Fix cmake issue with osgEarthImGui where find_dependency was not call…

…ed for GLEW or OpenGL

cmake/osgEarth-config.cmake.in

@@ -1,8 +1,16 @@
 #
-# CMake Config TEMPLATE
-# Inputs:
+# osgEarth CMake Config
+#
+# Developer inputs:
 #    OSGEARTH_VERSION : osgEarth version string
 #    OSGEARTH_COMPONENTS : list of libraries for which to create namespaced imports
+#    OSGEARTH_PUBLIC_DEPENDENCIES : list of libraries for which to generate find_dependency
+#
+# User outputs:
+#    osgEarth::osgEarth import library (and one for each additonal nodekit)
+#    osgEarth_FOUND : true if successful
+#    osgEarth_INCLUDE_DIR : include root
+#    osgEarth_SHARE_DIR : location of share folder containing cmake files and external resources
 #
 cmake_minimum_required(VERSION 3.10.0)
 
@@ -24,10 +32,13 @@ set_and_check(osgEarth_BUILD_DIR "${PACKAGE_PREFIX_DIR}")
 # always depend on the public-facing OSG libraries
 include(CMakeFindDependencyMacro)
 find_dependency(OpenSceneGraph REQUIRED COMPONENTS osg osgDB osgGA osgUtil osgViewer OpenThreads)
-
-# must foreably include the OSG include root
 include_directories(${OPENSCENEGRAPH_INCLUDE_DIR})
 
+# additional public dependencies
+foreach(MY_DEPENDENCY @OSGEARTH_PUBLIC_DEPENDENCIES@)
+    find_dependency(${MY_DEPENDENCY} REQUIRED)
+endforeach()
+
 # include the target for each library in OSGEARTH_COMPONENTS:
 foreach(MY_COMPONENT @OSGEARTH_COMPONENTS@)
     if(NOT TARGET osgEarth::${MY_COMPONENT})

src/CMakeLists.txt

@@ -3,9 +3,15 @@
 set(OSGEARTH_COMPONENTS)
 list(APPEND OSGEARTH_COMPONENTS osgEarth)
 
+# A list of public-facing dependencies for the packaging targets
+set(OSGEARTH_PUBLIC_DEPENDENCIES)
+
+
 if(OSGEARTH_BUILD_IMGUI_NODEKIT)
     add_subdirectory(osgEarthImGui)
     list(APPEND OSGEARTH_COMPONENTS osgEarthImGui)
+    list(APPEND OSGEARTH_PUBLIC_DEPENDENCIES GLEW)
+    list(APPEND OSGEARTH_PUBLIC_DEPENDENCIES OpenGL)
 endif()
 
 if(OSGEARTH_BUILD_PROCEDURAL_NODEKIT)

src/osgEarthImGui/CMakeLists.txt

@@ -58,5 +58,5 @@ add_osgearth_library(
     TARGET ${LIB_NAME}
     SOURCES ${LIB_SOURCES} ${IMGUI_SOURCES}
     PUBLIC_HEADERS ${LIB_HEADERS} ${IMGUI_HEADERS} ${STOCK_PANELS}
-    LIBRARIES PRIVATE GLEW::GLEW OpenGL::GL
+    LIBRARIES PUBLIC GLEW::GLEW OpenGL::GL
     FOLDER "NodeKits")