[CMake] Compiling OpenGL application with CMake

[Andrea Tagliasacchi]

Hello everybody,

I have given up on Makefiles, implicit rules and unreadability just annoyed
me.
Also the ability of generating cross platform compile files is very
appealing.

As far as I compile my independent code (no external libraries)
everything goes fine. However, one of my applications is a simple
OpenGL based visualizer and I am having problems finding the correct
set of setting of the CMakeLists.txt.

Right now I hacked a *temporary solution* that compiles that file
in an architecture dependent way:

find_package(GLUT)
find_package(OpenGL)
IF(APPLE)
    SET(CMAKE_CXX_LINK_FLAGS "-framework OpenGL -framework GLUT")
    ADD_EXECUTABLE(mesh_view mesh_view.cpp)
ENDIF(APPLE)

Browsing around I was able to construct the following but I am still getting

linking errors as reported below:

find_package(GLUT)
find_package(OpenGL)
if (OPENGL_FOUND)
   MESSAGE("OpenGL Correctly Found")
   include_directories(${OPENGL_INCLUDE_DIR})
else (OPENGL_FOUND)
   MESSAGE("OpenGL environment missing")
endif (OPENGL_FOUND)

Example of linking errors:
Linking CXX executable mesh_view
Undefined symbols:
  "_glViewport", referenced from:
      reshapeCallback(int, int)in mesh_view.cpp.o
  "_glMaterialfv", referenced from:
      displayCallback()     in mesh_view.cpp.o
  "_glLoadIdentity", referenced from:
      init_opengl()     in mesh_view.cpp.o
      motionCallback(int, int)in mesh_view.cpp.o
      displayCallback()     in mesh_view.cpp.o

I also checked the CMake files of OpenSceneGraph
but I can find only include directory specifications, no linking.

Browsing around I also found the following but even if I add them nothing
changes:
INCLUDE(${CMAKE_ROOT}/Modules/FindOpenGL.cmake)
SET(CMAKE_REQUIRED_LIBRARIES ${GLUT_LIBRARY} ${GL_LIBRARY})
LINK_DIRECTORIES(${OPENGL_LIBRARIES})

Any suggestion?

Really appreciated.
--
Andrea Tagliasacchi
Ph.D. Candidate
School of Computer Science
Simon Fraser University
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