zenilib: zenilib/jni/external/lib3ds/src/lib3ds_math.c Source File

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lib3ds_math.c
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1 /*
2 Copyright (C) 1996-2008 by Jan Eric Kyprianidis <www.kyprianidis.com>
3 All rights reserved.
4
5 This program is free software: you can redistribute it and/or modify
6 it under the terms of the GNU Lesser General Public License as published
7 by the Free Software Foundation, either version 2.1 of the License, or
8 (at your option) any later version.
9
10 Thisprogram is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public License
16 along with this program; If not, see <http://www.gnu.org/licenses/>.
17 */
18 #include "lib3ds_impl.h"
19
20
21 float
22 lib3ds_math_ease(float fp, float fc, float fn, float ease_from, float ease_to) {
23 double s, step;
24 double tofrom;
25 double a;
26
27 s = step = (float)(fc - fp) / (fn - fp);
28 tofrom = ease_to + ease_from;
29 if (tofrom != 0.0) {
30 if (tofrom > 1.0) {
31 ease_to = (float)(ease_to / tofrom);
32 ease_from = (float)(ease_from / tofrom);
33 }
34 a = 1.0 / (2.0 - (ease_to + ease_from));
35
36 if (step < ease_from) s = a / ease_from * step * step;
37 else {
38 if ((1.0 - ease_to) <= step) {
39 step = 1.0 - step;
40 s = 1.0 - a / ease_to * step * step;
41 } else {
42 s = ((2.0 * step) - ease_from) * a;
43 }
44 }
45 }
46 return((float)s);
47 }
48
49
50 void
51 lib3ds_math_cubic_interp(float *v, float *a, float *p, float *q, float *b, int n, float t) {
52 float x, y, z, w;
53 int i;
54
55 x = 2 * t * t * t - 3 * t * t + 1;
56 y = -2 * t * t * t + 3 * t * t;
57 z = t * t * t - 2 * t * t + t;
58 w = t * t * t - t * t;
59 for (i = 0; i < n; ++i) {
60 v[i] = x * a[i] + y * b[i] + z * p[i] + w * q[i];
61 }
62 }
lib3ds_math_cubic_interp
LIB3DSAPI void lib3ds_math_cubic_interp(float *v, float *a, float *p, float *q, float *b, int n, float t)
Definition: lib3ds_math.c:51
s
GLdouble s
Definition: glew.h:1376
lib3ds_math_ease
LIB3DSAPI float lib3ds_math_ease(float fp, float fc, float fn, float ease_from, float ease_to)
Definition: lib3ds_math.c:22
n
GLclampd n
Definition: glew.h:7287
x
EGLSurface EGLint x
Definition: eglext.h:293
t
GLdouble GLdouble t
Definition: glew.h:1384
a
GLboolean GLboolean GLboolean GLboolean a
Definition: glew.h:8736
v
const GLdouble * v
Definition: glew.h:1377
p
GLfloat GLfloat p
Definition: glew.h:14938
y
EGLSurface EGLint EGLint y
Definition: eglext.h:293
q
GLdouble GLdouble GLdouble GLdouble q
Definition: glew.h:1400
b
GLdouble GLdouble GLdouble b
Definition: glew.h:8383
z
GLint GLint GLint GLint z
Definition: gl2ext.h:1214
w
GLint GLint GLint GLint GLint w
Definition: gl2ext.h:1215
i
int i
Definition: pngrutil.c:1377
lib3ds_impl.h