Re: Problem with shadow render opengl

[James W. W. <os...@jw...>]

On Sep 13, 2007, at 3:42 AM, Daniele Cavallini wrote:

> I try so:
> drawContextDisplay is a TQ3DrawContextObject global variable
>
>         TQ3AcceleratedOffscreenPropertyData propData;
>         myStatus = Q3View_GetDrawContext
> (gDocumento3D.fView,&drawContextDisplay); // I get the drawcontext  
> display
>         myDrawContext = MyNewDrawContext(lar,alt);// I create the  
> Pixmap
> drawcontext (TQ3PixmapDrawContextData)
>         propData.masterDrawContext=drawContextDisplay;
>         propData.copyFromPixmapAtFrameStart=kQ3False;
>         propData.copyToPixmapAtFrameEnd=kQ3False;
>
>         myStatus =    Q3Object_SetProperty(myDrawContext,
> kQ3DrawContextPropertyAcceleratedOffscreen,sizeof(propData),  
> &propData );
>         myStatus=Q3View_SetDrawContext 
> (gDocumento3D.fView,myDrawContext);
>
>
> Do you think it is a correct operation?
> The variable  myStatus is always True but when I call
> Q3View_StartRendering program crash.

I think you probably want to set propData.copyToPixmapAtFrameEnd to  
kQ3True, if you want to see a rendered image in the Pixmap.  You  
would only set propData.copyToPixmapAtFrameEnd to kQ3False if you  
want to get the image in some other way such as using glReadPixels.

When you replace drawContextDisplay with myDrawContext as the draw  
context associated with the view gDocumento3D.fView, it probably  
means that drawContextDisplay is no longer a valid draw context, so  
it is not a good value for propData.masterDrawContext.  When I have  
used kQ3DrawContextPropertyAcceleratedOffscreen, I used different  
view objects for the PixMap draw context and the on-screen master  
draw context.

>
> James W. Walker ha scritto:
>> On Sep 11, 2007, at 2:35 AM, Daniele Cavallini wrote:
>>
>>
>>> You are right in Mac there is not problem.
>>> I work with a imac intel  core due with video card  ATI Radeon x1600
>>> I can well compare mac os x and windows xp.
>>>
>>> I tried to use kQ3DrawContextPropertyAcceleratedOffscreen:
>>>
>>> TQ3Boolean    theFlag = kQ3True;
>>> Q3Object_SetProperty( fRenderer, kQ3RendererPropertyShadows,sizeof
>>> (theFlag), &theFlag );
>>> Q3Object_SetProperty( fRenderer,
>>> kQ3DrawContextPropertyAcceleratedOffscreen,sizeof(theFlag),
>>> &theFlag );
>>>
>>>
>>> but without success.
>>>
>>
>> kQ3DrawContextPropertyAcceleratedOffscreen is a property that must be
>> set on the draw context, not the renderer.  That's why it's called a
>> draw context property.  Also, the value is not a TQ3Boolean.  See the
>> documentation in QuesaDrawContext.h.
>>
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