/**
* Set the source matrix to be the identity matrix.
*
* @param src The matrix to set to the identity.
* @return The source matrix
*/
public static Matrix2f setIdentity(Matrix2f src) {
src.m00 = 1.0f;
src.m01 = 0.0f;
src.m10 = 0.0f;
src.m11 = 1.0f;
return src;
}
public static Matrix2f setZero(Matrix2f src) {
src.m00 = 0.0f;
src.m01 = 0.0f;
src.m10 = 0.0f;
src.m11 = 0.0f;
return src;
}
/**
* Copy the source matrix to the destination matrix.
*
* @param src The source matrix
* @param dest The destination matrix, or null if a new one should be created.
* @return The copied matrix
*/
public static Matrix2f load(Matrix2f src, Matrix2f dest) {
if (dest == null) dest = new Matrix2f();
dest.m00 = src.m00;
dest.m01 = src.m01;
dest.m10 = src.m10;
dest.m11 = src.m11;
return dest;
}
/**
* Subtract the right matrix from the left and place the result in a third matrix.
*
* @param left The left source matrix
* @param right The right source matrix
* @param dest The destination matrix, or null if a new one is to be created
* @return the destination matrix
*/
public static Matrix2f sub(Matrix2f left, Matrix2f right, Matrix2f dest) {
if (dest == null) dest = new Matrix2f();
dest.m00 = left.m00 - right.m00;
dest.m01 = left.m01 - right.m01;
dest.m10 = left.m10 - right.m10;
dest.m11 = left.m11 - right.m11;
return dest;
}
/**
* Add two matrices together and place the result in a third matrix.
*
* @param left The left source matrix
* @param right The right source matrix
* @param dest The destination matrix, or null if a new one is to be created
* @return the destination matrix
*/
public static Matrix2f add(Matrix2f left, Matrix2f right, Matrix2f dest) {
if (dest == null) dest = new Matrix2f();
dest.m00 = left.m00 + right.m00;
dest.m01 = left.m01 + right.m01;
dest.m10 = left.m10 + right.m10;
dest.m11 = left.m11 + right.m11;
return dest;
}
/**
* Transpose the source matrix and place the result in the destination matrix.
*
* @param src The source matrix or null if a new matrix is to be created
* @param dest The destination matrix or null if a new matrix is to be created
* @return the transposed matrix
*/
public static Matrix2f transpose(Matrix2f src, Matrix2f dest) {
if (dest == null) dest = new Matrix2f();
float m01 = src.m10;
float m10 = src.m01;
dest.m01 = m01;
dest.m10 = m10;
return dest;
}
/**
* Multiply the right matrix by the left and place the result in a third matrix.
*
* @param left The left source matrix
* @param right The right source matrix
* @param dest The destination matrix, or null if a new one is to be created
* @return the destination matrix
*/
public static Matrix2f mul(Matrix2f left, Matrix2f right, Matrix2f dest) {
if (dest == null) dest = new Matrix2f();
float m00 = left.m00 * right.m00 + left.m10 * right.m01;
float m01 = left.m01 * right.m00 + left.m11 * right.m01;
float m10 = left.m00 * right.m10 + left.m10 * right.m11;
float m11 = left.m01 * right.m10 + left.m11 * right.m11;
dest.m00 = m00;
dest.m01 = m01;
dest.m10 = m10;
dest.m11 = m11;
return dest;
}
/**
* Invert the source matrix and place the result in the destination matrix.
*
* @param src The source matrix to be inverted
* @param dest The destination matrix or null if a new matrix is to be created
* @return The inverted matrix, or null if source can't be reverted.
*/
public static Matrix2f invert(Matrix2f src, Matrix2f dest) {
/*
*inv(A) = 1/det(A) * adj(A);
*/
float determinant = src.determinant();
if (determinant != 0) {
if (dest == null) dest = new Matrix2f();
float determinant_inv = 1f / determinant;
float t00 = src.m11 * determinant_inv;
float t01 = -src.m01 * determinant_inv;
float t11 = src.m00 * determinant_inv;
float t10 = -src.m10 * determinant_inv;
dest.m00 = t00;
dest.m01 = t01;
dest.m10 = t10;
dest.m11 = t11;
return dest;
} else return null;
}
