Why doesn't this Shadertoy code run?

Discussions
1

I copy this code of shadertoy page and change the code but no run…i think that i make some wrong

void main() {
     vec2 q = 0.6 * (2.0*gl_FragCoord-iResolution.xy)/min(iResolution.y,iResolution.x);
     
     float a = atan( q.x, q.y );
     float r = length( q );
     float s = 0.50001 + 0.5*sin( 3.0*a + iGlobalTime );
     float g = sin( 1.57+3.0*a+iGlobalTime );
     float d = 0.15 + 0.3*sqrt(s) + 0.15*g*g;
     float h = clamp( r/d, 0.0, 1.0 );
     float f = 1.0-smoothstep( 0.95, 1.0, h );
     
     h *= 1.0-0.5*(1.0-h)*smoothstep( 0.95+0.05*h, 1.0, sin(3.0*a+iGlobalTime) );
     
     vec3 bcol = vec3(0.9+0.1*q.y, 1.0, 0.9-0.1*q.y);
     bcol *= 1.0 - 0.5*r;
     vec3 col = mix( bcol, 1.2*vec3(0.65*h, 0.25+0.5*h, 0.0), f );
     
     gl_FragColor = vec4( col, 1.0 );
}

proba glsl.vuo (2.03 KB)

2

You need to change gl_FragCoord to gl_FragCoord.xy.

3

ohhhh!!! I love you…is very important for me this cue…now is working!!!

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