enum game_mode_flags must be visible in common code, which does not
define DXX_BUILD_DESCENT_II. To avoid One Definition Rule errors,
game_mode_flags must have the same definition in all files.
Fortunately, the DXX_BUILD_DESCENT_II definition is a superset of the
common definition, so the preprocessor guards can be replaced with
advisory comments.
Fixes: 2b718da343 ("Use enum class for Game_mode, Newdemo_game_mode")
Change it from the level number on which the path was created to a
true/false flag. The previous logic only tested whether the number was
equal to the current level number.
This also fixes a bug where the action was not available on the first
secret level, since that level is `-1`, and the value was set to `-1` to
indicate that it should be enabled.
Enable stereo mode when launched via -gl_stereo option.
GL_STEREO quad buffering may not be available unless OGL layer
supports stereo pixel format descriptors.
Half-height viewport rendering for above/below format.
Half-width viewport rendering for side/by/side formats.
HUD & cockpit elements disabled when stereo views active.
Various sites assign GM_GAME_OVER to Game_mode, but no sites test for
it. Its only value would be to clear out other flags, but that can be
done by clearing Game_mode.
Difficulty_level_type is used in arithmetic expressions. If
Difficulty_level_type is unsigned, then those expressions use unsigned
terms, but some of the expressions were designed to use signed terms and
produce incorrect results when used with unsigned terms. There is no
strong reason to make Difficulty_level_type unsigned, so switch it to
signed instead of trying to fix every site that uses it.
Reported-by: AlumiuN <https://github.com/dxx-rebirth/dxx-rebirth/issues/471>
Fixes: 1eaaff3016 ("Move Difficulty_level to GameUniqueState")
The number of hostages in a game is a function of the the game's levels,
not any particular player. Move it to d_game_unique_state and rename it
to total_hostages.
The number of robots accumulated in a game is a function of the the
game's levels, not any particular player. Move it to
d_game_unique_state and rename it to accumulated_robots.
