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project(
  'imgui',
  'cpp',
  license: 'MIT',
  version: 'PV',
  meson_version: '>=0.50.0',
)

if host_machine.system() == 'darwin'
  add_languages('objcpp')
endif

include_dirs = include_directories('.', 'backends')
sources = files(
  'misc/cpp/imgui_stdlib.cpp',
  'imgui.cpp',
  'imgui_demo.cpp',
  'imgui_draw.cpp',
  'imgui_tables.cpp',
  'imgui_widgets.cpp',
)

headers = files()

cpp = meson.get_compiler('cpp')
dependencies = []

# renderer backends
dependencies += cpp.find_library('d3dcompiler', required: host_machine.system() == 'windows')
dx9_dep = cpp.find_library('d3d9', required: get_option('dx9'))
if dx9_dep.found()
  sources += 'backends/imgui_impl_dx9.cpp'
  dependencies += dx9_dep
  headers += files('backends/imgui_impl_dx9.h')
endif
dx10_dep = cpp.find_library('d3d10', required: get_option('dx10'))
if dx10_dep.found()
  sources += 'backends/imgui_impl_dx10.cpp'
  dependencies += dx10_dep
  headers += files('backends/imgui_impl_dx10.h')
endif
dx11_dep = cpp.find_library('d3d11', required: get_option('dx11'))
if dx11_dep.found()
  sources += 'backends/imgui_impl_dx11.cpp'
  dependencies += dx11_dep
  headers += files('backends/imgui_impl_dx11.h')
endif
dx12_dep = cpp.find_library('d3d12', required: get_option('dx12'))
# MinGW does not work. See https://github.com/ocornut/imgui/pull/4604
if dx12_dep.found() and cpp.get_argument_syntax() == 'msvc'
  sources += 'backends/imgui_impl_dx12.cpp'
  dependencies += dx12_dep
  headers += files('backends/imgui_impl_dx12.h')
endif
metal_dep = dependency('appleframeworks', modules: ['Foundation', 'AppKit', 'GameController', 'Metal'], required: get_option('metal'))
if metal_dep.found()
  sources += 'backends/imgui_impl_metal.mm'
  dependencies += metal_dep
  headers += files('backends/imgui_impl_metal.h')
endif
libgl_dep = dependency('gl', required: get_option('opengl'))
opengl_src = files(
  'backends/imgui_impl_opengl2.cpp',
  'backends/imgui_impl_opengl3.cpp')
if libgl_dep.found()
  sources += opengl_src
  dependencies += libgl_dep
  dependencies += cpp.find_library('dl', required: false)
  headers = files('backends/imgui_impl_opengl2.h', 
    'backends/imgui_impl_opengl3.h', 
    'backends/imgui_impl_opengl3_loader.h')
endif
sdl2_renderer_dep = dependency('sdl2', version: '>=2.0.17', required: get_option('sdl2_renderer'))
if sdl2_renderer_dep.found()
  sources += 'backends/imgui_impl_sdlrenderer2.cpp'
  dependencies += sdl2_renderer_dep
  headers += files('backends/imgui_impl_sdlrenderer2.h')
endif
sdl3_renderer_dep = dependency('sdl3', version: '>=3.0.0', required: get_option('sdl3_renderer'))
if sdl3_renderer_dep.found()
  sources += 'backends/imgui_impl_sdlrenderer3.cpp'
  dependencies += sdl3_renderer_dep
  headers += files('backends/imgui_impl_sdlrenderer3.h')
endif
vulkan_dep = dependency('vulkan', required: get_option('vulkan'))
if vulkan_dep.found()
  sources += 'backends/imgui_impl_vulkan.cpp'
  dependencies += vulkan_dep
  headers += files('backends/imgui_impl_vulkan.h')
endif
if cpp.has_header('webgpu/webgpu.h', required: get_option('webgpu'))
  sources += 'backends/imgui_impl_wgpu.cpp'
  headers += files('backends/imgui_impl_wgpu.h')
endif

# platform backends
glfw_dep = dependency('glfw3', required: get_option('glfw'))
if glfw_dep.found()
  sources += 'backends/imgui_impl_glfw.cpp'
  dependencies += glfw_dep
  headers += files('backends/imgui_impl_glfw.h')
endif
sdl2_dep = dependency('sdl2', required: get_option('sdl2'))
if sdl2_dep.found()
  sources += 'backends/imgui_impl_sdl2.cpp'
  dependencies += sdl2_dep
  headers += files('backends/imgui_impl_sdl2.h')
endif
sdl3_dep = dependency('sdl3', required: get_option('sdl3'))
if sdl3_dep.found()
  sources += 'backends/imgui_impl_sdl3.cpp'
  dependencies += sdl3_dep
  headers += files('backends/imgui_impl_sdl3.h')
endif
osx_dep = dependency('appleframeworks', modules: ['Carbon', 'Cocoa', 'GameController'], required: get_option('osx'))
if osx_dep.found()
  sources += 'backends/imgui_impl_osx.mm'
  headers += files('backends/imgui_impl_osx.h')
endif
win_dep = cpp.find_library('dwmapi', required: get_option('win'))
if win_dep.found()
  sources += 'backends/imgui_impl_win32.cpp'
  dependencies += win_dep
  headers += files('backends/imgui_impl_win32.h')
endif

# frameworks
allegro5_dep = dependency('allegro-5', required: get_option('allegro5'))
allegro5_primitives_dep = dependency('allegro_primitives-5', required: get_option('allegro5'))
if allegro5_dep.found() and allegro5_primitives_dep.found()
  sources += 'backends/imgui_impl_allegro5.cpp'
  dependencies += [allegro5_dep, allegro5_primitives_dep]
  headers+= files('backends/imgui_impl_allegro5.h')
endif

api = '-DIMGUI_API=__attribute__((visibility("default")))'
if host_machine.system() == 'windows'
  api = '-DIMGUI_API=@0@'.format(get_option('default_library') != 'static' ? '__declspec(dllexport)' : '')
endif

imgui = library(
  'imgui',
  sources,
  cpp_args: api,
  gnu_symbol_visibility: 'hidden',
  dependencies: dependencies,
  include_directories: include_dirs,
  version: meson.project_version(),
  install: true
)

headers += files(
    'imconfig.h',
    'imgui.h',
    'imgui_internal.h',
    'imstb_rectpack.h',
    'imstb_textedit.h',
    'imstb_truetype.h',)
headers_subdir = 'imgui'

install_headers(headers, subdir: headers_subdir)

pkg_mod = import('pkgconfig')
pkg_mod.generate(imgui,
  description : 'Dear ImGui: Bloat-free Graphical User interface for C++ with minimal dependencies',
  subdirs : headers_subdir
)

if host_machine.system() == 'windows'
  api = '-DIMGUI_API=@0@'.format(get_option('default_library') != 'static' ? '__declspec(dllimport)' : '')
endif

imgui_dep = declare_dependency(
  compile_args: api,
  include_directories: include_dirs,
  link_with: imgui,
)