Matrix.cpp revision 85bf02fc16784d935fb9eebfa9cb20fe46ff7951 
1/*
2 * Copyright (C) 2010 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#define LOG_TAG "UIMatrix"
18
19#include <math.h>
20#include <stdlib.h>
21
22#include <utils/Log.h>
23
24#include "Matrix.h"
25
26namespace android {
27
28void Matrix4::loadIdentity() {
29	mMat[0]  = 1;
30	mMat[1]  = 0;
31	mMat[2]  = 0;
32	mMat[3]  = 0;
33
34	mMat[4]  = 0;
35	mMat[5]  = 1;
36	mMat[6]  = 0;
37	mMat[7]  = 0;
38
39	mMat[8]  = 0;
40	mMat[9]  = 0;
41	mMat[10] = 1;
42	mMat[11] = 0;
43
44	mMat[12] = 0;
45	mMat[13] = 0;
46	mMat[14] = 0;
47	mMat[15] = 1;
48}
49
50void Matrix4::load(const float* v) {
51	memcpy(mMat, v, sizeof(mMat));
52}
53
54void Matrix4::load(const Matrix4& v) {
55	memcpy(mMat, v.mMat, sizeof(mMat));
56}
57
58void Matrix4::copyTo(float* v) const {
59	memcpy(v, mMat, sizeof(mMat));
60}
61
62void Matrix4::loadTranslate(float x, float y, float z) {
63	loadIdentity();
64	mMat[12] = x;
65	mMat[13] = y;
66	mMat[14] = z;
67}
68
69void Matrix4::loadScale(float sx, float sy, float sz) {
70	loadIdentity();
71	mMat[0]  = sx;
72	mMat[5]  = sy;
73	mMat[10] = sz;
74}
75
76void Matrix4::loadRotate(float angle, float x, float y, float z) {
77	mMat[3]  = 0;
78	mMat[7]  = 0;
79	mMat[11] = 0;
80	mMat[12] = 0;
81	mMat[13] = 0;
82	mMat[14] = 0;
83	mMat[15] = 1;
84
85	angle *= float(M_PI / 180.0f);
86	float c = cosf(angle);
87	float s = sinf(angle);
88
89	const float length = sqrtf(x * x + y * y + z * z);
90	const float nc = 1.0f - c;
91	const float xy = x * y;
92	const float yz = y * z;
93	const float zx = z * x;
94	const float xs = x * s;
95	const float ys = y * s;
96	const float zs = z * s;
97
98	mMat[0]  = x * x * nc +  c;
99	mMat[4]  =    xy * nc - zs;
100	mMat[8]  =    zx * nc + ys;
101	mMat[1]  =    xy * nc + zs;
102	mMat[5]  = y * y * nc +  c;
103	mMat[9]  =    yz * nc - xs;
104	mMat[2]  =    zx * nc - ys;
105	mMat[6]  =    yz * nc + xs;
106	mMat[10] = z * z * nc +  c;
107}
108
109void Matrix4::loadMultiply(const Matrix4& u, const Matrix4& v) {
110    for (int i = 0 ; i < 4 ; i++) {
111        float x = 0;
112        float y = 0;
113        float z = 0;
114        float w = 0;
115
116        for (int j = 0 ; j < 4 ; j++) {
117            const float e = v.get(i,j);
118            x += u.get(j, 0) * e;
119            y += u.get(j, 1) * e;
120            z += u.get(j, 2) * e;
121            w += u.get(j, 3) * e;
122        }
123
124        set(i, 0, x);
125        set(i, 1, y);
126        set(i, 2, z);
127        set(i, 3, w);
128    }
129}
130
131void Matrix4::loadOrtho(float left, float right, float bottom, float top, float near, float far) {
132    loadIdentity();
133    mMat[0]  = 2 / (right - left);
134    mMat[5]  = 2 / (top - bottom);
135    mMat[10] = -2 / (far - near);
136    mMat[12] = -(right + left) / (right - left);
137    mMat[13] = -(top + bottom) / (top - bottom);
138    mMat[14] = -(far + near) / (far - near);
139}
140
141void Matrix4::dump() const {
142	LOGD("%f %f %f %f", mMat[0], mMat[4], mMat[ 8], mMat[12]);
143	LOGD("%f %f %f %f", mMat[1], mMat[5], mMat[ 9], mMat[13]);
144	LOGD("%f %f %f %f", mMat[2], mMat[6], mMat[10], mMat[14]);
145	LOGD("%f %f %f %f", mMat[3], mMat[7], mMat[11], mMat[15]);
146}
147
148};
149