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

library / src / main / java / org / distorted / library / mesh / MeshTriangles.java @ 4f81e0c8

1	9099e567	Leszek Koltunski	///////////////////////////////////////////////////////////////////////////////////////////////////
2			// Copyright 2020 Leszek Koltunski //
3			// //
4			// This file is part of Distorted. //
5			// //
6			// Distorted is free software: you can redistribute it and/or modify //
7			// 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			// Distorted 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 //
14			// GNU General Public License for more details. //
15			// //
16			// You should have received a copy of the GNU General Public License //
17			// along with Distorted. If not, see <http://www.gnu.org/licenses/>. //
18			///////////////////////////////////////////////////////////////////////////////////////////////////
19
20			package org.distorted.library.mesh;
21
22			///////////////////////////////////////////////////////////////////////////////////////////////////
23	b17aa4aa	Leszek Koltunski	/**
24			* Create a Mesh which approximates an equilateral triangle.
25			*/
26	9099e567	Leszek Koltunski	public class MeshTriangles extends MeshBase
27			{
28			private int numVertices;
29			private int remainingVert;
30
31			///////////////////////////////////////////////////////////////////////////////////////////////////
32
33	e54bfada	Leszek Koltunski	private int addVertex(int vertex, float x, float y, float[] attribs1, float[] attribs2)
34	9099e567	Leszek Koltunski	{
35			remainingVert--;
36
37	e54bfada	Leszek Koltunski	attribs1[VERT1_ATTRIBS*vertex + POS_ATTRIB ] = x-0.5f;
38			attribs1[VERT1_ATTRIBS*vertex + POS_ATTRIB+1] = y-0.5f;
39			attribs1[VERT1_ATTRIBS*vertex + POS_ATTRIB+2] = 0.0f;
40	9099e567	Leszek Koltunski
41	e54bfada	Leszek Koltunski	attribs1[VERT1_ATTRIBS*vertex + NOR_ATTRIB ] = 0.0f;
42			attribs1[VERT1_ATTRIBS*vertex + NOR_ATTRIB+1] = 0.0f;
43			attribs1[VERT1_ATTRIBS*vertex + NOR_ATTRIB+2] = 1.0f;
44	9099e567	Leszek Koltunski
45	e54bfada	Leszek Koltunski	attribs1[VERT1_ATTRIBS*vertex + INF_ATTRIB ] = (x-0.5f);
46			attribs1[VERT1_ATTRIBS*vertex + INF_ATTRIB+1] = (y-0.5f);
47			attribs1[VERT1_ATTRIBS*vertex + INF_ATTRIB+2] = 0.01f ; // Inflated surface needs to be slightly in front
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	1e672c1d	Leszek Koltunski	attribs2[VERT2_ATTRIBS*vertex + ASS_ATTRIB ] = DEFAULT_ASSOCIATION;
52	9099e567	Leszek Koltunski
53			return vertex+1;
54			}
55
56			///////////////////////////////////////////////////////////////////////////////////////////////////
57
58			private void computeNumberOfVertices(int level)
59			{
60			numVertices = level*(level+2);
61			remainingVert = numVertices;
62			}
63
64			///////////////////////////////////////////////////////////////////////////////////////////////////
65
66	e54bfada	Leszek Koltunski	private int buildRow(int vertex,float sx, float sy, int length, float dx, float dy, float[] attribs1, float[] attribs2)
67	9099e567	Leszek Koltunski	{
68			for(int i=0; i<length; i++)
69			{
70	e54bfada	Leszek Koltunski	vertex = addVertex(vertex, sx , sy , attribs1, attribs2);
71			vertex = addVertex(vertex, sx+dx, sy+dy, attribs1, attribs2);
72	9099e567	Leszek Koltunski	sx += 2*dx;
73			}
74
75	e54bfada	Leszek Koltunski	vertex = addVertex(vertex, sx, sy, attribs1, attribs2);
76	9099e567	Leszek Koltunski
77			return vertex;
78			}
79
80			///////////////////////////////////////////////////////////////////////////////////////////////////
81
82	e54bfada	Leszek Koltunski	private void buildGrid(float[] attribs1, float[] attribs2, int level)
83	9099e567	Leszek Koltunski	{
84			float sx = 0.0f;
85			float sy = 0.0f;
86			float dx = 0.5f/level;
87	b35570ad	Leszek Koltunski	float dy = 1.0f/level;
88	9099e567	Leszek Koltunski	int vertex = 0;
89
90			for(int row=level; row>=1; row--)
91			{
92	e54bfada	Leszek Koltunski	vertex = buildRow(vertex,sx,sy,row,dx,dy,attribs1,attribs2);
93	9099e567	Leszek Koltunski
94			sx += 2dx(row-0.5f);
95			sy += dy;
96			dx *= -1;
97			}
98			}
99
100			///////////////////////////////////////////////////////////////////////////////////////////////////
101			// PUBLIC API
102			///////////////////////////////////////////////////////////////////////////////////////////////////
103			/**
104			* Creates the underlying grid of vertices with the usual attribs which approximates an equilateral
105			* triangle.
106			*
107			* @param level Specifies the level of slicing. Valid values: level ≥ 1
108			*/
109			public MeshTriangles(int level)
110			{
111	0f10a0b6	Leszek Koltunski	super();
112	9099e567	Leszek Koltunski
113			computeNumberOfVertices(level);
114
115	e54bfada	Leszek Koltunski	float[] attribs1= new float[VERT1_ATTRIBS*numVertices];
116			float[] attribs2= new float[VERT2_ATTRIBS*numVertices];
117
118			buildGrid(attribs1, attribs2, level);
119	9099e567	Leszek Koltunski
120			if( remainingVert!=0 )
121			android.util.Log.d("MeshTriangles", "remainingVert " +remainingVert );
122
123	e54bfada	Leszek Koltunski	setAttribs(attribs1, attribs2);
124	9099e567	Leszek Koltunski	}
125	cbd502ec	Leszek Koltunski
126			///////////////////////////////////////////////////////////////////////////////////////////////////
127			/**
128	4f81e0c8	Leszek Koltunski	* Copy constructor.
129	cbd502ec	Leszek Koltunski	*/
130	4f81e0c8	Leszek Koltunski	public MeshTriangles(MeshTriangles mesh, boolean deep)
131	cbd502ec	Leszek Koltunski	{
132	4f81e0c8	Leszek Koltunski	super(mesh,deep);
133	cbd502ec	Leszek Koltunski	}
134
135			///////////////////////////////////////////////////////////////////////////////////////////////////
136			/**
137	4f81e0c8	Leszek Koltunski	* Copy the Mesh.
138			*
139			* @param deep If to be a deep or shallow copy of mVertAttribs1, i.e. the array holding vertices,
140			* normals and inflates (the rest, in particular the mVertAttribs2 containing texture
141			* coordinates and effect assocciations, is always deep copied)
142	cbd502ec	Leszek Koltunski	*/
143	4f81e0c8	Leszek Koltunski	public MeshTriangles copy(boolean deep)
144	cbd502ec	Leszek Koltunski	{
145	4f81e0c8	Leszek Koltunski	return new MeshTriangles(this,deep);
146	cbd502ec	Leszek Koltunski	}
147	9099e567	Leszek Koltunski	}

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library / src / main / java / org / distorted / library / mesh / MeshTriangles.java @ 4f81e0c8