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Popular blend mode algorithms implemented in Nvidia's Cg. https://elringus.me/blend-modes-in-unity/
fixed3 Darken (fixed3 a, fixed3 b)
{
return min(a, b);
}
fixed3 Multiply (fixed3 a, fixed3 b)
{
return a * b;
}
fixed3 ColorBurn (fixed3 a, fixed3 b)
{
return saturate(1.0 - (1.0 - a) / b);
}
fixed3 LinearBurn (fixed3 a, fixed3 b)
{
return a + b - 1.0;
}
fixed3 DarkerColor (fixed3 a, fixed3 b)
{
return G(a) < G(b) ? a : b;
}
fixed3 Lighten (fixed3 a, fixed3 b)
{
return max(a, b);
}
fixed3 Screen (fixed3 a, fixed3 b)
{
return 1.0 - (1.0 - a) * (1.0 - b);
}
fixed3 ColorDodge (fixed3 a, fixed3 b)
{
return saturate(a / (1.0 - b));
}
fixed3 LinearDodge (fixed3 a, fixed3 b)
{
return a + b;
}
fixed3 LighterColor (fixed3 a, fixed3 b)
{
return G(a) > G(b) ? a : b;
}
fixed3 Overlay (fixed3 a, fixed3 b)
{
return a > .5 ? 1.0 - 2.0 * (1.0 - a) * (1.0 - b) : 2.0 * a * b;
}
fixed3 SoftLight (fixed3 a, fixed3 b)
{
return (1.0 - a) * a * b + a * (1.0 - (1.0 - a) * (1.0 - b));
}
fixed3 HardLight (fixed3 a, fixed3 b)
{
return b > .5 ? 1.0 - (1.0 - a) * (1.0 - 2.0 * (b - .5)) : a * (2.0 * b);
}
fixed3 VividLight (fixed3 a, fixed3 b)
{
return saturate(b > .5 ? a / (1.0 - (b - .5) * 2.0) : 1.0 - (1.0 - a) / (b * 2.0));
}
fixed3 LinearLight (fixed3 a, fixed3 b)
{
return b > .5 ? a + 2.0 * (b - .5) : a + 2.0 * b - 1.0;
}
fixed3 PinLight (fixed3 a, fixed3 b)
{
return b > .5 ? max(a, 2.0 * (b - .5)) : min(a, 2.0 * b);
}
fixed3 HardMix (fixed3 a, fixed3 b)
{
return (b > 1.0 - a) ? 1.0 : .0;
}
fixed3 Difference (fixed3 a, fixed3 b)
{
return abs(a - b);
}
fixed3 Exclusion (fixed3 a, fixed3 b)
{
return a + b - 2.0 * a * b;
}
fixed3 Subtract (fixed3 a, fixed3 b)
{
return a - b;
}
fixed3 Divide (fixed3 a, fixed3 b)
{
return saturate(a / b);
}
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