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[Manta] Re: Re: Re: Dynamically changing rendering stack?


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  • From: Abe Stephens < >
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  • Subject: [Manta] Re: Re: Re: Dynamically changing rendering stack?
  • Date: Thu, 18 Sep 2008 15:58:04 -0600
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On Sep 18, 2008, at 3:45 PM, Li-Ta Lo wrote:

On Thu, 2008-09-18 at 15:24 -0600, Abe Stephens wrote:
Yes, just make the change in a transaction.


Do you mean putting Factory::selectShadowAlgorithm() in a transaction?

That's one way, but you can also just use the accessors in MantaInterface. I use a combination of the factory for the standard components, and explicit construction for my custom components:

engine = manta_new(createManta());
engine.changeNumWorkers( num_workers );

factory = Factory( engine )
factory.selectLoadBalancer   ("workqueue")

# Initialize image traverser.
traverser = manta_new( TSARImageTraverser( 64 ) );
engine.setImageTraverser( traverser );



Why does (only) Factory::selectImageType() has its own callback?

Image framebuffers in Manta are created by a callback when the engine is running. When you send Manta a changeResolution transaction, it deletes the old images, and then uses the callback to create new images at the new resolution. Usually this callback just invokes the image class constructor with the new resolution, but in some cases it might do something special (like if the frame buffer size was different than the renderer's resolution).

Images are the only modular component that is created on demand by the engine--the other components can be created before the engine is started, or updated and changed during transactions when the engine is effectively paused.

Abe




bool Factory::selectImageType(const string& spec) const
{
 string name;
 vector<string> args;
 parseSpec(spec, name, args);

 ImageCreatorMapType::const_iterator iter = imageCreators.find(name);
 if(iter == imageCreators.end())
   return 0;

 ImageCreator creator = iter->second;

 // Create a static method callback.
manta_interface- > setCreateImageCallback ( Callback::create( &Factory::createImageCallback,
                                                            creator,
                                                            args ) );

 return true;
}

void Factory::createImageCallback( bool stereo, int xres, int yres,
Image *& image, ImageCreator creator, vector<string> args ) {

 // Invoke the legacy image creator.
 image = (creator)(args, stereo, xres, yres);
}

Ollie




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