Added a dedicated FindEGL.cmake script to help with locating the EGL.so library and header

CMakeLists.txt

@@ -273,7 +273,6 @@ IF(APPLE)
         # libosgViewer would use X11/OpenGL, which causes compatibility
         # issues for applications using OSG.
         UNSET(OPENGL_gl_LIBRARY CACHE)
-        UNSET(OPENGL_glu_LIBRARY CACHE)
         UNSET(OPENGL_INCLUDE_DIR CACHE)
         IF(OSG_WINDOWING_SYSTEM STREQUAL "X11")
           FIND_PACKAGE(X11)
@@ -284,7 +283,6 @@ IF(APPLE)
           # Use X11 version of OpenGL as seed for CMake FindOpenGL
           GET_FILENAME_COMPONENT(X11LIBDIR ${X11_X11_LIB} DIRECTORY)
           FIND_LIBRARY(OPENGL_gl_LIBRARY GL PATHS ${X11LIBDIR} DOC "OpenGL lib for OSX" NO_DEFAULT_PATH)
-          FIND_LIBRARY(OPENGL_glu_LIBRARY GLU PATHS ${X11LIBDIR} DOC "GLU lib for OSX" NO_DEFAULT_PATH)
           SET(OPENGL_INCLUDE_DIR ${X11_INCLUDE_DIR} CACHE PATH "Include for OpenGL on OSX" FORCE)
 
         ELSEIF(OSG_WINDOWING_SYSTEM STREQUAL "Carbon")
@@ -293,6 +291,7 @@ IF(APPLE)
         ENDIF()
 
         FIND_PACKAGE(OpenGL)
+        FIND_PACKAGE(EGL)
     ENDIF ()
 
     OPTION(OSG_COMPILE_FRAMEWORKS "compile frameworks instead of dylibs (experimental)" OFF)
@@ -300,6 +299,7 @@ IF(APPLE)
 ELSE()
     # Non-Apple: Find OpenGL
     FIND_PACKAGE(OpenGL)
+    FIND_PACKAGE(EGL)
 ENDIF()
 ENDIF()
 
@@ -509,8 +509,6 @@ ENDIF()
 
 OPTION(OSG_GL_LIBRARY_STATIC "Set to ON to statically link with OpenGL/GLES library." OFF)
 
-SET(OPENGL_egl_LIBRARY CACHE STRING "Set the OpenGL egl library.")
-
 # Map the OSG_GL*_AVAILABLE settings to OSG_GL_* settings
 IF (OSG_GLES2_AVAILABLE OR OSG_GL3_AVAILABLE)
     OPTION(OSG_GL_DISPLAYLISTS_AVAILABLE "Set to OFF to disable use of OpenGL display lists." OFF)

CMakeModules/FindEGL.cmake

@@ -0,0 +1,33 @@
+# Finds EGL header and library
+#
+# This script defines the following:
+#  EGL_FOUND // Set to TRUE if EGL is found
+#  EGL_INCLUDE_DIR // Parent directory of directory EGL/egl.h header.
+#
+# EGL_DIR can be set as an environment variable or a CMake variable,
+# to the parent directory of the EGL header.
+#
+
+
+FIND_PATH( EGL_INCLUDE_DIR
+    NAMES EGL/egl.h
+    HINTS ENV EGL_DIR
+)
+
+FIND_LIBRARY(EGL_LIBRARY
+    NAMES EGL
+    HINTS ENV EGL_DIR
+    PATH_SUFFIXES lib
+)
+
+# handle the QUIETLY and REQUIRED arguments and set
+# EGL_FOUND to TRUE as appropriate
+INCLUDE( FindPackageHandleStandardArgs )
+
+FIND_PACKAGE_HANDLE_STANDARD_ARGS(EGL
+                                  REQUIRED_VARS EGL_LIBRARY EGL_INCLUDE_DIR)
+
+MARK_AS_ADVANCED(
+    EGL_INCLUDE_DIR
+    EGL_LIBRARY
+)

CMakeModules/OsgMacroUtils.cmake

@@ -82,8 +82,8 @@ ENDMACRO(LINK_EXTERNAL TRGTNAME)
 MACRO(LINK_CORELIB_DEFAULT CORELIB_NAME)
     #SET(ALL_GL_LIBRARIES ${OPENGL_LIBRARIES})
     SET(ALL_GL_LIBRARIES ${OPENGL_gl_LIBRARY})
-    IF (OSG_GLES1_AVAILABLE OR OSG_GLES2_AVAILABLE)
+    IF (OSG_GLES1_AVAILABLE OR OSG_GLES2_AVAILABLE OR OSG_GLES3_AVAILABLE)
-        SET(ALL_GL_LIBRARIES ${ALL_GL_LIBRARIES} ${OPENGL_egl_LIBRARY})
+        SET(ALL_GL_LIBRARIES ${ALL_GL_LIBRARIES} ${EGL_LIBRARY})
     ENDIF()
 
     LINK_EXTERNAL(${CORELIB_NAME} ${ALL_GL_LIBRARIES})
@@ -133,8 +133,8 @@ MACRO(SETUP_LINK_LIBRARIES)
 
     #SET(ALL_GL_LIBRARIES ${OPENGL_LIBRARIES})
     SET(ALL_GL_LIBRARIES ${OPENGL_gl_LIBRARY})
-    IF (OSG_GLES1_AVAILABLE OR OSG_GLES2_AVAILABLE)
+    IF (OSG_GLES1_AVAILABLE OR OSG_GLES2_AVAILABLE OR OSG_GLES3_AVAILABLE)
-        SET(ALL_GL_LIBRARIES ${ALL_GL_LIBRARIES} ${OPENGL_egl_LIBRARY})
+        SET(ALL_GL_LIBRARIES ${ALL_GL_LIBRARIES} ${EGL_LIBRARY})
     ENDIF()
 
 #    FOREACH(LINKLIB ${TARGET_LIBRARIES})