Irrlicht Engine

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uniform sampler2D ColorSampler;
uniform sampler2D BlurredSampler;
uniform sampler2D DepthSampler;
 
float getDepth(vec2 coords) {
    vec4 texDepth = texture2D(DepthSampler, coords);
    return texDepth.r;
}
 
void main(void) {
    vec4 sharp = texture2D(ColorSampler, gl_TexCoord[0].xy);
    vec4 blur = texture2D(BlurredSampler, gl_TexCoord[0].xy);
 
    float depth = clamp(getDepth(gl_TexCoord[0].xy)*10.0, 0.0, 1.0);
 
    float fmix = 0.0;
    if (depth < 0.05)
        fmix = 1.0;
    else if(depth < 0.1)
        fmix = 20.0 *(0.1 - depth);
    else if(depth < 0.5)
        fmix=0.0;
    else
        fmix = 2.0 *(depth - 0.5);
 
    fmix = clamp(depth, 0.0, 0.90);
 
    gl_FragColor = mix(sharp, blur, fmix);
}