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

library / src / main / java / org / distorted / library / mesh / MeshTriangle.java @ 97b6c85e

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	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)
25	b17aa4aa	Leszek Koltunski	*/
26	b948df7a	Leszek Koltunski	public class MeshTriangle extends MeshBase
27	9099e567	Leszek Koltunski	{
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	attribs2[VERT2_ATTRIBS*vertex + TEX_ATTRIB ] = x;
46			attribs2[VERT2_ATTRIBS*vertex + TEX_ATTRIB+1] = y;
47	9099e567	Leszek Koltunski
48			return vertex+1;
49			}
50
51			///////////////////////////////////////////////////////////////////////////////////////////////////
52
53			private void computeNumberOfVertices(int level)
54			{
55			numVertices = level*(level+2);
56			remainingVert = numVertices;
57			}
58
59			///////////////////////////////////////////////////////////////////////////////////////////////////
60
61	e54bfada	Leszek Koltunski	private int buildRow(int vertex,float sx, float sy, int length, float dx, float dy, float[] attribs1, float[] attribs2)
62	9099e567	Leszek Koltunski	{
63			for(int i=0; i<length; i++)
64			{
65	e54bfada	Leszek Koltunski	vertex = addVertex(vertex, sx , sy , attribs1, attribs2);
66			vertex = addVertex(vertex, sx+dx, sy+dy, attribs1, attribs2);
67	9099e567	Leszek Koltunski	sx += 2*dx;
68			}
69
70	e54bfada	Leszek Koltunski	vertex = addVertex(vertex, sx, sy, attribs1, attribs2);
71	9099e567	Leszek Koltunski
72			return vertex;
73			}
74
75			///////////////////////////////////////////////////////////////////////////////////////////////////
76
77	e54bfada	Leszek Koltunski	private void buildGrid(float[] attribs1, float[] attribs2, int level)
78	9099e567	Leszek Koltunski	{
79			float sx = 0.0f;
80			float sy = 0.0f;
81			float dx = 0.5f/level;
82	b35570ad	Leszek Koltunski	float dy = 1.0f/level;
83	9099e567	Leszek Koltunski	int vertex = 0;
84
85			for(int row=level; row>=1; row--)
86			{
87	e54bfada	Leszek Koltunski	vertex = buildRow(vertex,sx,sy,row,dx,dy,attribs1,attribs2);
88	9099e567	Leszek Koltunski
89			sx += 2dx(row-0.5f);
90			sy += dy;
91			dx *= -1;
92			}
93			}
94
95			///////////////////////////////////////////////////////////////////////////////////////////////////
96			// PUBLIC API
97			///////////////////////////////////////////////////////////////////////////////////////////////////
98			/**
99	45b08c37	Leszek Koltunski	* Creates the underlying grid of vertices with the usual attribs which approximates a triangle
100			* with vertices at (-0.5,-0.5),(+0.5,-0.5),(0.0,0.5)
101	9099e567	Leszek Koltunski	*
102			* @param level Specifies the level of slicing. Valid values: level ≥ 1
103			*/
104	b948df7a	Leszek Koltunski	public MeshTriangle(int level)
105	9099e567	Leszek Koltunski	{
106	0f10a0b6	Leszek Koltunski	super();
107	9099e567	Leszek Koltunski
108			computeNumberOfVertices(level);
109
110	e54bfada	Leszek Koltunski	float[] attribs1= new float[VERT1_ATTRIBS*numVertices];
111			float[] attribs2= new float[VERT2_ATTRIBS*numVertices];
112
113			buildGrid(attribs1, attribs2, level);
114	9099e567	Leszek Koltunski
115			if( remainingVert!=0 )
116			android.util.Log.d("MeshTriangles", "remainingVert " +remainingVert );
117
118	e54bfada	Leszek Koltunski	setAttribs(attribs1, attribs2);
119	9099e567	Leszek Koltunski	}
120	cbd502ec	Leszek Koltunski
121			///////////////////////////////////////////////////////////////////////////////////////////////////
122			/**
123	4f81e0c8	Leszek Koltunski	* Copy constructor.
124	cbd502ec	Leszek Koltunski	*/
125	b948df7a	Leszek Koltunski	public MeshTriangle(MeshTriangle mesh, boolean deep)
126	cbd502ec	Leszek Koltunski	{
127	4f81e0c8	Leszek Koltunski	super(mesh,deep);
128	cbd502ec	Leszek Koltunski	}
129
130			///////////////////////////////////////////////////////////////////////////////////////////////////
131			/**
132	4f81e0c8	Leszek Koltunski	* Copy the Mesh.
133			*
134			* @param deep If to be a deep or shallow copy of mVertAttribs1, i.e. the array holding vertices,
135			* normals and inflates (the rest, in particular the mVertAttribs2 containing texture
136	aee078f8	Leszek Koltunski	* coordinates and effect associations, is always deep copied)
137	cbd502ec	Leszek Koltunski	*/
138	b948df7a	Leszek Koltunski	public MeshTriangle copy(boolean deep)
139	cbd502ec	Leszek Koltunski	{
140	b948df7a	Leszek Koltunski	return new MeshTriangle(this,deep);
141	cbd502ec	Leszek Koltunski	}
142	9099e567	Leszek Koltunski	}

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library / src / main / java / org / distorted / library / mesh / MeshTriangle.java @ 97b6c85e