IgnOGRE2 support for ogre-next in Ubuntu Jammy

[j-rivero]

Ubuntu jammy provides a libogre-next package that ships a custom CMake helper that can potentially work mostly on its own (see the patch used for ign-rendering code).

Desired behavior

IgnOGRE2 to support the Ubuntu Jammy ogre-next installation.

Alternatives considered

Until now, the alternative is to patch code to avoid IgnOGRE2 and use CMake diretly.

Implementation suggestion

Try to support the Ubuntu jammy versions transparently with the other installations existing out there.

Additional context

The root of the problem is the design of OGRE-Next to be an embedded piece of software inside other projects. This is hard to workaround and the origin of the IgnOGRE2 module.

[scpeters]

something seems odd about the cmake version detection for libogre-next-dev. I just tried configuring cmake on a 22.04 container with a small patch to search for the OGRE-Next cmake package, and I see the following, noting the version: unknown:

diff --git a/CMakeLists.txt b/CMakeLists.txt
index c0b903d0..a19804b0 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -97,7 +97,7 @@ endif()
 
 #--------------------------------------
 # Find OGRE2
-ign_find_package(IgnOGRE2 VERSION 2.2.0
+ign_find_package(OGRE-Next VERSION 2.2.0
     COMPONENTS HlmsPbs HlmsUnlit Overlay
     REQUIRED_BY ogre2
     PRIVATE_FOR ogre2)

CMake Warning at /usr/share/cmake/ignition-cmake2/cmake2/IgnUtils.cmake:189 (find_package):
  Could not find a configuration file for package "OGRE-Next" that is
  compatible with requested version "2.2.0".

  The following configuration files were considered but not accepted:

    /usr/lib/x86_64-linux-gnu/cmake/OGRE-Next/OGRE-NextConfig.cmake, version: unknown
    /lib/x86_64-linux-gnu/cmake/OGRE-Next/OGRE-NextConfig.cmake, version: unknown