[PD] GEM: GLSL effects

[cyrille henry]

Cypod a écrit :
> I found a webpage that has published some code for creating effects
> with glsl, and I am trying to get them to work in pd
> http://dem.ocracy.org/libero/photobooth/
> There are some other cool effects, eventually it could be a cool patch idea.
>    Do yo need a vert? 
no, we don't need a vert

>I am trying to plug this into the
> deform_texture.pd patch. So far this is the frag that I have worked
> out so far:
> 

ok, here is a corrected version of this patch.

cyrille


> 
> uniform sampler2D texture;
> 
> 
> 
> void main(void)
> {
> 	vec2 texCoord = (gl_TexCoord[0].st); // [0.0 ,1.0] x [0.0, 1.0]
> 	vec2 normCoord = 2.0 * texCoord - 1.0; // [-1.0 ,1.0] x [-1.0, 1.0]
> 
> 	normCoordNew = Effect(normCoord)
> 	rNew, phiNew = Effect(r, phi)
> 	float r = length(normCoord); // to polar coords
> 	float phi = atan(normCoord.y, normCoord.x); // to polar coords
> 
> 
> 	r = pow(r, 1.0/1.8) * 0.8
> 
> 	normCoord.x = r * cos(phi);
> 	normCoord.y = r * sin(phi);
> 	texCoord = normCoord / 2.0 + 0.5; // [0.0 ,1.0] x [0.0, 1.0]
> 	color = texture2D(sampler, texCoord);
> 	gl_FragColor = color;
> }
> 
> 
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