The Witcher 3 - the Moon shader v. 1.0

// HLSL function stub generated

//SamplerComparisonState sampler0 : register(s0); // can't disambiguate
SamplerState sampler0 : register(s0); // can't disambiguate
Texture2D<float4> texture0 : register(t0);


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};



struct InputStruct {
	float4 param0 : TEXCOORD0;
	float4 param1 : TEXCOORD1;
	float4 param2 : TEXCOORD2;
	float4 param3 : TEXCOORD3;
	float3 param4 : TEXCOORD4;
};

static const float PI = 3.14159265359;
static const float TWOPI = 2.0 * PI;
static const float SYNODIC_MONTH_LENGTH = 29.53;

float4 MoonPS(in InputStruct IN) : SV_Target0
{
    // Texcoords offset
	float2 uvOffsets = float2(-cb0_v0.w, 0.0);

    // Final texcoords
	float2 uv = IN.param2.xy + uvOffsets;

    // Sample texture
	float4 sampledTexture = texture0.Sample( sampler0, uv );

    // Moon surface color - perform gamma correction
	float moonColorTex = pow(sampledTexture.a, 2.2);

    // Unpack normal from [0,1] to [-1,1] range.
    // Note: sampledNormal * 2.0 - 1.0 works the same way
	float3 sampledNormal = normalize((sampledTexture.xyz - 0.5) * 2);

    // Tangent space vectors
	float3 Tangent = IN.param4.xyz;
	float3 Normal = float3(IN.param2.zw, IN.param3.w);
	float3 Bitangent = IN.param3.xyz;

    // TBN matrix
	float3x3 TBN = float3x3(Tangent, Bitangent, Normal);

    // Calculate XY normal vector
    // Squeeze TBN matrix to float3x2: 3 rows, 2 columns
	float2 vNormal = mul(sampledNormal, (float3x2)TBN).xy;

	// Lunar phase.
    // We calculate days/29.53 + bias.
	float phase = cb0_v0.y * (1.0 / SYNODIC_MONTH_LENGTH) + cb0_v0.w;

    // Multiply by 2*PI. This way 29.53 will be a full period
    // for sin/cos functions.
	phase *= TWOPI;

    // Calculate sine and cosine of lunar phase.
	float outSin = 0.0;
	float outCos = 0.0;
	sincos(phase, outSin, outCos);

    // Calculate lunar phase
	float lunarPhase = saturate( dot(vNormal, float2(outCos, outSin)) );


    // Perform a series of multiplications to calculate final color.

    // cb12_v266.xyz is used to boost Moon's glow and color.
    // for example (1.54, 2.82, 4.13)
    float3 moonSurfaceGlowColor = cb12_v266.xyz;

	float3 moonColor = lunarPhase * moonSurfaceGlowColor;
    moonColor = moonColorTex * moonColor;

    // cb_v2.xyz is probably a filter, like (1.0, 1.0, 1.0)
	moonColor *= cb2_v2.xyz;

    // I'm not really sure what this thing is, maybe some horizon opacity value.
    // Anyway, it doesn't seem to have that much influence to final color
    // as parameters above.
	float paramHorizon = saturate(1.0 - IN.param1.w);
	paramHorizon *= cb2_v2.w;

	moonColor *= paramHorizon;

    // Output final color with zero alpha
	return float4(moonColor, 0.0);
}