#version 330 core

const float GAMMA = 2.2f;

layout(location = 0) out vec4 f_color;

in vec2 v_tex_coords;

uniform float u_exposure;
uniform bool u_exposureCorrection;

uniform sampler2D u_texture;

void main() {

    vec3 fragmentColor = vec3(texture2D(u_texture, v_tex_coords));

    // Exposure tone mapping
    if(u_exposureCorrection)
        fragmentColor = vec3(1.0) - exp(-fragmentColor * u_exposure);

    // Gamma correction
    fragmentColor = pow(fragmentColor, vec3(1.0/GAMMA));

    f_color = vec4(fragmentColor, 1.0f);

}