CMakeLists.txt

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

set(CMAKE_CXX_STANDARD 26)
set(CMAKE_EXPORT_COMPILE_COMMANDS ON)

# Enforce no exceptions and no RTTI as per requirements
add_compile_options(-fno-exceptions -fno-rtti)

# Find ZLIB for parsing compressed M3G headers
find_package(ZLIB REQUIRED)
find_package(Eigen3 REQUIRED)

find_package(SDL3 REQUIRED)
find_package(Vulkan REQUIRED)
find_program(GLSLANG_VALIDATOR glslangValidator REQUIRED)

set(SHADER_SOURCE_DIR ${CMAKE_CURRENT_SOURCE_DIR}/src/shaders)
set(SHADER_BINARY_DIR ${CMAKE_CURRENT_BINARY_DIR}/shaders)
file(MAKE_DIRECTORY ${SHADER_BINARY_DIR})

set(SHADER_SOURCES
    ${SHADER_SOURCE_DIR}/flat_color.vert
    ${SHADER_SOURCE_DIR}/flat_color.frag
)

set(SHADER_OUTPUTS)
foreach(SHADER ${SHADER_SOURCES})
    get_filename_component(SHADER_NAME ${SHADER} NAME)
    set(SHADER_OUTPUT ${SHADER_BINARY_DIR}/${SHADER_NAME}.spv)
    add_custom_command(
        OUTPUT ${SHADER_OUTPUT}
        COMMAND ${GLSLANG_VALIDATOR} -V ${SHADER} -o ${SHADER_OUTPUT}
        DEPENDS ${SHADER}
        COMMENT "Compiling shader ${SHADER_NAME}"
        VERBATIM
    )
    list(APPEND SHADER_OUTPUTS ${SHADER_OUTPUT})
endforeach()

add_custom_target(m3g_engine_shaders ALL DEPENDS ${SHADER_OUTPUTS})

# Define pure C++ executable
add_executable(m3g_engine 
    src/main.cpp
    src/engine.cpp
    src/m3g_parser.cpp
    src/vulkan_renderer.cpp
)

add_dependencies(m3g_engine m3g_engine_shaders)

target_include_directories(m3g_engine PRIVATE src)
target_compile_definitions(m3g_engine PRIVATE M3G_SHADER_DIR="${SHADER_BINARY_DIR}")
target_link_libraries(m3g_engine PRIVATE 
    ZLIB::ZLIB 
    Eigen3::Eigen
    SDL3::SDL3-shared
    Vulkan::Vulkan
)