It’s been a while, but I’ve finally gotten back to this. I took Mithrandir’s advice and tried his native SWT version of JOGL and it worked quite well. Also, some of the rendering problems that I was having before have gone away. One problem that I did run into, and have not been able to resolve is that in my test application, the canvas does not display until I resize the window once. After that, it works fine. I’m sure that it’s a newbie problem, but I’m stumped. Here is the core code:
public class TorusView extends ViewPart {
public static final String ID = "Torus.view";
private GLCapabilities capabilities;
public static GLCanvas canvas;
private static GLContext context;
private static GLDrawable drawable;
private static int rot = 0;
public void createPartControl(Composite parent) {
parent.setLayout(new FillLayout());
capabilities = new GLCapabilities();
capabilities.setDoubleBuffered(true);
canvas = new GLCanvas(parent, SWT.NONE, capabilities, null, null);
drawable = canvas.getGLDrawable();
context = canvas.getGLContext();
canvas.addPaintListener(new PaintListener() {
public void paintControl(PaintEvent event) {
render();
}
});
canvas.addListener(SWT.Resize, new Listener() {
public void handleEvent(Event event) {
Rectangle bounds = canvas.getBounds();
float fAspect = (float) bounds.width / (float) bounds.height;
context.makeCurrent();
GL gl = context.getGL ();
gl.glViewport(0, 0, bounds.width, bounds.height);
gl.glMatrixMode(GL.GL_PROJECTION);
gl.glLoadIdentity();
GLU glu = new GLU();
glu.gluPerspective(45.0f, fAspect, 0.5f, 400.0f);
gl.glMatrixMode(GL.GL_MODELVIEW);
gl.glLoadIdentity();
context.release();
}
});
context.makeCurrent();
GL gl = context.getGL ();
gl.glClearColor(1.0f, 1.0f, 1.0f, 1.0f);
gl.glColor3f(1.0f, 0.0f, 0.0f);
gl.glHint(GL.GL_PERSPECTIVE_CORRECTION_HINT, GL.GL_NICEST);
gl.glClearDepth(1.0);
gl.glLineWidth(1);
gl.glEnable(GL.GL_DEPTH_TEST);
context.release();
}
public void setFocus() {
}
public static void render() {
if (!canvas.isDisposed()) {
context.makeCurrent();
GL gl = context.getGL ();
gl.glClear(GL.GL_COLOR_BUFFER_BIT | GL.GL_DEPTH_BUFFER_BIT);
gl.glClearColor(.3f, .5f, .8f, 1.0f);
gl.glLoadIdentity();
gl.glTranslatef(0.0f, 0.0f, -10.0f);
float frot = rot;
gl.glRotatef(0.15f * rot, 2.0f * frot, 10.0f * frot, 1.0f);
gl.glRotatef(0.3f * rot, 3.0f * frot, 1.0f * frot, 1.0f);
rot++;
gl.glPolygonMode(GL.GL_FRONT_AND_BACK, GL.GL_LINE);
gl.glColor3f(0.9f, 0.9f, 0.9f);
drawTorus(gl, 1, 1.9f + ((float) Math.sin((0.004f * frot))), 45, 45);
drawable.swapBuffers();
context.release();
}
}
static void drawTorus(GL gl, float r, float R, int nsides, int rings) {
float ringDelta = 2.0f * (float) Math.PI / rings;
float sideDelta = 2.0f * (float) Math.PI / nsides;
float theta = 0.0f, cosTheta = 1.0f, sinTheta = 0.0f;
for (int i = rings - 1; i >= 0; i--) {
float theta1 = theta + ringDelta;
float cosTheta1 = (float) Math.cos(theta1);
float sinTheta1 = (float) Math.sin(theta1);
gl.glBegin(GL.GL_QUAD_STRIP);
float phi = 0.0f;
for (int j = nsides; j >= 0; j--) {
phi += sideDelta;
float cosPhi = (float) Math.cos(phi);
float sinPhi = (float) Math.sin(phi);
float dist = R + r * cosPhi;
gl.glNormal3f(cosTheta1 * cosPhi, -sinTheta1 * cosPhi, sinPhi);
gl.glVertex3f(cosTheta1 * dist, -sinTheta1 * dist, r * sinPhi);
gl.glNormal3f(cosTheta * cosPhi, -sinTheta * cosPhi, sinPhi);
gl.glVertex3f(cosTheta * dist, -sinTheta * dist, r * sinPhi);
}
gl.glEnd();
theta = theta1;
cosTheta = cosTheta1;
sinTheta = sinTheta1;
}
}
}
