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

library / src / main / java / org / distorted / library / mesh / MeshTriangle.java @ d23592bb

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	b17aa4aa	Leszek Koltunski	/**
25	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)
26	b17aa4aa	Leszek Koltunski	*/
27	b948df7a	Leszek Koltunski	public class MeshTriangle extends MeshBase
28	9099e567	Leszek Koltunski	{
29			private int numVertices;
30			private int remainingVert;
31
32			///////////////////////////////////////////////////////////////////////////////////////////////////
33
34	e54bfada	Leszek Koltunski	private int addVertex(int vertex, float x, float y, float[] attribs1, float[] attribs2)
35	9099e567	Leszek Koltunski	{
36			remainingVert--;
37
38	e54bfada	Leszek Koltunski	attribs1[VERT1_ATTRIBS*vertex + POS_ATTRIB ] = x-0.5f;
39			attribs1[VERT1_ATTRIBS*vertex + POS_ATTRIB+1] = y-0.5f;
40			attribs1[VERT1_ATTRIBS*vertex + POS_ATTRIB+2] = 0.0f;
41	9099e567	Leszek Koltunski
42	e54bfada	Leszek Koltunski	attribs1[VERT1_ATTRIBS*vertex + NOR_ATTRIB ] = 0.0f;
43			attribs1[VERT1_ATTRIBS*vertex + NOR_ATTRIB+1] = 0.0f;
44			attribs1[VERT1_ATTRIBS*vertex + NOR_ATTRIB+2] = 1.0f;
45	9099e567	Leszek Koltunski
46	e54bfada	Leszek Koltunski	attribs2[VERT2_ATTRIBS*vertex + TEX_ATTRIB ] = x;
47			attribs2[VERT2_ATTRIBS*vertex + TEX_ATTRIB+1] = y;
48	9099e567	Leszek Koltunski
49			return vertex+1;
50			}
51
52			///////////////////////////////////////////////////////////////////////////////////////////////////
53
54			private void computeNumberOfVertices(int level)
55			{
56			numVertices = level*(level+2);
57			remainingVert = numVertices;
58			}
59
60			///////////////////////////////////////////////////////////////////////////////////////////////////
61
62	e54bfada	Leszek Koltunski	private int buildRow(int vertex,float sx, float sy, int length, float dx, float dy, float[] attribs1, float[] attribs2)
63	9099e567	Leszek Koltunski	{
64			for(int i=0; i<length; i++)
65			{
66	e54bfada	Leszek Koltunski	vertex = addVertex(vertex, sx , sy , attribs1, attribs2);
67			vertex = addVertex(vertex, sx+dx, sy+dy, attribs1, attribs2);
68	9099e567	Leszek Koltunski	sx += 2*dx;
69			}
70
71	e54bfada	Leszek Koltunski	vertex = addVertex(vertex, sx, sy, attribs1, attribs2);
72	9099e567	Leszek Koltunski
73			return vertex;
74			}
75
76			///////////////////////////////////////////////////////////////////////////////////////////////////
77
78	e54bfada	Leszek Koltunski	private void buildGrid(float[] attribs1, float[] attribs2, int level)
79	9099e567	Leszek Koltunski	{
80			float sx = 0.0f;
81			float sy = 0.0f;
82			float dx = 0.5f/level;
83	b35570ad	Leszek Koltunski	float dy = 1.0f/level;
84	9099e567	Leszek Koltunski	int vertex = 0;
85
86			for(int row=level; row>=1; row--)
87			{
88	e54bfada	Leszek Koltunski	vertex = buildRow(vertex,sx,sy,row,dx,dy,attribs1,attribs2);
89	9099e567	Leszek Koltunski
90			sx += 2dx(row-0.5f);
91			sy += dy;
92			dx *= -1;
93			}
94			}
95
96			///////////////////////////////////////////////////////////////////////////////////////////////////
97			// PUBLIC API
98			///////////////////////////////////////////////////////////////////////////////////////////////////
99			/**
100	45b08c37	Leszek Koltunski	* Creates the underlying grid of vertices with the usual attribs which approximates a triangle
101			* with vertices at (-0.5,-0.5),(+0.5,-0.5),(0.0,0.5)
102	9099e567	Leszek Koltunski	*
103			* @param level Specifies the level of slicing. Valid values: level ≥ 1
104			*/
105	b948df7a	Leszek Koltunski	public MeshTriangle(int level)
106	9099e567	Leszek Koltunski	{
107	0f10a0b6	Leszek Koltunski	super();
108	9099e567	Leszek Koltunski
109			computeNumberOfVertices(level);
110
111	e54bfada	Leszek Koltunski	float[] attribs1= new float[VERT1_ATTRIBS*numVertices];
112			float[] attribs2= new float[VERT2_ATTRIBS*numVertices];
113
114			buildGrid(attribs1, attribs2, level);
115	9099e567	Leszek Koltunski
116			if( remainingVert!=0 )
117			android.util.Log.d("MeshTriangles", "remainingVert " +remainingVert );
118
119	e54bfada	Leszek Koltunski	setAttribs(attribs1, attribs2);
120	9099e567	Leszek Koltunski	}
121	cbd502ec	Leszek Koltunski
122			///////////////////////////////////////////////////////////////////////////////////////////////////
123			/**
124	4f81e0c8	Leszek Koltunski	* Copy constructor.
125	cbd502ec	Leszek Koltunski	*/
126	b948df7a	Leszek Koltunski	public MeshTriangle(MeshTriangle mesh, boolean deep)
127	cbd502ec	Leszek Koltunski	{
128	4f81e0c8	Leszek Koltunski	super(mesh,deep);
129	cbd502ec	Leszek Koltunski	}
130
131			///////////////////////////////////////////////////////////////////////////////////////////////////
132			/**
133	4f81e0c8	Leszek Koltunski	* Copy the Mesh.
134			*
135			* @param deep If to be a deep or shallow copy of mVertAttribs1, i.e. the array holding vertices,
136			* normals and inflates (the rest, in particular the mVertAttribs2 containing texture
137	aee078f8	Leszek Koltunski	* coordinates and effect associations, is always deep copied)
138	cbd502ec	Leszek Koltunski	*/
139	b948df7a	Leszek Koltunski	public MeshTriangle copy(boolean deep)
140	cbd502ec	Leszek Koltunski	{
141	b948df7a	Leszek Koltunski	return new MeshTriangle(this,deep);
142	cbd502ec	Leszek Koltunski	}
143	9099e567	Leszek Koltunski	}

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library / src / main / java / org / distorted / library / mesh / MeshTriangle.java @ d23592bb