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Add: support for emscripten (play-OpenTTD-in-the-browser)

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Emscripten compiles to WASM, which can be loaded via
HTML / JavaScript. This allows you to play OpenTTD inside a
browser.

Co-authored-by: milek7 <me@milek7.pl>
This commit is contained in:
Patric Stout
2020-12-05 21:57:47 +01:00
committed by Patric Stout
parent 2da07f7615
commit d15dc9f40f
25 changed files with 844 additions and 12 deletions
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37
CMakeLists.txt
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@@ -15,6 +15,10 @@ if(NOT CMAKE_BUILD_TYPE)
set(CMAKE_BUILD_TYPE Debug)
endif()
if (EMSCRIPTEN)
set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} "${CMAKE_SOURCE_DIR}/os/emscripten/cmake")
endif()
set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} "${CMAKE_SOURCE_DIR}/cmake")
set(CMAKE_OSX_DEPLOYMENT_TARGET 10.9)
@@ -232,6 +236,39 @@ if(APPLE)
)
endif()
if(EMSCRIPTEN)
add_library(WASM::WASM INTERFACE IMPORTED)
# Allow heap-growth, and start with a bigger memory size.
target_link_libraries(WASM::WASM INTERFACE "-s ALLOW_MEMORY_GROWTH=1")
target_link_libraries(WASM::WASM INTERFACE "-s INITIAL_MEMORY=33554432")
# Export functions to Javascript.
target_link_libraries(WASM::WASM INTERFACE "-s EXPORTED_FUNCTIONS='[\"_main\", \"_em_openttd_add_server\"]' -s EXTRA_EXPORTED_RUNTIME_METHODS='[\"cwrap\"]'")
# Preload all the files we generate during build.
# As we do not compile with FreeType / FontConfig, we also have no way to
# render several languages (like Chinese, ..), so where do you draw the
# line what languages to include and which not? In the end, especially as
# the more languages you add the slower downloading becomes, we decided to
# only ship the English language.
target_link_libraries(WASM::WASM INTERFACE "--preload-file ${CMAKE_BINARY_DIR}/baseset@/baseset")
target_link_libraries(WASM::WASM INTERFACE "--preload-file ${CMAKE_BINARY_DIR}/lang/english.lng@/lang/english.lng")
target_link_libraries(WASM::WASM INTERFACE "--preload-file ${CMAKE_SOURCE_DIR}/bin/ai@/ai")
target_link_libraries(WASM::WASM INTERFACE "--preload-file ${CMAKE_SOURCE_DIR}/bin/game@/game")
# We use IDBFS for persistent storage.
target_link_libraries(WASM::WASM INTERFACE "-lidbfs.js")
# Use custom pre-js and shell.html.
target_link_libraries(WASM::WASM INTERFACE "--pre-js ${CMAKE_SOURCE_DIR}/os/emscripten/pre.js")
target_link_libraries(WASM::WASM INTERFACE "--shell-file ${CMAKE_SOURCE_DIR}/os/emscripten/shell.html")
# Build the .html (which builds the .js, .wasm, and .data too).
set_target_properties(openttd PROPERTIES SUFFIX ".html")
target_link_libraries(openttd WASM::WASM)
endif()
if(NOT PERSONAL_DIR STREQUAL "(not set)")
add_definitions(
-DWITH_PERSONAL_DIR