CMakeLists.txt

cmake_minimum_required(VERSION 3.16)
project(VoxelEngine)

set(CMAKE_CXX_STANDARD 17)
set(CMAKE_CXX_STANDARD_REQUIRED ON)

# Export compile commands for SonarQube
set(CMAKE_EXPORT_COMPILE_COMMANDS ON)

# If using submodule or system GLM
set(GLM_DIR ${CMAKE_SOURCE_DIR}/external/glm)
include_directories(${GLM_DIR})

set(OpenGL_GL_PREFERENCE GLVND)

find_package(OpenGL REQUIRED)
if (NOT OPENGL_FOUND)
    message(FATAL_ERROR "OpenGL not found. Please install OpenGL package.")
endif()

# WINDOW SPECIFIC
if(WIN32)
    set(GLFW_DIR ${CMAKE_SOURCE_DIR}/external/glfw)
    set(GLFW_INCLUDE_DIR ${GLFW_DIR}/include)
    set(GLFW_LIBRARY ${GLFW_DIR}/lib-vc2022/glfw3.lib)

    include_directories(${GLFW_INCLUDE_DIR})
    link_directories(${GLFW_DIR}/lib-vc2022)
else()
    find_package(glfw3 REQUIRED)
    if(NOT glfw3_FOUND)
        message(FATAL_ERROR "GLFW not found. Please install libglfw3 and libglfw3-dev packages.")
    endif()
endif()

# Add GLAD
add_library(glad STATIC
    external/glad/src/glad.c
)
target_include_directories(glad PUBLIC
    external/glad/include
)

if(WIN32)
    # Set Lua paths manually if using local installation
    set(LUA_DIR ${CMAKE_SOURCE_DIR}/external/lua)
    set(LUA_INCLUDE_DIR ${LUA_DIR}/include)
    
    # Create an imported library for Lua DLL
    add_library(lua54 SHARED IMPORTED)
    set_target_properties(lua54 PROPERTIES
        IMPORTED_IMPLIB "${LUA_DIR}/lua54.lib"
        IMPORTED_LOCATION "${LUA_DIR}/lua54.dll"
    )
    
    # Add the include directory
    include_directories(${LUA_INCLUDE_DIR})
    
    # Update LUA_LIBRARIES to use our imported target
    set(LUA_LIBRARIES lua54)
else()
    find_package(Lua 5.4 REQUIRED)
    if(NOT LUA_FOUND)
        message(FATAL_ERROR "Lua >= 5.4 not found. Please install lua5.4 and lua5.4-dev packages.")
    endif()
endif()

# Add ImGui source files
set(IMGUI_DIR external/imgui)
set(IMGUI_SOURCES
    ${IMGUI_DIR}/imgui.cpp
    ${IMGUI_DIR}/imgui_demo.cpp
    ${IMGUI_DIR}/imgui_draw.cpp
    ${IMGUI_DIR}/imgui_tables.cpp
    ${IMGUI_DIR}/imgui_widgets.cpp
    ${IMGUI_DIR}/backends/imgui_impl_glfw.cpp
    ${IMGUI_DIR}/backends/imgui_impl_opengl3.cpp
)

# Engine library sources
set(ENGINE_SOURCES
    src/pch.cpp
    src/Application.cpp
    src/Window/OpenGLWindow.cpp
    src/Renderer/Buffer.cpp
    src/Renderer/OpenGLBuffer.cpp
    src/Renderer/Renderer.cpp
    src/Renderer/Renderer2D.cpp
    src/Shader/Shader.cpp
    src/ImGui/ImGuiLayer.cpp
    src/Renderer/VertexArray.cpp
    src/Renderer/OpenGLVertexArray.cpp
    src/Camera/PerspectiveCamera.cpp
    src/Renderer/Material.cpp
    src/Renderer/Texture.cpp
    src/Debug/Profiler.cpp
    src/Threading/ThreadPool.cpp
    src/VoxelTerrain.cpp
    src/Noise/VoidNoise/VoidNoise.cpp
    src/Noise/PerlinNoise/PerlinNoise.cpp
    src/Input/InputSystem.cpp
    src/TerrainSystem/TerrainSystem.cpp
    src/UI/ImGuiOverlay.cpp
    src/UI/ImGuiFlameGraph.cpp
    src/VoxelChunk.cpp
    src/Core/FPSCounter.cpp
    src/Shader/ShaderHotReload.cpp
    src/Noise/SimplexNoise/SimplexNoise.cpp
    src/Noise/ValueNoise/ValueNoise.cpp
    external/stb_image/src/stb_image.cpp
    src/Scripting/LuaScriptSystem.cpp
    src/Scene/Scene.cpp
    src/Shader/ShaderLibrary.cpp
    src/Shader/ShaderFactory.cpp
    ${IMGUI_SOURCES}
)

# Create engine library
add_library(voxel-engine STATIC ${ENGINE_SOURCES})

target_include_directories(voxel-engine PUBLIC
    ${CMAKE_SOURCE_DIR}/src
    ${IMGUI_DIR}
    ${IMGUI_DIR}/backends
    ${CMAKE_SOURCE_DIR}/build/vcpkg_installed/x86-windows/include
    ${CMAKE_SOURCE_DIR}/external/stb_image/src
    ${CMAKE_SOURCE_DIR}/external/json
    ${CMAKE_SOURCE_DIR}/external/glad/include
    ${CMAKE_SOURCE_DIR}/build/vcpkg_installed/x86-windows/include
    ${CMAKE_SOURCE_DIR}/external/sol2
)

# Required for Github Actions
if(NOT WIN32)
    target_include_directories(voxel-engine PRIVATE /usr/include/lua5.4)
endif()

target_link_libraries(voxel-engine PUBLIC 
    $<IF:$<BOOL:${WIN32}>,${GLFW_LIBRARY},glfw>
    OpenGL::GL
    glad
    ${LUA_LIBRARIES}
)

# Create sandbox executable
set(SANDBOX_SOURCES
    sandbox/src/SandboxApp.cpp
)

add_executable(sandbox ${SANDBOX_SOURCES})
target_link_libraries(sandbox PRIVATE voxel-engine)

# Copy DLLs and assets after targets are created
if(WIN32)
    add_custom_command(TARGET sandbox POST_BUILD
        COMMAND ${CMAKE_COMMAND} -E copy_if_different
        "${LUA_DIR}/lua54.dll"
        $<TARGET_FILE_DIR:sandbox>
    )
endif()

if(MSVC)
    # Enable Edit and Continue for Debug builds
    string(REPLACE "/Zi" "/ZI" CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG}")
    
    # Or alternatively, you can add it directly:
    set(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} /ZI")
endif()

# Required for Github Actions
if(NOT WIN32)
    target_include_directories(sandbox PRIVATE /usr/include/lua5.4)
endif()

add_custom_command(TARGET sandbox POST_BUILD
    COMMAND ${CMAKE_COMMAND} -E copy_directory
    ${CMAKE_SOURCE_DIR}/sandbox/assets/scripts
    ${CMAKE_BINARY_DIR}/assets/scripts
)

add_custom_command(TARGET sandbox POST_BUILD
    COMMAND ${CMAKE_COMMAND} -E copy_directory
    ${CMAKE_SOURCE_DIR}/assets $<TARGET_FILE_DIR:sandbox>/assets
)