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Implement Win32+GDI Example.
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‎backends/imgui_impl_gdi.cpp‎

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‎backends/imgui_impl_gdi.h‎

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// dear imgui: Renderer Backend for Windows GDI
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// This needs to be used along with a Platform Backend (e.g. Win32)
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// Implemented features:
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// [x] Renderer: Basic Implementation
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// The aim of imgui_impl_gdi.h/.cpp is to be usable in your engine without any modification.
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// IF YOU FEEL YOU NEED TO MAKE ANY CHANGE TO THIS CODE, please share them and your feedback at https://github.com/ocornut/imgui/
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// You can use unmodified imgui_impl_* files in your project. See examples/ folder for examples of using this.
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// Prefer including the entire imgui/ repository into your project (either as a copy or as a submodule), and only build the backends you need.
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// Learn about Dear ImGui:
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// - FAQ https://dearimgui.com/faq
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// - Getting Started https://dearimgui.com/getting-started
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// - Documentation https://dearimgui.com/docs (same as your local docs/ folder).
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// - Introduction, links and more at the top of imgui.cpp
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#pragma once
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#include "imgui.h" // IMGUI_IMPL_API
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#ifndef IMGUI_DISABLE
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// Follow "Getting Started" link and check examples/ folder to learn about using backends!
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IMGUI_IMPL_API bool ImGui_ImplGDI_Init();
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IMGUI_IMPL_API void ImGui_ImplGDI_Shutdown();
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IMGUI_IMPL_API void ImGui_ImplGDI_NewFrame();
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IMGUI_IMPL_API void ImGui_ImplGDI_RenderDrawData(ImDrawData* draw_data, void* fb_dev_ctx_handle, ImVec4* clear_color); // HDC fb_dev_ctx_handle
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#endif // #ifndef IMGUI_DISABLE

‎examples/example_win32_gdi/build_mingw.bat‎

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@REM Build for MINGW64 or 32 from MSYS2.
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@set OUT_DIR=Debug
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@set OUT_EXE=example_win32_gdi
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@set INCLUDES=-I../.. -I../../backends
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@set SOURCES=main.cpp ../../backends/imgui_impl_gdi.cpp ../../backends/imgui_impl_win32.cpp ../../imgui*.cpp
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@set LIBS=-lgdi32 -ldwmapi
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mkdir %OUT_DIR%
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g++ -DUNICODE %INCLUDES% %SOURCES% -o %OUT_DIR%/%OUT_EXE%.exe --static -mwindows %LIBS% %LIBS%

‎examples/example_win32_gdi/build_win32.bat‎

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@REM Build for Visual Studio compiler. Run your copy of vcvars32.bat or vcvarsall.bat to setup command-line compiler.
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@set OUT_DIR=Debug
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@set OUT_EXE=example_win32_gdi
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@set INCLUDES=/I..\.. /I..\..\backends
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@set SOURCES=main.cpp ..\..\backends\imgui_impl_gdi.cpp ..\..\backends\imgui_impl_win32.cpp ..\..\imgui*.cpp
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@set LIBS=gdi32.lib dwmapi.lib
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mkdir %OUT_DIR%
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cl /nologo /Zi /MD /utf-8 %INCLUDES% /D UNICODE /D _UNICODE %SOURCES% /Fe%OUT_DIR%/%OUT_EXE%.exe /Fo%OUT_DIR%/ /link %LIBS%

‎examples/example_win32_gdi/example_win32_gdi.vcxproj‎

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<?xml version="1.0" encoding="utf-8"?>
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<Project DefaultTargets="Build" ToolsVersion="14.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
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<ItemGroup Label="ProjectConfigurations">
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<ProjectConfiguration Include="Debug|Win32">
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<Configuration>Debug</Configuration>
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<Platform>Win32</Platform>
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</ProjectConfiguration>
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<ProjectConfiguration Include="Debug|x64">
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<Configuration>Debug</Configuration>
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<Platform>x64</Platform>
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</ProjectConfiguration>
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<ProjectConfiguration Include="Release|Win32">
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<Configuration>Release</Configuration>
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<Platform>Win32</Platform>
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</ProjectConfiguration>
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<ProjectConfiguration Include="Release|x64">
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<Configuration>Release</Configuration>
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<Platform>x64</Platform>
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</ProjectConfiguration>
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</ItemGroup>
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<PropertyGroup Label="Globals">
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<ProjectGuid>{42FC7E85-A0C2-45A2-9A7C-A873A9F2B3E7}</ProjectGuid>
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<RootNamespace>example_win32_gdi</RootNamespace>
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<WindowsTargetPlatformVersion>8.1</WindowsTargetPlatformVersion>
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</PropertyGroup>
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<Import Project="$(VCTargetsPath)\Microsoft.Cpp.Default.props" />
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<PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'" Label="Configuration">
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<ConfigurationType>Application</ConfigurationType>
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<UseDebugLibraries>true</UseDebugLibraries>
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<CharacterSet>Unicode</CharacterSet>
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<ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
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<ItemGroup>
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<ClCompile Include="..\..\imgui.cpp" />
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<ClCompile Include="..\..\imgui_demo.cpp" />
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<ClCompile Include="..\..\imgui_draw.cpp" />
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<ClCompile Include="..\..\imgui_tables.cpp" />
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<ClCompile Include="..\..\imgui_widgets.cpp" />
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<ClCompile Include="..\..\backends\imgui_impl_gdi.cpp" />
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<ClCompile Include="..\..\backends\imgui_impl_win32.cpp" />
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<ClCompile Include="main.cpp" />
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<ClInclude Include="..\..\imgui_internal.h" />
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<ImportGroup Label="ExtensionTargets">
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‎examples/example_win32_gdi/example_win32_gdi.vcxproj.filters‎

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<Extensions>cpp;c;cc;cxx;def;odl;idl;hpj;bat;asm;asmx</Extensions>
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