[#26] Added STB as dependency for texture loading later on

Signed-off-by: Tobias Frisch <tfrisch@uni-koblenz.de>

.gitmodules

@@ -7,3 +7,6 @@
 [submodule "modules/asset_loader/lib/json"]
 	path = modules/asset_loader/lib/json
 	url = https://github.com/nlohmann/json.git
+[submodule "modules/asset_loader/lib/stb"]
+	path = modules/asset_loader/lib/stb
+	url = https://github.com/nothings/stb.git

modules/asset_loader/CMakeLists.txt

@@ -27,8 +27,14 @@ include(config/NLOHMANN_JSON.cmake)
 # Check and load FX-GLTF
 include(config/FX_GLTF.cmake)
 
+# Check and load STB
+include(config/STB.cmake)
+
 # link the required libraries to the module
 target_link_libraries(vkcv_asset_loader ${vkcv_asset_loader_libraries})
 
+# including headers of dependencies and the VkCV framework
+target_include_directories(vkcv_asset_loader SYSTEM BEFORE PRIVATE ${vkcv_asset_loader_includes})
+
 # add the own include directory for public headers
 target_include_directories(vkcv_asset_loader BEFORE PUBLIC ${vkcv_asset_loader_include})

modules/asset_loader/config/STB.cmake

+
+if (EXISTS "${vkcv_asset_loader_lib_path}/stb")
+	list(APPEND vkcv_asset_loader_includes ${vkcv_asset_loader_lib}/stb)
+else()
+	message(WARNING "STB is required..! Update the submodules!")
+endif ()

stb @ c9064e31

+Subproject commit c9064e317699d2e495f36ba4f9ac037e88ee371a