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OpenGL/dglOpenGL.html
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OpenGL/dglOpenGL.html
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
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"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="de" >
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<head>
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<title>Delphi/Free Pascal OpenGL Community - OpenGL Header</title>
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<style type="text/css" media="all">
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<!--
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body {
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color: #000000;
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background: #FFFFFF;
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font-family: lucida sans, sans, verdana, tahoma;
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font-size: 12px;
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margin: 10px;
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}
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#content {
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margin: 0 0 0 10px;
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}
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#content pre {
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font-family: monospace;
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font-size: 90%;
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color: #000000;
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background: #F7F7F7;
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border-width: 1px;
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border-color: #AAAAAA;
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border-style: solid;
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margin-left: 15px;
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padding-left: 3px;
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}
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#content p {
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margin: 0 0 10px 15px;
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}
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#content ul {
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margin-top: 0;
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margin-bottom: 0;
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}
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h1 {
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margin: 0 0 5px;
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font-size: 195%;
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font-weight: bold;
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}
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h2 {
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margin: 15px 0 5px;
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font-size: 125%;
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border-bottom: 1px solid #888;
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}
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h3 {
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font-style: italic;
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margin: 5px 0 5px;
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font-size: 100%;
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}
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-->
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</style>
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</head>
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<body>
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<div id="header">
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<h1>Delphi/Free Pascal OpenGL Header for OpenGL 4.4a - Readme -</h1>
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<div id="content">
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<p>(obtained and maintained through <a href="http://www.delphigl.com" target="_blank">www.delphigl.com</a>)</p>
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</div>
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</div>
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<div id="content">
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<h2>Content</h2>
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<p><a href="#desc">Description</a><br>
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<a href="#howto">How to use</a><br>
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<a href="#support">Support</a><br>
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<a href="#credits">Credits</a><br>
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<a href="#copyright">Copyright</a><br></p>
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</div>
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<div id="content">
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<a name="desc" />
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<h2>Description</h2>
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<p>This is the readme for the OpenGL-Headers for Delphi/FreePascal that has been developed by DGL's OpenGL2.0-Portteam. Please read carefully through this file before using the header to avoid common problems and faults.
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The changelog is included in the source file itself.
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</p>
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</p>
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</div>
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<div id="content">
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<h2>Note</h2>
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<p>OpenGL-Header is for Borland Delphi 4 and above (tested with Delphi 7) and FreePascal.<br />
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Containts the translations of glext.h, gl_1_1.h, glu.h and weglext.h.<br />
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It also contains some helperfunctions that were inspired by those found in Mike Lischke's OpenGL12.pas.</p>
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</div>
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<div id="content">
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<a name="howto" />
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<h2>How to use</h2>
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<p>Before you can use any of the gl-functions contained in the header, you'll have to call InitOpenGL to initialize the functionpointers. In your app it should look something like that :</p>
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<pre id="code">
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procedure MyGLInit;
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begin
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InitOpenGL; // Don't forget, or first gl-Call will result in an access violation!
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MyDC := GetDC(...);
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MyRC := CreateRenderingContext(...);
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ActivateRenderingContext(MyDC, MyRC); // Necessary, will also read some extension
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...
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end;</pre>
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<p>After doing the above initialisation, you're ready to use all OpenGL-Functions and extensions your card supports. And also don't forget to release your context properly when exiting :</p>
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<pre id="code">
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procedure MyDeInit;
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begin
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DeactivateRenderingContext; // Deactivates the current context
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wglDeleteContext(myRC);
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ReleaseDC(Handle, myDC);
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end;</pre>
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</div>
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<div id="content">
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<a name="howto" />
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<h2>Creating a versioned rendering context</h2>
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<p>As of OpenGL version 4.4, the header offers an additional way of creating a rendercontext, that allows for setting the desired OpenGL version and (if applicable) wether to create a forward compatible context (see OpenGL man pages on what that means) :
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<pre id="code">
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procedure MyGLInit;
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begin
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DC := GetDC(...);
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RC := CreateRenderingContextVersion(DC, [opDoubleBuffered], 4, 2, True, 32, 24, 8, 0, 0, 0); // Creates an OpenGL 4.2 forward-compatible context
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InitOpenGL; // Don't forget, or first gl-Call will result in an access violation!
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...
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end;</pre>
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Only use this method of creating a rendering context if you're sure what you're doing. Trying to create a versioned rendering context that's not supported by the target OpenGL implementation may fail!
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</p>
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</div>
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<div id="content">
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<a name="support" />
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<h2>Support</h2>
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<p>If you have problems, want to ask a question or think you may have encountered a bug in the header, please feel free to use the support-threads in our forums :<br />
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<a href="http://www.delphigl.com/forum/viewtopic.php?t=2207" target="_blank">English support</a><br />
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<a href="http://www.delphigl.com/forum/viewtopic.php?t=1863" target="_blank">German support</a></p>
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</div>
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<div id="content">
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<a name="credits" />
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<h2>Credits</h2>
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<div id="content">
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<p><h3>Converted and maintained by DGL's GL2.0-Team :</h3>
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<p>Sascha Willems (<a href="http://www.delphigl.de" target="_blank">http://www.delphigl.de</a>)<br>
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Steffen Xonna (Lossy eX, <a href="http://www.dev-center.de" target="_blank">http://www.dev-center.de</a>)<br>
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</p>
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<h3>Additional input :</h3>
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<p> Andrey Gruzdev for the Mac OS X patch for XE2 / FPC
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Lars Middendorf
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Martin Waldegger (Mars)<br>
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Nico Michaelis (Delphic) for the Linux version of the header (<a href="http://www.delphigl.com/forum/viewtopic.php?t=2577" target="_blank">see here</a>)<br>
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Benjamin Rosseaux (BeRo) for expanding the header for use with Free Pascal<br>
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And thanks to all who helps us to make the header better</p></p>
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</div>
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</div>
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<div id="content">
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<a name="copyright" />
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<h2>Copyright</h2>
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<p>The contents of this file are used with permission, subject to<br>
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the Mozilla Public License Version 1.1 (the "License"); you may<br>
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not use this file except in compliance with the License. You may<br>
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obtain a copy of the License at<br>
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<a href="http://www.mozilla.org/MPL/MPL-1.1.html" target="_blank">http://www.mozilla.org/MPL/MPL-1.1.html</a></p>
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<p>Software distributed under the License is distributed on an<br>
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"AS IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or<br>
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implied. See the License for the specific language governing<br>
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rights and limitations under the License.</p>
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</div>
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<div id="content">
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Copyright © 2003-2014 DGL-OpenGL-Portteam - All Rights Reserved
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</div>
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</div>
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</body>
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</html>
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