[PD] pix_contrast eats up cpu power

[cyrille henry]

Roman Haefeli a écrit :
> On Fri, 2008-10-17 at 18:25 +0200, cyrille henry wrote:
>> use shader!
>> you'll have to make your own shader, but adjusting color saturation is quite easy.
>> see gem documentation/10.glsl/01.simple_texture
> 
> it doesn't seem to work on my box. no matter, what shader i load, the
> texture looks the same. when i click on one of the shader loaders, i get
> the following messages:
> 
> [pix_texture]: using mode 0: TEXTURE_2D
> linking: link 5.60519e-45 4.2039e-45
> linking: link 5.60519e-45 7.00649e-45
> 
> 
> and 
> 
> 
> [pix_texture]: using mode 1: TEXTURE_RECTANGLE
> linking: link 2.8026e-45 7.00649e-45
> linking: link 2.8026e-45 4.2039e-45
> 
> 
> 
> no change in the picture whatsoever. 

both shader are doing the same. i.e : almost nothing!
the images should only be a little bit darker than without the shader.

> 
> also the ID number is out of the range in order to be represented
> properly:
> 
> 2.8026e-45
it's not displaying correctly, but it is computed correctly.

> 
> i remember there was a discussion once about this on the gem-dev list.
> is there a fix for that?
yes, there was a bug there, but it was corrected. the value you have show that it's working.


> 
> i am on ubuntu hardy with an nvidia Quadro NVS 140M and i very much
> hoped, that i have now opengl 2.x.  glxinfo:
> 
> OpenGL version string: 2.1.2 NVIDIA 169.12
> 
> do you think, shader stuff is supposed to work on my box? if so, what
> can i do to make it work?

i'm no specialist in nvidia card, but it look like it's shader compliant.

everything else look good, so i suspect it is working.
if you change  color = color * 0.5; with : color = color * 0.1; and reload the shader, the images should be darker. (change in texture.frag)

could you also try the other examples?

Cyrille

> 
> thanks
> roman
> 
>  
> 
> 
> 		
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