geometry_material_map_vs.hlsl

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struct VsOutput
{
    float4 position : SV_Position;
    float2 psPosition : POSITION;
};

VsOutput main(const uint vertexIndex : SV_VertexID)
{
    VsOutput output;

    switch(vertexIndex % 3)
    {
        case 0: output.position = float4(-1, -1, 0, 1); break;
        case 1: output.position = float4( 3, -1, 0, 1); break;
        case 2: output.position = float4(-1,  3, 0, 1); break;
    }

    output.psPosition = output.position.xy;

	return output;
}