How do I pass a "uniform value" / Shader permutations

@kosmonautgames wrote:

What is wrong with this implementation?

I can't seem to find a way to pass uniforms during compile time like i could in xna, did something change?

technique WithValueOne
{
    pass Pass1
    {
        VertexShader = compile vs_5_0 VertexShaderFunction();
        PixelShader = compile ps_5_0 PixelShaderFunction(1);
    }
}

technique WithValueZero
{
    pass Pass1
    {
        VertexShader = compile vs_5_0 VertexShaderFunction();
        PixelShader = compile ps_5_0 PixelShaderFunction(0);
    }
}

and in my Pixelshader

PixelShaderFunction(VertexShaderOutput input, uniform float inputvalue)
{
     ...
     if(inputvalue > 0) 
{ do stuff }
}

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