diff --git a/.dockerignore b/.dockerignore
new file mode 100644
index 00000000..d2160131
--- /dev/null
+++ b/.dockerignore
@@ -0,0 +1,50 @@
+# .dockerignore — Exclude files from the Docker build context.
+# Keeps the context small and prevents leaking build artifacts or secrets.
+
+# Build outputs
+build/
+cache/
+
+# Git history
+.git/
+.gitignore
+.github/
+
+# Large external directories (fetched at build time inside the container)
+extern/FidelityFX-FSR2/
+extern/FidelityFX-SDK/
+
+# IDE / editor files
+.vscode/
+.idea/
+*.swp
+*.swo
+*~
+.DS_Store
+
+# Documentation (not needed for build)
+docs/
+*.md
+!container/*.md
+
+# Test / tool outputs
+logs/
+
+# Host build scripts that run outside the container (not needed inside)
+build.sh
+build.bat
+build.ps1
+rebuild.sh
+rebuild.bat
+rebuild.ps1
+clean.sh
+debug_texture.*
+extract_assets.*
+extract_warden_rsa.py
+restart-worldserver.sh
+test.sh
+
+# macOS SDK tarballs that may be temporarily placed here
+*.tar.xz
+*.tar.gz
+*.tar.bz2
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 5489cbe3..c13547b1 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -248,28 +248,98 @@ endif()
 find_package(SDL2 REQUIRED)
 find_package(Vulkan QUIET)
 if(NOT Vulkan_FOUND)
-    # Fallback: some distros / CMake versions need pkg-config to locate Vulkan.
-    find_package(PkgConfig QUIET)
-    if(PkgConfig_FOUND)
-        pkg_check_modules(VULKAN_PKG vulkan)
-        if(VULKAN_PKG_FOUND)
-            add_library(Vulkan::Vulkan INTERFACE IMPORTED)
-            set_target_properties(Vulkan::Vulkan PROPERTIES
-                INTERFACE_INCLUDE_DIRECTORIES "${VULKAN_PKG_INCLUDE_DIRS}"
-                INTERFACE_LINK_LIBRARIES "${VULKAN_PKG_LIBRARIES}"
-            )
-            if(VULKAN_PKG_LIBRARY_DIRS)
+    # For Windows cross-compilation the host pkg-config finds the Linux libvulkan-dev
+    # and injects /usr/include as an INTERFACE_INCLUDE_DIRECTORY, which causes
+    # MinGW clang to pull in glibc headers (bits/libc-header-start.h) instead of
+    # the MinGW sysroot headers.  Skip the host pkg-config path entirely and instead
+    # locate Vulkan via vcpkg-installed vulkan-headers or the MinGW toolchain.
+    if(CMAKE_CROSSCOMPILING AND WIN32)
+        # The cross-compile build script generates a Vulkan import library
+        # (libvulkan-1.a) in ${CMAKE_BINARY_DIR}/vulkan-import from the headers.
+        set(_VULKAN_IMPORT_DIR "${CMAKE_BINARY_DIR}/vulkan-import")
+
+        find_package(VulkanHeaders CONFIG QUIET)
+        if(VulkanHeaders_FOUND)
+            if(NOT TARGET Vulkan::Vulkan)
+                add_library(Vulkan::Vulkan INTERFACE IMPORTED)
+            endif()
+            # Vulkan::Headers is provided by vcpkg's vulkan-headers port and carries
+            # the correct MinGW include path — no Linux system headers involved.
+            set_property(TARGET Vulkan::Vulkan APPEND PROPERTY
+                INTERFACE_LINK_LIBRARIES Vulkan::Headers)
+            # Link against the Vulkan loader import library (vulkan-1.dll).
+            if(EXISTS "${_VULKAN_IMPORT_DIR}/libvulkan-1.a")
                 set_property(TARGET Vulkan::Vulkan APPEND PROPERTY
-                    INTERFACE_LINK_DIRECTORIES "${VULKAN_PKG_LIBRARY_DIRS}")
+                    INTERFACE_LINK_DIRECTORIES "${_VULKAN_IMPORT_DIR}")
+                set_property(TARGET Vulkan::Vulkan APPEND PROPERTY
+                    INTERFACE_LINK_LIBRARIES vulkan-1)
             endif()
             set(Vulkan_FOUND TRUE)
-            message(STATUS "Found Vulkan via pkg-config: ${VULKAN_PKG_LIBRARIES}")
+            message(STATUS "Found Vulkan headers for Windows cross-compile via vcpkg VulkanHeaders")
+        else()
+            # Last-resort: check the LLVM-MinGW toolchain sysroot directly.
+            find_path(_VULKAN_MINGW_INCLUDE NAMES vulkan/vulkan.h
+                PATHS /opt/llvm-mingw/x86_64-w64-mingw32/include NO_DEFAULT_PATH)
+            if(_VULKAN_MINGW_INCLUDE)
+                if(NOT TARGET Vulkan::Vulkan)
+                    add_library(Vulkan::Vulkan INTERFACE IMPORTED)
+                endif()
+                set_target_properties(Vulkan::Vulkan PROPERTIES
+                    INTERFACE_INCLUDE_DIRECTORIES "${_VULKAN_MINGW_INCLUDE}")
+                # Link against the Vulkan loader import library (vulkan-1.dll).
+                if(EXISTS "${_VULKAN_IMPORT_DIR}/libvulkan-1.a")
+                    set_property(TARGET Vulkan::Vulkan APPEND PROPERTY
+                        INTERFACE_LINK_DIRECTORIES "${_VULKAN_IMPORT_DIR}")
+                    set_property(TARGET Vulkan::Vulkan APPEND PROPERTY
+                        INTERFACE_LINK_LIBRARIES vulkan-1)
+                endif()
+                set(Vulkan_FOUND TRUE)
+                message(STATUS "Found Vulkan headers in LLVM-MinGW sysroot: ${_VULKAN_MINGW_INCLUDE}")
+            endif()
+        endif()
+    elseif(CMAKE_CROSSCOMPILING AND CMAKE_SYSTEM_NAME STREQUAL "Darwin")
+        # macOS cross-compilation: use vcpkg-installed vulkan-headers.
+        # The host pkg-config would find Linux libvulkan-dev headers which the
+        # macOS cross-compiler cannot use (different sysroot).
+        find_package(VulkanHeaders CONFIG QUIET)
+        if(VulkanHeaders_FOUND)
+            if(NOT TARGET Vulkan::Vulkan)
+                add_library(Vulkan::Vulkan INTERFACE IMPORTED)
+            endif()
+            set_property(TARGET Vulkan::Vulkan APPEND PROPERTY
+                INTERFACE_LINK_LIBRARIES Vulkan::Headers)
+            set(Vulkan_FOUND TRUE)
+            message(STATUS "Found Vulkan headers for macOS cross-compile via vcpkg VulkanHeaders")
+        endif()
+    else()
+        # Fallback: some distros / CMake versions need pkg-config to locate Vulkan.
+        find_package(PkgConfig QUIET)
+        if(PkgConfig_FOUND)
+            pkg_check_modules(VULKAN_PKG vulkan)
+            if(VULKAN_PKG_FOUND)
+                add_library(Vulkan::Vulkan INTERFACE IMPORTED)
+                set_target_properties(Vulkan::Vulkan PROPERTIES
+                    INTERFACE_INCLUDE_DIRECTORIES "${VULKAN_PKG_INCLUDE_DIRS}"
+                    INTERFACE_LINK_LIBRARIES "${VULKAN_PKG_LIBRARIES}"
+                )
+                if(VULKAN_PKG_LIBRARY_DIRS)
+                    set_property(TARGET Vulkan::Vulkan APPEND PROPERTY
+                        INTERFACE_LINK_DIRECTORIES "${VULKAN_PKG_LIBRARY_DIRS}")
+                endif()
+                set(Vulkan_FOUND TRUE)
+                message(STATUS "Found Vulkan via pkg-config: ${VULKAN_PKG_LIBRARIES}")
+            endif()
         endif()
     endif()
     if(NOT Vulkan_FOUND)
         message(FATAL_ERROR "Could not find Vulkan. Install libvulkan-dev (Linux), vulkan-loader (macOS), or the Vulkan SDK (Windows).")
     endif()
 endif()
+# macOS cross-compilation: the Vulkan loader (MoltenVK) is not available at link
+# time. Allow unresolved Vulkan symbols — they are resolved at runtime.
+if(CMAKE_CROSSCOMPILING AND CMAKE_SYSTEM_NAME STREQUAL "Darwin")
+    add_link_options("-undefined" "dynamic_lookup")
+endif()
 # GL/GLEW kept temporarily for unconverted sub-renderers during Vulkan migration.
 # These files compile against GL types but their code is never called — the Vulkan
 # path is the only active rendering backend. Remove in Phase 7 when all renderers
@@ -674,12 +744,16 @@ set(WOWEE_HEADERS
 
 set(WOWEE_PLATFORM_SOURCES)
 if(WIN32)
-    # Copy icon into build tree so llvm-rc can find it via the relative path in wowee.rc
+    # Copy icon into build tree so windres can find it via the relative path
+    # in wowee.rc ("assets\\wowee.ico").  Tell the RC compiler to also search
+    # the build directory — GNU windres uses cwd (already the build dir) but
+    # llvm-windres resolves relative to the .rc file, so it needs the hint.
     configure_file(
         ${CMAKE_CURRENT_SOURCE_DIR}/assets/Wowee.ico
         ${CMAKE_CURRENT_BINARY_DIR}/assets/wowee.ico
         COPYONLY
     )
+    set(CMAKE_RC_FLAGS "${CMAKE_RC_FLAGS} -I ${CMAKE_CURRENT_BINARY_DIR} -I ${CMAKE_CURRENT_SOURCE_DIR}")
     list(APPEND WOWEE_PLATFORM_SOURCES resources/wowee.rc)
 endif()
 
diff --git a/container/FLOW.md b/container/FLOW.md
new file mode 100644
index 00000000..619328c0
--- /dev/null
+++ b/container/FLOW.md
@@ -0,0 +1,283 @@
+# Container Build Flow
+
+Comprehensive documentation of the Docker-based build pipeline for each target platform.
+
+---
+
+## Architecture Overview
+
+Each platform follows the same two-phase pattern:
+
+1. **Image Build** (one-time, cached by Docker) — installs compilers, toolchains, and pre-builds vcpkg dependencies.
+2. **Container Run** (each build) — copies source into the container, runs CMake configure + build, outputs artifacts to the host.
+
+```
+Host                              Docker
+─────────────────────────────────────────────────────────────
+run-{platform}.sh/.ps1
+  │
+  ├─ docker build                 builder-{platform}.Dockerfile
+  │    (cached after first run)     ├─ install compilers
+  │                                 ├─ install vcpkg + packages
+  │                                 └─ COPY build-{platform}.sh
+  │
+  └─ docker run                   build-{platform}.sh (entrypoint)
+       ├─ bind /src (readonly)      ├─ tar copy source → /wowee-build-src
+       └─ bind /out (writable)      ├─ git clone FidelityFX SDKs
+                                    ├─ cmake -S . -B /out
+                                    ├─ cmake --build /out
+                                    └─ artifacts appear in /out
+```
+
+---
+
+## Linux Build Flow
+
+**Image:** `wowee-builder-linux`  
+**Dockerfile:** `builder-linux.Dockerfile`  
+**Toolchain:** GCC + Ninja (native amd64)  
+**Base:** Ubuntu 24.04
+
+### Docker Image Build Steps
+
+| Step | What | Why |
+|------|------|-----|
+| 1 | `apt-get install` cmake, ninja-build, build-essential, pkg-config, git, python3 | Core build tools |
+| 2 | `apt-get install` glslang-tools, spirv-tools | Vulkan shader compilation |
+| 3 | `apt-get install` libsdl2-dev, libglew-dev, libglm-dev, libssl-dev, zlib1g-dev | Runtime dependencies (system packages) |
+| 4 | `apt-get install` libavformat-dev, libavcodec-dev, libswscale-dev, libavutil-dev | FFmpeg libraries |
+| 5 | `apt-get install` libvulkan-dev, vulkan-tools | Vulkan SDK |
+| 6 | `apt-get install` libstorm-dev, libunicorn-dev | MPQ archive + CPU emulation |
+| 7 | COPY `build-linux.sh` → `/build-platform.sh` | Container entrypoint |
+
+### Container Run Steps (build-linux.sh)
+
+```
+1. tar copy /src → /wowee-build-src (excludes build/, .git/, large Data/ dirs)
+2. git clone FidelityFX-FSR2 (if missing)
+3. git clone FidelityFX-SDK (if missing)
+4. cmake configure:
+     -G Ninja
+     -DCMAKE_BUILD_TYPE=Release
+     -DCMAKE_C_COMPILER=gcc
+     -DCMAKE_CXX_COMPILER=g++
+     -DCMAKE_INTERPROCEDURAL_OPTIMIZATION=ON
+5. cmake --build (parallel)
+6. Create Data symlink: build/linux/bin/Data → ../../../Data
+```
+
+### Output
+- `build/linux/bin/wowee` — ELF 64-bit x86-64 executable
+- `build/linux/bin/Data` — symlink to project Data/ directory
+
+---
+
+## macOS Build Flow
+
+**Image:** `wowee-builder-macos`  
+**Dockerfile:** `builder-macos.Dockerfile` (multi-stage)  
+**Toolchain:** osxcross (Clang 18 + Apple ld64)  
+**Base:** Ubuntu 24.04  
+**Targets:** arm64-apple-darwin24.5 (default), x86_64-apple-darwin24.5
+
+### Docker Image Build — Stage 1: SDK Fetcher
+
+The macOS SDK is fetched automatically from Apple's public software update catalog.
+No manual download required.
+
+| Step | What | Why |
+|------|------|-----|
+| 1 | `FROM ubuntu:24.04 AS sdk-fetcher` | Lightweight stage for SDK download |
+| 2 | `apt-get install` ca-certificates, python3, cpio, tar, gzip, xz-utils | SDK extraction tools |
+| 3 | COPY `macos/sdk-fetcher.py` → `/opt/sdk-fetcher.py` | Python script that scrapes Apple's SUCATALOG |
+| 4 | `python3 /opt/sdk-fetcher.py /opt/sdk` | Downloads, extracts, and packages MacOSX15.5.sdk.tar.gz |
+
+**SDK Fetcher internals** (`macos/sdk-fetcher.py`):
+1. Queries Apple SUCATALOG URLs for the latest macOS package
+2. Downloads the `CLTools_macOSNMOS_SDK.pkg` package
+3. Extracts the XAR archive (using `bsdtar` or pure-Python fallback)
+4. Decompresses the PBZX payload stream
+5. Extracts via `cpio` to get the SDK directory
+6. Packages as `MacOSX<version>.sdk.tar.gz`
+
+### Docker Image Build — Stage 2: Builder
+
+| Step | What | Why |
+|------|------|-----|
+| 1 | `FROM ubuntu:24.04 AS builder` | Full build environment |
+| 2 | `apt-get install` cmake, ninja-build, git, python3, curl, wget, xz-utils, zip, unzip, tar, make, patch, libssl-dev, zlib1g-dev, pkg-config, libbz2-dev, libxml2-dev, uuid-dev | Build tools + osxcross build deps |
+| 3 | Install Clang 18 from LLVM apt repo (`llvm-toolchain-jammy-18`) | Cross-compiler backend |
+| 4 | Symlink clang-18 → clang, clang++-18 → clang++, etc. | osxcross expects unversioned names |
+| 5 | `git clone osxcross` → `/opt/osxcross` | Apple cross-compile toolchain wrapper |
+| 6 | `COPY --from=sdk-fetcher /opt/sdk/ → /opt/osxcross/tarballs/` | SDK from stage 1 |
+| 7 | `UNATTENDED=1 ./build.sh` | Builds osxcross (LLVM wrappers + cctools + ld64) |
+| 8 | Create unprefixed symlinks (install_name_tool, otool, lipo, codesign) | vcpkg/CMake need these without arch prefix |
+| 9 | COPY `macos/osxcross-toolchain.cmake` → `/opt/osxcross-toolchain.cmake` | Auto-detecting CMake toolchain |
+| 10 | COPY `macos/triplets/` → `/opt/vcpkg-triplets/` | vcpkg cross-compile triplet definitions |
+| 11 | `apt-get install` file, nasm | Mach-O detection + ffmpeg x86 asm |
+| 12 | Bootstrap vcpkg → `/opt/vcpkg` | Package manager |
+| 13 | `vcpkg install` sdl2, openssl, glew, glm, zlib, ffmpeg `--triplet arm64-osx-cross` | arm64 dependencies |
+| 14 | `vcpkg install` same packages `--triplet x64-osx-cross` | x86_64 dependencies |
+| 15 | `apt-get install` libvulkan-dev, glslang-tools | Vulkan headers (for compilation, not runtime) |
+| 16 | COPY `build-macos.sh` → `/build-platform.sh` | Container entrypoint |
+
+### Custom Toolchain Files
+
+**`macos/osxcross-toolchain.cmake`** — Auto-detecting CMake toolchain:
+- Detects SDK path via `file(GLOB)` in `/opt/osxcross/target/SDK/MacOSX*.sdk`
+- Detects darwin version from compiler binary names (e.g., `arm64-apple-darwin24.5-clang`)
+- Picks architecture from `CMAKE_OSX_ARCHITECTURES`
+- Sets `CMAKE_C_COMPILER`, `CMAKE_CXX_COMPILER`, `CMAKE_AR`, `CMAKE_RANLIB`, `CMAKE_STRIP`
+
+**`macos/triplets/arm64-osx-cross.cmake`**:
+```cmake
+set(VCPKG_TARGET_ARCHITECTURE arm64)
+set(VCPKG_LIBRARY_LINKAGE static)
+set(VCPKG_CMAKE_SYSTEM_NAME Darwin)
+set(VCPKG_CHAINLOAD_TOOLCHAIN_FILE /opt/osxcross-toolchain.cmake)
+```
+
+### Container Run Steps (build-macos.sh)
+
+```
+1. Determine arch from MACOS_ARCH env (default: arm64)
+2. Pick vcpkg triplet: arm64-osx-cross or x64-osx-cross
+3. Auto-detect darwin target from osxcross binaries
+4. tar copy /src → /wowee-build-src
+5. git clone FidelityFX-FSR2 + FidelityFX-SDK (if missing)
+6. cmake configure:
+     -G Ninja
+     -DCMAKE_BUILD_TYPE=Release
+     -DCMAKE_SYSTEM_NAME=Darwin
+     -DCMAKE_OSX_ARCHITECTURES=${ARCH}
+     -DCMAKE_C_COMPILER=osxcross clang
+     -DCMAKE_CXX_COMPILER=osxcross clang++
+     -DCMAKE_TOOLCHAIN_FILE=vcpkg.cmake
+     -DVCPKG_TARGET_TRIPLET=arm64-osx-cross
+     -DVCPKG_OVERLAY_TRIPLETS=/opt/vcpkg-triplets
+7. cmake --build (parallel)
+```
+
+### CMakeLists.txt Integration
+
+The main CMakeLists.txt has a macOS cross-compile branch that:
+- Finds Vulkan headers via vcpkg (`VulkanHeaders` package) instead of the Vulkan SDK
+- Adds `-undefined dynamic_lookup` linker flag for Vulkan loader symbols (resolved at runtime via MoltenVK)
+
+### Output
+- `build/macos/bin/wowee` — Mach-O 64-bit arm64 (or x86_64) executable (~40 MB)
+
+---
+
+## Windows Build Flow
+
+**Image:** `wowee-builder-windows`  
+**Dockerfile:** `builder-windows.Dockerfile`  
+**Toolchain:** LLVM-MinGW (Clang + LLD) targeting x86_64-w64-mingw32-ucrt  
+**Base:** Ubuntu 24.04
+
+### Docker Image Build Steps
+
+| Step | What | Why |
+|------|------|-----|
+| 1 | `apt-get install` ca-certificates, build-essential, cmake, ninja-build, git, python3, curl, zip, unzip, tar, xz-utils, pkg-config, nasm, libssl-dev, zlib1g-dev | Build tools |
+| 2 | Download + extract LLVM-MinGW (v20240619 ucrt) → `/opt/llvm-mingw` | Clang/LLD cross-compiler for Windows |
+| 3 | Add `/opt/llvm-mingw/bin` to PATH | Makes `x86_64-w64-mingw32-clang` etc. available |
+| 4 | Bootstrap vcpkg → `/opt/vcpkg` | Package manager |
+| 5 | `vcpkg install` sdl2, openssl, glew, glm, zlib, ffmpeg `--triplet x64-mingw-static` | Static Windows dependencies |
+| 6 | `apt-get install` libvulkan-dev, glslang-tools | Vulkan headers + shader tools |
+| 7 | Create no-op `powershell.exe` stub | vcpkg MinGW post-build hook needs it |
+| 8 | COPY `build-windows.sh` → `/build-platform.sh` | Container entrypoint |
+
+### Container Run Steps (build-windows.sh)
+
+```
+1. Set up no-op powershell.exe (if not already present)
+2. tar copy /src → /wowee-build-src
+3. git clone FidelityFX-FSR2 + FidelityFX-SDK (if missing)
+4. Generate Vulkan import library:
+     a. Extract vk* symbols from vulkan_core.h
+     b. Create vulkan-1.def file
+     c. Run dlltool to create libvulkan-1.a
+5. Lock PKG_CONFIG_LIBDIR to vcpkg packages only
+6. cmake configure:
+     -G Ninja
+     -DCMAKE_BUILD_TYPE=Release
+     -DCMAKE_SYSTEM_NAME=Windows
+     -DCMAKE_C_COMPILER=x86_64-w64-mingw32-clang
+     -DCMAKE_CXX_COMPILER=x86_64-w64-mingw32-clang++
+     -DCMAKE_RC_COMPILER=x86_64-w64-mingw32-windres
+     -DCMAKE_EXE_LINKER_FLAGS=-fuse-ld=lld
+     -DCMAKE_TOOLCHAIN_FILE=vcpkg.cmake
+     -DVCPKG_TARGET_TRIPLET=x64-mingw-static
+     -DVCPKG_APPLOCAL_DEPS=OFF
+7. cmake --build (parallel)
+```
+
+### Vulkan Import Library Generation
+
+Windows applications link against `vulkan-1.dll` (the Khronos Vulkan loader). Since the LLVM-MinGW toolchain doesn't ship a Vulkan import library, the build script generates one:
+
+1. Parses `vulkan_core.h` for `VKAPI_CALL vk*` function names
+2. Creates a `.def` file mapping symbols to `vulkan-1.dll`
+3. Uses `dlltool` to produce `libvulkan-1.a` (PE import library)
+
+This allows the linker to resolve Vulkan symbols at build time, while deferring actual loading to the runtime DLL.
+
+### Output
+- `build/windows/bin/wowee.exe` — PE32+ x86-64 executable (~135 MB)
+
+---
+
+## Shared Patterns
+
+### Source Tree Copy
+
+All three platforms use the same tar-based copy with exclusions:
+```bash
+tar -C /src \
+    --exclude='./build' --exclude='./logs' --exclude='./cache' \
+    --exclude='./container' --exclude='./.git' \
+    --exclude='./Data/character' --exclude='./Data/creature' \
+    --exclude='./Data/db' --exclude='./Data/environment' \
+    --exclude='./Data/interface' --exclude='./Data/item' \
+    --exclude='./Data/misc' --exclude='./Data/sound' \
+    --exclude='./Data/spell' --exclude='./Data/terrain' \
+    --exclude='./Data/world' \
+    -cf - . | tar -C /wowee-build-src -xf -
+```
+
+**Kept:** `Data/opcodes/`, `Data/expansions/` (small, needed at build time for configuration).  
+**Excluded:** Large game asset directories (character, creature, environment, etc.) not needed for compilation.
+
+### FidelityFX SDK Fetch
+
+All platforms clone the same two repos at build time:
+1. **FidelityFX-FSR2** — FSR 2.0 upscaling
+2. **FidelityFX-SDK** — FSR 3.0 frame generation (repo URL/ref configurable via env vars)
+
+### .dockerignore
+
+The `.dockerignore` at the project root minimizes the Docker build context by excluding:
+- `build/`, `cache/`, `logs/`, `.git/`
+- Large external dirs (`extern/FidelityFX-*`)
+- IDE files, documentation, host-only scripts
+- SDK tarballs (`*.tar.xz`, `*.tar.gz`, etc.)
+
+---
+
+## Timing Estimates
+
+These are approximate times on a 4-core machine with 16 GB RAM:
+
+| Phase | Linux | macOS | Windows |
+|-------|-------|-------|---------|
+| Docker image build (first time) | ~5 min | ~25 min | ~15 min |
+| Docker image build (cached) | seconds | seconds | seconds |
+| Source copy + SDK fetch | ~10 sec | ~10 sec | ~10 sec |
+| CMake configure | ~20 sec | ~30 sec | ~30 sec |
+| Compilation | ~8 min | ~8 min | ~8 min |
+| **Total (first build)** | **~14 min** | **~34 min** | **~24 min** |
+| **Total (subsequent)** | **~9 min** | **~9 min** | **~9 min** |
+
+macOS image is slowest because osxcross builds a subset of LLVM + cctools, and vcpkg packages are compiled for two architectures (arm64 + x64).
diff --git a/container/README.md b/container/README.md
new file mode 100644
index 00000000..da911f2c
--- /dev/null
+++ b/container/README.md
@@ -0,0 +1,119 @@
+# Container Builds
+
+Build WoWee for **Linux**, **macOS**, or **Windows** with a single command.  
+All builds run inside Docker — no toolchains to install on your host.
+
+## Prerequisites
+
+- [Docker](https://docs.docker.com/get-docker/) (Docker Desktop on Windows/macOS, or Docker Engine on Linux)
+- ~20 GB free disk space (toolchains + vcpkg packages are cached in the Docker image)
+
+## Quick Start
+
+Run **from the project root directory**.
+
+### Linux (native amd64)
+
+```bash
+# Bash / Linux / macOS terminal
+./container/run-linux.sh
+```
+```powershell
+# PowerShell (Windows)
+.\container\run-linux.ps1
+```
+
+Output: `build/linux/bin/wowee`
+
+### macOS (cross-compile, arm64 default)
+
+```bash
+./container/run-macos.sh
+```
+```powershell
+.\container\run-macos.ps1
+```
+
+Output: `build/macos/bin/wowee`
+
+For Intel (x86_64):
+```bash
+MACOS_ARCH=x86_64 ./container/run-macos.sh
+```
+```powershell
+.\container\run-macos.ps1 -Arch x86_64
+```
+
+### Windows (cross-compile, x86_64)
+
+```bash
+./container/run-windows.sh
+```
+```powershell
+.\container\run-windows.ps1
+```
+
+Output: `build/windows/bin/wowee.exe`
+
+## Options
+
+| Option | Bash | PowerShell | Description |
+|--------|------|------------|-------------|
+| Rebuild image | `--rebuild-image` | `-RebuildImage` | Force a fresh Docker image build |
+| macOS arch | `MACOS_ARCH=x86_64` | `-Arch x86_64` | Build for Intel instead of Apple Silicon |
+| FidelityFX SDK repo | `WOWEE_FFX_SDK_REPO=<url>` | `$env:WOWEE_FFX_SDK_REPO="<url>"` | Custom FidelityFX SDK git URL |
+| FidelityFX SDK ref | `WOWEE_FFX_SDK_REF=<ref>` | `$env:WOWEE_FFX_SDK_REF="<ref>"` | Custom FidelityFX SDK git ref/tag |
+
+## Docker Image Caching
+
+The first build takes longer because Docker builds the toolchain image (installing compilers, vcpkg packages, etc.). Subsequent builds reuse the cached image and only run the compilation step.
+
+To force a full image rebuild:
+```bash
+./container/run-linux.sh --rebuild-image
+```
+
+## Output Locations
+
+| Target | Binary | Size |
+|--------|--------|------|
+| Linux | `build/linux/bin/wowee` | ~135 MB |
+| macOS | `build/macos/bin/wowee` | ~40 MB |
+| Windows | `build/windows/bin/wowee.exe` | ~135 MB |
+
+## File Structure
+
+```
+container/
+├── run-linux.sh / .ps1          # Host launchers (bash / PowerShell)
+├── run-macos.sh / .ps1
+├── run-windows.sh / .ps1
+├── build-linux.sh               # Container entrypoints (run inside Docker)
+├── build-macos.sh
+├── build-windows.sh
+├── builder-linux.Dockerfile     # Docker image definitions
+├── builder-macos.Dockerfile
+├── builder-windows.Dockerfile
+├── macos/
+│   ├── sdk-fetcher.py           # Auto-fetches macOS SDK from Apple's catalog
+│   ├── osxcross-toolchain.cmake # CMake toolchain for osxcross
+│   └── triplets/                # vcpkg cross-compile triplets
+│       ├── arm64-osx-cross.cmake
+│       └── x64-osx-cross.cmake
+├── README.md                    # This file
+└── FLOW.md                      # Detailed build flow documentation
+```
+
+## Troubleshooting
+
+**"docker is not installed or not in PATH"**  
+Install Docker and ensure the `docker` command is available in your terminal.
+
+**Build fails on first run**  
+Some vcpkg packages (ffmpeg, SDL2) take a while to compile. Ensure you have enough RAM (4 GB+) and disk space.
+
+**macOS build: "could not find osxcross compiler"**  
+The Docker image may not have built correctly. Run with `--rebuild-image` to rebuild from scratch.
+
+**Windows build: linker errors about vulkan-1.dll**  
+The build script auto-generates a Vulkan import library. If this fails, ensure the Docker image has `libvulkan-dev` installed (it should, by default).
diff --git a/container/build-in-container.sh b/container/build-in-container.sh
deleted file mode 100755
index cc0822b4..00000000
--- a/container/build-in-container.sh
+++ /dev/null
@@ -1,19 +0,0 @@
-#!/bin/bash
-
-set -eu 
-set -o pipefail
-
-SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
-PROJECT_ROOT="$(cd "${SCRIPT_DIR}/.." && pwd)"
-
-podman build \
-	-f "${SCRIPT_DIR}/builder-ubuntu.Dockerfile" \
-	-t wowee-builder-ubuntu
-
-BUILD_DIR="$(mktemp --tmpdir -d wowee.XXXXX \
-	--suffix=".$(cd "${PROJECT_ROOT}"; git rev-parse --short HEAD)")"
-podman run \
-	--mount "type=bind,src=${PROJECT_ROOT},dst=/WoWee-src,ro=true" \
-	--mount "type=bind,src=${BUILD_DIR},dst=/build" \
-	localhost/wowee-builder-ubuntu \
-	./build-wowee.sh
diff --git a/container/build-linux.sh b/container/build-linux.sh
new file mode 100755
index 00000000..e16cae11
--- /dev/null
+++ b/container/build-linux.sh
@@ -0,0 +1,62 @@
+#!/bin/bash
+# Linux amd64 build entrypoint — runs INSIDE the linux container.
+# Bind-mounts:
+#   /src  (ro) — project source
+#   /out  (rw) — host ./build/linux
+
+set -euo pipefail
+
+SRC=/src
+OUT=/out
+NPROC=$(nproc)
+
+echo "==> [linux] Copying source tree..."
+tar -C "${SRC}" \
+    --exclude='./build' --exclude='./logs' --exclude='./cache' \
+    --exclude='./container' --exclude='./.git' \
+    --exclude='./Data/character' --exclude='./Data/creature' \
+    --exclude='./Data/db' --exclude='./Data/environment' \
+    --exclude='./Data/interface' --exclude='./Data/item' \
+    --exclude='./Data/misc' --exclude='./Data/sound' \
+    --exclude='./Data/spell' --exclude='./Data/terrain' \
+    --exclude='./Data/world' \
+    -cf - . | tar -C /wowee-build-src -xf -
+
+cd /wowee-build-src
+
+echo "==> [linux] Fetching external SDKs (if needed)..."
+if [ ! -f extern/FidelityFX-FSR2/src/ffx-fsr2-api/ffx_fsr2.h ]; then
+    git clone --depth 1 \
+        https://github.com/GPUOpen-Effects/FidelityFX-FSR2.git \
+        extern/FidelityFX-FSR2 || echo "Warning: FSR2 clone failed — continuing without FSR2"
+fi
+
+SDK_REPO="${WOWEE_FFX_SDK_REPO:-https://github.com/Kelsidavis/FidelityFX-SDK.git}"
+SDK_REF="${WOWEE_FFX_SDK_REF:-main}"
+if [ ! -f "extern/FidelityFX-SDK/sdk/include/FidelityFX/host/ffx_frameinterpolation.h" ]; then
+    git clone --depth 1 --branch "${SDK_REF}" "${SDK_REPO}" extern/FidelityFX-SDK \
+        || echo "Warning: FidelityFX-SDK clone failed — continuing without FSR3"
+fi
+
+echo "==> [linux] Configuring with CMake (Release, Ninja, amd64)..."
+cmake -S . -B "${OUT}" \
+    -G Ninja \
+    -DCMAKE_BUILD_TYPE=Release \
+    -DCMAKE_C_COMPILER=gcc \
+    -DCMAKE_CXX_COMPILER=g++ \
+    -DCMAKE_INTERPROCEDURAL_OPTIMIZATION=ON
+
+echo "==> [linux] Building with ${NPROC} cores..."
+cmake --build "${OUT}" --parallel "${NPROC}"
+
+echo "==> [linux] Creating Data symlink..."
+mkdir -p "${OUT}/bin"
+if [ ! -e "${OUT}/bin/Data" ]; then
+    # Relative symlink so it resolves correctly on the host:
+    # build/linux/bin/Data -> ../../../Data (project root)
+    ln -s ../../../Data "${OUT}/bin/Data"
+fi
+
+echo ""
+echo "==> [linux] Build complete. Artifacts in: ./build/linux/"
+echo "    Binary: ./build/linux/bin/wowee"
diff --git a/container/build-macos.sh b/container/build-macos.sh
new file mode 100755
index 00000000..3ead48e1
--- /dev/null
+++ b/container/build-macos.sh
@@ -0,0 +1,83 @@
+#!/bin/bash
+# macOS cross-compile entrypoint — runs INSIDE the macos container.
+# Toolchain: osxcross + Apple Clang, target: arm64-apple-darwin (default) or
+#            x86_64-apple-darwin when MACOS_ARCH=x86_64.
+# Bind-mounts:
+#   /src  (ro) — project source
+#   /out  (rw) — host ./build/macos
+
+set -euo pipefail
+
+SRC=/src
+OUT=/out
+NPROC=$(nproc)
+
+# Arch selection: arm64 (Apple Silicon) is the default primary target.
+ARCH="${MACOS_ARCH:-arm64}"
+case "${ARCH}" in
+    arm64)   VCPKG_TRIPLET=arm64-osx-cross  ;;
+    x86_64)  VCPKG_TRIPLET=x64-osx-cross    ;;
+    *)  echo "ERROR: unsupported MACOS_ARCH '${ARCH}'. Use arm64 or x86_64." ; exit 1 ;;
+esac
+
+# Auto-detect darwin target from osxcross binaries (e.g. arm64-apple-darwin24.5).
+OSXCROSS_BIN=/opt/osxcross/target/bin
+TARGET=$(basename "$(ls "${OSXCROSS_BIN}/${ARCH}-apple-darwin"*-clang 2>/dev/null | head -1)" | sed 's/-clang$//')
+if [[ -z "${TARGET}" ]]; then
+    echo "ERROR: could not find osxcross ${ARCH} compiler in ${OSXCROSS_BIN}" >&2
+    exit 1
+fi
+echo "==> Detected osxcross target: ${TARGET}"
+
+echo "==> [macos/${ARCH}] Copying source tree..."
+mkdir -p /wowee-build-src
+tar -C "${SRC}" \
+    --exclude='./build' --exclude='./logs' --exclude='./cache' \
+    --exclude='./container' --exclude='./.git' \
+    --exclude='./Data/character' --exclude='./Data/creature' \
+    --exclude='./Data/db' --exclude='./Data/environment' \
+    --exclude='./Data/interface' --exclude='./Data/item' \
+    --exclude='./Data/misc' --exclude='./Data/sound' \
+    --exclude='./Data/spell' --exclude='./Data/terrain' \
+    --exclude='./Data/world' \
+    -cf - . | tar -C /wowee-build-src -xf -
+
+cd /wowee-build-src
+
+echo "==> [macos/${ARCH}] Fetching external SDKs (if needed)..."
+if [ ! -f extern/FidelityFX-FSR2/src/ffx-fsr2-api/ffx_fsr2.h ]; then
+    git clone --depth 1 \
+        https://github.com/GPUOpen-Effects/FidelityFX-FSR2.git \
+        extern/FidelityFX-FSR2 || echo "Warning: FSR2 clone failed"
+fi
+
+SDK_REPO="${WOWEE_FFX_SDK_REPO:-https://github.com/Kelsidavis/FidelityFX-SDK.git}"
+SDK_REF="${WOWEE_FFX_SDK_REF:-main}"
+if [ ! -f "extern/FidelityFX-SDK/sdk/include/FidelityFX/host/ffx_frameinterpolation.h" ]; then
+    git clone --depth 1 --branch "${SDK_REF}" "${SDK_REPO}" extern/FidelityFX-SDK \
+        || echo "Warning: FidelityFX-SDK clone failed"
+fi
+
+echo "==> [macos/${ARCH}] Configuring with CMake (Release, Ninja, osxcross ${TARGET})..."
+cmake -S . -B "${OUT}" \
+    -G Ninja \
+    -DCMAKE_BUILD_TYPE=Release \
+    -DCMAKE_SYSTEM_NAME=Darwin \
+    -DCMAKE_OSX_ARCHITECTURES="${ARCH}" \
+    -DCMAKE_OSX_DEPLOYMENT_TARGET="${MACOSX_DEPLOYMENT_TARGET:-13.0}" \
+    -DCMAKE_C_COMPILER="${OSXCROSS_BIN}/${TARGET}-clang" \
+    -DCMAKE_CXX_COMPILER="${OSXCROSS_BIN}/${TARGET}-clang++" \
+    -DCMAKE_AR="${OSXCROSS_BIN}/${TARGET}-ar" \
+    -DCMAKE_RANLIB="${OSXCROSS_BIN}/${TARGET}-ranlib" \
+    -DCMAKE_TOOLCHAIN_FILE="${VCPKG_ROOT}/scripts/buildsystems/vcpkg.cmake" \
+    -DVCPKG_TARGET_TRIPLET="${VCPKG_TRIPLET}" \
+    -DVCPKG_OVERLAY_TRIPLETS=/opt/vcpkg-triplets \
+    -DCMAKE_INTERPROCEDURAL_OPTIMIZATION=OFF \
+    -DWOWEE_ENABLE_ASAN=OFF
+
+echo "==> [macos/${ARCH}] Building with ${NPROC} cores..."
+cmake --build "${OUT}" --parallel "${NPROC}"
+
+echo ""
+echo "==> [macos/${ARCH}] Build complete. Artifacts in: ./build/macos/"
+echo "    Binary: ./build/macos/bin/wowee"
diff --git a/container/build-windows.sh b/container/build-windows.sh
new file mode 100755
index 00000000..7f0478ef
--- /dev/null
+++ b/container/build-windows.sh
@@ -0,0 +1,110 @@
+#!/bin/bash
+# Windows cross-compile entrypoint — runs INSIDE the windows container.
+# Toolchain: LLVM-MinGW (Clang + LLD), target: x86_64-w64-mingw32-ucrt
+# Bind-mounts:
+#   /src  (ro) — project source
+#   /out  (rw) — host ./build/windows
+
+set -euo pipefail
+
+SRC=/src
+OUT=/out
+NPROC=$(nproc)
+TARGET=x86_64-w64-mingw32
+
+# vcpkg's MinGW applocal hook always appends a powershell.exe post-build step to
+# copy DLLs next to each binary, even when VCPKG_APPLOCAL_DEPS=OFF.  For the
+# x64-mingw-static triplet the bin/ dir is empty (no DLLs) so the script does
+# nothing — but it still needs to exit 0.  Provide a no-op stub if the real
+# PowerShell isn't available.
+if ! command -v powershell.exe &>/dev/null; then
+    printf '#!/bin/sh\nexit 0\n' > /usr/local/bin/powershell.exe
+    chmod +x /usr/local/bin/powershell.exe
+fi
+
+echo "==> [windows] Copying source tree..."
+mkdir -p /wowee-build-src
+tar -C "${SRC}" \
+    --exclude='./build' --exclude='./logs' --exclude='./cache' \
+    --exclude='./container' --exclude='./.git' \
+    --exclude='./Data/character' --exclude='./Data/creature' \
+    --exclude='./Data/db' --exclude='./Data/environment' \
+    --exclude='./Data/interface' --exclude='./Data/item' \
+    --exclude='./Data/misc' --exclude='./Data/sound' \
+    --exclude='./Data/spell' --exclude='./Data/terrain' \
+    --exclude='./Data/world' \
+    -cf - . | tar -C /wowee-build-src -xf -
+
+
+cd /wowee-build-src
+
+echo "==> [windows] Fetching external SDKs (if needed)..."
+if [ ! -f extern/FidelityFX-FSR2/src/ffx-fsr2-api/ffx_fsr2.h ]; then
+    git clone --depth 1 \
+        https://github.com/GPUOpen-Effects/FidelityFX-FSR2.git \
+        extern/FidelityFX-FSR2 || echo "Warning: FSR2 clone failed"
+fi
+
+SDK_REPO="${WOWEE_FFX_SDK_REPO:-https://github.com/Kelsidavis/FidelityFX-SDK.git}"
+SDK_REF="${WOWEE_FFX_SDK_REF:-main}"
+if [ ! -f "extern/FidelityFX-SDK/sdk/include/FidelityFX/host/ffx_frameinterpolation.h" ]; then
+    git clone --depth 1 --branch "${SDK_REF}" "${SDK_REPO}" extern/FidelityFX-SDK \
+        || echo "Warning: FidelityFX-SDK clone failed"
+fi
+
+echo "==> [windows] Generating Vulkan import library for cross-compile..."
+# Windows applications link against vulkan-1.dll (the Khronos Vulkan loader).
+# The cross-compile toolchain only ships Vulkan *headers* (via vcpkg), not the
+# import library.  Generate a minimal libvulkan-1.a from the header prototypes
+# so the linker can resolve vk* symbols → vulkan-1.dll at runtime.
+# We use the host libvulkan-dev header for function name extraction — the Vulkan
+# API prototypes are platform-independent.
+VULKAN_IMP_DIR="${OUT}/vulkan-import"
+if [ ! -f "${VULKAN_IMP_DIR}/libvulkan-1.a" ]; then
+    mkdir -p "${VULKAN_IMP_DIR}"
+    # Try vcpkg-installed header first (available on incremental builds),
+    # then fall back to the host libvulkan-dev header (always present in the image).
+    VK_HEADER="${OUT}/vcpkg_installed/x64-mingw-static/include/vulkan/vulkan_core.h"
+    if [ ! -f "${VK_HEADER}" ]; then
+        VK_HEADER="/usr/include/vulkan/vulkan_core.h"
+    fi
+    {
+        echo "LIBRARY vulkan-1.dll"
+        echo "EXPORTS"
+        grep -oP 'VKAPI_ATTR \S+ VKAPI_CALL \K(vk\w+)' "${VK_HEADER}" | sort -u | sed 's/^/    /'
+    } > "${VULKAN_IMP_DIR}/vulkan-1.def"
+    "${TARGET}-dlltool" -d "${VULKAN_IMP_DIR}/vulkan-1.def" \
+        -l "${VULKAN_IMP_DIR}/libvulkan-1.a" -m i386:x86-64
+    echo "   Generated $(wc -l < "${VULKAN_IMP_DIR}/vulkan-1.def") export entries"
+fi
+
+echo "==> [windows] Configuring with CMake (Release, Ninja, LLVM-MinGW cross)..."
+# Lock pkg-config to the cross-compiled vcpkg packages only.
+# Without this, CMake's Vulkan pkg-config fallback finds the *Linux* libvulkan-dev
+# and injects /usr/include into every MinGW compile command, which then fails
+# because the glibc-specific bits/libc-header-start.h is not in the MinGW sysroot.
+export PKG_CONFIG_LIBDIR="${OUT}/vcpkg_installed/x64-mingw-static/lib/pkgconfig"
+export PKG_CONFIG_PATH=""
+cmake -S . -B "${OUT}" \
+    -G Ninja \
+    -DCMAKE_BUILD_TYPE=Release \
+    -DCMAKE_SYSTEM_NAME=Windows \
+    -DCMAKE_C_COMPILER="${TARGET}-clang" \
+    -DCMAKE_CXX_COMPILER="${TARGET}-clang++" \
+    -DCMAKE_RC_COMPILER="${TARGET}-windres" \
+    -DCMAKE_AR="/opt/llvm-mingw/bin/llvm-ar" \
+    -DCMAKE_RANLIB="/opt/llvm-mingw/bin/llvm-ranlib" \
+    -DCMAKE_EXE_LINKER_FLAGS="-fuse-ld=lld" \
+    -DCMAKE_SHARED_LINKER_FLAGS="-fuse-ld=lld" \
+    -DCMAKE_TOOLCHAIN_FILE="${VCPKG_ROOT}/scripts/buildsystems/vcpkg.cmake" \
+    -DVCPKG_TARGET_TRIPLET=x64-mingw-static \
+    -DVCPKG_APPLOCAL_DEPS=OFF \
+    -DCMAKE_INTERPROCEDURAL_OPTIMIZATION=OFF \
+    -DWOWEE_ENABLE_ASAN=OFF
+
+echo "==> [windows] Building with ${NPROC} cores..."
+cmake --build "${OUT}" --parallel "${NPROC}"
+
+echo ""
+echo "==> [windows] Build complete. Artifacts in: ./build/windows/"
+echo "    Binary: ./build/windows/bin/wowee.exe"
diff --git a/container/build-wowee.sh b/container/build-wowee.sh
deleted file mode 100755
index aabd8396..00000000
--- a/container/build-wowee.sh
+++ /dev/null
@@ -1,14 +0,0 @@
-#!/bin/bash
-
-set -eu 
-set -o pipefail
-
-cp -r /WoWee-src /WoWee
-
-pushd /WoWee
-./build.sh
-popd
-
-pushd /WoWee/build
-cmake --install . --prefix=/build
-popd
diff --git a/container/builder-linux.Dockerfile b/container/builder-linux.Dockerfile
new file mode 100644
index 00000000..1f9e12dc
--- /dev/null
+++ b/container/builder-linux.Dockerfile
@@ -0,0 +1,33 @@
+FROM ubuntu:24.04
+
+ENV DEBIAN_FRONTEND=noninteractive
+
+RUN apt-get update && \
+    apt-get install -y --no-install-recommends \
+        cmake \
+        ninja-build \
+        build-essential \
+        pkg-config \
+        git \
+        python3 \
+        glslang-tools \
+        spirv-tools \
+        libsdl2-dev \
+        libglew-dev \
+        libglm-dev \
+        libssl-dev \
+        zlib1g-dev \
+        libavformat-dev \
+        libavcodec-dev \
+        libswscale-dev \
+        libavutil-dev \
+        libvulkan-dev \
+        vulkan-tools \
+        libstorm-dev \
+        libunicorn-dev && \
+    rm -rf /var/lib/apt/lists/*
+
+COPY build-linux.sh /build-platform.sh
+RUN chmod +x /build-platform.sh
+
+ENTRYPOINT ["/build-platform.sh"]
diff --git a/container/builder-macos.Dockerfile b/container/builder-macos.Dockerfile
new file mode 100644
index 00000000..48b47751
--- /dev/null
+++ b/container/builder-macos.Dockerfile
@@ -0,0 +1,143 @@
+FROM ubuntu:24.04 AS sdk-fetcher
+
+# Stage 1: Fetch macOS SDK from Apple's public software update catalog.
+# This avoids requiring the user to supply the SDK tarball manually.
+# The SDK is downloaded, extracted, and packaged as a .tar.gz.
+
+ENV DEBIAN_FRONTEND=noninteractive
+
+RUN apt-get update && \
+    apt-get install -y --no-install-recommends \
+        ca-certificates \
+        python3 \
+        cpio \
+        tar \
+        gzip \
+        xz-utils && \
+    rm -rf /var/lib/apt/lists/*
+
+COPY macos/sdk-fetcher.py /opt/sdk-fetcher.py
+RUN python3 /opt/sdk-fetcher.py /opt/sdk
+
+# ---------------------------------------------------------------------------
+
+FROM ubuntu:24.04 AS builder
+
+# Stage 2: macOS cross-compile image using osxcross + Clang 18.
+#
+# Target triplets (auto-detected from osxcross):
+#   arm64-apple-darwinNN  (Apple Silicon)
+#   x86_64-apple-darwinNN (Intel)
+# Default: arm64. Override with MACOS_ARCH=x86_64 env var at run time.
+
+ENV DEBIAN_FRONTEND=noninteractive
+ENV OSXCROSS_VERSION=1.5
+
+RUN apt-get update && \
+    apt-get install -y --no-install-recommends \
+        ca-certificates \
+        cmake \
+        ninja-build \
+        git \
+        python3 \
+        curl \
+        wget \
+        xz-utils \
+        zip \
+        unzip \
+        tar \
+        make \
+        patch \
+        libssl-dev \
+        zlib1g-dev \
+        pkg-config \
+        libbz2-dev \
+        libxml2-dev \
+        libz-dev \
+        liblzma-dev \
+        uuid-dev \
+        python3-lxml \
+        gnupg \
+        software-properties-common && \
+    wget -qO- https://apt.llvm.org/llvm-snapshot.gpg.key | apt-key add - && \
+    echo "deb http://apt.llvm.org/jammy/ llvm-toolchain-jammy-18 main" > /etc/apt/sources.list.d/llvm-18.list && \
+    apt-get update && \
+    apt-get install -y --no-install-recommends \
+        clang-18 \
+        lld-18 \
+        llvm-18 && \
+    ln -sf /usr/bin/clang-18 /usr/bin/clang && \
+    ln -sf /usr/bin/clang++-18 /usr/bin/clang++ && \
+    ln -sf /usr/bin/lld-18 /usr/bin/lld && \
+    ln -sf /usr/bin/ld.lld-18 /usr/bin/ld.lld && \
+    ln -sf /usr/bin/llvm-ar-18 /usr/bin/llvm-ar && \
+    rm -rf /var/lib/apt/lists/*
+
+# Build osxcross with SDK from stage 1
+RUN git clone --depth 1 https://github.com/tpoechtrager/osxcross.git /opt/osxcross
+
+COPY --from=sdk-fetcher /opt/sdk/ /opt/osxcross/tarballs/
+
+ENV MACOSX_DEPLOYMENT_TARGET=13.0
+RUN cd /opt/osxcross && \
+    unset OSXCROSS_VERSION && \
+    UNATTENDED=1 ./build.sh && \
+    rm -rf /opt/osxcross/build /opt/osxcross/tarballs
+
+ENV PATH="/opt/osxcross/target/bin:${PATH}"
+ENV OSXCROSS_TARGET_DIR="/opt/osxcross/target"
+ENV MACOSX_DEPLOYMENT_TARGET=13.0
+
+# Create unprefixed symlinks for macOS tools that vcpkg/CMake expect
+RUN cd /opt/osxcross/target/bin && \
+    for tool in install_name_tool otool lipo codesign; do \
+      src="$(ls *-apple-darwin*-"${tool}" 2>/dev/null | head -1)"; \
+      if [ -n "$src" ]; then \
+        ln -sf "$src" "$tool"; \
+      fi; \
+    done
+
+# Custom osxcross toolchain + vcpkg triplets
+COPY macos/osxcross-toolchain.cmake /opt/osxcross-toolchain.cmake
+COPY macos/triplets/ /opt/vcpkg-triplets/
+
+# Extra tools needed by vcpkg's Mach-O rpath fixup and ffmpeg x86 asm
+RUN apt-get update && \
+    apt-get install -y --no-install-recommends file nasm && \
+    rm -rf /var/lib/apt/lists/*
+
+# vcpkg — macOS cross triplets (arm64-osx-cross / x64-osx-cross)
+ENV VCPKG_ROOT=/opt/vcpkg
+RUN git clone --depth 1 https://github.com/microsoft/vcpkg.git "${VCPKG_ROOT}" && \
+    "${VCPKG_ROOT}/bootstrap-vcpkg.sh" -disableMetrics
+
+# Pre-install deps for both arches; the launcher script picks the right one at run time.
+RUN "${VCPKG_ROOT}/vcpkg" install \
+        sdl2[vulkan] \
+        openssl \
+        glew \
+        glm \
+        zlib \
+        ffmpeg \
+    --triplet arm64-osx-cross \
+    --overlay-triplets=/opt/vcpkg-triplets
+
+RUN "${VCPKG_ROOT}/vcpkg" install \
+        sdl2[vulkan] \
+        openssl \
+        glew \
+        glm \
+        zlib \
+        ffmpeg \
+    --triplet x64-osx-cross \
+    --overlay-triplets=/opt/vcpkg-triplets
+
+# Vulkan SDK headers (MoltenVK is the runtime — headers only needed to compile)
+RUN apt-get update && \
+    apt-get install -y --no-install-recommends libvulkan-dev glslang-tools && \
+    rm -rf /var/lib/apt/lists/*
+
+COPY build-macos.sh /build-platform.sh
+RUN chmod +x /build-platform.sh
+
+ENTRYPOINT ["/build-platform.sh"]
diff --git a/container/builder-ubuntu.Dockerfile b/container/builder-ubuntu.Dockerfile
deleted file mode 100644
index 26f32b50..00000000
--- a/container/builder-ubuntu.Dockerfile
+++ /dev/null
@@ -1,25 +0,0 @@
-FROM ubuntu:24.04
-
-RUN apt-get update && \
-	apt install -y \
-		cmake \
-		build-essential \
-		pkg-config \
-		git \
-		libsdl2-dev \
-		libglew-dev \
-		libglm-dev \
-		libssl-dev \
-		zlib1g-dev \
-		libavformat-dev \
-		libavcodec-dev \
-		libswscale-dev \
-		libavutil-dev \
-		libvulkan-dev \
-		vulkan-tools \
-		libstorm-dev && \
-	rm -rf /var/lib/apt/lists/*
-
-COPY build-wowee.sh /
-
-ENTRYPOINT ./build-wowee.sh
diff --git a/container/builder-windows.Dockerfile b/container/builder-windows.Dockerfile
new file mode 100644
index 00000000..0c5abf83
--- /dev/null
+++ b/container/builder-windows.Dockerfile
@@ -0,0 +1,67 @@
+FROM ubuntu:24.04
+
+# Windows cross-compile using LLVM-MinGW — best-in-class Clang/LLD toolchain
+# targeting x86_64-w64-mingw32. Produces native .exe/.dll without MSVC or Wine.
+# LLVM-MinGW ships: clang, clang++, lld, libc++ / libunwind headers, winpthreads.
+
+ENV DEBIAN_FRONTEND=noninteractive
+ENV LLVM_MINGW_VERSION=20240619
+ENV LLVM_MINGW_URL=https://github.com/mstorsjo/llvm-mingw/releases/download/${LLVM_MINGW_VERSION}/llvm-mingw-${LLVM_MINGW_VERSION}-ucrt-ubuntu-20.04-x86_64.tar.xz
+
+RUN apt-get update && \
+    apt-get install -y --no-install-recommends \
+        ca-certificates \
+        build-essential \
+        cmake \
+        ninja-build \
+        git \
+        python3 \
+        curl \
+        zip \
+        unzip \
+        tar \
+        xz-utils \
+        pkg-config \
+        nasm \
+        libssl-dev \
+        zlib1g-dev && \
+    rm -rf /var/lib/apt/lists/*
+
+# Install LLVM-MinGW toolchain
+RUN curl -fsSL "${LLVM_MINGW_URL}" -o /tmp/llvm-mingw.tar.xz && \
+    tar -xf /tmp/llvm-mingw.tar.xz -C /opt && \
+    mv /opt/llvm-mingw-${LLVM_MINGW_VERSION}-ucrt-ubuntu-20.04-x86_64 /opt/llvm-mingw && \
+    rm /tmp/llvm-mingw.tar.xz
+
+ENV PATH="/opt/llvm-mingw/bin:${PATH}"
+
+# Windows dependencies via vcpkg (static, x64-mingw-static triplet)
+ENV VCPKG_ROOT=/opt/vcpkg
+RUN git clone --depth 1 https://github.com/microsoft/vcpkg.git "${VCPKG_ROOT}" && \
+    "${VCPKG_ROOT}/bootstrap-vcpkg.sh" -disableMetrics
+
+ENV VCPKG_DEFAULT_TRIPLET=x64-mingw-static
+RUN "${VCPKG_ROOT}/vcpkg" install \
+        sdl2[vulkan] \
+        openssl \
+        glew \
+        glm \
+        zlib \
+        ffmpeg \
+    --triplet x64-mingw-static
+
+# Vulkan SDK headers (loader is linked statically via SDL2's vulkan surface)
+RUN apt-get update && \
+    apt-get install -y --no-install-recommends libvulkan-dev glslang-tools && \
+    rm -rf /var/lib/apt/lists/*
+
+# Provide a no-op powershell.exe so vcpkg's MinGW applocal post-build hook
+# exits cleanly.  The x64-mingw-static triplet is fully static (no DLLs to
+# copy), so the script has nothing to do — it just needs to not fail.
+RUN printf '#!/bin/sh\nexit 0\n' > /usr/local/bin/powershell.exe && \
+    chmod +x /usr/local/bin/powershell.exe
+
+COPY build-windows.sh /build-platform.sh
+RUN chmod +x /build-platform.sh
+
+ENTRYPOINT ["/build-platform.sh"]
diff --git a/container/macos/osxcross-toolchain.cmake b/container/macos/osxcross-toolchain.cmake
new file mode 100644
index 00000000..c432830d
--- /dev/null
+++ b/container/macos/osxcross-toolchain.cmake
@@ -0,0 +1,62 @@
+# osxcross CMake toolchain file for cross-compiling to macOS from Linux.
+# Used by vcpkg triplets and the WoWee build.
+# Auto-detects SDK, darwin version, and arch from the osxcross installation
+# and the VCPKG_OSX_ARCHITECTURES / CMAKE_OSX_ARCHITECTURES setting.
+
+set(CMAKE_SYSTEM_NAME Darwin)
+
+# ── osxcross paths ──────────────────────────────────────────────────
+set(_target_dir "/opt/osxcross/target")
+if(DEFINED ENV{OSXCROSS_TARGET_DIR})
+    set(_target_dir "$ENV{OSXCROSS_TARGET_DIR}")
+endif()
+
+# Auto-detect SDK (pick the newest if several are present)
+file(GLOB _sdk_dirs "${_target_dir}/SDK/MacOSX*.sdk")
+list(SORT _sdk_dirs)
+list(GET _sdk_dirs -1 _sdk_dir)
+set(CMAKE_OSX_SYSROOT "${_sdk_dir}" CACHE PATH "" FORCE)
+
+# Deployment target
+set(CMAKE_OSX_DEPLOYMENT_TARGET "13.0" CACHE STRING "" FORCE)
+if(DEFINED ENV{MACOSX_DEPLOYMENT_TARGET})
+    set(CMAKE_OSX_DEPLOYMENT_TARGET "$ENV{MACOSX_DEPLOYMENT_TARGET}" CACHE STRING "" FORCE)
+endif()
+
+# ── auto-detect darwin version from compiler names ──────────────────
+file(GLOB _darwin_compilers "${_target_dir}/bin/*-apple-darwin*-clang")
+list(GET _darwin_compilers 0 _first_compiler)
+get_filename_component(_compiler_name "${_first_compiler}" NAME)
+string(REGEX MATCH "apple-darwin[0-9.]+" _darwin_part "${_compiler_name}")
+
+# ── pick architecture ───────────────────────────────────────────────
+# CMAKE_OSX_ARCHITECTURES is set by vcpkg from VCPKG_OSX_ARCHITECTURES
+if(CMAKE_OSX_ARCHITECTURES STREQUAL "arm64")
+    set(_arch "arm64")
+elseif(CMAKE_OSX_ARCHITECTURES STREQUAL "x86_64")
+    set(_arch "x86_64")
+elseif(DEFINED ENV{OSXCROSS_ARCH})
+    set(_arch "$ENV{OSXCROSS_ARCH}")
+else()
+    set(_arch "arm64")
+endif()
+
+set(_host "${_arch}-${_darwin_part}")
+set(CMAKE_SYSTEM_PROCESSOR "${_arch}" CACHE STRING "" FORCE)
+
+# ── compilers ───────────────────────────────────────────────────────
+set(CMAKE_C_COMPILER   "${_target_dir}/bin/${_host}-clang"   CACHE FILEPATH "" FORCE)
+set(CMAKE_CXX_COMPILER "${_target_dir}/bin/${_host}-clang++" CACHE FILEPATH "" FORCE)
+
+# ── tools ───────────────────────────────────────────────────────────
+set(CMAKE_AR             "${_target_dir}/bin/${_host}-ar"               CACHE FILEPATH "" FORCE)
+set(CMAKE_RANLIB         "${_target_dir}/bin/${_host}-ranlib"           CACHE FILEPATH "" FORCE)
+set(CMAKE_STRIP          "${_target_dir}/bin/${_host}-strip"            CACHE FILEPATH "" FORCE)
+set(CMAKE_INSTALL_NAME_TOOL "${_target_dir}/bin/${_host}-install_name_tool" CACHE FILEPATH "" FORCE)
+
+# ── search paths ────────────────────────────────────────────────────
+set(CMAKE_FIND_ROOT_PATH "${_sdk_dir}" "${_target_dir}")
+set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
+set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
+set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
+set(CMAKE_FIND_ROOT_PATH_MODE_PACKAGE ONLY)
diff --git a/container/macos/sdk-fetcher.py b/container/macos/sdk-fetcher.py
new file mode 100644
index 00000000..cccda8ab
--- /dev/null
+++ b/container/macos/sdk-fetcher.py
@@ -0,0 +1,366 @@
+#!/usr/bin/env python3
+"""Download and extract macOS SDK from Apple's Command Line Tools package.
+
+Apple publishes Command Line Tools (CLT) packages via their publicly
+accessible software update catalog.  This script downloads the latest CLT,
+extracts just the macOS SDK, and packages it as a .tar.gz tarball suitable
+for osxcross.
+
+No Apple ID or paid developer account required.
+
+Usage:
+    python3 sdk-fetcher.py [output_dir]
+
+The script prints the absolute path of the resulting tarball to stdout.
+All progress / status messages go to stderr.
+If a cached SDK tarball already exists in output_dir, it is reused.
+
+Dependencies: python3 (>= 3.6), cpio, tar, gzip
+Optional:     bsdtar (libarchive-tools) or xar -- faster XAR extraction.
+              Falls back to a pure-Python XAR parser when neither is available.
+"""
+
+import glob
+import gzip
+import lzma
+import os
+import plistlib
+import re
+import shutil
+import struct
+import subprocess
+import sys
+import tempfile
+import urllib.request
+import xml.etree.ElementTree as ET
+import zlib
+
+# -- Configuration -----------------------------------------------------------
+
+CATALOG_URLS = [
+    # Try newest catalog first; first successful fetch wins.
+    "https://swscan.apple.com/content/catalogs/others/"
+    "index-16-15-14-13-12-10.16-10.15-10.14-10.13-10.12-10.11-10.10-10.9-"
+    "mountainlion-lion-snowleopard-leopard.merged-1.sucatalog.gz",
+
+    "https://swscan.apple.com/content/catalogs/others/"
+    "index-15-14-13-12-10.16-10.15-10.14-10.13-10.12-10.11-10.10-10.9-"
+    "mountainlion-lion-snowleopard-leopard.merged-1.sucatalog.gz",
+
+    "https://swscan.apple.com/content/catalogs/others/"
+    "index-14-13-12-10.16-10.15-10.14-10.13-10.12-10.11-10.10-10.9-"
+    "mountainlion-lion-snowleopard-leopard.merged-1.sucatalog.gz",
+]
+
+USER_AGENT = "Software%20Update"
+
+
+# -- Helpers -----------------------------------------------------------------
+
+def log(msg):
+    print(msg, file=sys.stderr, flush=True)
+
+
+# -- 1) Catalog & URL discovery ----------------------------------------------
+
+def find_sdk_pkg_url():
+    """Search Apple catalogs for the latest CLTools_macOSNMOS_SDK.pkg URL."""
+    for cat_url in CATALOG_URLS:
+        short = cat_url.split("/index-")[1][:25] + "..."
+        log(f"    Trying catalog: {short}")
+        try:
+            req = urllib.request.Request(cat_url, headers={"User-Agent": USER_AGENT})
+            with urllib.request.urlopen(req, timeout=60) as resp:
+                raw = gzip.decompress(resp.read())
+            catalog = plistlib.loads(raw)
+        except Exception as exc:
+            log(f"    -> fetch failed: {exc}")
+            continue
+
+        products = catalog.get("Products", {})
+        candidates = []
+        for pid, product in products.items():
+            post_date = str(product.get("PostDate", ""))
+            for pkg in product.get("Packages", []):
+                url = pkg.get("URL", "")
+                size = pkg.get("Size", 0)
+                if "CLTools_macOSNMOS_SDK" in url and url.endswith(".pkg"):
+                    candidates.append((post_date, url, size, pid))
+
+        if not candidates:
+            log(f"    -> no CLTools SDK packages in this catalog, trying next...")
+            continue
+
+        candidates.sort(reverse=True)
+        _date, url, size, pid = candidates[0]
+        log(f"==> Found: CLTools_macOSNMOS_SDK  (product {pid}, {size // 1048576} MB)")
+        return url
+
+    log("ERROR: No CLTools SDK packages found in any Apple catalog.")
+    sys.exit(1)
+
+
+# -- 2) Download -------------------------------------------------------------
+
+def download(url, dest):
+    """Download *url* to *dest* with a basic progress indicator."""
+    req = urllib.request.Request(url, headers={"User-Agent": USER_AGENT})
+    with urllib.request.urlopen(req, timeout=600) as resp:
+        total = int(resp.headers.get("Content-Length", 0))
+        done = 0
+        with open(dest, "wb") as f:
+            while True:
+                chunk = resp.read(1 << 20)
+                if not chunk:
+                    break
+                f.write(chunk)
+                done += len(chunk)
+                if total:
+                    pct = done * 100 // total
+                    log(f"\r    {done // 1048576} / {total // 1048576} MB  ({pct}%)")
+    log("")
+
+
+# -- 3) XAR extraction -------------------------------------------------------
+
+def extract_xar(pkg_path, dest_dir):
+    """Extract a XAR (.pkg) archive -- external tool or pure-Python fallback."""
+    for tool in ("bsdtar", "xar"):
+        if shutil.which(tool):
+            log(f"==> Extracting .pkg with {tool}...")
+            r = subprocess.run([tool, "-xf", pkg_path, "-C", dest_dir],
+                               capture_output=True)
+            if r.returncode == 0:
+                return
+            log(f"    {tool} exited {r.returncode}, trying next method...")
+
+    log("==> Extracting .pkg with built-in Python XAR parser...")
+    _extract_xar_python(pkg_path, dest_dir)
+
+
+def _extract_xar_python(pkg_path, dest_dir):
+    """Pure-Python XAR extractor (no external dependencies)."""
+    with open(pkg_path, "rb") as f:
+        raw = f.read(28)
+        if len(raw) < 28:
+            raise ValueError("File too small to be a valid XAR archive")
+        magic, hdr_size, _ver, toc_clen, _toc_ulen, _ck = struct.unpack(
+            ">4sHHQQI", raw,
+        )
+        if magic != b"xar!":
+            raise ValueError(f"Not a XAR file (magic: {magic!r})")
+
+        f.seek(hdr_size)
+        toc_xml = zlib.decompress(f.read(toc_clen))
+        heap_off = hdr_size + toc_clen
+
+        root = ET.fromstring(toc_xml)
+        toc = root.find("toc")
+        if toc is None:
+            raise ValueError("Malformed XAR: no <toc> element")
+
+        def _walk(elem, base):
+            for fe in elem.findall("file"):
+                name = fe.findtext("name", "")
+                ftype = fe.findtext("type", "file")
+                path = os.path.join(base, name)
+
+                if ftype == "directory":
+                    os.makedirs(path, exist_ok=True)
+                    _walk(fe, path)
+                    continue
+
+                de = fe.find("data")
+                if de is None:
+                    continue
+                offset = int(de.findtext("offset", "0"))
+                size = int(de.findtext("size", "0"))
+                enc_el = de.find("encoding")
+                enc = enc_el.get("style", "") if enc_el is not None else ""
+
+                os.makedirs(os.path.dirname(path), exist_ok=True)
+                f.seek(heap_off + offset)
+
+                if "gzip" in enc:
+                    with open(path, "wb") as out:
+                        out.write(zlib.decompress(f.read(size), 15 + 32))
+                elif "bzip2" in enc:
+                    import bz2
+                    with open(path, "wb") as out:
+                        out.write(bz2.decompress(f.read(size)))
+                else:
+                    with open(path, "wb") as out:
+                        rem = size
+                        while rem > 0:
+                            blk = f.read(min(rem, 1 << 20))
+                            if not blk:
+                                break
+                            out.write(blk)
+                            rem -= len(blk)
+
+        _walk(toc, dest_dir)
+
+
+# -- 4) Payload extraction (pbzx / gzip cpio) --------------------------------
+
+def _pbzx_stream(path):
+    """Yield decompressed chunks from a pbzx-compressed file."""
+    with open(path, "rb") as f:
+        if f.read(4) != b"pbzx":
+            raise ValueError("Not a pbzx file")
+        f.read(8)
+        while True:
+            hdr = f.read(16)
+            if len(hdr) < 16:
+                break
+            _usize, csize = struct.unpack(">QQ", hdr)
+            data = f.read(csize)
+            if len(data) < csize:
+                break
+            if csize == _usize:
+                yield data
+            else:
+                yield lzma.decompress(data)
+
+
+def _gzip_stream(path):
+    """Yield decompressed chunks from a gzip file."""
+    with gzip.open(path, "rb") as f:
+        while True:
+            chunk = f.read(1 << 20)
+            if not chunk:
+                break
+            yield chunk
+
+
+def _raw_stream(path):
+    """Yield raw 1 MiB chunks (last resort)."""
+    with open(path, "rb") as f:
+        while True:
+            chunk = f.read(1 << 20)
+            if not chunk:
+                break
+            yield chunk
+
+
+def extract_payload(payload_path, out_dir):
+    """Decompress a CLT Payload (pbzx or gzip cpio) into *out_dir*."""
+    with open(payload_path, "rb") as pf:
+        magic = pf.read(4)
+
+    if magic == b"pbzx":
+        log("    Payload format: pbzx (LZMA chunks)")
+        stream = _pbzx_stream(payload_path)
+    elif magic[:2] == b"\x1f\x8b":
+        log("    Payload format: gzip")
+        stream = _gzip_stream(payload_path)
+    else:
+        log(f"    Payload format: unknown (magic: {magic.hex()}), trying raw cpio...")
+        stream = _raw_stream(payload_path)
+
+    proc = subprocess.Popen(
+        ["cpio", "-id", "--quiet"],
+        stdin=subprocess.PIPE,
+        cwd=out_dir,
+        stderr=subprocess.PIPE,
+    )
+    for chunk in stream:
+        try:
+            proc.stdin.write(chunk)
+        except BrokenPipeError:
+            break
+    proc.stdin.close()
+    proc.wait()
+
+
+# -- Main --------------------------------------------------------------------
+
+def main():
+    output_dir = os.path.abspath(sys.argv[1]) if len(sys.argv) > 1 else os.getcwd()
+    os.makedirs(output_dir, exist_ok=True)
+
+    # Re-use a previously fetched SDK if present.
+    cached = glob.glob(os.path.join(output_dir, "MacOSX*.sdk.tar.*"))
+    if cached:
+        cached.sort()
+        result = os.path.realpath(cached[-1])
+        log(f"==> Using cached SDK: {os.path.basename(result)}")
+        print(result)
+        return
+
+    work = tempfile.mkdtemp(prefix="fetch-macos-sdk-")
+
+    try:
+        # 1 -- Locate SDK package URL from Apple's catalog
+        log("==> Searching Apple software-update catalogs...")
+        sdk_url = find_sdk_pkg_url()
+
+        # 2 -- Download (just the SDK component, ~55 MB)
+        pkg = os.path.join(work, "sdk.pkg")
+        log("==> Downloading CLTools SDK package...")
+        download(sdk_url, pkg)
+
+        # 3 -- Extract the flat .pkg (XAR format) to get the Payload
+        pkg_dir = os.path.join(work, "pkg")
+        os.makedirs(pkg_dir)
+        extract_xar(pkg, pkg_dir)
+        os.unlink(pkg)
+
+        # 4 -- Locate the Payload file
+        log("==> Locating SDK payload...")
+        sdk_payload = None
+        for dirpath, _dirs, files in os.walk(pkg_dir):
+            if "Payload" in files:
+                sdk_payload = os.path.join(dirpath, "Payload")
+                log(f"    Found: {os.path.relpath(sdk_payload, pkg_dir)}")
+                break
+
+        if sdk_payload is None:
+            log("ERROR: No Payload found in extracted package")
+            sys.exit(1)
+
+        # 5 -- Decompress Payload -> cpio -> filesystem
+        sdk_root = os.path.join(work, "sdk")
+        os.makedirs(sdk_root)
+        log("==> Extracting SDK from payload (this may take a minute)...")
+        extract_payload(sdk_payload, sdk_root)
+        shutil.rmtree(pkg_dir)
+
+        # 6 -- Find MacOSX*.sdk directory
+        sdk_found = None
+        for dirpath, dirs, _files in os.walk(sdk_root):
+            for d in dirs:
+                if re.match(r"MacOSX\d+(\.\d+)?\.sdk$", d):
+                    sdk_found = os.path.join(dirpath, d)
+                    break
+            if sdk_found:
+                break
+
+        if not sdk_found:
+            log("ERROR: MacOSX*.sdk directory not found.  Extracted contents:")
+            for dp, ds, fs in os.walk(sdk_root):
+                depth = dp.replace(sdk_root, "").count(os.sep)
+                if depth < 4:
+                    log(f"    {'  ' * depth}{os.path.basename(dp)}/")
+            sys.exit(1)
+
+        sdk_name = os.path.basename(sdk_found)
+        log(f"==> Found: {sdk_name}")
+
+        # 7 -- Package as .tar.gz
+        tarball = os.path.join(output_dir, f"{sdk_name}.tar.gz")
+        log(f"==> Packaging: {sdk_name}.tar.gz ...")
+        subprocess.run(
+            ["tar", "-czf", tarball, "-C", os.path.dirname(sdk_found), sdk_name],
+            check=True,
+        )
+
+        log(f"==> macOS SDK ready: {tarball}")
+        print(tarball)
+
+    finally:
+        shutil.rmtree(work, ignore_errors=True)
+
+
+if __name__ == "__main__":
+    main()
diff --git a/container/macos/triplets/arm64-osx-cross.cmake b/container/macos/triplets/arm64-osx-cross.cmake
new file mode 100644
index 00000000..5f38d553
--- /dev/null
+++ b/container/macos/triplets/arm64-osx-cross.cmake
@@ -0,0 +1,10 @@
+set(VCPKG_TARGET_ARCHITECTURE arm64)
+set(VCPKG_CRT_LINKAGE dynamic)
+set(VCPKG_LIBRARY_LINKAGE static)
+set(VCPKG_CMAKE_SYSTEM_NAME Darwin)
+
+set(VCPKG_OSX_ARCHITECTURES arm64)
+set(VCPKG_OSX_DEPLOYMENT_TARGET 13.0)
+
+# osxcross toolchain
+set(VCPKG_CHAINLOAD_TOOLCHAIN_FILE /opt/osxcross-toolchain.cmake)
diff --git a/container/macos/triplets/x64-osx-cross.cmake b/container/macos/triplets/x64-osx-cross.cmake
new file mode 100644
index 00000000..84161bba
--- /dev/null
+++ b/container/macos/triplets/x64-osx-cross.cmake
@@ -0,0 +1,10 @@
+set(VCPKG_TARGET_ARCHITECTURE x64)
+set(VCPKG_CRT_LINKAGE dynamic)
+set(VCPKG_LIBRARY_LINKAGE static)
+set(VCPKG_CMAKE_SYSTEM_NAME Darwin)
+
+set(VCPKG_OSX_ARCHITECTURES x86_64)
+set(VCPKG_OSX_DEPLOYMENT_TARGET 13.0)
+
+# osxcross toolchain
+set(VCPKG_CHAINLOAD_TOOLCHAIN_FILE /opt/osxcross-toolchain.cmake)
diff --git a/container/run-linux.ps1 b/container/run-linux.ps1
new file mode 100644
index 00000000..67ce067f
--- /dev/null
+++ b/container/run-linux.ps1
@@ -0,0 +1,64 @@
+# run-linux.ps1 — Build WoWee for Linux (amd64) inside a Docker container.
+#
+# Usage (run from project root):
+#   .\container\run-linux.ps1 [-RebuildImage]
+#
+# Environment variables:
+#   WOWEE_FFX_SDK_REPO  — FidelityFX SDK git repo URL (passed through to container)
+#   WOWEE_FFX_SDK_REF   — FidelityFX SDK git ref / tag      (passed through to container)
+
+param(
+    [switch]$RebuildImage
+)
+
+$ErrorActionPreference = "Stop"
+
+$ScriptDir   = Split-Path -Parent $MyInvocation.MyCommand.Definition
+$ProjectRoot = (Resolve-Path "$ScriptDir\..").Path
+
+$ImageName   = "wowee-builder-linux"
+$BuildOutput = "$ProjectRoot\build\linux"
+
+# Verify Docker is available
+if (-not (Get-Command docker -ErrorAction SilentlyContinue)) {
+    Write-Error "docker is not installed or not in PATH."
+    exit 1
+}
+
+# Build the image (skip if already present and -RebuildImage not given)
+$imageExists = docker image inspect $ImageName 2>$null
+if ($RebuildImage -or -not $imageExists) {
+    Write-Host "==> Building Docker image: $ImageName"
+    docker build `
+        -f "$ScriptDir\builder-linux.Dockerfile" `
+        -t $ImageName `
+        "$ScriptDir"
+    if ($LASTEXITCODE -ne 0) { exit $LASTEXITCODE }
+} else {
+    Write-Host "==> Using existing Docker image: $ImageName"
+}
+
+# Create output directory on the host
+New-Item -ItemType Directory -Force -Path $BuildOutput | Out-Null
+
+Write-Host "==> Starting Linux build (output: $BuildOutput)"
+
+$dockerArgs = @(
+    "run", "--rm",
+    "--mount", "type=bind,src=$ProjectRoot,dst=/src,readonly",
+    "--mount", "type=bind,src=$BuildOutput,dst=/out"
+)
+
+if ($env:WOWEE_FFX_SDK_REPO) {
+    $dockerArgs += @("--env", "WOWEE_FFX_SDK_REPO=$env:WOWEE_FFX_SDK_REPO")
+}
+if ($env:WOWEE_FFX_SDK_REF) {
+    $dockerArgs += @("--env", "WOWEE_FFX_SDK_REF=$env:WOWEE_FFX_SDK_REF")
+}
+
+$dockerArgs += $ImageName
+
+& docker @dockerArgs
+if ($LASTEXITCODE -ne 0) { exit $LASTEXITCODE }
+
+Write-Host "==> Linux build complete. Artifacts in: $BuildOutput"
diff --git a/container/run-linux.sh b/container/run-linux.sh
new file mode 100755
index 00000000..db45bea7
--- /dev/null
+++ b/container/run-linux.sh
@@ -0,0 +1,58 @@
+#!/usr/bin/env bash
+# run-linux.sh — Build WoWee for Linux (amd64) inside a Docker container.
+#
+# Usage (run from project root):
+#   ./container/run-linux.sh [--rebuild-image]
+#
+# Environment variables:
+#   WOWEE_FFX_SDK_REPO  — FidelityFX SDK git repo URL (passed through to container)
+#   WOWEE_FFX_SDK_REF   — FidelityFX SDK git ref / tag      (passed through to container)
+#   REBUILD_IMAGE       — Set to 1 to force a fresh docker build (same as --rebuild-image)
+
+set -euo pipefail
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+PROJECT_ROOT="$(cd "${SCRIPT_DIR}/.." && pwd)"
+
+IMAGE_NAME="wowee-builder-linux"
+BUILD_OUTPUT="${PROJECT_ROOT}/build/linux"
+
+# Parse arguments
+REBUILD_IMAGE="${REBUILD_IMAGE:-0}"
+for arg in "$@"; do
+  case "$arg" in
+    --rebuild-image) REBUILD_IMAGE=1 ;;
+    *) echo "Unknown argument: $arg" >&2; exit 1 ;;
+  esac
+done
+
+# Verify Docker is available
+if ! command -v docker &>/dev/null; then
+  echo "Error: docker is not installed or not in PATH." >&2
+  exit 1
+fi
+
+# Build the image (skip if already present and --rebuild-image not given)
+if [[ "$REBUILD_IMAGE" == "1" ]] || ! docker image inspect "$IMAGE_NAME" &>/dev/null; then
+  echo "==> Building Docker image: ${IMAGE_NAME}"
+  docker build \
+    -f "${SCRIPT_DIR}/builder-linux.Dockerfile" \
+    -t "$IMAGE_NAME" \
+    "${SCRIPT_DIR}"
+else
+  echo "==> Using existing Docker image: ${IMAGE_NAME}"
+fi
+
+# Create output directory on the host
+mkdir -p "$BUILD_OUTPUT"
+
+echo "==> Starting Linux build (output: ${BUILD_OUTPUT})"
+
+docker run --rm \
+  --mount "type=bind,src=${PROJECT_ROOT},dst=/src,readonly" \
+  --mount "type=bind,src=${BUILD_OUTPUT},dst=/out" \
+  ${WOWEE_FFX_SDK_REPO:+--env "WOWEE_FFX_SDK_REPO=${WOWEE_FFX_SDK_REPO}"} \
+  ${WOWEE_FFX_SDK_REF:+--env "WOWEE_FFX_SDK_REF=${WOWEE_FFX_SDK_REF}"} \
+  "$IMAGE_NAME"
+
+echo "==> Linux build complete. Artifacts in: ${BUILD_OUTPUT}"
diff --git a/container/run-macos.ps1 b/container/run-macos.ps1
new file mode 100644
index 00000000..b690edfb
--- /dev/null
+++ b/container/run-macos.ps1
@@ -0,0 +1,71 @@
+# run-macos.ps1 — Cross-compile WoWee for macOS (arm64 or x86_64) inside a Docker container.
+#
+# Usage (run from project root):
+#   .\container\run-macos.ps1 [-RebuildImage] [-Arch arm64|x86_64]
+#
+# The macOS SDK is fetched automatically inside the Docker build from Apple's
+# public software update catalog.  No manual SDK download required.
+#
+# Environment variables:
+#   WOWEE_FFX_SDK_REPO  — FidelityFX SDK git repo URL (passed through to container)
+#   WOWEE_FFX_SDK_REF   — FidelityFX SDK git ref / tag      (passed through to container)
+
+param(
+    [switch]$RebuildImage,
+    [ValidateSet("arm64", "x86_64")]
+    [string]$Arch = "arm64"
+)
+
+$ErrorActionPreference = "Stop"
+
+$ScriptDir   = Split-Path -Parent $MyInvocation.MyCommand.Definition
+$ProjectRoot = (Resolve-Path "$ScriptDir\..").Path
+
+$ImageName   = "wowee-builder-macos"
+$BuildOutput = "$ProjectRoot\build\macos"
+
+# Verify Docker is available
+if (-not (Get-Command docker -ErrorAction SilentlyContinue)) {
+    Write-Error "docker is not installed or not in PATH."
+    exit 1
+}
+
+# Build the image (skip if already present and -RebuildImage not given)
+$imageExists = docker image inspect $ImageName 2>$null
+if ($RebuildImage -or -not $imageExists) {
+    Write-Host "==> Building Docker image: $ImageName"
+    Write-Host "    (SDK will be fetched automatically from Apple's catalog)"
+    docker build `
+        -f "$ScriptDir\builder-macos.Dockerfile" `
+        -t $ImageName `
+        "$ScriptDir"
+    if ($LASTEXITCODE -ne 0) { exit $LASTEXITCODE }
+} else {
+    Write-Host "==> Using existing Docker image: $ImageName"
+}
+
+# Create output directory on the host
+New-Item -ItemType Directory -Force -Path $BuildOutput | Out-Null
+
+Write-Host "==> Starting macOS cross-compile build (arch=$Arch, output: $BuildOutput)"
+
+$dockerArgs = @(
+    "run", "--rm",
+    "--mount", "type=bind,src=$ProjectRoot,dst=/src,readonly",
+    "--mount", "type=bind,src=$BuildOutput,dst=/out",
+    "--env", "MACOS_ARCH=$Arch"
+)
+
+if ($env:WOWEE_FFX_SDK_REPO) {
+    $dockerArgs += @("--env", "WOWEE_FFX_SDK_REPO=$env:WOWEE_FFX_SDK_REPO")
+}
+if ($env:WOWEE_FFX_SDK_REF) {
+    $dockerArgs += @("--env", "WOWEE_FFX_SDK_REF=$env:WOWEE_FFX_SDK_REF")
+}
+
+$dockerArgs += $ImageName
+
+& docker @dockerArgs
+if ($LASTEXITCODE -ne 0) { exit $LASTEXITCODE }
+
+Write-Host "==> macOS cross-compile build complete. Artifacts in: $BuildOutput"
diff --git a/container/run-macos.sh b/container/run-macos.sh
new file mode 100755
index 00000000..63e1b971
--- /dev/null
+++ b/container/run-macos.sh
@@ -0,0 +1,74 @@
+#!/usr/bin/env bash
+# run-macos.sh — Cross-compile WoWee for macOS (arm64 or x86_64) inside a Docker container.
+#
+# Usage (run from project root):
+#   ./container/run-macos.sh [--rebuild-image]
+#
+# The macOS SDK is fetched automatically inside the Docker build from Apple's
+# public software update catalog.  No manual SDK download required.
+#
+# Environment variables:
+#   MACOS_ARCH          — Target arch: arm64 (default) or x86_64
+#   WOWEE_FFX_SDK_REPO  — FidelityFX SDK git repo URL (passed through to container)
+#   WOWEE_FFX_SDK_REF   — FidelityFX SDK git ref / tag      (passed through to container)
+#   REBUILD_IMAGE       — Set to 1 to force a fresh docker build (same as --rebuild-image)
+#
+# Toolchain: osxcross (Clang + Apple ld)
+# vcpkg triplets: arm64-osx-cross (arm64) / x64-osx-cross (x86_64)
+
+set -euo pipefail
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+PROJECT_ROOT="$(cd "${SCRIPT_DIR}/.." && pwd)"
+
+IMAGE_NAME="wowee-builder-macos"
+MACOS_ARCH="${MACOS_ARCH:-arm64}"
+BUILD_OUTPUT="${PROJECT_ROOT}/build/macos"
+
+# Parse arguments
+REBUILD_IMAGE="${REBUILD_IMAGE:-0}"
+for arg in "$@"; do
+  case "$arg" in
+    --rebuild-image) REBUILD_IMAGE=1 ;;
+    *) echo "Unknown argument: $arg" >&2; exit 1 ;;
+  esac
+done
+
+# Validate arch
+if [[ "$MACOS_ARCH" != "arm64" && "$MACOS_ARCH" != "x86_64" ]]; then
+  echo "Error: MACOS_ARCH must be 'arm64' or 'x86_64' (got: ${MACOS_ARCH})" >&2
+  exit 1
+fi
+
+# Verify Docker is available
+if ! command -v docker &>/dev/null; then
+  echo "Error: docker is not installed or not in PATH." >&2
+  exit 1
+fi
+
+# Build the image (skip if already present and --rebuild-image not given)
+if [[ "$REBUILD_IMAGE" == "1" ]] || ! docker image inspect "$IMAGE_NAME" &>/dev/null; then
+  echo "==> Building Docker image: ${IMAGE_NAME}"
+  echo "    (SDK will be fetched automatically from Apple's catalog)"
+  docker build \
+    -f "${SCRIPT_DIR}/builder-macos.Dockerfile" \
+    -t "$IMAGE_NAME" \
+    "${SCRIPT_DIR}"
+else
+  echo "==> Using existing Docker image: ${IMAGE_NAME}"
+fi
+
+# Create output directory on the host
+mkdir -p "$BUILD_OUTPUT"
+
+echo "==> Starting macOS cross-compile build (arch=${MACOS_ARCH}, output: ${BUILD_OUTPUT})"
+
+docker run --rm \
+  --mount "type=bind,src=${PROJECT_ROOT},dst=/src,readonly" \
+  --mount "type=bind,src=${BUILD_OUTPUT},dst=/out" \
+  --env "MACOS_ARCH=${MACOS_ARCH}" \
+  ${WOWEE_FFX_SDK_REPO:+--env "WOWEE_FFX_SDK_REPO=${WOWEE_FFX_SDK_REPO}"} \
+  ${WOWEE_FFX_SDK_REF:+--env "WOWEE_FFX_SDK_REF=${WOWEE_FFX_SDK_REF}"} \
+  "$IMAGE_NAME"
+
+echo "==> macOS cross-compile build complete. Artifacts in: ${BUILD_OUTPUT}"
diff --git a/container/run-windows.ps1 b/container/run-windows.ps1
new file mode 100644
index 00000000..1ce6c724
--- /dev/null
+++ b/container/run-windows.ps1
@@ -0,0 +1,64 @@
+# run-windows.ps1 — Cross-compile WoWee for Windows (x86_64) inside a Docker container.
+#
+# Usage (run from project root):
+#   .\container\run-windows.ps1 [-RebuildImage]
+#
+# Environment variables:
+#   WOWEE_FFX_SDK_REPO  — FidelityFX SDK git repo URL (passed through to container)
+#   WOWEE_FFX_SDK_REF   — FidelityFX SDK git ref / tag      (passed through to container)
+
+param(
+    [switch]$RebuildImage
+)
+
+$ErrorActionPreference = "Stop"
+
+$ScriptDir   = Split-Path -Parent $MyInvocation.MyCommand.Definition
+$ProjectRoot = (Resolve-Path "$ScriptDir\..").Path
+
+$ImageName   = "wowee-builder-windows"
+$BuildOutput = "$ProjectRoot\build\windows"
+
+# Verify Docker is available
+if (-not (Get-Command docker -ErrorAction SilentlyContinue)) {
+    Write-Error "docker is not installed or not in PATH."
+    exit 1
+}
+
+# Build the image (skip if already present and -RebuildImage not given)
+$imageExists = docker image inspect $ImageName 2>$null
+if ($RebuildImage -or -not $imageExists) {
+    Write-Host "==> Building Docker image: $ImageName"
+    docker build `
+        -f "$ScriptDir\builder-windows.Dockerfile" `
+        -t $ImageName `
+        "$ScriptDir"
+    if ($LASTEXITCODE -ne 0) { exit $LASTEXITCODE }
+} else {
+    Write-Host "==> Using existing Docker image: $ImageName"
+}
+
+# Create output directory on the host
+New-Item -ItemType Directory -Force -Path $BuildOutput | Out-Null
+
+Write-Host "==> Starting Windows cross-compile build (output: $BuildOutput)"
+
+$dockerArgs = @(
+    "run", "--rm",
+    "--mount", "type=bind,src=$ProjectRoot,dst=/src,readonly",
+    "--mount", "type=bind,src=$BuildOutput,dst=/out"
+)
+
+if ($env:WOWEE_FFX_SDK_REPO) {
+    $dockerArgs += @("--env", "WOWEE_FFX_SDK_REPO=$env:WOWEE_FFX_SDK_REPO")
+}
+if ($env:WOWEE_FFX_SDK_REF) {
+    $dockerArgs += @("--env", "WOWEE_FFX_SDK_REF=$env:WOWEE_FFX_SDK_REF")
+}
+
+$dockerArgs += $ImageName
+
+& docker @dockerArgs
+if ($LASTEXITCODE -ne 0) { exit $LASTEXITCODE }
+
+Write-Host "==> Windows cross-compile build complete. Artifacts in: $BuildOutput"
diff --git a/container/run-windows.sh b/container/run-windows.sh
new file mode 100755
index 00000000..b7a89ff7
--- /dev/null
+++ b/container/run-windows.sh
@@ -0,0 +1,61 @@
+#!/usr/bin/env bash
+# run-windows.sh — Cross-compile WoWee for Windows (x86_64) inside a Docker container.
+#
+# Usage (run from project root):
+#   ./container/run-windows.sh [--rebuild-image]
+#
+# Environment variables:
+#   WOWEE_FFX_SDK_REPO  — FidelityFX SDK git repo URL (passed through to container)
+#   WOWEE_FFX_SDK_REF   — FidelityFX SDK git ref / tag      (passed through to container)
+#   REBUILD_IMAGE       — Set to 1 to force a fresh docker build (same as --rebuild-image)
+#
+# Toolchain: LLVM-MinGW (Clang + LLD) targeting x86_64-w64-mingw32-ucrt
+# vcpkg triplet: x64-mingw-static
+
+set -euo pipefail
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+PROJECT_ROOT="$(cd "${SCRIPT_DIR}/.." && pwd)"
+
+IMAGE_NAME="wowee-builder-windows"
+BUILD_OUTPUT="${PROJECT_ROOT}/build/windows"
+
+# Parse arguments
+REBUILD_IMAGE="${REBUILD_IMAGE:-0}"
+for arg in "$@"; do
+  case "$arg" in
+    --rebuild-image) REBUILD_IMAGE=1 ;;
+    *) echo "Unknown argument: $arg" >&2; exit 1 ;;
+  esac
+done
+
+# Verify Docker is available
+if ! command -v docker &>/dev/null; then
+  echo "Error: docker is not installed or not in PATH." >&2
+  exit 1
+fi
+
+# Build the image (skip if already present and --rebuild-image not given)
+if [[ "$REBUILD_IMAGE" == "1" ]] || ! docker image inspect "$IMAGE_NAME" &>/dev/null; then
+  echo "==> Building Docker image: ${IMAGE_NAME}"
+  docker build \
+    -f "${SCRIPT_DIR}/builder-windows.Dockerfile" \
+    -t "$IMAGE_NAME" \
+    "${SCRIPT_DIR}"
+else
+  echo "==> Using existing Docker image: ${IMAGE_NAME}"
+fi
+
+# Create output directory on the host
+mkdir -p "$BUILD_OUTPUT"
+
+echo "==> Starting Windows cross-compile build (output: ${BUILD_OUTPUT})"
+
+docker run --rm \
+  --mount "type=bind,src=${PROJECT_ROOT},dst=/src,readonly" \
+  --mount "type=bind,src=${BUILD_OUTPUT},dst=/out" \
+  ${WOWEE_FFX_SDK_REPO:+--env "WOWEE_FFX_SDK_REPO=${WOWEE_FFX_SDK_REPO}"} \
+  ${WOWEE_FFX_SDK_REF:+--env "WOWEE_FFX_SDK_REF=${WOWEE_FFX_SDK_REF}"} \
+  "$IMAGE_NAME"
+
+echo "==> Windows cross-compile build complete. Artifacts in: ${BUILD_OUTPUT}"
diff --git a/resources/wowee.rc b/resources/wowee.rc
index a39b5c55..45939fce 100644
--- a/resources/wowee.rc
+++ b/resources/wowee.rc
@@ -1 +1 @@
-IDI_APP_ICON ICON "assets\\wowee.ico"
+IDI_APP_ICON ICON "assets/wowee.ico"
diff --git a/vcpkg.json b/vcpkg.json
index 60b8639e..7399d6ff 100644
--- a/vcpkg.json
+++ b/vcpkg.json
@@ -10,6 +10,7 @@
     "glew",
     "glm",
     "zlib",
-    "ffmpeg"
+    "ffmpeg",
+    "vulkan-headers"
   ]
 }