flower/Install/Shader/Source/Cloud_NoiseDetail.glsl

#version 460

/*
** Physical based render code, develop by engineer: qiutanguu.
*/

#extension GL_GOOGLE_include_directive : enable

#include "Noise.glsl"

layout (set = 0, binding = 0, r8) uniform image3D imageWorleyNoise; // 32 x 32 x 32

#define kDetailFrequency 8.0

layout (local_size_x = 8, local_size_y = 8, local_size_z = 1) in;
void main()
{
    ivec3 texSize = imageSize(imageWorleyNoise);
    ivec3 workPos = ivec3(gl_GlobalInvocationID.xyz);

    if(workPos.x >= texSize.x || workPos.y >= texSize.y || workPos.z >= texSize.z)
    {
        return;
    }

    const vec3 uvw = (vec3(workPos) + vec3(0.5f)) / vec3(texSize);

    float detailNoise = 
		worleyFbm(uvw, kDetailFrequency * 1.0) * 0.625 +
    	worleyFbm(uvw, kDetailFrequency * 2.0) * 0.250 +
    	worleyFbm(uvw, kDetailFrequency * 4.0) * 0.125;

	imageStore(imageWorleyNoise, workPos, vec4(detailNoise));
}