chore: sync from fn-registry agent

2026-05-11 16:28:43 +02:00
commit bed33856e7
3 changed files with 424 additions and 0 deletions
@@ -0,0 +1,98 @@
+# engine_smoke — gamedev stack smoke test. Issue 0072a.
+# Standalone — does NOT use add_imgui_app() / fn_framework.
+#
+# Two build modes:
+#   1. As subdir of cpp/ (cmake -S cpp -B build): cpp/CMakeLists.txt already
+#      adds vendor/sdl3 and exposes SDL3::SDL3-static. We just link.
+#   2. As top-level (cmake -S cpp/apps/engine_smoke -B build) — used by the
+#      WASM pipeline and any standalone build. We do project() + manually
+#      add_subdirectory the vendored SDL3.
+
+cmake_minimum_required(VERSION 3.16)
+
+# Detect mode: top-level vs subdir.
+if(CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR)
+    project(engine_smoke CXX)
+    set(_TOP_LEVEL TRUE)
+else()
+    set(_TOP_LEVEL FALSE)
+endif()
+
+set(CMAKE_CXX_STANDARD 17)
+set(CMAKE_CXX_STANDARD_REQUIRED ON)
+set(CMAKE_POSITION_INDEPENDENT_CODE ON)
+
+# Resolve the repo's cpp/vendor regardless of build mode.
+get_filename_component(_REPO_CPP_ROOT ${CMAKE_CURRENT_LIST_DIR}/../.. ABSOLUTE)
+set(_VENDOR ${_REPO_CPP_ROOT}/vendor)
+
+if(_TOP_LEVEL)
+    # Bring in SDL3 ourselves.
+    if(NOT EXISTS ${_VENDOR}/sdl3/CMakeLists.txt)
+        message(FATAL_ERROR "SDL3 vendoring missing: ${_VENDOR}/sdl3 — see cpp/vendor/sdl3.VENDORING.md")
+    endif()
+    set(SDL_SHARED OFF CACHE BOOL "" FORCE)
+    set(SDL_STATIC ON CACHE BOOL "" FORCE)
+    set(SDL_TEST_LIBRARY OFF CACHE BOOL "" FORCE)
+    set(SDL_TESTS OFF CACHE BOOL "" FORCE)
+    set(SDL_EXAMPLES OFF CACHE BOOL "" FORCE)
+    set(SDL_INSTALL OFF CACHE BOOL "" FORCE)
+    set(SDL_X11_XSCRNSAVER OFF CACHE BOOL "" FORCE)
+    add_subdirectory(${_VENDOR}/sdl3 ${CMAKE_BINARY_DIR}/_sdl3 EXCLUDE_FROM_ALL)
+endif()
+
+# --- ImGui (sources we need) ---
+set(_IMGUI_SRCS
+    ${_VENDOR}/imgui/imgui.cpp
+    ${_VENDOR}/imgui/imgui_demo.cpp
+    ${_VENDOR}/imgui/imgui_draw.cpp
+    ${_VENDOR}/imgui/imgui_tables.cpp
+    ${_VENDOR}/imgui/imgui_widgets.cpp
+    ${_VENDOR}/imgui/backends/imgui_impl_sdl3.cpp
+    ${_VENDOR}/imgui/backends/imgui_impl_opengl3.cpp
+)
+
+add_executable(engine_smoke
+    main.cpp
+    ${_IMGUI_SRCS}
+)
+
+target_include_directories(engine_smoke PRIVATE
+    ${_VENDOR}/imgui
+    ${_VENDOR}/sokol
+)
+
+target_link_libraries(engine_smoke PRIVATE SDL3::SDL3-static)
+
+if(NOT EMSCRIPTEN)
+    find_package(OpenGL REQUIRED)
+    target_link_libraries(engine_smoke PRIVATE OpenGL::GL)
+endif()
+
+if(EMSCRIPTEN)
+    set_target_properties(engine_smoke PROPERTIES SUFFIX ".html")
+    target_compile_options(engine_smoke PRIVATE
+        -Os
+        -fno-exceptions
+        -fno-rtti
+        -ffunction-sections
+        -fdata-sections
+    )
+    target_link_options(engine_smoke PRIVATE
+        -Os
+        -sUSE_WEBGL2=1
+        -sFULL_ES3=1
+        -sALLOW_MEMORY_GROWTH=1
+        -sINITIAL_MEMORY=33554432
+        -sASSERTIONS=0
+        -sENVIRONMENT=web
+        -Wl,--gc-sections
+        # NOTE: -sFILESYSTEM=0 + --closure=1 broke under SDL3 (closure
+        # references undeclared FS). Saves ~30KB JS + ~30KB wasm if
+        # we ever stub SDL3 filesystem refs out. Re-enable per app.
+    )
+endif()
+
+if(WIN32)
+    set_target_properties(engine_smoke PROPERTIES WIN32_EXECUTABLE TRUE)
+endif()