Simple shader for sprite interface [closed]

This is the shader I use to push my pre-built HUD texture to the full display window. I compile it using the VS_4_0 and PS_4_0 profiles which I'm not sure will work right with DX9. The mesh I use with this shader is a simple quad ranging from (-1,-1,0) to (1,1,0) (note the zeros for Z -- there is no depth involved... the -1 to 1 range maps to the corners of the screen, and (0,0) is in the middle). If you do have a problem compiling for DX9 (VS3/PS3), the problem will most likely be with the SV_POSITION and SV_TARGET semantics. This shader is also meant to be used with alpha blending configured, but there is no reason It cant be used without blending.

struct VS_IN
{
    float4 pos : POSITION;
    float2 tex : TEXCOORD;
};

struct PS_IN
{
    float4 pos : SV_POSITION;
    float2 tex : TEXCOORD;
};

Texture2D picture;
SamplerState pictureSampler;

PS_IN VS(VS_IN input)
{
    PS_IN output = (PS_IN)0;

    output.pos = input.pos;
    output.tex = input.tex;

    return output;
}

float4 PS(PS_IN input) : SV_Target
{
    return picture.Sample(pictureSampler, input.tex);
}