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