uniform vec3 u_solar_irradiance;
uniform float u_sun_angular_radius;
uniform float u_bottom_radius;
uniform float u_top_radius;
uniform vec3 u_rayleigh_scattering;
uniform vec3 u_mie_scattering;
uniform float u_mie_phase_function_g;
uniform float u_mu_s_min;
uniform float u_max_rayleigh_shadow_length;

uniform sampler2D u_transmittance_texture;
uniform sampler3D u_scattering_texture;
uniform sampler3D u_single_mie_scattering_texture;
uniform sampler2D u_irradiance_texture;