#include "atmosphere.glsl"

in vec3 ViewDirection;

layout(std140, binding = 1) uniform UniformSceneData {
    vec3 sunPosition;
    bool useTexture;
} sceneData;

layout(location = 0) out vec4 outColor;
layout(location = 1) out vec4 outBright;

layout(binding = 2) uniform samplerCube skyboxSampler;

void main()
{
    vec3 result;

    if(sceneData.useTexture)
    {
        result = texture(skyboxSampler, ViewDirection).rgb;
    }
    else
    {
        result = atmosphere(
            normalize(ViewDirection),
            vec3(0, 6372e3, 0),                  // ray origin
            sceneData.sunPosition,          // position of the sun
            22.0,                           // intensity of the sun
            6371e3,                         // radius of the planet in meters
            6471e3,                         // radius of the atmosphere in meters
            vec3(5.5e-6, 13.0e-6, 22.4e-6), // Rayleigh scattering coefficient
            21e-6,                          // Mie scattering coefficient
            8e3,                            // Rayleigh scale height
            1.2e3,                          // Mie scale height
            0.758                           // Mie preferred scattering direction
        );
    }

    outColor = vec4(result, 1.0);

    float brightness = dot(outColor.rgb, vec3(0.2126, 0.7152, 0.0722));
    if(brightness > 1.6)
        outBright = vec4(outColor.rgb, 1.0);
}