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clayasaurus
Joined: 21 May 2004
Posts: 857
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 Posted: Sat Aug 06, 2005 7:54 am Post subject: SDL_UpdateRect crash |
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does anyone else get an 'Access Violation' when they try to call SDL_UpdateRect? I'm new to windows so I'm not really sure what type of problem this is, I assume it is something to do with modifying memory I'm not supposed to be modifying? I know it is not derelict otherwise I would get an exception error message.
The reason I'm trying to call this function is because I read this GD.net post...
| GD.net wrote: |
To resize the window without having it die, you'll need to use
SDL_UpdateRect(). By all logical reasoning, this shouldn't be
necessary, but it's the only way I've been able to get SDL to resize
the window and not kill itself in the process. Here's a quick snipped
of code to show you how it's meant to be used:
SDL_Event event;
//get the event here
switch (event.type){
case SDL_VIDEORESIZE:
SDL_UpdateRect(mySDLSurface,0,0,0,0);
glViewport(0,0,event.resize.w,event.resize.h);
break;
}
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When I resize my SDL window, I lose my all OpenGL textures.
Appreciate any help, thanks. |
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aldacron
Joined: 05 May 2004
Posts: 1322
Location: Seoul, South Korea
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| Posted: Sat Aug 06, 2005 10:17 am Post subject: Re: SDL_UpdateRect crash |
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| clayasaurus wrote: | does anyone else get an 'Access Violation' when they try to call SDL_UpdateRect? I'm new to windows so I'm not really sure what type of problem this is, I assume it is something to do with modifying memory I'm not supposed to be modifying? I know it is not derelict otherwise I would get an exception error message.
The reason I'm trying to call this function is because I read this GD.net post...
| GD.net wrote: |
To resize the window without having it die, you'll need to use
SDL_UpdateRect(). By all logical reasoning, this shouldn't be
necessary, but it's the only way I've been able to get SDL to resize
the window and not kill itself in the process. Here's a quick snipped
of code to show you how it's meant to be used:
SDL_Event event;
//get the event here
switch (event.type){
case SDL_VIDEORESIZE:
SDL_UpdateRect(mySDLSurface,0,0,0,0);
glViewport(0,0,event.resize.w,event.resize.h);
break;
}
|
When I resize my SDL window, I lose my all OpenGL textures.
Appreciate any help, thanks. |
I'm confused - is the access violation happening when you call SDL_UpdateRect, or is it happening later as a result of calling it?
If the former, make sure the surface pointer you pass in is a valid one.
As for losing the textures, I'm not sure what's going on. I know that on Windows when you recreate a window, you have to also destroy and recreate the OpenGL context, which in turn means you lose all of your current state and other data. But that shouldn't be happening as a result of resizing. SDL must be doing something really weird under the hood.
So, exactly when does the access violation occurr? |
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