Draw volumetric clouds, their shadows, a volumetric fog and catalogue stars from a new weather system in the GL 4.6 renderer

environment/starcatalog.h

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+/*
+This Source Code Form is subject to the
+terms of the Mozilla Public License, v.
+2.0. If a copy of the MPL was not
+distributed with this file, You can
+obtain one at
+http://mozilla.org/MPL/2.0/.
+*/
+
+#pragma once
+
+#include <cstddef>
+#include <cstdint>
+
+// the stars of the night sky: the Yale Bright Star Catalogue, 5th revised edition (Hoffleit & Warren, 1991), every star with a
+// position and a visual magnitude, about down to magnitude 6.5. positions for the equinox J2000
+struct catalogue_star
+{
+	std::uint16_t right_ascension; // hundredths of a degree, 0-36000
+	std::int16_t declination; // hundredths of a degree, -9000-9000
+	std::int16_t magnitude; // visual magnitude, hundredths
+	std::int16_t temperature; // colour temperature, tens of kelvins
+};
+
+namespace star_catalogue
+{
+
+catalogue_star const *stars();
+std::size_t size();
+
+} // namespace star_catalogue