texture myTexture;
sampler2D samplerState = sampler_state {
Texture = ;
MinFilter = Point;
MagFilter = Point;
MipFilter = Linear;
AddressU = CLAMP;
AddressV = CLAMP;
};

float xcenter;
float ycenter;
float magnitude;
float width;

struct VS_OUTPUT
{
float4 Position : POSITION;
float2 TexCoords : TEXCOORD0;
};

float4 shockwave (VS_OUTPUT Input) : COLOR0
{

float4 colour;
float xdif = Input.TexCoords.x – xcenter;
float ydif = Input.TexCoords.y – ycenter;
float2 center;
center.x = xdif;
center.y = ydif;
float distance = sqrt(xdif * xdif + ydif * ydif);

if((distance = magnitude – width)){
float diff = (distance – magnitude);
float powDiff = 1.0 – pow(abs(diff*10.0), 1.5);
float diffTime = diff * powDiff;
float2 diffUV = normalize(Input.TexCoords – center);
Input.TexCoords = Input.TexCoords + (diffUV * diffTime);
}

colour = tex2D(samplerState, Input.TexCoords);

return colour;
}

technique Main {
pass P0{
PixelShader = compile ps_2_0 shockwave();
}
}