(obtained and maintained through www.delphigl.com)
(obtained and maintained through www.delphigl.com)
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. The changelog is included in the source file itself.
OpenGL-Header is for Borland Delphi 4 and above (tested with Delphi 7) and FreePascal.
Containts the translations of glext.h, gl_1_1.h, glu.h and weglext.h.
It also contains some helperfunctions that were inspired by those found in Mike Lischke's OpenGL12.pas.
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 :
procedure MyGLInit; begin InitOpenGL; // Don't forget, or first gl-Call will result in an access violation! MyDC := GetDC(...); MyRC := CreateRenderingContext(...); ActivateRenderingContext(MyDC, MyRC); // Necessary, will also read some extension ... end;
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 :
procedure MyDeInit; begin DeactivateRenderingContext; // Deactivates the current context wglDeleteContext(myRC); ReleaseDC(Handle, myDC); end;
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) :
procedure MyGLInit; begin DC := GetDC(...); RC := CreateRenderingContextVersion(DC, [opDoubleBuffered], 4, 2, True, 32, 24, 8, 0, 0, 0); // Creates an OpenGL 4.2 forward-compatible context InitOpenGL; // Don't forget, or first gl-Call will result in an access violation! ... end;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!
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 :
English support
German support
Sascha Willems (http://www.delphigl.de)
Steffen Xonna (Lossy eX, http://www.dev-center.de)
Andrey Gruzdev for the Mac OS X patch for XE2 / FPC
Lars Middendorf
Martin Waldegger (Mars)
Nico Michaelis (Delphic) for the Linux version of the header (see here)
Benjamin Rosseaux (BeRo) for expanding the header for use with Free Pascal
And thanks to all who helps us to make the header better
This Source Code Form is subject to the terms of the Mozilla Public License,
v. 2.0. If a copy of the MPL was not distributed with this file,
You can obtain one at http://mozilla.org/MPL/2.0/.
Software distributed under the License is distributed on an
"AS IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
implied. See the License for the specific language governing
rights and limitations under the License.
Software distributed under the License is distributed on an
"AS IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
implied. See the License for the specific language governing
rights and limitations under the License.