56 lines
2.4 KiB
HLSL
56 lines
2.4 KiB
HLSL
|
#ifndef CLOUD_NOISE_INCLUDED
|
||
|
|
#define CLOUD_NOISE_INCLUDED
|
||
|
|
|
||
|
|
#include "SimplexNoise3D.hlsl"
|
||
|
|
|
||
|
|
void CloudNoise_half(float2 UV, float Scale, float VerticalSpeed, float2 Step, float Coverage, float Time, out float Sample)
|
||
|
|
{
|
||
|
|
// FBX Calculations (Lacunarity, Octaves, Amplitude)
|
||
|
|
float n = snoise(float3(UV * Scale, Time * VerticalSpeed));
|
||
|
|
n += 0.5 * snoise(float3((UV * 2.0 - Step) * Scale, Time * VerticalSpeed));
|
||
|
|
n += 0.25 * snoise(float3((UV * 4.0 - 2.0 * Step) * Scale, Time * VerticalSpeed));
|
||
|
|
n += 0.125 * snoise(float3((UV * 8.0 - 3.0 * Step) * Scale, Time * VerticalSpeed));
|
||
|
|
n += 0.0625 * snoise(float3((UV * 16.0 - 4.0 * Step) * Scale, Time * VerticalSpeed));
|
||
|
|
n += 0.03125 * snoise(float3((UV * 32.0 - 5.0 * Step) * Scale, Time * VerticalSpeed));
|
||
|
|
|
||
|
|
Sample = Coverage + 0.5 * n;
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
void CloudNoise_float(float2 UV, float Scale, float VerticalSpeed, float2 Step, float Coverage, float Time, out float Sample)
|
||
|
|
{
|
||
|
|
// FBX Calculations (Lacunarity, Octaves, Amplitude)
|
||
|
|
float n = snoise(float3(UV * Scale, Time * VerticalSpeed));
|
||
|
|
n += 0.5 * snoise(float3((UV * 2.0 - Step) * Scale, Time * VerticalSpeed));
|
||
|
|
n += 0.25 * snoise(float3((UV * 4.0 - 2.0 * Step) * Scale, Time * VerticalSpeed));
|
||
|
|
n += 0.125 * snoise(float3((UV * 8.0 - 3.0 * Step) * Scale, Time * VerticalSpeed));
|
||
|
|
n += 0.0625 * snoise(float3((UV * 16.0 - 4.0 * Step) * Scale, Time * VerticalSpeed));
|
||
|
|
n += 0.03125 * snoise(float3((UV * 32.0 - 5.0 * Step) * Scale, Time * VerticalSpeed));
|
||
|
|
|
||
|
|
Sample = Coverage + 0.5 * n;
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
void FastCloudNoise(float2 UV, float Scale, float VerticalSpeed, float2 Step, float Coverage, float Time, out float Sample)
|
||
|
|
{
|
||
|
|
// FBX Calculations (Lacunarity, Octaves, Amplitude)
|
||
|
|
float n = snoise(float3(UV * Scale, Time * VerticalSpeed));
|
||
|
|
n += 0.5 * snoise(float3((UV * 2.0 - Step) * Scale, Time * VerticalSpeed));
|
||
|
|
n += 0.25 * snoise(float3((UV * 4.0 - 2.0 * Step) * Scale, Time * VerticalSpeed));
|
||
|
|
n += 0.125 * snoise(float3((UV * 8.0 - 3.0 * Step) * Scale, Time * VerticalSpeed));
|
||
|
|
n += 0.0625 * snoise(float3((UV * 16.0 - 4.0 * Step) * Scale, Time * VerticalSpeed));
|
||
|
|
n += 0.03125 * snoise(float3((UV * 32.0 - 5.0 * Step) * Scale, Time * VerticalSpeed));
|
||
|
|
|
||
|
|
Sample = Coverage + 0.5 * n;
|
||
|
|
|
||
|
|
// int cells = 7;
|
||
|
|
// cells = cells - 1;
|
||
|
|
|
||
|
|
// Sample *= cells;
|
||
|
|
// Sample = floor(Sample);
|
||
|
|
// Sample /= cells;
|
||
|
|
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
|
||
|
|
#endif
|