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

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)
-        SET(ALL_GL_LIBRARIES ${ALL_GL_LIBRARIES} ${OPENGL_egl_LIBRARY})
+    IF (OSG_GLES1_AVAILABLE OR OSG_GLES2_AVAILABLE OR OSG_GLES3_AVAILABLE)
+        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)
-        SET(ALL_GL_LIBRARIES ${ALL_GL_LIBRARIES} ${OPENGL_egl_LIBRARY})
+    IF (OSG_GLES1_AVAILABLE OR OSG_GLES2_AVAILABLE OR OSG_GLES3_AVAILABLE)
+        SET(ALL_GL_LIBRARIES ${ALL_GL_LIBRARIES} ${EGL_LIBRARY})
     ENDIF()
 
 #    FOREACH(LINKLIB ${TARGET_LIBRARIES})