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88 行
3.1 KiB
88 行
3.1 KiB
using System.Reflection;
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using UnityEngine;
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namespace UnityEditor.ShaderGraph
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{
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[Title("Procedural", "Noise", "Simple Noise")]
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class NoiseNode : CodeFunctionNode
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{
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public NoiseNode()
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{
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name = "Simple Noise";
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}
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protected override MethodInfo GetFunctionToConvert()
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{
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return GetType().GetMethod("Unity_SimpleNoise", BindingFlags.Static | BindingFlags.NonPublic);
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}
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static string Unity_SimpleNoise(
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[Slot(0, Binding.MeshUV0)] Vector2 UV,
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[Slot(1, Binding.None, 500f, 500f, 500f, 500f)] Vector1 Scale,
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[Slot(2, Binding.None)] out Vector1 Out)
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{
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return
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@"
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{
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$precision t = 0.0;
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$precision freq = pow(2.0, $precision(0));
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$precision amp = pow(0.5, $precision(3-0));
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t += Unity_SimpleNoise_ValueNoise_$precision($precision2(UV.x*Scale/freq, UV.y*Scale/freq))*amp;
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freq = pow(2.0, $precision(1));
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amp = pow(0.5, $precision(3-1));
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t += Unity_SimpleNoise_ValueNoise_$precision($precision2(UV.x*Scale/freq, UV.y*Scale/freq))*amp;
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freq = pow(2.0, $precision(2));
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amp = pow(0.5, $precision(3-2));
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t += Unity_SimpleNoise_ValueNoise_$precision($precision2(UV.x*Scale/freq, UV.y*Scale/freq))*amp;
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Out = t;
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}
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";
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}
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public override void GenerateNodeFunction(FunctionRegistry registry, GraphContext graphContext, GenerationMode generationMode)
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{
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registry.ProvideFunction($"Unity_SimpleNoise_RandomValue_{concretePrecision.ToShaderString()}", s => s.Append(@"
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inline $precision Unity_SimpleNoise_RandomValue_$precision ($precision2 uv)
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{
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return frac(sin(dot(uv, $precision2(12.9898, 78.233)))*43758.5453);
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}"));
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registry.ProvideFunction($"Unity_SimpleNnoise_Interpolate_{concretePrecision.ToShaderString()}", s => s.Append(@"
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inline $precision Unity_SimpleNnoise_Interpolate_$precision ($precision a, $precision b, $precision t)
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{
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return (1.0-t)*a + (t*b);
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}
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"));
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registry.ProvideFunction($"Unity_SimpleNoise_ValueNoise_{concretePrecision.ToShaderString()}", s => s.Append(@"
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inline $precision Unity_SimpleNoise_ValueNoise_$precision ($precision2 uv)
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{
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$precision2 i = floor(uv);
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$precision2 f = frac(uv);
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f = f * f * (3.0 - 2.0 * f);
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uv = abs(frac(uv) - 0.5);
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$precision2 c0 = i + $precision2(0.0, 0.0);
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$precision2 c1 = i + $precision2(1.0, 0.0);
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$precision2 c2 = i + $precision2(0.0, 1.0);
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$precision2 c3 = i + $precision2(1.0, 1.0);
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$precision r0 = Unity_SimpleNoise_RandomValue_$precision(c0);
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$precision r1 = Unity_SimpleNoise_RandomValue_$precision(c1);
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$precision r2 = Unity_SimpleNoise_RandomValue_$precision(c2);
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$precision r3 = Unity_SimpleNoise_RandomValue_$precision(c3);
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$precision bottomOfGrid = Unity_SimpleNnoise_Interpolate_$precision(r0, r1, f.x);
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$precision topOfGrid = Unity_SimpleNnoise_Interpolate_$precision(r2, r3, f.x);
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$precision t = Unity_SimpleNnoise_Interpolate_$precision(bottomOfGrid, topOfGrid, f.y);
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return t;
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}"));
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base.GenerateNodeFunction(registry, graphContext, generationMode);
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}
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}
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}
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