commit b9afc57e6e60838824e53300847e6d3fac37c6e2
Author: Redacted <william@stepmail.co>
Date:   Thu Jan 2 00:15:37 2025 -0500

    Initial Commit

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..a6d16e4
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,4 @@
+/cmake-build-debug
+/.idea
+
+/assets/test_files
\ No newline at end of file
diff --git a/CMakeLists.txt b/CMakeLists.txt
new file mode 100644
index 0000000..19f1444
--- /dev/null
+++ b/CMakeLists.txt
@@ -0,0 +1,38 @@
+cmake_minimum_required(VERSION 3.28)
+project(DemoGame
+        VERSION 1.0
+        LANGUAGES CXX
+)
+
+if (PROJECT_SOURCE_DIR STREQUAL PROJECT_BINARY_DIR)
+    message(FATAL_ERROR "In-source builds are not allowed")
+endif()
+
+set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} "${CMAKE_CURRENT_SOURCE_DIR}/cmake")
+set(CMAKE_CXX_STANDARD 20)
+include (cmake/CPM.cmake)
+
+CPMAddPackage(
+        NAME JGL
+        URL https://git.redacted.cc/josh/JGL/archive/Prerelease-44.zip
+)
+
+CPMAddPackage(
+        NAME ReWindow
+        URL https://git.redacted.cc/Redacted/ReWindow/archive/Prerelease-26.zip
+)
+
+set(CMAKE_CXX_FLAGS "-O3 -Wall -Wextra")
+
+file(GLOB_RECURSE HEADERS "include/*.h" "include/*.hpp")
+file(GLOB_RECURSE SOURCES "src/*.c" "src/*.cpp")
+file(COPY "assets" DESTINATION "${PROJECT_BINARY_DIR}")
+
+add_executable(DemoGame ${SOURCES} main.cpp)
+target_include_directories(DemoGame PUBLIC
+        ${JGL_SOURCE_DIR}/include
+        ${ReWindow_SOURCE_DIR}/include
+        ${PROJECT_SOURCE_DIR}/include
+)
+
+target_link_libraries(DemoGame PUBLIC JGL ReWindowLibrary)
diff --git a/assets/sprites/Re3D.png b/assets/sprites/Re3D.png
new file mode 100644
index 0000000..464ec4d
Binary files /dev/null and b/assets/sprites/Re3D.png differ
diff --git a/cmake/CPM.cmake b/cmake/CPM.cmake
new file mode 100644
index 0000000..c82a386
--- /dev/null
+++ b/cmake/CPM.cmake
@@ -0,0 +1,1161 @@
+# CPM.cmake - CMake's missing package manager
+# ===========================================
+# See https://github.com/cpm-cmake/CPM.cmake for usage and update instructions.
+#
+# MIT License
+# -----------
+#[[
+  Copyright (c) 2019-2023 Lars Melchior and contributors
+
+  Permission is hereby granted, free of charge, to any person obtaining a copy
+  of this software and associated documentation files (the "Software"), to deal
+  in the Software without restriction, including without limitation the rights
+  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+  copies of the Software, and to permit persons to whom the Software is
+  furnished to do so, subject to the following conditions:
+
+  The above copyright notice and this permission notice shall be included in all
+  copies or substantial portions of the Software.
+
+  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+  SOFTWARE.
+]]
+
+cmake_minimum_required(VERSION 3.14 FATAL_ERROR)
+
+# Initialize logging prefix
+if(NOT CPM_INDENT)
+  set(CPM_INDENT
+      "CPM:"
+      CACHE INTERNAL ""
+  )
+endif()
+
+if(NOT COMMAND cpm_message)
+  function(cpm_message)
+    message(${ARGV})
+  endfunction()
+endif()
+
+set(CURRENT_CPM_VERSION 0.38.7)
+
+get_filename_component(CPM_CURRENT_DIRECTORY "${CMAKE_CURRENT_LIST_DIR}" REALPATH)
+if(CPM_DIRECTORY)
+  if(NOT CPM_DIRECTORY STREQUAL CPM_CURRENT_DIRECTORY)
+    if(CPM_VERSION VERSION_LESS CURRENT_CPM_VERSION)
+      message(
+        AUTHOR_WARNING
+          "${CPM_INDENT} \
+A dependency is using a more recent CPM version (${CURRENT_CPM_VERSION}) than the current project (${CPM_VERSION}). \
+It is recommended to upgrade CPM to the most recent version. \
+See https://github.com/cpm-cmake/CPM.cmake for more information."
+      )
+    endif()
+    if(${CMAKE_VERSION} VERSION_LESS "3.17.0")
+      include(FetchContent)
+    endif()
+    return()
+  endif()
+
+  get_property(
+    CPM_INITIALIZED GLOBAL ""
+    PROPERTY CPM_INITIALIZED
+    SET
+  )
+  if(CPM_INITIALIZED)
+    return()
+  endif()
+endif()
+
+if(CURRENT_CPM_VERSION MATCHES "development-version")
+  message(
+    WARNING "${CPM_INDENT} Your project is using an unstable development version of CPM.cmake. \
+Please update to a recent release if possible. \
+See https://github.com/cpm-cmake/CPM.cmake for details."
+  )
+endif()
+
+set_property(GLOBAL PROPERTY CPM_INITIALIZED true)
+
+macro(cpm_set_policies)
+  # the policy allows us to change options without caching
+  cmake_policy(SET CMP0077 NEW)
+  set(CMAKE_POLICY_DEFAULT_CMP0077 NEW)
+
+  # the policy allows us to change set(CACHE) without caching
+  if(POLICY CMP0126)
+    cmake_policy(SET CMP0126 NEW)
+    set(CMAKE_POLICY_DEFAULT_CMP0126 NEW)
+  endif()
+
+  # The policy uses the download time for timestamp, instead of the timestamp in the archive. This
+  # allows for proper rebuilds when a projects url changes
+  if(POLICY CMP0135)
+    cmake_policy(SET CMP0135 NEW)
+    set(CMAKE_POLICY_DEFAULT_CMP0135 NEW)
+  endif()
+
+  # treat relative git repository paths as being relative to the parent project's remote
+  if(POLICY CMP0150)
+    cmake_policy(SET CMP0150 NEW)
+    set(CMAKE_POLICY_DEFAULT_CMP0150 NEW)
+  endif()
+endmacro()
+cpm_set_policies()
+
+option(CPM_USE_LOCAL_PACKAGES "Always try to use `find_package` to get dependencies"
+       $ENV{CPM_USE_LOCAL_PACKAGES}
+)
+option(CPM_LOCAL_PACKAGES_ONLY "Only use `find_package` to get dependencies"
+       $ENV{CPM_LOCAL_PACKAGES_ONLY}
+)
+option(CPM_DOWNLOAD_ALL "Always download dependencies from source" $ENV{CPM_DOWNLOAD_ALL})
+option(CPM_DONT_UPDATE_MODULE_PATH "Don't update the module path to allow using find_package"
+       $ENV{CPM_DONT_UPDATE_MODULE_PATH}
+)
+option(CPM_DONT_CREATE_PACKAGE_LOCK "Don't create a package lock file in the binary path"
+       $ENV{CPM_DONT_CREATE_PACKAGE_LOCK}
+)
+option(CPM_INCLUDE_ALL_IN_PACKAGE_LOCK
+       "Add all packages added through CPM.cmake to the package lock"
+       $ENV{CPM_INCLUDE_ALL_IN_PACKAGE_LOCK}
+)
+option(CPM_USE_NAMED_CACHE_DIRECTORIES
+       "Use additional directory of package name in cache on the most nested level."
+       $ENV{CPM_USE_NAMED_CACHE_DIRECTORIES}
+)
+
+set(CPM_VERSION
+    ${CURRENT_CPM_VERSION}
+    CACHE INTERNAL ""
+)
+set(CPM_DIRECTORY
+    ${CPM_CURRENT_DIRECTORY}
+    CACHE INTERNAL ""
+)
+set(CPM_FILE
+    ${CMAKE_CURRENT_LIST_FILE}
+    CACHE INTERNAL ""
+)
+set(CPM_PACKAGES
+    ""
+    CACHE INTERNAL ""
+)
+set(CPM_DRY_RUN
+    OFF
+    CACHE INTERNAL "Don't download or configure dependencies (for testing)"
+)
+
+if(DEFINED ENV{CPM_SOURCE_CACHE})
+  set(CPM_SOURCE_CACHE_DEFAULT $ENV{CPM_SOURCE_CACHE})
+else()
+  set(CPM_SOURCE_CACHE_DEFAULT OFF)
+endif()
+
+set(CPM_SOURCE_CACHE
+    ${CPM_SOURCE_CACHE_DEFAULT}
+    CACHE PATH "Directory to download CPM dependencies"
+)
+
+if(NOT CPM_DONT_UPDATE_MODULE_PATH)
+  set(CPM_MODULE_PATH
+      "${CMAKE_BINARY_DIR}/CPM_modules"
+      CACHE INTERNAL ""
+  )
+  # remove old modules
+  file(REMOVE_RECURSE ${CPM_MODULE_PATH})
+  file(MAKE_DIRECTORY ${CPM_MODULE_PATH})
+  # locally added CPM modules should override global packages
+  set(CMAKE_MODULE_PATH "${CPM_MODULE_PATH};${CMAKE_MODULE_PATH}")
+endif()
+
+if(NOT CPM_DONT_CREATE_PACKAGE_LOCK)
+  set(CPM_PACKAGE_LOCK_FILE
+      "${CMAKE_BINARY_DIR}/cpm-package-lock.cmake"
+      CACHE INTERNAL ""
+  )
+  file(WRITE ${CPM_PACKAGE_LOCK_FILE}
+       "# CPM Package Lock\n# This file should be committed to version control\n\n"
+  )
+endif()
+
+include(FetchContent)
+
+# Try to infer package name from git repository uri (path or url)
+function(cpm_package_name_from_git_uri URI RESULT)
+  if("${URI}" MATCHES "([^/:]+)/?.git/?$")
+    set(${RESULT}
+        ${CMAKE_MATCH_1}
+        PARENT_SCOPE
+    )
+  else()
+    unset(${RESULT} PARENT_SCOPE)
+  endif()
+endfunction()
+
+# Try to infer package name and version from a url
+function(cpm_package_name_and_ver_from_url url outName outVer)
+  if(url MATCHES "[/\\?]([a-zA-Z0-9_\\.-]+)\\.(tar|tar\\.gz|tar\\.bz2|zip|ZIP)(\\?|/|$)")
+    # We matched an archive
+    set(filename "${CMAKE_MATCH_1}")
+
+    if(filename MATCHES "([a-zA-Z0-9_\\.-]+)[_-]v?(([0-9]+\\.)*[0-9]+[a-zA-Z0-9]*)")
+      # We matched <name>-<version> (ie foo-1.2.3)
+      set(${outName}
+          "${CMAKE_MATCH_1}"
+          PARENT_SCOPE
+      )
+      set(${outVer}
+          "${CMAKE_MATCH_2}"
+          PARENT_SCOPE
+      )
+    elseif(filename MATCHES "(([0-9]+\\.)+[0-9]+[a-zA-Z0-9]*)")
+      # We couldn't find a name, but we found a version
+      #
+      # In many cases (which we don't handle here) the url would look something like
+      # `irrelevant/ACTUAL_PACKAGE_NAME/irrelevant/1.2.3.zip`. In such a case we can't possibly
+      # distinguish the package name from the irrelevant bits. Moreover if we try to match the
+      # package name from the filename, we'd get bogus at best.
+      unset(${outName} PARENT_SCOPE)
+      set(${outVer}
+          "${CMAKE_MATCH_1}"
+          PARENT_SCOPE
+      )
+    else()
+      # Boldly assume that the file name is the package name.
+      #
+      # Yes, something like `irrelevant/ACTUAL_NAME/irrelevant/download.zip` will ruin our day, but
+      # such cases should be quite rare. No popular service does this... we think.
+      set(${outName}
+          "${filename}"
+          PARENT_SCOPE
+      )
+      unset(${outVer} PARENT_SCOPE)
+    endif()
+  else()
+    # No ideas yet what to do with non-archives
+    unset(${outName} PARENT_SCOPE)
+    unset(${outVer} PARENT_SCOPE)
+  endif()
+endfunction()
+
+function(cpm_find_package NAME VERSION)
+  string(REPLACE " " ";" EXTRA_ARGS "${ARGN}")
+  find_package(${NAME} ${VERSION} ${EXTRA_ARGS} QUIET)
+  if(${CPM_ARGS_NAME}_FOUND)
+    if(DEFINED ${CPM_ARGS_NAME}_VERSION)
+      set(VERSION ${${CPM_ARGS_NAME}_VERSION})
+    endif()
+    cpm_message(STATUS "${CPM_INDENT} Using local package ${CPM_ARGS_NAME}@${VERSION}")
+    CPMRegisterPackage(${CPM_ARGS_NAME} "${VERSION}")
+    set(CPM_PACKAGE_FOUND
+        YES
+        PARENT_SCOPE
+    )
+  else()
+    set(CPM_PACKAGE_FOUND
+        NO
+        PARENT_SCOPE
+    )
+  endif()
+endfunction()
+
+# Create a custom FindXXX.cmake module for a CPM package This prevents `find_package(NAME)` from
+# finding the system library
+function(cpm_create_module_file Name)
+  if(NOT CPM_DONT_UPDATE_MODULE_PATH)
+    # erase any previous modules
+    file(WRITE ${CPM_MODULE_PATH}/Find${Name}.cmake
+         "include(\"${CPM_FILE}\")\n${ARGN}\nset(${Name}_FOUND TRUE)"
+    )
+  endif()
+endfunction()
+
+# Find a package locally or fallback to CPMAddPackage
+function(CPMFindPackage)
+  set(oneValueArgs NAME VERSION GIT_TAG FIND_PACKAGE_ARGUMENTS)
+
+  cmake_parse_arguments(CPM_ARGS "" "${oneValueArgs}" "" ${ARGN})
+
+  if(NOT DEFINED CPM_ARGS_VERSION)
+    if(DEFINED CPM_ARGS_GIT_TAG)
+      cpm_get_version_from_git_tag("${CPM_ARGS_GIT_TAG}" CPM_ARGS_VERSION)
+    endif()
+  endif()
+
+  set(downloadPackage ${CPM_DOWNLOAD_ALL})
+  if(DEFINED CPM_DOWNLOAD_${CPM_ARGS_NAME})
+    set(downloadPackage ${CPM_DOWNLOAD_${CPM_ARGS_NAME}})
+  elseif(DEFINED ENV{CPM_DOWNLOAD_${CPM_ARGS_NAME}})
+    set(downloadPackage $ENV{CPM_DOWNLOAD_${CPM_ARGS_NAME}})
+  endif()
+  if(downloadPackage)
+    CPMAddPackage(${ARGN})
+    cpm_export_variables(${CPM_ARGS_NAME})
+    return()
+  endif()
+
+  cpm_check_if_package_already_added(${CPM_ARGS_NAME} "${CPM_ARGS_VERSION}")
+  if(CPM_PACKAGE_ALREADY_ADDED)
+    cpm_export_variables(${CPM_ARGS_NAME})
+    return()
+  endif()
+
+  cpm_find_package(${CPM_ARGS_NAME} "${CPM_ARGS_VERSION}" ${CPM_ARGS_FIND_PACKAGE_ARGUMENTS})
+
+  if(NOT CPM_PACKAGE_FOUND)
+    CPMAddPackage(${ARGN})
+    cpm_export_variables(${CPM_ARGS_NAME})
+  endif()
+
+endfunction()
+
+# checks if a package has been added before
+function(cpm_check_if_package_already_added CPM_ARGS_NAME CPM_ARGS_VERSION)
+  if("${CPM_ARGS_NAME}" IN_LIST CPM_PACKAGES)
+    CPMGetPackageVersion(${CPM_ARGS_NAME} CPM_PACKAGE_VERSION)
+    if("${CPM_PACKAGE_VERSION}" VERSION_LESS "${CPM_ARGS_VERSION}")
+      message(
+        WARNING
+          "${CPM_INDENT} Requires a newer version of ${CPM_ARGS_NAME} (${CPM_ARGS_VERSION}) than currently included (${CPM_PACKAGE_VERSION})."
+      )
+    endif()
+    cpm_get_fetch_properties(${CPM_ARGS_NAME})
+    set(${CPM_ARGS_NAME}_ADDED NO)
+    set(CPM_PACKAGE_ALREADY_ADDED
+        YES
+        PARENT_SCOPE
+    )
+    cpm_export_variables(${CPM_ARGS_NAME})
+  else()
+    set(CPM_PACKAGE_ALREADY_ADDED
+        NO
+        PARENT_SCOPE
+    )
+  endif()
+endfunction()
+
+# Parse the argument of CPMAddPackage in case a single one was provided and convert it to a list of
+# arguments which can then be parsed idiomatically. For example gh:foo/bar@1.2.3 will be converted
+# to: GITHUB_REPOSITORY;foo/bar;VERSION;1.2.3
+function(cpm_parse_add_package_single_arg arg outArgs)
+  # Look for a scheme
+  if("${arg}" MATCHES "^([a-zA-Z]+):(.+)$")
+    string(TOLOWER "${CMAKE_MATCH_1}" scheme)
+    set(uri "${CMAKE_MATCH_2}")
+
+    # Check for CPM-specific schemes
+    if(scheme STREQUAL "gh")
+      set(out "GITHUB_REPOSITORY;${uri}")
+      set(packageType "git")
+    elseif(scheme STREQUAL "gl")
+      set(out "GITLAB_REPOSITORY;${uri}")
+      set(packageType "git")
+    elseif(scheme STREQUAL "bb")
+      set(out "BITBUCKET_REPOSITORY;${uri}")
+      set(packageType "git")
+      # A CPM-specific scheme was not found. Looks like this is a generic URL so try to determine
+      # type
+    elseif(arg MATCHES ".git/?(@|#|$)")
+      set(out "GIT_REPOSITORY;${arg}")
+      set(packageType "git")
+    else()
+      # Fall back to a URL
+      set(out "URL;${arg}")
+      set(packageType "archive")
+
+      # We could also check for SVN since FetchContent supports it, but SVN is so rare these days.
+      # We just won't bother with the additional complexity it will induce in this function. SVN is
+      # done by multi-arg
+    endif()
+  else()
+    if(arg MATCHES ".git/?(@|#|$)")
+      set(out "GIT_REPOSITORY;${arg}")
+      set(packageType "git")
+    else()
+      # Give up
+      message(FATAL_ERROR "${CPM_INDENT} Can't determine package type of '${arg}'")
+    endif()
+  endif()
+
+  # For all packages we interpret @... as version. Only replace the last occurrence. Thus URIs
+  # containing '@' can be used
+  string(REGEX REPLACE "@([^@]+)$" ";VERSION;\\1" out "${out}")
+
+  # Parse the rest according to package type
+  if(packageType STREQUAL "git")
+    # For git repos we interpret #... as a tag or branch or commit hash
+    string(REGEX REPLACE "#([^#]+)$" ";GIT_TAG;\\1" out "${out}")
+  elseif(packageType STREQUAL "archive")
+    # For archives we interpret #... as a URL hash.
+    string(REGEX REPLACE "#([^#]+)$" ";URL_HASH;\\1" out "${out}")
+    # We don't try to parse the version if it's not provided explicitly. cpm_get_version_from_url
+    # should do this at a later point
+  else()
+    # We should never get here. This is an assertion and hitting it means there's a bug in the code
+    # above. A packageType was set, but not handled by this if-else.
+    message(FATAL_ERROR "${CPM_INDENT} Unsupported package type '${packageType}' of '${arg}'")
+  endif()
+
+  set(${outArgs}
+      ${out}
+      PARENT_SCOPE
+  )
+endfunction()
+
+# Check that the working directory for a git repo is clean
+function(cpm_check_git_working_dir_is_clean repoPath gitTag isClean)
+
+  find_package(Git REQUIRED)
+
+  if(NOT GIT_EXECUTABLE)
+    # No git executable, assume directory is clean
+    set(${isClean}
+        TRUE
+        PARENT_SCOPE
+    )
+    return()
+  endif()
+
+  # check for uncommitted changes
+  execute_process(
+    COMMAND ${GIT_EXECUTABLE} status --porcelain
+    RESULT_VARIABLE resultGitStatus
+    OUTPUT_VARIABLE repoStatus
+    OUTPUT_STRIP_TRAILING_WHITESPACE ERROR_QUIET
+    WORKING_DIRECTORY ${repoPath}
+  )
+  if(resultGitStatus)
+    # not supposed to happen, assume clean anyway
+    message(WARNING "${CPM_INDENT} Calling git status on folder ${repoPath} failed")
+    set(${isClean}
+        TRUE
+        PARENT_SCOPE
+    )
+    return()
+  endif()
+
+  if(NOT "${repoStatus}" STREQUAL "")
+    set(${isClean}
+        FALSE
+        PARENT_SCOPE
+    )
+    return()
+  endif()
+
+  # check for committed changes
+  execute_process(
+    COMMAND ${GIT_EXECUTABLE} diff -s --exit-code ${gitTag}
+    RESULT_VARIABLE resultGitDiff
+    OUTPUT_STRIP_TRAILING_WHITESPACE OUTPUT_QUIET
+    WORKING_DIRECTORY ${repoPath}
+  )
+
+  if(${resultGitDiff} EQUAL 0)
+    set(${isClean}
+        TRUE
+        PARENT_SCOPE
+    )
+  else()
+    set(${isClean}
+        FALSE
+        PARENT_SCOPE
+    )
+  endif()
+
+endfunction()
+
+# method to overwrite internal FetchContent properties, to allow using CPM.cmake to overload
+# FetchContent calls. As these are internal cmake properties, this method should be used carefully
+# and may need modification in future CMake versions. Source:
+# https://github.com/Kitware/CMake/blob/dc3d0b5a0a7d26d43d6cfeb511e224533b5d188f/Modules/FetchContent.cmake#L1152
+function(cpm_override_fetchcontent contentName)
+  cmake_parse_arguments(PARSE_ARGV 1 arg "" "SOURCE_DIR;BINARY_DIR" "")
+  if(NOT "${arg_UNPARSED_ARGUMENTS}" STREQUAL "")
+    message(FATAL_ERROR "${CPM_INDENT} Unsupported arguments: ${arg_UNPARSED_ARGUMENTS}")
+  endif()
+
+  string(TOLOWER ${contentName} contentNameLower)
+  set(prefix "_FetchContent_${contentNameLower}")
+
+  set(propertyName "${prefix}_sourceDir")
+  define_property(
+    GLOBAL
+    PROPERTY ${propertyName}
+    BRIEF_DOCS "Internal implementation detail of FetchContent_Populate()"
+    FULL_DOCS "Details used by FetchContent_Populate() for ${contentName}"
+  )
+  set_property(GLOBAL PROPERTY ${propertyName} "${arg_SOURCE_DIR}")
+
+  set(propertyName "${prefix}_binaryDir")
+  define_property(
+    GLOBAL
+    PROPERTY ${propertyName}
+    BRIEF_DOCS "Internal implementation detail of FetchContent_Populate()"
+    FULL_DOCS "Details used by FetchContent_Populate() for ${contentName}"
+  )
+  set_property(GLOBAL PROPERTY ${propertyName} "${arg_BINARY_DIR}")
+
+  set(propertyName "${prefix}_populated")
+  define_property(
+    GLOBAL
+    PROPERTY ${propertyName}
+    BRIEF_DOCS "Internal implementation detail of FetchContent_Populate()"
+    FULL_DOCS "Details used by FetchContent_Populate() for ${contentName}"
+  )
+  set_property(GLOBAL PROPERTY ${propertyName} TRUE)
+endfunction()
+
+# Download and add a package from source
+function(CPMAddPackage)
+  cpm_set_policies()
+
+  list(LENGTH ARGN argnLength)
+  if(argnLength EQUAL 1)
+    cpm_parse_add_package_single_arg("${ARGN}" ARGN)
+
+    # The shorthand syntax implies EXCLUDE_FROM_ALL and SYSTEM
+    set(ARGN "${ARGN};EXCLUDE_FROM_ALL;YES;SYSTEM;YES;")
+  endif()
+
+  set(oneValueArgs
+      NAME
+      FORCE
+      VERSION
+      GIT_TAG
+      DOWNLOAD_ONLY
+      GITHUB_REPOSITORY
+      GITLAB_REPOSITORY
+      BITBUCKET_REPOSITORY
+      GIT_REPOSITORY
+      SOURCE_DIR
+      FIND_PACKAGE_ARGUMENTS
+      NO_CACHE
+      SYSTEM
+      GIT_SHALLOW
+      EXCLUDE_FROM_ALL
+      SOURCE_SUBDIR
+  )
+
+  set(multiValueArgs URL OPTIONS DOWNLOAD_COMMAND)
+
+  cmake_parse_arguments(CPM_ARGS "" "${oneValueArgs}" "${multiValueArgs}" "${ARGN}")
+
+  # Set default values for arguments
+
+  if(NOT DEFINED CPM_ARGS_VERSION)
+    if(DEFINED CPM_ARGS_GIT_TAG)
+      cpm_get_version_from_git_tag("${CPM_ARGS_GIT_TAG}" CPM_ARGS_VERSION)
+    endif()
+  endif()
+
+  if(CPM_ARGS_DOWNLOAD_ONLY)
+    set(DOWNLOAD_ONLY ${CPM_ARGS_DOWNLOAD_ONLY})
+  else()
+    set(DOWNLOAD_ONLY NO)
+  endif()
+
+  if(DEFINED CPM_ARGS_GITHUB_REPOSITORY)
+    set(CPM_ARGS_GIT_REPOSITORY "https://github.com/${CPM_ARGS_GITHUB_REPOSITORY}.git")
+  elseif(DEFINED CPM_ARGS_GITLAB_REPOSITORY)
+    set(CPM_ARGS_GIT_REPOSITORY "https://gitlab.com/${CPM_ARGS_GITLAB_REPOSITORY}.git")
+  elseif(DEFINED CPM_ARGS_BITBUCKET_REPOSITORY)
+    set(CPM_ARGS_GIT_REPOSITORY "https://bitbucket.org/${CPM_ARGS_BITBUCKET_REPOSITORY}.git")
+  endif()
+
+  if(DEFINED CPM_ARGS_GIT_REPOSITORY)
+    list(APPEND CPM_ARGS_UNPARSED_ARGUMENTS GIT_REPOSITORY ${CPM_ARGS_GIT_REPOSITORY})
+    if(NOT DEFINED CPM_ARGS_GIT_TAG)
+      set(CPM_ARGS_GIT_TAG v${CPM_ARGS_VERSION})
+    endif()
+
+    # If a name wasn't provided, try to infer it from the git repo
+    if(NOT DEFINED CPM_ARGS_NAME)
+      cpm_package_name_from_git_uri(${CPM_ARGS_GIT_REPOSITORY} CPM_ARGS_NAME)
+    endif()
+  endif()
+
+  set(CPM_SKIP_FETCH FALSE)
+
+  if(DEFINED CPM_ARGS_GIT_TAG)
+    list(APPEND CPM_ARGS_UNPARSED_ARGUMENTS GIT_TAG ${CPM_ARGS_GIT_TAG})
+    # If GIT_SHALLOW is explicitly specified, honor the value.
+    if(DEFINED CPM_ARGS_GIT_SHALLOW)
+      list(APPEND CPM_ARGS_UNPARSED_ARGUMENTS GIT_SHALLOW ${CPM_ARGS_GIT_SHALLOW})
+    endif()
+  endif()
+
+  if(DEFINED CPM_ARGS_URL)
+    # If a name or version aren't provided, try to infer them from the URL
+    list(GET CPM_ARGS_URL 0 firstUrl)
+    cpm_package_name_and_ver_from_url(${firstUrl} nameFromUrl verFromUrl)
+    # If we fail to obtain name and version from the first URL, we could try other URLs if any.
+    # However multiple URLs are expected to be quite rare, so for now we won't bother.
+
+    # If the caller provided their own name and version, they trump the inferred ones.
+    if(NOT DEFINED CPM_ARGS_NAME)
+      set(CPM_ARGS_NAME ${nameFromUrl})
+    endif()
+    if(NOT DEFINED CPM_ARGS_VERSION)
+      set(CPM_ARGS_VERSION ${verFromUrl})
+    endif()
+
+    list(APPEND CPM_ARGS_UNPARSED_ARGUMENTS URL "${CPM_ARGS_URL}")
+  endif()
+
+  # Check for required arguments
+
+  if(NOT DEFINED CPM_ARGS_NAME)
+    message(
+      FATAL_ERROR
+        "${CPM_INDENT} 'NAME' was not provided and couldn't be automatically inferred for package added with arguments: '${ARGN}'"
+    )
+  endif()
+
+  # Check if package has been added before
+  cpm_check_if_package_already_added(${CPM_ARGS_NAME} "${CPM_ARGS_VERSION}")
+  if(CPM_PACKAGE_ALREADY_ADDED)
+    cpm_export_variables(${CPM_ARGS_NAME})
+    return()
+  endif()
+
+  # Check for manual overrides
+  if(NOT CPM_ARGS_FORCE AND NOT "${CPM_${CPM_ARGS_NAME}_SOURCE}" STREQUAL "")
+    set(PACKAGE_SOURCE ${CPM_${CPM_ARGS_NAME}_SOURCE})
+    set(CPM_${CPM_ARGS_NAME}_SOURCE "")
+    CPMAddPackage(
+      NAME "${CPM_ARGS_NAME}"
+      SOURCE_DIR "${PACKAGE_SOURCE}"
+      EXCLUDE_FROM_ALL "${CPM_ARGS_EXCLUDE_FROM_ALL}"
+      SYSTEM "${CPM_ARGS_SYSTEM}"
+      OPTIONS "${CPM_ARGS_OPTIONS}"
+      SOURCE_SUBDIR "${CPM_ARGS_SOURCE_SUBDIR}"
+      DOWNLOAD_ONLY "${DOWNLOAD_ONLY}"
+      FORCE True
+    )
+    cpm_export_variables(${CPM_ARGS_NAME})
+    return()
+  endif()
+
+  # Check for available declaration
+  if(NOT CPM_ARGS_FORCE AND NOT "${CPM_DECLARATION_${CPM_ARGS_NAME}}" STREQUAL "")
+    set(declaration ${CPM_DECLARATION_${CPM_ARGS_NAME}})
+    set(CPM_DECLARATION_${CPM_ARGS_NAME} "")
+    CPMAddPackage(${declaration})
+    cpm_export_variables(${CPM_ARGS_NAME})
+    # checking again to ensure version and option compatibility
+    cpm_check_if_package_already_added(${CPM_ARGS_NAME} "${CPM_ARGS_VERSION}")
+    return()
+  endif()
+
+  if(NOT CPM_ARGS_FORCE)
+    if(CPM_USE_LOCAL_PACKAGES OR CPM_LOCAL_PACKAGES_ONLY)
+      cpm_find_package(${CPM_ARGS_NAME} "${CPM_ARGS_VERSION}" ${CPM_ARGS_FIND_PACKAGE_ARGUMENTS})
+
+      if(CPM_PACKAGE_FOUND)
+        cpm_export_variables(${CPM_ARGS_NAME})
+        return()
+      endif()
+
+      if(CPM_LOCAL_PACKAGES_ONLY)
+        message(
+          SEND_ERROR
+            "${CPM_INDENT} ${CPM_ARGS_NAME} not found via find_package(${CPM_ARGS_NAME} ${CPM_ARGS_VERSION})"
+        )
+      endif()
+    endif()
+  endif()
+
+  CPMRegisterPackage("${CPM_ARGS_NAME}" "${CPM_ARGS_VERSION}")
+
+  if(DEFINED CPM_ARGS_GIT_TAG)
+    set(PACKAGE_INFO "${CPM_ARGS_GIT_TAG}")
+  elseif(DEFINED CPM_ARGS_SOURCE_DIR)
+    set(PACKAGE_INFO "${CPM_ARGS_SOURCE_DIR}")
+  else()
+    set(PACKAGE_INFO "${CPM_ARGS_VERSION}")
+  endif()
+
+  if(DEFINED FETCHCONTENT_BASE_DIR)
+    # respect user's FETCHCONTENT_BASE_DIR if set
+    set(CPM_FETCHCONTENT_BASE_DIR ${FETCHCONTENT_BASE_DIR})
+  else()
+    set(CPM_FETCHCONTENT_BASE_DIR ${CMAKE_BINARY_DIR}/_deps)
+  endif()
+
+  if(DEFINED CPM_ARGS_DOWNLOAD_COMMAND)
+    list(APPEND CPM_ARGS_UNPARSED_ARGUMENTS DOWNLOAD_COMMAND ${CPM_ARGS_DOWNLOAD_COMMAND})
+  elseif(DEFINED CPM_ARGS_SOURCE_DIR)
+    list(APPEND CPM_ARGS_UNPARSED_ARGUMENTS SOURCE_DIR ${CPM_ARGS_SOURCE_DIR})
+    if(NOT IS_ABSOLUTE ${CPM_ARGS_SOURCE_DIR})
+      # Expand `CPM_ARGS_SOURCE_DIR` relative path. This is important because EXISTS doesn't work
+      # for relative paths.
+      get_filename_component(
+        source_directory ${CPM_ARGS_SOURCE_DIR} REALPATH BASE_DIR ${CMAKE_CURRENT_BINARY_DIR}
+      )
+    else()
+      set(source_directory ${CPM_ARGS_SOURCE_DIR})
+    endif()
+    if(NOT EXISTS ${source_directory})
+      string(TOLOWER ${CPM_ARGS_NAME} lower_case_name)
+      # remove timestamps so CMake will re-download the dependency
+      file(REMOVE_RECURSE "${CPM_FETCHCONTENT_BASE_DIR}/${lower_case_name}-subbuild")
+    endif()
+  elseif(CPM_SOURCE_CACHE AND NOT CPM_ARGS_NO_CACHE)
+    string(TOLOWER ${CPM_ARGS_NAME} lower_case_name)
+    set(origin_parameters ${CPM_ARGS_UNPARSED_ARGUMENTS})
+    list(SORT origin_parameters)
+    if(CPM_USE_NAMED_CACHE_DIRECTORIES)
+      string(SHA1 origin_hash "${origin_parameters};NEW_CACHE_STRUCTURE_TAG")
+      set(download_directory ${CPM_SOURCE_CACHE}/${lower_case_name}/${origin_hash}/${CPM_ARGS_NAME})
+    else()
+      string(SHA1 origin_hash "${origin_parameters}")
+      set(download_directory ${CPM_SOURCE_CACHE}/${lower_case_name}/${origin_hash})
+    endif()
+    # Expand `download_directory` relative path. This is important because EXISTS doesn't work for
+    # relative paths.
+    get_filename_component(download_directory ${download_directory} ABSOLUTE)
+    list(APPEND CPM_ARGS_UNPARSED_ARGUMENTS SOURCE_DIR ${download_directory})
+
+    if(CPM_SOURCE_CACHE)
+      file(LOCK ${download_directory}/../cmake.lock)
+    endif()
+
+    if(EXISTS ${download_directory})
+      if(CPM_SOURCE_CACHE)
+        file(LOCK ${download_directory}/../cmake.lock RELEASE)
+      endif()
+
+      cpm_store_fetch_properties(
+        ${CPM_ARGS_NAME} "${download_directory}"
+        "${CPM_FETCHCONTENT_BASE_DIR}/${lower_case_name}-build"
+      )
+      cpm_get_fetch_properties("${CPM_ARGS_NAME}")
+
+      if(DEFINED CPM_ARGS_GIT_TAG AND NOT (PATCH_COMMAND IN_LIST CPM_ARGS_UNPARSED_ARGUMENTS))
+        # warn if cache has been changed since checkout
+        cpm_check_git_working_dir_is_clean(${download_directory} ${CPM_ARGS_GIT_TAG} IS_CLEAN)
+        if(NOT ${IS_CLEAN})
+          message(
+            WARNING "${CPM_INDENT} Cache for ${CPM_ARGS_NAME} (${download_directory}) is dirty"
+          )
+        endif()
+      endif()
+
+      cpm_add_subdirectory(
+        "${CPM_ARGS_NAME}"
+        "${DOWNLOAD_ONLY}"
+        "${${CPM_ARGS_NAME}_SOURCE_DIR}/${CPM_ARGS_SOURCE_SUBDIR}"
+        "${${CPM_ARGS_NAME}_BINARY_DIR}"
+        "${CPM_ARGS_EXCLUDE_FROM_ALL}"
+        "${CPM_ARGS_SYSTEM}"
+        "${CPM_ARGS_OPTIONS}"
+      )
+      set(PACKAGE_INFO "${PACKAGE_INFO} at ${download_directory}")
+
+      # As the source dir is already cached/populated, we override the call to FetchContent.
+      set(CPM_SKIP_FETCH TRUE)
+      cpm_override_fetchcontent(
+        "${lower_case_name}" SOURCE_DIR "${${CPM_ARGS_NAME}_SOURCE_DIR}/${CPM_ARGS_SOURCE_SUBDIR}"
+        BINARY_DIR "${${CPM_ARGS_NAME}_BINARY_DIR}"
+      )
+
+    else()
+      # Enable shallow clone when GIT_TAG is not a commit hash. Our guess may not be accurate, but
+      # it should guarantee no commit hash get mis-detected.
+      if(NOT DEFINED CPM_ARGS_GIT_SHALLOW)
+        cpm_is_git_tag_commit_hash("${CPM_ARGS_GIT_TAG}" IS_HASH)
+        if(NOT ${IS_HASH})
+          list(APPEND CPM_ARGS_UNPARSED_ARGUMENTS GIT_SHALLOW TRUE)
+        endif()
+      endif()
+
+      # remove timestamps so CMake will re-download the dependency
+      file(REMOVE_RECURSE ${CPM_FETCHCONTENT_BASE_DIR}/${lower_case_name}-subbuild)
+      set(PACKAGE_INFO "${PACKAGE_INFO} to ${download_directory}")
+    endif()
+  endif()
+
+  cpm_create_module_file(${CPM_ARGS_NAME} "CPMAddPackage(\"${ARGN}\")")
+
+  if(CPM_PACKAGE_LOCK_ENABLED)
+    if((CPM_ARGS_VERSION AND NOT CPM_ARGS_SOURCE_DIR) OR CPM_INCLUDE_ALL_IN_PACKAGE_LOCK)
+      cpm_add_to_package_lock(${CPM_ARGS_NAME} "${ARGN}")
+    elseif(CPM_ARGS_SOURCE_DIR)
+      cpm_add_comment_to_package_lock(${CPM_ARGS_NAME} "local directory")
+    else()
+      cpm_add_comment_to_package_lock(${CPM_ARGS_NAME} "${ARGN}")
+    endif()
+  endif()
+
+  cpm_message(
+    STATUS "${CPM_INDENT} Adding package ${CPM_ARGS_NAME}@${CPM_ARGS_VERSION} (${PACKAGE_INFO})"
+  )
+
+  if(NOT CPM_SKIP_FETCH)
+    cpm_declare_fetch(
+      "${CPM_ARGS_NAME}" "${CPM_ARGS_VERSION}" "${PACKAGE_INFO}" "${CPM_ARGS_UNPARSED_ARGUMENTS}"
+    )
+    cpm_fetch_package("${CPM_ARGS_NAME}" populated)
+    if(CPM_SOURCE_CACHE AND download_directory)
+      file(LOCK ${download_directory}/../cmake.lock RELEASE)
+    endif()
+    if(${populated})
+      cpm_add_subdirectory(
+        "${CPM_ARGS_NAME}"
+        "${DOWNLOAD_ONLY}"
+        "${${CPM_ARGS_NAME}_SOURCE_DIR}/${CPM_ARGS_SOURCE_SUBDIR}"
+        "${${CPM_ARGS_NAME}_BINARY_DIR}"
+        "${CPM_ARGS_EXCLUDE_FROM_ALL}"
+        "${CPM_ARGS_SYSTEM}"
+        "${CPM_ARGS_OPTIONS}"
+      )
+    endif()
+    cpm_get_fetch_properties("${CPM_ARGS_NAME}")
+  endif()
+
+  set(${CPM_ARGS_NAME}_ADDED YES)
+  cpm_export_variables("${CPM_ARGS_NAME}")
+endfunction()
+
+# Fetch a previously declared package
+macro(CPMGetPackage Name)
+  if(DEFINED "CPM_DECLARATION_${Name}")
+    CPMAddPackage(NAME ${Name})
+  else()
+    message(SEND_ERROR "${CPM_INDENT} Cannot retrieve package ${Name}: no declaration available")
+  endif()
+endmacro()
+
+# export variables available to the caller to the parent scope expects ${CPM_ARGS_NAME} to be set
+macro(cpm_export_variables name)
+  set(${name}_SOURCE_DIR
+      "${${name}_SOURCE_DIR}"
+      PARENT_SCOPE
+  )
+  set(${name}_BINARY_DIR
+      "${${name}_BINARY_DIR}"
+      PARENT_SCOPE
+  )
+  set(${name}_ADDED
+      "${${name}_ADDED}"
+      PARENT_SCOPE
+  )
+  set(CPM_LAST_PACKAGE_NAME
+      "${name}"
+      PARENT_SCOPE
+  )
+endmacro()
+
+# declares a package, so that any call to CPMAddPackage for the package name will use these
+# arguments instead. Previous declarations will not be overridden.
+macro(CPMDeclarePackage Name)
+  if(NOT DEFINED "CPM_DECLARATION_${Name}")
+    set("CPM_DECLARATION_${Name}" "${ARGN}")
+  endif()
+endmacro()
+
+function(cpm_add_to_package_lock Name)
+  if(NOT CPM_DONT_CREATE_PACKAGE_LOCK)
+    cpm_prettify_package_arguments(PRETTY_ARGN false ${ARGN})
+    file(APPEND ${CPM_PACKAGE_LOCK_FILE} "# ${Name}\nCPMDeclarePackage(${Name}\n${PRETTY_ARGN})\n")
+  endif()
+endfunction()
+
+function(cpm_add_comment_to_package_lock Name)
+  if(NOT CPM_DONT_CREATE_PACKAGE_LOCK)
+    cpm_prettify_package_arguments(PRETTY_ARGN true ${ARGN})
+    file(APPEND ${CPM_PACKAGE_LOCK_FILE}
+         "# ${Name} (unversioned)\n# CPMDeclarePackage(${Name}\n${PRETTY_ARGN}#)\n"
+    )
+  endif()
+endfunction()
+
+# includes the package lock file if it exists and creates a target `cpm-update-package-lock` to
+# update it
+macro(CPMUsePackageLock file)
+  if(NOT CPM_DONT_CREATE_PACKAGE_LOCK)
+    get_filename_component(CPM_ABSOLUTE_PACKAGE_LOCK_PATH ${file} ABSOLUTE)
+    if(EXISTS ${CPM_ABSOLUTE_PACKAGE_LOCK_PATH})
+      include(${CPM_ABSOLUTE_PACKAGE_LOCK_PATH})
+    endif()
+    if(NOT TARGET cpm-update-package-lock)
+      add_custom_target(
+        cpm-update-package-lock COMMAND ${CMAKE_COMMAND} -E copy ${CPM_PACKAGE_LOCK_FILE}
+                                        ${CPM_ABSOLUTE_PACKAGE_LOCK_PATH}
+      )
+    endif()
+    set(CPM_PACKAGE_LOCK_ENABLED true)
+  endif()
+endmacro()
+
+# registers a package that has been added to CPM
+function(CPMRegisterPackage PACKAGE VERSION)
+  list(APPEND CPM_PACKAGES ${PACKAGE})
+  set(CPM_PACKAGES
+      ${CPM_PACKAGES}
+      CACHE INTERNAL ""
+  )
+  set("CPM_PACKAGE_${PACKAGE}_VERSION"
+      ${VERSION}
+      CACHE INTERNAL ""
+  )
+endfunction()
+
+# retrieve the current version of the package to ${OUTPUT}
+function(CPMGetPackageVersion PACKAGE OUTPUT)
+  set(${OUTPUT}
+      "${CPM_PACKAGE_${PACKAGE}_VERSION}"
+      PARENT_SCOPE
+  )
+endfunction()
+
+# declares a package in FetchContent_Declare
+function(cpm_declare_fetch PACKAGE VERSION INFO)
+  if(${CPM_DRY_RUN})
+    cpm_message(STATUS "${CPM_INDENT} Package not declared (dry run)")
+    return()
+  endif()
+
+  FetchContent_Declare(${PACKAGE} ${ARGN})
+endfunction()
+
+# returns properties for a package previously defined by cpm_declare_fetch
+function(cpm_get_fetch_properties PACKAGE)
+  if(${CPM_DRY_RUN})
+    return()
+  endif()
+
+  set(${PACKAGE}_SOURCE_DIR
+      "${CPM_PACKAGE_${PACKAGE}_SOURCE_DIR}"
+      PARENT_SCOPE
+  )
+  set(${PACKAGE}_BINARY_DIR
+      "${CPM_PACKAGE_${PACKAGE}_BINARY_DIR}"
+      PARENT_SCOPE
+  )
+endfunction()
+
+function(cpm_store_fetch_properties PACKAGE source_dir binary_dir)
+  if(${CPM_DRY_RUN})
+    return()
+  endif()
+
+  set(CPM_PACKAGE_${PACKAGE}_SOURCE_DIR
+      "${source_dir}"
+      CACHE INTERNAL ""
+  )
+  set(CPM_PACKAGE_${PACKAGE}_BINARY_DIR
+      "${binary_dir}"
+      CACHE INTERNAL ""
+  )
+endfunction()
+
+# adds a package as a subdirectory if viable, according to provided options
+function(
+  cpm_add_subdirectory
+  PACKAGE
+  DOWNLOAD_ONLY
+  SOURCE_DIR
+  BINARY_DIR
+  EXCLUDE
+  SYSTEM
+  OPTIONS
+)
+
+  if(NOT DOWNLOAD_ONLY AND EXISTS ${SOURCE_DIR}/CMakeLists.txt)
+    set(addSubdirectoryExtraArgs "")
+    if(EXCLUDE)
+      list(APPEND addSubdirectoryExtraArgs EXCLUDE_FROM_ALL)
+    endif()
+    if("${SYSTEM}" AND "${CMAKE_VERSION}" VERSION_GREATER_EQUAL "3.25")
+      # https://cmake.org/cmake/help/latest/prop_dir/SYSTEM.html#prop_dir:SYSTEM
+      list(APPEND addSubdirectoryExtraArgs SYSTEM)
+    endif()
+    if(OPTIONS)
+      foreach(OPTION ${OPTIONS})
+        cpm_parse_option("${OPTION}")
+        set(${OPTION_KEY} "${OPTION_VALUE}")
+      endforeach()
+    endif()
+    set(CPM_OLD_INDENT "${CPM_INDENT}")
+    set(CPM_INDENT "${CPM_INDENT} ${PACKAGE}:")
+    add_subdirectory(${SOURCE_DIR} ${BINARY_DIR} ${addSubdirectoryExtraArgs})
+    set(CPM_INDENT "${CPM_OLD_INDENT}")
+  endif()
+endfunction()
+
+# downloads a previously declared package via FetchContent and exports the variables
+# `${PACKAGE}_SOURCE_DIR` and `${PACKAGE}_BINARY_DIR` to the parent scope
+function(cpm_fetch_package PACKAGE populated)
+  set(${populated}
+      FALSE
+      PARENT_SCOPE
+  )
+  if(${CPM_DRY_RUN})
+    cpm_message(STATUS "${CPM_INDENT} Package ${PACKAGE} not fetched (dry run)")
+    return()
+  endif()
+
+  FetchContent_GetProperties(${PACKAGE})
+
+  string(TOLOWER "${PACKAGE}" lower_case_name)
+
+  if(NOT ${lower_case_name}_POPULATED)
+    FetchContent_Populate(${PACKAGE})
+    set(${populated}
+        TRUE
+        PARENT_SCOPE
+    )
+  endif()
+
+  cpm_store_fetch_properties(
+    ${CPM_ARGS_NAME} ${${lower_case_name}_SOURCE_DIR} ${${lower_case_name}_BINARY_DIR}
+  )
+
+  set(${PACKAGE}_SOURCE_DIR
+      ${${lower_case_name}_SOURCE_DIR}
+      PARENT_SCOPE
+  )
+  set(${PACKAGE}_BINARY_DIR
+      ${${lower_case_name}_BINARY_DIR}
+      PARENT_SCOPE
+  )
+endfunction()
+
+# splits a package option
+function(cpm_parse_option OPTION)
+  string(REGEX MATCH "^[^ ]+" OPTION_KEY "${OPTION}")
+  string(LENGTH "${OPTION}" OPTION_LENGTH)
+  string(LENGTH "${OPTION_KEY}" OPTION_KEY_LENGTH)
+  if(OPTION_KEY_LENGTH STREQUAL OPTION_LENGTH)
+    # no value for key provided, assume user wants to set option to "ON"
+    set(OPTION_VALUE "ON")
+  else()
+    math(EXPR OPTION_KEY_LENGTH "${OPTION_KEY_LENGTH}+1")
+    string(SUBSTRING "${OPTION}" "${OPTION_KEY_LENGTH}" "-1" OPTION_VALUE)
+  endif()
+  set(OPTION_KEY
+      "${OPTION_KEY}"
+      PARENT_SCOPE
+  )
+  set(OPTION_VALUE
+      "${OPTION_VALUE}"
+      PARENT_SCOPE
+  )
+endfunction()
+
+# guesses the package version from a git tag
+function(cpm_get_version_from_git_tag GIT_TAG RESULT)
+  string(LENGTH ${GIT_TAG} length)
+  if(length EQUAL 40)
+    # GIT_TAG is probably a git hash
+    set(${RESULT}
+        0
+        PARENT_SCOPE
+    )
+  else()
+    string(REGEX MATCH "v?([0123456789.]*).*" _ ${GIT_TAG})
+    set(${RESULT}
+        ${CMAKE_MATCH_1}
+        PARENT_SCOPE
+    )
+  endif()
+endfunction()
+
+# guesses if the git tag is a commit hash or an actual tag or a branch name.
+function(cpm_is_git_tag_commit_hash GIT_TAG RESULT)
+  string(LENGTH "${GIT_TAG}" length)
+  # full hash has 40 characters, and short hash has at least 7 characters.
+  if(length LESS 7 OR length GREATER 40)
+    set(${RESULT}
+        0
+        PARENT_SCOPE
+    )
+  else()
+    if(${GIT_TAG} MATCHES "^[a-fA-F0-9]+$")
+      set(${RESULT}
+          1
+          PARENT_SCOPE
+      )
+    else()
+      set(${RESULT}
+          0
+          PARENT_SCOPE
+      )
+    endif()
+  endif()
+endfunction()
+
+function(cpm_prettify_package_arguments OUT_VAR IS_IN_COMMENT)
+  set(oneValueArgs
+      NAME
+      FORCE
+      VERSION
+      GIT_TAG
+      DOWNLOAD_ONLY
+      GITHUB_REPOSITORY
+      GITLAB_REPOSITORY
+      BITBUCKET_REPOSITORY
+      GIT_REPOSITORY
+      SOURCE_DIR
+      FIND_PACKAGE_ARGUMENTS
+      NO_CACHE
+      SYSTEM
+      GIT_SHALLOW
+      EXCLUDE_FROM_ALL
+      SOURCE_SUBDIR
+  )
+  set(multiValueArgs URL OPTIONS DOWNLOAD_COMMAND)
+  cmake_parse_arguments(CPM_ARGS "" "${oneValueArgs}" "${multiValueArgs}" ${ARGN})
+
+  foreach(oneArgName ${oneValueArgs})
+    if(DEFINED CPM_ARGS_${oneArgName})
+      if(${IS_IN_COMMENT})
+        string(APPEND PRETTY_OUT_VAR "#")
+      endif()
+      if(${oneArgName} STREQUAL "SOURCE_DIR")
+        string(REPLACE ${CMAKE_SOURCE_DIR} "\${CMAKE_SOURCE_DIR}" CPM_ARGS_${oneArgName}
+                       ${CPM_ARGS_${oneArgName}}
+        )
+      endif()
+      string(APPEND PRETTY_OUT_VAR "  ${oneArgName} ${CPM_ARGS_${oneArgName}}\n")
+    endif()
+  endforeach()
+  foreach(multiArgName ${multiValueArgs})
+    if(DEFINED CPM_ARGS_${multiArgName})
+      if(${IS_IN_COMMENT})
+        string(APPEND PRETTY_OUT_VAR "#")
+      endif()
+      string(APPEND PRETTY_OUT_VAR "  ${multiArgName}\n")
+      foreach(singleOption ${CPM_ARGS_${multiArgName}})
+        if(${IS_IN_COMMENT})
+          string(APPEND PRETTY_OUT_VAR "#")
+        endif()
+        string(APPEND PRETTY_OUT_VAR "    \"${singleOption}\"\n")
+      endforeach()
+    endif()
+  endforeach()
+
+  if(NOT "${CPM_ARGS_UNPARSED_ARGUMENTS}" STREQUAL "")
+    if(${IS_IN_COMMENT})
+      string(APPEND PRETTY_OUT_VAR "#")
+    endif()
+    string(APPEND PRETTY_OUT_VAR " ")
+    foreach(CPM_ARGS_UNPARSED_ARGUMENT ${CPM_ARGS_UNPARSED_ARGUMENTS})
+      string(APPEND PRETTY_OUT_VAR " ${CPM_ARGS_UNPARSED_ARGUMENT}")
+    endforeach()
+    string(APPEND PRETTY_OUT_VAR "\n")
+  endif()
+
+  set(${OUT_VAR}
+      ${PRETTY_OUT_VAR}
+      PARENT_SCOPE
+  )
+
+endfunction()
diff --git a/include/Engine/Animation.h b/include/Engine/Animation.h
new file mode 100644
index 0000000..579e12c
--- /dev/null
+++ b/include/Engine/Animation.h
@@ -0,0 +1,23 @@
+#pragma once
+
+#include "JGL/types/Texture.h"
+
+using JGL::Texture;
+
+class Animation {
+protected:
+    std::string name{};
+    float ms_between_frames = 1.0f;
+    std::vector<Texture> textures{};
+public:
+    [[nodiscard]] std::string GetName() const;
+    [[nodiscard]] float GetMsBetweenFrames() const;
+
+    /// @param animation_time a float from 0 to 1. 0 being the beginning of the animation and 1 being the end.
+    [[nodiscard]] const JGL::Texture* GetTexture(float animation_time) const;
+public:
+    void SetMsBetweenFrames(float new_ms_between_frames);
+public:
+    Animation(const std::string& name, float ms_between_frames, std::vector<Texture>& textures) : name(name), ms_between_frames(ms_between_frames), textures(textures) {};
+    ~Animation() = default;
+};
\ No newline at end of file
diff --git a/include/Engine/Entity/Camera.h b/include/Engine/Entity/Camera.h
new file mode 100644
index 0000000..cab3339
--- /dev/null
+++ b/include/Engine/Entity/Camera.h
@@ -0,0 +1,7 @@
+#include "J3ML/LinearAlgebra/Vector2.hpp"
+#include "Entity.h"
+#pragma once
+
+class Camera : public Entity {
+
+};
diff --git a/include/Engine/Entity/Entity.h b/include/Engine/Entity/Entity.h
new file mode 100644
index 0000000..9da6846
--- /dev/null
+++ b/include/Engine/Entity/Entity.h
@@ -0,0 +1,37 @@
+#pragma once
+#include "J3ML/LinearAlgebra/Vector2.hpp"
+#include <vector>
+
+class Entity {
+protected:
+    std::vector<Entity*> children{};
+    Vector2 position = {0, 0};
+    // Assuming 0 radians is up.
+    float face_angle = 0.0f;
+    void UpdateChildren();
+public:
+    // Movements independent of the rotation.
+    void MoveX(float speed);
+    void MoveY(float speed);
+
+    // Movements dependent on face angle.
+    void MoveForward(float speed);
+    void MoveBackward(float speed);
+    void MoveLeft(float speed);
+    void MoveRight(float speed);
+
+    void Rotate(float speed);
+    void SetRotation(float new_rotation);
+
+    [[nodiscard]] bool AppendChild(Entity* entity);
+    void DestroyChild(Entity* entity);
+    void RemoveChild(Entity* entity);
+public:
+    [[nodiscard]] float GetRotation() const;
+    [[nodiscard]] Vector2 GetPosition() const;
+public:
+    virtual void Update() {}
+public:
+    explicit Entity(const Vector2& position, float rotation = 0.0f) : position(position), face_angle(rotation) {}
+    virtual ~Entity();
+};
\ No newline at end of file
diff --git a/include/Engine/Entity/Hud.h b/include/Engine/Entity/Hud.h
new file mode 100644
index 0000000..979a5de
--- /dev/null
+++ b/include/Engine/Entity/Hud.h
@@ -0,0 +1,7 @@
+#pragma once
+#include "Renderable.h"
+
+class Hud : public Renderable {
+public:
+    Hud() : Renderable({0, 0}, 0) {};
+};
diff --git a/include/Engine/Entity/Renderable.h b/include/Engine/Entity/Renderable.h
new file mode 100644
index 0000000..0deb15a
--- /dev/null
+++ b/include/Engine/Entity/Renderable.h
@@ -0,0 +1,11 @@
+#pragma once
+
+#include "Entity.h"
+#include "JGL/JGL.h"
+
+class Renderable : public Entity {
+public:
+    virtual void Render() {}
+public:
+    explicit Renderable(const Vector2& position, float rotation = 0.0f) : Entity(position, rotation) {}
+};
\ No newline at end of file
diff --git a/include/Engine/GameWindow.h b/include/Engine/GameWindow.h
new file mode 100644
index 0000000..c1f1659
--- /dev/null
+++ b/include/Engine/GameWindow.h
@@ -0,0 +1,15 @@
+#include <rewindow/types/window.h>
+#pragma once
+
+class Camera;
+class DemoGameWindow : public ReWindow::RWindow {
+public:
+    void InitGL();
+    void Display();
+public:
+    void OnRefresh(float elapsed) override;
+public:
+    DemoGameWindow() : ReWindow::RWindow() {}
+    DemoGameWindow(const std::string& title, int width, int height) : ReWindow::RWindow(title, width, height) {}
+
+};
\ No newline at end of file
diff --git a/include/Engine/Globals.h b/include/Engine/Globals.h
new file mode 100644
index 0000000..39adcc8
--- /dev/null
+++ b/include/Engine/Globals.h
@@ -0,0 +1,13 @@
+#pragma once
+
+#include <Engine/Level/Scene.h>
+#include <Engine/GameWindow.h>
+
+namespace Globals {
+    inline Scene* CurrentScene = nullptr;
+    inline DemoGameWindow* Window = nullptr;
+
+    inline float DeltaTime() { return Window->GetDeltaTime(); }
+    inline void RemoveScene() { delete CurrentScene; CurrentScene = nullptr; }
+    inline void ChangeScene(Scene* scene) { delete CurrentScene; CurrentScene = scene; CurrentScene->Init(); }
+}
diff --git a/include/Engine/Level/Fixed.h b/include/Engine/Level/Fixed.h
new file mode 100644
index 0000000..923527e
--- /dev/null
+++ b/include/Engine/Level/Fixed.h
@@ -0,0 +1,36 @@
+#pragma once
+
+#include "J3ML/LinearAlgebra/Vector2i.hpp"
+#include "J3ML/Geometry/AABB2D.hpp"
+#include "JGL/types/Texture.h"
+
+using J3ML::LinearAlgebra::Vector2i;
+using JGL::Texture;
+
+// Things that are considered non-movable parts of the level.
+// TODO instanced textures.
+class Fixed {
+private:
+    void GenerateCollision();
+protected:
+    std::vector<Vector2i> collision{};
+    bool enabled = false;
+    bool collidable = false;
+    Vector2i position = {0, 0};
+    const Texture* texture = nullptr;
+public:
+    [[nodiscard]] bool Collidable() const;
+    [[nodiscard]] Vector2i GetPosition() const;
+    [[nodiscard]] AABB2D GetBounds() const;
+    [[nodiscard]] bool Enabled() const;
+    [[nodiscard]] std::vector<Vector2i> GetCollision();
+    [[nodiscard]] const Texture* GetTexture();
+public:
+    void Enable();
+    void Disable();
+    virtual void Render() {};
+public:
+    Fixed(const Vector2i& position, bool enabled, bool collidable, const Texture* texture) : position(position), enabled(enabled), collidable(collidable), texture(texture)
+    { if (collidable) GenerateCollision(); }
+    virtual ~Fixed();
+};
\ No newline at end of file
diff --git a/include/Engine/Level/Scene.h b/include/Engine/Level/Scene.h
new file mode 100644
index 0000000..711a935
--- /dev/null
+++ b/include/Engine/Level/Scene.h
@@ -0,0 +1,37 @@
+#pragma once
+
+#include <vector>
+#include <Engine/Entity/Renderable.h>
+#include <Engine/Entity/Hud.h>
+#include <Engine/Level/Fixed.h>
+
+class Scene {
+protected:
+    bool Paused = false;
+    Hud* HeadsUpDisplay = nullptr;
+    std::vector<Fixed*> FixedList{};
+    std::vector<Entity*> EntityList{};
+public:
+    [[nodiscard]] bool EntityListContains(const Entity* entity) const;
+    [[nodiscard]] bool FixedListContains(const Fixed* fixed) const;
+    [[nodiscard]] size_t FixedCount() const;
+    [[nodiscard]] size_t EntityCount() const;
+public:
+    void AppendEntity(Entity* entity);
+    void AppendFixed(Fixed* fixed);
+
+    // Removes and deallocates.
+    void DestroyEntity(Entity* entity);
+    void DestroyFixed(Fixed* fixed);
+
+    // Only removes from the list.
+    void RemoveEntity(Entity* entity);
+    void RemoveFixed(Fixed* fixed);
+
+    virtual void Init() {}
+    virtual void Update();
+    virtual void Render();
+public:
+    Scene() = default;
+    virtual ~Scene();
+};
diff --git a/include/Game/Entity/Box.h b/include/Game/Entity/Box.h
new file mode 100644
index 0000000..6d78abe
--- /dev/null
+++ b/include/Game/Entity/Box.h
@@ -0,0 +1,11 @@
+#pragma once
+
+#include <Engine/Entity/Renderable.h>
+#include "Engine/Globals.h"
+class Box final : public Renderable {
+public:
+    void Render() final;
+    void Update() final;
+public:
+    explicit Box(const Vector2& position, float rotation = 0.0f) : Renderable(position, rotation) {}
+};
\ No newline at end of file
diff --git a/include/Game/Entity/DemoGameHud.h b/include/Game/Entity/DemoGameHud.h
new file mode 100644
index 0000000..9736b8b
--- /dev/null
+++ b/include/Game/Entity/DemoGameHud.h
@@ -0,0 +1,10 @@
+#include <Engine/Entity/Hud.h>
+
+class DemoGameHud : public Hud {
+public:
+    void Render() override;
+public:
+    DemoGameHud() : Hud() {}
+};
+
+
diff --git a/include/Game/Scene/DemoGameScene.h b/include/Game/Scene/DemoGameScene.h
new file mode 100644
index 0000000..2e8bc0a
--- /dev/null
+++ b/include/Game/Scene/DemoGameScene.h
@@ -0,0 +1,12 @@
+#pragma once
+#include "Engine/Level/Scene.h"
+
+class DemoGameScene final : public Scene {
+public:
+    void Init() final;
+public:
+    DemoGameScene() = default;
+
+};
+
+
diff --git a/include/Game/Scene/Splash.h b/include/Game/Scene/Splash.h
new file mode 100644
index 0000000..b0520f2
--- /dev/null
+++ b/include/Game/Scene/Splash.h
@@ -0,0 +1,16 @@
+#pragma once
+#include "Engine/Level/Scene.h"
+
+class DemoGameSplash final : public Scene {
+protected:
+    float elapsed = 0.0f;
+    float angle = 0.0f;
+    Texture* RedactedSoftware = nullptr;
+public:
+    DemoGameSplash() : Scene() {}
+
+    void Init() final;
+    void Update() final;
+    void Render() final;
+    ~DemoGameSplash() final;
+};
diff --git a/main.cpp b/main.cpp
new file mode 100644
index 0000000..b200585
--- /dev/null
+++ b/main.cpp
@@ -0,0 +1,26 @@
+#include "Engine/Globals.h"
+#include <Engine/Level/Scene.h>
+#include <rewindow/logger/logger.h>
+#include "Game/Scene/Splash.h"
+
+Scene* scene = nullptr;
+
+using namespace JGL;
+
+int main() {
+    Globals::Window = new DemoGameWindow("Demo Game", 1024, 896);
+    Globals::Window->SetRenderer(RenderingAPI::OPENGL);
+    Globals::Window->Open();
+    Globals::Window->InitGL();
+    Globals::Window->SetResizable(false);
+    Globals::Window->SetVsyncEnabled(false);
+    ReWindow::Logger::Error.EnableConsole(false);
+    ReWindow::Logger::Warning.EnableConsole(false);
+    ReWindow::Logger::Debug.EnableConsole(false);
+
+    auto* splash = new DemoGameSplash();
+    Globals::ChangeScene(splash);
+
+    while (Globals::Window->IsAlive())
+        Globals::Window->ManagedRefresh();
+}
diff --git a/src/Engine/Animation.cpp b/src/Engine/Animation.cpp
new file mode 100644
index 0000000..a59f8d8
--- /dev/null
+++ b/src/Engine/Animation.cpp
@@ -0,0 +1,27 @@
+#include "Engine/Animation.h"
+#include "jlog/Logger.hpp"
+
+float Animation::GetMsBetweenFrames() const {
+    return ms_between_frames;
+}
+
+void Animation::SetMsBetweenFrames(float new_ms_between_frames) {
+    ms_between_frames = new_ms_between_frames;
+}
+
+std::string Animation::GetName() const {
+    return name;
+}
+
+const JGL::Texture* Animation::GetTexture(float animation_time) const {
+    if (textures.empty())
+        jlog::Fatal("Getting an animation frame but the animation is empty?");
+
+    animation_time = std::max(0.0f, std::min(animation_time, 1.0f));
+    float animation_ms = ms_between_frames * textures.size();
+    float animation_length_ms = animation_time * animation_ms;
+    auto frame_index = (size_t) std::floor(animation_length_ms / ms_between_frames);
+    frame_index = std::min(frame_index, textures.size() - 1);
+
+    return &textures[frame_index];
+}
diff --git a/src/Engine/Entity/Camera.cpp b/src/Engine/Entity/Camera.cpp
new file mode 100644
index 0000000..e69de29
diff --git a/src/Engine/Entity/Entity.cpp b/src/Engine/Entity/Entity.cpp
new file mode 100644
index 0000000..86a8d58
--- /dev/null
+++ b/src/Engine/Entity/Entity.cpp
@@ -0,0 +1,88 @@
+#include "J3ML/J3ML.hpp"
+#include "Engine/Entity/Entity.h"
+#include "Engine/Globals.h"
+
+using namespace J3ML;
+void Entity::MoveX(float speed) {
+    position.x = position.x + (speed * Globals::Window->GetDeltaTime());
+}
+
+void Entity::MoveY(float speed) {
+    position.y = position.y + (speed * Globals::DeltaTime());
+}
+
+void Entity::MoveForward(float speed) {
+    position.x = position.x + (speed * Globals::DeltaTime()) * Math::Cos(face_angle);
+    position.y = position.y + (speed * Globals::DeltaTime()) * Math::Sin(face_angle);
+}
+
+void Entity::MoveBackward(float speed) {
+    speed = -speed;
+    position.x = position.x + (speed * Globals::DeltaTime()) * Math::Cos(face_angle);
+    position.y = position.y + (speed * Globals::DeltaTime()) * Math::Sin(face_angle);
+}
+
+void Entity::MoveLeft(float speed) {
+    position.x = position.x + (speed * Globals::DeltaTime()) * -Math::Sin(face_angle);
+    position.y = position.y + (speed * Globals::DeltaTime()) * Math::Cos(face_angle);
+}
+
+void Entity::MoveRight(float speed) {
+    position.x = position.x + (speed * Globals::DeltaTime()) * Math::Sin(face_angle);
+    position.y = position.y + (speed * Globals::DeltaTime()) * -Math::Cos(face_angle);
+}
+
+void Entity::SetRotation(float new_face_angle) {
+    face_angle = new_face_angle;
+
+    if (face_angle < 0)
+        face_angle = fmod(face_angle + Math::Pi * 2, Math::Pi * 2);
+    else if (face_angle >= 2 * M_PI)
+        face_angle = fmod(face_angle, Math::Pi * 2);
+}
+
+void Entity::Rotate(float speed) {
+    SetRotation(face_angle + speed * Globals::DeltaTime());
+}
+
+float Entity::GetRotation() const {
+    return face_angle;
+}
+
+Vector2 Entity::GetPosition() const {
+    return position;
+}
+
+bool Entity::AppendChild(Entity* entity) {
+    bool success = false;
+    if (!Globals::CurrentScene->EntityListContains(entity))
+        children.push_back(entity), success = true;
+    return success;
+}
+
+Entity::~Entity() {
+    for (auto* e : children)
+        delete e;
+
+    children = {};
+}
+
+void Entity::UpdateChildren() {
+    for (auto& e : children) {
+        e->Update();
+        if (!e->children.empty())
+            e->UpdateChildren();
+    }
+}
+
+void Entity::DestroyChild(Entity* entity) {
+    auto it = std::find(children.begin(), children.end(), entity);
+    if (it != children.end())
+        delete *it, children.erase(it);
+}
+
+void Entity::RemoveChild(Entity* entity) {
+    auto it = std::find(children.begin(), children.end(), entity);
+    if (it != children.end())
+        children.erase(it);
+}
diff --git a/src/Engine/Entity/Renderable.cpp b/src/Engine/Entity/Renderable.cpp
new file mode 100644
index 0000000..8b13789
--- /dev/null
+++ b/src/Engine/Entity/Renderable.cpp
@@ -0,0 +1 @@
+
diff --git a/src/Engine/GameWindow.cpp b/src/Engine/GameWindow.cpp
new file mode 100644
index 0000000..34812f4
--- /dev/null
+++ b/src/Engine/GameWindow.cpp
@@ -0,0 +1,32 @@
+#include "Engine/GameWindow.h"
+#include "Engine/Globals.h"
+#include "Engine/Entity/Camera.h"
+#include "JGL/JGL.h"
+
+
+void DemoGameWindow::InitGL() {
+    if (!JGL::Init(GetSize(), 0, 0))
+        exit(-1);
+
+    glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
+}
+
+void DemoGameWindow::Display() {
+    JGL::Update(GetSize());
+
+    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+    glMatrixMode(GL_MODELVIEW);
+    glLoadIdentity();
+
+    // These are checked separately so that if Update() changes the scene we don't crash.
+    if (Globals::CurrentScene)
+        Globals::CurrentScene->Update();
+    if (Globals::CurrentScene)
+        Globals::CurrentScene->Render();
+
+    DemoGameWindow::GLSwapBuffers();
+}
+
+void DemoGameWindow::OnRefresh(float elapsed) {
+    Display();
+}
diff --git a/src/Engine/Level/Fixed.cpp b/src/Engine/Level/Fixed.cpp
new file mode 100644
index 0000000..d5694c9
--- /dev/null
+++ b/src/Engine/Level/Fixed.cpp
@@ -0,0 +1,52 @@
+#include "Engine/Level/Fixed.h"
+
+bool Fixed::Collidable() const {
+    return collidable;
+}
+
+Vector2i Fixed::GetPosition() const {
+    return position;
+}
+
+AABB2D Fixed::GetBounds() const {
+    auto maximum = Vector2(position.x + texture->GetDimensions().x, position.y + texture->GetDimensions().y);
+    return { Vector2(position), maximum };
+}
+
+bool Fixed::Enabled() const {
+    return enabled;
+}
+
+void Fixed::Enable() {
+    enabled = true;
+}
+
+void Fixed::Disable() {
+    enabled = false;
+}
+
+Fixed::~Fixed() {
+    delete texture;
+}
+
+void Fixed::GenerateCollision() {
+    if (!Collidable() || !Enabled() || !texture)
+        return;
+
+    std::vector<Vector2i> result{};
+    auto pixel_data = texture->GetPixelData();
+
+    for (int y = 0; y < texture->GetDimensions().y; y++)
+        for (int x = 0; x < texture->GetDimensions().x; x++)
+            if (pixel_data[y * texture->GetDimensions().x + x].A() != 0)
+                result.emplace_back((int) x + position.x, (int) y + position.y);
+    collision = result;
+}
+
+std::vector<Vector2i> Fixed::GetCollision() {
+    return collision;
+}
+
+const Texture* Fixed::GetTexture() {
+    return texture;
+}
diff --git a/src/Engine/Level/Scene.cpp b/src/Engine/Level/Scene.cpp
new file mode 100644
index 0000000..07cbccf
--- /dev/null
+++ b/src/Engine/Level/Scene.cpp
@@ -0,0 +1,86 @@
+#include "Engine/Level/Scene.h"
+
+bool Scene::EntityListContains(const Entity* entity) const {
+    for (auto* e : EntityList)
+        if (e == entity)
+            return true;
+    return false;
+}
+
+bool Scene::FixedListContains(const Fixed* fixed) const {
+    for (auto* f : FixedList)
+        if (f == fixed)
+            return true;
+    return false;
+}
+
+size_t Scene::FixedCount() const {
+    return FixedList.size();
+}
+
+size_t Scene::EntityCount() const {
+    return EntityList.size();
+}
+
+void Scene::Update() {
+    for (auto& e : EntityList)
+        e->Update();
+}
+
+void Scene::Render() {
+    for (auto& f : FixedList)
+        if (f->Enabled())
+            f->Render();
+
+    // TODO Render order. In this system it's not possible for child entities to be rendered before the parent.
+    for (auto& e : EntityList)
+        if (auto* r = dynamic_cast<Renderable*>(e))
+            r->Render();
+
+    if (HeadsUpDisplay)
+        HeadsUpDisplay->Render();
+}
+
+Scene::~Scene() {
+    for (auto* f : FixedList)
+        delete f;
+
+    for (auto* e : EntityList)
+        delete e;
+}
+
+void Scene::AppendEntity(Entity* entity) {
+    if (!EntityListContains(entity))
+        EntityList.push_back(entity);
+}
+
+void Scene::AppendFixed(Fixed* fixed) {
+    if (!FixedListContains(fixed))
+        FixedList.push_back(fixed);
+}
+
+void Scene::DestroyEntity(Entity *entity) {
+    auto it = std::find(EntityList.begin(), EntityList.end(), entity);
+    if (it != EntityList.end())
+        delete *it, EntityList.erase(it);
+}
+
+void Scene::DestroyFixed(Fixed* fixed) {
+    auto it = std::find(FixedList.begin(), FixedList.end(), fixed);
+    if (it != FixedList.end())
+        delete *it, FixedList.erase(it);
+}
+
+void Scene::RemoveEntity(Entity* entity) {
+    auto it = std::find(EntityList.begin(), EntityList.end(), entity);
+    if (it != EntityList.end())
+        EntityList.erase(it);
+}
+
+
+void Scene::RemoveFixed(Fixed* fixed) {
+    auto it = std::find(FixedList.begin(), FixedList.end(), fixed);
+    if (it != FixedList.end())
+        FixedList.erase(it);
+}
+
diff --git a/src/Game/DemoGameScene.cpp b/src/Game/DemoGameScene.cpp
new file mode 100644
index 0000000..6deaf2e
--- /dev/null
+++ b/src/Game/DemoGameScene.cpp
@@ -0,0 +1,11 @@
+#include <Game/Scene/DemoGameScene.h>
+#include <Game/Entity/DemoGameHud.h>
+#include <Game/Entity/Box.h>
+
+void DemoGameScene::Init() {
+    auto* hud = new DemoGameHud();
+    auto* b = new Box({0, 0});
+
+    HeadsUpDisplay = hud;
+    AppendEntity(b);
+}
diff --git a/src/Game/Entities/Box.cpp b/src/Game/Entities/Box.cpp
new file mode 100644
index 0000000..afd7ae1
--- /dev/null
+++ b/src/Game/Entities/Box.cpp
@@ -0,0 +1,18 @@
+#include <Game/Entity/Box.h>
+
+void Box::Render() {
+    J2D::Begin(nullptr, true);
+        J2D::FillRect(Colors::Red, Vector2(position), {20, 20});
+    J2D::End();
+}
+
+void Box::Update() {
+    if (Globals::Window->IsKeyDown(Keys::W))
+        MoveY(-500);
+    if (Globals::Window->IsKeyDown(Keys::S))
+        MoveY(500);
+    if (Globals::Window->IsKeyDown(Keys::A))
+        MoveX(-500);
+    if (Globals::Window->IsKeyDown(Keys::D))
+        MoveX(500);
+    }
\ No newline at end of file
diff --git a/src/Game/Entities/DemoGameHud.cpp b/src/Game/Entities/DemoGameHud.cpp
new file mode 100644
index 0000000..d83a10d
--- /dev/null
+++ b/src/Game/Entities/DemoGameHud.cpp
@@ -0,0 +1,9 @@
+#include <Game/Entity/DemoGameHud.h>
+#include <Engine/Globals.h>
+
+void DemoGameHud::Render() {
+    float framerate = Globals::Window->GetRefreshRate();
+    J2D::Begin(nullptr, true);
+        J2D::DrawString(Colors::Whites::Ivory, "Framerate: " + std::to_string((int) framerate), 0, 0, 1, 16);
+    J2D::End();
+}
diff --git a/src/Game/Splash.cpp b/src/Game/Splash.cpp
new file mode 100644
index 0000000..99bcafb
--- /dev/null
+++ b/src/Game/Splash.cpp
@@ -0,0 +1,38 @@
+#include "Game/Scene/Splash.h"
+#include "Engine/Globals.h"
+#include "Game/Scene/DemoGameScene.h"
+
+void DemoGameSplash::Init() {
+    RedactedSoftware = new JGL::Texture("assets/sprites/Re3D.png");
+}
+
+void DemoGameSplash::Update() {
+        angle += (elapsed * 4) * Globals::DeltaTime();
+    elapsed += Globals::DeltaTime();
+
+    // Pretend we're actually loading something idk.
+    if (elapsed >= 2.75) {
+        auto* dgs = new DemoGameScene();
+        Globals::ChangeScene(dgs);
+    }
+}
+
+void DemoGameSplash::Render() {
+    auto text_length = JGL::Fonts::Jupiteroid.MeasureString("Loading ....", 24);
+    std::string text = "Loading";
+    int dots = static_cast<int>(floor(elapsed / 0.35)) % 4;
+    for (int i = 0; i < dots; ++i)
+        text += ".";
+
+    J2D::Begin(nullptr, true);
+        J2D::DrawSprite(RedactedSoftware, {Globals::Window->GetSize().x - RedactedSoftware->GetDimensions().x, Globals::Window->GetSize().y - RedactedSoftware->GetDimensions().y}, angle, {0.5, 0.5});
+        J2D::DrawString(Colors::Whites::Ivory, text, (Globals::Window->GetSize().x - text_length.x) - RedactedSoftware->GetDimensions().x , Globals::Window->GetSize().y - text_length.y * 1.125, 1, 24);
+    J2D::End();
+}
+
+
+DemoGameSplash::~DemoGameSplash() {
+    delete RedactedSoftware;
+}
+
+