--track@th:threshold,0.0, 1.0, 0.5, 0.01
--track@str:strength,0.0, 1.0, 0.5, 0.01
--track@seed:seed,0,2000,0,1
--track@size:size,1, 100, 1, 1
--color@ca:Color1,0xffffff
--color@cb:Color2,0x000000
--label:色調整
--[[pixelshader@psmain:
Texture2D InputTexture : register(t0);

cbuffer constant0 : register(b0) {
	float th;
	float3 ca;
	float3 cb;
	float str;
	float size;
	float seed;
};

float rand(float2 co,int seed) {
    return frac(sin(dot(co, float2(12.9898,78.233)) + seed) * 43758.5453);
}


float4 psmain(float4 pos : SV_Position) : SV_Target {
    float4 tex = InputTexture[uint2(pos.xy)];
    float2 uv=floor(pos.xy/size);
    float threshold = th + + (rand(uv,seed) - 0.5) * str;
    float lum = dot(tex.rgb, float3(0.2126, 0.7152, 0.0722));
	float3 dithered =  lum >= threshold ? ca : cb;
    return float4(dithered, tex.a);
}
]]

local ar, ag, ab = RGB(ca)
local br, bg, bb = RGB(cb)
ar,ag,ab,br,bg,bb=ar/255,ag/255,ab/255,br/255,bg/255,bb/255

obj.pixelshader("psmain","object","object",{th,ar,ag,ab,br,bg,bb,str,size,seed})