Kobiware-Renderer/Matrix4f.java at main · KobiWare/Kobiware-Renderer · GitHub

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public class Matrix4f
{
    private float[][] m;

    public Matrix4f()
    {
        m = new float[4][4];
    }

    public Matrix4f InitIdentity()
    {
        m[0][0] = 1;	m[0][1] = 0;	m[0][2] = 0;	m[0][3] = 0;
        m[1][0] = 0;	m[1][1] = 1;	m[1][2] = 0;	m[1][3] = 0;
        m[2][0] = 0;	m[2][1] = 0;	m[2][2] = 1;	m[2][3] = 0;
        m[3][0] = 0;	m[3][1] = 0;	m[3][2] = 0;	m[3][3] = 1;

        return this;
    }

    public Matrix4f InitScreenSpaceTransform(float halfWidth, float halfHeight)
    {
        m[0][0] = halfWidth;	m[0][1] = 0;	m[0][2] = 0;	m[0][3] = halfWidth;
        m[1][0] = 0;	m[1][1] = -halfHeight;	m[1][2] = 0;	m[1][3] = halfHeight;
        m[2][0] = 0;	m[2][1] = 0;	m[2][2] = 1;	m[2][3] = 0;
        m[3][0] = 0;	m[3][1] = 0;	m[3][2] = 0;	m[3][3] = 1;

        return this;
    }

    public Matrix4f InitTranslation(float x, float y, float z)
    {
        m[0][0] = 1;	m[0][1] = 0;	m[0][2] = 0;	m[0][3] = x;
        m[1][0] = 0;	m[1][1] = 1;	m[1][2] = 0;	m[1][3] = y;
        m[2][0] = 0;	m[2][1] = 0;	m[2][2] = 1;	m[2][3] = z;
        m[3][0] = 0;	m[3][1] = 0;	m[3][2] = 0;	m[3][3] = 1;

        return this;
    }

    public Matrix4f InitRotation(float x, float y, float z, float angle)
    {
        float sin = (float)Math.sin(angle);
        float cos = (float)Math.cos(angle);

        m[0][0] = cos+x*x*(1-cos); m[0][1] = x*y*(1-cos)-z*sin; m[0][2] = x*z*(1-cos)+y*sin; m[0][3] = 0;
        m[1][0] = y*x*(1-cos)+z*sin; m[1][1] = cos+y*y*(1-cos);	m[1][2] = y*z*(1-cos)-x*sin; m[1][3] = 0;
        m[2][0] = z*x*(1-cos)-y*sin; m[2][1] = z*y*(1-cos)+x*sin; m[2][2] = cos+z*z*(1-cos); m[2][3] = 0;
        m[3][0] = 0;	m[3][1] = 0;	m[3][2] = 0;	m[3][3] = 1;

        return this;
    }

    public Matrix4f InitRotation(float x, float y, float z)
    {
        Matrix4f rx = new Matrix4f();
        Matrix4f ry = new Matrix4f();
        Matrix4f rz = new Matrix4f();

        rz.m[0][0] = (float)Math.cos(z);rz.m[0][1] = -(float)Math.sin(z);rz.m[0][2] = 0;				rz.m[0][3] = 0;
        rz.m[1][0] = (float)Math.sin(z);rz.m[1][1] = (float)Math.cos(z);rz.m[1][2] = 0;					rz.m[1][3] = 0;
        rz.m[2][0] = 0;					rz.m[2][1] = 0;					rz.m[2][2] = 1;					rz.m[2][3] = 0;
        rz.m[3][0] = 0;					rz.m[3][1] = 0;					rz.m[3][2] = 0;					rz.m[3][3] = 1;

        rx.m[0][0] = 1;					rx.m[0][1] = 0;					rx.m[0][2] = 0;					rx.m[0][3] = 0;
        rx.m[1][0] = 0;					rx.m[1][1] = (float)Math.cos(x);rx.m[1][2] = -(float)Math.sin(x);rx.m[1][3] = 0;
        rx.m[2][0] = 0;					rx.m[2][1] = (float)Math.sin(x);rx.m[2][2] = (float)Math.cos(x);rx.m[2][3] = 0;
        rx.m[3][0] = 0;					rx.m[3][1] = 0;					rx.m[3][2] = 0;					rx.m[3][3] = 1;

        ry.m[0][0] = (float)Math.cos(y);ry.m[0][1] = 0;					ry.m[0][2] = -(float)Math.sin(y);ry.m[0][3] = 0;
        ry.m[1][0] = 0;					ry.m[1][1] = 1;					ry.m[1][2] = 0;					ry.m[1][3] = 0;
        ry.m[2][0] = (float)Math.sin(y);ry.m[2][1] = 0;					ry.m[2][2] = (float)Math.cos(y);ry.m[2][3] = 0;
        ry.m[3][0] = 0;					ry.m[3][1] = 0;					ry.m[3][2] = 0;					ry.m[3][3] = 1;

        m = rz.Mul(ry.Mul(rx)).GetM();

        return this;
    }

    public Matrix4f InitScale(float x, float y, float z)
    {
        m[0][0] = x;	m[0][1] = 0;	m[0][2] = 0;	m[0][3] = 0;
        m[1][0] = 0;	m[1][1] = y;	m[1][2] = 0;	m[1][3] = 0;
        m[2][0] = 0;	m[2][1] = 0;	m[2][2] = z;	m[2][3] = 0;
        m[3][0] = 0;	m[3][1] = 0;	m[3][2] = 0;	m[3][3] = 1;

        return this;
    }

    public Matrix4f InitPerspective(float fov, float aspectRatio, float zNear, float zFar)
    {
        float tanHalfFOV = (float)Math.tan(fov / 2);
        float zRange = zNear - zFar;

        m[0][0] = 1.0f / (tanHalfFOV * aspectRatio);	m[0][1] = 0;					m[0][2] = 0;	m[0][3] = 0;
        m[1][0] = 0;						m[1][1] = 1.0f / tanHalfFOV;	m[1][2] = 0;	m[1][3] = 0;
        m[2][0] = 0;						m[2][1] = 0;					m[2][2] = (-zNear -zFar)/zRange;	m[2][3] = 2 * zFar * zNear / zRange;
        m[3][0] = 0;						m[3][1] = 0;					m[3][2] = 1;	m[3][3] = 0;


        return this;
    }

    public Matrix4f InitOrthographic(float left, float right, float bottom, float top, float near, float far)
    {
        float width = right - left;
        float height = top - bottom;
        float depth = far - near;

        m[0][0] = 2/width;m[0][1] = 0;	m[0][2] = 0;	m[0][3] = -(right + left)/width;
        m[1][0] = 0;	m[1][1] = 2/height;m[1][2] = 0;	m[1][3] = -(top + bottom)/height;
        m[2][0] = 0;	m[2][1] = 0;	m[2][2] = -2/depth;m[2][3] = -(far + near)/depth;
        m[3][0] = 0;	m[3][1] = 0;	m[3][2] = 0;	m[3][3] = 1;

        return this;
    }

    public Matrix4f InitRotation(Vector4f forward, Vector4f up)
    {
        Vector4f f = forward.Normalized();

        Vector4f r = up.Normalized();
        r = r.Cross(f);

        Vector4f u = f.Cross(r);

        return InitRotation(f, u, r);
    }

    public Matrix4f InitRotation(Vector4f forward, Vector4f up, Vector4f right)
    {
        Vector4f f = forward;
        Vector4f r = right;
        Vector4f u = up;

        m[0][0] = r.GetX();	m[0][1] = r.GetY();	m[0][2] = r.GetZ();	m[0][3] = 0;
        m[1][0] = u.GetX();	m[1][1] = u.GetY();	m[1][2] = u.GetZ();	m[1][3] = 0;
        m[2][0] = f.GetX();	m[2][1] = f.GetY();	m[2][2] = f.GetZ();	m[2][3] = 0;
        m[3][0] = 0;		m[3][1] = 0;		m[3][2] = 0;		m[3][3] = 1;

        return this;
    }

    public Vector4f Transform(Vector4f r)
    {
        return new Vector4f(m[0][0] * r.GetX() + m[0][1] * r.GetY() + m[0][2] * r.GetZ() + m[0][3] * r.GetW(),
                m[1][0] * r.GetX() + m[1][1] * r.GetY() + m[1][2] * r.GetZ() + m[1][3] * r.GetW(),
                m[2][0] * r.GetX() + m[2][1] * r.GetY() + m[2][2] * r.GetZ() + m[2][3] * r.GetW(),
                m[3][0] * r.GetX() + m[3][1] * r.GetY() + m[3][2] * r.GetZ() + m[3][3] * r.GetW());
    }

    public Matrix4f Mul(Matrix4f r)
    {
        Matrix4f res = new Matrix4f();

        for(int i = 0; i < 4; i++)
        {
            for(int j = 0; j < 4; j++)
            {
                res.Set(i, j, m[i][0] * r.Get(0, j) +
                        m[i][1] * r.Get(1, j) +
                        m[i][2] * r.Get(2, j) +
                        m[i][3] * r.Get(3, j));
            }
        }

        return res;
    }

    public float[][] GetM()
    {
        float[][] res = new float[4][4];

        for(int i = 0; i < 4; i++)
            for(int j = 0; j < 4; j++)
                res[i][j] = m[i][j];

        return res;
    }

    public float Get(int x, int y)
    {
        return m[x][y];
    }

    public void SetM(float[][] m)
    {
        this.m = m;
    }

    public void Set(int x, int y, float value)
    {
        m[x][y] = value;
    }
}