#version 460

in Varyings {
    layout(location = 0) vec3 texCoord;
} var;

layout(set = 0, binding = 1) uniform sampler _Sampler;
layout(set = 0, binding = 2) uniform textureCube _Texture;

layout(location = 0) out vec4 fragColor;

vec3 toneMapAcesNarkowicz(vec3 color) {
    const float A = 2.51;
    const float B = 0.03;
    const float C = 2.43;
    const float D = 0.59;
    const float E = 0.14;
    return clamp((color * (A * color + B)) / (color * (C * color + D) + E), 0.0, 1.0);
}

void main() {
    vec4 texel = texture(samplerCube(_Texture, _Sampler), var.texCoord);
    vec3 outgoingRadiance = texel.rgb;

    vec3 toneMappedLinearColor = toneMapAcesNarkowicz(outgoingRadiance);
    vec3 toneMappedSrgbColor = pow(toneMappedLinearColor, vec3(1.0 / 2.2));

    fragColor = vec4(toneMappedSrgbColor, 1.0);
}