Add GameActivity support and macOS ANGLE Vulkan compatibility

[Icehunter]

Summary

Adds support for Android GameActivity SDK (used by Minecraft 1.21+) with fake JNI class implementations, enabling Minecraft Bedrock 1.26.x to run on macOS ARM64 with GLES 3.1 via ANGLE Vulkan.

Changes

• 8 fake JNI classes for GameActivity SDK (GameActivity, Configuration, LocaleList, WindowInsetsCompat, Insets, State, InputConnection, Locale)
• Null-checks on GameActivity callbacks with onResume lifecycle
• AAssetManager_fromJava returning FakeAssetManager
• ANativeWindow stubs (setBuffersGeometry, getFormat, acquire, release)
• Locale methods (getLanguage, getScript, getCountry, getVariant)
• Zero-init GameActivity structs to prevent crashes
• Removed ANGLE version gate that blocked OpenGL ES surface creation

Testing

Requires building mcpelauncher from source with this branch.

Prerequisites: cmake 4.x, a C++17 compiler, SDL3, and the usual mcpelauncher dependencies.

# Clone manifest and checkout this branch for mcpelauncher-client
git clone --recursive https://github.com/minecraft-linux/mcpelauncher-manifest.git
cd mcpelauncher-manifest
cd mcpelauncher-client && git remote add pr https://github.com/Icehunter/mcpelauncher-client.git
git fetch pr feature/gameactivity-macos-support
git checkout pr/feature/gameactivity-macos-support
cd ..

# Also apply the mcpelauncher-core fix (PR #23)
cd mcpelauncher-core && git remote add pr https://github.com/Icehunter/mcpelauncher-core.git
git fetch pr feature/gameactivity-macos-support
git checkout pr/feature/gameactivity-macos-support
cd ..

# Build
mkdir build && cd build
cmake .. -DCMAKE_BUILD_TYPE=Release -DCMAKE_POLICY_VERSION_MINIMUM=4.0
make -j$(sysctl -n hw.ncpu)

To run Minecraft 1.26.10.4 with Vibrant Visuals on macOS ARM64:

• Requires upstream google/angle built with Vulkan backend
• Requires MoltenVK (homebrew or custom build)
• Set environment: VK_ICD_FILENAMES, ANGLE_DEFAULT_PLATFORM=vulkan
• Launch with -fes flag

Tested on Apple M5 Pro, macOS 26.3, Minecraft Bedrock 1.26.10.4 with Vibrant Visuals enabled.

https://youtu.be/lBNuIqISYa4

[Icehunter]

This is also related to:

google/angle#103
KhronosGroup/MoltenVK#2702

Locally when I run everything after a build a get a substantial improvement in vibrant visuals, but i'm still fighting over some artifacts on/in water, and some leaf shading during the day.

[ChristopherHX]

I am a bit confused, since for me

• gameactivity support is already sufficient
• moltenvk also works (gated by mc version, because of breaking older devices)
• your video also have the very similar mvk glitches than me without all the additional changes
  • I switched to Fancy and recommend that to everyone

kosmickrisp might do better than mvk. Did the switch in a few days to not need to compile anything additionally