use submodules for externals

Author: malytomas

.gitignore

@@ -1,14 +1,6 @@
 config.mk
 build/
 libmgl.dylib
-external/glfw/src/MGLContext.h
-external/glfw/src/MGLRenderer.h
-external/OpenGL-Registry/
-external/SPIRV-Cross/
-external/SPIRV-Headers/
-external/SPIRV-Tools/
-external/ezxml/
-external/glslang/
 *.DS_Store
 /SPIRV-Headers
 /SPIRV-Cross

.gitmodules

@@ -0,0 +1,6 @@
+[submodule "external/glslang"]
+	path = external/glslang
+	url = https://github.com/KhronosGroup/glslang.git
+[submodule "external/SPIRV-Cross"]
+	path = external/SPIRV-Cross
+	url = https://github.com/r58Playz/SPIRV-Cross.git

CMakeLists.txt

@@ -1,11 +1,15 @@
 cmake_minimum_required(VERSION 3.15)
 project(MGL LANGUAGES C CXX OBJC)
 
-execute_process(COMMAND "bash" "build_external.sh" WORKING_DIRECTORY "${CMAKE_CURRENT_LIST_DIR}/external" COMMAND_ECHO STDOUT)
-
 set(CMAKE_C_STANDARD 17)
 set(CMAKE_CXX_STANDARD 20)
 
+set(ENABLE_OPT ON)
+
+add_subdirectory(external/SPIRV-Cross)
+add_subdirectory(external/glslang)
+add_subdirectory(external/glfw)
+
 include_directories(
 	MGL/SPIRV/SPIRV-Cross
 	MGL/include
@@ -60,14 +64,7 @@ target_link_libraries(mgl PUBLIC
 )
 
 if(MGL_BUILD_TEST)
-	add_library(glfw-imp STATIC IMPORTED)
-	set_target_properties(glfw-imp PROPERTIES IMPORTED_LOCATION "${CMAKE_CURRENT_SOURCE_DIR}/external/glfw/build/src/libglfw3.a")
-
-	add_library(glfw INTERFACE)
-	target_link_libraries(glfw INTERFACE glfw-imp mgl)
-	target_include_directories(glfw INTERFACE "external/glfw/include")
-
-	add_dependencies(glfw mgl)
+	target_link_libraries(glfw INTERFACE mgl)
 
 	add_library(glm INTERFACE)
 	target_include_directories(glm INTERFACE "mgl/MGL/include")

external/SPIRV-Cross

@@ -0,0 +1 @@
+../../../MGL/include/MGLContext.h

external/build_external.sh

@@ -0,0 +1 @@
+../../../MGL/include/MGLRenderer.h