Fixed static reflection map being black.

[ohlidalp]

Intro

we have 2 cvars (RoR.cfg entries):

• gfx_envmap_enabled("Reflections"): bool - if true, reflections are dynamically updated. If false, they're static but still visible (counter intuitive but classic behavior).
• gfx_envmap_rate("ReflectionUpdateRate"): integer, 0-6: how many of the 6 dynamic textures to update every frame? 0 is equivalent to "Reflections=No" in RoR.cfg. This has severe impact on FPS.

Problem

With "Reflections=No", the reflection map was black. This caused reflective surfaces to be very dark.

Solution

Even if disabled in config, the realtime envmap is fully rendered once after loading terrain, to provide static reflections.

Kudos to NegativeIce for reporting!

[tritonas00]

Works fine. Merging so Neg can test also.

[tritonas00]

With "Reflections=No", the reflection map was black.

Was actually:

With "Reflections=Yes , ReflectionUpdateRate=0", the reflection map was black.