Add LEFT_BIT and RIGHT_BIT node masks, which are only shown on the left
or right viewports. These will be used for eye specific visibility masks
with VR.
To allow for custom compositors and passes created by C++ code alongside
those created by Compositor::create(), add a resetOrderOffset() function
which resets _order_offset back to zero. This will allow FlightGear to
prevent repeated compositor reloads from increasing _order_offset
indefinitely, which soon results in render orders beyond those set
statically for the GUI and upcoming VR mirror compositors.
The Canvas camera and texture get recreated in several circumstances.
Calling .release() on a ref_ptr will just return the raw pointer and
'delete' won't be called. The proper way to explicitly delete an object
managed by a ref_ptr is to set the ref_ptr to NULL. This will delete it
as long as it's not referenced by any other ref_ptr.
If we have an uncallable object error, also show the type and value of the
uncallable object.
To make this work, have upgraded simgear/nasal/lib.c:dosprintf() to be globally
available. Could perhaps rename it and declare in a different header. But it's
C so we don't want to make it part of simgear's general utility functions.
These formats are not defined by OSG, so we manually define them. Some GPUs might not support them as we are using a GL compatibility context, but it shouldn't matter for now as they are only being used by the HDR pipeline.
Previously on my system, generating vegetation for a given tile
took 0.15-0.2s (for ~ 56k positions), of ~0.4s. While this is done in a
separate loading thread, the sheer number of tiles being loaded
caused noticeable delays and popping of higher LoD tiles.
As a tile at the highest LoD is typically 6x6km, and vegetation
is generated on a scanline of individual triangles, there is a _lot_
of temporal locality on the landclass of a series of points.
By caching the material information required from the landclass lookup
we can avoid a whole much of material lookups for each successive
vegetation point.
On my system this reduced the time to generate vegetation down to
0.02s per tile, and total tile generation time down to ~0.2s.
Added support for seeking (forwards only) - in ZlibAbstractIStreambuf, added
seekoff().
Also disabled assert that checked that we reach EOF compressed data at same
time as EOF uncompressed data; was breaking things when using embedded
compressed streams within fgtape recording.
Added ZLibCompressionFormat::ZLIB_RAW, uses windowBits=-15, for zlib compressed
streams without header or trailer.
Fixed clang build error with std::min().
