struct PS_INPUT
{
    float2 center: TEXCOORD0;
    float radius :TEXCOORD1;
    float4 color :TEXCOORD2;
    float2 screenPos : VPOS;
};


struct PS_OUTPUT
{
    float4  color: COLOR0;
};

///////////////////////////////////////////////////////////////////////////////

sampler tex0: register(s0);

///////////////////////////////////////////////////////////////////////////////
// Pixelshader
// Profile: 3x0



PS_OUTPUT main(PS_INPUT input)
{

float2 targetResolution = 128.0;

PS_OUTPUT output;

float2 screen = input.screenPos / targetResolution;
screen *= float2(2, 2);
screen -= float2(1, 1);
screen.y *= -1;

float d = 1.0 - saturate(length(input.center - screen) / input.radius);
output.color = float4(d, d, d, 0.05);
//output.color = float4(screen.x, 0, 0, 1);
return output;
}

///////////////////////////////////////////////////////////////////////////////