name.martingeisse.stackd.client.system.OpenGlVertexBuffer.java Source code

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Here is the source code for name.martingeisse.stackd.client.system.OpenGlVertexBuffer.java

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/**
 * Copyright (c) 2010 Martin Geisse
 *
 * This file is distributed under the terms of the MIT license.
 */

package name.martingeisse.stackd.client.system;

import static org.lwjgl.opengl.GL15.GL_ARRAY_BUFFER;
import static org.lwjgl.opengl.GL15.glBindBuffer;
import static org.lwjgl.opengl.GL15.glBufferData;
import java.nio.ByteBuffer;
import java.nio.DoubleBuffer;
import java.nio.FloatBuffer;
import java.nio.IntBuffer;
import java.nio.ShortBuffer;
import org.lwjgl.opengl.GL15;

/**
 * Represents OpenGL-server-side VBOs.
 */
public class OpenGlVertexBuffer extends OpenGlBuffer {

    /**
     * the size
     */
    private long size;

    /**
     * Binds this buffer to the GL_ARRAY_BUFFER target.
     */
    public final void bind() {
        glBindBuffer(GL_ARRAY_BUFFER, getName());
    }

    /**
     * Creates a new OpenGL-server-side data store for this buffer with uninitialized contents.
     * This also binds this buffer to GL_ARRAY_BUFFER implicitly.
     * @param size the size of the data store in bytes
     * @param usage the usage mode (see glBufferData() documentation for details)
     */
    public final void createDataStore(long size, int usage) {
        bind();
        glBufferData(GL_ARRAY_BUFFER, size, usage);
        this.size = size;
    }

    /**
     * Creates a new OpenGL-server-side data store for this buffer and uploads data from
     * the specified NIO buffer into the new data store.
     * This also binds this buffer to GL_ARRAY_BUFFER implicitly.
     * @param sourceBuffer the NIO buffer to read data from
     * @param usage the usage mode (see glBufferData() documentation for details)
     */
    public final void createDataStore(ByteBuffer sourceBuffer, int usage) {
        bind();
        this.size = sourceBuffer.remaining();
        glBufferData(GL_ARRAY_BUFFER, sourceBuffer, usage);
    }

    /**
     * Creates a new OpenGL-server-side data store for this buffer and uploads data from
     * the specified NIO buffer into the new data store.
     * This also binds this buffer to GL_ARRAY_BUFFER implicitly.
     * @param sourceBuffer the NIO buffer to read data from
     * @param usage the usage mode (see glBufferData() documentation for details)
     */
    public final void createDataStore(ShortBuffer sourceBuffer, int usage) {
        bind();
        this.size = sourceBuffer.remaining() * 2;
        glBufferData(GL_ARRAY_BUFFER, sourceBuffer, usage);
    }

    /**
     * Creates a new OpenGL-server-side data store for this buffer and uploads data from
     * the specified NIO buffer into the new data store.
     * This also binds this buffer to GL_ARRAY_BUFFER implicitly.
     * @param sourceBuffer the NIO buffer to read data from
     * @param usage the usage mode (see glBufferData() documentation for details)
     */
    public final void createDataStore(IntBuffer sourceBuffer, int usage) {
        bind();
        this.size = sourceBuffer.remaining() * 4;
        glBufferData(GL_ARRAY_BUFFER, sourceBuffer, usage);
    }

    /**
     * Creates a new OpenGL-server-side data store for this buffer and uploads data from
     * the specified NIO buffer into the new data store.
     * This also binds this buffer to GL_ARRAY_BUFFER implicitly.
     * @param sourceBuffer the NIO buffer to read data from
     * @param usage the usage mode (see glBufferData() documentation for details)
     */
    public final void createDataStore(FloatBuffer sourceBuffer, int usage) {
        bind();
        this.size = sourceBuffer.remaining() * 4;
        glBufferData(GL_ARRAY_BUFFER, sourceBuffer, usage);
    }

    /**
     * Creates a new OpenGL-server-side data store for this buffer and uploads data from
     * the specified NIO buffer into the new data store.
     * This also binds this buffer to GL_ARRAY_BUFFER implicitly.
     * @param sourceBuffer the NIO buffer to read data from
     * @param usage the usage mode (see glBufferData() documentation for details)
     */
    public final void createDataStore(DoubleBuffer sourceBuffer, int usage) {
        bind();
        this.size = sourceBuffer.remaining() * 8;
        glBufferData(GL_ARRAY_BUFFER, sourceBuffer, usage);
    }

    /**
     * Maps this buffer to main memory.
     * 
     * @param readable whether the mapped buffer should be readable
     * @param writeable whether the mapped buffer should be writable
     */
    public final void map(boolean readable, boolean writeable) {
        if (!readable && !writeable) {
            throw new IllegalArgumentException("requested buffer mapping that is neither readable nor writable");
        }
        int access = (!readable ? GL15.GL_WRITE_ONLY : !writeable ? GL15.GL_READ_ONLY : GL15.GL_READ_WRITE);
        GL15.glMapBuffer(GL_ARRAY_BUFFER, access, size, null);
    }

    /**
     * Unmaps this buffer from main memory.
     */
    public final void unmap() {
        GL15.glUnmapBuffer(GL_ARRAY_BUFFER);
    }

}