#version 330 core

uniform sampler2DRect colorSampler;

uniform float exposition;
uniform float gamma;

layout(location = 0)out vec4 outColor;

void main(void) {
    ivec2 pos = ivec2(gl_FragCoord.xy);
    vec3 color = texelFetch(colorSampler, pos).xyz;

    // Exposure tone mapping
    vec3 mapped = vec3(1.0) - exp(-color * 1);

    // Gamma correction
    mapped = pow(mapped, vec3(1.0 / gamma));

    outColor = vec4(mapped, 1.0);
}