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Merge code for Perlin Noise impl

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This commit is contained in:
Wojtek Figat
2025-02-12 17:21:13 +01:00
parent a982e0a111
commit 6efb015169
2 changed files with 58 additions and 111 deletions
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48
Source/Shaders/Noise.hlsl
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@@ -89,11 +89,9 @@ float3 rand3dTo3d(float3 value)
);
}
// Classic Perlin noise
float PerlinNoise(float2 p)
float PerlinNoiseImpl(float4 Pi, float4 Pf)
{
float4 Pi = floor(p.xyxy) + float4(0.0, 0.0, 1.0, 1.0);
float4 Pf = frac(p.xyxy) - float4(0.0, 0.0, 1.0, 1.0);
Pi = Mod289(Pi);
float4 ix = Pi.xzxz;
float4 iy = Pi.yyww;
@@ -129,45 +127,21 @@ float PerlinNoise(float2 p)
return saturate(2.3 * n_xy);
}
// Classic Perlin noise
float PerlinNoise(float2 p)
{
float4 Pi = floor(p.xyxy) + float4(0.0, 0.0, 1.0, 1.0);
float4 Pf = frac(p.xyxy) - float4(0.0, 0.0, 1.0, 1.0);
return PerlinNoiseImpl(Pi, Pf);
}
// Classic Perlin noise with periodic variant
float PerlinNoise(float2 p, float2 rep)
{
float4 Pi = floor(p.xyxy) + float4(0.0, 0.0, 1.0, 1.0);
float4 Pf = frac(p.xyxy) - float4(0.0, 0.0, 1.0, 1.0);
Pi = fmod(Pi, rep.xyxy);
Pi = Mod289(Pi);
float4 ix = Pi.xzxz;
float4 iy = Pi.yyww;
float4 fx = Pf.xzxz;
float4 fy = Pf.yyww;
float4 i = Permute(Permute(ix) + iy);
float4 gx = frac(i * (1.0 / 41.0)) * 2.0 - 1.0;
float4 gy = abs(gx) - 0.5;
float4 tx = floor(gx + 0.5);
gx = gx - tx;
float2 g00 = float2(gx.x, gy.x);
float2 g10 = float2(gx.y, gy.y);
float2 g01 = float2(gx.z, gy.z);
float2 g11 = float2(gx.w, gy.w);
float4 norm = TaylorInvSqrt(float4(dot(g00, g00), dot(g01, g01), dot(g10, g10), dot(g11, g11)));
g00 *= norm.x;
g01 *= norm.y;
g10 *= norm.z;
g11 *= norm.w;
float n00 = dot(g00, float2(fx.x, fy.x));
float n10 = dot(g10, float2(fx.y, fy.y));
float n01 = dot(g01, float2(fx.z, fy.z));
float n11 = dot(g11, float2(fx.w, fy.w));
float2 fade_xy = PerlinNoiseFade(Pf.xy);
float2 n_x = lerp(float2(n00, n01), float2(n10, n11), fade_xy.x);
float n_xy = lerp(n_x.x, n_x.y, fade_xy.y);
return saturate(2.3 * n_xy);
return PerlinNoiseImpl(Pi, Pf);
}
// Simplex noise