1 /* 2 * Copyright (C) 2008 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.example.android.apis.graphics.kube; 18 19 /** 20 * 21 * A 4x4 float matrix 22 * 23 */ 24 public class M4 { 25 public float[][] m = new float[4][4]; 26 27 public M4() { 28 } 29 30 public M4(M4 other) { 31 for (int i = 0; i < 4; i++) { 32 for (int j = 0; j < 4; j++) { 33 m[i][j] = other.m[i][j]; 34 } 35 } 36 } 37 38 public void multiply(GLVertex src, GLVertex dest) { 39 dest.x = src.x * m[0][0] + src.y * m[1][0] + src.z * m[2][0] + m[3][0]; 40 dest.y = src.x * m[0][1] + src.y * m[1][1] + src.z * m[2][1] + m[3][1]; 41 dest.z = src.x * m[0][2] + src.y * m[1][2] + src.z * m[2][2] + m[3][2]; 42 } 43 44 public M4 multiply(M4 other) { 45 M4 result = new M4(); 46 float[][] m1 = m; 47 float[][] m2 = other.m; 48 49 for (int i = 0; i < 4; i++) { 50 for (int j = 0; j < 4; j++) { 51 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]; 52 } 53 } 54 55 return result; 56 } 57 58 public void setIdentity() { 59 for (int i = 0; i < 4; i++) { 60 for (int j = 0; j < 4; j++) { 61 m[i][j] = (i == j ? 1f : 0f); 62 } 63 } 64 } 65 66 @Override 67 public String toString() { 68 StringBuilder builder = new StringBuilder("[ "); 69 for (int i = 0; i < 4; i++) { 70 for (int j = 0; j < 4; j++) { 71 builder.append(m[i][j]); 72 builder.append(" "); 73 } 74 if (i < 2) 75 builder.append("\n "); 76 } 77 builder.append(" ]"); 78 return builder.toString(); 79 } 80 } 81
