Patch VST3 SDK base to allow winelib compilation

tools/patch-vst3-sdk.sh

@@ -0,0 +1,52 @@
+#!/usr/bin/env bash
+#
+# Patch the VST3 SDK and replace all MSVC-isms so it can be compiled with
+# winegcc. We do it this way instead of modifying the SDK directly so we don't
+# have to fork multiple repositories and keep them up to date.
+# If anyone knows a better way to get the SDK to compile with Win32 supports
+# under winegcc without having to modify it then please let me know, because I'd
+# rather not have to do this.
+#
+# Usage:
+# patch-vst3-sdk.sh <sdk_directory>
+
+set -euo pipefail
+
+sdk_directory=$1
+if [[ -z $sdk_directory ]]; then
+  echo "Usage:"
+  echo "patch-vst3-sdk.sh <sdk_directory>"
+  exit 1
+fi
+
+# Make sure all imports use the correct casing
+find "$sdk_directory" -type f \( -iname '*.h' -or -iname '*.cpp' \) -print0 |
+  xargs -0 sed -i 's/^#include <Windows.h>$/#include <windows.h>/'
+
+# Use the string manipulation functions from the C standard library
+sed -i 's/\bSMTG_OS_WINDOWS\b/0/g;s/\bSMTG_OS_LINUX\b/1/g' "$sdk_directory/base/source/fstring.cpp"
+sed -i 's/\bSMTG_OS_WINDOWS\b/0/g;s/\bSMTG_OS_LINUX\b/1/g' "$sdk_directory/pluginterfaces/base/fstrdefs.h"
+
+# We'll need some careful replacements in the Linux definitions in `fstring.cpp`
+# to use `wchar_t` instead of `char16_t`.
+sed -i "s/^using ConverterFacet = std::codecvt_utf8_utf16<char16_t>;$/#ifdef __WINE__\\
+    using ConverterFacet = std::codecvt_utf8_utf16<wchar_t>;\\
+#else\\
+    \0\\
+#endif/" "$sdk_directory/base/source/fstring.cpp"
+sed -i "s/^using Converter = std::wstring_convert<ConverterFacet, char16_t>;$/#ifdef __WINE__\\
+    using Converter = std::wstring_convert<ConverterFacet, wchar_t>;\\
+#else\\
+    \0\\
+#endif/" "$sdk_directory/base/source/fstring.cpp"
+
+# `Windows.h` expects `wchar_t`, and the above defines will cause us to use
+# `char16_t` for string literals. This replacement targets a very specific line,
+# so if the SDK gets updated, this fails, and we're getting a ton of `wchar_t`
+# related compile errors, that's why. The previous sed call will have replaced
+# `SMTG_OS_WINDOWS` with a 0 here.
+sed -i 's/^	#if 0$/	#if __WINE__/' "$sdk_directory/pluginterfaces/base/fstrdefs.h"
+
+# Meson requires this program to output something, or else it will error out
+# when trying to encode the empty output
+echo "Successfully patched '$sdk_directory' for winegcc compatibility"