Add a vendored copy of SDL

vendored/sdl/Xcode/SDL/pkg-support/resources/CMake/sdl2-config-version.cmake

@@ -0,0 +1,48 @@
+# based on the files generated by CMake's write_basic_package_version_file
+
+# SDL2 CMake version configuration file:
+# This file is meant to be placed in Resources/CMake of a SDL2 framework
+
+if(NOT EXISTS "${CMAKE_CURRENT_LIST_DIR}/../../Headers/SDL_version.h")
+    message(AUTHOR_WARNING "Could not find SDL_version.h. This script is meant to be placed in the Resources/CMake directory of SDL2.framework")
+    return()
+endif()
+
+file(READ "${CMAKE_CURRENT_LIST_DIR}/../../Headers/SDL_version.h" _sdl_version_h)
+string(REGEX MATCH "#define[ \t]+SDL_MAJOR_VERSION[ \t]+([0-9]+)" _sdl_major_re "${_sdl_version_h}")
+set(_sdl_major "${CMAKE_MATCH_1}")
+string(REGEX MATCH "#define[ \t]+SDL_MINOR_VERSION[ \t]+([0-9]+)" _sdl_minor_re "${_sdl_version_h}")
+set(_sdl_minor "${CMAKE_MATCH_1}")
+string(REGEX MATCH "#define[ \t]+SDL_PATCHLEVEL[ \t]+([0-9]+)" _sdl_patch_re "${_sdl_version_h}")
+set(_sdl_patch "${CMAKE_MATCH_1}")
+if(_sdl_major_re AND _sdl_minor_re AND _sdl_patch_re)
+    set(PACKAGE_VERSION "${_sdl_major}.${_sdl_minor}.${_sdl_patch}")
+else()
+    message(AUTHOR_WARNING "Could not extract version from SDL_version.h.")
+    return()
+endif()
+
+if(PACKAGE_FIND_VERSION_RANGE)
+    # Package version must be in the requested version range
+    if ((PACKAGE_FIND_VERSION_RANGE_MIN STREQUAL "INCLUDE" AND PACKAGE_VERSION VERSION_LESS PACKAGE_FIND_VERSION_MIN)
+        OR ((PACKAGE_FIND_VERSION_RANGE_MAX STREQUAL "INCLUDE" AND PACKAGE_VERSION VERSION_GREATER PACKAGE_FIND_VERSION_MAX)
+        OR (PACKAGE_FIND_VERSION_RANGE_MAX STREQUAL "EXCLUDE" AND PACKAGE_VERSION VERSION_GREATER_EQUAL PACKAGE_FIND_VERSION_MAX)))
+        set(PACKAGE_VERSION_COMPATIBLE FALSE)
+    else()
+        set(PACKAGE_VERSION_COMPATIBLE TRUE)
+    endif()
+else()
+    if(PACKAGE_VERSION VERSION_LESS PACKAGE_FIND_VERSION)
+        set(PACKAGE_VERSION_COMPATIBLE FALSE)
+    else()
+        set(PACKAGE_VERSION_COMPATIBLE TRUE)
+        if(PACKAGE_FIND_VERSION STREQUAL PACKAGE_VERSION)
+            set(PACKAGE_VERSION_EXACT TRUE)
+        endif()
+    endif()
+endif()
+
+# if the using project doesn't have CMAKE_SIZEOF_VOID_P set, fail.
+if("${CMAKE_SIZEOF_VOID_P}" STREQUAL "")
+    set(PACKAGE_VERSION_UNSUITABLE TRUE)
+endif()

vendored/sdl/Xcode/SDL/pkg-support/resources/CMake/sdl2-config.cmake

@@ -0,0 +1,78 @@
+# SDL2 CMake configuration file:
+# This file is meant to be placed in Resources/CMake of a SDL2 framework
+
+# INTERFACE_LINK_OPTIONS needs CMake 3.12
+cmake_minimum_required(VERSION 3.12)
+
+include(FeatureSummary)
+set_package_properties(SDL2 PROPERTIES
+    URL "https://www.libsdl.org/"
+    DESCRIPTION "low level access to audio, keyboard, mouse, joystick, and graphics hardware"
+)
+
+# Copied from `configure_package_config_file`
+macro(set_and_check _var _file)
+    set(${_var} "${_file}")
+    if(NOT EXISTS "${_file}")
+        message(FATAL_ERROR "File or directory ${_file} referenced by variable ${_var} does not exist !")
+    endif()
+endmacro()
+
+# Copied from `configure_package_config_file`
+macro(check_required_components _NAME)
+    foreach(comp ${${_NAME}_FIND_COMPONENTS})
+        if(NOT ${_NAME}_${comp}_FOUND)
+            if(${_NAME}_FIND_REQUIRED_${comp})
+                set(${_NAME}_FOUND FALSE)
+            endif()
+        endif()
+    endforeach()
+endmacro()
+
+set(SDL2_FOUND TRUE)
+
+# Compute the installation prefix relative to this file.
+set(SDL2_FRAMEWORK_PATH "${CMAKE_CURRENT_LIST_DIR}")                                # > /SDL2.framework/Resources/CMake/
+get_filename_component(SDL2_FRAMEWORK_PATH "${SDL2_FRAMEWORK_PATH}" REALPATH)       # > /SDL2.framework/Versions/Current/Resources/CMake
+get_filename_component(SDL2_FRAMEWORK_PATH "${SDL2_FRAMEWORK_PATH}" REALPATH)       # > /SDL2.framework/Versions/A/Resources/CMake/
+get_filename_component(SDL2_FRAMEWORK_PATH "${SDL2_FRAMEWORK_PATH}" PATH)           # > /SDL2.framework/Versions/A/Resources/
+get_filename_component(SDL2_FRAMEWORK_PATH "${SDL2_FRAMEWORK_PATH}" PATH)           # > /SDL2.framework/Versions/A/
+get_filename_component(SDL2_FRAMEWORK_PATH "${SDL2_FRAMEWORK_PATH}" PATH)           # > /SDL2.framework/Versions/
+get_filename_component(SDL2_FRAMEWORK_PATH "${SDL2_FRAMEWORK_PATH}" PATH)           # > /SDL2.framework/
+get_filename_component(SDL2_FRAMEWORK_PARENT_PATH "${SDL2_FRAMEWORK_PATH}" PATH)    # > /
+
+# For compatibility with autotools sdl2-config.cmake, provide SDL2_* variables.
+
+set_and_check(SDL2_PREFIX       "${SDL2_FRAMEWORK_PATH}")
+set_and_check(SDL2_EXEC_PREFIX  "${SDL2_FRAMEWORK_PATH}")
+set_and_check(SDL2_INCLUDE_DIR  "${SDL2_FRAMEWORK_PATH}/Headers")
+set(SDL2_INCLUDE_DIRS           "${SDL2_INCLUDE_DIR};${SDL2_FRAMEWORK_PATH}")
+set_and_check(SDL2_BINDIR       "${SDL2_FRAMEWORK_PATH}")
+set_and_check(SDL2_LIBDIR       "${SDL2_FRAMEWORK_PATH}")
+
+set(SDL2_LIBRARIES "SDL2::SDL2")
+
+# All targets are created, even when some might not be requested though COMPONENTS.
+# This is done for compatibility with CMake generated SDL2-target.cmake files.
+
+if(NOT TARGET SDL2::SDL2)
+    add_library(SDL2::SDL2 SHARED IMPORTED)
+    set_target_properties(SDL2::SDL2
+        PROPERTIES
+            FRAMEWORK "TRUE"
+            IMPORTED_LOCATION "${SDL2_FRAMEWORK_PATH}/Versions/A/SDL2"
+            INTERFACE_INCLUDE_DIRECTORIES "${SDL2_INCLUDE_DIRS}"
+            COMPATIBLE_INTERFACE_BOOL "SDL2_SHARED"
+            INTERFACE_SDL2_SHARED "ON"
+            COMPATIBLE_INTERFACE_STRING "SDL_VERSION"
+            INTERFACE_SDL_VERSION "SDL2"
+    )
+endif()
+set(SDL2_SDL2_FOUND TRUE)
+
+if(NOT TARGET SDL2::SDL2main)
+    add_library(SDL2::SDL2main INTERFACE IMPORTED)
+endif()
+set(SDL2_SDL2main_FOUND TRUE)
+
+check_required_components(SDL2)

vendored/sdl/Xcode/SDL/pkg-support/resources/License.txt

@@ -0,0 +1,19 @@
+
+Simple DirectMedia Layer
+Copyright (C) 1997-2024 Sam Lantinga <slouken@libsdl.org>
+  
+This software is provided 'as-is', without any express or implied
+warranty.  In no event will the authors be held liable for any damages
+arising from the use of this software.
+
+Permission is granted to anyone to use this software for any purpose,
+including commercial applications, and to alter it and redistribute it
+freely, subject to the following restrictions:
+  
+1. The origin of this software must not be misrepresented; you must not
+   claim that you wrote the original software. If you use this software
+   in a product, an acknowledgment in the product documentation would be
+   appreciated but is not required. 
+2. Altered source versions must be plainly marked as such, and must not be
+   misrepresented as being the original software.
+3. This notice may not be removed or altered from any source distribution.

vendored/sdl/Xcode/SDL/pkg-support/resources/ReadMe.txt

@@ -0,0 +1,44 @@
+The Simple DirectMedia Layer (SDL for short) is a cross-platform 
+library designed to make it easy to write multi-media software, 
+such as games and emulators.
+
+The Simple DirectMedia Layer library source code is available from: 
+http://www.libsdl.org/
+
+This library is distributed under the terms of the zlib license: 
+http://zlib.net/zlib_license.html
+
+
+This packages contains the SDL framework for OS X. 
+Conforming with Apple guidelines, this framework 
+contains both the SDL runtime component and development header files.
+
+
+To Install:
+Copy the SDL2.framework to /Library/Frameworks
+
+You may alternatively install it in <Your home directory>/Library/Frameworks 
+if your access privileges are not high enough.
+
+
+Use in CMake projects:
+SDL2.framework can be used in CMake projects using the following pattern:
+```
+find_package(SDL2 REQUIRED COMPONENTS SDL2)
+add_executable(my_game ${MY_SOURCES})
+target_link_libraries(my_game PRIVATE SDL2::SDL2)
+```
+If SDL2.framework is installed in a non-standard location,
+please refer to the following link for ways to configure CMake:
+https://cmake.org/cmake/help/latest/command/find_package.html#config-mode-search-procedure
+
+
+Additional References:
+
+ - Screencast tutorials for getting started with OpenSceneGraph/Mac OS X are 
+ 	available at:
+	http://www.openscenegraph.org/projects/osg/wiki/Support/Tutorials/MacOSXTips
+	Though these are OpenSceneGraph centric, the same exact concepts apply to 
+	SDL, thus the videos are recommended for everybody getting started with
+	developing on Mac OS X. (You can skim over the PlugIns stuff since SDL
+	doesn't have any PlugIns to worry about.)