cleanup opengl import - confine to gfx module

CMakeLists.txt

-cmake_minimum_required(VERSION 3.10)
+cmake_minimum_required(VERSION 3.13)
 
 project(FGGL VERSION 0.1 LANGUAGES CXX)
 
@@ -13,8 +13,9 @@ set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
 find_package( glfw3 )
 if ( NOT glfw3_FOUND )
   include(FetchContent)
-  set(GLFW_BUILD_EXAMPLES OFF)
-  set(GLFW_BUILD_TESTS OFF)
+  set(GLFW_BUILD_DOCS OFF CACHE BOOL "" FORCE)
+  set(GLFW_BUILD_TESTS OFF CACHE BOOL "" FORCE)
+  set(GLFW_BUILD_EXAMPLES OFF CACHE BOOL "" FORCE)
   if ( FGGL_WAYLAND )
     set(GLFW_USE_WAYLAND True)
   endif ()

fggl/CMakeLists.txt

@@ -14,7 +14,7 @@ target_include_directories(fggl PUBLIC ${CMAKE_CURRENT_SOURCE_DIR}/../)
 
 # Graphics backend
 add_subdirectory(gfx)
-target_link_libraries(fggl glfw ${OPENGL_gl_LIBRARY} GLEW)
+target_link_libraries(fggl glfw)
 
 # Debug backend
 add_subdirectory(debug)

fggl/gfx/CMakeLists.txt

@@ -2,6 +2,7 @@
 # OpenGL Backend
 find_package( OpenGL REQUIRED )
 include_directories( ${OPENGL_INCLUDE_DIR} )
+target_link_libraries(fggl OpenGL::OpenGL GLEW)
 
 # GLEW
 find_package( GLEW REQUIRED )