backport wasm build to 0.H

.github/workflows/emscripten.yml

@@ -0,0 +1,31 @@
+name: Emscripten build
+
+on:
+  workflow_call:
+
+# We only care about the latest revision of a PR, so cancel previous instances.
+concurrency:
+  group: emscripten-build-${{ github.event.pull_request.number || github.ref_name }}
+  cancel-in-progress: true
+
+jobs:
+  build_catatclysm:
+    name: Build
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v3
+
+    - uses: mymindstorm/setup-emsdk@v13
+
+    - name: Build with emcc (emscripten)
+      run: ./build-scripts/build-emscripten.sh
+
+    - name: Assemble web bundle
+      run: ./build-scripts/prepare-web.sh
+
+    - name: Create artifact
+      uses: actions/upload-artifact@v4
+      with:
+        name: play-cdda
+        path: build/*

.github/workflows/matrix.yml

@@ -348,3 +348,8 @@ jobs:
         name: cata_test
         path: tests/cata_test*
         if-no-files-found: ignore
+  emscripten:
+    needs: [ varied_builds ]
+    uses: ./.github/workflows/emscripten.yml
+    if: ${{ success() && github.event.pull_request.draft == false }}
+    secrets: inherit

.github/workflows/release.yml

@@ -162,6 +162,14 @@ jobs:
             artifact: android-bundle
             ext: aab
             content: application/aap
+          - name: WebAssembly Bundle
+            os: ubuntu-latest
+            mxe: none
+            artifact: wasm
+            ext: zip
+            content: application/zip
+            sound: 0
+            wasm: true
     name: ${{ matrix.name }}
     runs-on: ${{ matrix.os }}
     permissions: write-all
@@ -217,11 +225,14 @@ jobs:
           shasum -a 256 -c ./build-scripts/libbacktrace-${{ matrix.mxe }}-w64-mingw32-sha256
           sudo tar -xzf libbacktrace-${{ matrix.mxe }}-w64-mingw32.tar.gz --exclude=LICENSE -C /opt/mxe/usr/${{ matrix.mxe }}-w64-mingw32.static.gcc12
       - name: Install dependencies (Linux)
-        if: runner.os == 'Linux' && matrix.mxe == 'none' && matrix.android == 'none' 
+        if: runner.os == 'Linux' && matrix.mxe == 'none' && matrix.android == 'none' && !matrix.wasm
         run: |
           sudo apt-get update
           sudo apt-get install libncursesw5-dev libsdl2-dev libsdl2-ttf-dev libsdl2-image-dev \
             libsdl2-mixer-dev libpulse-dev ccache gettext parallel
+      - name: Install Emscripten (WebAssembly)
+        if: matrix.wasm
+        uses: mymindstorm/setup-emsdk@v13
       - name: Install runtime dependencies (mac)
         if: runner.os == 'macOS'
         uses: BrettDong/setup-sdl2-frameworks@v1
@@ -250,10 +261,16 @@ jobs:
         run: |
           lang/compile_mo.sh all
       - name: Build CDDA (linux)
-        if: runner.os == 'Linux' && matrix.mxe == 'none' && matrix.android == 'none' && matrix.artifact != 'linux-objectcreator-x64'
+        if: runner.os == 'Linux' && matrix.mxe == 'none' && matrix.android == 'none' && matrix.artifact != 'linux-objectcreator-x64' && !matrix.wasm
         run: |
           make -j$((`nproc`+0)) TILES=${{ matrix.tiles }} SOUND=${{ matrix.tiles }} RELEASE=1 LOCALIZE=1 LANGUAGES=all BACKTRACE=1 PCH=0 bindist
           mv cataclysmdda-0.H.tar.gz cdda-${{ matrix.artifact }}-${{ needs.release.outputs.timestamp }}.tar.gz
+      - name: Build CDDA (WebAssembly)
+        if: matrix.wasm && success()
+        run: |
+          ./build-scripts/build-emscripten.sh
+          ./build-scripts/prepare-web.sh
+          (cd build && zip ../cdda-${{ matrix.artifact }}-${{ needs.release.outputs.timestamp }}.${{ matrix.ext }} *)
       - name: Login to GitHub Container Registry
         if: matrix.artifact == 'windows-objectcreator-x64' || matrix.artifact == 'linux-objectcreator-x64'
         uses: docker/login-action@v2 

Makefile

@@ -22,6 +22,8 @@
 #   Run: make NATIVE=win32
 # OS X
 #   Run: make NATIVE=osx
+# Emscripten
+#   Run: make NATIVE=emscripten
 
 # Build types:
 # Debug (no optimizations)
@@ -112,6 +114,10 @@ WARNINGS = \
   -Wno-unknown-warning-option \
   -Wno-dangling-reference \
   -Wno-c++20-compat
+ifeq ($(NATIVE), emscripten)
+  # The EM_ASM macro triggers this warning.
+  WARNINGS += -Wno-gnu-zero-variadic-macro-arguments
+endif
 # Uncomment below to disable warnings
 #WARNINGS = -w
 DEBUGSYMS = -g
@@ -144,6 +150,9 @@ VERSION = 0.H
 
 TARGET_NAME = cataclysm
 TILES_TARGET_NAME = $(TARGET_NAME)-tiles
+ifeq ($(NATIVE), emscripten)
+  TILES_TARGET_NAME = $(TARGET_NAME)-tiles.js
+endif
 
 TARGET = $(BUILD_PREFIX)$(TARGET_NAME)
 TILESTARGET = $(BUILD_PREFIX)$(TILES_TARGET_NAME)
@@ -389,6 +398,8 @@ ifeq ($(RELEASE), 1)
     else
       OPTLEVEL = -O3
     endif
+  else ifeq ($(NATIVE), emscripten)
+    OPTLEVEL = -Os
   else
     # MXE ICE Workaround
     # known bad on 4.9.3 and 4.9.4, if it gets fixed this could include a version test too
@@ -457,7 +468,9 @@ else
     # way to turn off optimization (make NOOPT=1) entirely.
     OPTLEVEL = -O0
   else
-    ifeq ($(shell $(CXX) -E -Og - < /dev/null > /dev/null 2>&1 && echo fog),fog)
+    ifeq ($(NATIVE),emscripten)
+      OPTLEVEL = -O3
+    else ifeq ($(shell $(CXX) -E -Og - < /dev/null > /dev/null 2>&1 && echo fog),fog)
       OPTLEVEL = -Og
     else
       OPTLEVEL = -O0
@@ -618,6 +631,47 @@ ifeq ($(NATIVE), cygwin)
   TARGETSYSTEM=CYGWIN
 endif
 
+# Emscripten
+ifeq ($(NATIVE), emscripten)
+  CXX=emcc
+  LD=emcc
+
+  # Flags that are common across compile and link phases.
+  EMCC_COMMON_FLAGS = -sUSE_SDL=2 -sUSE_SDL_IMAGE=2 -sUSE_SDL_TTF=2 -sSDL2_IMAGE_FORMATS=['png'] -fexceptions
+
+  ifneq ($(RELEASE), 1)
+    EMCC_COMMON_FLAGS += -g
+  endif
+
+  CXXFLAGS += $(EMCC_COMMON_FLAGS)
+  LDFLAGS += $(EMCC_COMMON_FLAGS)
+
+  LDFLAGS += -sFORCE_FILESYSTEM
+  LDFLAGS += -sEXPORTED_RUNTIME_METHODS=['FS','stackTrace','jsStackTrace']
+  LDFLAGS += -sINITIAL_MEMORY=512MB
+  LDFLAGS += -sMAXIMUM_MEMORY=4GB
+  LDFLAGS += -sALLOW_MEMORY_GROWTH
+  LDFLAGS += -sSTACK_SIZE=262144
+  LDFLAGS += -sASYNCIFY
+  LDFLAGS += -sASYNCIFY_STACK_SIZE=16384
+  LDFLAGS += -sENVIRONMENT=web
+  LDFLAGS += -lidbfs.js
+  LDFLAGS += -lembind
+  LDFLAGS += -sWASM_BIGINT # Browser will require BigInt support.
+  LDFLAGS += -sMAX_WEBGL_VERSION=2
+
+  ifeq ($(RELEASE), 1)
+    # Release-mode Linker flags.
+    LDFLAGS += -Os
+    LDFLAGS += -sLZ4
+  else
+    # Debug mode linker flags.
+    LDFLAGS += -O1 # Emscripten link time is slow, so use low optimization level.
+    LDFLAGS += -sFS_DEBUG
+    LDFLAGS += -gseparate-dwarf
+  endif
+endif
+
 # MXE cross-compile to win32
 ifneq (,$(findstring mingw32,$(CROSS)))
   DEFINES += -DCROSS_LINUX
@@ -716,7 +770,7 @@ ifeq ($(TILES), 1)
         LDFLAGS += -lSDL2_mixer
       endif
     endif
-  else # not osx
+  else ifneq ($(NATIVE),emscripten)
     CXXFLAGS += $(shell $(PKG_CONFIG) --cflags sdl2 SDL2_image SDL2_ttf)
 
     ifeq ($(STATIC), 1)
@@ -961,7 +1015,9 @@ $(TARGET): $(OBJS)
 ifeq ($(RELEASE), 1)
   ifndef DEBUG_SYMBOLS
     ifneq ($(BACKTRACE),1)
+      ifneq ($(NATIVE), emscripten)
 	$(STRIP) $(TARGET)
+      endif
     endif
   endif
 endif