module clFFT;

import derelict.opencl.cl;

enum clfftVersionMajor = 2;
enum clfftVersionMinor = 1;
enum clfftVersionPatch = 0;

enum clfftStatus
{
    CLFFT_INVALID_GLOBAL_WORK_SIZE = CL_INVALID_GLOBAL_WORK_SIZE,
    CLFFT_INVALID_MIP_LEVEL = CL_INVALID_MIP_LEVEL,
    CLFFT_INVALID_BUFFER_SIZE = CL_INVALID_BUFFER_SIZE,
    CLFFT_INVALID_GL_OBJECT = CL_INVALID_GL_OBJECT,
    CLFFT_INVALID_OPERATION = CL_INVALID_OPERATION,
    CLFFT_INVALID_EVENT = CL_INVALID_EVENT,
    CLFFT_INVALID_EVENT_WAIT_LIST = CL_INVALID_EVENT_WAIT_LIST,
    CLFFT_INVALID_GLOBAL_OFFSET = CL_INVALID_GLOBAL_OFFSET,
    CLFFT_INVALID_WORK_ITEM_SIZE = CL_INVALID_WORK_ITEM_SIZE,
    CLFFT_INVALID_WORK_GROUP_SIZE = CL_INVALID_WORK_GROUP_SIZE,
    CLFFT_INVALID_WORK_DIMENSION = CL_INVALID_WORK_DIMENSION,
    CLFFT_INVALID_KERNEL_ARGS = CL_INVALID_KERNEL_ARGS,
    CLFFT_INVALID_ARG_SIZE = CL_INVALID_ARG_SIZE,
    CLFFT_INVALID_ARG_VALUE = CL_INVALID_ARG_VALUE,
    CLFFT_INVALID_ARG_INDEX = CL_INVALID_ARG_INDEX,
    CLFFT_INVALID_KERNEL = CL_INVALID_KERNEL,
    CLFFT_INVALID_KERNEL_DEFINITION = CL_INVALID_KERNEL_DEFINITION,
    CLFFT_INVALID_KERNEL_NAME = CL_INVALID_KERNEL_NAME,
    CLFFT_INVALID_PROGRAM_EXECUTABLE = CL_INVALID_PROGRAM_EXECUTABLE,
    CLFFT_INVALID_PROGRAM = CL_INVALID_PROGRAM,
    CLFFT_INVALID_BUILD_OPTIONS = CL_INVALID_BUILD_OPTIONS,
    CLFFT_INVALID_BINARY = CL_INVALID_BINARY,
    CLFFT_INVALID_SAMPLER = CL_INVALID_SAMPLER,
    CLFFT_INVALID_IMAGE_SIZE = CL_INVALID_IMAGE_SIZE,
    CLFFT_INVALID_IMAGE_FORMAT_DESCRIPTOR = CL_INVALID_IMAGE_FORMAT_DESCRIPTOR,
    CLFFT_INVALID_MEM_OBJECT = CL_INVALID_MEM_OBJECT,
    CLFFT_INVALID_HOST_PTR = CL_INVALID_HOST_PTR,
    CLFFT_INVALID_COMMAND_QUEUE = CL_INVALID_COMMAND_QUEUE,
    CLFFT_INVALID_QUEUE_PROPERTIES = CL_INVALID_QUEUE_PROPERTIES,
    CLFFT_INVALID_CONTEXT = CL_INVALID_CONTEXT,
    CLFFT_INVALID_DEVICE = CL_INVALID_DEVICE,
    CLFFT_INVALID_PLATFORM = CL_INVALID_PLATFORM,
    CLFFT_INVALID_DEVICE_TYPE = CL_INVALID_DEVICE_TYPE,
    CLFFT_INVALID_VALUE = CL_INVALID_VALUE,
    CLFFT_MAP_FAILURE = CL_MAP_FAILURE,
    CLFFT_BUILD_PROGRAM_FAILURE = CL_BUILD_PROGRAM_FAILURE,
    CLFFT_IMAGE_FORMAT_NOT_SUPPORTED = CL_IMAGE_FORMAT_NOT_SUPPORTED,
    CLFFT_IMAGE_FORMAT_MISMATCH = CL_IMAGE_FORMAT_MISMATCH,
    CLFFT_MEM_COPY_OVERLAP = CL_MEM_COPY_OVERLAP,
    CLFFT_PROFILING_INFO_NOT_AVAILABLE = CL_PROFILING_INFO_NOT_AVAILABLE,
    CLFFT_OUT_OF_HOST_MEMORY = CL_OUT_OF_HOST_MEMORY,
    CLFFT_OUT_OF_RESOURCES = CL_OUT_OF_RESOURCES,
    CLFFT_MEM_OBJECT_ALLOCATION_FAILURE = CL_MEM_OBJECT_ALLOCATION_FAILURE,
    CLFFT_COMPILER_NOT_AVAILABLE = CL_COMPILER_NOT_AVAILABLE,
    CLFFT_DEVICE_NOT_AVAILABLE = CL_DEVICE_NOT_AVAILABLE,
    CLFFT_DEVICE_NOT_FOUND = CL_DEVICE_NOT_FOUND,
    CLFFT_SUCCESS = CL_SUCCESS,
    //-------------------------- Extended status codes for clfft 
    //----------------------------------------
    CLFFT_BUGCHECK = 4*1024, /*!< Bugcheck. */
    CLFFT_NOTIMPLEMENTED, /*!< Functionality is not implemented yet. */
    CLFFT_TRANSPOSED_NOTIMPLEMENTED, /*!< Transposed functionality is not implemented for this transformation. */
    CLFFT_FILE_NOT_FOUND, /*!< Tried to open an existing file on the host system, but failed. */
    CLFFT_FILE_CREATE_FAILURE, /*!< Tried to create a file on the host system, but failed. */
    CLFFT_VERSION_MISMATCH, /*!< Version conflict between client and library. */
    CLFFT_INVALID_PLAN, /*!< Requested plan could not be found. */
    CLFFT_DEVICE_NO_DOUBLE, /*!< Double precision not supported on this device. */
    CLFFT_DEVICE_MISMATCH, /*!< Attempt to run on a device using a plan baked for a different device. */
    CLFFT_ENDSTATUS /* This value will always be last, and marks the length of clfftStatus. */
}
mixin FreeEnumMembers!clfftStatus;

mixin template FreeEnumMembers(T)
    if(is(T == enum))
{
    mixin({
            string s;
            foreach(member; __traits(allMembers, T))
            {
                s ~= "enum T " ~ member ~ " = T." ~ member ~ ",\n";
            }
            return s;
            }());
}

/*! @brief The dimension of the input and output buffers that will be fed into all FFT 
transforms */
enum clfftDim
{
    CLFFT_1D = 1,	/*!< 1 Dimensional FFT transform (default). */
    CLFFT_2D, /*!< 2 Dimensional FFT transform. */
    CLFFT_3D, /*!< 3 Dimensional FFT transform. */
    ENDDIMENSION /*!< This value will always be last, and marks the length of clfftDim. */
}
mixin FreeEnumMembers!clfftDim;

/*! @brief These are the expected layouts of the buffers */
enum clfftLayout
{
    CLFFT_COMPLEX_INTERLEAVED = 1,	/*!< An array of complex numbers, with real and 
                                          imaginary components together (default). */
    CLFFT_COMPLEX_PLANAR, /*!< Arrays of real componets and arrays of imaginary components that 
                                  have been seperated out. */
    CLFFT_HERMITIAN_INTERLEAVED, /*!< Compressed form of complex numbers; complex-conjugates not 
                                          stored, real and imaginary components in same array. */
    CLFFT_HERMITIAN_PLANAR, /*!< Compressed form of complex numbers; complex-conjugates not stored, 
                                  real and imaginary components in separate arrays. */
    CLFFT_REAL, /*!< An array of real numbers, with no corresponding imaginary components. */
    ENDLAYOUT /*!< This value will always be last, and marks the length of clfftLayout. */
}
mixin AnonymousEnum!clfftLayout;

/*! @brief This is the expected precision of each FFT.
 */
enum clfftPrecision
{
    CLFFT_SINGLE = 1,	/*!< An array of complex numbers, with real and imaginary components as 
                                  floats (default). */
    CLFFT_DOUBLE, /*!< An array of complex numbers, with real and imaginary components as 
                          doubles. */
    CLFFT_SINGLE_FAST, /*!< Faster implementation preferred. */
    CLFFT_DOUBLE_FAST, /*!< Faster implementation preferred. */
    ENDPRECISION /*!< This value will always be last, and marks the length of clfftPrecision. */
}
mixin AnonymousEnum!clfftPrecision;

/*! @brief What is the expected direction of each FFT, time or the frequency domains */
enum clfftDirection
{
    CLFFT_FORWARD = -1,	/*!< FFT transform from the time to the frequency domain. */
    CLFFT_BACKWARD = 1,	/*!< FFT transform from the frequency to the time domain. */
    CLFFT_MINUS = -1,	/*!< Alias for the forward transform. */
    CLFFT_PLUS = 1,	/*!< Alias for the backward transform. */
    ENDDIRECTION /*!< This value will always be last, and marks the length of clfftDirection. */
}
mixin AnonymousEnum!clfftDirection;

/*! @brief Are the input buffers overwritten with the results */
enum clfftResultLocation
{
    CLFFT_INPLACE = 1,	/*!< The input and output buffers are the same (default). */
    CLFFT_OUTOFPLACE, /*!< Seperate input and output buffers. */
    ENDPLACE /*!< This value will always be last, and marks the length of clfftPlaceness. */
}
mixin AnonymousEnum!clfftResultLocation;

/*! @brief This determines whether the result is returned in original order. It is valid only 
  for
  dimensions greater than 1. */
enum clfftResultTransposed {
    CLFFT_NOTRANSPOSE = 1, /*!< The results are returned in the original preserved order (default) 
                                 */
    CLFFT_TRANSPOSED, /*!< The result is transposed where transpose kernel is supported 
                          (possibly faster) */
    ENDTRANSPOSED /*!< This value will always be last, and marks the length of 
                          clfftResultTransposed */
}
mixin AnonymousEnum!clfftResultTransposed;

/*! BitMasks to be used with clfftSetupData.debugFlags */
enum CLFFT_DUMP_PROGRAMS = 0x1;

/*! @brief Data structure that can be passed to clfftSetup() to control the behavior of the FFT 
runtime
* @details This structure contains values that can be initialized before instantiation of the 
FFT runtime
* with ::clfftSetup(). To initialize this structure, pass a pointer to a user struct to 
::clfftInitSetupData(),
* which will clear the structure and set the version member variables to the current values.
*/
struct clfftSetupData
{
    cl_uint major; /*!< Major version number of the project; signifies major API changes. */
    cl_uint minor; /*!< Minor version number of the project; minor API changes that could break 
                          backwards compatibility. */
    cl_uint patch; /*!< Patch version number of the project; Always incrementing number, signifies 
                          change over time. */
    
    /*! Bitwise flags that control the behavior of library debug logic. */
    cl_ulong debugFlags; /*! This should be set to zero, except when debugging the clfft library.
                          * <p> debugFlags can be set to CLFFT_DUMP_PROGRAMS, in which case the dynamically generated 
                          OpenCL kernels will
                          * be written to text files in the current working directory. These files will have a *.cl 
                          suffix.
                          */
}

/*! @brief An abstract handle to the object that represents the state of the FFT(s) */
alias clfftPlanHandle = size_t;

extern(C):

/*! @brief Initialize an clfftSetupData struct for the client
 * @details clfftSetupData is passed to clfftSetup to control behavior of the FFT runtime
 * @param[out] setupData Data structure is cleared, initialized with version information and 
 default values
 * @return Enum describing error condition; superset of OpenCL error codes
 */
clfftStatus clfftInitSetupData(clfftSetupData* setupData)
{
    setupData.major = clfftVersionMajor;
    setupData.minor = clfftVersionMinor;
    setupData.patch = clfftVersionPatch;
    setupData.debugFlags = 0;
    
    return CLFFT_SUCCESS;
}

/*! @brief Initialize internal FFT resources.
 * @details AMD's FFT implementation caches kernels, programs and buffers for its internal use.
 * @param[in] setupData Data structure that can be passed into the setup routine to control FFT 
 generation behavior
 * and debug functionality
 * @return Enum describing error condition; superset of OpenCL error codes
 */
clfftStatus clfftSetup(const clfftSetupData* setupData);

/*! @brief Release all internal resources.
 * @details Call when client is done with this FFT library, allowing the library to destroy all 
 resources it has cached
 * @return Enum describing error condition; superset of OpenCL error codes
 */
clfftStatus clfftTeardown();

/*! @brief Query the FFT library for version information
 * @details Return the major, minor and patch version numbers associated with this FFT library
 * @param[out] major Major functionality change
 * @param[out] minor Minor functionality change
 * @param[out] patch Bug fixes, documentation changes, no new features introduced
 * @return Enum describing error condition; superset of OpenCL error codes
 */
clfftStatus clfftGetVersion(cl_uint* major, cl_uint* minor, cl_uint* patch);

/*! @brief Create a plan object initialized entirely with default values.
 * @details A plan is a repository of state for calculating FFT's. Allows the runtime to 
 pre-calculate kernels, programs
 * and buffers and associate them with buffers of specified dimensions.
 * @param[out] plHandle Handle to the newly created plan
 * @param[in] context Client is responsible for providing an OpenCL context for the plan
 * @param[in] dim The dimensionality of the FFT transform; describes how many elements are in 
 the array
 * @param[in] clLengths An array of lengths, of size 'dim'. Each value describes the length of 
 additional dimensions
 * @return Enum describing error condition; superset of OpenCL error codes
 */
clfftStatus clfftCreateDefaultPlan(clfftPlanHandle* plHandle, cl_context context, 
        const clfftDim dim,
        const size_t* clLengths);

/*! @brief Create a copy of an existing plan.
 * @details This API allows a client to create a new plan based upon an existing plan. This is a 
 convenience function
 * provided for quickly creating plans that are similar, but may differ slightly.
 * @param[out] out_plHandle Handle to the newly created plan that is based on in_plHandle
 * @param[in] new_context Client is responsible for providing a new context for the new plan
 * @param[in] in_plHandle Handle to a plan to be copied, previously created
 * @return Enum describing error condition; superset of OpenCL error codes
 */
clfftStatus clfftCopyPlan(clfftPlanHandle* out_plHandle, cl_context new_context, 
        clfftPlanHandle in_plHandle);

/*! @brief Prepare the plan for execution.
 * @details After all plan parameters are set, the client has the option of 'baking' the plan, 
 which tells the runtime that
 * no more changes to the plan's parameters are expected, and the OpenCL kernels should be 
 compiled. This optional function
 * allows the client application to perform this function when the application is being 
 initialized instead of on the first
 * execution.
 * At this point, the clfft runtime will apply all implimented optimizations, possibly including
 * running kernel experiments on the devices in the plan context.
 * <p> Users should assume that this function will take a long time to execute. If a plan is not 
 baked before being executed,
 * users should assume that the first call to clfftEnqueueTransform will take a long time to 
 execute.
 * <p> If any significant parameter of a plan is changed after the plan is baked (by a 
 subsequent call to one of
 * the clfftSetPlan____ functions), that will not be considered an error. Instead, the plan will 
 revert back to
 * the unbaked state, discarding the benefits of the baking operation.
 * @param[in] plHandle Handle to a plan previously created
 * @param[in] numQueues Number of command queues in commQueueFFT; 0 is a valid value, in which 
 case client does not want
 * the runtime to run load experiments and only pre-calculate state information
 * @param[in] commQueueFFT An array of cl_command_queues created by the client; the command 
 queues must be a proper subset of
 * the devices included in the plan context
 * @param[in] pfn_notify A function pointer to a notification routine. The notification routine 
 is a callback function that
 * an application can register and which will be called when the program executable has been 
 built (successfully or unsuccessfully).
 * Currently, this parameter MUST be NULL or nullptr.
 * @param[in] user_data Passed as an argument when pfn_notify is called.
 * Currently, this parameter MUST be NULL or nullptr.
 * @return Enum describing error condition; superset of OpenCL error codes
 */
clfftStatus clfftBakePlan(clfftPlanHandle plHandle, cl_uint numQueues, 
        cl_command_queue* commQueueFFT,
        void function(clfftPlanHandle plHandle, void* user_data) pfn_notify, void* user_data);

/*! @brief Release the resources of a plan.
 * @details A plan may include kernels, programs and buffers associated with it that consume 
 memory. When a plan
 * is not needed anymore, the client should release the plan.
 * @param[in,out] plHandle Handle to a plan previously created
 * @return Enum describing error condition; superset of OpenCL error codes
 */
clfftStatus clfftDestroyPlan(clfftPlanHandle* plHandle);

/*! @brief Retrieve the OpenCL context of a previously created plan.
 * @details User should pass a reference to an cl_context variable, which will be changed to 
 point to a
 * context set in the specified plan.
 * @param[in] plHandle Handle to a plan previously created
 * @param[out] context Reference to user allocated cl_context, which will point to context set 
 in plan
 * @return Enum describing error condition; superset of OpenCL error codes
 */
clfftStatus clfftGetPlanContext(const clfftPlanHandle plHandle, cl_context* 
        context);

/*! @brief Retrieve the floating point precision of the FFT data
 * @details User should pass a reference to an clfftPrecision variable, which will be set to the
 * precision of the FFT complex data in the plan.
 * @param[in] plHandle Handle to a plan previously created
 * @param[out] precision Reference to user clfftPrecision enum
 * @return Enum describing error condition; superset of OpenCL error codes
 */
clfftStatus clfftGetPlanPrecision(const clfftPlanHandle plHandle, clfftPrecision* 
        precision);

/*! @brief Set the floating point precision of the FFT data
 * @details Set the plan property which will be the precision of the FFT complex data in the 
 plan.
 * @param[in] plHandle Handle to a plan previously created
 * @param[in] precision Reference to user clfftPrecision enum
 * @return Enum describing error condition; superset of OpenCL error codes
 */
clfftStatus clfftSetPlanPrecision(clfftPlanHandle plHandle, clfftPrecision 
        precision);

/*! @brief Retrieve the scaling factor that should be applied to the FFT data
 * @details User should pass a reference to an cl_float variable, which will be set to the
 * floating point scaling factor that will be multiplied across the FFT data.
 * @param[in] plHandle Handle to a plan previously created
 * @param[in] dir Which direction does the scaling factor apply to
 * @param[out] scale Reference to user cl_float variable
 * @return Enum describing error condition; superset of OpenCL error codes
 */
clfftStatus clfftGetPlanScale(const clfftPlanHandle plHandle, clfftDirection dir, 
        cl_float* scale);

/*! @brief Set the scaling factor that should be applied to the FFT data
 * @details Set the plan property which will be the floating point scaling factor that will be
 * multiplied across the FFT data.
 * @param[in] plHandle Handle to a plan previously created
 * @param[in] dir Which direction does the scaling factor apply to
 * @param[in] scale Reference to user cl_float variable
 * @return Enum describing error condition; superset of OpenCL error codes
 */
clfftStatus clfftSetPlanScale(clfftPlanHandle plHandle, clfftDirection dir, 
        cl_float scale);

/*! @brief Retrieve the number of discrete arrays that this plan can handle concurrently
 * @details User should pass a reference to an cl_uint variable, which will be set to the
 * number of discrete arrays (1D or 2D) that will be batched together for this plan
 * @param[in] plHandle Handle to a plan previously created
 * @param[out] batchSize How many discrete number of FFT's are to be performed
 * @return Enum describing error condition; superset of OpenCL error codes
 */
clfftStatus clfftGetPlanBatchSize(const clfftPlanHandle plHandle, size_t* 
        batchSize);

/*! @brief Set the number of discrete arrays that this plan can handle concurrently
 * @details Set the plan property which will be set to the number of discrete arrays (1D or 2D)
 * that will be batched together for this plan
 * @param[in] plHandle Handle to a plan previously created
 * @param[in] batchSize How many discrete number of FFT's are to be performed
 * @return Enum describing error condition; superset of OpenCL error codes
 */
clfftStatus clfftSetPlanBatchSize(clfftPlanHandle plHandle, size_t batchSize);

/*! @brief Retrieve the dimensionality of FFT's to be transformed in the plan
 * @details Queries a plan object and retrieves the dimensionality that the plan is set for. A 
 size is returned to
 * help the client allocate the proper storage to hold the dimensions in a further call to 
 clfftGetPlanLength
 * @param[in] plHandle Handle to a plan previously created
 * @param[out] dim The dimensionality of the FFT's to be transformed
 * @param[out] size Value used to allocate an array to hold the FFT dimensions.
 * @return Enum describing error condition; superset of OpenCL error codes
 */
clfftStatus clfftGetPlanDim(const clfftPlanHandle plHandle, clfftDim* dim, 
        cl_uint* size);

/*! @brief Set the dimensionality of FFT's to be transformed by the plan
 * @details Set the dimensionality of FFT's to be transformed by the plan
 * @param[in] plHandle Handle to a plan previously created
 * @param[in] dim The dimensionality of the FFT's to be transformed
 * @return Enum describing error condition; superset of OpenCL error codes
 */
clfftStatus clfftSetPlanDim(clfftPlanHandle plHandle, const clfftDim dim);

/*! @brief Retrieve the length of each dimension of the FFT
 * @details User should pass a reference to a size_t array, which will be set to the
 * length of each discrete dimension of the FFT
 * @param[in] plHandle Handle to a plan previously created
 * @param[in] dim The dimension of the length parameters; describes how many elements are in the 
 array
 * @param[out] clLengths An array of lengths, of size 'dim'. Each array value describes the 
 length of each dimension
 * @return Enum describing error condition; superset of OpenCL error codes
 */
clfftStatus clfftGetPlanLength(const clfftPlanHandle plHandle, const clfftDim dim, 
        size_t* clLengths);

/*! @brief Set the length of each dimension of the FFT
 * @details Set the plan property which will be the length of each discrete dimension of the FFT
 * @param[in] plHandle Handle to a plan previously created
 * @param[in] dim The dimension of the length parameters; describes how many elements are in the 
 array
 * @param[in] clLengths An array of lengths, of size 'dim'. Each value describes the length of 
 additional dimensions
 * @return Enum describing error condition; superset of OpenCL error codes
 */
clfftStatus clfftSetPlanLength(clfftPlanHandle plHandle, const clfftDim dim, const 
        size_t* clLengths);

/*! @brief Retrieve the distance between consecutive elements for input buffers in a dimension.
 * @details Depending on how the dimension is set in the plan (for 2D or 3D FFT's), strideY or 
 strideZ can be safely
 * ignored
 * @param[in] plHandle Handle to a plan previously created
 * @param[in] dim The dimension of the stride parameters; describes how many elements are in the 
 array
 * @param[out] clStrides An array of strides, of size 'dim'.
 */
clfftStatus clfftGetPlanInStride(const clfftPlanHandle plHandle, const clfftDim 
        dim, size_t* clStrides);

/*! @brief Set the distance between consecutive elements for input buffers in a dimension.
 * @details Set the plan properties which will be the distance between elements in a given 
 dimension
 * (units are in terms of clfftPrecision)
 * @param[in] plHandle Handle to a plan previously created
 * @param[in] dim The dimension of the stride parameters; describes how many elements are in the 
 array
 * @param[in] clStrides An array of strides, of size 'dim'. Usually strideX=1 so that successive 
 elements in the first dimension are stored contiguously.
 * Typically strideY=LenX, strideZ=LenX*LenY such that successive elements in the second and 
 third dimensions are stored in packed format.
 * See @ref DistanceStridesandPitches for details.
 */
clfftStatus clfftSetPlanInStride(clfftPlanHandle plHandle, const clfftDim dim, 
        size_t* clStrides);

/*! @brief Retrieve the distance between consecutive elements for output buffers in a 
  dimension.
 * @details Depending on how the dimension is set in the plan (for 2D or 3D FFT's), strideY or 
 strideZ can be safely
 * ignored
 * @param[in] plHandle Handle to a plan previously created
 * @param[in] dim The dimension of the stride parameters; describes how many elements are in the 
 array
 * @param[out] clStrides An array of strides, of size 'dim'.
 */
clfftStatus clfftGetPlanOutStride(const clfftPlanHandle plHandle, const clfftDim 
        dim, size_t* clStrides);

/*! @brief Set the distance between consecutive elements for output buffers in a dimension.
 * @details Set the plan properties which will be the distance between elements in a given 
 dimension
 * (units are in terms of clfftPrecision)
 * @param[in] plHandle Handle to a plan previously created
 * @param[in] dim The dimension of the stride parameters; describes how many elements are in the 
 array
 * @param[in] clStrides An array of strides, of size 'dim'. Usually strideX=1 so that successive 
 elements in the first dimension are stored contiguously.
 * Typically strideY=LenX, strideZ=LenX*LenY such that successive elements in the second and 
 third dimensions are stored in packed format.
 * @sa clfftSetPlanInStride
 */
clfftStatus clfftSetPlanOutStride(clfftPlanHandle plHandle, const clfftDim dim, 
        size_t* clStrides);

/*! @brief Retrieve the distance between Array objects
 * @details Pitch is the distance between each discrete array object in an FFT array. This is 
 only used
 * for 'array' dimensions in clfftDim; see clfftSetPlanDimension (units are in terms of 
 clfftPrecision)
 * @param[in] plHandle Handle to a plan previously created
 * @param[out] iDist The distance between the beginning elements of the discrete array objects 
 in memory on input.
 * For contiguous arrays in memory, iDist=(strideX*strideY*strideZ)
 * @param[out] oDist The distance between the beginning elements of the discrete array objects 
 in memory on output.
 * For contiguous arrays in memory, oDist=(strideX*strideY*strideZ)
 */
clfftStatus clfftGetPlanDistance(const clfftPlanHandle plHandle, size_t* iDist, 
        size_t* oDist);

/*! @brief Set the distance between Array objects
 * @details Pitch is the distance between each discrete array object in an FFT array. This is 
 only used
 * for 'array' dimensions in clfftDim; see clfftSetPlanDimension (units are in terms of 
 clfftPrecision)
 * @param[in] plHandle Handle to a plan previously created
 * @param[out] iDist The distance between the beginning elements of the discrete array objects 
 in memory on input.
 * For contiguous arrays in memory, iDist=(strideX*strideY*strideZ)
 * @param[out] oDist The distance between the beginning elements of the discrete array objects 
 in memory on output.
 * For contiguous arrays in memory, oDist=(strideX*strideY*strideZ)
 */
clfftStatus clfftSetPlanDistance(clfftPlanHandle plHandle, size_t iDist, size_t 
        oDist);

/*! @brief Retrieve the expected layout of the input and output buffers
 * @details Output buffers can be filled with either hermitian or complex numbers. Complex 
 numbers can be stored
 * in various layouts; this informs the FFT engine what layout to produce on output
 * @param[in] plHandle Handle to a plan previously created
 * @param[out] iLayout Indicates how the input buffers are laid out in memory
 * @param[out] oLayout Indicates how the output buffers are laid out in memory
 */
clfftStatus clfftGetLayout(const clfftPlanHandle plHandle, clfftLayout* iLayout, 
        clfftLayout* oLayout);

/*! @brief Set the expected layout of the input and output buffers
 * @details Output buffers can be filled with either hermitian or complex numbers. Complex 
 numbers can be stored
 * in various layouts; this informs the FFT engine what layout to produce on output
 * @param[in] plHandle Handle to a plan previously created
 * @param[in] iLayout Indicates how the input buffers are laid out in memory
 * @param[in] oLayout Indicates how the output buffers are laid out in memory
 */
clfftStatus clfftSetLayout(clfftPlanHandle plHandle, clfftLayout iLayout, 
        clfftLayout oLayout);

/*! @brief Retrieve whether the input buffers are going to be overwritten with results
 * @details If the setting is to do an in-place transform, the input buffers are overwritten 
 with the results of the
 * transform. If the setting is for out-of-place transforms, the engine knows to look for 
 separate output buffers
 * on the Enqueue call.
 * @param[in] plHandle Handle to a plan previously created
 * @param[out] placeness Tells the FFT engine to clobber the input buffers or to expect output 
 buffers for results
 */
clfftStatus clfftGetResultLocation(const clfftPlanHandle plHandle, 
        clfftResultLocation* placeness);

/*! @brief Set whether the input buffers are going to be overwritten with results
 * @details If the setting is to do an in-place transform, the input buffers are overwritten 
 with the results of the
 * transform. If the setting is for out-of-place transforms, the engine knows to look for 
 separate output buffers
 * on the Enqueue call.
 * @param[in] plHandle Handle to a plan previously created
 * @param[in] placeness Tells the FFT engine to clobber the input buffers or to expect output 
 buffers for results
 */
clfftStatus clfftSetResultLocation(clfftPlanHandle plHandle, clfftResultLocation 
        placeness);

/*! @brief Retrieve the final transpose setting of a muti-dimensional FFT
 * @details A multi-dimensional FFT typically transposes the data several times during 
 calculation. If the client
 * does not care about the final transpose to put data back in proper dimension, the final 
 transpose can be skipped
 * for possible speed improvements
 * @param[in] plHandle Handle to a plan previously created
 * @param[out] transposed Parameter specifies whether the final transpose can be skipped
 */
clfftStatus clfftGetPlanTransposeResult(const clfftPlanHandle plHandle, 
        clfftResultTransposed* transposed);

/*! @brief Set the final transpose setting of a muti-dimensional FFT
 * @details A multi-dimensional FFT typically transposes the data several times during 
 calculation. If the client
 * does not care about the final transpose to put data back in proper dimension, the final 
 transpose can be skipped
 * for possible speed improvements
 * @param[in] plHandle Handle to a plan previously created
 * @param[in] transposed Parameter specifies whether the final transpose can be skipped
 */
clfftStatus clfftSetPlanTransposeResult(clfftPlanHandle plHandle, 
        clfftResultTransposed transposed);


/*! @brief Get buffer size (in bytes), which may be needed internally for an intermediate 
  buffer
 * @details Very large FFT transforms may need multiple passes, and the operation would need a 
 temporary buffer to hold
 * intermediate results. This function is only valid after the plan is baked, otherwise an 
 invalid operation error
 * is returned. If buffersize returns as 0, the runtime needs no temporary buffer.
 * @param[in] plHandle Handle to a plan previously created
 * @param[out] buffersize Size in bytes for intermediate buffer
 */
clfftStatus clfftGetTmpBufSize(const clfftPlanHandle plHandle, size_t* buffersize);

/*! @brief Enqueue an FFT transform operation, and return immediately (non-blocking)
 * @details This transform API is the function that actually computes the FFT transfrom. It is 
 non-blocking as it
 * only enqueues the OpenCL kernels for execution. The synchronization step has to be managed by 
 the user.
 * @param[in] plHandle Handle to a plan previously created
 * @param[in] dir Forwards or backwards transform
 * @param[in] numQueuesAndEvents Number of command queues in commQueues; number of expected 
 events to be returned in outEvents
 * @param[in] commQueues An array of cl_command_queues created by the client; the command queues 
 must be a proper subset of
 * the devices included in the plan context
 * @param[in] numWaitEvents Specify the number of elements in the eventWaitList array
 * @param[in] waitEvents Events that this transform should wait to complete before executing on 
 the device
 * @param[out] outEvents The runtime fills this array with events corresponding 1 to 1 with the 
 input command queues passed
 * in commQueues. This parameter can be NULL or nullptr, in which case client is not interested 
 in receiving notifications
 * when transforms are finished, otherwise if not NULL the client is responsible for allocating 
 this array, with at least
 * as many elements as specified in numQueuesAndEvents.
 * @param[in] inputBuffers An array of cl_mem objects that contain data for processing by the 
 FFT runtime. If the transform
 * is in place, the FFT results will overwrite the input buffers
 * @param[out] outputBuffers An array of cl_mem objects that will store the results of out of 
 place transforms. If the transform
 * is in place, this parameter may be NULL or nullptr. It is completely ignored
 * @param[in] tmpBuffer A cl_mem object that is reserved as a temporary buffer for FFT 
 processing. If clTmpBuffers is NULL or nullptr,
 * and the runtime needs temporary storage, an internal temporary buffer will be created on the 
 fly managed by the runtime.
 * @return Enum describing error condition; superset of OpenCL error codes
 */
clfftStatus clfftEnqueueTransform(
        clfftPlanHandle plHandle,
        clfftDirection dir,
        cl_uint numQueuesAndEvents,
        cl_command_queue* commQueues,
        cl_uint numWaitEvents,
        const cl_event* waitEvents,
        cl_event* outEvents,
        cl_mem* inputBuffers,
        cl_mem* outputBuffers,
        cl_mem tmpBuffer
        );