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cmake_minimum_required(VERSION 3.9)
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project(TestFindOpenGL C)
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include(CTest)
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find_package(OpenGL REQUIRED)
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# import target for GLU
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add_executable(test_tgt main.c)
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target_link_libraries(test_tgt OpenGL::GLU)
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add_test(NAME test_tgt COMMAND test_tgt)
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# OPENGL_LIBRARIES should be whatever libraries are needed to link.
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add_executable(test_var main.c)
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target_include_directories(test_var PRIVATE ${OPENGL_INGLUDE_DIRS})
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target_link_libraries(test_var PRIVATE ${OPENGL_LIBRARIES})
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add_test(NAME test_var COMMAND test_var)
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# VND support adds an ::OpenGL import target. This can be used for OpenGL-only
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# code (code that does not manipulate contexts, like our 'main.c'). Without
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# VND, ::GL can be used for both context and non-context OpenGL code.
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if(OpenGL_TEST_VND)
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add_executable(test_comp_none main.c)
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target_link_libraries(test_comp_none PRIVATE OpenGL::OpenGL)
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add_test(NAME test_comp_none COMMAND test_comp_none)
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else()
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add_executable(test_comp_none main.c)
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target_link_libraries(test_comp_none PRIVATE OpenGL::GL)
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add_test(NAME test_comp_none COMMAND test_comp_none)
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endif()
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# GLX
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if(OpenGL_TEST_VND)
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find_package(OpenGL REQUIRED COMPONENTS OpenGL GLX)
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add_executable(test_comp_glx main.c)
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target_link_libraries(test_comp_glx PRIVATE OpenGL::OpenGL OpenGL::GLX)
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add_test(NAME test_comp_glx COMMAND test_comp_glx)
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else()
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# non-VND systems won't have it, but an optional search for GLX should still
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# be okay.
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find_package(OpenGL COMPONENTS GLX)
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add_executable(test_comp_glx_novnd main.c)
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target_link_libraries(test_comp_glx_novnd PRIVATE OpenGL::GL)
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add_test(NAME test_comp_glx_novnd COMMAND test_comp_glx_novnd)
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endif()
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# EGL is only available on Linux+GLVND at present.
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if(OpenGL_TEST_VND)
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find_package(OpenGL COMPONENTS OpenGL EGL)
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if(OpenGL_EGL_FOUND)
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add_executable(test_comp_egl main.c)
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target_link_libraries(test_comp_egl PRIVATE OpenGL::OpenGL OpenGL::EGL)
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add_test(NAME test_comp_egl COMMAND test_comp_egl)
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# EGL-only code should not link to GLX.
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execute_process(COMMAND ldd test_comp_egl
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OUTPUT_VARIABLE LDD_OUT
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ERROR_VARIABLE LDD_ERR)
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if("${LDD_OUT}" MATCHES "GLX")
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message(FATAL_ERROR "EGL-only code links to GLX!")
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endif()
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endif()
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# all three COMPONENTS together.
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find_package(OpenGL COMPONENTS OpenGL EGL GLX)
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if(OpenGL_EGL_FOUND AND OpenGL_GLX_FOUND)
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add_executable(test_comp_both main.c)
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target_link_libraries(test_comp_both PRIVATE OpenGL::OpenGL OpenGL::EGL
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OpenGL::GLX)
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add_test(NAME test_comp_both COMMAND test_comp_both)
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endif()
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endif()
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