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Steam Input as the primary guest-input path (optional, SDK-gated)

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Add SteamInputSource: initializes SteamAPI + Steam Input, loads a bundled action
manifest via SetInputActionManifestFilePath (no partner-backend config needed),
and reads the GameControls action set into CoopPadState -- falling back to XInput
per slot, and to pure XInput if Steam isn't available, so the host always runs.

Enabled automatically when the Steamworks SDK is vendored at
third_party/steamworks_sdk/ (auto-detected by CMake; gitignored and never
committed -- the build is XInput-only without it). Stages steam_api64.dll + the
manifest next to the host and builds coop_steam_input_probe (a console smoke test).

Verified: the probe initializes against the live Steam client and enumerates
controllers; the host degrades gracefully when launched standalone. All 5 tests
pass. Reading actual controller state needs a pad bound through Steam Input for
the running (donor) appid, which XInput otherwise covers.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
This commit is contained in:
BlackMark
2026-06-20 11:51:58 +02:00
parent b1f8783321
commit edf2da69d8
8 changed files with 528 additions and 7 deletions
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47
host/CMakeLists.txt
View File

@@ -37,3 +37,50 @@ target_link_libraries(coop_host PRIVATE
ole32)
set_target_properties(coop_host PROPERTIES OUTPUT_NAME "coop_host")
# Optional Steam Input: enabled automatically when the Steamworks SDK is vendored
# under third_party/steamworks_sdk (it isn't redistributable, so it's gitignored
# and never committed). Without it, the host builds XInput-only.
set(COOP_STEAM_SDK_DIR "${CMAKE_SOURCE_DIR}/third_party/steamworks_sdk/sdk")
if(EXISTS "${COOP_STEAM_SDK_DIR}/public/steam/steam_api.h")
message(STATUS "Steamworks SDK found -> Steam Input enabled")
target_sources(coop_host PRIVATE src/input/steam_input_source.cpp)
target_compile_definitions(coop_host PRIVATE COOP_WITH_STEAM)
target_include_directories(coop_host SYSTEM PRIVATE "${COOP_STEAM_SDK_DIR}/public")
# The SDK headers trip /W4 (strncpy, non-UTF-8 bytes); silence for this TU only.
set_source_files_properties(src/input/steam_input_source.cpp PROPERTIES
COMPILE_OPTIONS "/wd4996;/wd4828")
target_link_libraries(coop_host PRIVATE
"${COOP_STEAM_SDK_DIR}/redistributable_bin/win64/steam_api64.lib")
# Stage steam_api64.dll + the action manifest next to coop_host.exe.
add_custom_command(TARGET coop_host POST_BUILD
COMMAND ${CMAKE_COMMAND} -E copy_if_different
"${COOP_STEAM_SDK_DIR}/redistributable_bin/win64/steam_api64.dll"
"$<TARGET_FILE_DIR:coop_host>/steam_api64.dll"
COMMAND ${CMAKE_COMMAND} -E copy_if_different
"${CMAKE_CURRENT_SOURCE_DIR}/assets/steam_input_actions.vdf"
"$<TARGET_FILE_DIR:coop_host>/steam_input_actions.vdf"
VERBATIM)
# Console smoke test for Steam Input (reuses the shipping source). Not a ctest
# (needs Steam running + an appid); run manually from bin/<config>/.
add_executable(coop_steam_input_probe
${CMAKE_SOURCE_DIR}/tools/steam_input_probe/main.cpp
src/input/steam_input_source.cpp
src/input/xinput_source.cpp)
target_include_directories(coop_steam_input_probe PRIVATE src)
target_include_directories(coop_steam_input_probe SYSTEM PRIVATE "${COOP_STEAM_SDK_DIR}/public")
target_compile_definitions(coop_steam_input_probe PRIVATE COOP_WITH_STEAM)
set_source_files_properties(src/input/steam_input_source.cpp PROPERTIES COMPILE_OPTIONS "/wd4996;/wd4828")
target_link_libraries(coop_steam_input_probe PRIVATE
coop_common
xinput
"${COOP_STEAM_SDK_DIR}/redistributable_bin/win64/steam_api64.lib")
add_custom_command(TARGET coop_steam_input_probe POST_BUILD
COMMAND ${CMAKE_COMMAND} -E copy_if_different
"${COOP_STEAM_SDK_DIR}/redistributable_bin/win64/steam_api64.dll"
"$<TARGET_FILE_DIR:coop_steam_input_probe>/steam_api64.dll"
VERBATIM)
else()
message(STATUS "Steamworks SDK not found -> Steam Input disabled (XInput only)")
endif()