3.2, 0.0 };
float h_output[2*N];
h_output[0] = 0.0;
clFFT_Dim3 dim;
dim.x = N; dim.y = 1; dim.z = 1;
clFFT_Plan fft_plan = clFFT_CreatePlan(context, dim, clFFT_1D, clFFT_InterleavedComplexFormat, &err);
CL_CHECK_ERROR_EX(err);
if (fft_plan == NULL) {
printf("Error creating FFT plan\n");
return 255;
}
FILE *fp = fopen("plan.txt", "w");
clFFT_DumpPlan(fft_plan, fp);
fclose(fp);
cl_mem d_input = clCreateBuffer(context, CL_MEM_READ_WRITE, 2*N*sizeof(float), NULL, &err);
CL_CHECK_ERROR(err);
if (h_input == NULL) {
printf("nice\n");
}
CL_CHECK_ERROR_EX(clEnqueueWriteBuffer(queue, d_input, CL_TRUE, 0, 2*N*sizeof(float), h_input, 0, NULL, NULL));
cl_mem d_output = clCreateBuffer(context, CL_MEM_READ_WRITE, 2*N*sizeof(float), NULL, &err);
CL_CHECK_ERROR(err);
/*
* Do FFT
*/
CL_CHECK_ERROR_EX(clFFT_ExecuteInterleaved(queue, fft_plan, 2*N, clFFT_Forward, d_input, d_output, 0, NULL, NULL));
CL_CHECK_ERROR(clEnqueueReadBuffer(queue, d_output, CL_TRUE, 0, 2*N*sizeof(float), h_output, 0, NULL, NULL));
print_array(h_output, 16);
CL_CHECK_ERROR_EX(clFFT_ExecuteInterleaved(queue, fft_plan, 2*N, clFFT_Inverse, d_output, d_input, 0, NULL, NULL));
CL_CHECK_ERROR(clEnqueueReadBuffer(queue, d_input, CL_TRUE, 0, 2*N*sizeof(float), h_output, 0, NULL, NULL));
for (int i = 0; i < 16; i++)
h_output[i] /= N;
print_array(h_output, 16);
/*
* Clean up
*/
CL_CHECK_ERROR(clReleaseMemObject(d_input));
CL_CHECK_ERROR(clReleaseMemObject(d_output));
CL_CHECK_ERROR(clReleaseCommandQueue(queue));
CL_CHECK_ERROR(clReleaseContext(context));
return 0;
}
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