https://bugs.freedesktop.org/show_bug.cgi?id=55510
--- Comment #6 from Vadim Girlin ptpzz@yandex.ru --- Unigine has some known problems, so you need to set the following environment variable to activate workarounds in mesa:
force_glsl_extensions_warn=true
This should be enough for Tropics and Sanctuary IIRC, Heaven additionally requires
MESA_EXTENSION_OVERRIDE=-GL_ARB_shader_bit_encoding