/src/main/java/org/distorted/library/mesh/MeshTriangle.java - Annotate - Distorted Android

library / src / main / java / org / distorted / library / mesh / MeshTriangle.java @ d1fa4e16

1	9099e567	Leszek Koltunski	///////////////////////////////////////////////////////////////////////////////////////////////////
2	c4d06f90	Leszek Koltunski	// Copyright 2020 Leszek Koltunski leszek@koltunski.pl //
3	9099e567	Leszek Koltunski	// //
4			// This file is part of Distorted. //
5			// //
6	c4d06f90	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	9099e567	Leszek Koltunski	// //
11	c4d06f90	Leszek Koltunski	// This library is distributed in the hope that it will be useful, //
12	9099e567	Leszek Koltunski	// but WITHOUT ANY WARRANTY; without even the implied warranty of //
13	c4d06f90	Leszek Koltunski	// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU //
14			// Lesser General Public License for more details. //
15	9099e567	Leszek Koltunski	// //
16	c4d06f90	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	9099e567	Leszek Koltunski	///////////////////////////////////////////////////////////////////////////////////////////////////
20
21			package org.distorted.library.mesh;
22
23			///////////////////////////////////////////////////////////////////////////////////////////////////
24	8c57d77b	Leszek Koltunski
25			import org.distorted.library.main.DistortedLibrary;
26
27	b17aa4aa	Leszek Koltunski	/**
28	45b08c37	Leszek Koltunski	* Create a Mesh which approximates a triangle with vertices at (-0.5,-0.5),(+0.5,-0.5),(0.0,0.5)
29	b17aa4aa	Leszek Koltunski	*/
30	b948df7a	Leszek Koltunski	public class MeshTriangle extends MeshBase
31	9099e567	Leszek Koltunski	{
32			private int numVertices;
33			private int remainingVert;
34
35			///////////////////////////////////////////////////////////////////////////////////////////////////
36
37	e54bfada	Leszek Koltunski	private int addVertex(int vertex, float x, float y, float[] attribs1, float[] attribs2)
38	9099e567	Leszek Koltunski	{
39			remainingVert--;
40
41	e54bfada	Leszek Koltunski	attribs1[VERT1_ATTRIBS*vertex + POS_ATTRIB ] = x-0.5f;
42			attribs1[VERT1_ATTRIBS*vertex + POS_ATTRIB+1] = y-0.5f;
43			attribs1[VERT1_ATTRIBS*vertex + POS_ATTRIB+2] = 0.0f;
44	9099e567	Leszek Koltunski
45	e54bfada	Leszek Koltunski	attribs1[VERT1_ATTRIBS*vertex + NOR_ATTRIB ] = 0.0f;
46			attribs1[VERT1_ATTRIBS*vertex + NOR_ATTRIB+1] = 0.0f;
47			attribs1[VERT1_ATTRIBS*vertex + NOR_ATTRIB+2] = 1.0f;
48	9099e567	Leszek Koltunski
49	e54bfada	Leszek Koltunski	attribs2[VERT2_ATTRIBS*vertex + TEX_ATTRIB ] = x;
50			attribs2[VERT2_ATTRIBS*vertex + TEX_ATTRIB+1] = y;
51	9099e567	Leszek Koltunski
52			return vertex+1;
53			}
54
55			///////////////////////////////////////////////////////////////////////////////////////////////////
56
57			private void computeNumberOfVertices(int level)
58			{
59			numVertices = level*(level+2);
60			remainingVert = numVertices;
61			}
62
63			///////////////////////////////////////////////////////////////////////////////////////////////////
64
65	e54bfada	Leszek Koltunski	private int buildRow(int vertex,float sx, float sy, int length, float dx, float dy, float[] attribs1, float[] attribs2)
66	9099e567	Leszek Koltunski	{
67			for(int i=0; i<length; i++)
68			{
69	e54bfada	Leszek Koltunski	vertex = addVertex(vertex, sx , sy , attribs1, attribs2);
70			vertex = addVertex(vertex, sx+dx, sy+dy, attribs1, attribs2);
71	9099e567	Leszek Koltunski	sx += 2*dx;
72			}
73
74	e54bfada	Leszek Koltunski	vertex = addVertex(vertex, sx, sy, attribs1, attribs2);
75	9099e567	Leszek Koltunski
76			return vertex;
77			}
78
79			///////////////////////////////////////////////////////////////////////////////////////////////////
80
81	e54bfada	Leszek Koltunski	private void buildGrid(float[] attribs1, float[] attribs2, int level)
82	9099e567	Leszek Koltunski	{
83			float sx = 0.0f;
84			float sy = 0.0f;
85			float dx = 0.5f/level;
86	b35570ad	Leszek Koltunski	float dy = 1.0f/level;
87	9099e567	Leszek Koltunski	int vertex = 0;
88
89			for(int row=level; row>=1; row--)
90			{
91	e54bfada	Leszek Koltunski	vertex = buildRow(vertex,sx,sy,row,dx,dy,attribs1,attribs2);
92	9099e567	Leszek Koltunski
93			sx += 2dx(row-0.5f);
94			sy += dy;
95			dx *= -1;
96			}
97			}
98
99			///////////////////////////////////////////////////////////////////////////////////////////////////
100			// PUBLIC API
101			///////////////////////////////////////////////////////////////////////////////////////////////////
102			/**
103	45b08c37	Leszek Koltunski	* Creates the underlying grid of vertices with the usual attribs which approximates a triangle
104			* with vertices at (-0.5,-0.5),(+0.5,-0.5),(0.0,0.5)
105	9099e567	Leszek Koltunski	*
106			* @param level Specifies the level of slicing. Valid values: level ≥ 1
107			*/
108	b948df7a	Leszek Koltunski	public MeshTriangle(int level)
109	9099e567	Leszek Koltunski	{
110	0f10a0b6	Leszek Koltunski	super();
111	9099e567	Leszek Koltunski
112			computeNumberOfVertices(level);
113
114	e54bfada	Leszek Koltunski	float[] attribs1= new float[VERT1_ATTRIBS*numVertices];
115			float[] attribs2= new float[VERT2_ATTRIBS*numVertices];
116
117			buildGrid(attribs1, attribs2, level);
118	9099e567	Leszek Koltunski
119			if( remainingVert!=0 )
120	8c57d77b	Leszek Koltunski	DistortedLibrary.logMessage("MeshTriangle: remainingVert " +remainingVert );
121	9099e567	Leszek Koltunski
122	e54bfada	Leszek Koltunski	setAttribs(attribs1, attribs2);
123	9099e567	Leszek Koltunski	}
124	cbd502ec	Leszek Koltunski
125			///////////////////////////////////////////////////////////////////////////////////////////////////
126			/**
127	4f81e0c8	Leszek Koltunski	* Copy constructor.
128	cbd502ec	Leszek Koltunski	*/
129	b948df7a	Leszek Koltunski	public MeshTriangle(MeshTriangle mesh, boolean deep)
130	cbd502ec	Leszek Koltunski	{
131	4f81e0c8	Leszek Koltunski	super(mesh,deep);
132	cbd502ec	Leszek Koltunski	}
133
134			///////////////////////////////////////////////////////////////////////////////////////////////////
135			/**
136	4f81e0c8	Leszek Koltunski	* Copy the Mesh.
137			*
138			* @param deep If to be a deep or shallow copy of mVertAttribs1, i.e. the array holding vertices,
139			* normals and inflates (the rest, in particular the mVertAttribs2 containing texture
140	aee078f8	Leszek Koltunski	* coordinates and effect associations, is always deep copied)
141	cbd502ec	Leszek Koltunski	*/
142	b948df7a	Leszek Koltunski	public MeshTriangle copy(boolean deep)
143	cbd502ec	Leszek Koltunski	{
144	b948df7a	Leszek Koltunski	return new MeshTriangle(this,deep);
145	cbd502ec	Leszek Koltunski	}
146	9099e567	Leszek Koltunski	}

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library / src / main / java / org / distorted / library / mesh / MeshTriangle.java @ d1fa4e16