#version 330 core
out vec4 FragColor;
  
in vec2 tc;

uniform sampler2D depthMap;

float rescale_z(float z){
	float n = 0.05;
	float f = 20.;
	return (2*n*f/(z*(n-f)+n+f))/f;
}

void main()
{             
    float depthValue = texture(depthMap, tc).r;
    FragColor = vec4(vec3(rescale_z(depthValue)+0.5), 1.0);
}