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Copyright ©2012 Advanced Micro Devices, Inc. All rights reserved.

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#ifndef FASTWALSHTRANSFORM_H_
#define FASTWALSHTRANSFORM_H_

#include <CL/cl.h>
#include <stdio.h>
#include <stdlib.h>
#include <assert.h>
#include <string.h>
#include <SDKCommon.hpp>
#include <SDKApplication.hpp>
#include <SDKCommandArgs.hpp>
#include <SDKFile.hpp>

/**
 * FastWalshTransform 
 * Class implements OpenCL FastWalsh Transform sample
 * Derived from SDKSample base class
 */

class FastWalshTransform : public SDKSample
{
    cl_uint                  seed;       /**< Seed value for random number generation */
    cl_double           setupTime;       /**< Time for setting up OpenCL */
    cl_double     totalKernelTime;       /**< Time for kernel execution */
    cl_double    totalProgramTime;       /**< Time for program execution */
    cl_double referenceKernelTime;       /**< Time for reference implementation */
    cl_int                 length;       /**< Length of the input array */
    cl_float               *input;       /**< Input array */
    cl_float              *output;       /**< Ouput array */
    cl_float   *verificationInput;       /**< Input array for reference implementation */
    cl_context            context;       /**< CL context */
    cl_device_id         *devices;       /**< CL device list */
    cl_mem            inputBuffer;       /**< CL memory buffer */
    cl_mem           outputBuffer;       /**< CL memory buffer */
    cl_command_queue commandQueue;       /**< CL command queue */
    cl_program            program;       /**< CL program  */
    cl_kernel              kernel;       /**< CL kernel */
    int                iterations;       /**< Number of iterations for kernel execution */
    streamsdk::SDKDeviceInfo deviceInfo;        /**< Structure to store device information*/
    streamsdk::KernelWorkGroupInfo kernelInfo; /**< Class object to hold KernelWorkgroup Info */

public:
    /** 
     * Constructor 
     * Initialize member variables
     * @param name name of sample (string)
     */
    FastWalshTransform(std::string name)
        : SDKSample(name){
            seed = 123;
            length = 1024;
            input = NULL;
            verificationInput = NULL;
            setupTime = 0;
            totalKernelTime = 0;
            iterations = 1;
        }

    /**
     * Constructor 
     * Initialize member variables
     * @param name name of sample (const char*)
     */
    FastWalshTransform(const char* name)
        : SDKSample(name){
            seed = 123;
            length = 1024;
            input = NULL;
            verificationInput = NULL;
            setupTime = 0;
            totalKernelTime = 0;
            iterations = 1;
        }

    /**
     * Allocate and initialize host memory array with random values
     * @return SDK_SUCCESS on success and SDK_FAILURE on failure
     */
    int setupFastWalshTransform();

    /**
     * Override from SDKSample, Generate binary image of given kernel 
     * and exit application
     * @return SDK_SUCCESS on success and SDK_FAILURE on failure
     */
    int genBinaryImage();

    /**
     * OpenCL related initialisations. 
     * Set up Context, Device list, Command Queue, Memory buffers
     * Build CL kernel program executable
     * @return SDK_SUCCESS on success and SDK_FAILURE on failure
     */
    int setupCL();

    /**
     * Set values for kernels' arguments, enqueue calls to the kernels
     * on to the command queue, wait till end of kernel execution.
     * Get kernel start and end time if timing is enabled
     * @return SDK_SUCCESS on success and SDK_FAILURE on failure
     */
    int runCLKernels();

    /**
     * Reference CPU implementation of inplace FastWalsh Transform
     * for performance comparison 
     * @param input input array which also stores the output 
     * @param length length of the array
     */
    void fastWalshTransformCPUReference(
        cl_float * input, 
        const cl_uint length);

    /**
     * Override from SDKSample. Print sample stats.
     */
    void printStats();

    /**
     * Override from SDKSample. Initialize 
     * command line parser, add custom options
     * @return SDK_SUCCESS on success and SDK_FAILURE on failure
     */
    int initialize();

    /**
     * Override from SDKSample, adjust width and height 
     * of execution domain, perform all sample setup
     * @return SDK_SUCCESS on success and SDK_FAILURE on failure
     */
    int setup();

    /**
     * Override from SDKSample
     * Run OpenCL FastWalsh Transform 
     * @return SDK_SUCCESS on success and SDK_FAILURE on failure
     */
    int run();

    /**
     * Override from SDKSample
     * Cleanup memory allocations
     * @return SDK_SUCCESS on success and SDK_FAILURE on failure
     */
    int cleanup();

    /**
     * Override from SDKSample
     * Verify against reference implementation
     * @return SDK_SUCCESS on success and SDK_FAILURE on failure
     */
    int verifyResults();
};
#endif