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gaming.hlsl

Texture2D shaderTexture;
SamplerState samplerState;

cbuffer PixelShaderSettings {
  float  Time;
  float  Scale;
  float2 Resolution;
  float4 Background;
};

float3 hsv2rgb(float3 hsv)
{
    // ref. https://gist.github.com/iUltimateLP/5129149bf82757b31542
    float4 K = float4(1.0, 2.0 / 3.0, 1.0 / 3.0, 3.0);
    float3 p = abs(frac(hsv.xxx + K.xyz) * 6.0 - K.www);
    return hsv.z * lerp(K.xxx, clamp(p - K.xxx, 0.0, 1.0), hsv.y);
}

float4 main(float4 pos : SV_POSITION, float2 tex : TEXCOORD) : SV_TARGET
{
    float4 color = shaderTexture.Sample(samplerState, tex);
    float t = Time * 16;
    float2 b = step(1.0, (tex * Resolution + t) % 20);
    color.xyz += hsv2rgb(float3(Time + (tex.x + tex.y) / 4, 1.0, 0.6)) * step(b.x + b.y, 1.0);
    return color;
}