ovh.tgrhavoc.gameengine.core.Mesh.java Source code

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Here is the source code for ovh.tgrhavoc.gameengine.core.Mesh.java

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/*******************************************************************************
 *     Copyright (C) 2015 Jordan Dalton
 *
 *     This program is free software; you can redistribute it and/or modify
 *     it under the terms of the GNU General Public License as published by
 *     the Free Software Foundation; either version 2 of the License, or
 *     (at your option) any later version.
 *
 *     This program is distributed in the hope that it will be useful,
 *     but WITHOUT ANY WARRANTY; without even the implied warranty of
 *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *     GNU General Public License for more details.
 *
 *     You should have received a copy of the GNU General Public License along
 *     with this program; if not, write to the Free Software Foundation, Inc.,
 *     51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 *******************************************************************************/
package ovh.tgrhavoc.gameengine.core;

import java.io.BufferedReader;
import java.io.FileReader;
import java.util.ArrayList;

import org.lwjgl.opengl.GL11;
import org.lwjgl.opengl.GL15;
import org.lwjgl.opengl.GL20;

public class Mesh {

    int vbo; //Vertex Buffer Obj
    int size;
    int ibo;

    public Mesh(String file) {
        initMesh();
        loadMesh(file);
    }

    public Mesh(Vertex[] verticies, int[] indecies) {
        this(verticies, indecies, false);
    }

    public Mesh(Vertex[] verticies, int[] indecies, boolean calcNorms) {
        initMesh();
        addVerticies(verticies, indecies, calcNorms);
    }

    private void initMesh() {
        vbo = GL15.glGenBuffers();
        ibo = GL15.glGenBuffers();
        size = 0;
    }

    private Mesh loadMesh(String filename) {
        String[] splitArray = filename.split("\\.");
        String ex = splitArray[splitArray.length - 1];

        if (!ex.equalsIgnoreCase("obj")) {
            System.err.println("Error: File extention '" + ex + "' is not supported for mesh data!");
            new Exception().printStackTrace();
            System.exit(-1);
        }

        ArrayList<Vertex> vertecies = new ArrayList<Vertex>();
        ArrayList<Integer> indecies = new ArrayList<Integer>();

        BufferedReader br = null;

        try {
            br = new BufferedReader(new FileReader("./res/models/" + filename));

            String line;
            Window.setTitle("Loading.. " + filename);

            while ((line = br.readLine()) != null) {
                //System.out.println("Loaing mesh...");
                String[] tokens = line.split(" ");
                tokens = Util.removeEmptyStrings(tokens);
                if (tokens.length == 0 || tokens[0].equalsIgnoreCase("#"))
                    continue;
                else if (tokens[0].equals("v")) {
                    vertecies.add(new Vertex(new Vector3f(Float.valueOf(tokens[1]), Float.valueOf(tokens[2]),
                            Float.valueOf(tokens[3]))));
                } else if (tokens[0].equals("f")) {
                    indecies.add(Integer.parseInt(tokens[1].split("/")[0]) - 1);
                    indecies.add(Integer.parseInt(tokens[2].split("/")[0]) - 1);
                    indecies.add(Integer.parseInt(tokens[3].split("/")[0]) - 1);

                    if (tokens.length > 4) {
                        indecies.add(Integer.parseInt(tokens[1].split("/")[0]) - 1);
                        indecies.add(Integer.parseInt(tokens[3].split("/")[0]) - 1);
                        indecies.add(Integer.parseInt(tokens[4].split("/")[0]) - 1);
                    }

                }
            }

            br.close();

            Vertex[] vertexData = new Vertex[vertecies.size()];
            vertecies.toArray(vertexData);

            Integer[] indeciesData = new Integer[indecies.size()];
            indecies.toArray(indeciesData);

            addVerticies(vertexData, Util.toIntArray(indeciesData), true);

            Window.setTitle("Viewing: " + filename.replace(".obj", ""));

        } catch (Exception e) {
            e.printStackTrace();
            System.exit(-1);
        }

        return null;
    }

    private void calcNorms(Vertex[] data, int[] data2) {
        for (int i = 0; i < data2.length; i += 3) {
            int i0 = data2[i];
            int i1 = data2[i + 1];
            int i2 = data2[i + 2];

            Vector3f v1 = data[i1].getPos().subtract(data[i0].getPos());
            Vector3f v2 = data[i2].getPos().subtract(data[i0].getPos());

            Vector3f normal = v1.cross(v2).normalized();

            data[i0].setNormal(data[i0].getNormal().add(normal));
            data[i1].setNormal(data[i1].getNormal().add(normal));
            data[i2].setNormal(data[i2].getNormal().add(normal));
        }
        for (int i = 0; i < data.length; i++)
            data[i].setNormal(data[i].getNormal().normalized());

    }

    private void addVerticies(Vertex[] verticies, int[] indecies, boolean calcNorms) {

        if (calcNorms) {
            this.calcNorms(verticies, indecies);
        }

        size = indecies.length;

        GL15.glBindBuffer(GL15.GL_ARRAY_BUFFER, vbo);
        GL15.glBufferData(GL15.GL_ARRAY_BUFFER, Util.createFlippedBuffer(verticies), GL15.GL_STATIC_DRAW);

        GL15.glBindBuffer(GL15.GL_ELEMENT_ARRAY_BUFFER, ibo);
        GL15.glBufferData(GL15.GL_ELEMENT_ARRAY_BUFFER, Util.createFlippedBuffer(indecies), GL15.GL_STATIC_DRAW);

    }

    public void draw() {
        GL20.glEnableVertexAttribArray(0);
        GL20.glEnableVertexAttribArray(1);
        GL20.glEnableVertexAttribArray(2);

        GL15.glBindBuffer(GL15.GL_ARRAY_BUFFER, vbo);

        GL20.glVertexAttribPointer(0, 3, GL11.GL_FLOAT, false, Vertex.SIZE * 4, 0);

        GL20.glVertexAttribPointer(1, 2, GL11.GL_FLOAT, false, Vertex.SIZE * 4, 12);

        GL20.glVertexAttribPointer(2, 3, GL11.GL_FLOAT, false, Vertex.SIZE * 4, 20);

        GL15.glBindBuffer(GL15.GL_ELEMENT_ARRAY_BUFFER, ibo);

        GL11.glDrawElements(GL11.GL_TRIANGLES, size, GL11.GL_UNSIGNED_INT, 0);

        GL20.glDisableVertexAttribArray(0);
        GL20.glDisableVertexAttribArray(1);
        GL20.glDisableVertexAttribArray(2);
    }

}