I'm trying to do something like this in Skyrim


struct VS_TEST_OUT
{
float4 vpos : POSITION;
float2 txcoord : TEXCOORD0;
float2 array[10] : TEXCOORD1;
};

and it cause strange stuff when increasing size.
Is it legit to use array or better to split it across TEXCOORD[n] ?

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TEXCOORD1, TEXCOORD2, etc allow only 1 vector or scalar to be used, not arrays. So you need to write something like this:
float4 array0_1 : TEXCOORD1;
float4 array2_3 : TEXCOORD2;
float4 array4_5 : TEXCOORD3;
etc.

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OK, thx.

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