Блик HLSL fx

float4x4 ViewProj : ViewProjection;
float4x4 World : World;

float Time;
float4 BlickColor;

struct VertexOutput
{
   float4 Pos: POSITION;
   float2 TexCoord: TEXCOORD0;
};

texture MainTexture : MainTexture;
sampler MainTextureSampler = sampler_state {
    Texture = <MainTexture>;
    MinFilter=linear;
    MagFilter=linear;
    MipFilter=linear;
};
texture StencilTexture : StencilTexture;
sampler StencilTextureSampler = sampler_state {
    Texture = <StencilTexture>;
    MinFilter=linear;
    MagFilter=linear;
    MipFilter=linear;
};
texture TimeTexture : TimeTexture;
sampler TimeTextureSampler = sampler_state {
    Texture = <TimeTexture>;
    MinFilter=linear;
    MagFilter=linear;
    MipFilter=linear;
};

float4 PixelShaderFunction(VertexOutput input) : COLOR0
{
    float4 ResultColor = tex2D(MainTextureSampler, input.TexCoord);

    float4 StencilColor = tex2D(StencilTextureSampler, input.TexCoord);
    if (all(StencilColor))
    {
        float4 MidT = tex2D(TimeTextureSampler, input.TexCoord);
        float Dt = (Time - MidT.x);
        float LerpValue;
        if (Dt < 0)
        {
            LerpValue = abs(Dt / MidT.x);
        }
        else
        {
            LerpValue = abs(Dt / (1 - MidT.x));
        }

        ResultColor = lerp(BlickColor, ResultColor, LerpValue);
    }

    return ResultColor;
}

technique Blick
{
    pass Pass1
    {
        // TODO: set renderstates here.
        CullMode = None;

        PixelShader = compile ps_2_0 PixelShaderFunction();
    }
}