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# Building for desktop (WebGPU-native) with Dawn:
# 1. git clone https://github.com/google/dawn dawn
# 2. cmake -B build -DIMGUI_DAWN_DIR=dawn
# 3. cmake --build build
# The resulting binary will be found at one of the following locations:
# * build/Debug/example_glfw_wgpu[.exe]
# * build/example_glfw_wgpu[.exe]
# Building for desktop (WGPU-Native) with WGPU-Native:
# 1. download WGPU-Native autogenerated binary modules for your platform/compiler from: https://github.com/gfx-rs/wgpu-native/releases
# 2. unzip the downloaded file in your_preferred_folder
# 3. cmake -B build -DIMGUI_WGPU_DIR=your_preferred_folder ("full path" or "relative" starting from current directory)
# 4. cmake --build build
# The resulting binary will be found at one of the following locations:
# * build/Debug/example_glfw_wgpu[.exe]
# * build/example_glfw_wgpu[.exe]
# Building for Emscripten:
# 1. Install Emscripten SDK following the instructions: https://emscripten.org/docs/getting_started/downloads.html
# 2. Install Ninja build system
# 3. emcmake cmake -G Ninja -B build
# (optional) -DIMGUI_EMSCRIPTEN_WEBGPU_FLAG="--use-port=path/to/emdawnwebgpu_package/emdawnwebgpu.port.py", see ReadMe.md
# 3. cmake --build build
# 4. emrun build/index.html
cmake_minimum_required(VERSION 3.22) # Dawn requires CMake >= 3.22
project(imgui_example_glfw_wgpu C CXX)
set(IMGUI_EXECUTABLE example_glfw_wgpu)
if(NOT CMAKE_BUILD_TYPE)
set(CMAKE_BUILD_TYPE Debug CACHE STRING "" FORCE)
endif()
set(CMAKE_CXX_STANDARD 17) # Dawn requires C++17
# Dear ImGui
set(IMGUI_DIR ../../)
set(IMGUI_EXAMPLE_SOURCE_FILES
# Example code
main.cpp
# Dear ImGui Backend files
${IMGUI_DIR}/backends/imgui_impl_glfw.cpp
${IMGUI_DIR}/backends/imgui_impl_wgpu.cpp
# Dear ImGui files
${IMGUI_DIR}/imgui.cpp
${IMGUI_DIR}/imgui_draw.cpp
${IMGUI_DIR}/imgui_demo.cpp
${IMGUI_DIR}/imgui_tables.cpp
${IMGUI_DIR}/imgui_widgets.cpp
)
if(EMSCRIPTEN)
if(NOT IMGUI_EMSCRIPTEN_WEBGPU_FLAG) # if IMGUI_EMSCRIPTEN_WEBGPU_FLAG not used, set by current EMSCRIPTEN version
if(EMSCRIPTEN_VERSION VERSION_GREATER_EQUAL "4.0.10")
set(IMGUI_EMSCRIPTEN_WEBGPU_FLAG "--use-port=emdawnwebgpu" CACHE STRING "Choose between --use-port=emdawnwebgpu (Dawn implementation of EMSCRIPTEN) and -sUSE_WEBGPU=1 (WGPU implementation of EMSCRIPTEN, deprecated in 4.0.10): default to --use-port=emdawnwebgpu for EMSCRIPTEN >= 4.0.10")
else()
set(IMGUI_EMSCRIPTEN_WEBGPU_FLAG "-sUSE_WEBGPU=1" CACHE STRING "Use -sUSE_WEBGPU=1 for EMSCRIPTEN WGPU implementation")
endif()
else() # if IMGUI_EMSCRIPTEN_WEBGPU_FLAG used, check correct version
if(EMSCRIPTEN_VERSION VERSION_LESS "4.0.10" AND "${IMGUI_EMSCRIPTEN_WEBGPU_FLAG}" MATCHES "emdawnwebgpu")
# it's necessary EMSCRIPTEN >= v4.0.10 (although "--use-port=path/to/emdawnwebgpu.port.py" is supported/tested from v4.0.8)
message(FATAL_ERROR "emdawnwebgpu needs EMSCRIPTEN version >= 4.0.10")
endif()
endif()
if(EMSCRIPTEN_VERSION VERSION_GREATER_EQUAL "3.1.57")
set(IMGUI_EMSCRIPTEN_GLFW3 "--use-port=contrib.glfw3" CACHE STRING "Choose between --use-port=contrib.glfw3 and -sUSE_GLFW=3 for GLFW implementation (default to --use-port=contrib.glfw3)")
else() # cannot use contrib.glfw3 prior to 3.1.57
set(IMGUI_EMSCRIPTEN_GLFW3 "-sUSE_GLFW=3" CACHE STRING "Use -sUSE_GLFW=3 for GLFW implementation" FORCE)
endif()
set(LIBRARIES glfw)
add_compile_options(-sDISABLE_EXCEPTION_CATCHING=1 -DIMGUI_DISABLE_FILE_FUNCTIONS=1)
else() # Native/Desktop build
# Check DAWN/WGPU directory
if(NOT IMGUI_DAWN_DIR AND NOT IMGUI_WGPU_DIR) # if it's Native/Desktop build, IMGUI_DAWN_DIR or IMGUI_WGPU_DIR must be specified
message(FATAL_ERROR "Please specify the Dawn or WGPU base directory")
endif()
if(IMGUI_DAWN_DIR AND IMGUI_WGPU_DIR) # both IMGUI_DAWN_DIR and IMGUI_WGPU_DIR cannot be set
message(FATAL_ERROR "Please specify only one between Dawn / WGPU base directory")
endif()
if(APPLE) # Add SDL2 module to get Surface, with libs and file property for MacOS build
set_source_files_properties(${IMGUI_DIR}/backends/imgui_impl_wgpu.cpp PROPERTIES COMPILE_FLAGS "-x objective-c++")
set(OS_LIBRARIES "-framework CoreFoundation -framework QuartzCore -framework Metal -framework MetalKit -framework Cocoa")
endif()
find_package(glfw3 REQUIRED)
if(IMGUI_DAWN_DIR) # DAWN-Native build options
list(APPEND CMAKE_PREFIX_PATH ${IMGUI_DAWN_DIR})
find_package(Dawn) # Search for a Dawn installation using IMGUI_DAWN_DIR in CMAKE_PREFIX_PATH
if(Dawn_FOUND)
message("Dawn Installation has been found!")
set(LIBRARIES dawn::webgpu_dawn glfw ${OS_LIBRARIES})
else()
set(IMGUI_DAWN_DIR CACHE PATH "Path to Dawn repository")
option(DAWN_FETCH_DEPENDENCIES "Use fetch_dawn_dependencies.py as an alternative to using depot_tools" ON)
set(DAWN_BUILD_MONOLITHIC_LIBRARY "STATIC" CACHE STRING "Build monolithic library: SHARED, STATIC, or OFF.")
option(DAWN_USE_GLFW OFF) # disable buildin GLFW in DAWN when we use SDL2 / SDL3
# Dawn builds many things by default - disable things we don't need
option(DAWN_BUILD_SAMPLES "Enables building Dawn's samples" OFF)
option(TINT_BUILD_CMD_TOOLS "Build the Tint command line tools" OFF)
option(TINT_BUILD_DOCS "Build documentation" OFF)
option(TINT_BUILD_TESTS "Build tests" OFF)
if(NOT APPLE)
option(TINT_BUILD_MSL_WRITER "Build the MSL output writer" OFF)
endif()
if(WIN32)
option(DAWN_FORCE_SYSTEM_COMPONENT_LOAD "Allow system component fallback" ON)
option(TINT_BUILD_SPV_READER "Build the SPIR-V input reader" OFF)
option(TINT_BUILD_WGSL_READER "Build the WGSL input reader" ON)
option(TINT_BUILD_GLSL_WRITER "Build the GLSL output writer" OFF)
option(TINT_BUILD_GLSL_VALIDATOR "Build the GLSL output validator" OFF)
option(TINT_BUILD_SPV_WRITER "Build the SPIR-V output writer" ON)
option(TINT_BUILD_WGSL_WRITER "Build the WGSL output writer" ON)
endif()
# check if WAYLAND is the current Session Type and enable DAWN_USE_WAYLAND Wayland option @compile time
# You can override this using: cmake -DDAWN_USE_WAYLAND=X (X = ON | OFF)
if(LINUX)
if($ENV{XDG_SESSION_TYPE} MATCHES wayland)
option(DAWN_USE_WAYLAND "Enable support for Wayland surface" ON)
endif()
endif()
add_subdirectory("${IMGUI_DAWN_DIR}" "${CMAKE_CURRENT_BINARY_DIR}/dawn" EXCLUDE_FROM_ALL)
set(LIBRARIES webgpu_dawn glfw)
endif()
else() # WGPU-Native build options
set(WGPU_NATIVE_LIB_DIR ${IMGUI_WGPU_DIR}/lib)
find_library(WGPU_LIBRARY NAMES libwgpu_native.a wgpu_native.lib wgpu_native HINTS ${WGPU_NATIVE_LIB_DIR} REQUIRED)
if(WIN32)
set(OS_LIBRARIES d3dcompiler ws2_32 userenv bcrypt ntdll opengl32 Propsys RuntimeObject)
elseif(UNIX AND NOT APPLE)
set(OS_LIBRARIES "-lm -ldl")
endif()
set(LIBRARIES glfw ${WGPU_LIBRARY} ${OS_LIBRARIES})
endif()
endif()
add_executable(${IMGUI_EXECUTABLE} ${IMGUI_EXAMPLE_SOURCE_FILES})
target_include_directories(${IMGUI_EXECUTABLE} PUBLIC
${IMGUI_DIR}
${IMGUI_DIR}/backends
)
target_compile_definitions(${IMGUI_EXECUTABLE} PUBLIC "IMGUI_EXAMPLE_GLFW_WGPU")
# compiler option only for IMGUI_EXAMPLE_SOURCE_FILES
if (MSVC)
target_compile_options(${IMGUI_EXECUTABLE} PUBLIC /W4) # warning level 4
else()
target_compile_options(${IMGUI_EXECUTABLE} PUBLIC -Wall) # -Wextra -Wpedantic
endif()
# In this example IMGUI_IMPL_WEBGPU_BACKEND_DAWN / IMGUI_IMPL_WEBGPU_BACKEND_WGPU internal define is set according to:
# EMSCRIPTEN: by used FLAG
# --use-port=emdawnwebgpu --> IMGUI_IMPL_WEBGPU_BACKEND_DAWN defined
# -sUSE_WEBGPU=1 --> IMGUI_IMPL_WEBGPU_BACKEND_WGPU defined
# NATIVE: by used SDK installation directory
# if IMGUI_DAWN_DIR is valid --> IMGUI_IMPL_WEBGPU_BACKEND_DAWN defined
# if IMGUI_WGPU_DIR is valid --> IMGUI_IMPL_WEBGPU_BACKEND_WGPU defined
if(NOT EMSCRIPTEN) # WegGPU-Native settings
# Set IMGUI_IMPL_WEBGPU_BACKEND_XXXX based on the SDK (directory) used
if(IMGUI_DAWN_DIR)
target_compile_definitions(${IMGUI_EXECUTABLE} PUBLIC "IMGUI_IMPL_WEBGPU_BACKEND_DAWN")
if(NOT Dawn_FOUND)
target_link_libraries(${IMGUI_EXECUTABLE} INTERFACE webgpu_cpp)
endif()
else()
target_compile_definitions(${IMGUI_EXECUTABLE} PUBLIC "IMGUI_IMPL_WEBGPU_BACKEND_WGPU")
target_include_directories(${IMGUI_EXECUTABLE} PUBLIC ${IMGUI_WGPU_DIR}/include)
endif()
target_link_libraries(${IMGUI_EXECUTABLE} PUBLIC ${LIBRARIES})
else() # Emscripten settings
set(CMAKE_EXECUTABLE_SUFFIX ".html")
if("${IMGUI_EMSCRIPTEN_GLFW3}" STREQUAL "--use-port=contrib.glfw3")
target_compile_options(${IMGUI_EXECUTABLE} PUBLIC "${IMGUI_EMSCRIPTEN_GLFW3}")
endif()
message(STATUS "Using ${IMGUI_EMSCRIPTEN_GLFW3} GLFW implementation")
if("${IMGUI_EMSCRIPTEN_WEBGPU_FLAG}" MATCHES "emdawnwebgpu")
target_compile_options(${IMGUI_EXECUTABLE} PUBLIC "${IMGUI_EMSCRIPTEN_WEBGPU_FLAG}")
target_compile_definitions(${IMGUI_EXECUTABLE} PUBLIC "IMGUI_IMPL_WEBGPU_BACKEND_DAWN")
else()
target_compile_definitions(${IMGUI_EXECUTABLE} PUBLIC "IMGUI_IMPL_WEBGPU_BACKEND_WGPU")
endif()
message(STATUS "Using ${IMGUI_EMSCRIPTEN_WEBGPU_FLAG} WebGPU implementation")
target_link_options(${IMGUI_EXECUTABLE} PRIVATE
"${IMGUI_EMSCRIPTEN_WEBGPU_FLAG}"
"${IMGUI_EMSCRIPTEN_GLFW3}"
"-sWASM=1"
"-sASYNCIFY=1"
"-sALLOW_MEMORY_GROWTH=1"
"-sNO_EXIT_RUNTIME=0"
"-sASSERTIONS=1"
"-sDISABLE_EXCEPTION_CATCHING=1"
"-sNO_FILESYSTEM=1"
"--shell-file=${CMAKE_CURRENT_LIST_DIR}/../libs/emscripten/shell_minimal.html"
)
set_target_properties(${IMGUI_EXECUTABLE} PROPERTIES OUTPUT_NAME "index")
endif()
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