/*
* Copyright (c) 2013, Oskar Veerhoek
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* The views and conclusions contained in the software and documentation are those
* of the authors and should not be interpreted as representing official policies,
* either expressed or implied, of the FreeBSD Project.
*/
package episode_18;
import org.lwjgl.BufferUtils;
import org.lwjgl.LWJGLException;
import org.lwjgl.opengl.Display;
import org.lwjgl.opengl.DisplayMode;
import java.nio.FloatBuffer;
import static org.lwjgl.opengl.GL11.*;
import static org.lwjgl.opengl.GL15.*;
/**
* Renders a colored triangle using Vertex Buffer Objects
*
* @author Oskar
*/
public class VertexBufferObjectDemo {
public static void main(String[] args) {
try {
Display.setDisplayMode(new DisplayMode(640, 480));
Display.setTitle("Vertex Buffer Object Demo");
Display.create();
} catch (LWJGLException e) {
e.printStackTrace();
Display.destroy();
System.exit(1);
}
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrtho(1, -1, 1, -1, 1, -1);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
final int amountOfVertices = 3;
final int vertexSize = 3;
final int colorSize = 3;
FloatBuffer vertexData = BufferUtils.createFloatBuffer(amountOfVertices * vertexSize);
vertexData.put(new float[]{-0.5f, -0.5f, 0, 0.5f, -0.5f, 0, 0.5f, 0.5f, 0});
vertexData.flip();
FloatBuffer colorData = BufferUtils.createFloatBuffer(amountOfVertices * colorSize);
colorData.put(new float[]{1, 0, 0, 0, 1, 0, 0, 0, 1});
colorData.flip();
int vboVertexHandle = glGenBuffers();
glBindBuffer(GL_ARRAY_BUFFER, vboVertexHandle);
glBufferData(GL_ARRAY_BUFFER, vertexData, GL_STATIC_DRAW);
glBindBuffer(GL_ARRAY_BUFFER, 0);
int vboColorHandle = glGenBuffers();
glBindBuffer(GL_ARRAY_BUFFER, vboColorHandle);
glBufferData(GL_ARRAY_BUFFER, colorData, GL_STATIC_DRAW);
glBindBuffer(GL_ARRAY_BUFFER, 0);
while (!Display.isCloseRequested()) {
glClear(GL_COLOR_BUFFER_BIT);
glBindBuffer(GL_ARRAY_BUFFER, vboVertexHandle);
glVertexPointer(vertexSize, GL_FLOAT, 0, 0L);
glBindBuffer(GL_ARRAY_BUFFER, vboColorHandle);
glColorPointer(colorSize, GL_FLOAT, 0, 0L);
glEnableClientState(GL_VERTEX_ARRAY);
glEnableClientState(GL_COLOR_ARRAY);
glDrawArrays(GL_TRIANGLES, 0, amountOfVertices);
glDisableClientState(GL_COLOR_ARRAY);
glDisableClientState(GL_VERTEX_ARRAY);
Display.update();
Display.sync(60);
}
glDeleteBuffers(vboVertexHandle);
glDeleteBuffers(vboColorHandle);
Display.destroy();
System.exit(0);
}
}