/src/main/java/org/distorted/library/effect/VertexEffectPinch.java - Annotate - Distorted Android

library / src / main / java / org / distorted / library / effect / VertexEffectPinch.java @ 0f10a0b6

1	125cee3d	Leszek Koltunski	///////////////////////////////////////////////////////////////////////////////////////////////////
2			// Copyright 2017 Leszek Koltunski //
3			// //
4	46b572b5	Leszek Koltunski	// This file is part of Distorted. //
5	125cee3d	Leszek Koltunski	// //
6	46b572b5	Leszek Koltunski	// Distorted is free software: you can redistribute it and/or modify //
7	125cee3d	Leszek Koltunski	// it under the terms of the GNU General Public License as published by //
8			// the Free Software Foundation, either version 2 of the License, or //
9			// (at your option) any later version. //
10			// //
11	46b572b5	Leszek Koltunski	// Distorted is distributed in the hope that it will be useful, //
12	125cee3d	Leszek Koltunski	// but WITHOUT ANY WARRANTY; without even the implied warranty of //
13			// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the //
14			// GNU General Public License for more details. //
15			// //
16			// You should have received a copy of the GNU General Public License //
17	46b572b5	Leszek Koltunski	// along with Distorted. If not, see <http://www.gnu.org/licenses/>. //
18	125cee3d	Leszek Koltunski	///////////////////////////////////////////////////////////////////////////////////////////////////
19
20			package org.distorted.library.effect;
21
22			import org.distorted.library.type.Data3D;
23			import org.distorted.library.type.Data4D;
24
25			///////////////////////////////////////////////////////////////////////////////////////////////////
26	faa3ff56	Leszek Koltunski	/**
27			* Pull all points around the center of the Effect towards a line passing through the center
28			* (that's if degree>=1) or push them away from the line (degree<=1).
29	5e96393c	Leszek Koltunski	*
30			* Note: this is not a fully 3D effect - the pinching is always within the XY plane; z coordinates
31			* of all vertices remain unaffected. If someone wants a fully 3D Pinch effect, we'd probably need
32			* to write another VertexEffectPinch3D with 2 more arguments (latitude and longitude angles defining
33			* the plane the pinching works on).
34	faa3ff56	Leszek Koltunski	*/
35	125cee3d	Leszek Koltunski	public class VertexEffectPinch extends VertexEffect
36			{
37	aee0b581	Leszek Koltunski	private Data3D mPinch;
38	0dd98279	Leszek Koltunski	private Data3D mCenter;
39			private Data4D mRegion;
40
41	125cee3d	Leszek Koltunski	///////////////////////////////////////////////////////////////////////////////////////////////////
42	6bb59aad	Leszek Koltunski	/**
43	faa3ff56	Leszek Koltunski	* Only for use by the library itself.
44	6bb59aad	Leszek Koltunski	*
45	faa3ff56	Leszek Koltunski	* @y.exclude
46	6bb59aad	Leszek Koltunski	*/
47	15aa7d94	Leszek Koltunski	public boolean compute(float[] uniforms, int index, long currentDuration, long step )
48			{
49	b24e4719	Leszek Koltunski	mCenter.get(uniforms,index+CENTER_OFFSET,currentDuration,step);
50			mRegion.get(uniforms,index+REGION_OFFSET,currentDuration,step);
51	0dd98279	Leszek Koltunski	boolean ret = mPinch.get(uniforms,index,currentDuration,step);
52	15aa7d94	Leszek Koltunski
53			uniforms[index+1] = (float)(Math.PI*uniforms[index+1]/180);
54	aee0b581	Leszek Koltunski	uniforms[index+2] = (float)(Math.PI*uniforms[index+2]/180);
55	15aa7d94	Leszek Koltunski
56			return ret;
57	125cee3d	Leszek Koltunski	}
58	7cd24173	leszek
59	faa3ff56	Leszek Koltunski	///////////////////////////////////////////////////////////////////////////////////////////////////
60			// PUBLIC API
61	7cd24173	leszek	///////////////////////////////////////////////////////////////////////////////////////////////////
62	aee0b581	Leszek Koltunski	// Pull P=(v.x,v.y) along a vector from the center of region sphere to a point on it defined by
63			// the (latitude,longitude) pair of angles with P' = P + (1-h)*dist(line to P)
64	7cd24173	leszek	// when h>1 we are pushing points away from S: P' = P + (1/h-1)*dist(line to P)
65	aee0b581	Leszek Koltunski	// (where 'line' above passes through the center point and goes along the vector)
66	faa3ff56	Leszek Koltunski	///////////////////////////////////////////////////////////////////////////////////////////////////
67			/**
68	7602a827	Leszek Koltunski	* Have to call this before the shaders get compiled (i.e before DistortedLibrary.onCreate()) for the Effect to work.
69	faa3ff56	Leszek Koltunski	*/
70	7cd24173	leszek	public static void enable()
71			{
72			addEffect(EffectName.PINCH,
73
74	0f10a0b6	Leszek Koltunski	"vec3 ps = vUniforms[effect+1].yzw -v; \n"
75	569ea22c	Leszek Koltunski	+ "float h = vUniforms[effect].x; \n"
76			+ "float latitude = vUniforms[effect].y; \n"
77			+ "float longitude = vUniforms[effect].z; \n"
78	0f10a0b6	Leszek Koltunski	+ "float deg = degree(vUniforms[effect+2],ps); \n"
79	aee0b581	Leszek Koltunski	+ "float t = deg * (1.0-h)/max(1.0,h); \n"
80			+ "float sinLAT = sin(latitude); \n"
81			+ "float cosLAT = cos(latitude); \n"
82			+ "float sinLON = sin(longitude); \n"
83			+ "float cosLON = cos(longitude); \n"
84			+ "vec3 dir = vec3(sinLONcosLAT,sinLAT,cosLONcosLAT);\n"
85	569ea22c	Leszek Koltunski	+ "float dot_dir_ps = dot(dir,ps); \n"
86			+ "v += tdot_dir_psdir; \n"
87
88			+ "const float A = 1.6; \n" // max amount of change in normal vector when pulling
89			+ "const float B = 10.0; \n" // when pushing
90			+ "vec3 n_ps = dot(ps,n)ps; \n" // n_ps = (component of n that's parallel to ps) \|ps\|^2 (=dot(ps,ps))
91			+ "float dot_ps = dot(ps,ps); \n"
92			+ "float sign_ps= sign(dot_ps); \n"
93			+ "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
94			+ "float move = deg(h-1.0)/(h/B+1.0/A); \n" // move(0)=-Adeg, move(1)=0, move(inf)=B*deg
95			+ "n += move * abs(dot(n,dir)) * n_ps; \n"
96			+ "n = normalize(n);"
97	7cd24173	leszek	);
98			}
99	faa3ff56	Leszek Koltunski
100			///////////////////////////////////////////////////////////////////////////////////////////////////
101			/**
102			* Pull all points around the center of the Effect towards a line passing through the center
103			* (that's if degree>=1) or push them away from the line (degree<=1)
104			*
105	aee0b581	Leszek Koltunski	* @param pinch The current degree of the Effect + (latitude,longitude) pair of angles defining the
106			* * point towards which (and its antipode) the pinching power is strongest.
107	faa3ff56	Leszek Koltunski	* @param center 3-dimensional Data that, at any given time, returns the Center of the Effect.
108			* @param region Region that masks the Effect.
109			*/
110	aee0b581	Leszek Koltunski	public VertexEffectPinch(Data3D pinch, Data3D center, Data4D region)
111	faa3ff56	Leszek Koltunski	{
112			super(EffectName.PINCH);
113			mPinch = pinch;
114			mCenter = center;
115	dd89c7f4	Leszek Koltunski	mRegion = (region==null ? MAX_REGION : region);
116	faa3ff56	Leszek Koltunski	}
117
118			///////////////////////////////////////////////////////////////////////////////////////////////////
119			/**
120			* Pull all points around the center of the Effect towards a line passing through the center
121			* (that's if degree>=1) or push them away from the line (degree<=1)
122			*
123	aee0b581	Leszek Koltunski	* @param pinch The current degree of the Effect + (latitude,longitude) pair of angles defining the
124			* point towards which (and its antipode) the pinching power is strongest.
125	faa3ff56	Leszek Koltunski	* @param center 3-dimensional Data that, at any given time, returns the Center of the Effect.
126			*/
127	aee0b581	Leszek Koltunski	public VertexEffectPinch(Data3D pinch, Data3D center)
128	faa3ff56	Leszek Koltunski	{
129			super(EffectName.PINCH);
130			mPinch = pinch;
131			mCenter = center;
132	dd89c7f4	Leszek Koltunski	mRegion = MAX_REGION;
133	faa3ff56	Leszek Koltunski	}
134	125cee3d	Leszek Koltunski	}

Project

General

Profile

Distorted Android

library / src / main / java / org / distorted / library / effect / VertexEffectPinch.java @ 0f10a0b6