/**
 *  @file     cal.h
 *  @brief    CAL Interface Header
 *  @version  1.00.0 Beta
 */


/* ============================================================

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#ifndef __CAL_H__
#define __CAL_H__

#ifdef __cplusplus
extern "C" {
#define CALAPI
#else
#define CALAPI extern
#endif

#ifdef _WIN32
#define CALAPIENTRY  __stdcall
#else
#define CALAPIENTRY
#endif

typedef void           CALvoid;       /**< void type                        */
typedef char           CALchar;       /**< ASCII character                  */
typedef signed   char  CALbyte;       /**< 1 byte signed integer value      */
typedef unsigned char  CALubyte;      /**< 1 byte unsigned integer value    */
typedef signed   short CALshort;      /**< 2 byte signed integer value      */
typedef unsigned short CALushort;     /**< 2 byte unsigned integer value    */
typedef signed   int   CALint;        /**< 4 byte signed integer value      */
typedef unsigned int   CALuint;       /**< 4 byte unsigned intger value     */
typedef float          CALfloat;      /**< 32-bit IEEE floating point value */
typedef double         CALdouble;     /**< 64-bit IEEE floating point value */
typedef signed   long  CALlong;       /**< long value                       */
typedef unsigned long  CALulong;      /**< unsigned long value              */

#if defined(_MSC_VER)

typedef signed __int64     CALint64;  /**< 8 byte signed integer value */
typedef unsigned __int64   CALuint64; /**< 8 byte unsigned integer value */

#elif defined(__GNUC__)

typedef signed long long   CALint64;  /**< 8 byte signed integer value */
typedef unsigned long long CALuint64; /**< 8 byte unsigned integer value */

#else
#error "Unsupported compiler type."
#endif



/** Boolean type */
typedef enum CALbooleanEnum {
    CAL_FALSE          = 0,           /**< Boolean false value */
    CAL_TRUE           = 1            /**< Boolean true value */
} CALboolean;

/** Function call result/return codes */
typedef enum CALresultEnum {
    CAL_RESULT_OK                = 0, /**< No error */
    CAL_RESULT_ERROR             = 1, /**< Operational error */
    CAL_RESULT_INVALID_PARAMETER = 2, /**< Parameter passed in is invalid */
    CAL_RESULT_NOT_SUPPORTED     = 3, /**< Function used properly but currently not supported */
    CAL_RESULT_ALREADY           = 4, /**< Stateful operation requested has already been performed */
    CAL_RESULT_NOT_INITIALIZED   = 5, /**< CAL function was called without CAL being initialized */
    CAL_RESULT_BAD_HANDLE        = 6, /**< A handle parameter is invalid */
    CAL_RESULT_BAD_NAME_TYPE     = 7, /**< A name parameter is invalid */
    CAL_RESULT_PENDING           = 8, /**< An asynchronous operation is still pending */
    CAL_RESULT_BUSY              = 9,  /**< The resource in question is still in use */
    CAL_RESULT_WARNING           = 10, /**< Compiler generated a warning */
} CALresult;

/** Data format representation */
typedef enum CALformatEnum {
    CAL_FORMAT_UBYTE_1,     /**< A 1 component 8-bit  unsigned byte format    */
    CAL_FORMAT_UBYTE_2,     /**< A 2 component 8-bit  unsigned byte format    */
    CAL_FORMAT_UBYTE_4,     /**< A 4 component 8-bit  unsigned byte format    */
    CAL_FORMAT_USHORT_1,    /**< A 1 component 16-bit unsigned short format   */
    CAL_FORMAT_USHORT_2,    /**< A 2 component 16-bit unsigned short format   */
    CAL_FORMAT_USHORT_4,    /**< A 4 component 16-bit unsigned short format   */
    CAL_FORMAT_UINT_4,      /**< A 4 component 32-bit unsigned integer format */
    CAL_FORMAT_BYTE_4,      /**< A 4 component 8-bit  byte format    */
    CAL_FORMAT_SHORT_1,     /**< A 1 component 16-bit short format   */
    CAL_FORMAT_SHORT_2,     /**< A 2 component 16-bit short format   */
    CAL_FORMAT_SHORT_4,     /**< A 4 component 16-bit short format   */
    CAL_FORMAT_FLOAT_1,     /**< A 1 component 32-bit float format   */
    CAL_FORMAT_FLOAT_2,     /**< A 2 component 32-bit float format   */
    CAL_FORMAT_FLOAT_4,     /**< A 4 component 32-bit float format   */
    CAL_FORMAT_DOUBLE_1,    /**< A 1 component 64-bit float format   */
    CAL_FORMAT_DOUBLE_2,    /**< A 2 component 64-bit float format   */
    CAL_FORMAT_UINT_1,      /**< A 1 component 32-bit unsigned integer format */
    CAL_FORMAT_UINT_2,      /**< A 2 component 32-bit unsigned integer format */
    CAL_FORMAT_BYTE_1,      /**< A 1 component 8-bit  byte format    */
    CAL_FORMAT_BYTE_2,      /**< A 2 component 8-bit  byte format    */
    CAL_FORMAT_INT_1,       /**< A 1 component 32-bit signed integer format */
    CAL_FORMAT_INT_2,       /**< A 2 component 32-bit signed integer format */
    CAL_FORMAT_INT_4,       /**< A 4 component 32-bit signed integer format */
} CALformat;

/** Device Kernel ISA */
typedef enum CALtargetEnum {
    CAL_TARGET_600,                /**< R600 GPU ISA */
    CAL_TARGET_610,                /**< RV610 GPU ISA */
    CAL_TARGET_630,                /**< RV630 GPU ISA */
    CAL_TARGET_670,                /**< RV670 GPU ISA */
    CAL_TARGET_7XX,                /**< R700 class GPU ISA */
    CAL_TARGET_770,                /**< RV770 GPU ISA */
    CAL_TARGET_710,                /**< RV710 GPU ISA */
    CAL_TARGET_730,                /**< RV730 GPU ISA */
} CALtarget;

/** CAL object container */
typedef struct CALobjectRec* CALobject;

/** CAL image container */
typedef struct CALimageRec*  CALimage;

typedef CALuint CALdevice;      /**< Device handle */
typedef CALuint CALcontext;     /**< context */
typedef CALuint CALresource;    /**< resource handle */
typedef CALuint CALmem;         /**< memory handle */
typedef CALuint CALfunc;        /**< function handle */
typedef CALuint CALname;        /**< name handle */
typedef CALuint CALmodule;      /**< module handle */
typedef CALuint CALevent;       /**< event handle */

/** CAL computational domain */
typedef struct CALdomainRec {
    CALuint x;                 /**< x origin of domain */
    CALuint y;                 /**< y origin of domain */
    CALuint width;             /**< width of domain */
    CALuint height;            /**< height of domain */
} CALdomain;

/** CAL device information */
typedef struct CALdeviceinfoRec {
    CALtarget  target;              /**< Device Kernel ISA  */
    CALuint    maxResource1DWidth;  /**< Maximum resource 1D width */
    CALuint    maxResource2DWidth;  /**< Maximum resource 2D width */
    CALuint    maxResource2DHeight; /**< Maximum resource 2D height */
} CALdeviceinfo;

/** CAL device attributes */
typedef struct CALdeviceattribsRec {
    CALuint    struct_size;         /**< Client filled out size of CALdeviceattribs struct */
    CALtarget  target;              /**< Asic identifier */
    CALuint    localRAM;            /**< Amount of local GPU RAM in megabytes */
    CALuint    uncachedRemoteRAM;   /**< Amount of uncached remote GPU memory in megabytes */
    CALuint    cachedRemoteRAM;     /**< Amount of cached remote GPU memory in megabytes */
    CALuint    engineClock;         /**< GPU device clock rate in megahertz */
    CALuint    memoryClock;         /**< GPU memory clock rate in megahertz */
    CALuint    wavefrontSize;       /**< Wavefront size */
    CALuint    numberOfSIMD;        /**< Number of SIMDs */
    CALboolean doublePrecision;     /**< double precision supported */
    CALboolean localDataShare;      /**< local data share supported */
    CALboolean globalDataShare;     /**< global data share supported */
    CALboolean globalGPR;           /**< global GPR supported */
    CALboolean computeShader;       /**< compute shader supported */
    CALboolean memExport;           /**< memexport supported */
    CALuint    pitch_alignment;     /**< Required alignment for calCreateRes allocations (in data elements) */
    CALuint    surface_alignment;   /**< Required start address alignment for calCreateRes allocations (in bytes) */
} CALdeviceattribs;

/** CAL device status */
typedef struct CALdevicestatusRec {
    CALuint   struct_size;            /**< Client filled out size of CALdevicestatus struct */
    CALuint   availLocalRAM;          /**< Amount of available local GPU RAM in megabytes */
    CALuint   availUncachedRemoteRAM; /**< Amount of available uncached remote GPU memory in megabytes */
    CALuint   availCachedRemoteRAM;   /**< Amount of available cached remote GPU memory in megabytes */
} CALdevicestatus;

/** CAL resource allocation flags **/
typedef enum CALresallocflagsEnum {
    CAL_RESALLOC_GLOBAL_BUFFER  = 1, /**< used for global import/export buffer */
    CAL_RESALLOC_CACHEABLE      = 2, /**< cacheable memory? */
} CALresallocflags;

/** CAL computational 3D domain */
typedef struct CALdomain3DRec {
    CALuint width;             /**< width of domain */
    CALuint height;            /**< height of domain */
    CALuint depth;             /**< depth  of domain */
} CALdomain3D;

/** CAL computational grid */
typedef struct CALprogramGridRec {
    CALfunc     func;          /**< CALfunc to execute */
    CALdomain3D gridBlock;     /**< size of a block of data */
    CALdomain3D gridSize;      /**< size of 'blocks' to execute. */
    CALuint     flags;         /**< misc grid flags */
} CALprogramGrid;

/** CAL computational grid array*/
typedef struct CALprogramGridArrayRec {
    CALprogramGrid* gridArray;/**< array of programGrid structures */
    CALuint     num;           /**< number of entries in the grid array */
    CALuint     flags;         /**< misc grid array flags */
} CALprogramGridArray;

/** CAL function information **/
typedef struct CALfuncInfoRec
{
    CALuint    maxScratchRegsNeeded;    /**< Maximum number of scratch regs needed */
    CALuint    numSharedGPRUser;        /**< Number of shared GPRs */
    CALuint    numSharedGPRTotal;       /**< Number of shared GPRs including ones used by SC */
    CALboolean eCsSetupMode;            /**< Slow mode */
    CALuint    numThreadPerGroup;       /**< Number of threads per group */
    CALuint    totalNumThreadGroup;     /**< Total number of thread groups */
    CALuint    wavefrontPerSIMD;        /**< Number of wavefronts per SIMD */ //CAL_USE_SC_PRM
    CALuint    numWavefrontPerSIMD;     /**< Number of wavefronts per SIMD */
    CALboolean isMaxNumWavePerSIMD;     /**< Is this the max num active wavefronts per SIMD */
    CALboolean setBufferForNumGroup;    /**< Need to set up buffer for info on number of thread groups? */
} CALfuncInfo;

/*============================================================================
 * CAL Runtime Interface
 *============================================================================*/

/*----------------------------------------------------------------------------
 * CAL Subsystem Functions
 *----------------------------------------------------------------------------*/

/**
 * @fn calInit(void)
 *
 * @brief Initialize the CAL subsystem.
 *
 * Initializes the CAL system for computation. The behavior of CAL methods is
 * undefined if the system is not initialized.
 *
 * @return Returns CAL_RESULT_OK on success, CAL_RESULT_ERROR if there was an error, and CAL_RESULT_ALREADY
 * of CAL has already been initialized.
 *
 * @sa calShutdown
 */
CALAPI CALresult CALAPIENTRY calInit(void);


/**
 * @fn calGetVersion(CALuint* major, CALuint* minor, CALuint* imp)
 *
 * @brief Retrieve the CAL version that is loaded
 *
 * CAL version is in the form of API_Major.API_Minor.Implementation where
 * "API_Major" is the major version number of the CAL API. "API_Minor" is the
 * minor version number of the CAL API. "Implementation" is the implementation
 * instance of the supplied API version number.
 *
 * @return Returns CAL_RESULT_OK on success.
 *
 * @sa calInit calShutdown
 */
CALAPI CALresult CALAPIENTRY calGetVersion(CALuint* major, CALuint* minor, CALuint* imp);

/**
 * @fn calShutdown(void)
 *
 * @brief Shuts down the CAL subsystem.
 *
 * Shuts down the CAL system. calShutdown should always be paired with
 * calInit. An application may have any number of calInit - calShutdown
 * pairs. Any CAL call outsied calInit - calShutdown pair will return
 * CAL_RESULT_NOT_INITIALIZED.
 *
 * @return Returns CAL_RESULT_OK on success, CAL_RESULT_ERROR if there was an error.
 *
 * @sa calInit
 */
CALAPI CALresult CALAPIENTRY calShutdown(void);


/*----------------------------------------------------------------------------
 * CAL Device Functions
 *----------------------------------------------------------------------------*/

/**
 * @fn calDeviceGetCount(CALuint* count)
 *
 * @brief Retrieve the number of devices available to the CAL subsystem.
 *
 * Returns in *count the total number of supported GPUs present in the system.
 *
 * @param count (out) - the number of devices available to CAL. On error, count will be zero.
 *
 * @return Returns CAL_RESULT_OK on success, CAL_RESULT_ERROR if there was an error.
 *
 * @sa calDeviceGetInfo calDeviceOpen calDeviceClose
 */
CALAPI CALresult CALAPIENTRY calDeviceGetCount(CALuint* count);

/**
 * @fn calDeviceGetInfo(CALdeviceinfo* info, CALuint ordinal)
 *
 * @brief Retrieve information about a specific device available to the CAL subsystem.
 *
 * Returns the device specific information in *info. calDeviceGetInfo returns
 * CAL_RESULT_ERROR if the ordinal is not less than the *count returned in
 * calDeviceGetCount. The target instruction set, the maximum width of
 * 1D resources, the maximum width and height of 2D resources are part
 * of the CALdeviceinfo structure.
 *
 * @param info (out) - the device descriptor struct for the specified device.
 * @param ordinal (in) - zero based index of the device to retrieve information.
 *
 * @return Returns CAL_RESULT_OK on success, CAL_RESULT_ERROR if there was an error.
 *
 * @sa calDeviceGetCount calDeviceOpen calDeviceClose
 */
CALAPI CALresult CALAPIENTRY calDeviceGetInfo(CALdeviceinfo* info, CALuint ordinal);

/**
 * @fn calDeviceGetAttribs(CALdeviceattribs* attribs, CALuint ordinal)
 *
 * @brief Retrieve information about a specific device available to the CAL subsystem.
 *
 * Returns the device specific attributes in *attribs. calDeviceGetAttribs returns
 * CAL_RESULT_ERROR if the ordinal is not less than the *count returned in
 * calDeviceGetCount.
 *
 * @param attribs (out) - the device attribute struct for the specified device.
 * @param ordinal (in) - zero based index of the device to retrieve information.
 *
 * @return Returns CAL_RESULT_OK on success, CAL_RESULT_ERROR if there was an error.
 *
 * @sa calDeviceGetCount calDeviceOpen calDeviceClose
 */
CALAPI CALresult CALAPIENTRY calDeviceGetAttribs(CALdeviceattribs* attribs, CALuint ordinal);


/**
 * @fn calDeviceGetStatus(CALdevicestatus* status, CALdevice device)
 *
 * @brief Retrieve information about a specific device available to the CAL subsystem.
 *
 * Returns the current status of an open device in *status.
 *
 * @param status (out) - the status struct for the specified device.
 * @param device (in) - handle of the device from which status is to be retrieved.
 *
 * @return Returns CAL_RESULT_OK on success, CAL_RESULT_ERROR if there was an error.
 *
 * @sa calDeviceGetAttribs calDeviceOpen calDeviceClose
 */
CALAPI CALresult CALAPIENTRY calDeviceGetStatus(CALdevicestatus* status, CALdevice device);

/**
 * @fn calDeviceOpen(CALdevice* dev, CALuint ordinal)
 *
 * @brief Open the specified device.
 *
 * Opens a device. A device has to be closed before it can be opened again in
 * the same application. This call should always be paired with calDeviceClose.
 * Open the device indexed by the <i>ordinal</i> parameter, which
 * is an unsigned integer in the range of zero to the number of available devices (minus one).
 *
 * @param dev (out) - the device handle for the specified device. On error, dev will be zero.
 * @param ordinal (in) - zero based index of the device to retrieve information.
 *
 * @return Returns CAL_RESULT_OK on success, CAL_RESULT_ERROR if there was an error.
 *
 * @sa calDeviceGetCount calDeviceGetInfo calDeviceClose
 */
CALAPI CALresult CALAPIENTRY calDeviceOpen(CALdevice* dev, CALuint ordinal);

/**
 * @fn calDeviceClose(CALdevice dev)
 *
 * @brief Close the specified device.
 *
 * Close the device specified by <i>dev</i> parameter. The
 *
 * @param dev (in) - the device handle for the device to close
 *
 * @return Returns CAL_RESULT_OK on success, CAL_RESULT_ERROR if there was an error.
 *
 * @sa calDeviceGetCount calDeviceGetInfo calDeviceOpen
 */
CALAPI CALresult CALAPIENTRY calDeviceClose(CALdevice dev);


/*----------------------------------------------------------------------------
 * CAL Resource Functions
 *----------------------------------------------------------------------------*/

/**
 * @fn calResAllocLocal2D(CALresource* res, CALdevice dev, CALuint width, CALuint height, CALformat format, CALuint flags)
 *
 * @brief Allocate a memory resource local to a device
 *
 * allocates memory resource local to a device <i>dev</i> and returns a
 * resource handle in <i>*res</i> if successful. This memory is structured
 * as a 2 dimensional region of <i>width</i> and <i>height</i> with a <i>format</i>.
 * The maximum values of <i>width</i> and <i>height</i> are available through
 * the calDeviceGetInfo function. The call returns CAL_RESULT_ERROR if requested
 * memory was not available.
 *
 * Initial implementation will allow this memory to be accessible by all contexts
 * created on this device only. Contexts residing on other devices cannot access
 * this memory.
 *
 * <i>flags</i> can be zero or CAL_RESALLOC_GLOBAL_BUFFER
 * - to specify that the resource will be used as a global
 *   buffer.
 *
 * There are some performance implications when <i>width</i> is not a multiple
 * of 64 for R6xx GPUs.
 *
 * @param res (out)   - returned resource handle. On error, res will be zero.
 * @param dev (in)    - device the resource should be local.
 * @param width (in)  - width of resource (in elements).
 * @param height (in) - height of the resource (in elements).
 * @param format (in) - format/type of each element of the resource.
 * @param flags (in) - currently unused.
 *
 * @return Returns CAL_RESULT_OK on success, CAL_RESULT_ERROR if there was an error.
 *
 * @sa calResFree
 */
CALAPI CALresult CALAPIENTRY calResAllocLocal2D(CALresource* res, CALdevice dev, CALuint width, CALuint height, CALformat format, CALuint flags);

/**
 * @fn calResAllocRemote2D(CALresource* res, CALdevice* dev, CALuint devCount, CALuint width, CALuint height, CALformat format, CALuint flags)
 *
 * @brief Allocate a memory resource remote to a set of devices
 *
 * allocates memory resource global to <i>devCount</i> number of devices in <i>dev</i> array
 * and returns a resource handle in <i>*res</i> if successful. This memory is structured
 * as a 2 dimensional region of <i>width</i> and <i>height</i> with a <i>format</i>.
 * The maximum values of <i>width</i> and <i>height</i> are available through
 * the calDeviceGetInfo function. The call returns CAL_RESULT_ERROR if requested
 * memory was not available.
 *
 * Currently only a single device is functional (<i>devCount</i> must be 1).
 *
 * Initial implementation will allow this memory to be accessible by all contexts
 * created on this device only. Contexts residing on other devices cannot access
 * this memory.
 *
 * <i>flags</i> can be zero or CAL_RESALLOC_GLOBAL_BUFFER - to
 * specify that the resource will be used as a global buffer or
 * CAL_RESALLOC_CACHEABLE for GART cacheable memory.
 *
 * One of the benefits with devices being able to write to remote (i.e. system)
 * memory is performance. For example, with large computational kernels, it is
 * sometimes faster for the GPU contexts to write directly to remote
 * memory than it is to do these in 2 steps of GPU context writing to local memory
 * and copying data from GPU local memory to remote system memory via calMemCopy
 *
 * @param res (out)   - returned resource handle. On error, res will be zero.
 * @param dev (in)    - list of devices the resource should be available to.
 * @param devCount (in) - number of devices in the device list.
 * @param width (in)  - width of resource (in elements).
 * @param height (in) - height of the resource (in elements).
 * @param format (in) - format/type of each element of the resource.
 * @param flags (in) - currently unused.
 *
 * @return Returns CAL_RESULT_OK on success, CAL_RESULT_ERROR if there was an error.
 *
 * @sa calResFree
 */
CALAPI CALresult CALAPIENTRY calResAllocRemote2D(CALresource* res, CALdevice *dev, CALuint deviceCount, CALuint width, CALuint height, CALformat format, CALuint flags);

/**
 * @fn calResAllocLocal1D(CALresource* res, CALdevice dev, CALuint width, CALformat format, CALuint flags)
 *
 * @brief Allocate a 1D memory resource local to a device
 *
 * allocates memory resource local to a device <i>device</i> and returns
 * a resource handle in <i>*res</i> if successful. This memory is
 * structured as a 1 dimensional array of <i>width</i> elements with a <i>format</i>}.
 * The maximum values of <i>width</i> is available from the calDeviceGetInfo function.
 * The call returns CAL_RESULT_ERROR if requested memory was not available.
 *
 * @param res (out)   - returned resource handle. On error, res will be zero.
 * @param dev (in)    - device the resource should be local.
 * @param width (in)  - width of resource (in elements).
 * @param format (in) - format/type of each element of the resource.
 * @param flags (in) - currently unused.
 *
 * @return Returns CAL_RESULT_OK on success, CAL_RESULT_ERROR if there was an error.
 *
 * @sa calResFree
 */
CALAPI CALresult CALAPIENTRY calResAllocLocal1D(CALresource* res, CALdevice dev, CALuint width, CALformat format, CALuint flags);

/**
 * @fn calResAllocRemote1D(CALresource* res, CALdevice* dev, CALuint deviceCount, CALuint width, CALformat format, CALuint flags)
 *
 * @brief Allocate a 1D memory resource remote to a device
 *
 * allocates memory resource global to <i>devCount</i> number of devices
 * in <i>dev</i> array and returns a resource memory handle in <i>*res</i> if
 * successful. This memory resource is structured as a 1 dimensional
 * region of <i>width</i> elements with a <i>format</i>. The maximum values of
 * <i>width</i> is available from the calDeviceGetInfo function. The call returns
 * CAL_RESULT_ERROR if requested memory was not available.
 *
 * Currently only a single device is functional (<i>devCount</i> must be 1).
 *
 * @param res (out)   - returned resource handle. On error, res will be zero.
 * @param dev (in)    - device the resource should be local.
 * @param deviceCount (in) - number of devices in the device list.
 * @param width (in)  - width of resource (in elements).
 * @param format (in) - format/type of each element of the resource.
 * @param flags (in) - currently unused.
 *
 * @return Returns CAL_RESULT_OK on success, CAL_RESULT_ERROR if there was an error.
 *
 * @sa calResFree
 */
CALAPI CALresult CALAPIENTRY calResAllocRemote1D(CALresource* res, CALdevice* dev, CALuint deviceCount, CALuint width, CALformat format, CALuint flags);

/**
 * @fn calResFree(CALresource res)
 *
 * @brief Free a resource
 *
 * releases allocated memory resource. calResFree returns CAL_RESULT_BUSY if
 * the resources is in use by any context.
 *
 * @param res (in)   - resource handle to free.
 *
 * @return Returns CAL_RESULT_OK on success, CAL_RESULT_ERROR if there was an error.
 *
 * @sa calResAllocLocal2D calResAllocRemote2D calResAllocLocal1D calResAllocRemote1D
 */
CALAPI CALresult CALAPIENTRY calResFree(CALresource res);

/**
 * @fn calResMap(CALvoid** pPtr, CALuint* pitch, CALresource res, CALuint flags)
 *
 * @brief Map memory to the CPU
 *
 *
 * returns a CPU accessible pointer to the memory surface in <i>**pPtr</i>
 * and the pitch in <i>*pitch</i>.  All memory resources are CPU accessible. It is an
 * error to call <i>calResMap</i> within a <i>calResMap</i> - <i>calResUnmap</i> pair
 * for the same <i>CALresource</i> memory resource handle.
 *
 * A mapped surface cannot be used as input or output of a calCtxRunProgram or calMemCopy.
 *
 * @param pPtr (out) - CPU pointer to the mapped resource. On error, pPtr will be zero.
 * @param pitch (out) - Pitch in elements of the resource. On error, pitch will be zero.
 * @param res (in) - resource handle to map
 * @param flags (in) - not used
 *
 * @return Returns CAL_RESULT_OK on success, CAL_RESULT_ERROR if there was an error.
 *
 * @sa calResUnmap
 */
CALAPI CALresult CALAPIENTRY calResMap(CALvoid** pPtr, CALuint* pitch, CALresource res, CALuint flags);

/**
 * @fn calResUnmap(CALresource res)
 *
 * @brief Unmap a CPU mapped resource.
 *
 * releases the address returned in <i>calResMap</i>. This should always be
 * paired with <i>calResMap</i>
 *
 * @param res (in) - resource handle to unmap
 *
 * @return Returns CAL_RESULT_OK on success, CAL_RESULT_ERROR if there was an error.
 *
 * @sa calResMap
 */
CALAPI CALresult CALAPIENTRY calResUnmap(CALresource res);


/*----------------------------------------------------------------------------
 * CAL Context Functions
 *----------------------------------------------------------------------------*/

/**
 * @fn calCtxCreate(CALcontext* ctx, CALdevice dev)
 *
 * @brief Create a CAL context on the specified device
 *
 * creates a context on a device. Multiple contexts can be created on
 * a single device.
 *
 * @param ctx (out) - handle of the newly created context. On error, ctx will be zero.
 * @param dev (in) - device handle to create the context on
 *
 * @return Returns CAL_RESULT_OK on success, CAL_RESULT_ERROR if there was an error.
 *
 * @sa calCtxDestroy
 */
CALAPI CALresult CALAPIENTRY calCtxCreate(CALcontext* ctx, CALdevice dev);

/**
 * @fn calCtxDestroy(CALcontext ctx)
 *
 * @brief Destroy a CAL context
 *
 * destroys a context. All current modules are unloaded and all CALmem objects
 * mapped to the context are released. This call should be paired with
 * <i>calCtxCreate</i>
 *
 * @param ctx (in) - context to destroy
 *
 * @return Returns CAL_RESULT_OK on success, CAL_RESULT_ERROR if there was an error.
 *
 * @sa calCtxCreate
 */
CALAPI CALresult CALAPIENTRY calCtxDestroy(CALcontext ctx);

/**
 * @fn calCtxGetMem(CALmem* mem, CALcontext ctx, CALresource res)
 *
 * @brief Map a resource to a context
 *
 * returns a memory handle in <i>*mem</i> for the resource surface <i>res</i>
 * for use by the context <i>ctx</i>.
 *
 * @param mem (out) - created memory handle. On error, mem will be zero.
 * @param ctx (in) - context in which resouce is mapped
 * @param res (in) - resource to map to context
 *
 * @return Returns CAL_RESULT_OK on success, CAL_RESULT_ERROR if there was an error.
 *
 * @sa calCtxReleaseMem calCtxSetMem
 */
CALAPI CALresult CALAPIENTRY calCtxGetMem(CALmem* mem, CALcontext ctx, CALresource res);

/**
 * @fn calCtxReleaseMem(CALcontext ctx, CALmem mem)
 *
 * @brief Release a resource to context mapping
 *
 * releases memory handle <i>mem</i> that is obtained by <i>calCtxGetMem</i>.
 *
 * @param ctx (in) - context in which resouce is mapped
 * @param mem (in) - memory handle to release
 *
 * @return Returns CAL_RESULT_OK on success, CAL_RESULT_ERROR if there was an error.
 *
 * @sa calCtxGetMem calCtxSetMem
 */
CALAPI CALresult CALAPIENTRY calCtxReleaseMem(CALcontext ctx, CALmem mem);

/**
 * @fn calCtxSetMem(CALcontext ctx, CALname name, CALmem mem)
 *
 * @brief Set memory used for kernel input or output
 *
 * sets a memory handle <i>mem</i> with the associated <i>name</i> in
 * the module to the context <i>ctx</i>. This can be input or output.
 *
 * @param ctx (in) - context to apply attachment.
 * @param name (in) - name to bind memory.
 * @param mem (in) - memory handle to apply.
 *
 * @return Returns CAL_RESULT_OK on success, CAL_RESULT_ERROR if there was an error.
 *
 * @sa calCtxGetMem calCtxReleaseMem
 */
CALAPI CALresult CALAPIENTRY calCtxSetMem(CALcontext ctx, CALname name, CALmem mem);

/**
 * @fn calCtxRunProgram(CALevent* event, CALcontext ctx, CALfunc func, const CALdomain* domain)
 *
 * @brief Invoke the kernel over the specified domain.
 *
 *
 * issues a task to invoke the computation of the kernel identified by
 * <i>func</i> within a region <i>domain</i> on the context <i>ctx</i> and
 * returns an associated event token in <i>*event</i> with this task. This
 * method returns CAL_RESULT_ERROR if <i>func</i> is not found in the currently
 * loaded module. This method returns CAL_RESULT_ERROR, if any of the inputs,
 * input references, outputs and constant buffers associated with the kernel
 * are not setup. Completion of this event can be queried by the master process
 * using <i>calIsEventDone</i>
 *
 * Extended contextual information regarding a calCtxRunProgram failure
 * can be obtained with the calGetErrorString function.
 *
 * @param event (out) - event associated with RunProgram instance. On error, event will be zero.
 * @param ctx (in) - context.
 * @param func (in) - function to use as kernel.
 * @param domain (in) - domain over which kernel is applied.
 *
 * @return Returns CAL_RESULT_OK on success, CAL_RESULT_ERROR if there was an error.
 *
 * @sa calCtxIsEventDone
 */
CALAPI CALresult CALAPIENTRY calCtxRunProgram(CALevent* event, CALcontext ctx, CALfunc func, const CALdomain* domain);

/**
 * @fn calCtxIsEventDone(CALcontext ctx, CALevent event)
 *
 * @brief Query to see if event has completed
 *
 *
 * is a mechanism for the master process to query if an event <i>event</i> on
 * context <i>ctx</i> from <i>calCtxRunProgram</i> or <i>calMemCopy</i> is
 * completed. This call also ensures that the commands associated with
 * the context are flushed.
 *
 * @param ctx (in) - context to query.
 * @param event (in) - event to query.
 *
 * @return Returns CAL_RESULT_OK if the event is complete, CAL_RESULT_PENDING if the event is
 * still being processed and CAL_RESULT_ERROR if there was an error.
 *
 * @sa calCtxRunProgram
 */
CALAPI CALresult CALAPIENTRY calCtxIsEventDone(CALcontext ctx, CALevent event);

/**
 * @fn calCtxFlush(CALcontext ctx)
 *
 * @brief Flush any commands associated with the supplied context
 *
 * This call ensures that the commands associated with the
 * context are flushed.
 *
 * @param ctx (in) - context to flush.
 *
 * @return Returns CAL_RESULT_OK if the event is complete, CAL_RESULT_ERROR if
 * there was an error.
 *
 * @sa calCtxRunProgram calCtxIsEventDone
 */
CALAPI CALresult CALAPIENTRY calCtxFlush(CALcontext ctx);

/**
 * @fn calMemCopy(CALevent* event, CALcontext ctx, CALmem srcMem, CALmem dstMem, CALuint flags)
 *
 * @brief Copy srcMem to dstMem
 *
 * issues a task to copy data from a source memory handle to a
 * destination memory handle. This method returns CAL_RESULT_ERROR if the source
 * and destination memory have different memory formats or if the destination
 * memory handle is not as big in 2 dimensions as the source memory or
 * if the source and destination memory handles do not belong to the
 * context <i>ctx</i>. An event is associated with this task and is returned in
 * <i>*event</i> and completion of this event can be queried by the master
 * process using <i>calIsEventDone</i>. Data can be copied between memory
 * handles from remote system memory to device local memory, remote system
 * memory to remote system memory, device local memory to remote
 * system memory, device local memory to same device local memory, device
 * local memory to a different device local memory. The memory is copied by
 * the context <i>ctx</i>
 *
 * @param event (out) - event associated with Memcopy instance. On error, event will be zero.
 * @param ctx (in) - context to query.
 * @param srcMem (in) - source of the copy.
 * @param dstMem (in) - destination of the copy.
 * @param flags (in) - currently not used.
 *
 * @return Returns CAL_RESULT_OK on success, CAL_RESULT_ERROR if there was an error.
 *
 * @sa calCtxRunProgram
 */
CALAPI CALresult CALAPIENTRY calMemCopy(CALevent* event, CALcontext ctx, CALmem srcMem, CALmem dstMem, CALuint flags);

/*----------------------------------------------------------------------------
 * CAL Image Functions
 *----------------------------------------------------------------------------*/

/**
 * @fn calImageRead(CALimage* image, const CALvoid* buffer, CALuint size)
 *
 * @brief Create a CALimage and serialize into it from the supplied buffer.
 *
 * Create a CALimage and populate it with information from the supplied buffer.
 *
 * @param image (out) - image created from serialization
 * @param buffer (in) - buffer to serialize from
 * @param size (in) - size of buffer
 *
 * @return Returns CAL_RESULT_OK on success, CAL_RESULT_ERROR if there was an error.
 * @sa calImageFree
 */
CALAPI CALresult CALAPIENTRY calImageRead(CALimage *image, const CALvoid* buffer, CALuint size);

/**
 * @fn calImageFree(CALimage image)
 *
 * @brief Free the supplied CALimage.
 *
 * Free a calImage that was created with calImageRead.
 *
 * @param image (in) - image to free
 *
 * @return Returns CAL_RESULT_OK on success, CAL_RESULT_ERROR if there was an error.
 *
 * @sa calImageRead
 */
CALAPI CALresult CALAPIENTRY calImageFree(CALimage image);

/*----------------------------------------------------------------------------
 * CAL Module Functions
 *----------------------------------------------------------------------------*/

/**
 * @fn calModuleLoad(CALmodule* module, CALcontext ctx, CALimage image)
 *
 * @brief Load a kernel image to a context
 *
 * creates a module from precompiled image <i>image</i>, loads the module
 * on the context and returns the loaded module in <i>*module</i>. This
 * method returns CAL_RESULT_ERROR if the module cannot be loaded onto the
 * processor. One of the reasons why a module cannot be loaded is if the
 * module does not have generated ISA for the hardware that it is loaded
 * onto. Multiple images can be loaded onto a single context at any single time.
 *
 * @param module (out) - handle to the loaded image. On error, module will be zero.
 * @param ctx (in) - context to load an image.
 * @param image (in) - raw image to load.
 *
 * @return Returns CAL_RESULT_OK on success, CAL_RESULT_ERROR if there was an error.
 *
 * @sa calModuleUnload calModuleGetEntry calModuleGetName
 */
CALAPI CALresult CALAPIENTRY calModuleLoad(CALmodule* module, CALcontext ctx, CALimage image);

/**
 * @fn calModuleUnload(CALcontext ctx, CALmodule module)
 *
 * @brief Unload a kernel image
 *
 * unloads the module from the context.
 *
 * @param ctx (in) - context.
 * @param module (in) - handle to the loaded image.
 *
 * @return Returns CAL_RESULT_OK on success, CAL_RESULT_ERROR if there was an error.
 *
 * @sa calModuleLoad calModuleGetEntry calModuleGetName
 */
CALAPI CALresult CALAPIENTRY calModuleUnload(CALcontext ctx, CALmodule module);

/**
 * @fn calModuleGetEntry(CALfunc* func, CALcontext ctx, CALmodule module, const CALchar* procName)
 *
 * @brief Retrieve a kernel function
 *
 * returns in <i>*func</i> the entry point to the kernel function named
 * <i>procName</i> from the module <i>module</i>. This method returns
 * CAL_RESULT_ERROR if the entry point <i>procName</i> is not found in the module.
 *
 * @param func (out) - handle to kernel function. On error, func will be zero.
 * @param ctx (in) - context.
 * @param module (in) - handle to the loaded image.
 * @param procName (in) - name of the function.
 *
 * @return Returns CAL_RESULT_OK on success, CAL_RESULT_ERROR if there was an error.
 *
 * @sa calModuleLoad calModuleUnload calModuleGetEntry
 */
CALAPI CALresult CALAPIENTRY calModuleGetEntry(CALfunc* func, CALcontext ctx, CALmodule module, const CALchar* procName);

/**
 * @fn calModuleGetName(CALname* name, CALcontext ctx, CALmodule module, const CALchar* varName)
 *
 * @brief Retrieve a kernel parameter by name
 *
 * returns in <i>*name</i> the handle to the module global variable named
 * <i>varName</i> that can be used to setup inputs and constant buffers to
 * the kernel computation. This method returns CAL_RESULT_ERROR if the variable
 * <i>varName</i> is not found in the module.
 *
 * @param name (out) - handle to name symbol. On error, name will be zero.
 * @param ctx (in) - context.
 * @param module (in) - handle to the loaded image.
 * @param varName (in) - name of the input or output.
 *
 * @return Returns CAL_RESULT_OK on success, CAL_RESULT_ERROR if there was an error.
 *
 * @sa calModuleLoad calModuleUnload calModuleGetEntry
 */
CALAPI CALresult CALAPIENTRY calModuleGetName(CALname* name, CALcontext ctx, CALmodule module, const CALchar* varName);

/*----------------------------------------------------------------------------
 * CAL Error/Debug Helper Functions
 *----------------------------------------------------------------------------*/
/**
 * @fn calGetErrorString(void)
 *
 * @brief Return details about current error state
 *
 * calGetErrorString returns a text string containing details about the last
 * returned error condition. Calling calGetErrorString does not effect the
 * error state.
 *
 * @return Returns a null terminated string detailing the error condition
 *
 * @sa calInit calShutdown
 */
CALAPI const CALchar* CALAPIENTRY calGetErrorString(void);

/**
 * @fn calCtxRunProgramGrid(CALevent* event, CALcontext ctx, CALprogramGrid* pProgramGrid)
 *
 * @brief Invoke the kernel over the specified domain.
 *
 *
 * issues a task to invoke the computation of the kernel identified by
 * <i>func</i> within a region <i>domain</i> on the context <i>ctx</i> and
 * returns an associated event token in <i>*event</i> with this task. This
 * method returns CAL_RESULT_ERROR if <i>func</i> is not found in the currently
 * loaded module. This method returns CAL_RESULT_ERROR, if any of the inputs,
 * input references, outputs and constant buffers associated with the kernel
 * are not setup. Completion of this event can be queried by the master process
 * using <i>calIsEventDone</i>
 *
 * Extended contextual information regarding a calCtxRunProgram failure
 * can be obtained with the calGetErrorString function.
 *
 * @param event (out) - event associated with RunProgram instance. On error, event will be zero.
 * @param ctx (in) - context.
 * @param pProgramGrid (in) - description of program information to get kernel and thread counts.
 *
 * @return Returns CAL_RESULT_OK on success, CAL_RESULT_ERROR if there was an error.
 *
 * @sa calCtxIsEventDone
 */
CALAPI CALresult CALAPIENTRY calCtxRunProgramGrid(CALevent* event,
                                                  CALcontext ctx,
                                                  CALprogramGrid* pProgramGrid);

/**
 * @fn calModuleGetFuncInfo(CALfuncInfo* pInfo, CALcontext ctx, CALmodule module, CALfunc func)
 *
 * @brief Retrieve information regarding the named func in the
 * named module.
 *
 * returns in <i>*info</i> the information regarding the func.
 * This method returns CAL_RESULT_NOT_INITIALIZED if CAL is not
 * initialied.
 * This method returns CAL_RESULT_INVALID_PARAMETER if info is
 * NULL.
 * This method returns CAL_RESULT_BAD_HANDLE if ctx is invalid
 * or module is not loaded or func is not found.
 * This method returns CAL_RESULT_ERROR if there was an error
 *
 * @param pInfo (out) - pointer to CALmoduleInfo output
 *              structure.
 * @param ctx (in) - context.
 * @param module (in) - handle to the loaded image.
 * @param func (in) - name of the function.
 *
 * @return Returns CAL_RESULT_OK on success,
 *         CAL_RESULT_NOT_INITIALIZED,
 *         CAL_RESULT_INVALID_PARAMETER, CAL_RESULT_BAD_HANDLE,
 *         or CAL_RESULT_ERROR if there was an error.
 *
 */
CALAPI CALresult CALAPIENTRY calModuleGetFuncInfo(CALfuncInfo* pInfo,
                     CALcontext   ctx,
                     CALmodule    module,
                     CALfunc      func);

/**
 * @fn calCtxRunProgramGridArray(CALevent* event, CALcontext ctx, CALprogramGridArray* pGridArray)
 *
 * @brief Invoke the kernel array over the specified domain(s).
 *
 *
 * issues a task to invoke the computation of the kernel arrays identified by
 * <i>func</i> within a region <i>domain</i> on the context <i>ctx</i> and
 * returns an associated event token in <i>*event</i> with this task. This
 * method returns CAL_RESULT_ERROR if <i>func</i> is not found in the currently
 * loaded module. This method returns CAL_RESULT_ERROR, if any of the inputs,
 * input references, outputs and constant buffers associated with the kernel
 * are not setup. Completion of this event can be queried by the master process
 * using <i>calIsEventDone</i>
 *
 * Extended contextual information regarding a calCtxRunProgram failure
 * can be obtained with the calGetErrorString function.
 *
 * @param event (out) - event associated with RunProgram instance. On error, event will be zero.
 * @param ctx (in) - context.
 * @param pGridArray (in) - array containing kernel programs and grid information.
 *
 * @return Returns CAL_RESULT_OK on success, CAL_RESULT_ERROR if there was an error.
 *
 * @sa calCtxIsEventDone
 */
CALAPI CALresult CALAPIENTRY calCtxRunProgramGridArray(CALevent* event,
                                                  CALcontext ctx,
                                                  CALprogramGridArray* pGridArray);
#ifdef __cplusplus
}      /* extern "C" { */
#endif


#endif /* __CAL_H__ */



