binaries/assimp-3.1.1/code/FindInstancesProcess.h

/*
Open Asset Import Library (assimp)
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All rights reserved.

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  following disclaimer.

* Redistributions in binary form must reproduce the above
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*/

/** @file  FindInstancesProcess.h
 *  @brief Declares the aiProcess_FindInstances post-process step
 */
#ifndef AI_FINDINSTANCES_H_INC
#define AI_FINDINSTANCES_H_INC

#include "BaseProcess.h"
#include "ProcessHelper.h"

class FindInstancesProcessTest;
namespace Assimp	{

// -------------------------------------------------------------------------------
/** @brief Get a pseudo(!)-hash representing a mesh.
 *
 *  The hash is built from number of vertices, faces, primitive types,
 *  .... but *not* from the real mesh data. The funcction is not a perfect hash.
 *  @param in Input mesh
 *  @return Hash. 
 */
inline uint64_t GetMeshHash(aiMesh* in) 
{
	ai_assert(NULL != in);

	// ... get an unique value representing the vertex format of the mesh
	const unsigned int fhash = GetMeshVFormatUnique(in);

	// and bake it with number of vertices/faces/bones/matidx/ptypes
	return ((uint64_t)fhash << 32u) | ((
		(in->mNumBones << 16u) ^  (in->mNumVertices)       ^
		(in->mNumFaces<<4u)    ^  (in->mMaterialIndex<<15) ^
		(in->mPrimitiveTypes<<28)) & 0xffffffff );
}

// -------------------------------------------------------------------------------
/** @brief Perform a component-wise comparison of two arrays
 *
 *  @param first First array
 *  @param second Second aray
 *  @param size Size of both arrays
 *  @param e Epsilon
 *  @return true if the arrays are identical
 */
inline bool CompareArrays(const aiVector3D* first, const aiVector3D* second, 
	unsigned int size, float e) 
{
	for (const aiVector3D* end = first+size; first != end; ++first,++second) {
		if ( (*first - *second).SquareLength() >= e)
			return false;
	}
	return true;
}

// and the same for colors ...
inline bool CompareArrays(const aiColor4D* first, const aiColor4D* second, 
	unsigned int size, float e) 
{
	for (const aiColor4D* end = first+size; first != end; ++first,++second) {
		if ( GetColorDifference(*first,*second) >= e)
			return false;
	}
	return true;
}

// ---------------------------------------------------------------------------
/** @brief A post-processing steps to search for instanced meshes
*/
class FindInstancesProcess : public BaseProcess
{
public:

	FindInstancesProcess();
	~FindInstancesProcess();

public:
	// -------------------------------------------------------------------
	// Check whether step is active in given flags combination
	bool IsActive( unsigned int pFlags) const;

	// -------------------------------------------------------------------
	// Execute step on a given scene
	void Execute( aiScene* pScene);

	// -------------------------------------------------------------------
	// Setup properties prior to executing the process
	void SetupProperties(const Importer* pImp);

private:

	bool configSpeedFlag;

}; // ! end class FindInstancesProcess
}  // ! end namespace Assimp

#endif // !! AI_FINDINSTANCES_H_INC