# WebGPU implementation configuration
# This file handles the integration of either Dawn or wgpu

set(MLN_WEBGPU_IMPL_DAWN OFF CACHE STRING "WebGPU with Dawn implementation")
set(MLN_WEBGPU_IMPL_WGPU OFF CACHE STRING "WebGPU with wgpu implementation")
set(MLN_WEBGPU_EMDAWN OFF
    CACHE BOOL "Use Emscripten emdawnwebgpu with Dawn headers (requires MLN_WEBGPU_IMPL_DAWN)")
set(MLN_WEBGPU_IMPL_FFI OFF CACHE STRING "WebGPU with ffi interface")
set(MLN_WEBGPU_IMPL_WEBGPU_HEADER_DIR "" CACHE STRING "If not empty use this path to the webgpu.h file")

if(MLN_WITH_WEBGPU)
    if(MLN_WEBGPU_EMDAWN AND NOT EMSCRIPTEN)
        message(FATAL_ERROR "MLN_WEBGPU_EMDAWN requires Emscripten")
    endif()

    if(MLN_WEBGPU_EMDAWN AND NOT MLN_WEBGPU_IMPL_DAWN)
        message(FATAL_ERROR "MLN_WEBGPU_EMDAWN requires MLN_WEBGPU_IMPL_DAWN")
    endif()

    if(MLN_WEBGPU_IMPL_DAWN)
        message(STATUS "Using Dawn as WebGPU backend")
        target_compile_definitions(mbgl-core PUBLIC MLN_WEBGPU_IMPL_DAWN)
        if(MLN_WEBGPU_EMDAWN)
            message(STATUS "Using emdawnwebgpu port for browser WebGPU")
            target_compile_definitions(mbgl-core PUBLIC MLN_WEBGPU_EMDAWN)
        endif()

    elseif(MLN_WEBGPU_IMPL_WGPU)
        message(STATUS "Using wgpu as WebGPU backend")
        target_compile_definitions(mbgl-core PUBLIC MLN_WEBGPU_IMPL_WGPU)
    else()
        message(FATAL_ERROR "MLN_WEBGPU_IMPL_DAWN or MLN_WEBGPU_IMPL_WGPU must be set")
    endif()

    if(MLN_WEBGPU_IMPL_FFI)
        target_compile_definitions(mbgl-core PUBLIC MLN_WEBGPU_IMPL_FFI)
    endif()
endif()