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

shaders/stars.frag

@@ -0,0 +1,26 @@
+// a star: a soft point added to the sky
+
+in vec3 f_color;
+
+#include <common>
+#include <tonemapping.glsl>
+
+layout(location = 0) out vec4 out_color;
+#if MOTIONBLUR_ENABLED
+layout(location = 1) out vec4 out_motion;
+#endif
+
+void main()
+{
+	vec2 offset = gl_PointCoord - 0.5;
+	float spot = exp(-dot(offset, offset) * 14.0);
+	vec3 color = f_color * spot;
+#if POSTFX_ENABLED
+	out_color = vec4(color, 0.0);
+#else
+	out_color = vec4(tonemap(vec4(color, 1.0)).rgb, 0.0);
+#endif
+#if MOTIONBLUR_ENABLED
+	out_motion = vec4(0.0);
+#endif
+}