camera.h

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#pragma once
#ifndef AI_CAMERA_H_INC
#define AI_CAMERA_H_INC

#include "types.h"

#ifdef __cplusplus
extern "C" {
#endif

// ---------------------------------------------------------------------------
struct aiCamera
{
    C_STRUCT aiString mName;

    C_STRUCT aiVector3D mPosition;


    C_STRUCT aiVector3D mUp;


    C_STRUCT aiVector3D mLookAt;


    float mHorizontalFOV;

    float mClipPlaneNear;

    float mClipPlaneFar;


    float mAspect;

#ifdef __cplusplus

    aiCamera()
        : mUp               (0.f,1.f,0.f)
        , mLookAt           (0.f,0.f,1.f)
        , mHorizontalFOV    (0.25f * (float)AI_MATH_PI)
        , mClipPlaneNear    (0.1f)
        , mClipPlaneFar     (1000.f)
        , mAspect           (0.f)
    {}

    void GetCameraMatrix (aiMatrix4x4& out) const
    {
        aiVector3D zaxis = mLookAt;     zaxis.Normalize();
        aiVector3D yaxis = mUp;         yaxis.Normalize();
        aiVector3D xaxis = mUp^mLookAt; xaxis.Normalize();

        out.a4 = -(xaxis * mPosition);
        out.b4 = -(yaxis * mPosition);
        out.c4 = -(zaxis * mPosition);

        out.a1 = xaxis.x;
        out.a2 = xaxis.y;
        out.a3 = xaxis.z;

        out.b1 = yaxis.x;
        out.b2 = yaxis.y;
        out.b3 = yaxis.z;

        out.c1 = zaxis.x;
        out.c2 = zaxis.y;
        out.c3 = zaxis.z;

        out.d1 = out.d2 = out.d3 = 0.f;
        out.d4 = 1.f;
    }

#endif
};


#ifdef __cplusplus
}
#endif

#endif // AI_CAMERA_H_INC