com.auroraengine.opengl.model.GLVertexBuffers.java Source code

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Here is the source code for com.auroraengine.opengl.model.GLVertexBuffers.java

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/*
 * Copyright (C) 2017 LittleRover
 *
 * 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.auroraengine.opengl.model;

import com.auroraengine.client.ClientException;
import com.auroraengine.debug.AuroraLogs;
import com.auroraengine.opengl.GLException;
import com.auroraengine.opengl.GLObject;
import java.nio.ByteBuffer;
import java.util.LinkedList;
import java.util.List;
import java.util.function.Supplier;
import java.util.logging.Logger;
import java.util.stream.Stream;
import org.lwjgl.BufferUtils;
import org.lwjgl.opengl.GL15;

/**
 *
 * @author LittleRover
 */
public class GLVertexBuffers implements GLObject {
    private static final Logger LOG = AuroraLogs.getLogger(GLVertexBuffers.class.getName());

    public GLVertexBuffers(Supplier<Vertex> p_supplier) {
        this.vertex_supplier = p_supplier;
    }

    private ByteBuffer dynamic_bb;
    private int dynamic_index = 0;
    private VertexFormat format;
    private ByteBuffer static_bb;
    private int static_index = 0;
    private ByteBuffer stream_bb;
    private int stream_index = 0;
    private boolean update_dynamic;
    private boolean update_static;
    private final Supplier<Vertex> vertex_supplier;
    private final List<Vertex> vertexes = new LinkedList<>();

    private void updateDynamic() {
        if (dynamic_bb != null) {
            format.putDynamicData(vertexes.stream(), dynamic_bb);
            dynamic_bb.flip();
            update_dynamic = false;
        }
    }

    private void updateStatic() {
        if (static_bb != null) {
            format.putStaticData(vertexes.stream(), static_bb);
            static_bb.flip();
            update_static = false;
        }
    }

    private void updateStream() {
        if (stream_bb != null) {
            format.putStreamData(vertexes.stream(), stream_bb);
            stream_bb.flip();
        }
    }

    @Override
    public void create() throws GLException {
        if (dynamic_bb != null && dynamic_index == 0) {
            dynamic_index = GL15.glGenBuffers();
            if (dynamic_index == 0) {
                throw new GLException("Buffer could not be generated.");
            }
            GL15.glBindBuffer(GL15.GL_ARRAY_BUFFER, dynamic_index);
            GL15.glBufferData(GL15.GL_ARRAY_BUFFER, dynamic_bb, GL15.GL_DYNAMIC_DRAW);
        }
        if (stream_bb != null && stream_index == 0) {
            stream_index = GL15.glGenBuffers();
            if (stream_index == 0) {
                throw new GLException("Buffer could not be generated.");
            }
            GL15.glBindBuffer(GL15.GL_ARRAY_BUFFER, stream_index);
            GL15.glBufferData(GL15.GL_ARRAY_BUFFER, stream_bb, GL15.GL_STREAM_DRAW);
        }
        if (static_bb != null && static_index == 0) {
            static_index = GL15.glGenBuffers();
            if (static_index == 0) {
                throw new GLException("Buffer could not be generated.");
            }
            GL15.glBindBuffer(GL15.GL_ARRAY_BUFFER, static_index);
            GL15.glBufferData(GL15.GL_ARRAY_BUFFER, static_bb, GL15.GL_STATIC_DRAW);
        }
    }

    @Override
    public void destroy() {
        if (static_index != 0) {
            GL15.glDeleteBuffers(static_index);
        }
        if (stream_index != 0) {
            GL15.glDeleteBuffers(stream_index);
        }
        if (dynamic_index != 0) {
            GL15.glDeleteBuffers(dynamic_index);
        }
    }

    @Override
    public boolean isCreated() {
        return static_index != 0 || dynamic_index != 0 || stream_index != 0;
    }

    @Override
    public boolean isLoaded() {
        return stream_bb != null || dynamic_bb != null || static_bb != null;
    }

    @Override
    public void load() throws ClientException {
        if (!isLoaded()) {
            Stream.generate(vertex_supplier).peek((v) -> {
                if (v != null) {
                    vertexes.add(v);
                }
            }).anyMatch((v) -> v == null);
            if (format.getVertexDynamicSize() > 0) {
                dynamic_bb = BufferUtils.createByteBuffer(format.getVertexDynamicSize() * vertexes.size());
            }
            if (format.getVertexStaticSize() > 0) {
                static_bb = BufferUtils.createByteBuffer(format.getVertexStaticSize() * vertexes.size());
            }
            if (format.getVertexStreamSize() > 0) {
                stream_bb = BufferUtils.createByteBuffer(format.getVertexStreamSize() * vertexes.size());
            }
            if (!isLoaded()) {
                throw new ClientException("Provided VertexFormat does not contain any information!");
            }
        }
    }

    public void markDynamicUpdate() {
        this.update_dynamic = true;
    }

    public void markStaticUpdate() {
        this.update_static = true;
    }

    @Override
    public void unload() throws ClientException {
        dynamic_bb = null;
        stream_bb = null;
        static_bb = null;
        vertexes.clear();
    }

    @Override
    public void update() throws GLException {
        if (update_dynamic) {
            updateDynamic();
        }
        if (update_static) {
            updateStatic();
        }
        updateStream();
    }

}