assimp/code/PostProcessing/ComputeUVMappingProcess.h

/*
Open Asset Import Library (assimp)
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*/

/** @file Defines a post processing step to compute UV coordinates
  from abstract mappings, such as box or spherical*/
#ifndef AI_COMPUTEUVMAPPING_H_INC
#define AI_COMPUTEUVMAPPING_H_INC

#include "Common/BaseProcess.h"

#include <assimp/mesh.h>
#include <assimp/material.h>
#include <assimp/types.h>

class ComputeUVMappingTest;

namespace Assimp {

// ---------------------------------------------------------------------------
/** ComputeUVMappingProcess - converts special mappings, such as spherical,
 *  cylindrical or boxed to proper UV coordinates for rendering.
*/
class ComputeUVMappingProcess : public BaseProcess {
public:
    ComputeUVMappingProcess() = default;
    ~ComputeUVMappingProcess() override = default;

    // -------------------------------------------------------------------
    /** Returns whether the processing step is present in the given flag field.
    * @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 override;

    // -------------------------------------------------------------------
    /** Executes the post processing step on the given imported data.
    * At the moment a process is not supposed to fail.
    * @param pScene The imported data to work at.
    */
    void Execute( aiScene* pScene) override;

protected:

    // -------------------------------------------------------------------
    /** Computes spherical UV coordinates for a mesh
     *
     *  @param mesh Mesh to be processed
     *  @param axis Main axis
     *  @param out Receives output UV coordinates
    */
    void ComputeSphereMapping(aiMesh* mesh,const aiVector3D& axis,
        aiVector3D* out);

    // -------------------------------------------------------------------
    /** Computes cylindrical UV coordinates for a mesh
     *
     *  @param mesh Mesh to be processed
     *  @param axis Main axis
     *  @param out Receives output UV coordinates
    */
    void ComputeCylinderMapping(aiMesh* mesh,const aiVector3D& axis,
        aiVector3D* out);

    // -------------------------------------------------------------------
    /** Computes planar UV coordinates for a mesh
     *
     *  @param mesh Mesh to be processed
     *  @param axis Main axis
     *  @param out Receives output UV coordinates
    */
    void ComputePlaneMapping(aiMesh* mesh,const aiVector3D& axis,
        aiVector3D* out);

    // -------------------------------------------------------------------
    /** Computes cubic UV coordinates for a mesh
     *
     *  @param mesh Mesh to be processed
     *  @param out Receives output UV coordinates
    */
    void ComputeBoxMapping(aiMesh* mesh, aiVector3D* out);

private:

    // temporary structure to describe a mapping
    struct MappingInfo {
        explicit MappingInfo(aiTextureMapping _type)
            : type  (_type)
            , axis  (0.f,1.f,0.f)
            , uv    (0u)
        {}

        aiTextureMapping type;
        aiVector3D axis;
        unsigned int uv;

        bool operator== (const MappingInfo& other) {
            return type == other.type && axis == other.axis;
        }
    };
};

} // end of namespace Assimp

#endif // AI_COMPUTEUVMAPPING_H_INC