Added new shaders

shaders/singularity/shader.json

@@ -0,0 +1,90 @@
+{
+  "id": "singularity",
+  "name": "Singularity",
+  "description": "Whirling blackhole and accretion disk. Original by XorDev, adapted from https://www.shadertoy.com/view/3csSWB.",
+  "category": "Generative",
+  "entryPoint": "shadeVideo",
+  "parameters": [
+    {
+      "id": "speed",
+      "label": "Speed",
+      "type": "float",
+      "default": 1.0,
+      "min": 0.0,
+      "max": 4.0,
+      "step": 0.01
+    },
+    {
+      "id": "scale",
+      "label": "Scale",
+      "type": "float",
+      "default": 0.7,
+      "min": 0.25,
+      "max": 1.5,
+      "step": 0.01
+    },
+    {
+      "id": "strength",
+      "label": "Gravity",
+      "type": "float",
+      "default": 1.0,
+      "min": 0.1,
+      "max": 3.0,
+      "step": 0.01
+    },
+    {
+      "id": "ringRadius",
+      "label": "Ring Radius",
+      "type": "float",
+      "default": 0.7,
+      "min": 0.2,
+      "max": 1.4,
+      "step": 0.01
+    },
+    {
+      "id": "tightness",
+      "label": "Tightness",
+      "type": "float",
+      "default": 1.35,
+      "min": 0.5,
+      "max": 3.0,
+      "step": 0.01
+    },
+    {
+      "id": "brightness",
+      "label": "Brightness",
+      "type": "float",
+      "default": 1.0,
+      "min": 0.1,
+      "max": 4.0,
+      "step": 0.01
+    },
+    {
+      "id": "colorShift",
+      "label": "Color Shift",
+      "type": "float",
+      "default": 1.0,
+      "min": -2.0,
+      "max": 2.0,
+      "step": 0.01
+    },
+    {
+      "id": "center",
+      "label": "Center",
+      "type": "vec2",
+      "default": [0.0, 0.0],
+      "min": [-1.0, -1.0],
+      "max": [1.0, 1.0],
+      "step": [0.001, 0.001]
+    },
+    {
+      "id": "sourceMix",
+      "label": "Source Mix",
+      "type": "float",
+      "default": 0.0,
+      "min": 0.0,
+      "max": 1.0,
+      "step": 0.01
+    }
+  ]
+}

shaders/singularity/shader.slang

@@ -0,0 +1,48 @@
+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 time = context.time * speed;
+
+	float2 p = (fragCoord + fragCoord - resolution) / resolution.y / safeScale;
+	p -= center;
+
+	float iterator = 0.2;
+	float2 diagonal = float2(-1.0, 1.0);
+	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));
+}