mod-player/build-wasm.sh at main · ford442/mod-player · GitHub

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#!/usr/bin/env bash
# =======================================================================
# build-wasm.sh  –  OpenMPT WASM AudioWorklet Build Script
#
# Usage:
#   ./build-wasm.sh [--debug]
#
# Output:
#   public/worklets/openmpt-worklet.js   (Emscripten glue)
#   public/worklets/openmpt-worklet.wasm (WebAssembly binary)
#   public/worklets/openmpt-worklet.aw.js (AudioWorklet bootstrap)
#
# Requirements:
#   - Emscripten 3.1+ (emsdk) installed
#   - git, make in PATH
# =======================================================================

set -e

echo "=== OpenMPT WASM AudioWorklet Build ==="

# ── 1. Source emsdk ─────────────────────────────────────────────────
if ! command -v emcc &>/dev/null; then
    EMSDK_CANDIDATES=(
        "/opt/emsdk/emsdk_env.sh"
        "/workspaces/codepit/emsdk/emsdk_env.sh"
        "$HOME/emsdk/emsdk_env.sh"
        "/usr/local/emsdk/emsdk_env.sh"
    )
    for f in "${EMSDK_CANDIDATES[@]}"; do
        if [ -f "$f" ]; then
            echo "Sourcing emsdk from $f..."
            source "$f"
            break
        fi
    done
fi

if ! command -v emcc &>/dev/null; then
    echo "❌ emcc not found. Please activate emsdk first:" >&2
    echo "   source /path/to/emsdk/emsdk_env.sh" >&2
    exit 1
fi

export EM_CACHE="${HOME}/.emscripten_cache"
mkdir -p "$EM_CACHE"

echo "📦 Emscripten: $(emcc --version | head -1)"

# ── 2. Download libopenmpt ──────────────────────────────────────────
LIBOPENMPT_VERSION="0.8.4"
LIBOPENMPT_DIR="libopenmpt-${LIBOPENMPT_VERSION}+release.makefile"

if [ ! -d "$LIBOPENMPT_DIR" ]; then
    echo "🔨 Downloading libopenmpt ${LIBOPENMPT_VERSION}..."
    wget -q "https://lib.openmpt.org/files/libopenmpt/src/${LIBOPENMPT_DIR}.tar.gz" -O libopenmpt.tar.gz
    tar xzf libopenmpt.tar.gz
    rm libopenmpt.tar.gz
fi

# ── 3. Build libopenmpt ─────────────────────────────────────────────
if [ ! -f "$LIBOPENMPT_DIR/bin/libopenmpt.a" ]; then
    echo "🔨 Building libopenmpt..."
    cd "$LIBOPENMPT_DIR"
    make CONFIG=emscripten -j2
    cd ..
fi

echo "✅ libopenmpt ready!"

# ── 4. Clean and prepare output directories ─────────────────────────
rm -rf public/worklets
mkdir -p public/worklets

# ── 5. Compile AudioWorklet ─────────────────────────────────────────
echo "Compiling AudioWorklet..."

DEBUG_FLAGS="-O3 -DNDEBUG"
if [[ "${1:-}" == "--debug" ]]; then
    DEBUG_FLAGS="-O0 -g -DDEBUG -sASSERTIONS=2"
    echo "🔧 DEBUG mode"
else
    echo "🔧 RELEASE mode"
fi

emcc \
    $DEBUG_FLAGS \
    -std=c++17 \
    \
    -s AUDIO_WORKLET=1 \
    -s WASM_WORKERS=1 \
    -s ALLOW_MEMORY_GROWTH=1 \
    -s ENVIRONMENT=web,worker \
    -s MODULARIZE=1 \
    -s EXPORT_NAME="createOpenMPTModule" \
    -s SINGLE_FILE=0 \
    -s INITIAL_MEMORY=33554432 \
    -s STACK_SIZE=131072 \
    \
    -s EXPORTED_RUNTIME_METHODS="['ccall','cwrap','UTF8ToString','stringToUTF8','lengthBytesUTF8','getValue','setValue']" \
    -s EXPORTED_FUNCTIONS="['_init_audio','_load_module','_resume_audio','_suspend_audio','_seek_order_row','_set_loop','_set_volume','_poll_position','_get_audio_context','_get_worklet_node','_cleanup_audio','_get_num_channels','_get_num_orders','_get_order_pattern','_get_pattern_num_rows','_get_pattern_row_channel_command','_malloc','_free']" \
    \
    -I"./${LIBOPENMPT_DIR}/include" \
    -L"./${LIBOPENMPT_DIR}/bin" \
    -lopenmpt \
    \
    cpp/openmpt_wrapper.cpp \
    cpp/worklet_processor.cpp \
    \
    --pre-js cpp/pre.js \
    \
    -o public/worklets/openmpt-worklet.js \
    --no-entry

echo "✅ Build complete!"
ls -la public/worklets/