also accept newer versions of glslang

Author: aumuell

CMakeLists.txt

@@ -339,7 +339,12 @@ if (NOT COVISE_BUILD_ONLY_FILE)
 	covise_find_package(Freetype)
 	covise_find_package(CURL)
     if (NOT COVISE_BUILD_ONLY_ODDLOT AND NOT COVISE_BUILD_ONLY_COVER)
-        covise_find_package(glslang 15 CONFIG)
+        foreach(v 20 19 18 17 16 15)
+          covise_find_package(glslang ${v} CONFIG QUIET)
+          if (TARGET glslang::glslang)
+            break()
+          endif()
+        endforeach()
         covise_find_package(Vulkan 1.1.70)
         covise_find_package(vsg 1.1.4 CONFIG)
         covise_find_package(vsgXchange 1.0.5 CONFIG)