This file is indexed.

/usr/share/libwildmagic/Data/CgShaders/Texture2Add.fx is in libwildmagic-common 5.13-1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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// The application can changes these parameters at run time.
sampler2D Sampler0 = sampler_state
{
   MinFilter = Nearest;
   MagFilter = Nearest;
   WrapS     = Clamp;
   WrapT     = Clamp;
};

sampler2D Sampler1 = sampler_state
{
   MinFilter = Nearest;
   MagFilter = Nearest;
   WrapS     = Clamp;
   WrapT     = Clamp;
};

void v_Texture2Add
(
    in float3 modelPosition : POSITION,
    in float2 modelTCoord0 : TEXCOORD0,
    in float2 modelTCoord1 : TEXCOORD1,
    out float4 clipPosition : POSITION,
    out float2 vertexTCoord0 : TEXCOORD0,
    out float2 vertexTCoord1 : TEXCOORD1,
    uniform float4x4 PVWMatrix
)
{
    // Transform the position from model space to clip space.
    clipPosition = mul(PVWMatrix, float4(modelPosition,1.0f));

    // Pass through the texture coordinates.
    vertexTCoord0 = modelTCoord0;
    vertexTCoord1 = modelTCoord1;
}

void p_Texture2Add
(
    in float2 vertexTCoord0 : TEXCOORD0,
    in float2 vertexTCoord1 : TEXCOORD1,
    out float4 pixelColor : COLOR
)
{
    // Sample the texture images and add the results.
    float4 color0 = tex2D(Sampler0, vertexTCoord0);
    float4 color1 = tex2D(Sampler1, vertexTCoord1);
    pixelColor = saturate(color0 + color1);
}