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#ifndef NVBLASTEXTASSETUTILS_H
#define NVBLASTEXTASSETUTILS_H


#include "NvBlastTypes.h"
#include "NvCTypes.h"
#include <stdint.h>


/**
Reauthor the provided asset to bond the specified support chunks to the world.

\param[in] asset					Pointer to the original asset. Won't be modified.
\param[in] worldBoundChunks			Array of support chunk indices which are to be bound to the world.
\param[in] worldBoundChunksCount	Size of worldBoundChunks array.
\param[in] bondDirections			Array of normals for each bond (size worldBoundChunksCount)
\param[in] bondUserData				Array of user data values for the new bonds, of size worldBoundChunksCount.  May be NULL.  If NULL, bond user data will be set to zero.

\return a new asset with added bonds if successful, NULL otherwise.
*/
NVBLAST_API NvBlastAsset* NvBlastExtAssetUtilsAddWorldBonds
(
	const NvBlastAsset* asset,
	const uint32_t* worldBoundChunks,
	uint32_t worldBoundChunkCount,
	const NvcVec3* bondDirections,
	const uint32_t* bondUserData
);


/**
Bond descriptor used to merge assets.

In addition to the NvBlastBondDesc fields, adds "component" indices to indicate
to which component asset the chunk indices in NvBlastBondDesc refer.  Used in the
function NvBlastExtAssetUtilsMergeAssets.
*/
struct NvBlastExtAssetUtilsBondDesc : public NvBlastBondDesc
{
	uint32_t	componentIndices[2];	//!< The asset component for the corresponding chunkIndices[2] value.
};


/**
Creates an asset descriptor which will build an asset that merges several assets.  Each asset (or component)
is given a transform, applied to the geometric information in the chunk and bond descriptors.

New bond descriptors may be given to bond support chunks from different components.

An NvBlastAsset may appear more than once in the components array.

This function will call NvBlastEnsureAssetExactSupportCoverage on the returned chunk descriptors.  It will also
call NvBlastReorderAssetDescChunks if the user passes in valid arrays for chunkReorderMap and chunkReorderMapSize.
Otherwise, the user must ensure that the returned chunk descriptors are in a valid order is valid before using them.

NOTE: This function allocates memory using the allocator in NvBlastGlobals, to create the new chunk and bond
descriptor arrays referenced in the returned NvBlastAssetDesc.  The user must free this memory after use with
NVBLAST_FREE appied to the pointers in the returned NvBlastAssetDesc.

\param[in]	components			An array of assets to merge, of size componentCount.
\param[in]	scales				An array of scales to apply to the geometric data in the chunks and bonds.
								If NULL, no scales are applied.  If not NULL, the array must be of size componentCount.
\param[in]	rotations			An array of rotations to apply to the geometric data in the chunks and bonds,
								stored quaternion format. The quaternions MUST be normalized.  If NULL, no rotations are applied.
								If not NULL, the array must be of size componentCount.
\param[in]	translations		An array of translations to apply to the geometric data in the chunks and bonds.
								If NULL, no translations are applied.  If not NULL, the array must be of size componentCount.
\param[in]	componentCount		The size of the components and relativeTransforms arrays.
\param[in]	newBondDescs		Descriptors of type NvBlastExtAssetUtilsBondDesc for new bonds between components, of size newBondCount.  If NULL, newBondCount must be 0.
\param[in]	newBondCount		The size of the newBondDescs array.
\param[in]	chunkIndexOffsets	If not NULL, must point to a uin32_t array of size componentCount.  It will be filled with the starting elements in chunkReorderMap corresponding to
								each component.
\param[in]	chunkReorderMap		If not NULL, the returned descriptor is run through NvBlastReorderAssetDescChunks, to ensure that it is a valid asset descriptor.  In the process, chunks
								may be reordered (in addition to their natural re-indexing due to them all being placed in one array).  To map from the old chunk indexing for the various
								component assets to the chunk indexing used in the returned descriptor, set chunkReorderMap to point to a uin32_t array of size equal to the total number
								of chunks in all components, and pass in a non-NULL value to chunkIndexOffsets as described above.  Then, for component index c and chunk index k within
								that component, the new chunk index is given by: index = chunkReorderMap[ k + chunkIndexOffsets[c] ].
\param[in]	chunkReorderMapSize	The size of the array passed into chunkReorderMap, if chunkReorderMap is not NULL.  This is for safety, so that this function does not overwrite chunkReorderMap.

\return an asset descriptor that will build an asset which merges the components, using NvBlastCreateAsset.
*/
NVBLAST_API NvBlastAssetDesc NvBlastExtAssetUtilsMergeAssets
(
	const NvBlastAsset** components,
	const NvcVec3* scales,
	const NvcQuat* rotations,
	const NvcVec3* translations,
	uint32_t componentCount,
	const NvBlastExtAssetUtilsBondDesc* newBondDescs,
	uint32_t newBondCount,
	uint32_t* chunkIndexOffsets,
	uint32_t* chunkReorderMap,
	uint32_t chunkReorderMapSize
);


/**
Transforms asset in place using scale, rotation, transform. 
Chunk centroids, chunk bond centroids and bond normals are being transformed.
Chunk volume and bond area are changed accordingly.

\param[in, out]	asset		Pointer to the asset to be transformed (modified).
\param[in]		scale		Pointer to scale to be applied. Can be nullptr.
\param[in]		rotation	Pointer to rotation to be applied. Can be nullptr.
\param[in]		translation	Pointer to translation to be applied. Can be nullptr.
*/
NVBLAST_API void NvBlastExtAssetTransformInPlace
(
	NvBlastAsset* asset,
	const NvcVec3* scale,
	const NvcQuat* rotation,
	const NvcVec3* translation
);

#endif // ifndef NVBLASTEXTASSETUTILS_H