# HG changeset patch
# User Bill Baxter <bill@billbaxter.com>
# Date 1207791393 -32400
# Node ID d7e6c648cb57a40b06ac7f56a895af395606e707
# Parent  f773827465241c615d5c913d493141a12685b106
Port of OpenGL snippet 174.
THis one uses Display.timerExec instead of AsyncExec to do frame updates.

diff -r f77382746524 -r d7e6c648cb57 dsss.conf
--- a/dsss.conf	Wed Apr 09 06:32:06 2008 +0900
+++ b/dsss.conf	Thu Apr 10 10:36:33 2008 +0900
@@ -82,6 +82,7 @@
 }
 
 version(Derelict){
+    [dwtsnippets/opengl/Snippet174.d]
     [dwtsnippets/opengl/Snippet195.d]
 }
 
diff -r f77382746524 -r d7e6c648cb57 dwtsnippets/opengl/Snippet174.d
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dwtsnippets/opengl/Snippet174.d	Thu Apr 10 10:36:33 2008 +0900
@@ -0,0 +1,116 @@
+/*******************************************************************************
+ * Copyright (c) 2000, 2005 IBM Corporation and others.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ *     Sebastian Davids - initial implementation
+ *     IBM Corporation
+ * Port to the D programming language:
+ *     Bill Baxter <bill@billbaxter.com>
+ *******************************************************************************/
+module dwtsnippets.opengl.Snippet174;
+
+/*
+ * SWT OpenGL snippet: draw a square
+ * 
+ * This snippet requires the experimental org.eclipse.swt.opengl plugin, which
+ * is not included in SWT by default and should only be used with versions of
+ * SWT prior to 3.2.  For information on using OpenGL in SWT see
+ * http://www.eclipse.org/swt/opengl/ .
+ * 
+ * For a list of all SWT example snippets see
+ * http://www.eclipse.org/swt/snippets/
+ * 
+ * @since 3.2
+ */
+import dwt.DWT;
+import dwt.dwthelper.Runnable;
+import dwt.widgets.Display;
+import dwt.widgets.Shell;
+import dwt.graphics.Rectangle;
+import dwt.events.ControlEvent;
+import dwt.events.ControlAdapter;
+import dwt.layout.FillLayout;
+import dwt.opengl.GLCanvas;
+import dwt.opengl.GLData;
+
+import derelict.opengl.gl;
+import derelict.opengl.glu;
+
+import Math = tango.math.Math;
+
+public static void main() 
+{
+    DerelictGL.load();
+    DerelictGLU.load();
+
+    Display display = new Display();
+    Shell shell = new Shell(display);
+    shell.setText("OpenGL in DWT");
+    shell.setLayout(new FillLayout());
+    GLData data = new GLData();
+    data.doubleBuffer = true;
+    final GLCanvas canvas = new GLCanvas(shell, DWT.NO_BACKGROUND, data);
+    canvas.addControlListener(new class ControlAdapter {
+        public void controlResized(ControlEvent e) {
+            resize(canvas);
+        }
+    });
+    init(canvas);
+    (new class Runnable {
+        public void run() {
+            if (canvas.isDisposed()) return;
+            render();
+            canvas.swapBuffers();
+            canvas.getDisplay().timerExec(15, this);
+        }
+    }).run();
+    shell.open();
+    while (!shell.isDisposed()) {
+        if (!display.readAndDispatch()) display.sleep();
+    }
+    display.dispose();
+}
+
+static void init(GLCanvas canvas) {
+    canvas.setCurrent();
+    resize(canvas);
+    glClearColor(1.0f, 1.0f, 1.0f, 1.0f);
+    glColor3f(0.0f, 0.0f, 0.0f);
+    glClearDepth(1.0f);
+    glEnable(GL_DEPTH_TEST);
+    glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST);
+}
+
+static void render() {
+    static int rot = 0;
+    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+    glLoadIdentity();
+    glTranslatef(0.0f, 0.0f, -6.0f);
+    glRotatef(rot++, 0,0,1);
+    rot %= 360;
+    glBegin(GL_QUADS);
+    glVertex3f(-1.0f, 1.0f, 0.0f);
+    glVertex3f(1.0f, 1.0f, 0.0f);
+    glVertex3f(1.0f, -1.0f, 0.0f);
+    glVertex3f(-1.0f, -1.0f, 0.0f);
+    glEnd();
+}
+
+static void resize(GLCanvas canvas) {
+    canvas.setCurrent();
+    Rectangle rect = canvas.getClientArea();
+    int width = rect.width;
+    int height = Math.max(rect.height, 1);
+    glViewport(0, 0, width, height);
+    glMatrixMode(GL_PROJECTION);
+    glLoadIdentity();
+    float aspect = cast(float) width / cast(float) height;
+    gluPerspective(45.0f, aspect, 0.5f, 400.0f);
+    glMatrixMode(GL_MODELVIEW);
+    glLoadIdentity();
+}
+