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e2e8a690cd
Find GLVND components if available. Add `GLX` and `EGL` options for COMPONENTS that allow requesting these libraries explicitly. Introduce new import targets for these windowing-system-specific libraries. On a GLVND system, populate the legacy `OPENGL_LIBRARIES` variable and the `OpenGL::GL` target using the `OpenGL` and `GLX` components. On non-GLVND systems, continue to use the legacy `GL` library and simply do not provide the GLVND components. Application code can choose to adapt based on the availability of GLVND components as imported targets.
71 lines
2.6 KiB
CMake
71 lines
2.6 KiB
CMake
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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