/*
Open Asset Import Library (assimp)
----------------------------------------------------------------------

Copyright (c) 2006-2016, assimp team
All rights reserved.

Redistribution and use of this software in source and binary forms,
with or without modification, are permitted provided that the
following conditions are met:

* Redistributions of source code must retain the above
  copyright notice, this list of conditions and the
  following disclaimer.

* Redistributions in binary form must reproduce the above
  copyright notice, this list of conditions and the
  following disclaimer in the documentation and/or other
  materials provided with the distribution.

* Neither the name of the assimp team, nor the names of its
  contributors may be used to endorse or promote products
  derived from this software without specific prior
  written permission of the assimp team.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

----------------------------------------------------------------------
*/


/** @file Defines a post processing step to calculate tangents and
    bitangents on all imported meshes.*/
#ifndef AI_CALCTANGENTSPROCESS_H_INC
#define AI_CALCTANGENTSPROCESS_H_INC

#include "BaseProcess.h"

struct aiMesh;

namespace Assimp
{

// ---------------------------------------------------------------------------
/** The CalcTangentsProcess calculates the tangent and bitangent for any vertex
 * of all meshes. It is expected to be run before the JoinVerticesProcess runs
 * because the joining of vertices also considers tangents and bitangents for
 * uniqueness.
 */
class ASSIMP_API_WINONLY CalcTangentsProcess : public BaseProcess
{
public:

    CalcTangentsProcess();
    ~CalcTangentsProcess();

public:
    // -------------------------------------------------------------------
    /** Returns whether the processing step is present in the given flag.
    * @param pFlags The processing flags the importer was called with.
    *   A bitwise combination of #aiPostProcessSteps.
    * @return true if the process is present in this flag fields,
    *   false if not.
    */
    bool IsActive( unsigned int pFlags) const;

    // -------------------------------------------------------------------
    /** Called prior to ExecuteOnScene().
    * The function is a request to the process to update its configuration
    * basing on the Importer's configuration property list.
    */
    void SetupProperties(const Importer* pImp);


    // setter for configMaxAngle
    inline void SetMaxSmoothAngle(float f)
    {
        configMaxAngle =f;
    }

protected:

    // -------------------------------------------------------------------
    /** Calculates tangents and bitangents for a specific mesh.
    * @param pMesh The mesh to process.
    * @param meshIndex Index of the mesh
    */
    bool ProcessMesh( aiMesh* pMesh, unsigned int meshIndex);

    // -------------------------------------------------------------------
    /** Executes the post processing step on the given imported data.
    * @param pScene The imported data to work at.
    */
    void Execute( aiScene* pScene);

private:

    /** Configuration option: maximum smoothing angle, in radians*/
    float configMaxAngle;
    unsigned int configSourceUV;
};

} // end of namespace Assimp

#endif // AI_CALCTANGENTSPROCESS_H_INC
