cmake_minimum_required(VERSION 3.22)
project(webgpu-engine)
set(CMAKE_CXX_STANDARD 20)

# Compile commands for dev
set(CMAKE_EXPORT_COMPILE_COMMANDS ON CACHE INTERNAL "")
if(CMAKE_EXPORT_COMPILE_COMMANDS)
  set(CMAKE_C_STANDARD_INCLUDE_DIRECTORIES
    ${CMAKE_C_IMPLICIT_INCLUDE_DIRECTORIES})
endif()

add_executable(${PROJECT_NAME})

# Error on memory address issues in debug mode
if(CMAKE_BUILD_TYPE MATCHES "Debug")
  set(CMAKE_CXX_FLAGS
    "${CMAKE_CXX_FLAGS} -Werror -fsanitize=undefined -fsanitize=address"
  )
  target_link_options(${PROJECT_NAME}
    BEFORE PUBLIC -fsanitize=undefined PUBLIC -fsanitize=address
  )
endif()

# Dawn library setup 
find_package(Threads REQUIRED)
find_package(Dawn)

if (NOT Dawn_FOUND) 
  if(CMAKE_BUILD_TYPE MATCHES "Debug") 
    set(DAWN_BUILD_MONOLITHIC_LIBRARY "SHARED")
  endif()
  set(DAWN_FETCH_DEPENDENCIES ON CACHE BOOL "" FORCE)
  
  # Prevent Dawn from building excessive tools/samples to save compile time
  set(DAWN_BUILD_SAMPLES OFF CACHE BOOL "" FORCE)
  set(DAWN_ENABLE_INSTALL OFF CACHE BOOL "" FORCE)
  
  add_subdirectory("extern/dawn" EXCLUDE_FROM_ALL)

  set(DAWN_LINK_TARGET webgpu_dawn)
else()
  set(DAWN_LINK_TARGET dawn::webgpu_dawn)
endif()



# Find SDL3 Packages
find_package(SDL3 REQUIRED)
find_package(SDL3_image REQUIRED)
set(SDL3_image_LIBRARIES SDL3_image::SDL3_image)

# Force the 'webgpu' dependency expected by sdl3webgpu to point to Dawn instead
if(NOT TARGET webgpu)
    add_library(webgpu ALIAS ${DAWN_LINK_TARGET})
endif()

# Configure and include sdl3webgpu 
add_subdirectory(extern/sdl3webgpu)

# Include directories
target_include_directories(${PROJECT_NAME} PUBLIC 
  $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/include/>
  $<INSTALL_INTERFACE:include/>
  ${SDL3_INCLUDE_DIRS}
  ${SDL3_image_INCLUDE_DIRS}
)

file(GLOB_RECURSE SOURCE_FILES ${CMAKE_SOURCE_DIR}/src/*.cpp)
target_sources(${PROJECT_NAME} PRIVATE ${SOURCE_FILES})


# Linking Layer
if(EMSCRIPTEN) 
  # Note: your target is ${PROJECT_NAME}, updated 'app' references to match
  set_target_properties(${PROJECT_NAME} PROPERTIES SUFFIX ".html")
  target_link_libraries(${PROJECT_NAME} PRIVATE emdawnwebgpu_cpp webgpu_glfw)
  target_link_options(${PROJECT_NAME} PRIVATE "-sASYNCIFY=1" "-sUSE_GLFW=3")
else()
  target_link_libraries(${PROJECT_NAME} PRIVATE 
    ${DAWN_LINK_TARGET}
    sdl3webgpu
    SDL3::SDL3
    ${SDL3_image_LIBRARIES}
  )
endif()