[osg-users] Advice on Rendering Streaming video

[J.P. Delport]

Hi,

some code snippets:

spowers at gdrs.com wrote:
> Hey uli,
> 
> What do you mean by "getting a nice image from that is a b??ch"? Is the
> image quality reduced?
> 
> Not sure what de-bayer algorithm I'm going to use. I have the source for
> one that we have used before but I'm not sure how it will work on a
> shader.
> 
> Is there an example of an osg::PixelBufferObject being used to stream to
> an Image?? How is one attached to the image?
_VideoImage[i]->setImage(cameraImageWidth, cameraImageHeight, 1, 1, 
GL_LUMINANCE, GL_UNSIGNED_BYTE, gImage[i], osg::Image::NO_DELETE);		
_VideoImage[i]->setPixelBufferObject(new 
osg::PixelBufferObject(_VideoImage[i].get()));

> 
> Also, about the non-power of 2 textures.... can I make the texture
> scaled to the nearest power of two and just modify the texture
> coordinates on the quad? Will doing this avoid the CPU scalling of the
> texture?
I just turn the scaling on CPU off:
_VideoTexture[i]->setImage(_VideoImage[i].get());
_VideoTexture[i]->setResizeNonPowerOfTwoHint(false);

>  
> 
> -Steve

jp

>  
> 
> -----Original Message-----
> From: osg-users-bounces at lists.openscenegraph.org
> [mailto:osg-users-bounces at lists.openscenegraph.org] On Behalf Of Ulrich
> Hertlein
> Sent: Wednesday, June 25, 2008 10:19 PM
> To: OpenSceneGraph Users
> Subject: Re: [osg-users] Advice on Rendering Streaming video
> 
> spowers at gdrs.com wrote:
>> I've already set up an orthographic2D view that will look at a quad
>> which will display the texture. The shader will then convert the
> texture
>> into RGB and do the whitebalance.  I am also able to swap the texture
>> back and forth and maintain decent frame rates but the textures I'm
>> using to test are only 64x64 pixels (tank.rgba and water.rgba) and I'm
>> wondering if it would be too slow (<30fps) to use the same method for
>> 1000x1000 pixel images.
> 
> The texture bandwidth isn't likely to be a problem, keep in mind that
> bayer 
> images are only 1/3 of an RGB image of the same size.
> 
> Things to look out for is to use non-power-of-two textures or texture
> rectangles 
> to avoid CPU scaling of the image.
> 
> You'll also want to attach a osg::PixelBufferObject to the osg::Image.
> 
> Unfortunately getting a nice image from that is a b??ch and the shaders
> can get 
> complex pretty fast, the number of texture lookups is probably the most 
> expensive op.  What de-bayer algorithms are you looking at?
> 
> Cheers,
> /uli
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