ru.axialshift.vram.gl.IndicesVBO.java Source code

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Here is the source code for ru.axialshift.vram.gl.IndicesVBO.java

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/*
 * Copyright 2014 Semion Nadezhdin
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *     http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package ru.axialshift.vram.gl;

import java.nio.ByteBuffer;

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

import ru.axialshift.resources.MeshData;

/*
 * Usually to be used as VAOIncapsulator data source
 */
public class IndicesVBO extends VBO {

    int indicesCount;

    public IndicesVBO(MeshData data) {
        this.data = data;
        this.indicesCount = this.data.getIndices().length;
        generateData();
    }

    private void generateData() {
        byte[] indices = data.getIndices();
        tovram = BufferUtils.createByteBuffer(indices.length);
        ((ByteBuffer) tovram).put(indices);
        tovram.flip();
    }

    @Override
    protected void upload_gl() {
        glpointer = GL15.glGenBuffers();
        GL15.glBindBuffer(GL15.GL_ELEMENT_ARRAY_BUFFER, glpointer);
        GL15.glBufferData(GL15.GL_ELEMENT_ARRAY_BUFFER, (ByteBuffer) tovram, GL15.GL_STATIC_DRAW);
        GL15.glBindBuffer(GL15.GL_ELEMENT_ARRAY_BUFFER, 0);
    }

    @Override
    protected void unload_gl() {
        GL15.glBindBuffer(GL15.GL_ELEMENT_ARRAY_BUFFER, 0);
        super.unload_gl();
    }

    public void draw() {
        GL15.glBindBuffer(GL15.GL_ELEMENT_ARRAY_BUFFER, glpointer);
        GL11.glDrawElements(GL11.GL_TRIANGLES, indicesCount, GL11.GL_UNSIGNED_BYTE, 0);
        GL15.glBindBuffer(GL15.GL_ELEMENT_ARRAY_BUFFER, 0);
    }

}