CMake 3.15+ provides the former, which extension modules should link
against in order to ensure the ABI-appropriate linkage for the
platform.
For older versions of CMake, try to hack up the correct linkage for
the platform. If the platform isn't recognized, tell the user to
upgrade CMake.
This also tweaks p3pystub just a bit, since now it's actually relied
upon to resolve runtime link issues when p3dcparse pulls in direct,
as p3dcparse doesn't link against Python at all.
This should especially help with trimesh generation performance, which previously formatted a complete description of the trimesh to the debug output even if it was disabled.
The _render_stages and _render_ff_stages cannot simply be copied, because they contain pointer references to the previous TextureAttrib. Never copy them, and always mark _sort_seq as stale.
This fixes a test failure in replace_texture.
This is particularly the case when requesting a core-only profile (gl-version 3 2) where luminance textures are deprecated.
There is apparently no way to emulate them with swizzles (as we do with luminance textures), so we'll have to duplicate the channels out.
Fixes#693
Previously it was only possible to set this in the default-loaded Config.prc file; now it is possible to set this at any time, though it can only be set once from its default value and not changed after it has already been set to something other than the default value.
These should be protected by an is_debug() check so that they can be optimized out properly in a release build. Setting check-debug-notify-protect in Config.prc can be used to track down cases of missed checks.
A task returning DS_interrupt would only interrupt the current task chain, not the entire task manager. This meant that other tasks might get run with an exception state set, causing the exception state to get stomped on or the Python interpreter to complain.
Fixes#692
