Add SpirvHelper (Shader cross compilation)

- Make OpenGL2 and OpenGL3 use the same base shaders (using SpirvHelper)
- Add Transpose func to Mat4

vendor/CMakeLists.txt

@@ -1,10 +1,17 @@
 cmake_minimum_required(VERSION 3.22)
 
 if(${CMAKE_SYSTEM_NAME} STREQUAL "Nintendo3DS")
-	add_subdirectory(${CMAKE_CURRENT_SOURCE_DIR}/libpicasso)
+    add_subdirectory(${CMAKE_CURRENT_SOURCE_DIR}/libpicasso)
 else()
-	# GLAD
-	add_subdirectory(${CMAKE_CURRENT_SOURCE_DIR}/glad)
+    # GLAD
+    add_subdirectory(${CMAKE_CURRENT_SOURCE_DIR}/glad)
+    # GLSLANG
+    set(ENABLE_OPT OFF CACHE BOOL "" FORCE)
+    add_subdirectory(${CMAKE_CURRENT_SOURCE_DIR}/glslang)
+    # SPIRV-Cross
+    set(SPIRV_CROSS_CLI OFF CACHE BOOL "" FORCE)
+    set(SPIRV_CROSS_ENABLE_TESTS OFF CACHE BOOL "" FORCE)
+    add_subdirectory(${CMAKE_CURRENT_SOURCE_DIR}/spirv-cross)
 endif()
 
 # STB
@@ -12,9 +19,9 @@ add_library(stb INTERFACE)
 target_include_directories(stb INTERFACE ${CMAKE_CURRENT_SOURCE_DIR}/stb)
 
 if(NOT ${CMAKE_SYSTEM_NAME} STREQUAL "Nintendo3DS")
-	# GLFW
-	set(GLFW_BUILD_EXAMPLES OFF CACHE BOOL "")
-	set(GLFW_BUILD_TESTS OFF CACHE BOOL "")
-	set(GLFW_BUILD_DOCS OFF CACHE BOOL "")
-	add_subdirectory(${CMAKE_CURRENT_SOURCE_DIR}/glfw)
-endif()
+    # GLFW
+    set(GLFW_BUILD_EXAMPLES OFF CACHE BOOL "")
+    set(GLFW_BUILD_TESTS OFF CACHE BOOL "")
+    set(GLFW_BUILD_DOCS OFF CACHE BOOL "")
+    add_subdirectory(${CMAKE_CURRENT_SOURCE_DIR}/glfw)
+endif()