Problem With Hlsl Of Blur

Problem With Hlsl Of Blur

Im trying run some shader of blur in my game, but nothing happen and the render be normal, without blur..

 

HLSL Code:

sampler ColorSampler1 : register(s0);

#define SAMPLE_SIZE 15

float2 texelSize = {1/1024,1/768};
float offsets[SAMPLE_SIZE] = {-0.006836,-0.005859,-0.004883,-0.003906,-0.002930,-0.001953,-0.000977,0.000000,0.000977,0.001953,0.002930,0.003906,0.004883,0.005859,0.006836};
float weights[SAMPLE_SIZE] = {0.008847,0.018216,0.033562,0.055335,0.081638,0.107778,0.127325,0.134598,0.127325,0.107778,0.081638,0.055335,0.033562,0.018216,0.008847};

float4 PS_BlurH(float2 texCoord : TEXCOORD0) : COLOR0
{
        float4 sum = float4(0.0, 0.0, 0.0, 1.0);
        
        for (int i = 0; i < SAMPLE_SIZE; i++)
                sum += tex2D(ColorSampler1, float2(texCoord.x + (offsets[i] * texelSize.x), texCoord.y)) * weights[i];
        
        clip(sum.a < 0.01f ? -1 : 1);
        
        return sum;
}

float4 PS_BlurV(float2 texCoord : TEXCOORD0) : COLOR0
{
        float4 sum = float4(0.0, 0.0, 0.0, 1.0);
        
        for (int i = 0; i < SAMPLE_SIZE; i++)
                sum += tex2D(ColorSampler1, float2(texCoord.x, texCoord.y + (offsets[i] * texelSize.y))) * weights[i];
        
        clip(sum.a < 0.01f ? -1 : 1);
        
        return sum;
}

technique Glow
{
        pass BlurHorizontal
        {
                PixelShader = compile ps_2_0 PS_BlurH();
        }
        
        pass BlurVertical
        {
                PixelShader = compile ps_2_0 PS_BlurV();
        }
}

Screenshot:

 

As can see in pic, nothing happens with meshe, dno why.. If i change values of offsets and weights same thing... Blur dont work.

Someone know what can be? Thanks