105 lines
2.5 KiB
Java
105 lines
2.5 KiB
Java
/*
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* Pixel Dungeon
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* Copyright (C) 2012-2015 Oleg Dolya
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*
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* Shattered Pixel Dungeon
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* Copyright (C) 2014-2019 Evan Debenham
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>
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*/
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package com.watabou.glwrap;
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public class Matrix {
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public static final float G2RAD = 0.01745329251994329576923690768489f;
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public static float[] clone( float[] m ) {
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int n = m.length;
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float[] res = new float[n];
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do {
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res[--n] = m[n];
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} while (n > 0);
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return res;
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}
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public static void copy( float[] src, float[] dst ) {
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int n = src.length;
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do {
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dst[--n] = src[n];
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} while (n > 0);
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}
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private static float[] identity = new float[]{
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1, 0, 0, 0,
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0, 1, 0, 0,
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0, 0, 1, 0,
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0, 0, 0, 1
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};
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public static void setIdentity( float[] m ) {
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System.arraycopy(identity, 0, m, 0, identity.length);
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}
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public static void rotate( float[] m, float a ) {
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a *= G2RAD;
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float sin = (float)Math.sin( a );
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float cos = (float)Math.cos( a );
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float m0 = m[0];
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float m1 = m[1];
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float m4 = m[4];
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float m5 = m[5];
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m[0] = m0 * cos + m4 * sin;
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m[1] = m1 * cos + m5 * sin;
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m[4] = -m0 * sin + m4 * cos;
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m[5] = -m1 * sin + m5 * cos;
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}
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public static void skewX( float[] m, float a ) {
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double t = Math.tan( a * G2RAD );
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m[4] += -m[0] * t;
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m[5] += -m[1] * t;
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}
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public static void skewY( float[] m, float a ) {
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double t = Math.tan( a * G2RAD );
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m[0] += m[4] * t;
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m[1] += m[5] * t;
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}
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public static void scale( float[] m, float x, float y ) {
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m[0] *= x;
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m[1] *= x;
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m[2] *= x;
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m[3] *= x;
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m[4] *= y;
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m[5] *= y;
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m[6] *= y;
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m[7] *= y;
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// android.opengl.Matrix.scaleM( m, 0, x, y, 1 );
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}
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public static void translate( float[] m, float x, float y ) {
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m[12] += m[0] * x + m[4] * y;
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m[13] += m[1] * x + m[5] * y;
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}
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public static void multiply( float[] left, float right[], float[] result ) {
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android.opengl.Matrix.multiplyMM( result, 0, left, 0, right, 0 );
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}
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} |