BorlandTalk.com Borland discussion newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  Re: OpenGL Problem          BorlandTalk.com Forum Index -> C++ Builder (Graphics) View previous topic :: View next topic   Author Message Nikumaru Guest Posted: Thu Jun 26, 2003 5:30 pm    Post subject: Re: OpenGL Problem Hi, Nothing happens? or some error happens? Anyway, try using a window control component which is inherited from TWinControl. How about this? Nikumaru "Matthias Knoke" <Matthias.Knoke (AT) t-online (DOT) de> wrote Quote: I have made a small open GL program that is running fine if I draw on the Canvas of a TForm. what I want is to draw in a part of the window only (for example in the canvas of a TPaintBox), but when I'm using the same code on the canvas of the Paiontbox, nothing happens. Whats wrong ? Best regards Matthias Back to top Matthias Knoke Guest Posted: Wed Jul 02, 2003 10:38 am    Post subject: Re: OpenGL Problem Thanks, but I don't know a window control that is inherited from TWinControl and has a Canvas-property to draw on it (Canvas is defined in TCustomForm). When I'm starting the program that is drawing OpenGL on the Canvas of TPaintbox nothing happens - I can see an emty grey window only, there are no error messages and nothing is displayed in the window ... Matthias "Nikumaru" <nikumaru2002 (AT) ybb (DOT) ne.jp> schrieb im Newsbeitrag news:3efb2d1c$2 (AT) newsgroups (DOT) borland.com... Quote: Hi, Nothing happens? or some error happens? Anyway, try using a window control component which is inherited from TWinControl. How about this? Nikumaru "Matthias Knoke" <Matthias.Knoke (AT) t-online (DOT) de> wrote in message news:bde4c0$vpi$03$1 (AT) news (DOT) t-online.com... I have made a small open GL program that is running fine if I draw on the Canvas of a TForm. what I want is to draw in a part of the window only (for example in the canvas of a TPaintBox), but when I'm using the same code on the canvas of the Paiontbox, nothing happens. Whats wrong ? Best regards Matthias Back to top Scott Heiman Guest Posted: Wed Jul 02, 2003 11:38 am    Post subject: Re: OpenGL Problem You will find links to several OpenGL components at the bottom of my OpenGL page. Several of them come with source code. I don't recall any that use TPaintBox, but I think that at least one uses a TPanel. Personally, I have never been happy with an OpenGL component that inherits a control that already has a TCanvas component. I created my own control from TWinControl. I used the ::GetDC and ::ReleaseDC functions to create and maintain my own device context. That way I have complete control over the device context, and complete control over how the OpenGL scene is updated. Existing controls (that inherit TCustomControl) will update the canvas every time certain windows events occur. I was never able to create a 'flicker-free' OpenGL component from an existing control. Others have, but there implementations limit the the update rate of the scene. -- Regards, Scott http://members.cox.net/scottheiman/ (a valid e-mail address can be found on my home page) Back to top Olledd Guest Posted: Mon Sep 01, 2003 2:38 pm    Post subject: Re: OpenGL Problem "Serdar ARITAN" <serdar.aritan (AT) hacettepe (DOT) edu.tr> wrote: Quote: Hi, I have created an OpenGL application with BCB5 in my old computer for 2 years ago. When I moved the application into my new computer I have got blank form. Later I have run BCB5 OpenGL demos and I have got an error message for not retrieving a handle of the display device contex (below). I wonder anybody come across this problem before. GlSkel.cpp hdc = GetDC(Handle); SetPixelFormatDescriptor(); hrc = wglCreateContext(hdc); if(hrc == NULL) ShowMessage("~ hrc == NULL"); New Computer configuration WinXP Prof. P4 3GHz GeForce4MX 440 with AGP8X Thanks Serdar You may try to change a little of your code: hdc=GetDC(TForm1->Handle); // replace TForm1 with your Form name good luck! Sincerely Olledd Quote: Back to top Alen Markov Guest Posted: Sun Nov 30, 2003 4:02 pm    Post subject: Re: OpenGL Problem Serdar, I had the same problem with my ASUS GeForce2 GTS Gfx-Card. At the beginning I was using the original ASUS Drivers provided with the card and the hrc was always NULL. Later on when I changed to the Detonator Drivers of NVidia, hrc was not null anymore... In my case it was a Problem with the Driver for my GFX-Card... Regards, Alen -- WEB: http://www.come.to/nostromo "Olledd" <Olledd (AT) yahoo (DOT) com.tw> wrote Quote: "Serdar ARITAN" <serdar.aritan (AT) hacettepe (DOT) edu.tr> wrote: Hi, I have created an OpenGL application with BCB5 in my old computer for 2 years ago. When I moved the application into my new computer I have got blank form. Later I have run BCB5 OpenGL demos and I have got an error message for not retrieving a handle of the display device contex (below). I wonder anybody come across this problem before. GlSkel.cpp hdc = GetDC(Handle); SetPixelFormatDescriptor(); hrc = wglCreateContext(hdc); if(hrc == NULL) ShowMessage("~ hrc == NULL"); New Computer configuration WinXP Prof. P4 3GHz GeForce4MX 440 with AGP8X Thanks Serdar You may try to change a little of your code: hdc=GetDC(TForm1->Handle); // replace TForm1 with your Form name good luck! 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