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cmake_minimum_required(VERSION 3.16)
project(clonk_tennis C)
set(CMAKE_C_STANDARD 17)
set(CMAKE_C_STANDARD_REQUIRED ON)
set(CMAKE_EXPORT_COMPILE_COMMANDS ON) # for clangd (see .clangd)
if(NOT CMAKE_BUILD_TYPE AND NOT CMAKE_CONFIGURATION_TYPES)
set(CMAKE_BUILD_TYPE Debug CACHE STRING "" FORCE)
endif()
include(FetchContent)
# --- raylib: windowing, rendering, input (native + web) ---
set(BUILD_EXAMPLES OFF CACHE BOOL "" FORCE)
set(BUILD_GAMES OFF CACHE BOOL "" FORCE)
FetchContent_Declare(
raylib
URL https://github.com/raysan5/raylib/archive/refs/tags/5.5.tar.gz
)
# --- box3d: 3D rigid body physics (Erin Catto). Only the library builds via
# FetchContent: its samples/tests (and their forced -pthread) are gated
# behind PROJECT_IS_TOP_LEVEL, and it sets its own SIMD flags for wasm. ---
FetchContent_Declare(
box3d
URL https://github.com/erincatto/box3d/archive/refs/tags/v0.1.0.tar.gz
)
FetchContent_MakeAvailable(raylib box3d)
add_executable(tennis src/main.c)
target_link_libraries(tennis PRIVATE raylib box3d::box3d)
if(NOT EMSCRIPTEN)
# main.c pokes GLFW directly (glfwSetInputMode, to undo raylib's
# raw-mouse-motion default); use the GLFW bundled inside raylib.
target_include_directories(tennis PRIVATE
"${raylib_SOURCE_DIR}/src/external/glfw/include")
endif()
# Where the game finds its models at runtime: baked into the wasm bundle on
# web, read straight from the source tree natively (dev builds only).
if(EMSCRIPTEN)
target_compile_definitions(tennis PRIVATE ASSETS_DIR="assets")
else()
target_compile_definitions(tennis PRIVATE ASSETS_DIR="${CMAKE_CURRENT_SOURCE_DIR}/assets")
endif()
if(EMSCRIPTEN)
# Work around an LLVM optimizer crash in emcc's clang (6.0.3) that segfaults
# while compiling some Box3D files at -O2/-O3 (independent of SIMD). Build the
# physics library at -O1 on web; it's more than fast enough for this game.
# The trailing -O1 wins over the build-type -O3 for this target only.
if(TARGET box3d)
target_compile_options(box3d PRIVATE -O1)
endif()
# Produce tennis.html + tennis.js + tennis.wasm
set_target_properties(tennis PROPERTIES SUFFIX ".html")
target_compile_definitions(tennis PRIVATE PLATFORM_WEB)
target_link_options(tennis PRIVATE
-sUSE_GLFW=3
-sALLOW_MEMORY_GROWTH=1
# dr_mp3's whole-file decode (raylib LoadSound on .mp3) keeps ~30KB of
# scratch structs on the stack and overflows Emscripten's 64KB default,
# crashing at startup with "memory access out of bounds".
-sSTACK_SIZE=262144
-sGL_ENABLE_GET_PROC_ADDRESS=1
# Emscripten 4+ stopped putting the heap views on Module by default,
# but raylib's miniaudio audio callback reads Module.HEAPF32 — without
# this every audio tick throws "Cannot read properties of undefined
# (reading 'buffer')" in the ScriptProcessorNode handler.
"-sEXPORTED_RUNTIME_METHODS=HEAP8,HEAPU8,HEAP16,HEAPU16,HEAP32,HEAPU32,HEAPF32,HEAPF64"
--shell-file "${CMAKE_CURRENT_SOURCE_DIR}/shell.html"
--preload-file "${CMAKE_CURRENT_SOURCE_DIR}/assets@assets"
)
# Also expose the page as index.html so a plain directory server's bare
# URL (e.g. http://localhost:8000/) serves the game, not a file listing.
add_custom_command(TARGET tennis POST_BUILD
COMMAND ${CMAKE_COMMAND} -E copy_if_different
"$<TARGET_FILE:tennis>" "${CMAKE_CURRENT_BINARY_DIR}/index.html"
VERBATIM
)
# `cmake --install` publishes just the runtime files (what a web server
# needs), leaving all the CMake/emscripten machinery in the build dir.
install(FILES
"${CMAKE_CURRENT_BINARY_DIR}/index.html"
"${CMAKE_CURRENT_BINARY_DIR}/tennis.html"
"${CMAKE_CURRENT_BINARY_DIR}/tennis.js"
"${CMAKE_CURRENT_BINARY_DIR}/tennis.wasm"
"${CMAKE_CURRENT_BINARY_DIR}/tennis.data"
DESTINATION .
COMPONENT web # keeps raylib/box3d's own install rules out
)
endif()
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