cmake_minimum_required(VERSION 3.20)
project(hd2d LANGUAGES C CXX)

set(CMAKE_CXX_STANDARD 20)
set(CMAKE_CXX_STANDARD_REQUIRED ON)
set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
if(NOT CMAKE_BUILD_TYPE AND NOT CMAKE_CONFIGURATION_TYPES)
  set(CMAKE_BUILD_TYPE RelWithDebInfo CACHE STRING "" FORCE)
endif()

include(FetchContent)

# --- Dependencies -----------------------------------------------------------
# System packages are preferred; anything missing is fetched.
find_package(OpenGL REQUIRED)
find_package(PkgConfig REQUIRED)
pkg_check_modules(EPOXY REQUIRED IMPORTED_TARGET epoxy)

find_package(glfw3 3.3 QUIET)
if(NOT glfw3_FOUND)
  set(GLFW_BUILD_DOCS OFF CACHE BOOL "" FORCE)
  set(GLFW_BUILD_TESTS OFF CACHE BOOL "" FORCE)
  set(GLFW_BUILD_EXAMPLES OFF CACHE BOOL "" FORCE)
  FetchContent_Declare(glfw GIT_REPOSITORY https://github.com/glfw/glfw.git GIT_TAG 3.4)
  FetchContent_MakeAvailable(glfw)
endif()

find_package(glm QUIET)
if(NOT glm_FOUND)
  FetchContent_Declare(glm GIT_REPOSITORY https://github.com/g-truc/glm.git GIT_TAG 1.0.1)
  FetchContent_MakeAvailable(glm)
endif()

find_path(STB_INCLUDE_DIR stb_image.h PATH_SUFFIXES stb)
if(NOT STB_INCLUDE_DIR)
  FetchContent_Declare(stb GIT_REPOSITORY https://github.com/nothings/stb.git GIT_TAG master)
  FetchContent_MakeAvailable(stb)
  set(STB_INCLUDE_DIR ${stb_SOURCE_DIR})
endif()

find_path(CGLTF_INCLUDE_DIR cgltf.h)
if(NOT CGLTF_INCLUDE_DIR)
  FetchContent_Declare(cgltf GIT_REPOSITORY https://github.com/jkuhlmann/cgltf.git GIT_TAG v1.14)
  FetchContent_MakeAvailable(cgltf)
  set(CGLTF_INCLUDE_DIR ${cgltf_SOURCE_DIR})
endif()

FetchContent_Declare(imgui GIT_REPOSITORY https://github.com/ocornut/imgui.git GIT_TAG v1.91.9b)
FetchContent_MakeAvailable(imgui)
add_library(imgui STATIC
  ${imgui_SOURCE_DIR}/imgui.cpp
  ${imgui_SOURCE_DIR}/imgui_draw.cpp
  ${imgui_SOURCE_DIR}/imgui_tables.cpp
  ${imgui_SOURCE_DIR}/imgui_widgets.cpp
  ${imgui_SOURCE_DIR}/backends/imgui_impl_glfw.cpp
  ${imgui_SOURCE_DIR}/backends/imgui_impl_opengl3.cpp)
target_include_directories(imgui PUBLIC ${imgui_SOURCE_DIR} ${imgui_SOURCE_DIR}/backends)
target_link_libraries(imgui PUBLIC glfw OpenGL::GL)

# --- Engine -----------------------------------------------------------------
file(GLOB_RECURSE HD2D_ENGINE_SOURCES CONFIGURE_DEPENDS engine/src/*.cpp)
add_library(hd2d STATIC ${HD2D_ENGINE_SOURCES})
target_include_directories(hd2d PUBLIC engine/include)
target_include_directories(hd2d SYSTEM PRIVATE ${STB_INCLUDE_DIR} ${CGLTF_INCLUDE_DIR})  # silence third-party warnings
target_link_libraries(hd2d PUBLIC glfw glm::glm PkgConfig::EPOXY imgui OpenGL::GL)
target_compile_definitions(hd2d PUBLIC GLM_FORCE_RADIANS GLM_ENABLE_EXPERIMENTAL)
if(MSVC)
  target_compile_options(hd2d PRIVATE /W4)
else()
  target_compile_options(hd2d PRIVATE -Wall -Wextra -Wno-unused-parameter)
endif()

# --- Demo -------------------------------------------------------------------
add_executable(hd2d_demo demo/main.cpp demo/DemoScene.cpp)
target_link_libraries(hd2d_demo PRIVATE hd2d)
# Assets/shaders are loaded relative to this directory at runtime.
target_compile_definitions(hd2d_demo PRIVATE HD2D_ASSET_DIR="${CMAKE_SOURCE_DIR}/assets")