Note since ogl_stereo_frame() is only ever called once per ogl_start_frame()..
ogl_end_frame() instance, only the active stereo eye view needs to be handled.
Implies that separate left/right viewport/transform caches are redundant.
Equivalent to legacy Descent 1.5 pixel shift methods for stereo formats.
Since Descent is rendering viewpoint differences for left/right eyes,
pixel shifting via display viewport is sufficient adjustment.
Since OGL layer here is essentially handling display output surfaces,
the OGL projection transform is not useful for stereo parallax effects
as when used for 3D scenes.
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.
OGL layer used for rendering surfaces, so using left/right viewports absent stereo quad buffers.
Using legacy Descent +/- eye offset method for left/right stereo perspective rendering passes.
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.
Normally, this shouldn't matter, and on almost all
OpenGL drivers out there, it really doesn't, but
the Raspberry Pi 4's "V3D" Mesa driver behaves
differently: It simply won't draw any lines as long
as GL_CULL_FACE is enabled, so we need to disable
it.
Similar to 09eff19a66, _g3_draw_poly can
store the control information on the stack to avoid an allocation, since
the total size is bounded and relatively small.
Similar to 09eff19a66, _g3_draw_tmap_2 can
store the control information on the stack to avoid an allocation, since
the total size is bounded and relatively small.
gcc permits this, but clang complains. Match the format specifier to
the type of the underlying temporary variable.
Fixes: a65068fed1 ("Move OGL RLE bitmap buffer to stack")
Shrink it from 1MB to 300KB. Add a diagnostic if the expansion fails
due to insufficient capacity.
300KB is required for the ship cockpit bitmap. Everything else seems to
be smaller.
For each link given as http://, verify that the site is accessible over
https:// and, if so, switch to it. These domains were converted:
* llvm.org
* clang.llvm.org
* en.cppreference.com
* www.dxx-rebirth.com
* www.libsdl.org
* www.scons.org
Using sizeof(con_printf A) was a trick to avoid code generation, but it
interacts badly with gcc-6 and the other macros that con_printf
produces. On >=gcc-6, `DXX_ALWAYS_ERROR_FUNCTION` is a complicated hack
to work around undesirable changes in `__builtin_constant_p`. That hack
includes introducing a dummy type. gcc-6 rejects declaring a type
inside a statement expression inside a sizeof. gcc-7 permits this, so
it went unnoticed.
This particular usage was to prevent future regressions in calls that
had been broken for years without anyone noticing. As such, reverting
to not checking those calls is unlikely to matter.
Reported-by: Ambaire <https://github.com/dxx-rebirth/dxx-rebirth/issues/393#issuecomment-401565872>
Fixes: 9b17450914 ("Fix up long broken glmprintf support")
[Kp: as discussed in pull #377
<https://github.com/dxx-rebirth/dxx-rebirth/pull/377>, the previous
implementation requested a parameter combination not permitted by
OpenGL. At best, this error was silently ignored. Fix the error by
falling through to a switch case statement that sets valid parameters.]
Rather than use an inline wrapper and rely on the compiler optimizer to
redirect gr_set_current_canvas(nullptr) to gr_set_default_canvas,
rewrite all relevant calls directly in the source.
git grep -l 'gr_set_current_canvas' | xargs sed -i -e 's:gr_set_current_canvas(\s*NULL\|nullptr\s*);:gr_set_default_canvas();:'
