[GEM-dev] vertex displacement

[marius schebella]

hello cyrille,
I did not know that this was possible at all. I always thought there are 
only 4 vertices involved in the primitive and now I see that it is 
possible to do displacement on pixel basis.
I tested the patch and on my system (osx, ATY,RadeonX1600) I can use
A 0, C 0, K 1 (B 1 or 0 does not make a difference)
A 1, C 1, K 1 (B - no difference)
and also your combinations with 256, 0.00390625.
so for me it works just fine.
the differences may be related to different hardware/os.
I also don't need the line
#extension GL_ARB_texture_rectangle : enable
what do you mean with "using texture in vertex shader would be great..."
do you think this should work without gemframebuffer?
marius.

cyrille henry wrote:
> hello,
> 
> i investigate a bit more the vertex displacement problem.
> so i've got a 8 bit texture that is rendered in a FLOAT framebuffer, in 
> order to convert it to 32 bit.
> then, the frambuffer texture is used in a shader to distord a primitive
> 
> i have to strangely mix mode 0 and mode 1 in the patch to make it work, 
> and this is very ineficient (just like in 8bit mode).
> 
> framebuffer and fragment shader usually work in mode 0 and 1 on my 
> computer.
> 
> see patch for more.
> 
> thanks to have a look.
> using texture in vertex shader would be great...
> 
> thanks
> Cyrille
> 
> 
> 
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