[ANSWERED] ISF shaders to GLSL isadora

[dondiego]

Hi,

very sorry but I've try to convert ISF shaders to GLSL isadora with the instructions (https://community.troikatronix...) but don't work.

The error message is : "Cannot Process Files with multiple PASSES: /Users/dondiego/Documents/isadora/ISF2GLSL/hsf.fs"

I would like translate this : 

/*
{
"CATEGORIES" : [
"XXX"
],
"CREDIT": "",
"ISFVSN" : "2",
"INPUTS" : [
{
"NAME" : "width",
"TYPE" : "float",
"DEFAULT" : 0.25
},
{
"NAME" : "offset",
"TYPE" : "point2D",
"DEFAULT" : [
0,
0
],
"MIN" : [
0,
0
],
"MAX" : [
1,
1
]
},
{
"NAME" : "color1",
"TYPE" : "color",
"DEFAULT" : [
1,
1,
1,
1
]
},
{
"NAME" : "color2",
"TYPE" : "color",
"DEFAULT" : [
0,
0,
0,
1
]
},
{
"NAME" : "splitPos",
"TYPE" : "point2D",
"MAX" : [
1,
1
],
"DEFAULT" : [
0.5,
0.5
],
"MIN" : [
0,
0
]
}
]
}
*/
void main() {
//    determine if we are on an even or odd line
//    math goes like..
//    mod(((coord+offset) / width),2)
vec4        out_color = color2;
float        size = width * RENDERSIZE.x;
if (size == 0.0)    {
out_color = color1;
}
else if ((mod(((gl_FragCoord.x+(offset.x*RENDERSIZE.x)) / size),2.0) < 2.0 * splitPos.x)&&(mod(((gl_FragCoord.y+(offset.y*RENDERSIZE.y)) / size),2.0) > 2.0 * splitPos.y))    {
out_color = color1;
}
else if ((mod(((gl_FragCoord.x+(offset.x*RENDERSIZE.x)) / size),2.0) > 2.0 * splitPos.x)&&(mod(((gl_FragCoord.y+(offset.y*RENDERSIZE.y)) / size),2.0) < 2.0 * splitPos.y))    {
out_color = color1;
}
gl_FragColor = out_color;
}

Thanks for your help

Best

J

[DusX]

@dondiego Isadora's GLSL support doesn't allow for multi-pass shaders. So any from ShaderToy (with the filter multipass: https://www.shadertoy.com/resu...) will not work without doing some Isadora magic (breaking the shader into discrete shaders that can be fed into each other. An example exists in the forum, but I can't locate it currently )

[dondiego]

@dusx Thanks

OK. What a pity. Not being a magician, I would very much like to find this example in the forum, or is a tutorial available?

Thanks

best

J

[Woland]

@dondiego

I searched the forum for "multi-pass".

This might be the post that @DusX was remembering: https://community.troikatronix.com/topic/3618/logged-multi-pass-shaders/9?_=1685111395417

[DusX]

@woland 

nice find. I didn't search with the hyphen.

So yes, that is indeed the post I mentioned. The example file Mark posted shows how each buffer can be used in individual glsl shader actors and chained together.

[dondiego]

Thanks !

I will try !

best