--track@th:Threshold,0,100,50,0.1
--color@col:Color,0xffffff
--select@lum_mode:Lum Mode=1,BT.601=0,BT.709=1,BT.2020=2,Mean=3
--check@inv:Invert,0
--label:色調整
--[[pixelshader@psmain:
Texture2D InputTexture : register(t0);

cbuffer constant0 : register(b0) {
	float th;
	float3 col;
    float lum_mode;
    float inv;
};

float luminance(float3 col, int mode){
    float3 weights=float3(0.299,0.587,0.114); // BT.601
    switch (mode) {
        case 1: // BT.709
            weights=float3(0.2126, 0.7152, 0.0722);
            break;
        case 2: // BT.2020
            weights=float3(0.2627, 0.6780, 0.0593);
            break;
        case 3: //mean
            weights=float3(0.3333,0.3333,0.3333);
            break;
    }
    return dot(col, weights);
}


float4 psmain(float4 pos : SV_Position) : SV_Target {
    float4 tex = InputTexture[uint2(pos.xy)];
    float sim=dot(normalize(tex.rgb),normalize(col));
    if (inv==0 && sim<th || inv==1 && sim>th){
        float v = luminance(tex.rgb,lum_mode);
        tex.rgb=float3(v,v,v);
    }
    return float4(tex);
}
]]

local r, g, b = RGB(col)
r,g,b=r/255,g/255,b/255

obj.pixelshader("psmain","object","object",{th/100,r,g,b,lum_mode,inv})