uniform sampler2D Render;
uniform sampler2D Tex0;
uniform sampler2D Tex1;

uniform vec2 PixelSize;

float Distance = 10.0;
float Range = 5.0;
float Far = 2450.0;

void main() {
    vec2 uv = gl_TexCoord[0].xy;
    Distance = texture2D(Tex1, vec2(0.5, 0.5)).x;
    float currentDepth = texture2D(Tex1, uv).x;
    vec3 color = texture2D(Tex0, uv).rgb;
    vec3 colorBlur = texture2D(Render, uv).rgb;
    float depthLin = currentDepth;
    float blur = 0.0;
    float nearBoundDOF = clamp((Distance - 20.0/Far),0.0,Distance);
    float farBoundDOF = clamp((Distance + 20.0/Far),Distance,1.0);
    if (depthLin > farBoundDOF)
       blur = clamp(((depthLin - farBoundDOF)/farBoundDOF),0.0,1.0);
    else if (depthLin < nearBoundDOF)
        blur = (nearBoundDOF - depthLin)/nearBoundDOF;
    gl_FragData[0].rgba = vec4(mix(color, colorBlur, blur), 1.0);
}