Simple Hue Shifting in ReShade 2.0.1

/*
    This code is shared under the Creative Commons Attribution-NonCommercial-ShareAlike license.
    You can find more information about this license at https://creativecommons.org/licenses/by-nc-sa/2.5/
    This file contains code written by J. "fluffy" Shagam and made available under the same license.
    You can find more of fluffy's work at https://beesbuzz.biz
    Feel free to modify and share any code in this file, but make sure you honor fluffy's original license.
*/

#pragma message "Disco Shader v1"

uniform float speed = 10;

uniform float shift = 60;

uniform int framecount < source = "framecount"; >;
static const float nPI = 3.14159265f; 

float3 PS_colorCycle(float4 pos : SV_Position, float2 texcoord : TEXCOORD) : SV_Target {
    float3 input = tex2D(ReShade::BackBuffer, texcoord).rgb;
    float3 output;
    
    float offset = shift + ((framecount)*speed/10.0);
    
    /*     
        The following code is copyright J. "fluffy" Shagam and made available to the public  s
        under the Creative Commons Attribution-NonCommercial-ShareAlike license.
        You can find more information about this license at https://creativecommons.org/licenses/by-nc-sa/2.5/
        You can find more of fluffy's work at https://beesbuzz.biz
        You can find this code specifically at https://beesbuzz.biz/code/hsv_color_transforms.php
    */
    
    float U = cos(offset*nPI/180.0);
    float W = sin(offset*nPI/180.0);

    output.r = (.299+.701*U+.168*W)*input.r + (.587-.587*U+.330*W)*input.g + (.114-.114*U-.497*W)*input.b;
    output.g = (.299-.299*U-.328*W)*input.r + (.587+.413*U+.035*W)*input.g + (.114-.114*U+.292*W)*input.b;
    output.b = (.299-.3*U+1.25*W)*input.r + (.587-.588*U-1.05*W)*input.g + (.114+.886*U-.203*W)*input.b;
    
    return output;
}

technique colorCycle {
    pass colorCycle {
        	VertexShader = ReShade::VS_PostProcess;
            PixelShader = PS_colorCycle;
        }
}