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1 /*******************************************************************************
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2 * Copyright (c) 2000, 2005 IBM Corporation and others.
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3 * All rights reserved. This program and the accompanying materials
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4 * are made available under the terms of the Eclipse Public License v1.0
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5 * which accompanies this distribution, and is available at
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6 * http://www.eclipse.org/legal/epl-v10.html
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7 *
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8 * Contributors:
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9 * Sebastian Davids - initial implementation
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10 * IBM Corporation
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11 * Port to the D programming language:
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12 * Bill Baxter <bill@billbaxter.com>
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13 *******************************************************************************/
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14 module org.eclipse.swt.snippets.Snippet174;
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15
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16 /*
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17 * SWT OpenGL snippet: draw a square
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18 *
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19 * This snippet requires the experimental org.eclipse.swt.opengl plugin, which
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20 * is not included in SWT by default and should only be used with versions of
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21 * SWT prior to 3.2. For information on using OpenGL in SWT see
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22 * http://www.eclipse.org/swt/opengl/ .
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23 *
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24 * For a list of all SWT example snippets see
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25 * http://www.eclipse.org/swt/snippets/
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26 *
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27 * @since 3.2
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28 */
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29 import org.eclipse.swt.SWT;
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30 import org.eclipse.swt.widgets.Display;
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31 import org.eclipse.swt.widgets.Shell;
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32 import org.eclipse.swt.graphics.Rectangle;
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33 import org.eclipse.swt.events.ControlEvent;
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34 import org.eclipse.swt.events.ControlAdapter;
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35 import org.eclipse.swt.layout.FillLayout;
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36 import org.eclipse.swt.opengl.GLCanvas;
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37 import org.eclipse.swt.opengl.GLData;
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38
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39 import derelict.opengl.gl;
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40 import derelict.opengl.glu;
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41
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42 import Math = tango.math.Math;
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43
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44 public static void main()
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45 {
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46 DerelictGL.load();
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47 DerelictGLU.load();
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48
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49 Display display = new Display();
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50 Shell shell = new Shell(display);
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51 shell.setText("OpenGL in SWT");
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52 shell.setLayout(new FillLayout());
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53 GLData data = new GLData();
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54 data.doubleBuffer = true;
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55 final GLCanvas canvas = new GLCanvas(shell, SWT.NO_BACKGROUND, data);
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56 canvas.addControlListener(new class ControlAdapter {
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57 public void controlResized(ControlEvent e) {
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58 resize(canvas);
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59 }
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60 });
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61 init(canvas);
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62 (new class Runnable {
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63 public void run() {
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64 if (canvas.isDisposed()) return;
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65 render();
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66 canvas.swapBuffers();
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67 canvas.getDisplay().timerExec(15, this);
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68 }
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69 }).run();
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70 shell.open();
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71 while (!shell.isDisposed()) {
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72 if (!display.readAndDispatch()) display.sleep();
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73 }
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74 display.dispose();
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75 }
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76
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77 static void init(GLCanvas canvas) {
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78 canvas.setCurrent();
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79 resize(canvas);
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80 glClearColor(1.0f, 1.0f, 1.0f, 1.0f);
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81 glColor3f(0.0f, 0.0f, 0.0f);
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82 glClearDepth(1.0f);
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83 glEnable(GL_DEPTH_TEST);
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84 glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST);
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85 }
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86
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87 static void render() {
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88 static int rot = 0;
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89 glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
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90 glLoadIdentity();
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91 glTranslatef(0.0f, 0.0f, -6.0f);
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92 glRotatef(rot++, 0,0,1);
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93 rot %= 360;
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94 glBegin(GL_QUADS);
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95 glVertex3f(-1.0f, 1.0f, 0.0f);
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96 glVertex3f(1.0f, 1.0f, 0.0f);
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97 glVertex3f(1.0f, -1.0f, 0.0f);
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98 glVertex3f(-1.0f, -1.0f, 0.0f);
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99 glEnd();
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100 }
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101
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102 static void resize(GLCanvas canvas) {
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103 canvas.setCurrent();
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104 Rectangle rect = canvas.getClientArea();
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105 int width = rect.width;
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106 int height = Math.max(rect.height, 1);
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107 glViewport(0, 0, width, height);
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108 glMatrixMode(GL_PROJECTION);
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109 glLoadIdentity();
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110 float aspect = cast(float) width / cast(float) height;
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111 gluPerspective(45.0f, aspect, 0.5f, 400.0f);
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112 glMatrixMode(GL_MODELVIEW);
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113 glLoadIdentity();
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114 }
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115
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