dolphin/Data/User/Shaders/nightvision.txt

uniform samplerRECT samp0 : register(s0);

void main(out float4 ocol0 : COLOR0, in float2 uv0 : TEXCOORD0)
{
  float4 c0 = texRECT(samp0, uv0).rgba;
  float green = c0.g;

  if (c0.g < 0.50)
  {
    green = c0.r + c0.b;
  }

  ocol0 = float4(0.0, green, 0.0, 1.0);
}