vec4 color_accum = vec4(0.0);

    float max_accum=0;

    for(int i=0;i<dof_kernel_size;i++) {

        int int_ofs = i-dof_kernel_from;
        vec2 tap_uv = uv_interp + dof_dir * float(int_ofs) * dof_radius;
        float ofs_influence = max(0.0,1.0-float(abs(int_ofs))/float(dof_kernel_from));

        float tap_k = dof_kernel[i];

        vec4 tap_color = textureLod( source_color, tap_uv, 0.0);

        float tap_depth = texture( dof_source_depth, tap_uv, 0.0).r;
        tap_depth = tap_depth * 2.0 - 1.0;
        tap_depth = 2.0 * camera_z_near * camera_z_far / (camera_z_far + camera_z_near - tap_depth * (camera_z_far - camera_z_near));
        float tap_amount = 1.0-smoothstep(dof_end,dof_begin,tap_depth);
        tap_amount*=tap_amount*tap_amount; //prevent undesired glow effect

#ifdef DOF_NEAR_FIRST_PASS

        tap_color.a= 1.0-smoothstep(dof_end,dof_begin,tap_depth);

#endif

        max_accum=max(max_accum,tap_amount*ofs_influence);

        color_accum+=tap_color*tap_k;

    }

    color_accum.a=max(color_accum.a,sqrt(max_accum));