Hi all,

I have this simple post process blur shader:

sampler ColorSampler1 : register(s0);

#define SAMPLE_SIZE 15

float2 texelSize;
float offsets[SAMPLE_SIZE];
float weights[SAMPLE_SIZE];

float4 PS_BlurH(float2 texCoord : TEXCOORD0) : COLOR0
{
    float4 sum = float4(0.f, 0.f, 0.f, 1.f);
    
    [loop]
    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.f, 0.f, 0.f, 1.f);
    
    [loop]
    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();
    }
}

But if I change ps_2_0 to ps_3_0 the shader doesn't work anymore? No errors on compiling...

Anyone with a clue?

Could it be because ps_3_0 requires a vs_3_0 vertex shader?