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/*
* Copyright (C) 2008 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.example.android.apis.graphics.kube;
/**
*
* A 4x4 float matrix
*
*/
public class M4 {
public float[][] m = new float[4][4];
public M4() {
}
public M4(M4 other) {
for (int i = 0; i < 4; i++) {
for (int j = 0; j < 4; j++) {
m[i][j] = other.m[i][j];
}
}
}
public void multiply(GLVertex src, GLVertex dest) {
dest.x = src.x * m[0][0] + src.y * m[1][0] + src.z * m[2][0] + m[3][0];
dest.y = src.x * m[0][1] + src.y * m[1][1] + src.z * m[2][1] + m[3][1];
dest.z = src.x * m[0][2] + src.y * m[1][2] + src.z * m[2][2] + m[3][2];
}
public M4 multiply(M4 other) {
M4 result = new M4();
float[][] m1 = m;
float[][] m2 = other.m;
for (int i = 0; i < 4; i++) {
for (int j = 0; j < 4; j++) {
result.m[i][j] = m1[i][0]*m2[0][j] + m1[i][1]*m2[1][j] + m1[i][2]*m2[2][j] + m1[i][3]*m2[3][j];
}
}
return result;
}
public void setIdentity() {
for (int i = 0; i < 4; i++) {
for (int j = 0; j < 4; j++) {
m[i][j] = (i == j ? 1f : 0f);
}
}
}
@Override
public String toString() {
StringBuilder builder = new StringBuilder("[ ");
for (int i = 0; i < 4; i++) {
for (int j = 0; j < 4; j++) {
builder.append(m[i][j]);
builder.append(" ");
}
if (i < 2)
builder.append("\n ");
}
builder.append(" ]");
return builder.toString();
}
}
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