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This program displays a simple 3D rendering of a polygon using JOGL. Please note though that this code is a demonstration of the use of JOGL and as such makes use of immediate mode drawing commands; this serves to show how the conventional C style API is used through JOGL, but it is strongly recommended to make use of modern OpenGL techniques.
import com.jogamp.opengl.*;
import com.jogamp.opengl.fixedfunc.*;
import com.jogamp.opengl.util.Animator;
import com.jogamp.opengl.util.ImmModeSink;
import com.jogamp.newt.opengl.GLWindow;
/**
* Self-contained example (within a single class only to keep it simple)
* displaying a rotating quad
*/
public class JOGLQuadES1 implements GLEventListener {
private float rotateT = 0.0f;
private static Animator animator;
private static final ImmModeSink glSink = ImmModeSink.createFixed( 40,
3, GL.GL_FLOAT, // vertex
4, GL.GL_FLOAT, // color
0, GL.GL_FLOAT, // normal
0, GL.GL_FLOAT, // texCoords
GL.GL_STATIC_DRAW);
@Override
public void display(GLAutoDrawable gLDrawable) {
final GL2ES1 gl = gLDrawable.getGL().getGL2ES1();
gl.glClear(GL.GL_COLOR_BUFFER_BIT);
gl.glClear(GL.GL_DEPTH_BUFFER_BIT);
gl.glLoadIdentity();
gl.glTranslatef(0.0f, 0.0f, -5.0f);
// rotate about the three axes
gl.glRotatef(rotateT, 1.0f, 0.0f, 0.0f);
gl.glRotatef(rotateT, 0.0f, 1.0f, 0.0f);
gl.glRotatef(rotateT, 0.0f, 0.0f, 1.0f);
// Draw A Quad
// ES1 do not support glBegin(GL2.GL_QUADS)
// JogAmp JOGL can use its ImmModeSink class to emulate GL2 QUADS on ES1 hardware.
glSink.glBegin(glSink.GL_QUADS);
glSink.glColor3f(0.0f, 1.0f, 0.5f); // set the color of the quad
glSink.glVertex3f(-1.0f, 1.0f, 0.0f); // Top Left
glSink.glColor3f(1.0f, 0.0f, 0.5f);
glSink.glVertex3f( 1.0f, 1.0f, 0.0f); // Top Right
glSink.glColor3f(1.0f, 0.5f, 0.0f);
glSink.glVertex3f( 1.0f,-1.0f, 0.0f); // Bottom Right
glSink.glColor3f(0.0f, 0.5f, 1.0f);
glSink.glVertex3f(-1.0f,-1.0f, 0.0f); // Bottom Left
// Done Drawing The Quad
glSink.glEnd(gl);
// increasing rotation for the next iteration
rotateT += 0.2f;
}
@Override
public void init(GLAutoDrawable glDrawable) {
GL2ES1 gl = glDrawable.getGL().getGL2ES1();
gl.glShadeModel(GLLightingFunc.GL_SMOOTH);
gl.glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
gl.glClearDepth(1.0f);
gl.glEnable(GL.GL_DEPTH_TEST);
gl.glDepthFunc(GL.GL_LEQUAL);
gl.glHint(GL2ES1.GL_PERSPECTIVE_CORRECTION_HINT, GL.GL_NICEST);
}
@Override
public void reshape(GLAutoDrawable gLDrawable, int x, int y, int width, int height) {
GL2ES1 gl = gLDrawable.getGL().getGL2ES1();
final float aspect = (float) width / (float) height;
gl.glMatrixMode(GLMatrixFunc.GL_PROJECTION);
gl.glLoadIdentity();
final float fh = 0.5f;
final float fw = fh * aspect;
gl.glFrustumf(-fw, fw, -fh, fh, 1.0f, 1000.0f);
gl.glMatrixMode(GLMatrixFunc.GL_MODELVIEW);
gl.glLoadIdentity();
}
@Override
public void dispose(GLAutoDrawable glDrawable) {
animator.stop();
glSink.destroy(glDrawable.getGL());
}
public static void main(String[] args) {
GLCapabilities caps = new GLCapabilities(GLProfile.get(GLProfile.GL2ES1));
// We may at this point tweak the caps and request a translucent drawable
caps.setBackgroundOpaque(false);
GLWindow glWindow = GLWindow.create(caps);
animator = new Animator(glWindow);
glWindow.addGLEventListener(new JOGLQuadES1());
glWindow.setTitle("Jogl ES1 Quad drawing");
glWindow.setSize(600, 400);
glWindow.setVisible(true);
animator.start();
}
}
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