2837 lines
93 KiB
PHP
2837 lines
93 KiB
PHP
<?php
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require("../template.php");
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# Now set the title of the page:
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setPageTitle("API Documentation");
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# Make the header.
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generateHeader($_SERVER['PHP_SELF']);
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?>
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<p></p>
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<div style="font-size: 1.6em; font-weight: bold; text-align: center;">
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The Open-Source<br/>
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OpenGL Utility Toolkit<br/>
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(<i>freeglut</i> 3.0.0)<br/>
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Application Programming Interface
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</div>
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<p></p>
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<div style="font-size: 1.6em; font-weight: bold; text-align: center;">
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Version 4.0
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</div>
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<p></p>
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<div style="font-size: 1.2em; font-weight: bold; text-align: center;">
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The <i>freeglut</i> Programming Consortium<br/>
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January, 2013
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</div>
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<p>
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OpenGL is a trademark of Silicon Graphics, Inc. X Window System is a trademark
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of X Consortium, Inc. Spaceball is a registered trademark of Spatial
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Systems Inc.
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</p>
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<p>
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The authors have taken care in preparation of this documentation but make
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no expressed or implied warranty of any kind and assumes no responsibility
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for errors or omissions. No liability is assumed for incidental or consequential
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damages in connection with or arising from the use of information or programs
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contained herein.
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</p>
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<h1>1. <a name="Contents"></a>Contents</h1>
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<ol>
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<li><a href="#Contents">Contents</a></li>
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<li><a href="#Introduction">Introduction</a></li>
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<li><a href="#Background">Background</a>
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<ol>
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<li>Design Philosophy</li>
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<li>Conventions</li>
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<li>Terminology</li>
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<li>Differences from GLUT 3.7</li>
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</ol>
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</li>
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<li><a href="#Initialization">Initialization Functions</a>
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<ol>
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<li>glutInit</li>
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<li>glutInitWindowPosition, glutInitWindowSize</li>
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<li>glutInitDisplayMode</li>
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<li>glutInitDisplayString</li>
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<li>glutInitErrorFunc, glutInitWarningFunc</li>
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</ol>
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</li>
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<li><a href="#EventProcessing">Event Processing Functions</a>
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<ol>
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<li>glutMainLoop</li>
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<li>glutMainLoopEvent</li>
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<li>glutLeaveMainLoop</li>
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</ol>
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</li>
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<li><a href="#Window">Window Functions</a>
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<ol>
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<li>glutCreateWindow</li>
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<li>glutCreateSubwindow</li>
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<li>glutDestroyWindow</li>
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<li>glutSetWindow, glutGetWindow</li>
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<li>glutSetWindowTitle, glutSetIconTitle</li>
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<li>glutReshapeWindow</li>
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<li>glutPositionWindow</li>
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<li>glutShowWindow, glutHideWindow, glutIconifyWindow</li>
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<li>glutPushWindow, glutPopWindow</li>
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<li>glutFullScreen, glutLeaveFullScreen, glutFullScreenToggle</li>
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</ol>
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</li>
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<li><a href="#Display">Display Functions</a>
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<ol>
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<li>glutPostRedisplay</li>
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<li>glutPostWindowRedisplay</li>
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<li>glutSwapBuffers</li>
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</ol>
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</li>
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<li><a href="#MouseCursor">Mouse Cursor Functions</a>
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<ol>
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<li>glutSetCursor</li>
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<li>glutWarpPointer</li>
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</ol>
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</li>
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<li><a href="#Overlay">Overlay Functions</a>
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<ol>
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<li>glutEstablishOverlay</li>
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<li>glutRemoveOverlay</li>
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<li>glutUseLayer</li>
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<li>glutPostOverlayRedisplay</li>
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<li>glutPostWindowOverlayRedisplay</li>
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<li>glutShowOverlay, glutHideOverlay</li>
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</ol>
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</li>
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<li><a href="#Menu">Menu Functions</a>
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<ol>
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<li>glutCreateMenu</li>
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<li>glutDestroyMenu</li>
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<li>glutGetMenu, glutSetMenu</li>
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<li>glutAddMenuEntry</li>
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<li>glutAddSubMenu</li>
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<li>glutChangeToMenuEntry</li>
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<li>glutChangeToSubMenu</li>
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<li>glutSetMenuFont</li>
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<li>glutRemoveMenuItem</li>
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<li>glutAttachMenu, glutDetachMenu</li>
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<li>glutMenuDestroyFunc</li>
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</ol>
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</li>
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<li><a href="#GlobalCallback">Global Callback Registration Functions</a>
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<ol>
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<li>glutTimerFunc</li>
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<li>glutIdleFunc</li>
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<li>glutMenuStatusFunc</li>
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<li>glutMenuStateFunc</li>
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</ol>
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</li>
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<li><a href="#WindowCallback">Window-Specific Callback Registration Functions</a>
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<ol>
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<li>glutDisplayFunc</li>
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<li>glutOverlayDisplayFunc</li>
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<li>glutReshapeFunc</li>
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<li>glutPositionFunc</li>
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<li>glutCloseFunc</li>
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<li>glutKeyboardFunc</li>
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<li>glutSpecialFunc</li>
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<li>glutKeyboardUpFunc</li>
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<li>glutSpecialUpFunc</li>
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<li>glutMotionFunc, glutPassiveMotionFunc</li>
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<li>glutMouseFunc</li>
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<li>glutMouseWheelFunc</li>
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<li>glutEntryFunc</li>
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<li>glutJoystickFunc</li>
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<li>glutSpaceballMotionFunc</li>
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<li>glutSpaceballRotateFunc</li>
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<li>glutSpaceballButtonFunc</li>
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<li>glutButtonBoxFunc</li>
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<li>glutDialsFunc</li>
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<li>glutTabletMotionFunc</li>
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<li>glutTabletButtonFunc</li>
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<li>glutVisibilityFunc, glutWindowStatusFunc</li>
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</ol>
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</li>
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<li><a href="#StateSetting">State Setting and Retrieval Functions</a>
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<ol>
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<li>glutSetOption</li>
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<li>glutGet</li>
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<li>glutDeviceGet</li>
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<li>glutGetModifiers</li>
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<li>glutLayerGet</li>
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<li>glutExtensionSupported</li>
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<li>glutGetProcAddress</li>
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</ol>
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</li>
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<li><a href="#FontRendering">Font Rendering Functions</a>
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<ol>
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<li>glutBitmapCharacter</li>
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<li>glutBitmapString</li>
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<li>glutBitmapWidth</li>
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<li>glutBitmapLength</li>
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<li>glutBitmapHeight</li>
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<li>glutStrokeCharacter</li>
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<li>glutStrokeString</li>
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<li>glutStrokeWidth</li>
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<li>glutStrokeWidthf</li>
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<li>glutStrokeLength</li>
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<li>glutStrokeLengthf</li>
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<li>glutStrokeHeight</li>
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</ol>
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</li>
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<li><a href="#GeometricObject">Geometric Object Rendering Functions</a>
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<ol>
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<li>glutWireSphere, glutSolidSphere</li>
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<li>glutWireTorus, glutSolidTorus</li>
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<li>glutWireCone, glutSolidCone</li>
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<li>glutWireCube, glutSolidCube</li>
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<li>glutWireTetrahedron, glutSolidTetrahedron</li>
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<li>glutWireOctahedron, glutSolidOctahedron</li>
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<li>glutWireDodecahedron, glutSolidDodecahedron</li>
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<li>glutWireIcosahedron, glutSolidIcosahedron</li>
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<li>glutWireRhombicDodecahedron, glutSolidRhombicDodecahedron</li>
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<li>glutWireTeapot, glutSolidTeapot, glutWireTeacup,
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glutSolidTeacup, glutWireTeaspoon, glutSolidTeaspoon</li>
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<li>glutSetVertexAttribCoord3, glutSetVertexAttribNormal,
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glutSetVertexAttribTexCoord2</li>
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</ol>
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</li>
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<li><a href="#GameMode">Game Mode Functions</a>
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<ol>
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<li>glutGameModeString</li>
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<li>glutEnterGameMode, glutLeaveGameMode</li>
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<li>glutGameModeGet</li>
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</ol>
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</li>
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<li><a href="#VideoResize">Video Resize Functions</a>
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<ol>
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<li>glutVideoResizeGet</li>
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<li>glutSetupVideoResizing, glutStopVideoResizing</li>
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<li>glutVideoResize</li>
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<li>glutVideoPan</li>
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</ol>
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</li>
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<li><a href="#ColorMap">Color Map Functions</a>
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<ol>
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<li>glutSetColor, glutGetColor</li>
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<li>glutCopyColormap</li>
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</ol>
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</li>
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<li><a href="#MultiTouch">MultiTouch Functions</a>
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<ol>
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<li>glutMultiEntryFunc ← id, GLUT_ENTERED|GLUT_LEFT</li>
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<li>glutMultiButtonFunc ← id, x, y, button, GLUT_DOWN|GLUT_UP</li>
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<li>glutMultiMotionFunc ← id, x, y</li>
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<li>glutMultiPassiveFunc ← id, x, y</li>
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</ol>
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</li>
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<li><a href="#Mobile">Mobile functions</a>
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<ol>
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<li>glutInitContextFunc ← void</li>
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<li>glutAppStatusFunc ← event</li>
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</ol>
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</li>
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<li><a href="#Miscellaneous">Miscellaneous Functions</a>
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<ol>
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<li>glutSetKeyRepeat, glutIgnoreKeyRepeat</li>
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<li>glutForceJoystickFunc</li>
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<li>glutReportErrors</li>
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</ol>
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</li>
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<li><a href="#UsageNotes">Usage Notes</a>
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<ol>
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<li><a href="#ImplementationNotes">Implementation Notes</a></li>
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<li><a href="#GLUT_State">GLUT State</a></li>
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<li><a href="#Freeglut.h_Header">"freeglut.h" Header File</a></li>
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<li><a href="#References">References</a></li>
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<li><a href="#Index">Index</a></li>
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</ol>
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</li>
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</ol>
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<h1>2. <a name="Introduction"></a>Introduction</h1>
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<h1>3. <a name="Background"></a>Background</h1>
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<p>
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The OpenGL programming world owes a tremendous debt to Mr. Mark J. Kilgard
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for writing the OpenGL Utility Toolkit, or GLUT. The GLUT library
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of functions allows an application programmer to create, control, and manipulate
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windows independent of what operating system the program is running on.
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By hiding the dependency on the operating system from the application programmer,
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he allowed people to write truly portable OpenGL applications.
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</p>
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<p>
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Mr. Kilgard copyrighted his library and gave it a rather unusual license.
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Under his license, people are allowed freely to copy and distribute the libraries
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and the source code, but they are not allowed to modify it. For a long time this did
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not matter because the GLUT library worked so well and because Mr. Kilgard
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was releasing updates on a regular basis. But with the passage of time,
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people started wanting some slightly different behaviours in their windowing
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system. When Mr. Kilgard stopped supporting the GLUT library in 1999,
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having moved on to bigger and better things, this started to become a problem.
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</p>
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<p>
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In December 1999, Mr. Pawel Olzsta started work on an open-source clone of the
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GLUT library.
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This open-source clone, which does not use any of the GLUT source code, has
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evolved into the present <i>freeglut</i> library. This documentation
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specifies the application program interface to the <i>freeglut</i> library.
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</p>
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<h2>3.1 Design Philosophy</h2>
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<h2>3.2 <a name="Conventions"></a>Conventions</h2>
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<p>
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In developing the <i>freeglut</i> library, we have taken careful steps
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to ensure consistency in function operation across the board, in such a
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manner as to maintain compatibility with GLUT's behavior whenever
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possible. In this section some of the important conventions of FreeGLUT,
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and their compatibility with GLUT, are made explicit.
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</p>
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<h3>3.2.1 Window placement and size</h3>
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<p>
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There is considerable confusion about the "right thing to do" concerning
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window size and position. GLUT itself is not consistent between
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Windows and UNIX/X11; since platform independence is a virtue for
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<i>freeglut</i>, we decided to break with GLUT's behaviour. <br>
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Under UNIX/X11, it is apparently not possible to get the window border
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sizes in order to subtract them off the window's initial position until
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some time after the window has been created. Therefore we decided on
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the following behavior, both under Windows and under UNIX/X11:
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<ul><li>When you create a window with position (x,y) and size (w,h), the
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upper left hand corner of the outside of the window (the non-client
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area) is at (x,y) and the size of the drawable (client) area is (w,h).
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The coordinates taken by <tt>glutInitPosition</tt> and
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<tt>glutPositionWindow</tt>, as well as the coordinates provided by
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<i>FreeGLUT</i> when it calls the <tt>glutPositionFunc</tt> callback,
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specify the top-left of the non-client area of the window.</li>
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<li>When you query the size and position of the window using
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<tt>glutGet</tt>, <i>FreeGLUT</i> will return the size of the drawable
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area--the (w,h) that you specified when you created the window--and the
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coordinates of the upper left hand corner of the drawable (client)
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area--which is <u>NOT</u> the (x,y) position of the window you specified
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when you created it.</ul>
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</p>
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<h2>3.3 Terminology</h2>
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<h2>3.4 Differences from GLUT 3.7</h2>
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<p>
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Since the <i>freeglut</i> library was developed in order to update GLUT,
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it is natural that there will be some differences between the two.
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Each function in the API notes any differences between the GLUT and the <i>
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freeglut</i> function behaviours. The important ones are summarized
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here.
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</p>
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<h3>3.4.1 glutMainLoop Behaviour</h3>
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<p>
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One of the commonest complaints about the GLUT library was that once an
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application called <tt>glutMainLoop</tt>, it never got control back.
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There was no way for an application to loop in GLUT for a while, possibly
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as a subloop while a specific window was open, and then return to the calling
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function. A new function, <tt>glutMainLoopEvent</tt>, has been added
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to allow this functionality. Another function, <tt>glutLeaveMainLoop</tt>,
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has also been added to allow the application to tell <i>freeglut</i> to clean
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up and close down.
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</p>
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<h3>3.4.2 Action on Window Closure</h3>
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<p>
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Another difficulty with GLUT, especially with multiple-window programs,
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is that if the user clicks on the "x" in the window header the application
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exits immediately. The application programmer can now set an option,
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<tt> GLUT_ACTION_ON_WINDOW_CLOSE</tt>, to specify whether execution should
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continue, whether GLUT should return control to the main program, or whether
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GLUT should simply exit (the default).
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</p>
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<h3>3.4.3 Fullscreen windows</h3>
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<p>
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Function to leave fullscreen window mode, <tt>glutLeaveFullScreen</tt>,
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or to toggle between fullscreen and normal window mode,
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<tt>glutFullScreenToggle</tt>, have been added.
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</p>
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<h3>3.4.4 Changes to Callbacks</h3>
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<p>
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Several new callbacks have been added and several callbacks which were specific
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to Silicon Graphics hardware have not been implemented. Most or all
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of the new callbacks are listed in the GLUT Version 4 "glut.h" header file
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but did not make it into the documentation. The new callbacks consist
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of regular and special key release callbacks, a joystick callback, a menu
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state callback (with one argument, distinct from the menu status callback
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which has three arguments), a window status callback (also with one
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argument), and a window position callback. Unsupported callbacks are
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the two Tablet callbacks. If the user has a need for an unsupported
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callback he should contact the <i>freeglut</i> development team.
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</p>
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<h3>3.4.5 String Rendering</h3>
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<p>
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New functions have been added to render full character strings (including
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carriage returns) rather than rendering one character at a time. More
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functions return the widths of character strings and the font heights, in
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pixels for bitmapped fonts and in OpenGL units for the stroke fonts.
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</p>
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<h3>3.4.6 Geometry Rendering</h3>
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<p>
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Two functions have been added to render a wireframe and a solid rhombic
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dodecahedron. Furthermore, solid and wireframe versions of the original
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teacup and teaspoon that accompanied the famous Newell teapot. As these
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geometry functions are often used for teaching purposes,
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<tt>glutSetOption(GLUT_GEOMETRY_VISUALIZE_NORMALS,true/false)</tt> can
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now be used to visualize the normal vectors for each vertex. Lastly, to
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support drawing these objects with shaders, three functions have been
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added with which users can provide the addresses of the Coordinate,
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Normal and Texture Coordinate vertex attribs:
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<tt>glutSetVertexAttribCoord3</tt>, <tt>glutSetVertexAttribNormal</tt>,
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and <tt>glutSetVertexAttribTexCoord2</tt>. Texture coordinates are only
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generated for the teaset.
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</p>
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<h3>3.4.7 Extension Function Queries</h3>
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<p>
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glutGetProcAddress is a wrapper for the glXGetProcAddressARB and wglGetProcAddress
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functions.
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</p>
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<h1>4. <a name="Initialization"></a>Initialization Functions</h1>
|
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<h2>4.1 glutInit</h2>
|
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<h2>4.2 glutInitWindowPosition, glutInitWindowSize</h2>
|
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<p>
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The <tt>glutInitWindowPosition</tt> and <tt>glutInitWindowSize</tt>
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functions specify a desired position and size for windows that <i>freeglut</i>
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will create in the future.
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</p>
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<p><b>Usage</b></p>
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<p><tt>void glutInitWindowPosition ( int x, int y );</tt> <br/>
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<tt>void glutInitWindowSize ( int width, int height );</tt> </p>
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|
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<p><b>Description</b></p>
|
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|
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<p>
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The <tt>glutInitWindowPosition</tt> and <tt>glutInitWindowSize</tt>
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functions specify a desired position and size for windows that
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<i>freeglut</i> will create in the future.
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The position is measured in pixels from the upper left hand corner of the
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screen, with "x" increasing to the right and "y" increasing towards the bottom
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of the screen. The size is measured in pixels. <i>Freeglut</i>
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does not promise to follow these specifications in creating its windows,
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but it certainly makes an attempt to.
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</p>
|
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<p>
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The position and size of a window are a matter of some subtlety. Most
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windows have a usable area surrounded by a border and with a title bar
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on the top. The border and title bar are commonly called "decorations."
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The position of the window unfortunately varies with the operating system.
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On both Linux and Windows, you specify the coordinates of the upper
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left-hand corner of the window's decorations. Also for both operating
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systems, the size of the window is the size of the usable interior.<br>
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With <tt>glutGet</tt> information can be acquired about the current
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window's size, position and decorations. Note however that according to
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<a href="#Conventions">FreeGLUT's conventions</a>, the information
|
|
returned about the window coordinates does not correspond to the
|
|
coordinates used when setting window position. In addition, GLUT only
|
|
accepts positive window coordinates, and ignores all negative window
|
|
coordinates. But if GLUT_ALLOW_NEGATIVE_WINDOW_POSITION is enabled,
|
|
then negative window coordinates can be used. This is useful for
|
|
multi-montitor setups where the second monitor may be in the negative
|
|
desktop space of the primary monitor, as now the window can be placed
|
|
on the additional monitors.
|
|
</p>
|
|
|
|
<p>
|
|
Windows has some additional quirks which the application programmer
|
|
should know about. First, the minimum y-coordinate
|
|
of a window decoration is zero. (This is a feature of <i>freeglut</i>
|
|
and can be adjusted if so desired.) Second, there appears to be a
|
|
minimum window width on Windows which is 104 pixels. The user may specify
|
|
a smaller width, but the Windows system calls ignore it. It is also
|
|
impossible to make a window narrower than this by dragging on its corner.
|
|
</p>
|
|
|
|
<p><b>Changes From GLUT</b></p>
|
|
|
|
<p>
|
|
For some reason, GLUT is not affected by the 104-pixel minimum window width.
|
|
If the user clicks on the corner of a window which is narrower than this amount,
|
|
the window will immediately snap out to this width, but the application can
|
|
call <tt>glutReshapeWindow</tt> and make a window narrower again.
|
|
</p>
|
|
|
|
<p>
|
|
If GLUT_ALLOW_NEGATIVE_WINDOW_POSITION is enabled, <tt>glutInitWindowPosition</tt>
|
|
will accept negative window coordinates.
|
|
</p>
|
|
|
|
<h2>4.3 glutInitDisplayMode</h2>
|
|
|
|
<h2>4.4 glutInitDisplayString</h2>
|
|
<p><b>Changes From GLUT</b></p>
|
|
|
|
<p>
|
|
glutInitDisplayString support is limited: any of the tokens recognized
|
|
by GLUT are also recognized by <i>FreeGLUT</i>, but any statements with
|
|
comparators cannot (yet: do <a href="../help.php">help develop
|
|
this!</a>) be handled. Any spec (comparator and value) after the token
|
|
is ignored. However, many of these values can be set with glutSetOption
|
|
for now...
|
|
</p>
|
|
|
|
<h2>4.5 glutInitErrorFunc, glutInitWarningFunc</h2>
|
|
<p>
|
|
The <tt>glutInitErrorFunc</tt> and <tt>glutInitWarningFunc</tt>
|
|
functions specify callbacks that will be called upon warnings and errors
|
|
issued from within <i>FreeGLUT</i> so that the user can deal with these.
|
|
Useful for rerouting to another output sink (e.g., logging) and also to
|
|
avoid exit(1) being called upon error. As with other glutInit*
|
|
functions, these can be set before glutInit is called, so any output
|
|
from the library can be handled by the user.
|
|
</p>
|
|
|
|
<p><b>Usage</b></p>
|
|
<p><tt>void glutInitErrorFunc ( void (* callback)( const char *fmt, va_list ap) );</tt><br/>
|
|
<tt>void glutInitWarningFunc ( void (* callback)( const char *fmt, va_list ap) );</tt> </p>
|
|
|
|
<p><b>Description</b></p>
|
|
<p>
|
|
The users callback is passed a format string and a variable argument
|
|
list that can be passed to functions such as <tt>printf</tt>.<br />
|
|
Note that there are the preprocessor definitions
|
|
<tt>FREEGLUT_PRINT_ERRORS</tt> and <tt>FREEGLUT_PRINT_WARNINGS</tt>,
|
|
which affect <i>FreeGLUT</i>'s warning and error behavior when no user
|
|
callback is defined. If defined at library (not client app!) compile
|
|
time--by default it is, warnings and errors are printed to
|
|
<tt>stderr</tt>. If not defined, warnings and errors are muted (not
|
|
printed to stderr), though errors still trigger deinitialization and
|
|
exit. Whether <tt>FREEGLUT_PRINT_ERRORS</tt> and
|
|
<tt>FREEGLUT_PRINT_WARNINGS</tt> is defined does not affect whether the
|
|
client callback is called, it only affects whether warnings and errors
|
|
are printed to <tt>stderr</tt> when no callback is defined.
|
|
</p>
|
|
|
|
<p><b>Changes From GLUT</b></p>
|
|
<p>GLUT does not provide these functions.</p>
|
|
|
|
<h1>5. <a name="EventProcessing"></a>Event Processing Functions</h1>
|
|
|
|
<p>
|
|
After an application has finished initializing its windows and menus, it
|
|
enters an event loop. Within this loop, <i>freeglut</i> polls the
|
|
data entry devices (keyboard, mouse, etc.) and calls the application's appropriate
|
|
callbacks.
|
|
</p>
|
|
|
|
<p>
|
|
In GLUT, control never returned from
|
|
the event loop (as invoked by the <tt>glutMainLoop</tt> function) to the
|
|
calling function. This prevented an application from having re-entrant
|
|
code, in which GLUT could be invoked from within a callback, and it prevented
|
|
the application from doing any post-processing (such as freeing allocated
|
|
memory) after GLUT had closed down. <i>Freeglut</i> allows the application
|
|
programmer to specify more direct control over the event loop by means of
|
|
two new functions. The first, <tt>glutMainLoopEvent</tt>, processes
|
|
a single iteration of the event loop and allows the application to use a different
|
|
event loop controller or to contain re-entrant code. The second, <tt>
|
|
glutLeaveMainLoop</tt>, causes the event loop to exit nicely; this is preferable
|
|
to the application's calling <tt>exit</tt> from within a GLUT callback.
|
|
</p>
|
|
|
|
<h2>5.1 glutMainLoop</h2>
|
|
|
|
<p>
|
|
The <tt>glutMainLoop</tt> function enters the event loop.
|
|
</p>
|
|
|
|
<p><b>Usage</b></p>
|
|
|
|
<p><tt>void glutMainLoop ( void );</tt></p>
|
|
|
|
<p><b>Description</b></p>
|
|
|
|
<p>The <tt>glutMainLoop</tt> function
|
|
causes the program to enter the window event loop. An application should
|
|
call this function at most once. It will call any application callback
|
|
functions as required to process mouse clicks, mouse motion, key presses,
|
|
and so on.
|
|
</p>
|
|
|
|
<p><b>Changes From GLUT</b></p>
|
|
|
|
<p>
|
|
In GLUT, there was absolutely no way for the application programmer to
|
|
have control return from the <tt>glutMainLoop</tt> function to the
|
|
calling function. <i>Freeglut</i> allows the programmer
|
|
to force this by setting the <tt>GLUT_ACTION_ON_WINDOW_CLOSE</tt> option
|
|
and invoking the <tt>glutLeaveMainLoop</tt> function from one of the callbacks.
|
|
Stopping the program this way is preferable to simply calling <tt>exit</tt>
|
|
from within a callback because this allows <i>freeglut</i> to free allocated
|
|
memory and otherwise clean up after itself. (I know I just said this,
|
|
but I think it is important enough that it bears repeating.)
|
|
</p>
|
|
|
|
<h2>5.2 glutMainLoopEvent</h2>
|
|
|
|
<p>
|
|
The <tt>glutMainLoopEvent</tt> function processes a single iteration
|
|
in the <i>freeglut</i> event loop.
|
|
</p>
|
|
|
|
<p><b>Usage</b></p>
|
|
|
|
<p><tt>void glutMainLoopEvent ( void );</tt></p>
|
|
|
|
<p><b>Description</b></p>
|
|
|
|
<p>
|
|
The <tt>glutMainLoopEvent</tt> function causes <i>freeglut</i> to process
|
|
one iteration's worth of events in its event loop. This allows the application
|
|
to control its own event loop and still use the <i>freeglut</i> windowing system.
|
|
</p>
|
|
|
|
<p><b>Changes From GLUT</b></p>
|
|
|
|
<p>GLUT does not include this function.</p>
|
|
|
|
<h2>5.3 glutLeaveMainLoop</h2>
|
|
|
|
<p>
|
|
The <tt>glutLeaveMainLoop</tt> function causes <i>freeglut</i> to stop
|
|
its event loop.
|
|
</p>
|
|
|
|
<p><b>Usage</b></p>
|
|
|
|
<p><tt>void glutLeaveMainLoop ( void );</tt>
|
|
</p>
|
|
|
|
<p><b>Description</b></p>
|
|
|
|
<p>
|
|
The <tt>glutLeaveMainLoop</tt> function causes <i>freeglut</i> to stop the event loop. If the
|
|
<tt>GLUT_ACTION_ON_WINDOW_CLOSE</tt> option has been set to
|
|
<tt>GLUT_ACTION_GLUTMAINLOOP_RETURNS</tt> or
|
|
<tt>GLUT_ACTION_CONTINUE_EXECUTION</tt>, control will return to the
|
|
function which called <tt>glutMainLoop</tt>; otherwise the application
|
|
will exit.
|
|
</p>
|
|
|
|
<p>
|
|
If the application has two nested calls to <tt>glutMainLoop</tt> and calls
|
|
<tt>glutLeaveMainLoop</tt>, the behaviour
|
|
of <i>FreeGLUT</i> is undefined. It may leave only the inner nested
|
|
loop or it may leave both loops. If the reader has a strong preference
|
|
for one behaviour over the other he should contact the <i>FreeGLUT</i> Programming
|
|
Consortium and ask for the code to be fixed.
|
|
</p>
|
|
|
|
<p><b>Changes From GLUT</b></p>
|
|
|
|
<p>GLUT does not include this function.</p>
|
|
|
|
<h1>6. <a name="Window"></a>Window Functions</h1>
|
|
|
|
<h2>6.1 glutCreateWindow</h2>
|
|
|
|
<h2>6.2 glutCreateSubwindow</h2>
|
|
|
|
<p>
|
|
The <tt>glutCreateSubwindow</tt> function creates a subwindow of an existing window.
|
|
</p>
|
|
|
|
<p><b>Usage</b></p>
|
|
|
|
<p>
|
|
<tt>int glutCreateSubwindow(int window, int x, int y, int width, int height);</tt>
|
|
</p>
|
|
|
|
<p><b>Description</b></p>
|
|
|
|
<p>
|
|
Creates a subwindow of <i>window</i> that is at location <i>x</i> and <i>y</i>
|
|
relative to the window's upper-left corner, and is of the specified <i>width</i> and <i>height</i>. The newly created
|
|
window ID is returned by <tt>glutCreateSubwindow</tt>. By default, the position coordinates will only allow windows within the bounds of the parent.
|
|
Negative coordinates be treated as coordinates from the opposite edge for a given axis. In addition, the width of the window will be taken into account.
|
|
For example, if the parent window is 100 pixels wide, and the <i>x</i> is 10, and <i>width</i> is 20, the subwindow will be located at <tt>x = 10</tt>.
|
|
If <i>x</i> is -10, then the subwindow will be located at 70 <tt>(parent - abs(pos) - dim)</tt>. If the <i>width</i> or <i>height</i> are negative, then the dimension is taken as a
|
|
subtraction of the parent dimension. For example, if the parent window is 100 pixels wide, and the <i>x</i> is 10, and <i>width</i> is 20, the
|
|
subwindow will have a size of 20. If <i>width</i> is -20, then the subwindow will have a width of 70 <tt>(parent - pos - abs(dim))</tt>.
|
|
</p>
|
|
|
|
<p>
|
|
If GLUT_ALLOW_NEGATIVE_WINDOW_POSITION is enabled, the window behavior differs. Negative window coordinates are now accepted and may result in windows outside
|
|
of the viewing area, depending on the platform of operation. Negative <i>width</i> and <i>height</i> are still used as a subtraction of the parent window dimension,
|
|
but they do not take <i>x</i> or <i>y</i> into account. For example, if the parent window is 100 pixels wide, and the <i>x</i> is 10, and <i>width</i> is 20, the
|
|
subwindow will be located at <tt>x = 10</tt>. If <i>x</i> is -10, then the subwindow will be located at <tt>x = -10</tt>. If the parent window is 100 pixels wide,
|
|
and the <i>x</i> is 10, and <i>width</i> is 20, the subwindow will have a size of 20. If <i>width</i> is -20, then the subwindow will have a width of 80 <tt>(parent - abs(dim))</tt>.
|
|
</p>
|
|
|
|
<p><b>Changes From GLUT</b></p>
|
|
|
|
<p>
|
|
GLUT does not support negative <i>x</i> or <i>y</i>. Nor does it have GLUT_ALLOW_NEGATIVE_WINDOW_POSITION
|
|
which changes the the functionality of <tt>glutCreateSubwindow</tt>.
|
|
</p>
|
|
|
|
<h2>6.3 glutDestroyWindow</h2>
|
|
|
|
<h2>6.4 glutSetWindow, glutGetWindow</h2>
|
|
|
|
<h2>6.5 glutSetWindowTitle, glutSetIconTitle</h2>
|
|
|
|
<p>
|
|
The <tt>glutSetWindowTitle</tt>, <tt>glutSetIconTitle</tt> set the
|
|
window title for when the window is in a visible state and when it is in
|
|
an iconified state respectively.
|
|
</p>
|
|
|
|
<p><b>Usage</b></p>
|
|
|
|
<p><tt>glutSetWindowTitle(const char* title);</tt><br>
|
|
<tt>glutSetIconTitle(const char* title);</tt>
|
|
</p>
|
|
|
|
<p><b>Description</b></p>
|
|
|
|
<p>
|
|
Normally a window system displays a title for every top-level window in
|
|
the system. The initial title is set when you call glutCreateWindow().
|
|
By means of the <tt>glutSetWindowTitle</tt> function you can set the
|
|
titles for your top-level <i>FreeGLUT</i> windows. If you just want one
|
|
title for the window over the window's entire life, you should set it
|
|
when you open the window with glutCreateWindow().<br>
|
|
<tt>glutSetIconTitle</tt> sets the title to be displayed for the window
|
|
when it is in iconified (minimized) state.
|
|
</p>
|
|
|
|
<p><b>Changes From GLUT</b></p>
|
|
|
|
<p><tt>glutSetIconTitle</tt> does nothing in GLUT on Windows, but is
|
|
emulated on Windows by <i>FreeGLUT</i>.</p>
|
|
|
|
<h2>6.6 glutReshapeWindow</h2>
|
|
|
|
<h2>6.7 glutPositionWindow</h2>
|
|
|
|
<h2>6.8 glutShowWindow, glutHideWindow, glutIconifyWindow</h2>
|
|
|
|
<h2>6.9 glutPushWindow, glutPopWindow</h2>
|
|
|
|
<h2>6.10 glutFullScreen, glutLeaveFullScreen, glutFullScreenToggle</h2>
|
|
|
|
<p>
|
|
The <tt>glutFullScreen</tt>, <tt>glutLeaveFullScreen</tt> and
|
|
<tt>glutFullScreenToggle</tt> functions are used to transition the
|
|
current window between fullscreen and normal mode.
|
|
</p>
|
|
|
|
<p><b>Usage</b></p>
|
|
|
|
<p><tt>void glutFullScreen ( void );</tt><br>
|
|
<tt>void glutLeaveFullScreen ( void );</tt><br>
|
|
<tt>void glutFullScreenToggle ( void );</tt>
|
|
</p>
|
|
|
|
<p><b>Description</b></p>
|
|
|
|
<p>
|
|
The <tt>glutFullScreen</tt> function causes the current window to enter
|
|
fullscreen mode, <tt>glutLeaveFullScreen</tt> to go back to the window
|
|
size and position as it was before entering fullscreen mode, and
|
|
<tt>glutFullScreenToggle</tt> toggles between fullscreen and normal
|
|
mode.<br>
|
|
In multi-monitor setups on Windows 2000 and newer, the window will
|
|
become fullscreen on the monitor that it overlaps the most.<br>
|
|
Calls to these functions are ignored for gamemode and child windows.<br>
|
|
Use <tt>glutGet(GLUT_FULL_SCREEN)</tt> to query fullscreen state of
|
|
current window.
|
|
</p>
|
|
|
|
<p><b>Changes From GLUT</b></p>
|
|
|
|
<p>GLUT does not include the <tt>glutLeaveFullScreen</tt> and
|
|
<tt>glutFullScreenToggle</tt> functions.</p>
|
|
|
|
<h1>7. <a name="Display"></a>Display Functions</h1>
|
|
|
|
<h2>7.1 glutPostRedisplay</h2>
|
|
|
|
<h2>7.2 glutPostWindowRedisplay</h2>
|
|
|
|
<h2>7.3 glutSwapBuffers</h2>
|
|
|
|
<h1>8. <a name="MouseCursor"></a>Mouse Cursor Functions</h1>
|
|
|
|
<h2>8.1 glutSetCursor</h2>
|
|
|
|
<h2>8.2 glutWarpPointer</h2>
|
|
|
|
<h1>9. <a name="Overlay"></a>Overlay Functions</h1>
|
|
|
|
<p>
|
|
<i>Freeglut</i> does not allow overlays, although it does "answer the mail"
|
|
with function stubs so that GLUT-based programs can compile and link against
|
|
<i>freeglut</i> without modification.
|
|
</p>
|
|
|
|
<p>
|
|
If the reader needs overlays, he should contact the <i>freeglut</i> Programming
|
|
Consortium and ask for them to be implemented. He should also be prepared
|
|
to assist in the implementation.
|
|
</p>
|
|
|
|
<h2>9.1 glutEstablishOverlay</h2>
|
|
|
|
<p>
|
|
The <tt>glutEstablishOverlay</tt> function is not implemented in <i>freeglut</i>.
|
|
</p>
|
|
|
|
<p><b>Usage</b></p>
|
|
|
|
<p><tt>void glutEstablishOverlay ( void );</tt> </p>
|
|
|
|
<p><b>Description</b></p>
|
|
|
|
<p>
|
|
The <tt>glutEstablishOverlay</tt> function is not implemented in <i>freeglut</i>.
|
|
</p>
|
|
|
|
<p><b>Changes From GLUT</b></p>
|
|
|
|
<p>GLUT implements this function. </p>
|
|
|
|
<h2>9.2 glutRemoveOverlay</h2>
|
|
|
|
<p>
|
|
The <tt>glutRemoveOverlay</tt> function is not implemented in <i>freeglut</i>.
|
|
</p>
|
|
|
|
<p><b>Usage</b></p>
|
|
|
|
<p><tt>void glutRemoveOverlay ( void );</tt></p>
|
|
|
|
<p><b>Description</b></p>
|
|
|
|
<p>
|
|
The <tt>glutRemoveOverlay</tt> function
|
|
is not implemented in <i>freeglut</i>.
|
|
</p>
|
|
|
|
<p><b>Changes From GLUT</b></p>
|
|
|
|
<p>GLUT implements this function. </p>
|
|
|
|
<h2>9.3 glutUseLayer</h2>
|
|
|
|
<p>
|
|
The <tt>glutUseLayer</tt> function is not implemented in <i>freeglut</i>.
|
|
</p>
|
|
|
|
<p><b>Usage</b></p>
|
|
|
|
<p><tt>void glutUseLayer ( GLenum layer );</tt> </p>
|
|
|
|
<p><b>Description</b></p>
|
|
|
|
<p>
|
|
The <tt>glutUseLayer</tt> function
|
|
is not implemented in <i>freeglut</i>.
|
|
</p>
|
|
|
|
<p><b>Changes From GLUT</b></p>
|
|
|
|
<p>GLUT implements this function. </p>
|
|
|
|
<h2>9.4 glutPostOverlayRedisplay</h2>
|
|
|
|
<p>
|
|
The <tt>glutPostOverlayRedisplay</tt> function is not implemented in <i>freeglut</i>.
|
|
</p>
|
|
|
|
<p><b>Usage</b></p>
|
|
|
|
<p><tt>void glutPostOverlayRedisplay ( void );</tt> </p>
|
|
|
|
<p><b>Description</b></p>
|
|
|
|
<p>
|
|
The <tt>glutPostOverlayRedisplay</tt> function is not implemented
|
|
in <i>freeglut</i>.
|
|
</p>
|
|
|
|
<p><b>Changes From GLUT</b></p>
|
|
|
|
<p>GLUT implements this function. </p>
|
|
|
|
<h2>9.5 glutPostWindowOverlayRedisplay</h2>
|
|
|
|
<p>
|
|
The <tt>glutPostWindowOverlayRedisplay</tt> function is not implemented
|
|
in <i>freeglut</i>.
|
|
</p>
|
|
|
|
<p><b>Usage</b></p>
|
|
|
|
<p><tt>void glutPostWindowOverlayRedisplay ( int window );</tt> </p>
|
|
|
|
<p><b>Description</b></p>
|
|
|
|
<p>
|
|
The <tt>glutPostWindowOverlayRedisplay</tt> function is not implemented in <i>freeglut</i>.
|
|
</p>
|
|
|
|
<p><b>Changes From GLUT</b></p>
|
|
|
|
<p>GLUT implements this function. </p>
|
|
|
|
<h2>9.6 glutShowOverlay, glutHideOverlay</h2>
|
|
|
|
<p>
|
|
The <tt>glutShowOverlay</tt> and <tt>glutHideOverlay</tt> functions
|
|
are not implemented in <i>freeglut</i>.
|
|
</p>
|
|
|
|
<p><b>Usage</b></p>
|
|
|
|
<p><tt>void glutShowOverlay( void );</tt>
|
|
<br/>
|
|
<tt>void glutHideOverlay( void );</tt>
|
|
</p>
|
|
|
|
<p><b>Description</b></p>
|
|
|
|
<p>
|
|
The <tt>glutShowOverlay</tt> and <tt>glutHideOverlay</tt> functions are not implemented in <i>freeglut</i>.
|
|
</p>
|
|
|
|
<p><b>Changes From GLUT</b></p>
|
|
|
|
<p>GLUT implements these functions. </p>
|
|
|
|
<h1>10. <a name="Menu"></a>Menu Functions</h1>
|
|
|
|
<h2>10.1 glutCreateMenu</h2>
|
|
|
|
<h2>10.2 glutDestroyMenu</h2>
|
|
|
|
<h2>10.3 glutGetMenu, glutSetMenu</h2>
|
|
|
|
<h2>10.4 glutAddMenuEntry</h2>
|
|
|
|
<h2>10.5 glutAddSubMenu</h2>
|
|
|
|
<h2>10.6 glutChangeToMenuEntry</h2>
|
|
|
|
<h2>10.7 glutChangeToSubMenu</h2>
|
|
|
|
<h2>10.8 glutSetMenuFont</h2>
|
|
<p>
|
|
<tt>glutSetMenuFont</tt> sets the (bitmap) font to be used for drawing
|
|
the specified menu.
|
|
</p>
|
|
|
|
<p><b>Usage</b></p>
|
|
|
|
<p><tt>void glutSetMenuFont( int menuID, void* fontID );</tt>
|
|
</p>
|
|
|
|
<p><b>Description</b></p>
|
|
|
|
<p>
|
|
Only bitmap fonts (<tt>GLUT_BITMAP_xxx</tt>, see <a
|
|
href="#FontRendering">here</a> for a list) can be used as menu fonts. A
|
|
warning is issued and the request is ignored if the supplied font is a
|
|
stroke font, or an unknown font.
|
|
</p>
|
|
|
|
<p><b>Changes From GLUT</b></p>
|
|
|
|
<p>GLUT does not provide this function.</p>
|
|
|
|
<h2>10.9 glutRemoveMenuItem</h2>
|
|
|
|
<h2>10.10 glutAttachMenu, glutDetachMenu</h2>
|
|
|
|
<h2>10.11 glutMenuDestroyFunc</h2>
|
|
|
|
<h1>11. <a name="GlobalCallback"></a>Global Callback Registration Functions</h1>
|
|
|
|
<h2>11.1 glutTimerFunc</h2>
|
|
|
|
<h2>11.2 glutIdleFunc</h2>
|
|
|
|
<p>
|
|
The <tt>glutIdleFunc</tt> function sets the global idle callback. <i>
|
|
Freeglut</i> calls the idle callback when there are no inputs from the user.
|
|
</p>
|
|
|
|
<p><b>Usage</b></p>
|
|
|
|
<p><tt>void glutIdleFunc ( void (*func)
|
|
( void ) );</tt> </p>
|
|
|
|
<p><tt>func</tt>The new
|
|
global idle callback function </p>
|
|
|
|
<p><b>Description</b></p>
|
|
|
|
<p>
|
|
The <tt>glutIdleFunc</tt> function
|
|
specifies the function that <i>freeglut</i> will call to perform background
|
|
processing tasks such as continuous animation when window system events are
|
|
not being received. If enabled, this function is called continuously
|
|
from <i>freeglut</i> while no events are received. The callback function
|
|
has no parameters and returns no value. <i>Freeglut</i> does not change
|
|
the <i>current window</i> or the <i>current menu</i> before invoking the idle
|
|
callback; programs with multiple windows or menus must explicitly set the
|
|
<i>current window</i> and <i>current menu</i>
|
|
and not rely on its current setting. <br/>
|
|
The amount of computation and rendering done in an idle
|
|
callback should be minimized to avoid affecting the program's interactive
|
|
response. In general, no more than a single frame of rendering should
|
|
be done in a single invocation of an idle callback. Note that no actual
|
|
drawing to the framebuffer should be done from the idle callback, this
|
|
is not supported. While it might work on some platforms, it will not on
|
|
others or might stop working in the future. Drawing should be done in
|
|
the <tt>glutDisplayFunc</tt> callback.<br/>
|
|
Calling <tt>glutIdleFunc</tt> with a NULL argument
|
|
disables the call to an idle callback.
|
|
</p>
|
|
|
|
<p><b>Changes From GLUT</b></p>
|
|
|
|
<p>Application programmers should note that
|
|
if they have specified the "continue execution" action on window closure,
|
|
<i>freeglut</i> will continue to call the
|
|
idle callback after the user has closed a window by clicking on the "x" in
|
|
the window header bar. If the idle callback renders a particular window
|
|
(this is considered bad form but is frequently done anyway), the programmer
|
|
should supply a window closure callback for that window which changes or disables
|
|
the idle callback. </p>
|
|
|
|
<h2>11.3 glutMenuStatusFunc</h2>
|
|
|
|
<h2>11.4 glutMenuStateFunc</h2>
|
|
|
|
<h1>12. <a name="WindowCallback"></a>Window-Specific Callback Registration Functions</h1>
|
|
|
|
<h2>12.1 glutDisplayFunc</h2>
|
|
|
|
<h2>12.2 glutOverlayDisplayFunc</h2>
|
|
|
|
<h2>12.3 glutReshapeFunc</h2>
|
|
|
|
<h2>12.4 glutPositionFunc</h2>
|
|
|
|
<p>
|
|
The <tt>glutPositionFunc</tt> function sets the window's position
|
|
callback. <i>Freeglut</i> calls the position callback when the window is
|
|
repositioned/moved programatically or by the user.
|
|
</p>
|
|
|
|
<p><b>Usage</b></p>
|
|
|
|
<p><tt>void glutPositionFunc ( void
|
|
(* func)( int x, int y) );</tt></p>
|
|
|
|
<p><b>Description</b></p>
|
|
|
|
<p>When <i>FreeGLUT</i> calls this callback, it provides the new
|
|
position on the screen of the top-left of the <u>non-client area</u>,
|
|
that is, the same coordinates used by <tt>glutInitPosition</tt> and
|
|
<tt>glutPositionWindow</tt>. To get the position on the screen of the
|
|
top-left of the client area, use <tt>glutGet(GLUT_WINDOW_X)</tt> and
|
|
<tt>glutGet(GLUT_WINDOW_Y)</tt>. See <a href="#Conventions">FreeGLUT's
|
|
conventions</a> for more information.</p>
|
|
|
|
<p><b>Changes From GLUT</b></p>
|
|
|
|
<p>This function is not implemented in GLUT.</p>
|
|
|
|
<h2>12.5 glutCloseFunc</h2>
|
|
|
|
<p>
|
|
The <tt>glutCloseFunc</tt> function sets the window's close
|
|
callback. <i>Freeglut</i> calls the close callback when the window is
|
|
about to be destroyed.
|
|
</p>
|
|
|
|
<p><b>Usage</b></p>
|
|
|
|
<p><tt>void glutCloseFunc ( void (*func) ( void ) );</tt> </p>
|
|
|
|
<p><tt>func</tt> The window's new closure callback function <br/>
|
|
</p>
|
|
|
|
<p><b>Description</b></p>
|
|
|
|
<p>
|
|
The <tt>glutCloseFunc</tt> function specifies the function
|
|
that <i>freeglut</i> will call to notify the application that a window
|
|
is about to be closed, either because it is requested using
|
|
<tt>glutDestroyWindow</tt>, because the user clicked on the "x" in the
|
|
window header (for top-level windows only), or due to a pending closure
|
|
of a subwindow's parent window. In the first case, the closure callback
|
|
is not invoked from the <tt>glutDestroyWindow</tt> call, but at a
|
|
later time point.<br />
|
|
<i>Freeglut</i> sets the <i>current window</i> to the window
|
|
which is about to be closed when the callback is invoked. The window can
|
|
thus be retrieved in the callback using <tt>glutGetWindow</tt>.<br />
|
|
Users looking to prevent <i>FreeGLUT</i> from exiting when a window is
|
|
closed, should look into using glutSetOption to set
|
|
<tt>GLUT_ACTION_ON_WINDOW_CLOSE</tt>. Some settings will prevent the
|
|
application from exiting when a window is closed.<br />
|
|
Please note that <tt>glutWMCloseFunc</tt>, a deprecated function, is an
|
|
alias to <tt>glutCloseFunc</tt>.
|
|
|
|
<p><b>Changes From GLUT</b></p>
|
|
|
|
<p>This function is not implemented in GLUT.</p>
|
|
|
|
<h2>12.6 glutKeyboardFunc</h2>
|
|
|
|
<h2>12.7 glutSpecialFunc</h2>
|
|
|
|
<p>
|
|
The <tt>glutSpecialFunc</tt> function sets the window's special key press
|
|
callback. <i>Freeglut</i> calls the special key press callback when the
|
|
user presses a special key.
|
|
</p>
|
|
|
|
<p><b>Usage</b></p>
|
|
|
|
<p><tt>void glutSpecialFunc ( void (*func)
|
|
( int key, int x, int y ) );</tt> </p>
|
|
|
|
<p><tt>func </tt>The window's
|
|
new special key press callback function <br/>
|
|
<tt>key </tt>The
|
|
key whose press triggers the callback <br/>
|
|
<tt>x
|
|
</tt>The x-coordinate of the mouse relative
|
|
to the window at the time the key is pressed <br/>
|
|
<tt>y
|
|
</tt>The y-coordinate of the mouse relative
|
|
to the window at the time the key is pressed </p>
|
|
|
|
<p><b>Description</b></p>
|
|
|
|
<p>
|
|
The <tt>glutSpecialFunc</tt> function specifies the function
|
|
that <i>freeglut</i> will call when the user
|
|
presses a special key on the keyboard. The callback function has one
|
|
argument: the name of the function to be invoked ("called back") at
|
|
the time at which the special key is pressed. The function returns no
|
|
value. <i>Freeglut</i> sets the <i>current window</i> to the window
|
|
which is active when the callback is invoked. "Special keys" are the
|
|
function keys, the arrow keys, the Page Up and Page Down keys, and the Insert
|
|
key. The Delete key is considered to be a regular key. <br/>
|
|
Calling <tt>glutSpecialUpFunc</tt> with a NULL argument
|
|
disables the call to the window's special key press callback. </p>
|
|
|
|
<p>
|
|
The <tt>key</tt> argument may take one of the following defined constant values:
|
|
</p>
|
|
|
|
<ul>
|
|
<li><tt>GLUT_KEY_F1, GLUT_KEY_F2, ..., GLUT_KEY_F12</tt> - F1 through F12 keys</li>
|
|
<li><tt>GLUT_KEY_PAGE_UP, GLUT_KEY_PAGE_DOWN</tt> - Page Up and Page Down keys</li>
|
|
<li><tt>GLUT_KEY_HOME, GLUT_KEY_END</tt> - Home and End keys</li>
|
|
<li><tt>GLUT_KEY_LEFT, GLUT_KEY_RIGHT, GLUT_KEY_UP, GLUT_KEY_DOWN</tt> - Arrow keys</li>
|
|
<li><tt>GLUT_KEY_INSERT</tt> - Insert key</li>
|
|
</ul>
|
|
|
|
<p><b>Changes From GLUT</b></p>
|
|
|
|
<p>None.</p>
|
|
|
|
<h2>12.8 glutKeyboardUpFunc</h2>
|
|
|
|
<p>
|
|
The <tt>glutKeyboardUpFunc</tt> function sets the window's key release
|
|
callback. <i>Freeglut</i> calls the key release callback when the user releases
|
|
a key.
|
|
</p>
|
|
|
|
<p><b>Usage</b></p>
|
|
|
|
<p><tt>void glutKeyboardUpFunc ( void (*func)
|
|
( unsigned char key, int x, int y ) );</tt> </p>
|
|
|
|
<p><tt>func </tt>The window's
|
|
new key release callback function <br/>
|
|
<tt>key </tt>The
|
|
key whose release triggers the callback <br/>
|
|
<tt>x
|
|
</tt>The x-coordinate of the mouse relative
|
|
to the window at the time the key is released <br/>
|
|
<tt>y
|
|
</tt>The y-coordinate of the mouse relative
|
|
to the window at the time the key is released </p>
|
|
|
|
<p><b>Description</b></p>
|
|
|
|
<p>
|
|
The <tt>glutKeyboardUpFunc</tt>
|
|
function specifies the function that <i>freeglut</i> will call when the
|
|
user releases a key from the keyboard. The callback function has one
|
|
argument: the name of the function to be invoked ("called back") at
|
|
the time at which the key is released. The function returns no value.
|
|
<i>Freeglut</i> sets the <i>current window</i> to the window which is
|
|
active when the callback is invoked. <br/> While <i>freeglut</i> checks
|
|
for upper or lower case letters, it does not do so for non-alphabetical
|
|
characters. Nor does it account for the Caps-Lock key being on.
|
|
The operating system may send some unexpected characters to
|
|
<i>freeglut</i>, such as "8" when the user is pressing the Shift
|
|
key. <i>Freeglut</i> also invokes the callback when the user
|
|
releases the Control, Alt, or Shift keys, among others. Releasing
|
|
the Delete key causes this function to be invoked with a value of
|
|
127 for <tt>key</tt>. <br/> Calling <tt>glutKeyboardUpFunc</tt> with
|
|
a NULL argument disables the call to the window's key release callback.
|
|
</p>
|
|
|
|
<p><b>Changes From GLUT</b></p>
|
|
|
|
<p>This function is not implemented in GLUT
|
|
versions before Version 4. It has been designed to be as close to GLUT
|
|
as possible. Users who find differences should contact the
|
|
<i>freeglut</i> Programming Consortium to have them fixed. </p>
|
|
|
|
<h2>12.9 glutSpecialUpFunc</h2>
|
|
|
|
<p>
|
|
The <tt>glutSpecialUpFunc</tt> function sets the window's special key
|
|
release callback. <i>Freeglut</i> calls the special key release callback
|
|
when the user releases a special key.
|
|
</p>
|
|
|
|
<p><b>Usage</b></p>
|
|
|
|
<p><tt>void glutSpecialUpFunc ( void (*func)
|
|
( int key, int x, int y ) );</tt> </p>
|
|
|
|
<p><tt>func </tt>The window's
|
|
new special key release callback function <br/>
|
|
<tt>key </tt>The
|
|
key whose release triggers the callback <br/>
|
|
<tt>x
|
|
</tt>The x-coordinate of the mouse relative
|
|
to the window at the time the key is released <br/>
|
|
<tt>y
|
|
</tt>The y-coordinate of the mouse relative
|
|
to the window at the time the key is released </p>
|
|
|
|
<p><b>Description</b></p>
|
|
|
|
<p>
|
|
The <tt>glutSpecialUpFunc</tt>function specifies the function that <i>freeglut</i> will call when the
|
|
user releases a special key from the keyboard. The callback function
|
|
has one argument: the name of the function to be invoked ("called back")
|
|
at the time at which the special key is released. The function returns
|
|
no value. <i>Freeglut</i> sets the <i>current window</i> to the window
|
|
which is active when the callback is invoked. "Special keys" are the
|
|
function keys, the arrow keys, the Page Up and Page Down keys, and the Insert
|
|
key. The Delete key is considered to be a regular key. <br/>
|
|
Calling <tt>glutSpecialUpFunc</tt> with a NULL argument
|
|
disables the call to the window's special key release callback. </p>
|
|
|
|
<p>
|
|
The <tt>key</tt> argument may take one of the following defined constant values: </p>
|
|
|
|
<ul>
|
|
<li><tt>GLUT_KEY_F1, GLUT_KEY_F2, ..., GLUT_KEY_F12</tt> - F1 through F12 keys</li>
|
|
<li><tt>GLUT_KEY_PAGE_UP, GLUT_KEY_PAGE_DOWN</tt> - Page Up and Page Down keys</li>
|
|
<li><tt>GLUT_KEY_HOME, GLUT_KEY_END</tt> - Home and End keys</li>
|
|
<li><tt>GLUT_KEY_LEFT, GLUT_KEY_RIGHT, GLUT_KEY_UP, GLUT_KEY_DOWN</tt> - arrow keys</li>
|
|
<li><tt>GLUT_KEY_INSERT</tt> - Insert key</li>
|
|
</ul>
|
|
|
|
<p><b>Changes From GLUT</b></p>
|
|
|
|
<p>
|
|
This function is not implemented in GLUT
|
|
versions before Version 4. It has been designed to be as close to GLUT
|
|
as possible. Users who find differences should contact the
|
|
<i>freeglut</i> Programming Consortium to
|
|
have them fixed.
|
|
</p>
|
|
|
|
<h2>12.10 glutMotionFunc, glutPassiveMotionFunc</h2>
|
|
|
|
<h2>12.11 glutMouseFunc</h2>
|
|
|
|
<h2>12.12 glutMouseWheelFunc</h2>
|
|
|
|
<p>
|
|
The <tt>glutMouseWheelFunc</tt> function sets the window's mouse wheel
|
|
callback. <i>Freeglut</i> calls the mouse wheel callback when the user
|
|
spins the mouse wheel.
|
|
</p>
|
|
|
|
<p><b>Usage</b></p>
|
|
|
|
<p><tt>void glutMouseWheelFunc ( void( *callback )( int wheel, int
|
|
direction, int x, int y ));</tt></p>
|
|
|
|
<p><b>Description</b></p>
|
|
|
|
<p>If the mouse wheel is spun over your (sub)window, <i>FreeGLUT</i>
|
|
will report this via the MouseWheel callback. <tt>wheel</tt> is the wheel
|
|
number, <tt>direction</tt> is +/- 1, and <tt>x</tt> and <tt>y</tt> are
|
|
the mouse coordinates.<br><br>
|
|
If you do not register a wheel callback, wheel events will be reported
|
|
as mouse buttons.
|
|
</p>
|
|
|
|
<p><b>Changes From GLUT</b></p>
|
|
|
|
<p>This function is not implemented in GLUT.</p>
|
|
|
|
<h2>12.13 glutEntryFunc</h2>
|
|
|
|
<h2>12.14 glutJoystickFunc</h2>
|
|
|
|
<h2>12.15 glutSpaceballMotionFunc</h2>
|
|
|
|
<p>
|
|
The <tt>glutSpaceballMotionFunc</tt> function is implemented in
|
|
<i>freeglut</i> on X11 only. On other platforms, function stubs are
|
|
provided so that GLUT-based programs can compile and link against
|
|
<i>freeglut</i> without modification.
|
|
</p>
|
|
|
|
<p><b>Usage</b></p>
|
|
|
|
<p><tt>void glutSpaceballMotionFunc ( void
|
|
(* callback)( int x, int y, int z )</tt><tt> );</tt></p>
|
|
|
|
<p><b>Description</b></p>
|
|
|
|
<p>TODO</p>
|
|
|
|
<h2>12.16 glutSpaceballRotateFunc</h2>
|
|
|
|
<p>
|
|
The <tt>glutSpaceballRotateFunc</tt> function is implemented in
|
|
<i>freeglut</i> on X11 only. On other platforms, function stubs are
|
|
provided so that GLUT-based programs can compile and link against
|
|
<i>freeglut</i> without modification.
|
|
</p>
|
|
|
|
<p><b>Usage</b></p>
|
|
|
|
<p><tt>void glutSpaceballRotateFunc ( void
|
|
(* callback)( int x, int y, int z )</tt><tt> );</tt></p>
|
|
|
|
<p><b>Description</b></p>
|
|
|
|
<p>TODO</p>
|
|
|
|
<h2>12.17 glutSpaceballButtonFunc</h2>
|
|
|
|
<p>
|
|
The <tt>glutSpaceballButtonFunc</tt> function is implemented in
|
|
<i>freeglut</i> on X11 only. On other platforms, function stubs are
|
|
provided so that GLUT-based programs can compile and link against
|
|
<i>freeglut</i> without modification.
|
|
</p>
|
|
|
|
<p><b>Usage</b></p>
|
|
|
|
<p><tt>void glutSpaceballButtonFunc ( void
|
|
(* callback)( int button, int updown )</tt><tt> );</tt></p>
|
|
|
|
<p><b>Description</b></p>
|
|
|
|
<p>TODO</p>
|
|
|
|
<h2>12.18 glutButtonBoxFunc</h2>
|
|
|
|
<p>
|
|
The <tt>glutDialsFunc</tt> function sets the global dials&buttons box callback. Freeglut calls the callback when there is input from the box buttons.
|
|
</p>
|
|
|
|
<p><b>Usage</b></p>
|
|
|
|
<p>
|
|
<tt>void glutButtonBoxFunc ( void (* callback)( int button, int updown ) );</tt>
|
|
</p>
|
|
|
|
<p><b>Description</b></p>
|
|
|
|
<p>
|
|
The Dials&Buttons box is an ancient device presenting several pushable
|
|
or rotatable buttons, sending the events to the computer via serial
|
|
I/O.<br />
|
|
|
|
See <a
|
|
href="http://www.reputable.com/sgipix/sgi-dialnbutton1.jpg">http://www.reputable.com/sgipix/sgi-dialnbutton1.jpg</a>
|
|
[<a href="http://www.nekochan.net/reputable/sgipix.html">1</a>]
|
|
for instance.
|
|
</p>
|
|
|
|
<h2>12.19 glutDialsFunc</h2>
|
|
|
|
<p>
|
|
The <tt>glutDialsFunc</tt> function sets the global dials&buttons box callback. Freeglut calls the callback when there is input from the box dials.
|
|
</p>
|
|
|
|
<p><b>Usage</b></p>
|
|
|
|
<p><tt>void glutDialsFunc ( void (* callback)(
|
|
int dial, int value )</tt><tt> );</tt></p>
|
|
|
|
<p><b>Description</b></p>
|
|
|
|
<p>
|
|
The Dials&Buttons box is an ancient device presenting several pushable
|
|
or rotatable buttons, sending the events to the computer via serial
|
|
I/O.<br />
|
|
|
|
See <a
|
|
href="http://www.reputable.com/sgipix/sgi-dialnbutton1.jpg">http://www.reputable.com/sgipix/sgi-dialnbutton1.jpg</a>
|
|
[<a href="http://www.nekochan.net/reputable/sgipix.html">1</a>]
|
|
for instance.
|
|
</p>
|
|
|
|
<h2>12.20 glutTabletMotionFunc</h2>
|
|
|
|
<p>
|
|
The <tt>glutTabletMotionFunc</tt> function is not implemented in <i>
|
|
freeglut</i>, although the library does "answer the mail" to the extent
|
|
that a call to the function will not produce an error..
|
|
</p>
|
|
|
|
<p><b>Usage</b></p>
|
|
|
|
<p>
|
|
<tt>void glutTabletMotionFunc ( void (* callback)( int x, int y ) );</tt>
|
|
</p>
|
|
|
|
<p><b>Description</b></p>
|
|
|
|
<p>The <tt>glutTabletMotionFunc</tt> function
|
|
is not implemented in <i>freeglut</i>. </p>
|
|
|
|
<p><b>Changes From GLUT</b></p>
|
|
|
|
<p>GLUT implements this function. </p>
|
|
|
|
<h2>12.21 glutTabletButtonFunc</h2>
|
|
|
|
<p>
|
|
The <tt>glutTabletButtonFunc</tt> function is not implemented in <i>
|
|
freeglut</i>, although the library does "answer the mail" to the extent
|
|
that a call to the function will not produce an error..
|
|
</p>
|
|
|
|
<p><b>Usage</b></p>
|
|
|
|
<p><tt>void glutTabletButtonFunc ( void
|
|
(* callback)( int button, int updown, int x, int y )</tt><tt> );</tt></p>
|
|
|
|
<p><b>Description</b></p>
|
|
|
|
<p>
|
|
The <tt>glutTabletButtonFunc</tt> function
|
|
is not implemented in <i>freeglut</i>.
|
|
</p>
|
|
|
|
<p><b>Changes From GLUT</b></p>
|
|
|
|
<p>GLUT implements this function. </p>
|
|
|
|
<h2>12.22 glutVisibilityFunc, glutWindowStatusFunc</h2>
|
|
|
|
<p>
|
|
The <tt>glutVisibilityFunc</tt> and the <tt>glutWindowStatusFunc</tt>
|
|
functions set the window's visibility and windowStatus callbacks for the
|
|
current window. Setting one overwrites the other. <i>Freeglut</i> calls
|
|
these callbacks when the visibility status of a window changes.
|
|
</p>
|
|
|
|
<p><b>Usage</b></p>
|
|
|
|
<p><tt>void glutVisibilityFunc ( void( *callback )( int state ));</tt>
|
|
<br><tt>void glutWindowStatusFunc ( void( *callback )( int state ));</tt>
|
|
</p>
|
|
|
|
<p><b>Description</b></p>
|
|
|
|
<p>
|
|
<tt>glutVisibilityFunc</tt> is deprecated and superseded by the more
|
|
informative <tt>glutWindowStatusFunc</tt>.<br>
|
|
For <tt>glutWindowStatusFunc</tt>, the state callback parameter is one
|
|
of GLUT_HIDDEN, GLUT_FULLY_RETAINED, GLUT_PARTIALLY_RETAINED, or
|
|
GLUT_FULLY_COVERED depending on the current window status of the window.
|
|
GLUT_HIDDEN means that the window is not shown (often meaning that the
|
|
window is iconified). GLUT_FULLY_RETAINED means that the window is fully
|
|
retained (no pixels belonging to the window are covered by other
|
|
windows). GLUT_PARTIALLY_RETAINED means that the window is partially
|
|
retained (some but not all pixels belonging to the window are covered by
|
|
other windows). GLUT_FULLY_COVERED means the window is shown but no part
|
|
of the window is visible, i.e., until the window's status changes, all
|
|
further rendering to the window is discarded.<br>
|
|
GLUT considers a window visible if any pixel of the window is visible or
|
|
any pixel of any descendant window is visible on the screen.<br>
|
|
GLUT applications are encouraged to disable rendering and/or animation
|
|
when windows have a status of either GLUT_HIDDEN or
|
|
GLUT_FULLY_COVERED.<br>
|
|
If the window status callback for a window is disabled and later
|
|
re-enabled, the window status of the window is undefined; any change in
|
|
window window status will be reported, that is if you disable a window
|
|
status callback and re-enable the callback, you are guaranteed the next
|
|
window status change will be reported.<br>
|
|
Setting the window status callback for a window disables the visibility
|
|
callback set for the window (and vice versa). The visibility callback is
|
|
set with <tt>glutVisibilityFunc</tt>, and its
|
|
state callback parameter is either GLUT_NOT_VISIBLE or GLUT_VISIBLE
|
|
depending on the current visibility of the window. GLUT_VISIBLE does not
|
|
distinguish a window being totally versus partially visible.
|
|
GLUT_NOT_VISIBLE means no part of the window is visible, i.e., until the
|
|
window's visibility changes, all further rendering to the window is
|
|
discarded.<br>
|
|
Not all window managers support such finegrained callback messages or
|
|
can even ensure basic correctness. On Windows, there are no
|
|
notifications if the visibility status of a window changes and
|
|
<i>FreeGLUT</i> might be in visible state even if the window is fully
|
|
obscured by other windows.
|
|
</p>
|
|
|
|
<p><b>Changes From GLUT</b></p>
|
|
|
|
<p>None.</p>
|
|
|
|
<h1>13. <a name="StateSetting"></a>State Setting and Retrieval Functions</h1>
|
|
|
|
<h2>13.1 glutSetOption</h2>
|
|
|
|
<p>
|
|
Allows you to set some general state/option variables.
|
|
</p>
|
|
|
|
<p><b>Usage</b></p>
|
|
|
|
<p>
|
|
<tt>void glutSetOption ( GLenum eWhat, int value );</tt>
|
|
</p>
|
|
|
|
<p><b>Description</b></p>
|
|
|
|
<p>Stores the <tt>value</tt> into a state variable named by
|
|
<tt>eWhat</tt>.</p>
|
|
<p>
|
|
The following state variables can be set:
|
|
<ul>
|
|
<li>GLUT_ACTION_ON_WINDOW_CLOSE - Controls what happens when a window is
|
|
closed by the user or system. GLUT_ACTION_EXIT will immediately exit the
|
|
application (default, GLUT's behavior). GLUT_ACTION_GLUTMAINLOOP_RETURNS
|
|
will immediately return from the main loop.
|
|
GLUT_ACTION_CONTINUE_EXECUTION will contine execution of remaining
|
|
windows.</li>
|
|
<li>GLUT_INIT_DISPLAY_MODE - Set the display mode for a new window, see
|
|
<tt>glutInitDisplayMode</tt></li>
|
|
<li>GLUT_INIT_WINDOW_X - Set the initial horizontal position of new
|
|
windows.</li>
|
|
<li>GLUT_INIT_WINDOW_Y - Set the initial vertical position of new
|
|
windows.</li>
|
|
<li>GLUT_INIT_WINDOW_WIDTH - Set the width of new windows.</li>
|
|
<li>GLUT_INIT_WINDOW_HEIGHT - Set the height of new windows.</li>
|
|
<li>GLUT_RENDERING_CONTEXT - Set to either GLUT_CREATE_NEW_CONTEXT or
|
|
GLUT_USE_CURRENT_CONTEXT to indicate whether to share the current OpenGL
|
|
rendering context with new windows.</li>
|
|
<li>GLUT_WINDOW_CURSOR - Set the current window's cursor as if by
|
|
glutSetCursor().</li>
|
|
<li>GLUT_AUX - Set the number of auxiliary buffers requested for new
|
|
windows if GLUT_AUX was set in the displayMode.</li>
|
|
<li>GLUT_MULTISAMPLE - Set the number of samples to request for new
|
|
windows if GLUT_MULTISAMPLE was set in the displayMode.</li>
|
|
<li>GLUT_GEOMETRY_VISUALIZE_NORMALS - Set whether <a
|
|
href="#GeometricObject"><i>FreeGLUT</i>'s geometric object rendering
|
|
functions</a> also visualize the object's normals or not.</li>
|
|
<li>GLUT_STROKE_FONT_DRAW_JOIN_DOTS - Set whether join dots are drawn
|
|
between line segments when drawing letters of stroke fonts or not.</li>
|
|
<li>GLUT_ALLOW_NEGATIVE_WINDOW_POSITION - Set if negative positions can be
|
|
used for window coordinates.</li>
|
|
</ul>
|
|
</p>
|
|
|
|
<p><b>Changes From GLUT</b></p>
|
|
|
|
<p>This function is not implemented in GLUT.</p>
|
|
|
|
<h2>13.2 glutGet</h2>
|
|
|
|
|
|
<p>
|
|
The following state variables may be queried with <tt>glutGet</tt>.
|
|
The returned value is an integer.
|
|
</p>
|
|
|
|
<p>
|
|
example:<br>
|
|
<tt>int windowLeft = glutGet(GLUT_WINDOW_X);</tt>
|
|
</p>
|
|
|
|
<p>
|
|
These queries are with respect to the current window:
|
|
</p>
|
|
|
|
<ul>
|
|
<li>GLUT_WINDOW_X - window X position, see <a href="#Conventions">FreeGLUT's conventions</a></li>
|
|
<li>GLUT_WINDOW_Y - window Y position, see <a href="#Conventions">FreeGLUT's conventions</a></li>
|
|
<li>GLUT_WINDOW_WIDTH - window width, see <a href="#Conventions">FreeGLUT's conventions</a></li>
|
|
<li>GLUT_WINDOW_HEIGHT - window height, see <a href="#Conventions">FreeGLUT's conventions</a></li>
|
|
<li>GLUT_WINDOW_BORDER_WIDTH - window border width</li>
|
|
<li>GLUT_WINDOW_BORDER_HEIGHT - height of non-client area above window,
|
|
including both border and caption (if any)</li>
|
|
<li>GLUT_WINDOW_BUFFER_SIZE - number of color (including alpha) or color index bits per pixel</li>
|
|
<li>GLUT_WINDOW_STENCIL_SIZE - number of bits per stencil value</li>
|
|
<li>GLUT_WINDOW_DEPTH_SIZE - number of bits per depth value</li>
|
|
<li>GLUT_WINDOW_RED_SIZE - number of bits per red value</li>
|
|
<li>GLUT_WINDOW_GREEN_SIZE - number of bits per green value</li>
|
|
<li>GLUT_WINDOW_BLUE_SIZE - number of bits per blue value</li>
|
|
<li>GLUT_WINDOW_ALPHA_SIZE - number of bits per alpha value</li>
|
|
<li>GLUT_WINDOW_ACCUM_RED_SIZE - number of red bits in the accumulation buffer</li>
|
|
<li>GLUT_WINDOW_ACCUM_GREEN_SIZE - number of green bits in the accumulation buffer</li>
|
|
<li>GLUT_WINDOW_ACCUM_BLUE_SIZE - number of blue bits in the accumulation buffer</li>
|
|
<li>GLUT_WINDOW_ACCUM_ALPHA_SIZE - number of alpha bits in the accumulation buffer</li>
|
|
<li>GLUT_WINDOW_DOUBLEBUFFER - 1 if the color buffer is double buffered, 0 otherwise</li>
|
|
<li>GLUT_WINDOW_RGBA - 1 if the color buffers are RGB[A], 0 for color index</li>
|
|
<li>GLUT_WINDOW_PARENT - parent window ID</li>
|
|
<li>GLUT_WINDOW_NUM_CHILDREN - number of child windows</li>
|
|
<li>GLUT_WINDOW_COLORMAP_SIZE - number of entries in the window's colormap</li>
|
|
<li>GLUT_WINDOW_NUM_SAMPLES - number of samples per pixel if using multisampling</li>
|
|
<li>GLUT_WINDOW_STEREO - 1 if the window supports stereo, 0 otherwise</li>
|
|
<li>GLUT_WINDOW_CURSOR - current cursor</li>
|
|
<li>GLUT_WINDOW_FORMAT_ID - on Windows, return the pixel format number of the current window</li>
|
|
<li>GLUT_FULL_SCREEN - 1 if window is currently in fullscreen mode</li>
|
|
</ul>
|
|
|
|
<p>
|
|
These queries do not depend on the current window.
|
|
</p>
|
|
|
|
<ul>
|
|
<li>GLUT_SCREEN_WIDTH - width of the screen in pixels</li>
|
|
<li>GLUT_SCREEN_HEIGHT - height of the screen in pixels</li>
|
|
<li>GLUT_SCREEN_WIDTH_MM - width of the screen in millimeters</li>
|
|
<li>GLUT_SCREEN_HEIGHT_MM - height of the screen in millimeters</li>
|
|
<li>GLUT_MENU_NUM_ITEMS - number of items in the current menu</li>
|
|
<li>GLUT_DISPLAY_MODE_POSSIBLE - return 1 if the current display mode is supported, 0 otherwise</li>
|
|
<li>GLUT_INIT_WINDOW_X - X position last set by glutInitWindowPosition</li>
|
|
<li>GLUT_INIT_WINDOW_Y - Y position last set by glutInitWindowPosition</li>
|
|
<li>GLUT_INIT_WINDOW_WIDTH - width last set by glutInitWindowSize</li>
|
|
<li>GLUT_INIT_WINDOW_HEIGHT - height last set by glutInitWindowSize</li>
|
|
<li>GLUT_INIT_DISPLAY_MODE - display mode last set by
|
|
glutInitDisplayMode or glutSetOption(GLUT_INIT_DISPLAY_MODE, value)</li>
|
|
<li>GLUT_ELAPSED_TIME - time (in milliseconds) elapsed since glutInit or glutGet(GLUT_ELAPSED_TIME) was first called</li>
|
|
<li>GLUT_INIT_STATE - 1 if <i>freeglut</i> has been initialized through
|
|
a call to <tt>glutInit</tt></li>
|
|
<li>GLUT_VERSION - Return value will be X*10000+Y*100+Z where X is the
|
|
major version, Y is the minor version and Z is the patch level.
|
|
This query is only supported in <i>freeglut</i> (version 2.0.0 or later).</li>
|
|
<li>GLUT_ALLOW_NEGATIVE_WINDOW_POSITION - 1 if negative window positions are enabled, 0 otherwise</li>
|
|
</ul>
|
|
|
|
<h2>13.3 glutDeviceGet</h2>
|
|
|
|
<h2>13.4 glutGetModifiers</h2>
|
|
|
|
<h2>13.5 glutLayerGet</h2>
|
|
|
|
<h2>13.6 glutExtensionSupported</h2>
|
|
|
|
<h2>13.7 glutGetProcAddress</h2>
|
|
|
|
<p>
|
|
<tt>glutGetProcAddress</tt> returns
|
|
a pointer to a named GL or <i>freeglut</i> function.
|
|
</p>
|
|
|
|
<p><b>Usage</b></p>
|
|
|
|
<p><tt>void *glutGetProcAddress ( const char *procName );</tt></p>
|
|
|
|
<p><tt>procName</tt> Name of an OpenGL or GLUT function. </p>
|
|
|
|
<p><b>Description</b></p>
|
|
|
|
<p>
|
|
<tt>glutGetProcAddress</tt> is useful
|
|
for dealing with OpenGL extensions. If an application calls OpenGL extension
|
|
functions directly, that application will only link/run with an OpenGL library
|
|
that supports the extension. By using a function pointer returned from glutGetProcAddress(),
|
|
the application will avoid this hard dependency and be more portable and interoperate
|
|
better with various implementations of OpenGL.
|
|
</p>
|
|
|
|
<p>
|
|
Both OpenGL functions and <i>freeglut</i>
|
|
functions can be queried with this function.
|
|
</p>
|
|
|
|
<p><b>Changes From GLUT</b></p>
|
|
|
|
<p>GLUT does not include this function.
|
|
</p>
|
|
|
|
<h1>14. <a name="FontRendering"></a>Font Rendering Functions</h1>
|
|
|
|
<p>
|
|
<i>Freeglut</i> supports two types of font rendering: bitmap fonts,
|
|
which are rendered using the <tt>glBitmap</tt> function call, and stroke
|
|
fonts, which are rendered as sequences of OpenGL line segments. Because
|
|
they are rendered as bitmaps, the bitmap fonts tend to render more quickly
|
|
than stroke fonts, but they are less flexible in terms of scaling and rendering.
|
|
Bitmap font characters are positioned with calls to the <tt>glRasterPos*</tt>
|
|
functions while stroke font characters use the OpenGL transformations
|
|
to position characters.
|
|
</p>
|
|
|
|
<p>
|
|
It should be noted that <i>freeglut</i> fonts are similar but not identical to GLUT fonts.
|
|
At the moment, <i>freeglut</i> fonts do not support the "`" (backquote) and
|
|
"|" (vertical line) characters; in their place it renders asterisks.
|
|
</p>
|
|
|
|
<p>
|
|
<i>Freeglut</i> supports the following bitmap fonts:
|
|
</p>
|
|
|
|
<ul>
|
|
<li><tt>GLUT_BITMAP_8_BY_13</tt> - A variable-width font with every character fitting in a rectangle of 13 pixels high by at most 8 pixels wide.</li>
|
|
<li><tt>GLUT_BITMAP_9_BY_15</tt> - A variable-width font with every character fitting in a rectangle of 15 pixels high by at most 9 pixels wide.</li>
|
|
<li><tt>GLUT_BITMAP_TIMES_ROMAN_10</tt> - A 10-point variable-width Times Roman font.</li>
|
|
<li><tt>GLUT_BITMAP_TIMES_ROMAN_24</tt> - A 24-point variable-width Times Roman font.</li>
|
|
<li><tt>GLUT_BITMAP_HELVETICA_10</tt> - A 10-point variable-width Helvetica font.</li>
|
|
<li><tt>GLUT_BITMAP_HELVETICA_12</tt> - A 12-point variable-width Helvetica font.</li>
|
|
<li><tt>GLUT_BITMAP_HELVETICA_18</tt> - A 18-point variable-width Helvetica font.</li>
|
|
</ul>
|
|
|
|
<p>
|
|
<i>Freeglut</i> calls <tt>glRasterPos4v</tt> to advance the cursor by
|
|
the width of a character and to render carriage returns when appropriate.
|
|
It does not use any display lists in it rendering in bitmap fonts.
|
|
</p>
|
|
|
|
<p>
|
|
<i>Freeglut</i> supports
|
|
the following stroke fonts:
|
|
</p>
|
|
|
|
<ul>
|
|
<li><tt>GLUT_STROKE_ROMAN</tt> - A proportionally-spaced Roman Simplex font</li>
|
|
<li><tt>GLUT_STROKE_MONO_ROMAN</tt> - A fixed-width Roman Simplex font</li>
|
|
</ul>
|
|
|
|
<p>
|
|
<i>Freeglut</i> does not use any display lists in its rendering of stroke
|
|
fonts. It calls <tt>glTranslatef</tt> to advance the cursor by the
|
|
width of a character and to render carriage returns when appropriate.
|
|
</p>
|
|
|
|
<h2>14.1 glutBitmapCharacter</h2>
|
|
|
|
<p>
|
|
The <tt>glutBitmapCharacter</tt> function renders a single bitmapped
|
|
character in the <i>current window</i> using the specified font.
|
|
</p>
|
|
|
|
<p><b>Usage</b></p>
|
|
|
|
<p><tt>void glutBitmapCharacter ( void *font,
|
|
int character );</tt> </p>
|
|
|
|
<p><tt>font
|
|
</tt>The bitmapped font to use in rendering
|
|
the character <br/>
|
|
<tt>character </tt>The ASCII
|
|
code of the character to be rendered </p>
|
|
|
|
<p><b>Description</b></p>
|
|
|
|
<p>
|
|
The <tt>glutBitmapCharacter</tt> function renders the given character in the specified bitmap font.
|
|
<i>Freeglut</i> automatically sets the necessary
|
|
pixel unpack storage modes and restores the existing modes when it has finished.
|
|
Before the first call to <tt>glutBitMapCharacter</tt> the application
|
|
program should call <tt>glRasterPos*</tt> to set the position of the character
|
|
in the window. The <tt>glutBitmapCharacter</tt> function advances
|
|
the cursor position as part of its call to <tt>glBitmap</tt> and so the
|
|
application does not need to call <tt>glRasterPos*</tt> again for successive
|
|
characters on the same line. </p>
|
|
|
|
<p><b>Changes From GLUT</b></p>
|
|
|
|
<p>Nonexistent characters are rendered as
|
|
asterisks. The rendering position in <i>freeglut</i> is apparently off
|
|
from GLUT's position by a few pixels vertically and one or two pixels horizontally.
|
|
</p>
|
|
|
|
<h2>14.2 glutBitmapString</h2>
|
|
|
|
<p>
|
|
The <tt>glutBitmapString</tt> function renders a string of bitmapped
|
|
characters in the <i>current window</i> using the specified font.
|
|
</p>
|
|
|
|
<p><b>Usage</b></p>
|
|
|
|
<p><tt>void glutBitmapString ( void *font,
|
|
char *string );</tt> </p>
|
|
|
|
<p><tt>font
|
|
</tt>The bitmapped font to use in rendering
|
|
the character string <br/>
|
|
<tt>string </tt>String
|
|
of characters to be rendered </p>
|
|
|
|
<p><b>Description</b></p>
|
|
|
|
<p>
|
|
The <tt>glutBitmapString</tt> function renders the given character
|
|
string in the specified bitmap font.
|
|
<i>Freeglut</i> automatically sets the necessary
|
|
pixel unpack storage modes and restores the existing modes when it has finished.
|
|
Before calling <tt>glutBitMapString</tt> the application program should
|
|
call <tt>glRasterPos*</tt> to set the position of the string in the window.
|
|
The <tt>glutBitmapString</tt> function handles carriage returns.
|
|
Nonexistent characters are rendered as asterisks. </p>
|
|
|
|
<p><b>Changes From GLUT</b></p>
|
|
|
|
<p>GLUT does not include this function.
|
|
</p>
|
|
|
|
<h2>14.3 glutBitmapWidth</h2>
|
|
|
|
<p>
|
|
The <tt>glutBitmapWidth</tt> function returns the width in pixels of
|
|
a single bitmapped character in the specified font.
|
|
</p>
|
|
|
|
<p><b>Usage</b></p>
|
|
|
|
<p><tt>int glutBitmapWidth ( void *font,
|
|
int character );</tt> </p>
|
|
|
|
<p><tt>font
|
|
</tt>The bitmapped font to use in calculating
|
|
the character width <br/>
|
|
<tt>character </tt>The ASCII
|
|
code of the character </p>
|
|
|
|
<p><b>Description</b></p>
|
|
|
|
<p>The <tt>glutBitmapWidth</tt>
|
|
function returns the width of the given character in the specified bitmap
|
|
font. Because the font is bitmapped, the width is an exact integer.
|
|
</p>
|
|
|
|
<p><b>Changes From GLUT</b></p>
|
|
|
|
<p>Nonexistent characters return the width
|
|
of an asterisk. </p>
|
|
|
|
<h2>14.4 glutBitmapLength</h2>
|
|
|
|
<p>
|
|
The <tt>glutBitmapLength</tt> function returns the width in pixels of
|
|
a string of bitmapped characters in the specified font.
|
|
</p>
|
|
|
|
<p><b>Usage</b></p>
|
|
|
|
<p><tt>int glutBitmapLength ( void *font,
|
|
char *string );</tt> </p>
|
|
|
|
<p><tt>font </tt>The bitmapped
|
|
font to use in calculating the character width <br/>
|
|
<tt>string </tt>String of characters
|
|
whose width is to be calculated </p>
|
|
|
|
<p><b>Description</b></p>
|
|
|
|
<p>The <tt>glutBitmapLength</tt> function returns the width in pixels of the given character string in
|
|
the specified bitmap font. Because the font is bitmapped, the width
|
|
is an exact integer: the return value is identical to the sum of the
|
|
character widths returned by a series of calls to <tt>glutBitmapWidth</tt>.
|
|
The width of nonexistent characters is counted to be the width of
|
|
an asterisk. </p>
|
|
|
|
<p> If the string contains
|
|
one or more carriage returns, <i>freeglut</i> calculates the widths in pixels
|
|
of the lines separately and returns the largest width. </p>
|
|
|
|
<p><b>Changes From GLUT</b></p>
|
|
|
|
<p>GLUT does not include this function.
|
|
</p>
|
|
|
|
<h2>14.5 glutBitmapHeight</h2>
|
|
|
|
<p>
|
|
The <tt>glutBitmapHeight</tt> function returns the height in pixels of
|
|
the specified font.
|
|
</p>
|
|
|
|
<p><b>Usage</b></p>
|
|
|
|
<p><tt>int glutBitmapHeight ( void *font
|
|
);</tt> </p>
|
|
|
|
<p><tt>font
|
|
</tt>The bitmapped font to use in calculating
|
|
the character height </p>
|
|
|
|
<p><b>Description</b></p>
|
|
|
|
<p>The <tt>glutBitmapHeight</tt> function returns the height of a character in the specified bitmap font.
|
|
Because the font is bitmapped, the height is an exact integer. The fonts
|
|
are designed such that all characters have (nominally) the same height.
|
|
</p>
|
|
|
|
<p><b>Changes From GLUT</b></p>
|
|
|
|
<p>GLUT does not include this function.
|
|
</p>
|
|
|
|
<h2>14.6 glutStrokeCharacter</h2>
|
|
|
|
<p>
|
|
The <tt>glutStrokeCharacter</tt> function renders a single stroke character
|
|
in the <i>current window</i> using the specified font.
|
|
</p>
|
|
|
|
<p><b>Usage</b></p>
|
|
|
|
<p>
|
|
<tt>void glutStrokeCharacter ( void *font, int character );</tt>
|
|
</p>
|
|
|
|
<p><tt>font</tt>The stroke font to use in rendering the character <br/>
|
|
<tt>character</tt>The ASCII code of the character to be rendered
|
|
</p>
|
|
|
|
<p><b>Description</b></p>
|
|
|
|
<p>
|
|
The <tt>glutStrokeCharacter</tt> function renders the given character in the specified stroke font.
|
|
Before the first call to <tt>glutStrokeCharacter</tt> the application program
|
|
should call the OpenGL transformation (positioning and scaling) functions
|
|
to set the position of the character in the window. The <tt>glutStrokeCharacter</tt>
|
|
function advances the cursor position by a call to <tt>glTranslatef</tt>
|
|
and so the application does not need to call the OpenGL positioning functions
|
|
again for successive characters on the same line.
|
|
</p>
|
|
|
|
<p><b>Changes From GLUT</b></p>
|
|
|
|
<p>Nonexistent characters are rendered as
|
|
asterisks. </p>
|
|
|
|
<h2>14.7 glutStrokeString</h2>
|
|
|
|
<p>
|
|
The <tt>glutStrokeString</tt> function renders a string of characters
|
|
in the <i>current window</i> using the specified stroke font.
|
|
</p>
|
|
|
|
<p><b>Usage</b></p>
|
|
|
|
<p><tt>void glutStrokeString ( void *font,
|
|
char *string );</tt> </p>
|
|
|
|
<p><tt>font
|
|
</tt>The stroke font to use in rendering
|
|
the character string <br/>
|
|
<tt>string </tt>String
|
|
of characters to be rendered </p>
|
|
|
|
<p><b>Description</b></p>
|
|
|
|
<p>
|
|
The <tt>glutStrokeString</tt> function renders the given character string in the specified stroke font.
|
|
Before calling <tt>glutStrokeString</tt> the application program should
|
|
call the OpenGL transformation (positioning and scaling) functions to set
|
|
the position of the string in the window. The <tt>glutStrokeString</tt>
|
|
function handles carriage returns. Nonexistent characters are rendered
|
|
as asterisks. </p>
|
|
|
|
<p><b>Changes From GLUT</b></p>
|
|
|
|
<p>GLUT does not include this function.
|
|
</p>
|
|
|
|
<h2>14.8 glutStrokeWidth</h2>
|
|
|
|
<p>
|
|
The <tt>glutStrokeWidth</tt> function returns the width in model units of
|
|
a single character in the specified stroke font, rounded to an int.
|
|
</p>
|
|
|
|
<p><b>Usage</b> </p>
|
|
|
|
<p><tt>int glutStrokeWidth ( void *font,
|
|
int character );</tt> </p>
|
|
|
|
<p><tt>font
|
|
</tt>The stroke font to use in calculating
|
|
the character width <br/>
|
|
<tt>character </tt>The ASCII
|
|
code of the character </p>
|
|
|
|
<p><b>Description</b></p>
|
|
|
|
<p>
|
|
The <tt>glutStrokeWidth</tt>
|
|
function returns the width of the given character in the specified stroke
|
|
font. Because the font is a stroke font, the width is actually a floating-point
|
|
number; the function rounds it to the nearest integer for the return value.
|
|
</p>
|
|
|
|
<p><b>Changes From GLUT</b></p>
|
|
|
|
<p>Nonexistent characters return the width
|
|
of an asterisk. </p>
|
|
|
|
<h2>14.9 glutStrokeWidthf</h2>
|
|
|
|
<p>
|
|
The <tt>glutStrokeWidthf</tt> function returns the width in model units of
|
|
a single character in the specified stroke font.
|
|
</p>
|
|
|
|
<p><b>Usage</b> </p>
|
|
|
|
<p><tt>GLfloat glutStrokeWidthf ( void *font,
|
|
int character );</tt> </p>
|
|
|
|
<p><tt>font
|
|
</tt>The stroke font to use in calculating
|
|
the character width <br/>
|
|
<tt>character </tt>The ASCII
|
|
code of the character </p>
|
|
|
|
<p><b>Description</b></p>
|
|
|
|
<p>
|
|
The <tt>glutStrokeWidthf</tt>
|
|
function returns the width of the given character in the specified stroke
|
|
font. Function was included in an unreleased GLUT 3.8.
|
|
</p>
|
|
|
|
<p><b>Changes From GLUT</b></p>
|
|
|
|
<p>Nonexistent characters return the width
|
|
of an asterisk. </p>
|
|
|
|
<h2>14.10 glutStrokeLength</h2>
|
|
|
|
<p>
|
|
The <tt>glutStrokeLength</tt> function returns the width in model units of
|
|
a string of characters in the specified stroke font, rounded to an int.
|
|
</p>
|
|
|
|
<p><b>Usage</b></p>
|
|
|
|
<p><tt>int glutStrokeLength ( void *font,
|
|
char *string );</tt> </p>
|
|
|
|
<p><tt>font </tt>The stroke
|
|
font to use in calculating the character width <br/>
|
|
<tt>string </tt>String of characters
|
|
whose width is to be calculated </p>
|
|
|
|
<p><b>Description</b></p>
|
|
|
|
<p>
|
|
The <tt>glutStrokeLength</tt> function returns the width in model units of the given character string in
|
|
the specified stroke font. Because the font is a stroke font, the width
|
|
of an individual character is a floating-point number. <i>Freeglut</i>
|
|
adds the floating-point widths and rounds the final result to return the
|
|
integer value. Thus the return value may differ from the sum of the
|
|
character widths returned by a series of calls to <tt>glutStrokeWidth</tt>.
|
|
The width of nonexistent characters is counted to be the width
|
|
of an asterisk. </p>
|
|
|
|
<p>If the string contains
|
|
one or more carriage returns, <i>freeglut</i> calculates the widths in pixels
|
|
of the lines separately and returns the largest width. </p>
|
|
|
|
<h2>14.11 glutStrokeLengthf</h2>
|
|
|
|
<p>
|
|
The <tt>glutStrokeLengthf</tt> function returns the width in model units of
|
|
a string of characters in the specified stroke font.
|
|
</p>
|
|
|
|
<p><b>Usage</b></p>
|
|
|
|
<p><tt>GLfloat glutStrokeLengthf ( void *font,
|
|
char *string );</tt> </p>
|
|
|
|
<p><tt>font </tt>The stroke
|
|
font to use in calculating the character width <br/>
|
|
<tt>string </tt>String of characters
|
|
whose width is to be calculated </p>
|
|
|
|
<p><b>Description</b></p>
|
|
|
|
<p>
|
|
The <tt>glutStrokeLengthf</tt> function returns the width in model units of the given character string in
|
|
the specified stroke font. The return value is equal to the sum of the
|
|
character widths returned by a series of calls to
|
|
<tt>glutStrokeWidthf</tt>. Function was included in an unreleased GLUT 3.8.
|
|
The width of nonexistent characters is counted to be the width
|
|
of an asterisk. </p>
|
|
|
|
<p>If the string contains
|
|
one or more carriage returns, <i>freeglut</i> calculates the widths in pixels
|
|
of the lines separately and returns the largest width. </p>
|
|
|
|
<h2>14.12 glutStrokeHeight</h2>
|
|
|
|
<p>
|
|
The <tt>glutStrokeHeight</tt> function returns the height in pixels of
|
|
the specified font.
|
|
</p>
|
|
|
|
<p><b>Usage</b></p>
|
|
|
|
<p><tt>GLfloat glutStrokeHeight ( void *font
|
|
);</tt> </p>
|
|
|
|
<p><tt>font
|
|
</tt>The stroke font to use in calculating
|
|
the character height </p>
|
|
|
|
<p><b>Description</b></p>
|
|
|
|
<p>
|
|
The <tt>glutStrokeHeight</tt> function returns the height of a character in the specified stroke font.
|
|
The application programmer should note that, unlike the other <i>freeglut</i>
|
|
font functions, this one returns a floating-point number. The fonts
|
|
are designed such that all characters have (nominally) the same height. </p>
|
|
|
|
<p><b>Changes From GLUT</b></p>
|
|
|
|
<p>GLUT does not include this function.
|
|
</p>
|
|
|
|
<h1>15. <a name="GeometricObject"></a>Geometric Object Rendering Functions</h1>
|
|
|
|
<p>
|
|
<i>Freeglut</i> includes twenty two routines for generating
|
|
easily-recognizable 3-d geometric objects. These routines are
|
|
effectively the same ones that are included in the GLUT library, and
|
|
reflect the functionality available in the <i>aux</i> toolkit described
|
|
in the <i>OpenGL Programmer's Guide</i>. They are included to allow
|
|
programmers to create with a single line of code a three-dimensional
|
|
object which can be used to test a variety of OpenGL functionality.
|
|
None of the routines generates a display list for the object which it
|
|
draws. The functions generate normals appropriate for lighting but,
|
|
except for the teapot functions, do not generate texture coordinates. Do
|
|
note that depth testing (GL_LESS) should be enabled for the correct
|
|
drawing of the nonconvex objects, i.e., the glutTorus,
|
|
glutSierpinskiSponge, glutTeapot, glutTeacup and glutTeaspoon.<br>
|
|
Also see the <tt>GLUT_GEOMETRY_VISUALIZE_NORMALS</tt> option that can be
|
|
set with <tt>glutSetOption</tt>. Lastly, see
|
|
<tt>glutSetVertexAttribCoord3</tt>, <tt>glutSetVertexAttribNormal</tt>,
|
|
and <tt>glutSetVertexAttribTexCoord2</tt> if you wish to use these
|
|
objects with shaders.
|
|
</p>
|
|
|
|
<h2>15.1 glutWireSphere, glutSolidSphere</h2>
|
|
|
|
<p>
|
|
The <tt>glutWireSphere</tt> and <tt>glutSolidSphere</tt> functions
|
|
draw a wireframe and solid sphere respectively.
|
|
</p>
|
|
|
|
<p><b>Definition</b></p>
|
|
|
|
<p><tt>
|
|
void glutWireSphere (double dRadius, GLint slices, GLint stacks);<br>
|
|
void glutSolidSphere(double dRadius, GLint slices, GLint stacks);</tt> </p>
|
|
|
|
<p><b>Arguments</b></p>
|
|
<p><tt>dRadius </tt>The desired radius of the sphere </p>
|
|
|
|
<p><tt>slices </tt>The desired number of slices (divisions
|
|
in the longitudinal direction) in the sphere </p>
|
|
|
|
<p><tt>stacks </tt>The desired number of stacks (divisions
|
|
in the latitudinal direction) in the sphere. The number of points in
|
|
this direction, including the north and south poles, is <tt>stacks+1</tt></p>
|
|
|
|
<p><b>Description</b></p>
|
|
|
|
<p>The <tt>glutWireSphere</tt> and <tt>
|
|
glutSolidSphere</tt> functions render a sphere centered at the origin
|
|
of the modeling coordinate system. The north and south poles of the
|
|
sphere are on the positive and negative Z-axes respectively and the prime
|
|
meridian crosses the positive X-axis. </p>
|
|
|
|
<p><b>Changes From GLUT</b></p>
|
|
|
|
<p>None that we know of. </p>
|
|
|
|
<h2>15.2 glutWireTorus, glutSolidTorus</h2>
|
|
|
|
|
|
<p>
|
|
The <tt>glutWireTorus</tt> and <tt>glutSolidTorus</tt> functions draw
|
|
a wireframe and solid torus (donut shape) respectively.
|
|
</p>
|
|
|
|
<p><b>Definition</b></p>
|
|
|
|
<p><tt>
|
|
void glutWireTorus (double dInnerRadius, double dOuterRadius, GLint
|
|
nSides, GLint nRings);<br>
|
|
void glutSolidTorus(double dInnerRadius, double dOuterRadius, GLint
|
|
nSides, GLint nRings);</tt> </p>
|
|
|
|
<p><b>Arguments</b></p>
|
|
<p><tt>dInnerRadius </tt>The radius of the tube.</p>
|
|
|
|
<p><tt>dOuterRadius </tt>The distance from the center of the
|
|
Torus to the center of the tube.</p>
|
|
|
|
<p><tt>nSides </tt>The desired number of segments in a
|
|
single outer circle of the torus </p>
|
|
|
|
<p><tt>nRings </tt>The desired number of outer circles
|
|
around the origin of the torus </p>
|
|
|
|
<p><b>Description</b></p>
|
|
|
|
<p>The <tt>glutWireTorus</tt> and <tt>
|
|
glutSolidTorus</tt> functions render a torus centered at the origin of
|
|
the modeling coordinate system. The torus is circularly symmetric about
|
|
the Z-axis and starts at the positive X-axis. </p>
|
|
|
|
<p><b>Changes From GLUT</b></p>
|
|
|
|
<p>None that we know of. </p>
|
|
|
|
<h2>15.3 glutWireCylinder, glutSolidCylinder</h2>
|
|
|
|
<p>
|
|
The <tt>glutWireCylinder</tt> and <tt>glutSolidCylinder</tt> functions draw
|
|
a wireframe and solid cone respectively.
|
|
</p>
|
|
|
|
<p><b>Definition</b></p>
|
|
|
|
<p><tt>
|
|
void glutWireCylinder (double base, double height, GLint slices, GLint
|
|
stacks);<br>
|
|
void glutSolidCylinder(double base, double height, GLint slices, GLint
|
|
stacks);</tt> </p>
|
|
|
|
<p><b>Arguments</b></p>
|
|
<p><tt>radius </tt>The desired radius of the cylinder </p>
|
|
|
|
<p><tt>height </tt>The desired height of the cylinder </p>
|
|
|
|
<p><tt>slices </tt>The desired number of slices around
|
|
the cylinder </p>
|
|
|
|
<p><tt>stacks </tt>The desired number of segments between
|
|
the base and the top of the cylinder (the number of points, including
|
|
the tip, is <tt>stacks + 1</tt>) </p>
|
|
|
|
<h2>15.4 glutWireCone, glutSolidCone</h2>
|
|
|
|
<p>
|
|
The <tt>glutWireCone</tt> and <tt>glutSolidCone</tt> functions draw
|
|
a wireframe and solid cone respectively.
|
|
</p>
|
|
|
|
<p><b>Definition</b></p>
|
|
|
|
<p><tt>
|
|
void glutWireCone (double base, double height, GLint slices, GLint
|
|
stacks);<br>
|
|
void glutSolidCone(double base, double height, GLint slices, GLint
|
|
stacks);</tt> </p>
|
|
|
|
<p><b>Arguments</b></p>
|
|
<p><tt>base </tt>The desired radius of the base of the cone </p>
|
|
|
|
<p><tt>height </tt>The desired height of the cone </p>
|
|
|
|
<p><tt>slices </tt>The desired number of slices around
|
|
the base of the cone </p>
|
|
|
|
<p><tt>stacks </tt>The desired number of segments between
|
|
the base and the tip of the cone (the number of points, including the tip,
|
|
is <tt>stacks + 1</tt>) </p>
|
|
|
|
<p><b>Description</b></p>
|
|
|
|
<p>The <tt>glutWireCone</tt> and <tt>
|
|
glutSolidCone</tt> functions render a right circular cone with a base
|
|
centered at the origin and in the X-Y plane and its tip on the positive Z-axis.
|
|
The wire cone is rendered with triangular elements. </p>
|
|
|
|
<p><b>Changes From GLUT</b></p>
|
|
|
|
<p>None that we know of. </p>
|
|
|
|
<h2>15.5 glutWireCube, glutSolidCube</h2>
|
|
|
|
<p>
|
|
The <tt>glutWireCube</tt> and <tt>glutSolidCube</tt> functions draw a
|
|
wireframe and solid cube respectively.
|
|
</p>
|
|
|
|
<p><b>Definition</b></p>
|
|
|
|
<p><tt>
|
|
void glutWireCube (double dSize);<br>
|
|
void glutSolidCube(double dSize);</tt> </p>
|
|
|
|
<p><b>Arguments</b></p>
|
|
<p><tt>dSize </tt>The desired length of an edge of the cube</p>
|
|
|
|
<p><b>Description</b></p>
|
|
|
|
<p>The <tt>glutWireCube</tt> and <tt>
|
|
glutSolidCube</tt> functions render a cube of the desired size, centered
|
|
at the origin. Its faces are normal to the coordinate directions. </p>
|
|
|
|
<p><b>Changes From GLUT</b></p>
|
|
|
|
<p>None that we know of. </p>
|
|
|
|
<h2>15.6 glutWireTetrahedron, glutSolidTetrahedron</h2>
|
|
|
|
<p>
|
|
The <tt>glutWireTetrahedron</tt> and <tt>glutSolidTetrahedron</tt>
|
|
functions draw a wireframe and solid tetrahedron (four-sided Platonic solid)
|
|
respectively.
|
|
</p>
|
|
|
|
<p><b>Definition</b></p>
|
|
|
|
<p><tt>
|
|
void glutWireTetrahedron (void);<br>
|
|
void glutSolidTetrahedron(void);</tt></p>
|
|
|
|
<p><b>Description</b></p>
|
|
|
|
<p>The <tt>glutWireTetrahedron</tt> and
|
|
<tt>glutSolidTetrahedron</tt> functions render a tetrahedron whose corners
|
|
are each a distance of one from the origin. The length of each side
|
|
is 2/3 sqrt(6). One corner is on the positive X-axis and another is
|
|
in the X-Y plane with a positive Y-coordinate. </p>
|
|
|
|
<p><b>Changes From GLUT</b></p>
|
|
|
|
<p>None that we know of. </p>
|
|
|
|
<h2>15.7 glutWireOctahedron, glutSolidOctahedron</h2>
|
|
|
|
<p>
|
|
The <tt>glutWireOctahedron</tt> and <tt>glutSolidOctahedron</tt> functions
|
|
draw a wireframe and solid octahedron (eight-sided Platonic solid) respectively.
|
|
</p>
|
|
|
|
<p><b>Definition</b></p>
|
|
|
|
<p><tt>
|
|
void glutWireOctahedron (void);<br>
|
|
void glutSolidOctahedron(void);</tt></p>
|
|
|
|
<p><b>Description</b></p>
|
|
|
|
<p>The <tt>glutWireOctahedron</tt> and
|
|
<tt>glutSolidOctahedron</tt> functions render an octahedron whose corners
|
|
are each a distance of one from the origin. The length of each side
|
|
is sqrt(2). The corners are on the positive and negative coordinate
|
|
axes. </p>
|
|
|
|
<p><b>Changes From GLUT</b></p>
|
|
|
|
<p>None that we know of. </p>
|
|
|
|
<h2>15.8 glutWireDodecahedron, glutSolidDodecahedron</h2>
|
|
|
|
<p>
|
|
The <tt>glutWireDodecahedron</tt> and <tt>glutSolidDodecahedron</tt>
|
|
functions draw a wireframe and solid dodecahedron (twelve-sided Platonic
|
|
solid) respectively.
|
|
</p>
|
|
|
|
<p><b>Definition</b></p>
|
|
|
|
<p><tt>
|
|
void glutWireDodecahedron (void);<br>
|
|
void glutSolidDodecahedron(void);</tt></p>
|
|
|
|
<p><b>Description</b></p>
|
|
|
|
<p>The <tt>glutWireDodecahedron</tt> and
|
|
<tt>glutSolidDodecahedron</tt> functions render a dodecahedron whose corners
|
|
are each a distance of sqrt(3) from the origin. The length of each
|
|
side is sqrt(5)-1. There are twenty corners; interestingly enough,
|
|
eight of them coincide with the corners of a cube with sizes of length 2.
|
|
</p>
|
|
|
|
<p><b>Changes From GLUT</b></p>
|
|
|
|
<p>None that we know of. </p>
|
|
|
|
<h2>15.9 glutWireIcosahedron, glutSolidIcosahedron</h2>
|
|
|
|
<p>
|
|
The <tt>glutWireIcosahedron</tt> and <tt>glutSolidIcosahedron</tt>
|
|
functions draw a wireframe and solid icosahedron (twenty-sided Platonic solid)
|
|
respectively.
|
|
</p>
|
|
|
|
<p><b>Definition</b></p>
|
|
|
|
<p><tt>
|
|
void glutWireIcosahedron (void);<br>
|
|
void glutSolidIcosahedron(void);</tt></p>
|
|
|
|
<p><b>Description</b></p>
|
|
|
|
<p>
|
|
The <tt>glutWireIcosahedron</tt> and
|
|
<tt>glutSolidIcosahedron</tt> functions render an icosahedron whose corners
|
|
are each a unit distance from the origin. The length of each side is
|
|
slightly greater than one. Two of the corners lie on the positive and
|
|
negative X-axes.
|
|
</p>
|
|
|
|
<p><b>Changes From GLUT</b></p>
|
|
|
|
<p>None that we know of. </p>
|
|
|
|
<h2>15.10 glutWireRhombicDodecahedron, glutSolidRhombicDodecahedron</h2>
|
|
|
|
<p>
|
|
The <tt>glutWireRhombicDodecahedron</tt> and <tt>glutSolidRhombicDodecahedron</tt>
|
|
functions draw a wireframe and solid rhombic dodecahedron (twelve-sided
|
|
semi-regular solid) respectively.
|
|
</p>
|
|
|
|
<p><b>Definition</b></p>
|
|
|
|
<p><tt>
|
|
void glutWireRhombicDodecahedron (void);<br>
|
|
void glutSolidRhombicDodecahedron(void);</tt></p>
|
|
|
|
<p><b>Description</b></p>
|
|
|
|
<p>
|
|
The <tt>glutWireRhombicDodecahedron</tt> and <tt>glutSolidRhombicDodecahedron</tt>
|
|
functions render a rhombic
|
|
dodecahedron whose corners are at most a distance of one from the origin.
|
|
The rhombic dodecahedron has faces which are identical rhombuses (rhombi?)
|
|
but which have some vertices at which three faces meet and some vertices at
|
|
which four faces meet. The length of each side is sqrt(3)/2. Vertices
|
|
at which four faces meet are found at (0, 0, +/- 1) and (+/- sqrt(2)/2,
|
|
+/- sqrt(2)/2, 0).
|
|
</p>
|
|
|
|
<p><b>Changes From GLUT</b></p>
|
|
|
|
<p>GLUT does not include these functions.
|
|
</p>
|
|
|
|
<h2>15.11 glutWireTeapot, glutSolidTeapot, glutWireTeacup,
|
|
glutSolidTeacup, glutWireTeaspoon, glutSolidTeaspoon</h2>
|
|
|
|
<p>
|
|
The <tt>glutWireTeapot</tt> and <tt>glutSolidTeapot</tt> functions draw
|
|
a wireframe and solid teapot respectively, the <tt>glutWireTeacup</tt>
|
|
and <tt>glutSolidTeacup</tt> functions a wireframe and solid teacup, and
|
|
the <tt>glutWireTeaspoon</tt> and <tt>glutSolidTeaspoon</tt> functions a
|
|
wireframe and solid teaspoon.
|
|
</p>
|
|
|
|
<p><b>Definition</b></p>
|
|
|
|
<p><tt>
|
|
void glutWireTeapot (double dSize);<br>
|
|
void glutSolidTeapot (double dSize);<br>
|
|
void glutWireTeacup (double dSize);<br>
|
|
void glutSolidTeacup (double dSize);<br>
|
|
void glutWireTeaspoon (double dSize);<br>
|
|
void glutSolidTeaspoon(double dSize);</tt></p>
|
|
|
|
<p><b>Arguments</b></p>
|
|
<p><tt>dSize </tt>The desired size of the teapot, teacup and
|
|
teaspoon - relative to a "standard" size</p>
|
|
|
|
<p><b>Description</b></p>
|
|
|
|
<p>The <tt>glutWireTeapot</tt> and <tt> glutSolidTeapot</tt> functions
|
|
render a teapot of the desired size, centered at the origin. This is the
|
|
famous teapot created by Martin Newell. The other functions render the
|
|
teacup and teaspoon he used in the table scene figure in his PhD thesis.
|
|
Vertex data retrieved from: <a
|
|
href="ftp://ftp.funet.fi/pub/sci/graphics/packages/objects/teasetorig.gz">ftp://ftp.funet.fi/pub/sci/graphics/packages/objects/teasetorig.gz</a>.</p>
|
|
|
|
<p><b>Bugs</b></p>
|
|
<p>OpenGL's default <tt>glFrontFace</tt> state assumes that front facing
|
|
polygons (for the purpose of face culling) have vertices that wind
|
|
counter clockwise when projected into window space. This teapot, teacup
|
|
and teaspoon are rendered with their front facing polygon vertices
|
|
winding clockwise. For OpenGL's default back face culling to work, you
|
|
should use:</p>
|
|
|
|
<p><tt> glFrontFace(GL_CW);<br>
|
|
glutSolidTeapot(size);<br>
|
|
glFrontFace(GL_CCW);</tt></p>
|
|
|
|
<p>This bug reflect issues in the original teaset's vertex data
|
|
(and is thus present in GLUT too).</p>
|
|
|
|
<p><b>Changes From GLUT</b></p>
|
|
|
|
<p>GLUT only has the teapot and misses the rest of the teaset. </p>
|
|
|
|
<h2>15.12 glutSetVertexAttribCoord3, glutSetVertexAttribNormal, glutSetVertexAttribTexCoord2</h2>
|
|
<p>
|
|
To draw shapes with shaders (OpenGL 2 and later), one need to upload
|
|
vertices and associated normal vectors and texture coordinates to
|
|
vertex attributes of your shaders. Use these functions to set the
|
|
indices (addresses) of the vertex attributes in your currently active
|
|
shaders before calling the above geometry functions, and <i>FreeGLUT</i>
|
|
will upload the object geometry there. Texture coordinates are only
|
|
generated for the teapot, teacup and teaspoon.
|
|
</p>
|
|
|
|
<p><b>Definition</b></p>
|
|
|
|
<p><tt>
|
|
void glutSetVertexAttribCoord3 (GLint attrib);<br>
|
|
void glutSetVertexAttribNormal (GLint attrib);<br>
|
|
void glutSetVertexAttribTexCoord2(GLint attrib);</tt></p>
|
|
|
|
<p><b>Arguments</b></p>
|
|
<p><tt>attrib </tt>The index (address) of the vertex
|
|
attribute</p>
|
|
|
|
<p><b>Changes From GLUT</b></p>
|
|
|
|
<p>GLUT does not include these functions.</p>
|
|
|
|
<h1>16. <a name="GameMode"></a>Game Mode Functions</h1>
|
|
|
|
<h2>16.1 glutGameModeString</h2>
|
|
|
|
<p>
|
|
Specify the display mode that should be entered when GameMode is
|
|
entered. Default is the current display mode of the monitor on which the
|
|
GameMode screen will be opened.
|
|
</p>
|
|
|
|
<p><b>Usage</b><br>
|
|
A string is passed to this function that specifies a combination of
|
|
resolution, pixel depth (ignored on Linux) and refresh rate. Valid
|
|
formats are:
|
|
<ul>
|
|
<li>WxH:D@R</li>
|
|
<li>WxH:D</li>
|
|
<li>WxH@R</li>
|
|
<li>WxH</li>
|
|
<li>:D@R</li>
|
|
<li>:D</li>
|
|
<li>@R</li>
|
|
</ul>
|
|
Where W, H, D and R are placeholders for horizontal resolution, vertical
|
|
resolution, pixel depth and refresh rate respectively, as integers. Note
|
|
the "x", ":" and "@" characters.
|
|
</p>
|
|
|
|
<h2>16.2 glutEnterGameMode, glutLeaveGameMode</h2>
|
|
|
|
<p>
|
|
Attempt to change to the requested display mode and open the GameMode
|
|
window, or close the GameMode window and return to the original display
|
|
mode.
|
|
For multi-monitor display setups, <i>freeglut</i> can be told on which
|
|
monitor the gamemode window should be opened by providing the
|
|
<tt>-display</tt> command line option to <tt>glutInit</tt>.
|
|
</p>
|
|
|
|
<h2>16.3 glutGameModeGet</h2>
|
|
|
|
<p>
|
|
The following state variables may be queried with <tt>glutGet</tt>.
|
|
The returned value is an integer.
|
|
</p>
|
|
|
|
<p>
|
|
example:<br>
|
|
<tt>int windowLeft = glutGet(GLUT_WINDOW_X);</tt>
|
|
</p>
|
|
|
|
<ul>
|
|
<li>GLUT_GAME_MODE_ACTIVE - 1 if currently in GameMode</li>
|
|
<li>GLUT_GAME_MODE_DISPLAY_CHANGED - 1 if currently in GameMode</li>
|
|
<li>GLUT_GAME_MODE_POSSIBLE - 1 if display mode requested with
|
|
<tt>glutGameModeString</tt> is possible</li>
|
|
</ul>
|
|
|
|
<p>
|
|
These queries return information about the current display mode if in
|
|
GameMode, or about the requested display mode <u>before</u> entering
|
|
GameMode:
|
|
</p>
|
|
|
|
<ul>
|
|
<li>GLUT_GAME_MODE_WIDTH - (requested) width of GameMode window</li>
|
|
<li>GLUT_GAME_MODE_HEIGHT - (requested) height of GameMode window</li>
|
|
<li>GLUT_GAME_MODE_PIXEL_DEPTH - (requested) pixel depth of GameMode window</li>
|
|
<li>GLUT_GAME_MODE_REFRESH_RATE - (requested) refresh rate of GameMode window</li>
|
|
</ul>
|
|
|
|
<h1>17. <a name="VideoResize"></a>Video Resize Functions</h1>
|
|
|
|
<p>These functions are not implemented in <i>freeglut</i>.</p>
|
|
|
|
<h2>17.1 glutVideoResizeGet</h2>
|
|
|
|
<h2>17.2 glutSetupVideoResizing,
|
|
glutStopVideoResizing</h2>
|
|
|
|
<h2>17.3 glutVideoResize</h2>
|
|
|
|
<h2>17.4 glutVideoPan</h2>
|
|
|
|
<h1>18. <a name="ColorMap"></a>Color Map Functions</h1>
|
|
|
|
<h2>18.1 glutSetColor, glutGetColor</h2>
|
|
|
|
<h2>18.2 glutCopyColormap</h2>
|
|
|
|
<h1>19. <a name="MultiTouch"></a>MultiTouch Functions</h1>
|
|
|
|
MultiTouch callbacks are used to handle environments with multiple
|
|
inputs, such as a multi-touch screen, multi-touch touchpad, or
|
|
multiple mouses.<br />
|
|
|
|
<h2>19.1 glutMultiEntryFunc ← id, GLUT_ENTERED|GLUT_LEFT</h2>
|
|
<h2>19.2 glutMultiButtonFunc ← id, x, y, button, GLUT_DOWN|GLUT_UP</h2>
|
|
<h2>19.3 glutMultiMotionFunc ← id, x, y</h2>
|
|
<h2>19.4 glutMultiPassiveFunc ← id, x, y</h2>
|
|
|
|
These functions work like their non-multi variants, with an additional
|
|
'deviceid' parameter describing the current input device (mouse or
|
|
finger).<br />
|
|
|
|
Exception: in MultiButtonFunc, the order of callback parameters is
|
|
different (x,y,button,state instead of button,state,x,y).<br />
|
|
|
|
Currently, under X11, the non-multi callback variants are also called
|
|
on X11 for each event.<br />
|
|
|
|
Currently, under windows, the first (oldest) touch point also controls
|
|
the mouse cursor, which triggers the non-multi callbacks as
|
|
usual.<br />
|
|
|
|
<br />
|
|
|
|
Limitation: currently on the cursor id is provided. It may be
|
|
desirable to get the device id as well in the following situations:
|
|
|
|
<ul>
|
|
|
|
<li>Support a 2-fingers gesture such as pinch-to-zoom on the
|
|
touchscreen, while the mouse pointer or touchpad is performing an
|
|
unrelated action, not part of the touchscreen gesture (may not be
|
|
possible on some platforms).</li>
|
|
|
|
<li>Avoid touch id conflicts between touchscreen and
|
|
touchpad/gamepad on Android; a possible work-around is to shift the
|
|
device id in the touch id.</li>
|
|
|
|
</ul>
|
|
|
|
<p>Since this extra support comes at the cost of extra complexity, we're
|
|
<a href="http://sourceforge.net/mailarchive/forum.php?thread_name=20120518071314.GA28061%40perso.beuc.net&forum_name=freeglut-developer">considering</a>
|
|
whether/how to implement it.</p>
|
|
|
|
<h1>20. <a name="Mobile"></a>Mobile Functions</h1>
|
|
|
|
<p>These new callbacks were added:</p>
|
|
|
|
<ul>
|
|
<li><code>glutInitContextFunc ← void</code> : called when the context
|
|
is initialized or re-initialized (e.g. after a pause)</li>
|
|
<li><code>glutAppStatusFunc ← event</code> : called when the
|
|
application's status changes, with event identifying the state entered.
|
|
Possible states:
|
|
<ul>
|
|
<li>application goes on a pause (or a stop) → GLUT_APPSTATUS_PAUSE</li>
|
|
<li>application comes back from a pause → GLUT_APPSTATUS_RESUME. Is
|
|
called after the <code>glutInitContextFunc</code> callback.</li>
|
|
</ul>
|
|
</ul>
|
|
|
|
<p>Supported mobile platforms</p>
|
|
<ul>
|
|
<li>Android support is further described at
|
|
the <a href="android.php">Android page</a>.</li>
|
|
<li>BlackBerry 10/BlackBerry PlayBook</li>
|
|
</ul>
|
|
|
|
<h1>21. <a name="Miscellaneous"></a>Miscellaneous Functions</h1>
|
|
|
|
<h2>21.1 glutSetKeyRepeat, glutIgnoreKeyRepeat</h2>
|
|
|
|
<p>
|
|
The <tt>glutSetKeyRepeat</tt> and <tt>glutIgnoreKeyRepeat</tt> functions
|
|
set whether repeated key presses (generated by keeping a key depressed)
|
|
are passed on to the keyboard callbacks. <tt>glutSetKeyRepeat</tt>
|
|
allows to globally switch off key repeat, while
|
|
<tt>glutIgnoreKeyRepeat</tt> offers control over this behavior on a
|
|
per-window basis.
|
|
</p>
|
|
|
|
<p><b>Definition</b></p>
|
|
|
|
<p><tt>
|
|
void glutSetKeyRepeat (int repeatMode);<br>
|
|
void glutIgnoreKeyRepeat(int ignore);</tt></p>
|
|
|
|
<p><b>Arguments</b></p>
|
|
<p><tt>glutSetKeyRepeat's repeatMode </tt>
|
|
GLUT_KEY_REPEAT_OFF to globally switch key repeat off, or
|
|
GLUT_KEY_REPEAT_ON and GLUT_KEY_REPEAT_DEFAULT to globally switch key
|
|
repeat on.<br>
|
|
<tt>glutIgnoreKeyRepeat's ignore </tt> if non-zero, key
|
|
repeat is switched off for the current window.</p>
|
|
|
|
<p><b>Notes</b></p>
|
|
|
|
<p>If key repeat is globally switched off through
|
|
<tt>glutSetKeyRepeat</tt>, it cannot be reenabled on a per-window basis
|
|
with <tt>glutIgnoreKeyRepeat</tt>. If you want per-window control of key
|
|
repeat, set <tt>glutSetKeyRepeat</tt> to <tt>GLUT_KEY_REPEAT_ON</tt> and
|
|
use <tt>glutIgnoreKeyRepeat(GL_TRUE)</tt> to switch off key repeat for
|
|
the windows for which you don't want it.</p>
|
|
|
|
<p><b>Changes From GLUT</b></p>
|
|
|
|
<p>Nate Robbins' port of GLUT to win32 did not implement
|
|
<tt>glutSetKeyRepeat</tt>, but <i>FreeGLUT</i>'s behavior should conform on all
|
|
platforms to GLUT's behavior on X11.</p>
|
|
|
|
<h2>21.2 glutForceJoystickFunc</h2>
|
|
|
|
<h2>21.3 glutReportErrors</h2>
|
|
|
|
<h1>22. <a name="UsageNotes"></a>Usage Notes</h1>
|
|
|
|
<p> The following environment variables
|
|
are recognized by <i>freeglut</i>:
|
|
</p>
|
|
|
|
<ul>
|
|
<li>DISPLAY - specifies a display name.</li>
|
|
<li>GLUT_FPS - specifies a time interval
|
|
(in milliseconds) for reporting framerate messages to stderr. For example,
|
|
if FREEGLUT_FPS is set to 5000, every 5 seconds a message will be printed
|
|
to stderr showing the current frame rate. The frame rate is measured by counting
|
|
the number of times glutSwapBuffers() is called over the time interval.</li>
|
|
</ul>
|
|
|
|
<p>
|
|
Furthermore, on windows, there is a resource file identifier GLUT_ICON
|
|
that you can specify for your executable file. It specifies the icon
|
|
that goes in the upper left-hand corner of the <i>freeglut</i> windows.
|
|
Your application's resource file should contain the line:<br>
|
|
<tt>GLUT_ICON ICON DISCARDABLE "icon.ico"</tt><br> where
|
|
icon.ico is the filename of your icon. The One demo includes such an
|
|
icon as an example.
|
|
</p>
|
|
|
|
<h2>21.1 <a name="ImplementationNotes"></a>Implementation Notes</h2>
|
|
|
|
<h2>21.2 <a name="GLUT_State"></a>GLUT State</h2>
|
|
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<h2>21.3 <a name="Freeglut.h_Header"></a>"freeglut.h" Header File</h2>
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<p>
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Application programmers who are porting their GLUT programs to <i>freeglut</i> may continue
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to include <tt><GL/glut.h></tt> in their programs.
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Programs which use the <i>freeglut</i>-specific extensions to GLUT should include
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<tt><GL/freeglut.h></tt>. One possible arrangement is as follows:
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</p>
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<pre>
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#ifdef FREEGLUT
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#include <GL/freeglut.h>
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#else
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#include <GL/glut.h>
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#endif
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</pre>
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<p>
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It was initially planned to
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define <code>FREEGLUT_VERSION_2_0</code>, <code>FREEGLUT_VERSION_2_1</code>, <code>FREEGLUT_VERSION_2_2</code>,
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etc., but this was only done for <code>FREEGLUT_VERSION_2_0</code>.
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This constant still exist in current FreeGLUT releases but is
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deprecated.
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</p>
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<p>
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The <i>freeglut</i> version can be queried at runtime by calling
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glutGet(GLUT_VERSION).
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The result will be X*10000+Y*100+Z where X is the major version, Y is the
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minor version and Z is the patch level.
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</p>
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<p>
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This may be used as follows:
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</p>
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<pre>
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if (glutGet(GLUT_VERSION) < 20001) {
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printf("Sorry, you need freeglut version 2.0.1 or later to run this program.\n");
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exit(1);
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}
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</pre>
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<h2>21.4 <a name="References"></a>References</h2>
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<h2>21.5 <a name="Index"></a>Index</h2>
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