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examples/example_sdl2_cpu/README.md
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# How to Build
## Windows with Visual Studio's IDE
Use the provided project file (`example_sdl2_cpu.vcxproj`) or open `imgui_examples.sln`.
## Windows with Visual Studio's CLI
Use `build_win32.bat` or directly:
```
set SDL2_DIR=path_to_your_sdl2_folder
cl /Zi /MD /utf-8 /I.. /I..\.. /I%SDL2_DIR%\include main.cpp ..\..\backends\imgui_impl_sdl2.cpp ..\..\backends\imgui_impl_cpu.cpp ..\..\imgui*.cpp /FeDebug/example_sdl2_cpu.exe /FoDebug/ /link /libpath:%SDL2_DIR%\lib\x86 SDL2.lib SDL2main.lib /subsystem:console
# ^^ include paths ^^ source files ^^ output exe ^^ output dir ^^ libraries
# or for 64-bit:
cl /Zi /MD /utf-8 /I.. /I..\.. /I%SDL2_DIR%\include main.cpp ..\..\backends\imgui_impl_sdl2.cpp ..\..\backends\imgui_impl_cpu.cpp ..\..\imgui*.cpp /FeDebug/example_sdl2_cpu.exe /FoDebug/ /link /libpath:%SDL2_DIR%\lib\x64 SDL2.lib SDL2main.lib /subsystem:console
```
## Linux and similar Unixes
Use the provided `Makefile` or directly:
```
c++ `sdl2-config --cflags` -I .. -I ../.. -I ../../backends \
main.cpp ../../backends/imgui_impl_sdl2.cpp ../../backends/imgui_impl_cpu.cpp ../../imgui*.cpp \
`sdl2-config --libs`
```
## macOS
Use the provided `Makefile` or directly:
```
brew install sdl2
c++ `sdl2-config --cflags` -I .. -I ../.. -I ../../backends \
main.cpp ../../backends/imgui_impl_sdl2.cpp ../../backends/imgui_impl_cpu.cpp ../../imgui*.cpp \
`sdl2-config --libs`
```
## Emscripten
Use `Makefile.emscripten`:
```sh
source /path/to/emsdk/emsdk_env.sh
make -f Makefile.emscripten
```
This makes `web/index.html`, `web/index.js`, and `web/index.wasm`.
This example keeps Dear ImGui on the CPU and allocates its framebuffer in the active SDL window surface format, rather than forcing a fixed RGBA32 output format.