Switch from Git Submodules to CMake FetchContent

.gitmodules

@@ -1,12 +0,0 @@
-[submodule "lib/spdlog"]
-	path = lib/spdlog
-	url = git@github.com:gabime/spdlog.git
-[submodule "lib/entt"]
-	path = lib/entt
-	url = https://github.com/skypjack/entt.git
-[submodule "lib/glfw"]
-	path = lib/glfw
-	url = https://github.com/glfw/glfw.git
-[submodule "lib/fx-gltf"]
-	path = lib/fx-gltf
-	url = https://github.com/jessey-git/fx-gltf.git

CMakeLists.txt

@@ -12,8 +12,34 @@ set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
 
 include(FetchContent)
 
-FetchContent_Declare(json URL https://github.com/nlohmann/json/releases/download/v3.11.2/json.tar.xz)
+# EnTT
-FetchContent_MakeAvailable(json)
+FetchContent_Declare(
+    entt
+    URL https://github.com/skypjack/entt/archive/refs/tags/v3.11.1.tar.gz
+)
+
+FetchContent_MakeAvailable(entt)
+
+# GLFW
+FetchContent_Declare(
+    glfw
+    URL https://github.com/glfw/glfw/releases/download/3.3.8/glfw-3.3.8.zip
+)
+
+option(GLFW_BUILD_DOCS "" OFF)
+option(GLFW_INSTALL "" OFF)
+FetchContent_MakeAvailable(glfw)
+
+
+# fx-gltf
+FetchContent_Declare(
+    fx-gltf
+    URL https://github.com/jessey-git/fx-gltf/archive/refs/tags/v2.0.0.tar.gz
+)
+
+option(FX_GLTF_BUILD_TESTS "" OFF)
+option(FX_GLTF_INSTALL "" OFF)
+FetchContent_MakeAvailable(fx-gltf)
 
 find_package(glm REQUIRED)
 find_package(spdlog REQUIRED)

lib/CMakeLists.txt

@@ -1,12 +1,2 @@
 add_subdirectory(${CMAKE_CURRENT_SOURCE_DIR}/glad)
-add_subdirectory(${CMAKE_CURRENT_SOURCE_DIR}/entt)
-
-option(GLFW_BUILD_DOCS "" OFF)
-option(GLFW_INSTALL "" OFF)
-add_subdirectory(${CMAKE_CURRENT_SOURCE_DIR}/glfw)
-
-option(FX_GLTF_BUILD_TESTS "" OFF)
-option(FX_GLTF_INSTALL "" OFF)
-add_subdirectory(${CMAKE_CURRENT_SOURCE_DIR}/fx-gltf)
-
 add_subdirectory(${CMAKE_CURRENT_SOURCE_DIR}/stb)

src/CMakeLists.txt

@@ -29,7 +29,6 @@ target_link_libraries(
     pthread
     spdlog
     fx-gltf::fx-gltf
-    nlohmann_json::nlohmann_json
     stb
 )