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Add new **Noise** library for C++/C#/VisualScript/HLSL utilities

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This commit is contained in:
Wojtek Figat
2022-07-31 22:20:38 +02:00
parent 1fdc43699c
commit 2104dbc682
10 changed files with 786 additions and 131 deletions
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63
Content/Editor/MaterialTemplates/GPUParticles.shader
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@@ -5,6 +5,7 @@
#include "./Flax/Common.hlsl"
#include "./Flax/GBufferCommon.hlsl"
#include "./Flax/Matrix.hlsl"
#include "./Flax/Noise.hlsl"
@7
// Primary constant buffer
META_CB_BEGIN(0, Data)
@@ -62,68 +63,6 @@ float Rand(inout uint seed)
return asfloat((seed >> 9) | 0x3f800000) - 1.0f;
}
float4 Mod289(float4 x)
{
return x - floor(x * (1.0 / 289.0)) * 289.0;
}
float4 Perm(float4 x)
{
return Mod289(((x * 34.0) + 1.0) * x);
}
float Noise(float3 p)
{
float3 a = floor(p);
float3 d = p - a;
d = d * d * (3.0 - 2.0 * d);
float4 b = a.xxyy + float4(0.0, 1.0, 0.0, 1.0);
float4 k1 = Perm(b.xyxy);
float4 k2 = Perm(k1.xyxy + b.zzww);
float4 c = k2 + a.zzzz;
float4 k3 = Perm(c);
float4 k4 = Perm(c + 1.0);
float4 o1 = frac(k3 * (1.0 / 41.0));
float4 o2 = frac(k4 * (1.0 / 41.0));
float4 o3 = o2 * d.z + o1 * (1.0 - d.z);
float2 o4 = o3.yw * d.x + o3.xz * (1.0 - d.x);
return o4.y * d.y + o4.x * (1.0 - d.y);
}
float3 Noise3D(float3 p)
{
float o = Noise(p);
float a = Noise(p + float3(0.0001f, 0.0f, 0.0f));
float b = Noise(p + float3(0.0f, 0.0001f, 0.0f));
float c = Noise(p + float3(0.0f, 0.0f, 0.0001f));
float3 grad = float3(o - a, o - b, o - c);
float3 other = abs(grad.zxy);
return normalize(cross(grad,other));
}
float3 Noise3D(float3 position, int octaves, float roughness)
{
float weight = 0.0f;
float3 noise = float3(0.0, 0.0, 0.0);
float scale = 1.0f;
for (int i = 0; i < octaves; i++)
{
float curWeight = pow((1.0-((float)i / octaves)), lerp(2.0, 0.2, roughness));
noise += Noise3D(position * scale) * curWeight;
weight += curWeight;
scale *= 1.72531;
}
return noise / weight;
}
// Reprojects the world space position from the given UV and raw device depth
float3 ReprojectPosition(float2 uv, float rawDepth)
{