62 lines
1.8 KiB
Plaintext
62 lines
1.8 KiB
Plaintext
float happyNoise(float2 p)
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{
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return frac(dot(p, sin(p))) - 0.5;
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}
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float2x2 rotateAroundZ(float angle)
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{
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float c = cos(angle);
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float s = sin(angle);
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return float2x2(c, s, -s, c);
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}
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float2x2 happyAccidentMatrix(float3 originalPosition, float timeCos)
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{
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return float2x2(
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cos(originalPosition.x),
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sin(originalPosition.y),
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-sin(originalPosition.z),
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timeCos);
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}
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float4 shadeVideo(ShaderContext context)
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{
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float2 resolution = max(context.outputResolution, float2(1.0, 1.0));
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float2 fragCoord = context.uv * resolution;
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float2 normalizedCoord = (fragCoord - 0.5 * resolution) / resolution.y / max(scale, 0.001);
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float time = context.time * speed;
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float timeCos = cos(0.1 * time);
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float3 direction = normalize(float3(normalizedCoord, 1.0));
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float3 origin = float3(0.0, 0.0, time);
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float z = happyNoise(fragCoord);
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float distanceToSurface = 0.0;
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float4 accumulated = float4(0.0, 0.0, 0.0, 0.0);
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float clampedSteps = clamp(raySteps, 1.0, 77.0);
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for (int i = 0; i < 77; ++i)
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{
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if (float(i) >= clampedSteps)
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break;
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z += 0.6 * distanceToSurface;
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float3 position = origin + z * direction;
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float3 originalPosition = position;
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position.xy = mul(rotateAroundZ(2.0 + originalPosition.z), position.xy);
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position.xy = mul(happyAccidentMatrix(originalPosition, timeCos), position.xy);
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float colorSeed = 0.5 * originalPosition.z + length(position - originalPosition);
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float4 palette = 1.0 + sin(colorSeed + float4(0.0, 4.0, 3.0, 6.0));
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palette /= 0.5 + 2.0 * dot(originalPosition.xy, originalPosition.xy);
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position = abs(frac(position) - 0.5);
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distanceToSurface = abs(min(length(position.xy) - 0.125, min(position.x, position.y) + 0.001)) + 0.001;
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accumulated += palette.w * palette / distanceToSurface;
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}
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float4 color = float4(tanh((accumulated.rgb * intensity) / 20000.0), 1.0);
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return saturate(lerp(color, context.sourceColor, sourceMix));
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}
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