KillingFrenzy

I'm swapping in a new alpha channel, and wondering if there is a more efficient method than the following. I'm able to get a nice 30fps with 10 objects receiving 320x240 video "streams" but when I throw in this alpha map swap step, it kills the framerate. Is there a way to do an op command that just performs the function on a single plane? I feel like I'm missing something very obvious.

I'm swapping in a new alpha channel, and wondering if there is a more efficient method than the following.  I'm able to get a nice 30fps with 10 objects receiving 320x240 video "streams" but when I throw in this alpha map swap step, it kills the framerate.  Is there a way to do an op command that just performs the function on a single plane?  I feel like I'm missing something very obvious.

alpha-substitution

On Aug 28, 2006, at 3:37 PM, Leo Mayberry wrote:

> I'm swapping in a new alpha channel, and wondering if there is a 

> more efficient method than the following. I'm able to get a nice 

> 30fps with 10 objects receiving 320x240 video "streams" but when I 

> throw in this alpha map swap step, it kills the framerate. Is 

> there a way to do an op command that just performs the function on 

> a single plane? I feel like I'm missing something very obvious.

I might suggest using multi-texturing for your purposes. At bottom is 

a simple example patch. You only need to load the mask texture once 

to the graphics card. This is also useful for adding masks to UYVY 

Another option would be to use jit.gl.slab with something like the 

cc.alphaglue.jxs example shader to glue the alpha channel from one 

texture resource to another texture resource on the GPU. This is 

probably only an advantage over teh multi-texturing approach if you 

want to perform additional processing of the texture with other 

>
> I'm swapping in a new alpha channel, and wondering if there is a  
> more efficient method than the following.  I'm able to get a nice  
> 30fps with 10 objects receiving 320x240 video "streams" but when I  
> throw in this alpha map swap step, it kills the framerate.  Is  
> there a way to do an op command that just performs the function on  
> a single plane?  I feel like I'm missing something very obvious.

I might suggest using multi-texturing for your purposes. At bottom is  
a simple example patch. You only need to load the mask texture once  
to the graphics card. This is also useful for adding masks to UYVY  
textures.

Another option would be to use jit.gl.slab with something like the  
cc.alphaglue.jxs example shader to glue the alpha channel from one  
texture resource to another texture resource on the GPU. This is  
probably only an advantage over teh multi-texturing approach if you  
want to perform additional processing of the texture with other  
instances of jit.gl.slab.

i think there is a typo, line 7 should be

to add, why am i getting grey (should be white) in this patch

You need to add a call to glcolor in yourt sketch commands

glcolor 1. 1. 1. 1. added to the cmdlist got it.

Alpha substitution