Remove FindSDL2 find-module, use sdl2-config.cmake instead
This requires SDL >= 2.0.4.
Since <https://bugzilla.libsdl.org/show_bug.cgi?id=2464> was fixed in
SDL 2.0.4, SDL behaves as a CMake "config-file package", even if it was
not itself built using CMake: it installs a sdl2-config.cmake file to
${libdir}/cmake/SDL2, which tells CMake where to find SDL's headers and
library, analogous to a pkg-config .pc file.
As a result, we no longer need to copy/paste a "find-module package"
to be able to find a system copy of SDL >= 2.0.4 with find_package(SDL2).
Find-module packages are now discouraged by the CMake developers, in
favour of having upstream projects behave as config-file packages.
This results in a small API change: FindSDL2 used to set SDL2_INCLUDE_DIR
and SDL2_LIBRARY, but the standard behaviour for config-file packages is
to set <name>_INCLUDE_DIRS and <name>_LIBRARIES. Use the CONFIG keyword
to make sure we search in config-file package mode, and will not find a
FindSDL2.cmake in some other directory that implements the old interface.
In addition to deleting redundant code, this avoids some assumptions in
FindSDL2 about the layout of a SDL installation. The current libsdl2-dev
package in Debian breaks those assumptions; this is considered a bug
and will hopefully be fixed soon, but it illustrates how fragile these
assumptions can be. We can be more robust against different installation
layouts by relying on SDL's own CMake integration.
When linking to a copy of CMake in a non-standard location, users can
now set the SDL2_DIR or CMAKE_PREFIX_PATH environment variable to point
to it; previously, these users would have used the SDL2DIR environment
variable. This continues to be unnecessary if using matching system-wide
installations of CMake and SDL2, for example both from Debian.
#the usual set of dependencies
find_package(OpenGL REQUIRED)
find_package(SDL2 REQUIRED CONFIG)
find_package(SDL2_mixer 2 REQUIRED)
find_package(SDL2_net 2 REQUIRED)
find_package(SDL2_image 2 REQUIRED)
find_package(SDL2_ttf 2 REQUIRED)
#compile our rtl implementation
include_directories(${CMAKE_CURRENT_SOURCE_DIR}/rtl)
include_directories(${PHYSFS_INCLUDE_DIR})
include_directories(${PHYSLAYER_INCLUDE_DIR})
include_directories(${LUA_INCLUDE_DIR})
include_directories(${SDL2_INCLUDE_DIRS})
add_subdirectory(rtl)
# convert list into pascal array
if(FONTS_DIRS)
list(LENGTH FONTS_DIRS ndirs)
set(FONTS_DIRS_ARRAY "array [0..${ndirs}] of PChar = (")
foreach(fontdir ${FONTS_DIRS})
set(FONTS_DIRS_ARRAY "${FONTS_DIRS_ARRAY}\n_P'${fontdir}',")
endforeach(fontdir)
set(FONTS_DIRS_ARRAY "${FONTS_DIRS_ARRAY}\nnil);\n")
else(FONTS_DIRS)
set(FONTS_DIRS_ARRAY "array [0..1] of PChar = (nil, nil);")
endif(FONTS_DIRS)
configure_file(${CMAKE_SOURCE_DIR}/hedgewars/config.inc.in ${CMAKE_CURRENT_BINARY_DIR}/config.inc)
#get the list of pas files that are going to be converted and compiled
file(GLOB engine_sources_pas "${CMAKE_SOURCE_DIR}/hedgewars/*.pas")
list(REMOVE_ITEM engine_sources_pas "${CMAKE_SOURCE_DIR}/hedgewars/uTouch.pas")
list(REMOVE_ITEM engine_sources_pas "${CMAKE_SOURCE_DIR}/hedgewars/PNGh.pas")
list(REMOVE_ITEM engine_sources_pas "${CMAKE_SOURCE_DIR}/hedgewars/pas2cSystem.pas")
list(REMOVE_ITEM engine_sources_pas "${CMAKE_SOURCE_DIR}/hedgewars/pas2cRedo.pas")
list(REMOVE_ITEM engine_sources_pas "${CMAKE_SOURCE_DIR}/hedgewars/hwLibrary.pas")
if(NOVIDEOREC)
list(REMOVE_ITEM engine_sources_pas "${CMAKE_SOURCE_DIR}/hedgewars/uVideoRec.pas")
endif()
if(NOT GL2)
list(REMOVE_ITEM engine_sources_pas "${CMAKE_SOURCE_DIR}/hedgewars/uMatrix.pas")
endif()
#remove and readd hwengine so that it is compiled first, compiling every other file in the process
list(REMOVE_ITEM engine_sources_pas ${CMAKE_SOURCE_DIR}/hedgewars/hwengine.pas)
list(APPEND engine_sources_pas ${CMAKE_SOURCE_DIR}/hedgewars/hwengine.pas)
#process files .pas -> .c
foreach(sourcefile ${engine_sources_pas})
get_filename_component(sourcename ${sourcefile} NAME_WE) #drops .pas
list(APPEND engine_sources "${CMAKE_CURRENT_BINARY_DIR}/${sourcename}.c")
endforeach()
#add again files for external functions and for fpcrtl_ functions
list(APPEND engine_sources_pas ${CMAKE_SOURCE_DIR}/hedgewars/pas2cSystem.pas)
list(APPEND engine_sources_pas ${CMAKE_SOURCE_DIR}/hedgewars/pas2cRedo.pas)
set(pas2c_args -n hwengine
-i ${CMAKE_SOURCE_DIR}/hedgewars
-o ${CMAKE_CURRENT_BINARY_DIR}
-a ${CMAKE_CURRENT_BINARY_DIR}
-d ENDIAN_LITTLE
-d DEBUGFILE)
if(BUILD_ENGINE_JS)
set(pas2c_args ${pas2c_args} -d WEBGL)
endif()
if(BUILD_ENGINE_LIBRARY)
set(pas2c_args ${pas2c_args} -d HWLIBRARY)
endif()
if(GL2)
set(pas2c_args ${pas2c_args} -d GL2)
endif()
if(APPLE)
set(pas2c_args ${pas2c_args} -d DARWIN)
endif()
if(LIBAV_FOUND)
add_subdirectory(${CMAKE_SOURCE_DIR}/hedgewars/avwrapper ${CMAKE_CURRENT_BINARY_DIR}/avwrapper)
list(APPEND HW_LINK_LIBS avwrapper)
set(pas2c_args ${pas2c_args} -d USE_VIDEO_RECORDING)
endif()
#invoke pas2c on main module, it will call all the others
add_custom_command(OUTPUT ${engine_sources}
COMMAND "${EXECUTABLE_OUTPUT_PATH}/pas2c${CMAKE_EXECUTABLE_SUFFIX}"
ARGS ${pas2c_args}
DEPENDS pas2c #converter tool
${engine_sources_pas} #original pascal file
)
#wrap conversion for all source in this command
add_custom_target(engine_c DEPENDS ${engine_sources})
if(BUILD_ENGINE_JS)
add_flag_append(CMAKE_C_FLAGS "--memory-init-file 0 -O0 --js-opts 0 -g4 --use-preload-plugins -s ASSERTIONS=2 -s USE_SDL=2 -s USE_SDL_IMAGE=1 -s USE_LIBPNG=1 -s USE_SDL_TTF=2 -s USE_VORBIS=1 -s USE_OGG=1 -s TOTAL_MEMORY=100000000 -s GL_UNSAFE_OPTS=0 -s EXPORTED_FUNCTIONS=\"['_hwengine_RunEngine', '_hwengine_MainLoop']\" --post-js ${CMAKE_SOURCE_DIR}/project_files/web/post.js --pre-js ${CMAKE_SOURCE_DIR}/project_files/web/pre.js")
endif()
#compile the c files
add_definitions(-DPAS2C)
add_definitions(-Werror=incompatible-pointer-types)
add_executable(hwengine WIN32 ${engine_sources})
if(BUILD_ENGINE_JS)
set_target_properties(hwengine PROPERTIES SUFFIX ".html")
endif()
target_link_libraries(hwengine fpcrtl
${LUA_LIBRARY}
${OPENGL_LIBRARY}
${SDL2_LIBRARIES}
${SDL2_MIXER_LIBRARIES}
${SDL2_NET_LIBRARIES}
${SDL2_IMAGE_LIBRARIES}
${SDL2_TTF_LIBRARIES}
physfs
physlayer
m
${HW_LINK_LIBS}
#TODO: add other libraries
)
install(PROGRAMS "${EXECUTABLE_OUTPUT_PATH}/hwengine${CMAKE_EXECUTABLE_SUFFIX}" DESTINATION ${target_binary_install_dir})