50 lines
2.0 KiB
Plaintext
50 lines
2.0 KiB
Plaintext
float2 singularitySpiral(float2 c, float time, float iterator)
|
|
{
|
|
float radiusSq = max(dot(c, c), 0.0001);
|
|
float angle = 0.5 * log(radiusSq) + time * iterator;
|
|
return float2(
|
|
c.x * cos(angle + 0.0) + c.y * cos(angle + 11.0),
|
|
c.x * cos(angle + 33.0) + c.y * cos(angle + 0.0)) / max(iterator, 0.001);
|
|
}
|
|
|
|
float4 shadeVideo(ShaderContext context)
|
|
{
|
|
float2 resolution = max(context.outputResolution, float2(1.0, 1.0));
|
|
float2 fragCoord = context.uv * resolution;
|
|
float safeScale = max(scale, 0.001);
|
|
float safeRingRadius = max(ringRadius, 0.001);
|
|
float safeTightness = max(tightness, 0.001);
|
|
float seed = context.startupRandom;
|
|
float time = context.time * speed + seed * 37.0;
|
|
|
|
float2 p = (fragCoord + fragCoord - resolution) / resolution.y / safeScale;
|
|
p -= center + float2(sin(seed * 6.2831853), cos(seed * 6.2831853)) * 0.035;
|
|
|
|
float iterator = 0.2;
|
|
float2 diagonal = normalize(float2(-1.0 + seed * 0.5, 1.0 - seed * 0.35));
|
|
float2 blackholeCenter = p - iterator * diagonal;
|
|
float gravity = iterator * strength / max(dot(blackholeCenter, blackholeCenter), 0.0001);
|
|
float2 skew = diagonal / (0.1 + gravity);
|
|
|
|
float2 c = float2(p.x + p.y, p.x * skew.x + p.y * skew.y);
|
|
float2 v = singularitySpiral(c, time, iterator);
|
|
float2 waves = float2(0.0001, 0.0001);
|
|
|
|
for (; iterator < 9.0; iterator += 1.0)
|
|
{
|
|
waves += 1.0 + sin(v);
|
|
v += 0.7 * sin(v.yx * iterator + time) / iterator + 0.5;
|
|
}
|
|
|
|
float diskRadius = length(sin(v / 0.3) * 0.4 + c * float2(2.0, 4.0));
|
|
float disk = 2.0 + diskRadius * diskRadius * (0.25 * safeTightness) - diskRadius;
|
|
float centerDarkness = 0.5 + 1.0 / max(dot(c, c), 0.0001);
|
|
float rim = 0.025 + abs(length(p) - safeRingRadius) * safeTightness;
|
|
float4 redBlueGradient = exp(c.x * float4(0.6, -0.4, -1.0, 0.0) * colorShift);
|
|
float4 waveColor = waves.xyyx;
|
|
|
|
float4 color = 1.0 - exp(-redBlueGradient / max(waveColor, float4(0.0001, 0.0001, 0.0001, 0.0001)) / disk / centerDarkness / rim * brightness);
|
|
color.a = 1.0;
|
|
return saturate(lerp(color, context.sourceColor, sourceMix));
|
|
}
|