com.watabou.glwrap.Vertexbuffer.java Source code

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Here is the source code for com.watabou.glwrap.Vertexbuffer.java

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/*
 * Pixel Dungeon
 * Copyright (C) 2012-2015  Oleg Dolya
 *
 * Shattered Pixel Dungeon
 * Copyright (C) 2014-2016 Evan Debenham
 *
 * 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 3 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, see <http://www.gnu.org/licenses/>
 */

package com.watabou.glwrap;

import com.badlogic.gdx.Gdx;
import com.badlogic.gdx.graphics.GL20;

import java.nio.FloatBuffer;
import java.util.ArrayList;

public class Vertexbuffer {

    private int id;
    private FloatBuffer vertices;
    private int updateStart, updateEnd;

    private static ArrayList<Vertexbuffer> buffers = new ArrayList<>();

    public Vertexbuffer(FloatBuffer vertices) {
        id = Gdx.gl.glGenBuffer();

        this.vertices = vertices;
        buffers.add(this);

        updateStart = 0;
        updateEnd = vertices.limit();
    }

    //For flagging the buffer for a full update without changing anything
    public void updateVertices() {
        updateVertices(vertices);
    }

    //For flagging an update with a full set of new data
    public void updateVertices(FloatBuffer vertices) {
        updateVertices(vertices, 0, vertices.limit());
    }

    //For flagging an update with a subset of data changed
    public void updateVertices(FloatBuffer vertices, int start, int end) {
        this.vertices = vertices;

        if (updateStart == -1)
            updateStart = start;
        else
            updateStart = Math.min(start, updateStart);

        if (updateEnd == -1)
            updateEnd = end;
        else
            updateEnd = Math.max(end, updateEnd);
    }

    public void updateGLData() {
        if (updateStart == -1)
            return;

        vertices.position(updateStart);
        bind();

        if (updateStart == 0 && updateEnd == vertices.limit()) {
            Gdx.gl.glBufferData(GL20.GL_ARRAY_BUFFER, vertices.limit() * 4, vertices, GL20.GL_DYNAMIC_DRAW);
        } else {
            Gdx.gl.glBufferSubData(GL20.GL_ARRAY_BUFFER, updateStart * 4, (updateEnd - updateStart) * 4, vertices);
        }

        release();
        updateStart = updateEnd = -1;
    }

    public void bind() {
        Gdx.gl.glBindBuffer(GL20.GL_ARRAY_BUFFER, id);
    }

    public void release() {
        Gdx.gl.glBindBuffer(GL20.GL_ARRAY_BUFFER, 0);
    }

    public void delete() {
        Gdx.gl.glDeleteBuffer(id);
        buffers.remove(this);
    }

    public static void refreshAllBuffers() {
        for (Vertexbuffer buf : buffers) {
            buf.updateVertices();
            buf.updateGLData();
        }
    }

}