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

library / src / main / java / org / distorted / library / effect / VertexEffectSwirl.java @ c0255951

1	125cee3d	Leszek Koltunski	///////////////////////////////////////////////////////////////////////////////////////////////////
2	cc62b34a	Leszek Koltunski	// Copyright 2017 Leszek Koltunski leszek@koltunski.pl //
3	125cee3d	Leszek Koltunski	// //
4	46b572b5	Leszek Koltunski	// This file is part of Distorted. //
5	125cee3d	Leszek Koltunski	// //
6	cc62b34a	Leszek Koltunski	// 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	125cee3d	Leszek Koltunski	// //
11	cc62b34a	Leszek Koltunski	// This library 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	cc62b34a	Leszek Koltunski	// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU //
14			// Lesser General Public License for more details. //
15	125cee3d	Leszek Koltunski	// //
16	cc62b34a	Leszek Koltunski	// 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	125cee3d	Leszek Koltunski	///////////////////////////////////////////////////////////////////////////////////////////////////
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	faa3ff56	Leszek Koltunski	/**
29			* 'Swirl' part of the Mesh, i.e rotate part of it around a point.
30	5e96393c	Leszek Koltunski	*
31			* Note: this is not a fully 3D effect as the swirling happens entirely within the XY plane - z
32			* coordinates of all vertices remain unaffected. If someone wants a fully 3D swirling, we'd
33			* probably need to write another VertixEffectSwirl3D with two additional parameters: latitude and
34			* longitude angles defining the plane swirling is working on.
35	faa3ff56	Leszek Koltunski	*/
36	125cee3d	Leszek Koltunski	public class VertexEffectSwirl extends VertexEffect
37			{
38	f046b159	Leszek Koltunski	private static final EffectName NAME = EffectName.SWIRL;
39
40	0e1d3d2e	Leszek Koltunski	private final Data1D mSwirl;
41			private final Data3D mCenter;
42			private final Data4D mRegion;
43	0dd98279	Leszek Koltunski
44	125cee3d	Leszek Koltunski	///////////////////////////////////////////////////////////////////////////////////////////////////
45	6bb59aad	Leszek Koltunski	/**
46	faa3ff56	Leszek Koltunski	* Only for use by the library itself.
47	6bb59aad	Leszek Koltunski	*
48	faa3ff56	Leszek Koltunski	* @y.exclude
49	6bb59aad	Leszek Koltunski	*/
50	15aa7d94	Leszek Koltunski	public boolean compute(float[] uniforms, int index, long currentDuration, long step )
51			{
52	b24e4719	Leszek Koltunski	mCenter.get(uniforms,index+CENTER_OFFSET,currentDuration,step);
53			mRegion.get(uniforms,index+REGION_OFFSET,currentDuration,step);
54	f046b159	Leszek Koltunski	boolean ret = mSwirl.get(uniforms,index+VALUES_OFFSET,currentDuration,step);
55	15aa7d94	Leszek Koltunski
56	f046b159	Leszek Koltunski	uniforms[index+VALUES_OFFSET] = (float)(Math.PI*uniforms[index]/180);
57	15aa7d94	Leszek Koltunski
58			return ret;
59	125cee3d	Leszek Koltunski	}
60	7cd24173	leszek
61			///////////////////////////////////////////////////////////////////////////////////////////////////
62			// Let d be the degree of the current vertex V with respect to center of the effect S and Region vRegion.
63			// This effect rotates the current vertex V by vInterpolated.x radians clockwise around the circle dilated
64			// by (1-d) around the center of the effect S.
65	faa3ff56	Leszek Koltunski	///////////////////////////////////////////////////////////////////////////////////////////////////
66	f046b159	Leszek Koltunski
67			static String code()
68	7cd24173	leszek	{
69	f046b159	Leszek Koltunski	return
70	7cd24173	leszek
71	353f7580	Leszek Koltunski	"vec3 center = vUniforms[effect+1].yzw; \n"
72			+ "vec3 PS = center-v.xyz; \n"
73			+ "vec4 SO = vUniforms[effect+2]; \n"
74	0f10a0b6	Leszek Koltunski	+ "float deg1 = degree(SO,PS); \n"
75	353f7580	Leszek Koltunski	+ "float alpha = vUniforms[effect].x; \n"
76			+ "float sinA = sin(alpha); \n"
77			+ "float cosA = cos(alpha); \n"
78	7cd24173	leszek
79	4aa38649	Leszek Koltunski	+ "vec3 PS2 = vec3( PS.xcosA+PS.ysinA,-PS.xsinA+PS.ycosA, PS.z ); \n" // vector PS rotated by A radians clockwise around center.
80	0f10a0b6	Leszek Koltunski	+ "vec4 SG = (1.0-deg1)*SO; \n" // coordinates of the dilated circle P is going to get rotated around
81			+ "float d2 = max(0.0,degree(SG,PS2)); \n" // make it a max(0,deg) because otherwise when center=left edge of the
82	353f7580	Leszek Koltunski	// object some points end up with d2<0 and they disappear off view.
83	f046b159	Leszek Koltunski	+ "v.xy += deg1 * (PS.xy - PS2.xy/(1.0-d2)); \n";// if d2=1 (i.e P=center) we should have P unchanged. How to do it?
84			}
85
86			///////////////////////////////////////////////////////////////////////////////////////////////////
87			// PUBLIC API
88			///////////////////////////////////////////////////////////////////////////////////////////////////
89			/**
90			* Have to call this before the shaders get compiled (i.e before DistortedLibrary.onCreate()) for the Effect to work.
91			*/
92			public static void enable()
93			{
94			addEffect( NAME, code() );
95	7cd24173	leszek	}
96	faa3ff56	Leszek Koltunski
97			///////////////////////////////////////////////////////////////////////////////////////////////////
98			/**
99			* Rotate part of the Mesh around the Center of the Effect by a certain angle.
100			*
101			* @param swirl The angle of Swirl (in degrees). Positive values swirl clockwise.
102			* @param center 3-dimensional Data that, at any given time, returns the Center of the Effect.
103			* @param region Region that masks the Effect.
104			*/
105			public VertexEffectSwirl(Data1D swirl, Data3D center, Data4D region)
106			{
107	f046b159	Leszek Koltunski	super(NAME);
108	faa3ff56	Leszek Koltunski	mSwirl = swirl;
109			mCenter = center;
110	dd89c7f4	Leszek Koltunski	mRegion = (region==null ? MAX_REGION : region);
111	faa3ff56	Leszek Koltunski	}
112
113			///////////////////////////////////////////////////////////////////////////////////////////////////
114			/**
115			* Rotate the whole Mesh around the Center of the Effect by a certain angle.
116			*
117			* @param swirl The angle of Swirl (in degrees). Positive values swirl clockwise.
118			* @param center 3-dimensional Data that, at any given time, returns the Center of the Effect.
119			*/
120			public VertexEffectSwirl(Data1D swirl, Data3D center)
121			{
122	f046b159	Leszek Koltunski	super(NAME);
123	faa3ff56	Leszek Koltunski	mSwirl = swirl;
124			mCenter = center;
125	dd89c7f4	Leszek Koltunski	mRegion = MAX_REGION;
126	faa3ff56	Leszek Koltunski	}
127	125cee3d	Leszek Koltunski	}

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library / src / main / java / org / distorted / library / effect / VertexEffectSwirl.java @ c0255951