Rasagar/Library/PackageCache/com.unity.terrain-tools/Shaders/NoiseLib/Templates/FractalFbm.noisehlsltemplate

#ifndef UNITY_TERRAIN_TOOL_NOISE_${VariantName}_INC
#define UNITY_TERRAIN_TOOL_NOISE_${VariantName}_INC

/*=========================================================================

    Includes

=========================================================================*/

${Includes}

${FractalDataDefinitions}

/*=========================================================================

    Fractal Functions

=========================================================================*/

float noise_${VariantName}_Raw( float pos, ${FunctionParams} )
{
    float prev = 0;
    float n = 0;

    float octaves = ceil(fractalInput.octaves) + (1 - sign(frac(fractalInput.octaves)));

    for( float i = 0; i < octaves; ++i )
    {
        prev = n;
        n += fractalInput.amplitude * get_noise_${NoiseName}( pos * fractalInput.frequency );
        fractalInput.frequency *= fractalInput.lacunarity;
        fractalInput.amplitude *= fractalInput.persistence;
    }

    n = lerp(prev, n, frac(fractalInput.octaves));

    return n;
}

float noise_${VariantName}_Raw( float2 pos, ${FunctionParams} )
{
    float prev = 0;
    float n = 0;

    float octaves = ceil(fractalInput.octaves) + (1 - sign(frac(fractalInput.octaves)));

    for( float i = 0; i < octaves; ++i )
    {
        prev = n;
        n += fractalInput.amplitude * get_noise_${NoiseName}( pos * fractalInput.frequency );
        fractalInput.frequency *= fractalInput.lacunarity;
        fractalInput.amplitude *= fractalInput.persistence;
    }

    n = lerp(prev, n, frac(fractalInput.octaves));

    return n;
}

float noise_${VariantName}_Raw( float3 pos, ${FunctionParams} )
{
    float prev = 0;
    float n = 0;

    float octaves = ceil(fractalInput.octaves) + (1 - sign(frac(fractalInput.octaves)));

    for( float i = 0; i < octaves; ++i )
    {
        prev = n;
        n += fractalInput.amplitude * get_noise_${NoiseName}( pos * fractalInput.frequency );
        fractalInput.frequency *= fractalInput.lacunarity;
        fractalInput.amplitude *= fractalInput.persistence;
    }

    n = lerp(prev, n, frac(fractalInput.octaves));

    return n;
}

float noise_${VariantName}_Raw( float4 pos, ${FunctionParams} )
{
    float prev = 0;
    float n = 0;

    float octaves = ceil(fractalInput.octaves) + (1 - sign(frac(fractalInput.octaves)));

    for( float i = 0; i < octaves; ++i )
    {
        prev = n;
        n += fractalInput.amplitude * get_noise_${NoiseName}( pos * fractalInput.frequency );
        fractalInput.frequency *= fractalInput.lacunarity;
        fractalInput.amplitude *= fractalInput.persistence;
    }

    n = lerp(prev, n, frac(fractalInput.octaves));

    return n;
}

/*=========================================================================

    ${VariantName} Noise Functions - Fractal, Warped

=========================================================================*/

float noise_${VariantName}( float pos, ${FunctionParams} )
{
    if(fractalInput.warpIterations > 0)
    {
        float prev = 0;
        float warpIterations = ceil(fractalInput.warpIterations) + (1 - sign(frac(fractalInput.warpIterations)));

        // do warping
        for ( float i = 0; i < warpIterations; ++i )
        {
            float q = noise_${VariantName}_Raw( pos + fractalInput.warpOffsets.x, ${FunctionInputs} );
            prev = pos;
            pos = pos + fractalInput.warpStrength * q;
        }

        pos = lerp(prev, pos, frac(fractalInput.warpIterations));
    }

    float f = noise_${VariantName}_Raw( pos, ${FunctionInputs} );

    return f;
}

float noise_${VariantName}( float2 pos, ${FunctionParams} )
{
    if(fractalInput.warpIterations > 0)
    {
        float2 prev = 0;
        float warpIterations = ceil(fractalInput.warpIterations) + (1 - sign(frac(fractalInput.warpIterations)));

        // do warping
        for ( float i = 0; i < warpIterations; ++i )
        {
            float2 q = float2( noise_${VariantName}_Raw( pos, ${FunctionInputs} ),
                            noise_${VariantName}_Raw( pos + fractalInput.warpOffsets.xy, ${FunctionInputs} ) );
            prev = pos;

            pos = pos + fractalInput.warpStrength * q;
        }
        
        pos = lerp(prev, pos, frac(fractalInput.warpIterations));
    }

    float f = noise_${VariantName}_Raw( pos, ${FunctionInputs} );

    return f;
}

float noise_${VariantName}( float3 pos, ${FunctionParams} )
{
    if(fractalInput.warpIterations > 0)
    {
        float3 prev = 0;
        float warpIterations = ceil(fractalInput.warpIterations) + (1 - sign(frac(fractalInput.warpIterations)));

        // do warping
        for ( float i = 0; i < warpIterations; ++i )
        {
            float3 q = float3( noise_${VariantName}_Raw( pos.xyz, ${FunctionInputs} ),
                        noise_${VariantName}_Raw( pos.xyz + fractalInput.warpOffsets.xyz, ${FunctionInputs} ),
                        noise_${VariantName}_Raw( pos.xyz + float3( fractalInput.warpOffsets.x, fractalInput.warpOffsets.y, 0 ), ${FunctionInputs} ) );
            prev = pos;
            pos = pos + fractalInput.warpStrength * q;
        }
        
        pos = lerp(prev, pos, frac(fractalInput.warpIterations));
    }
    
    float f = noise_${VariantName}_Raw( pos, ${FunctionInputs} );

    return f;
}

float noise_${VariantName}( float4 pos, ${FunctionParams} )
{
    float f = noise_${VariantName}_Raw( pos, ${FunctionInputs} );

    return f;
}

#endif // UNITY_TERRAIN_TOOL_NOISE_${VariantName}_INC