turner@vidvox.com

Is there any way to access the histogram or min/max functions included

in the gl_arb_imaging extension that is a part of opengl? This would

require rasterization, but it might still be faster than going back to

a jit.matrix to perform the histogram analysis on the CPU.

Can this be accessed through glslang through jit.gl.slab? Through an

Is there any way to access the histogram or min/max functions included
in the gl_arb_imaging extension that is a part of opengl? This would
require rasterization, but it might still be faster than going back to
a jit.matrix to perform the histogram analysis on the CPU.

Can this be accessed through glslang through jit.gl.slab? Through an
external? Thanks in advance.

gpu-based-histogram

On Feb 21, 2006, at 10:32 AM, Jack Turner wrote:

> Is there any way to access the histogram or min/max functions included

> in the gl_arb_imaging extension that is a part of opengl? This would

> require rasterization, but it might still be faster than going back to

> a jit.matrix to perform the histogram analysis on the CPU.

We don't currently expose any of the imaging extensions in Jitter, 

though a third party extern in theory should be capable of doing this 

> Can this be accessed through glslang through jit.gl.slab?

This is something of a tricky thing to implement inside a pixel 

shader. It would need to be multi-pass as a histogram in its typical 

implementation is a "scatter" algorithm rather than a "gather" 

algorithm (the latter being a requirement for stream processing). 

However, with multiple passes you can implement a gather algorithm, 

http://www.google.com/search?q=gpgpu+histogram

> Is there any way to access the histogram or min/max functions included
> in the gl_arb_imaging extension that is a part of opengl? This would
> require rasterization, but it might still be faster than going back to
> a jit.matrix to perform the histogram analysis on the CPU.

We don't currently expose any of the imaging extensions in Jitter,  
though a third party extern in theory should be capable of doing this  
if the card supports

This is something of a tricky thing to implement inside a pixel  
shader. It would need to be multi-pass as a histogram in its typical  
implementation is a "scatter" algorithm rather than a "gather"  
algorithm (the latter being a requirement for stream processing).  
However, with multiple passes you can implement a gather algorithm,  
though it will be tricky to accomplish.

this is a great idea... it would add a lot of value to jitter's GPU 

processing. i'm imagining an on-the-fly autolevels effect. very nice!

i'm officially making a feature request, since i don't currently have 

this is a great idea... it would add a lot of value to jitter's GPU  
processing. i'm imagining an on-the-fly autolevels effect. very nice!

i'm officially making a feature request, since i don't currently have  
the proper coding chops. :)

gpu-based histogram