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[Cg] Passing arrays to vertex shader

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I'm trying to write a vertex skinning shader and I'm having troubles passing any type of array to vertex shader.

Let's say I have a global array in vertex shader like this:
float ar[2];

In my application let's say I create simple array:
float v2[2]={1, 0.5f};

And then I try to pass it over like this:
cgSetParameter1fv(this->cgManager.test_array, v2);

When I do this I get "Invaild parameter handle" error. test_array parameter is binded correctly like any other non-array uniform (when I try the same thing with single variables it works). Does arrays need extra steps? How would I upload values into it?

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