auvi

The documentation for jit.gl.videoplane mentions an "internal texture". It's not clear to me how the dimensions of this 

texture are set. Does it automatically size itself to the incoming matrix? OpenGL textures have square dimensions, in 

powers of 2....how is 3:4 video resized to fit?

I understand how to get things to "look right", but am just curious about what's going on behind the scenes.

The documentation for jit.gl.videoplane mentions an "internal texture". It's not clear to me how the dimensions of this 
texture are set. Does it automatically size itself to the incoming matrix? OpenGL textures have square dimensions, in 
powers of 2....how is 3:4 video resized to fit?

Thanks
Kurt
....
http://retnull.com
http://auv-i.com


jit-gl-videoplane-internal-texture

> The documentation for jit.gl.videoplane mentions an "internal 

> texture". It's not clear to me how the dimensions of this

> texture are set. Does it automatically size itself to the incoming 

> matrix? OpenGL textures have square dimensions, in

> powers of 2....how is 3:4 video resized to fit?

It is matched to the incoming matrix size. It uses the rectangular 

texture implementation (also the default for jit.gl.texture, btw). 

Power of two textures (which actually need not be square, but can be 

512x128 for example) can be used if desired (jit.gl.texture 

@rectangle 0, or the message to jit.gl.videoplane "sendtexture 

rectangle 0"). However note that all of our fragment shaders assume 

rectangular rather than power of two texture coordinates.

Hope this helps. Perhaps your question is also related to the fact 

that the plane to which the texture is mapped happens to be square by 

default? This has nothing to do with the texture dimensions.

>
> The documentation for jit.gl.videoplane mentions an "internal  
> texture". It's not clear to me how the dimensions of this
> texture are set. Does it automatically size itself to the incoming  
> matrix? OpenGL textures have square dimensions, in
> powers of 2....how is 3:4 video resized to fit?

It is matched to the incoming matrix size. It uses the rectangular  
texture implementation (also the default for jit.gl.texture, btw).  
Power of two textures (which actually need not be square, but can be  
512x128 for example) can be used if desired (jit.gl.texture  
@rectangle 0, or the message to jit.gl.videoplane "sendtexture  
rectangle 0"). However note that all of our fragment shaders assume  
rectangular rather than power of two texture coordinates.

Hope this helps. Perhaps your question is also related to the fact  
that the plane to which the texture is mapped happens to be square by  
default? This has nothing to do with the texture dimensions.

jit.gl.videoplane "internal texture"