Matrix4x4Negative.h

Go to the documentation of this file.

#pragma once
 
#include <tdme/tdme.h>
#include <tdme/math/fwd-tdme.h>
#include <tdme/math/Matrix4x4.h>
#include <tdme/math/Vector3.h>
 
using tdme::math::Matrix4x4;
using tdme::math::Vector3;
 
/**
 * Simple class to determine if a transform is negative
 * @author Andreas Drewke
 * @version $Id$
 */
class tdme::math::Matrix4x4Negative
{
private:
    Vector3 xAxis;
    Vector3 yAxis;
    Vector3 zAxis;
 
public:
    /**
     * Public constructor
     */
    inline Matrix4x4Negative() {
    }
 
    /**
     * Check if matrix is negative
     * @param matrix matrix
     * @return negative
     */
    inline bool isNegative(Matrix4x4& matrix) {
        // check if negative scale and rotation
        auto& transformationsMatrixData = matrix.getArray();
        // copy into x,y,z axes
        xAxis.set(transformationsMatrixData[0], transformationsMatrixData[1], transformationsMatrixData[2]);
        yAxis.set(transformationsMatrixData[4], transformationsMatrixData[5], transformationsMatrixData[6]);
        zAxis.set(transformationsMatrixData[8], transformationsMatrixData[9], transformationsMatrixData[10]);
        // check if inverted/negative transformation
        return Vector3::computeDotProduct(Vector3::computeCrossProduct(xAxis, yAxis), zAxis) < 0.0f;
    }
 
};