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@pradeepb28
Forked from realvjy/ChoasLinesShader.metal
Created May 22, 2024 15:28
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Choas Lines - Metal Shader
// Lines
float hash( float n ) {
return fract(sin(n)*753.5453123);
}
// Slight modification of iq's noise function.
float noise(vector_float2 x )
{
vector_float2 p = floor(x);
vector_float2 f = fract(x);
f = f*f*(3.0-2.0*f);
float n = p.x + p.y*157.0;
return mix(
mix( hash(n+ 0.0), hash(n+ 1.0),f.x),
mix( hash(n+157.0), hash(n+158.0),f.x),
f.y);
}
float fbm(vector_float2 p, vector_float3 a)
{
float v = 0.0;
v += noise(p*a.x)*0.50 ;
v += noise(p*a.y)*1.50 ;
v += noise(p*a.z)*0.125 * 0.1; // variable
return v;
}
vector_float3 drawLines(
vector_float2 uv,
vector_float3 fbmOffset,
vector_float3 color1,
vector_float3 colorSet[4],
float secs
)
{
float timeVal = secs * 0.1;
vector_float3 finalColor = vector_float3( 0.0 );
vector_float3 colorSets[4] = {
vector_float3(0.7, 0.05, 1.0),
vector_float3(1.0, 0.19, 0.0),
vector_float3(0.0, 1.0, 0.3),
vector_float3(0.0, 0.38, 1.0)
};
for( int i=0; i < 4; ++i )
{
float indexAsFloat = float(i);
float amp = 80.0 + (indexAsFloat*0.0);
float period = 2.0 + (indexAsFloat+2.0);
float thickness = mix( 0.4, 0.2, noise(uv*2.0) );
float t = abs( 1. /(sin(uv.y + fbm( uv + timeVal * period, fbmOffset )) * amp) * thickness );
finalColor += t * colorSets[i];
}
for( int i=0; i < 4; ++i )
{
float indexAsFloat = float(i);
float amp = 40.0 + (indexAsFloat*5.0);
float period = 9.0 + (indexAsFloat+2.0);
float thickness = mix( 0.1, 0.1, noise(uv * 12.0) );
float t = abs( 1. /(sin(uv.y + fbm( uv + timeVal * period, fbmOffset )) * amp) * thickness );
finalColor += t * colorSets[i] * color1;
}
return finalColor;
}
[[ stitchable ]] half4 timeLines(
float2 position,
half4 color,
float4 bounds,
float secs,
float tapValue
) {
vector_float2 uv = ( position / bounds.w ) * 1.0 - 1.0;
uv *= 1.0 + 0.5;
vector_float3 lineColor1 = vector_float3( 1.0, 0.0, 0.5 );
vector_float3 lineColor2 = vector_float3( 0.3, 0.5, 1.5 );
float spread = abs(tapValue);
vector_float3 finalColor = vector_float3(0);
vector_float3 colorSet[4] = {
vector_float3(0.7, 0.05, 1.0),
vector_float3(1.0, 0.19, 0.0),
vector_float3(0.0, 1.0, 0.3),
vector_float3(0.0, 0.38, 1.0)
};
float t = sin( secs ) * 0.5 + 0.5;
float pulse = mix( 0.05, 0.20, t);
finalColor = drawLines(uv, vector_float3( 65.2, 40.0, 4.0), lineColor1, colorSet, secs * 0.1) * pulse;
finalColor += drawLines( uv, vector_float3( 5.0 * spread/2, 2.1 * spread, 1.0), lineColor2, colorSet, secs );
return half4(half3(finalColor), 1.0);
}
// Usagge in view
ZStack{
TimelineView(.animation) { context in
Rectangle()
.foregroundStyle(.white)
.timeLines(seconds: context.date.timeIntervalSince1970 - self.start.timeIntervalSince1970,
tapValue: tapCount
)
}
}
// Extension
extension View {
func timeLines(seconds: Double, tapValue: CGFloat ) -> some View {
self
.colorEffect(
ShaderLibrary.default.timeLines(
.boundingRect,
.float(seconds),
.float(tapValue))
)
}
}
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