Add asset loading support.

tools/CMakeLists.txt

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+# Copyright (c) 2023 Dominic Msters
+# 
+# This software is released under the MIT License.
+# https://opensource.org/licenses/MIT
+
+# Tool Level Values
+set(
+  DAWN_TOOL_GENERATED_DEPENDENCIES
+  CACHE INTERNAL ${DAWN_CACHE_TARGET}
+)
+
+# Tools
+add_subdirectory(assetstool)
+add_subdirectory(copytool)

tools/assetstool/CMakeLists.txt

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+# Copyright (c) 2023 Dominic Masters
+# 
+# This software is released under the MIT License.
+# https://opensource.org/licenses/MIT
+
+find_package(Python3 REQUIRED COMPONENTS Interpreter)
+
+add_custom_target(dawnassets
+  COMMAND
+    ${Python3_EXECUTABLE}
+    ${DAWN_TOOLS_DIR}/assetstool/assetstool.py
+    --input=${DAWN_ASSETS_BUILD_DIR}
+    --output=${DAWN_BUILD_DIR}/dawn.tar
+  COMMENT "Bundling assets..."
+    USES_TERMINAL
+    DEPENDS ${DAWN_ASSETS}
+)

tools/assetstool/assetstool.py

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+#!/usr/bin/env python
+# Copyright (c) 2023 Dominic Masters
+# 
+# This software is released under the MIT License.
+# https://opensource.org/licenses/MIT
+
+import os
+import tarfile
+import argparse
+
+# Args
+parser = argparse.ArgumentParser(
+  description='Bundles all assets into the internal archive format.'
+)
+parser.add_argument('-i', '--input');
+parser.add_argument('-o', '--output');
+args = parser.parse_args()
+
+# Ensure the directory for the output path exists
+if not os.path.exists(os.path.dirname(args.output)):
+  os.makedirs(os.path.dirname(args.output))
+
+# Create a ZIP archive and add the specified directory
+# archive = tarfile.open(args.output, 'w:bz2') # BZ2 Compression
+
+# Does the archive already exist?
+filesInArchive = []
+
+if os.path.exists(args.output):
+  # Yes, open it
+  archive = tarfile.open(args.output, 'r:')
+
+  # Get all the files in the archive
+  for member in archive.getmembers():
+    filesInArchive.append(member.name)
+
+  archive.close()
+
+  # Open archive for appending.
+  archive = tarfile.open(args.output, 'a:')
+else:
+  # No, create it
+  archive = tarfile.open(args.output, 'w:')
+
+# Add all files in the input directory
+for foldername, subfolders, filenames in os.walk(args.input):
+  for filename in filenames:
+
+    # Is the file already in the archive?
+    absolute_path = os.path.join(foldername, filename)
+    relative_path = os.path.relpath(absolute_path, args.input)
+
+    if relative_path in filesInArchive:
+      # Yes, skip it
+      continue
+
+    # No, add it
+    print(f"Archiving asset {filename}...")
+    archive.add(absolute_path, arcname=relative_path)
+
+# Close the archive
+archive.close()

tools/copytool/CMakeLists.txt

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+# Copyright (c) 2023 Dominic Msters
+# 
+# This software is released under the MIT License.
+# https://opensource.org/licenses/MIT
+
+function(tool_copy target input output)
+  add_custom_target(${target}
+    COMMAND ${CMAKE_COMMAND} -E copy ${input} ${output}
+  )
+  add_dependencies(dawnassets ${target})
+endfunction()