add backend_test for sdl2 opengl3

backend_test/CMakeLists.txt

@@ -0,0 +1,80 @@
+Project(cimgui_sdl)
+cmake_minimum_required(VERSION 2.8)
+if(WIN32) #to mingw work as all the others
+set(CMAKE_SHARED_LIBRARY_PREFIX "")
+endif(WIN32)
+#general settings
+include_directories(../imgui)
+add_definitions("-DIMGUI_DISABLE_OBSOLETE_FUNCTIONS=1")
+
+include_directories(../)
+set(IMGUI_SOURCES ../cimgui.cpp 
+../imgui/imgui.cpp 
+../imgui/imgui_draw.cpp 
+../imgui/imgui_demo.cpp 
+../imgui/imgui_widgets.cpp 
+)
+
+set(IMGUI_SOURCES_sdl)
+set(IMGUI_LIBRARIES )
+
+if (WIN32)
+    add_definitions("-DIMGUI_IMPL_API=extern \"C\" __declspec\(dllexport\)")
+else(WIN32)
+    add_definitions("-DIMGUI_IMPL_API=extern \"C\" ")
+endif(WIN32)
+
+add_compile_definitions("IMGUI_IMPL_OPENGL_LOADER_GL3W")
+
+#optional adding freetype
+option(IMGUI_FREETYPE "add Freetype2" OFF)
+
+if(IMGUI_FREETYPE)
+	FIND_PACKAGE(freetype REQUIRED PATHS ${FREETYPE_PATH})
+	list(APPEND IMGUI_LIBRARIES freetype)
+	list(APPEND IMGUI_SOURCES ../imgui/misc/freetype/imgui_freetype.cpp)
+	add_definitions("-DCIMGUI_FREETYPE=1")
+endif(IMGUI_FREETYPE)
+
+#opengl3
+list(APPEND IMGUI_SOURCES ../imgui/examples/imgui_impl_opengl3.cpp ../imgui/examples/libs/gl3w/GL/gl3w.c)
+list(APPEND IMGUI_SOURCES ./cimgui_extras.cpp)
+include_directories(../imgui/examples/libs/gl3w)
+if(WIN32)
+       list(APPEND IMGUI_LIBRARIES opengl32)
+else(WIN32)#Unix
+       list(APPEND IMGUI_LIBRARIES GL)
+endif(WIN32)
+
+
+#sdl2
+list(APPEND IMGUI_SOURCES ../imgui/examples/imgui_impl_sdl.cpp)
+if(DEFINED SDL_PATH)
+	message(STATUS "SDL_PATH defined as " ${SDL_PATH})
+	FIND_PACKAGE(SDL2 REQUIRED PATHS ${SDL_PATH})
+	get_target_property(SDL_INCLUDE SDL2::SDL2 INTERFACE_INCLUDE_DIRECTORIES)
+	message(STATUS "sdlinclude is " ${SDL_INCLUDE})
+	if ("${SDL_INCLUDE}" STREQUAL "") #if not found latest SDL2 cmake config use older
+		message(STATUS "sdlinclude2 is " ${SDL2_INCLUDE_DIRS})
+		include_directories(${SDL2_INCLUDE_DIRS})
+		set(IMGUI_SDL_LIBRARY ${SDL2_LIBRARIES})
+		message(STATUS IMGUI_SDL_LIBRARY ${SDL2_LIBRARIES})
+	else()#use new one SDL2 config
+		include_directories(${SDL_INCLUDE})
+		set(IMGUI_SDL_LIBRARY SDL2::SDL2)
+		set(SDL_MAIN SDL2::SDL2main)
+		message(STATUS ${SDL_MAIN} ${IMGUI_SDL_LIBRARY})
+	endif()
+else(DEFINED SDL_PATH)
+	message(STATUS "SDL_PATH not defined")
+	set(IMGUI_SDL_LIBRARY SDL2)
+endif(DEFINED SDL_PATH)
+
+add_library(cimgui_sdl SHARED ${IMGUI_SOURCES})
+target_link_libraries(cimgui_sdl ${IMGUI_LIBRARIES} ${IMGUI_SDL_LIBRARY})
+
+#using library
+include_directories(../generator/output/)
+add_executable(test_sdl main.c ../imgui/examples/libs/gl3w/GL/gl3w.c)
+target_link_libraries(test_sdl ${IMGUI_SDL_LIBRARY} cimgui_sdl)
+