|
1
|
///////////////////////////////////////////////////////////////////////////////////////////////////
|
|
2
|
// Copyright 2017 Leszek Koltunski leszek@koltunski.pl //
|
|
3
|
// //
|
|
4
|
// This file is part of Distorted. //
|
|
5
|
// //
|
|
6
|
// This library is free software; you can redistribute it and/or //
|
|
7
|
// modify it under the terms of the GNU Lesser General Public //
|
|
8
|
// License as published by the Free Software Foundation; either //
|
|
9
|
// version 2.1 of the License, or (at your option) any later version. //
|
|
10
|
// //
|
|
11
|
// This library is distributed in the hope that it will be useful, //
|
|
12
|
// but WITHOUT ANY WARRANTY; without even the implied warranty of //
|
|
13
|
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU //
|
|
14
|
// Lesser General Public License for more details. //
|
|
15
|
// //
|
|
16
|
// You should have received a copy of the GNU Lesser General Public //
|
|
17
|
// License along with this library; if not, write to the Free Software //
|
|
18
|
// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA //
|
|
19
|
///////////////////////////////////////////////////////////////////////////////////////////////////
|
|
20
|
|
|
21
|
package org.distorted.library.effect;
|
|
22
|
|
|
23
|
import org.distorted.library.type.Data1D;
|
|
24
|
import org.distorted.library.type.Data3D;
|
|
25
|
import org.distorted.library.type.Data4D;
|
|
26
|
|
|
27
|
///////////////////////////////////////////////////////////////////////////////////////////////////
|
|
28
|
/**
|
|
29
|
* Pull all points around the center of the Effect towards the center point (if degree>=1) or push them
|
|
30
|
* away from it (degree<=1).
|
|
31
|
*/
|
|
32
|
public class VertexEffectSink extends VertexEffect
|
|
33
|
{
|
|
34
|
private static final EffectName NAME = EffectName.SINK;
|
|
35
|
|
|
36
|
private final Data1D mSink;
|
|
37
|
private final Data3D mCenter;
|
|
38
|
private final Data4D mRegion;
|
|
39
|
|
|
40
|
///////////////////////////////////////////////////////////////////////////////////////////////////
|
|
41
|
/**
|
|
42
|
* Only for use by the library itself.
|
|
43
|
*
|
|
44
|
* @y.exclude
|
|
45
|
*/
|
|
46
|
public boolean compute(float[] uniforms, int index, long currentDuration, long step )
|
|
47
|
{
|
|
48
|
mCenter.get(uniforms,index+CENTER_OFFSET,currentDuration,step);
|
|
49
|
mRegion.get(uniforms,index+REGION_OFFSET,currentDuration,step);
|
|
50
|
return mSink.get(uniforms,index+VALUES_OFFSET,currentDuration,step);
|
|
51
|
}
|
|
52
|
|
|
53
|
///////////////////////////////////////////////////////////////////////////////////////////////////
|
|
54
|
|
|
55
|
static String code()
|
|
56
|
{
|
|
57
|
return
|
|
58
|
|
|
59
|
"vec3 ps = vUniforms[effect+1].yzw - v; \n"
|
|
60
|
+ "float h = vUniforms[effect].x; \n"
|
|
61
|
+ "float deg = degree(vUniforms[effect+2],ps); \n"
|
|
62
|
+ "float t = deg * (1.0-h)/max(1.0,h); \n"
|
|
63
|
+ "v += t*ps; \n"
|
|
64
|
|
|
65
|
+ "const float A = 1.6; \n" // max amount of change in normal vector when pulling
|
|
66
|
+ "const float B = 10.0; \n" // when pushing
|
|
67
|
+ "vec3 n_ps = dot(ps,n)*ps; \n" // n_ps = (component of n that's parallel to ps) * |ps|^2 (=dot(ps,ps))
|
|
68
|
+ "float dot_ps = dot(ps,ps); \n"
|
|
69
|
+ "float sign_ps= sign(dot_ps); \n"
|
|
70
|
+ "n_ps = (sign_ps*n_ps)/(dot_ps-(sign_ps-1.0)); \n" // uff! now n_ps is the parallel to ps component of n, even if ps==0
|
|
71
|
+ "float move = deg*(h-1.0)/(h/B+1.0/A); \n" // move(0)=-A*deg, move(1)=0, move(inf)=B*deg
|
|
72
|
+ "n += move*n_ps; \n"
|
|
73
|
+ "n = normalize(n);";
|
|
74
|
}
|
|
75
|
|
|
76
|
///////////////////////////////////////////////////////////////////////////////////////////////////
|
|
77
|
// PUBLIC API
|
|
78
|
///////////////////////////////////////////////////////////////////////////////////////////////////
|
|
79
|
// Pull P=(v.x,v.y) towards center of the effect with P' = P + (1-h)*dist(S-P)
|
|
80
|
// when h>1 we are pushing points away from S: P' = P + (1/h-1)*dist(S-P)
|
|
81
|
///////////////////////////////////////////////////////////////////////////////////////////////////
|
|
82
|
/**
|
|
83
|
* Have to call this before the shaders get compiled (i.e before DistortedLibrary.onCreate()) for the Effect to work.
|
|
84
|
*/
|
|
85
|
public static void enable()
|
|
86
|
{
|
|
87
|
addEffect(NAME, code() );
|
|
88
|
}
|
|
89
|
|
|
90
|
///////////////////////////////////////////////////////////////////////////////////////////////////
|
|
91
|
/**
|
|
92
|
* Pull all points around the center of the Effect towards the center point (if degree>=1) or push them
|
|
93
|
* away from it (degree<=1)
|
|
94
|
*
|
|
95
|
* @param sink The current degree of the Effect.
|
|
96
|
* @param center 3-dimensional Data that, at any given time, returns the Center of the Effect.
|
|
97
|
* @param region Region that masks the Effect.
|
|
98
|
*/
|
|
99
|
public VertexEffectSink(Data1D sink, Data3D center, Data4D region)
|
|
100
|
{
|
|
101
|
super(NAME);
|
|
102
|
mSink = sink;
|
|
103
|
mCenter = center;
|
|
104
|
mRegion = (region==null ? MAX_REGION : region);
|
|
105
|
}
|
|
106
|
|
|
107
|
///////////////////////////////////////////////////////////////////////////////////////////////////
|
|
108
|
/**
|
|
109
|
* Pull all points around the center of the Effect towards the center point(if degree>=1) or push them
|
|
110
|
* away from it (degree<=1)
|
|
111
|
*
|
|
112
|
* @param sink The current degree of the Effect.
|
|
113
|
* @param center 3-dimensional Data that, at any given time, returns the Center of the Effect.
|
|
114
|
*/
|
|
115
|
public VertexEffectSink(Data1D sink, Data3D center)
|
|
116
|
{
|
|
117
|
super(NAME);
|
|
118
|
mSink = sink;
|
|
119
|
mCenter = center;
|
|
120
|
mRegion = MAX_REGION;
|
|
121
|
}
|
|
122
|
}
|