Initial workspace: GPU context, compute pass, adaptive Slint shell
Establishes the v0.1 foundations on both platforms: - dr-types: SourceRef (never a filesystem path — Android SAF has none), Format, Availability, Validator with ETag quote normalisation - dr-gpu: wgpu device, compute pass writing a storage texture, resize - dr-ui: Slint shell with FR-UI-1 adaptive layout, computed in Rust to avoid a binding loop - docker/android: pinned toolchain, verified producing API 28 ARM binaries Measured the cost of the temporary CPU readback path (dr-gpu bench): compute is 0.06-0.28ms across sizes while readback is 0.63-7.43ms, so readback is 90-96% of frame time and scales with area. Recorded in ARCH §6.1 — this is why spike S1 is the priority. Mitigations pending S1: reuse the staging buffer, apply at most one resize per frame, and cap render resolution at 2048 on the long edge. 10 tests passing; core crates cross-compile for aarch64-linux-android.
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# DarkRoom — reproducible Android build environment
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#
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# Pins the entire toolchain: JDK, Android SDK, NDK, Rust, and the four Android
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# targets. Both CI and local builds use this image, so "works on my machine"
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# and "works in CI" are the same machine.
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#
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# Build: podman build -t darkroom-android:latest docker/android
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# Use: ./docker/android/build.sh cargo ndk -t arm64-v8a build --release
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FROM docker.io/library/debian:bookworm-slim
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# ---------------------------------------------------------------------------
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# Versions — pinned deliberately. Bumping any of these is a reviewable change,
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# not something that drifts underneath the build.
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# ---------------------------------------------------------------------------
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ARG JDK_VERSION=17
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# Compile SDK / target API.
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ARG ANDROID_API=36
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# Minimum supported API — the level native code links against (NFR-COMPAT-1).
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# 28 (Android 9) matches the floor where Vulkan support is dependable.
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# cargo-ndk otherwise defaults to 21, which is far below what this app needs.
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ARG MIN_API=28
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ARG BUILD_TOOLS=36.0.0
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ARG NDK_VERSION=27.2.12479018
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ARG CMDLINE_TOOLS=13114758
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# Must satisfy cargo-ndk's MSRV (4.1.x needs >= 1.86) as well as our own crates.
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ARG RUST_VERSION=1.92.0
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# JDK 17, not the host's 25: the Android Gradle Plugin supports 17 as its
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# stable target, and newer JDKs regularly break Gradle in ways that cost more
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# time than they save.
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ENV DEBIAN_FRONTEND=noninteractive \
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ANDROID_HOME=/opt/android-sdk \
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ANDROID_SDK_ROOT=/opt/android-sdk \
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JAVA_HOME=/usr/lib/jvm/java-${JDK_VERSION}-openjdk-amd64 \
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CARGO_HOME=/opt/cargo \
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RUSTUP_HOME=/opt/rustup \
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PATH=/opt/cargo/bin:/opt/android-sdk/cmdline-tools/latest/bin:/opt/android-sdk/platform-tools:$PATH
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# ---------------------------------------------------------------------------
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# System packages
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# ---------------------------------------------------------------------------
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RUN apt-get update && apt-get install -y --no-install-recommends \
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ca-certificates curl unzip git \
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openjdk-${JDK_VERSION}-jdk-headless \
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# Slint / winit build-time needs
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pkg-config libfontconfig1-dev \
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# native deps that may need building for host-side tooling
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build-essential cmake python3 \
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&& rm -rf /var/lib/apt/lists/*
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# ---------------------------------------------------------------------------
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# Android SDK + NDK
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# ---------------------------------------------------------------------------
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RUN mkdir -p ${ANDROID_HOME}/cmdline-tools \
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&& curl -fsSL -o /tmp/tools.zip \
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"https://dl.google.com/android/repository/commandlinetools-linux-${CMDLINE_TOOLS}_latest.zip" \
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&& unzip -q /tmp/tools.zip -d ${ANDROID_HOME}/cmdline-tools \
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&& mv ${ANDROID_HOME}/cmdline-tools/cmdline-tools ${ANDROID_HOME}/cmdline-tools/latest \
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&& rm /tmp/tools.zip
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RUN yes | sdkmanager --licenses > /dev/null 2>&1 || true \
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&& sdkmanager --install \
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"platform-tools" \
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"platforms;android-${ANDROID_API}" \
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"build-tools;${BUILD_TOOLS}" \
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"ndk;${NDK_VERSION}" \
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> /dev/null
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ENV ANDROID_NDK_HOME=${ANDROID_HOME}/ndk/${NDK_VERSION} \
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ANDROID_NDK_ROOT=${ANDROID_HOME}/ndk/${NDK_VERSION}
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# ---------------------------------------------------------------------------
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# Rust + Android targets
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#
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# All four ABIs. arm64-v8a covers essentially every current device; the others
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# exist so an ABI-specific build break is caught here rather than at release.
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# ---------------------------------------------------------------------------
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RUN curl -fsSL https://sh.rustup.rs | sh -s -- \
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-y --no-modify-path --profile minimal --default-toolchain ${RUST_VERSION} \
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&& rustup target add \
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aarch64-linux-android \
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armv7-linux-androideabi \
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x86_64-linux-android \
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i686-linux-android \
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&& rustup component add rustfmt clippy \
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&& cargo install cargo-ndk --locked \
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&& chmod -R a+rwX ${CARGO_HOME} ${RUSTUP_HOME}
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# ---------------------------------------------------------------------------
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# Linker configuration
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#
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# cargo-ndk normally handles this, but setting it explicitly means plain
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# `cargo build --target …` works too, which matters for tooling that shells
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# out to cargo directly (rust-analyzer, cargo-metadata).
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# ---------------------------------------------------------------------------
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ENV NDK_BIN=${ANDROID_NDK_HOME}/toolchains/llvm/prebuilt/linux-x86_64/bin
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# Linkers target MIN_API, not ANDROID_API — the binary must run on the oldest
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# supported device, while the SDK compiles against the newest.
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ENV CARGO_TARGET_AARCH64_LINUX_ANDROID_LINKER=${NDK_BIN}/aarch64-linux-android${MIN_API}-clang \
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CARGO_TARGET_ARMV7_LINUX_ANDROIDEABI_LINKER=${NDK_BIN}/armv7a-linux-androideabi${MIN_API}-clang \
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CARGO_TARGET_X86_64_LINUX_ANDROID_LINKER=${NDK_BIN}/x86_64-linux-android${MIN_API}-clang \
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CARGO_TARGET_I686_LINUX_ANDROID_LINKER=${NDK_BIN}/i686-linux-android${MIN_API}-clang
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# cargo-ndk reads this; without it it defaults to API 21.
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ENV CARGO_NDK_PLATFORM=${MIN_API} \
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ANDROID_PLATFORM=${MIN_API}
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# Shared cargo registry cache — bind-mount over this to persist across runs.
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VOLUME ["/opt/cargo/registry"]
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WORKDIR /work
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# Rootless podman maps the host user into the container, so the image must not
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# assume a fixed uid. Keep world-writable toolchain dirs and let the caller
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# pass --user.
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RUN chmod -R a+rwX ${ANDROID_HOME}
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CMD ["/bin/bash"]
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