add webassembly build

.github/workflows/emscripten.yml

@@ -0,0 +1,59 @@
+name: Emscripten build
+
+on:
+  push:
+    branches:
+    - master
+    paths-ignore:
+    - 'android/**'
+    - 'build-data/osx/**'
+    - 'doc/**'
+    - 'doxygen_doc/**'
+    - 'lang/**'
+    - 'lgtm/**'
+    - 'tools/**'
+    - '!tools/format/**'
+    - 'utilities/**'
+  pull_request:
+    branches:
+    - master
+    paths-ignore:
+    - 'android/**'
+    - 'build-data/osx/**'
+    - 'doc/**'
+    - 'doxygen_doc/**'
+    - 'lang/**'
+    - 'lgtm/**'
+    - 'tools/**'
+    - '!tools/format/**'
+    - 'utilities/**'
+
+# 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: Prepare web data
+      run: ./build-scripts/prepare-web-data.sh
+
+    - 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/*

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.F
 
 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 ($(NATIVE), emscripten)
+  CXX=emcc
+  LD=emcc
+
+  # Flags that are common across compile and link phases.
+  EMCC_COMMON_FLAGS = -sUSE_SDL=2 -sUSE_SDL_IMAGE=2 -sUSE_SDL_TTF=2 -sSDL2_IMAGE_FORMATS=['png']
+
+  ifneq ($(RELEASE), 1)
+    EMCC_COMMON_FLAGS += -g
+  endif
+
+  CXXFLAGS += $(EMCC_COMMON_FLAGS)
+  LDFLAGS += $(EMCC_COMMON_FLAGS)
+
+  LDFLAGS += --preload-file web_bundle@/
+  LDFLAGS += -sEXPORTED_RUNTIME_METHODS=['FS','stackTrace','jsStackTrace']
+  LDFLAGS += -sINITIAL_MEMORY=512MB
+  LDFLAGS += -sMAXIMUM_MEMORY=4GB
+  LDFLAGS += -sALLOW_MEMORY_GROWTH
+  LDFLAGS += -sSTACK_SIZE=262144
+  LDFLAGS += -sASYNCIFY
+  LDFLAGS += -sASYNCIFY_STACK_SIZE=16384
+  LDFLAGS += -sENVIRONMENT=web
+  LDFLAGS += -lidbfs.js
+  LDFLAGS += -lembind
+  LDFLAGS += -sWASM_BIGINT # Browser will require BigInt support.
+  LDFLAGS += -sMAX_WEBGL_VERSION=2
+
+  ifeq ($(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

build-scripts/build-emscripten.sh

@@ -0,0 +1,7 @@
+#!/bin/bash
+set -exo pipefail
+
+emsdk install 3.1.51
+emsdk activate 3.1.51
+
+make -j`nproc` NATIVE=emscripten BACKTRACE=0 TILES=1 TESTS=0 RUNTESTS=0 RELEASE=1 cataclysm-tiles.js

build-scripts/prepare-web-data.sh

@@ -0,0 +1,22 @@
+#!/bin/bash
+set -exo pipefail
+
+rm -rf web_bundle
+
+BUNDLE_DIR=web_bundle
+DATA_DIR=$BUNDLE_DIR/data
+mkdir -p $DATA_DIR
+cp -R data/{core,font,fontdata.json,json,mods,names,raw,motd,credits,title,help} $DATA_DIR/
+cp -R gfx $BUNDLE_DIR/
+
+# Remove .DS_Store files.
+find web_bundle -name ".DS_Store" -type f -exec rm {} \;
+
+# Remove obsolete mods.
+echo "Removing obsolete mods..."
+for MOD_DIR in $DATA_DIR/mods/*/ ; do
+    if jq -e '.[] | select(.type == "MOD_INFO") | .obsolete' "$MOD_DIR/modinfo.json" >/dev/null; then
+        echo "$MOD_DIR is obsolete, excluding from web_bundle..."
+        rm -rf $MOD_DIR
+    fi
+done

build-scripts/prepare-web.sh

@@ -0,0 +1,10 @@
+#!/bin/bash
+set -exo pipefail
+
+mkdir -p build/
+cp \
+  index.html \
+  cataclysm-tiles.{data,js,wasm} \
+  data/font/Terminus.ttf \
+  build
+cp data/cataicon.ico build/favicon.ico