cmake_minimum_required(VERSION 3.25 FATAL_ERROR)
project(webgpu
    VERSION 0
    DESCRIPTION "Simple Engine Experiment in C"
    HOMEPAGE_URL "https://git.warwick-new.co.uk/"
    LANGUAGES C
)

set(CMAKE_C_STANDARD 17)

# Since nix include dirs isn't appearing in compile_commands.json we're gonna 
# force cmake to link it's includes more explicitly
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()

option(USE_VENDORED_LIBRARIES "Use vendored libraries" ON)

if(USE_VENDORED_LIBRARIES)
  set(OpenGL_GL_PREFERENCE GLVND)

  add_definitions(-DSDL_STATIC=ON)
  add_subdirectory(extern/SDL3 EXCLUDE_FROM_ALL)
  set(SDL3_LIBRARIES SDL3::SDL3)
  set(SDL3_INCLUDE_DIRS ${SDL3_SOURCE_DIR}/include)
  set(SDL3_image_INCLUDE_DIRS ${SDL3_IMAGE_SOURCE_DIR}/include)

  add_subdirectory(extern/SDL3_image)
  set(SDL3_image_LIBRARIES SDL3_image::SDL3_image)

  add_subdirectory(extern/cglm)
  set(CGLM_LIBRARIES cglm)
  set(CGLM_INCLUDE_DIRS ${CMAKE_SOURCE_DIR}/extern/cglm/include)

  include(FetchContent)
  set(BUILD_UTILS OFF CACHE INTERNAL "")
  set(BUILD_SHARED_LIBS OFF CACHE INTERNAL "")
  add_definitions(-DGLEW_STATIC)
  cmake_policy(SET CMP0135 NEW) #DOWNLOAD_EXTRACT_TIMESTAMP
  FetchContent_Declare(
    glew
    URL https://github.com/nigels-com/glew/releases/download/glew-2.2.0/glew-2.2.0.tgz
    SOURCE_SUBDIR  build/cmake
  )
  FetchContent_MakeAvailable(glew)
  set(GLEW_LIBRARIES glew_s)
  set(GLEW_INCLUDE_DIRS ${glew_SOURCE_DIR}/include)


  find_package(OpenGL REQUIRED)
  set(OPENGL_LIBRARIES ${OPENGL_gl_LIBRARY})
  set(OPENGL_INCLUDE_DIRS ${OPENGL_INCLUDE_DIR})
else()
  find_package(SDL3 REQUIRED CONFIG REQUIRED COMPONENTS SDL3-shared)
endif()

#get_cmake_property(_variableNames VARIABLES)
#list (SORT _variableNames)
#foreach (_variableName ${_variableNames})
#    message(STATUS "${_variableName}=${${_variableName}}")
#endforeach()

file(GLOB_RECURSE SOURCE_FILES
    ${CMAKE_SOURCE_DIR}/src/*.c)
file(GLOB_RECURSE HEADER_FILES
    ${CMAKE_SOURCE_DIR}/src/*.h)
add_executable(${PROJECT_NAME} ${HEADER_FILES} ${SOURCE_FILES})

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

target_include_directories(${PROJECT_NAME} PRIVATE
    ${SDL3_INCLUDE_DIRS}
    ${SDL3_image_INCLUDE_DIRS}
    ${CGLM_INCLUDE_DIRS}
    ${GLEW_INCLUDE_DIRS}
    ${OPENGL_INCLUDE_DIRS}
)

target_link_libraries(${PROJECT_NAME} PRIVATE
    ${SDL3_LIBRARIES}
    ${SDL3_image_LIBRARIES}
    ${CGLM_LIBRARIES}
    ${GLEW_LIBRARIES}
    ${OPENGL_LIBRARIES}
)