Avoids switching cockpit views to CM_LETTERBOX when player dies or
level ends which stereo viewport is active, as well as other calls
to select_cockpit().
When player gets killed, the screen inexplicably switches to
another viewport format to show explosion POV and then switches
to cockpit viewport, which is not compatible with stereo formats.
Unable to locate where exactly cockpit gets switched on player
dead state, so hack is in place to keep stereo formats fullscreen.
Used 1x VR_eye_offset to track image shift adjustments via OGL frustum planes
instead of 2x VR_eye_offset used in Descent 1.5 image shift adjustments.
Without any HUD rect offset, HUD overlays would appear to match the zero-parallax
view plane instead of appearing in an out-of-screen parallax view plane.
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.
clang warns for an unused constexpr global variable. gcc does not.
Move the affected variable into the same #if that guards the use of the
variable.
Fixes: 4a8d7c7574 ("Default to 1024x768 for new users, not 640x480")
640x480 is too small to render some dialogs correctly, and is much
smaller than even a small laptop screen. Smaller resolutions are still
supported, if the user chooses to switch.
When joystick support is not present, `event_joystick_get_button` is not
declared in joy.h.
Fixes: c24864b180 ("make menus controllable with joystick")
Define separate enum values for rotation data in both the high bits,
where it is usually kept, and the low bits, where it is sometimes used
for math or comparisons.
Define an enum value to represent the composite of the index and the
rotation, since the composite is not suitable for use as an array
subscript. Add helper functions to extract the component pieces.
segment inherits unique_segment, so unique_segment members can be
referenced from an instance of segment. Eventually, segment will be
removed. Adjust references to go through unique_segment to support this
change.
gcc and clang disagree about how to disambiguate when an identifier is
both a typename and a member. Avoid the disagreement by renaming the
member.
Reported-by: Kreeblah <https://github.com/dxx-rebirth/dxx-rebirth/issues/532>
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.
