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moonpower
2026-03-15 12:33:32 +01:00
parent af86719c5a
commit 31c2e522f5
21 changed files with 3571 additions and 1 deletions
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examples/example_sdl2_cpu/Makefile
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#
# Cross Platform Makefile (example_sdl2_cpu)
# Compatible with MSYS2/MINGW, Linux and macOS
#
# You will need SDL2 (http://www.libsdl.org):
# Linux: apt-get install libsdl2-dev
# macOS: brew install sdl2
# MSYS2: pacman -S mingw-w64-i686-SDL2
#
EXE = example_sdl2_cpu
IMGUI_DIR = ../..
SOURCES = main.cpp
SOURCES += $(IMGUI_DIR)/imgui.cpp $(IMGUI_DIR)/imgui_demo.cpp $(IMGUI_DIR)/imgui_draw.cpp $(IMGUI_DIR)/imgui_tables.cpp $(IMGUI_DIR)/imgui_widgets.cpp
SOURCES += $(IMGUI_DIR)/backends/imgui_impl_sdl2.cpp $(IMGUI_DIR)/backends/imgui_impl_cpu.cpp
OBJS = $(addsuffix .o, $(basename $(notdir $(SOURCES))))
UNAME_S := $(shell uname -s)
SDL2_CONFIG ?= $(shell if command -v sdl2-config >/dev/null 2>&1; then command -v sdl2-config; elif [ -x /opt/homebrew/bin/sdl2-config ]; then echo /opt/homebrew/bin/sdl2-config; elif [ -x /usr/local/bin/sdl2-config ]; then echo /usr/local/bin/sdl2-config; else echo sdl2-config; fi)
CXXFLAGS = -std=c++11 -I$(IMGUI_DIR) -I$(IMGUI_DIR)/backends
OPTFLAGS ?= -O2
CXXFLAGS += -g $(OPTFLAGS) -Wall -Wformat
LIBS =
##---------------------------------------------------------------------
## BUILD FLAGS PER PLATFORM
##---------------------------------------------------------------------
ifeq ($(UNAME_S), Linux) #LINUX
ECHO_MESSAGE = "Linux"
LIBS += `$(SDL2_CONFIG) --libs`
CXXFLAGS += `$(SDL2_CONFIG) --cflags`
CFLAGS = $(CXXFLAGS)
endif
ifeq ($(UNAME_S), Darwin) #APPLE
ECHO_MESSAGE = "Mac OS X"
LIBS += `$(SDL2_CONFIG) --libs`
CXXFLAGS += `$(SDL2_CONFIG) --cflags`
CXXFLAGS += -I/usr/local/include -I/opt/local/include
CFLAGS = $(CXXFLAGS)
endif
ifeq ($(OS), Windows_NT)
ECHO_MESSAGE = "MinGW"
LIBS += -lgdi32 `pkg-config --static --libs sdl2`
CXXFLAGS += `pkg-config --cflags sdl2`
CFLAGS = $(CXXFLAGS)
endif
##---------------------------------------------------------------------
## BUILD RULES
##---------------------------------------------------------------------
%.o:%.cpp
$(CXX) $(CXXFLAGS) -c -o $@ $<
%.o:$(IMGUI_DIR)/%.cpp
$(CXX) $(CXXFLAGS) -c -o $@ $<
%.o:$(IMGUI_DIR)/backends/%.cpp
$(CXX) $(CXXFLAGS) -c -o $@ $<
all: $(EXE)
@echo Build complete for $(ECHO_MESSAGE)
$(EXE): $(OBJS)
$(CXX) -o $@ $^ $(CXXFLAGS) $(LIBS)
clean:
rm -f $(EXE) $(OBJS)
examples/example_sdl2_cpu/Makefile.emscripten
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CC = emcc
CXX = em++
WEB_DIR = web
EXE = $(WEB_DIR)/index.html
IMGUI_DIR = ../..
SOURCES = main.cpp
SOURCES += $(IMGUI_DIR)/imgui.cpp $(IMGUI_DIR)/imgui_demo.cpp $(IMGUI_DIR)/imgui_draw.cpp $(IMGUI_DIR)/imgui_tables.cpp $(IMGUI_DIR)/imgui_widgets.cpp
SOURCES += $(IMGUI_DIR)/backends/imgui_impl_sdl2.cpp $(IMGUI_DIR)/backends/imgui_impl_cpu.cpp
OBJS = $(addprefix em_,$(addsuffix .o, $(basename $(notdir $(SOURCES)))))
CPPFLAGS =
LDFLAGS =
EMS =
EMS += -s USE_SDL=2
EMS += -s DISABLE_EXCEPTION_CATCHING=1
LDFLAGS += -s WASM=1 -s ALLOW_MEMORY_GROWTH=1 -s NO_EXIT_RUNTIME=0 -s ASSERTIONS=1
USE_FILE_SYSTEM ?= 0
ifeq ($(USE_FILE_SYSTEM), 0)
LDFLAGS += -s NO_FILESYSTEM=1
CPPFLAGS += -DIMGUI_DISABLE_FILE_FUNCTIONS
endif
ifeq ($(USE_FILE_SYSTEM), 1)
LDFLAGS += --no-heap-copy --preload-file ../../misc/fonts@/fonts
endif
CPPFLAGS += -I$(IMGUI_DIR) -I$(IMGUI_DIR)/backends
CPPFLAGS += -Wall -Wformat -O2 $(EMS)
LDFLAGS += --shell-file ../libs/emscripten/shell_minimal.html
LDFLAGS += $(EMS)
em_%.o:%.cpp
$(CXX) $(CPPFLAGS) $(CXXFLAGS) -c -o $@ $<
em_%.o:$(IMGUI_DIR)/%.cpp
$(CXX) $(CPPFLAGS) $(CXXFLAGS) -c -o $@ $<
em_%.o:$(IMGUI_DIR)/backends/%.cpp
$(CXX) $(CPPFLAGS) $(CXXFLAGS) -c -o $@ $<
all: $(EXE)
@echo Build complete for $(EXE)
$(WEB_DIR):
mkdir $@
serve: all
python3 -m http.server -d $(WEB_DIR)
$(EXE): $(OBJS) $(WEB_DIR)
$(CXX) -o $@ $(OBJS) $(LDFLAGS)
clean:
rm -rf $(OBJS) $(WEB_DIR)
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.
examples/example_sdl2_cpu/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.
@set OUT_DIR=Debug
@set OUT_EXE=example_sdl2_cpu
@set INCLUDES=/I..\.. /I..\..\backends /I%SDL2_DIR%\include
@set SOURCES=main.cpp ..\..\backends\imgui_impl_sdl2.cpp ..\..\backends\imgui_impl_cpu.cpp ..\..\imgui*.cpp
@set LIBS=/LIBPATH:%SDL2_DIR%\lib\x86 SDL2.lib SDL2main.lib
mkdir %OUT_DIR%
cl /nologo /Zi /O2 /MD /utf-8 %INCLUDES% %SOURCES% /Fe%OUT_DIR%/%OUT_EXE%.exe /Fo%OUT_DIR%/ /link %LIBS% /subsystem:console
examples/example_sdl2_cpu/example_sdl2_cpu
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examples/example_sdl2_cpu/example_sdl2_cpu.vcxproj
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<?xml version="1.0" encoding="utf-8"?>
<Project DefaultTargets="Build" ToolsVersion="14.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
<ItemGroup Label="ProjectConfigurations">
<ProjectConfiguration Include="Debug|Win32">
<Configuration>Debug</Configuration>
<Platform>Win32</Platform>
</ProjectConfiguration>
<ProjectConfiguration Include="Debug|x64">
<Configuration>Debug</Configuration>
<Platform>x64</Platform>
</ProjectConfiguration>
<ProjectConfiguration Include="Release|Win32">
<Configuration>Release</Configuration>
<Platform>Win32</Platform>
</ProjectConfiguration>
<ProjectConfiguration Include="Release|x64">
<Configuration>Release</Configuration>
<Platform>x64</Platform>
</ProjectConfiguration>
</ItemGroup>
<PropertyGroup Label="Globals">
<ProjectGuid>{1E9DB182-9BF1-4C7D-8930-85ACAEAC2458}</ProjectGuid>
<RootNamespace>example_sdl2_cpu</RootNamespace>
<WindowsTargetPlatformVersion>8.1</WindowsTargetPlatformVersion>
<ProjectName>example_sdl2_cpu</ProjectName>
</PropertyGroup>
<Import Project="$(VCTargetsPath)\Microsoft.Cpp.Default.props" />
<PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'" Label="Configuration">
<ConfigurationType>Application</ConfigurationType>
<UseDebugLibraries>true</UseDebugLibraries>
<CharacterSet>MultiByte</CharacterSet>
<PlatformToolset>v140</PlatformToolset>
</PropertyGroup>
<PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'" Label="Configuration">
<ConfigurationType>Application</ConfigurationType>
<UseDebugLibraries>true</UseDebugLibraries>
<CharacterSet>MultiByte</CharacterSet>
<PlatformToolset>v140</PlatformToolset>
</PropertyGroup>
<PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'" Label="Configuration">
<ConfigurationType>Application</ConfigurationType>
<UseDebugLibraries>false</UseDebugLibraries>
<WholeProgramOptimization>true</WholeProgramOptimization>
<CharacterSet>MultiByte</CharacterSet>
<PlatformToolset>v140</PlatformToolset>
</PropertyGroup>
<PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'" Label="Configuration">
<ConfigurationType>Application</ConfigurationType>
<UseDebugLibraries>false</UseDebugLibraries>
<WholeProgramOptimization>true</WholeProgramOptimization>
<CharacterSet>MultiByte</CharacterSet>
<PlatformToolset>v140</PlatformToolset>
</PropertyGroup>
<Import Project="$(VCTargetsPath)\Microsoft.Cpp.props" />
<ImportGroup Label="ExtensionSettings">
</ImportGroup>
<ImportGroup Label="PropertySheets" Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
<Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
</ImportGroup>
<ImportGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'" Label="PropertySheets">
<Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
</ImportGroup>
<ImportGroup Label="PropertySheets" Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
<Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
</ImportGroup>
<ImportGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'" Label="PropertySheets">
<Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
</ImportGroup>
<PropertyGroup Label="UserMacros" />
<PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
<OutDir>$(ProjectDir)$(Configuration)\</OutDir>
<IntDir>$(ProjectDir)$(Configuration)\</IntDir>
<IncludePath>$(IncludePath)</IncludePath>
</PropertyGroup>
<PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">
<OutDir>$(ProjectDir)$(Configuration)\</OutDir>
<IntDir>$(ProjectDir)$(Configuration)\</IntDir>
<IncludePath>$(IncludePath)</IncludePath>
</PropertyGroup>
<PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
<OutDir>$(ProjectDir)$(Configuration)\</OutDir>
<IntDir>$(ProjectDir)$(Configuration)\</IntDir>
<IncludePath>$(IncludePath)</IncludePath>
</PropertyGroup>
<PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
<OutDir>$(ProjectDir)$(Configuration)\</OutDir>
<IntDir>$(ProjectDir)$(Configuration)\</IntDir>
<IncludePath>$(IncludePath)</IncludePath>
</PropertyGroup>
<ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
<ClCompile>
<WarningLevel>Level4</WarningLevel>
<Optimization>Disabled</Optimization>
<AdditionalIncludeDirectories>..\..;..\..\backends;%SDL2_DIR%\include;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
<AdditionalOptions>/utf-8 %(AdditionalOptions)</AdditionalOptions>
</ClCompile>
<Link>
<GenerateDebugInformation>true</GenerateDebugInformation>
<AdditionalLibraryDirectories>%SDL2_DIR%\lib\x86;%(AdditionalLibraryDirectories)</AdditionalLibraryDirectories>
<AdditionalDependencies>SDL2.lib;SDL2main.lib;%(AdditionalDependencies)</AdditionalDependencies>
<SubSystem>Console</SubSystem>
<IgnoreSpecificDefaultLibraries>msvcrt.lib</IgnoreSpecificDefaultLibraries>
</Link>
</ItemDefinitionGroup>
<ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">
<ClCompile>
<WarningLevel>Level4</WarningLevel>
<Optimization>Disabled</Optimization>
<AdditionalIncludeDirectories>..\..;..\..\backends;%SDL2_DIR%\include;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
<AdditionalOptions>/utf-8 %(AdditionalOptions)</AdditionalOptions>
</ClCompile>
<Link>
<GenerateDebugInformation>true</GenerateDebugInformation>
<AdditionalLibraryDirectories>%SDL2_DIR%\lib\x64;%(AdditionalLibraryDirectories)</AdditionalLibraryDirectories>
<AdditionalDependencies>SDL2.lib;SDL2main.lib;%(AdditionalDependencies)</AdditionalDependencies>
<SubSystem>Console</SubSystem>
<IgnoreSpecificDefaultLibraries>msvcrt.lib</IgnoreSpecificDefaultLibraries>
</Link>
</ItemDefinitionGroup>
<ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
<ClCompile>
<WarningLevel>Level4</WarningLevel>
<Optimization>MaxSpeed</Optimization>
<FunctionLevelLinking>true</FunctionLevelLinking>
<IntrinsicFunctions>true</IntrinsicFunctions>
<AdditionalIncludeDirectories>..\..;..\..\backends;%SDL2_DIR%\include;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
<BufferSecurityCheck>false</BufferSecurityCheck>
<AdditionalOptions>/utf-8 %(AdditionalOptions)</AdditionalOptions>
</ClCompile>
<Link>
<GenerateDebugInformation>true</GenerateDebugInformation>
<EnableCOMDATFolding>true</EnableCOMDATFolding>
<OptimizeReferences>true</OptimizeReferences>
<AdditionalLibraryDirectories>%SDL2_DIR%\lib\x86;%(AdditionalLibraryDirectories)</AdditionalLibraryDirectories>
<AdditionalDependencies>SDL2.lib;SDL2main.lib;%(AdditionalDependencies)</AdditionalDependencies>
<SubSystem>Console</SubSystem>
<IgnoreSpecificDefaultLibraries>
</IgnoreSpecificDefaultLibraries>
</Link>
</ItemDefinitionGroup>
<ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
<ClCompile>
<WarningLevel>Level4</WarningLevel>
<Optimization>MaxSpeed</Optimization>
<FunctionLevelLinking>true</FunctionLevelLinking>
<IntrinsicFunctions>true</IntrinsicFunctions>
<AdditionalIncludeDirectories>..\..;..\..\backends;%SDL2_DIR%\include;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
<BufferSecurityCheck>false</BufferSecurityCheck>
<AdditionalOptions>/utf-8 %(AdditionalOptions)</AdditionalOptions>
</ClCompile>
<Link>
<GenerateDebugInformation>true</GenerateDebugInformation>
<EnableCOMDATFolding>true</EnableCOMDATFolding>
<OptimizeReferences>true</OptimizeReferences>
<AdditionalLibraryDirectories>%SDL2_DIR%\lib\x64;%(AdditionalLibraryDirectories)</AdditionalLibraryDirectories>
<AdditionalDependencies>SDL2.lib;SDL2main.lib;%(AdditionalDependencies)</AdditionalDependencies>
<SubSystem>Console</SubSystem>
<IgnoreSpecificDefaultLibraries>
</IgnoreSpecificDefaultLibraries>
</Link>
</ItemDefinitionGroup>
<ItemGroup>
<ClCompile Include="..\..\imgui.cpp" />
<ClCompile Include="..\..\imgui_demo.cpp" />
<ClCompile Include="..\..\imgui_draw.cpp" />
<ClCompile Include="..\..\imgui_tables.cpp" />
<ClCompile Include="..\..\imgui_widgets.cpp" />
<ClCompile Include="..\..\backends\imgui_impl_sdl2.cpp" />
<ClCompile Include="..\..\backends\imgui_impl_cpu.cpp" />
<ClCompile Include="main.cpp" />
</ItemGroup>
<ItemGroup>
<ClInclude Include="..\..\imconfig.h" />
<ClInclude Include="..\..\imgui.h" />
<ClInclude Include="..\..\imgui_internal.h" />
<ClInclude Include="..\..\backends\imgui_impl_sdl2.h" />
<ClInclude Include="..\..\backends\imgui_impl_cpu.h" />
</ItemGroup>
<ItemGroup>
<None Include="..\..\misc\debuggers\imgui.natstepfilter" />
<None Include="..\..\misc\debuggers\imgui.natvis" />
<None Include="..\README.txt" />
</ItemGroup>
<Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
<ImportGroup Label="ExtensionTargets">
</ImportGroup>
</Project>
examples/example_sdl2_cpu/example_sdl2_cpu.vcxproj.filters
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<?xml version="1.0" encoding="utf-8"?>
<Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
<ItemGroup>
<Filter Include="imgui">
<UniqueIdentifier>{20b90ce4-7fcb-4731-b9a0-075f875de82d}</UniqueIdentifier>
</Filter>
<Filter Include="sources">
<UniqueIdentifier>{f18ab499-84e1-499f-8eff-9754361e0e52}</UniqueIdentifier>
<Extensions>cpp;c;cc;cxx;def;odl;idl;hpj;bat;asm;asmx</Extensions>
</Filter>
</ItemGroup>
<ItemGroup>
<ClCompile Include="..\..\imgui.cpp">
<Filter>imgui</Filter>
</ClCompile>
<ClCompile Include="..\..\imgui_demo.cpp">
<Filter>imgui</Filter>
</ClCompile>
<ClCompile Include="..\..\imgui_draw.cpp">
<Filter>imgui</Filter>
</ClCompile>
<ClCompile Include="main.cpp">
<Filter>sources</Filter>
</ClCompile>
<ClCompile Include="..\..\imgui_tables.cpp">
<Filter>imgui</Filter>
</ClCompile>
<ClCompile Include="..\..\imgui_widgets.cpp">
<Filter>imgui</Filter>
</ClCompile>
<ClCompile Include="..\..\backends\imgui_impl_sdl2.cpp">
<Filter>sources</Filter>
</ClCompile>
<ClCompile Include="..\..\backends\imgui_impl_cpu.cpp">
<Filter>sources</Filter>
</ClCompile>
</ItemGroup>
<ItemGroup>
<ClInclude Include="..\..\imconfig.h">
<Filter>imgui</Filter>
</ClInclude>
<ClInclude Include="..\..\imgui.h">
<Filter>imgui</Filter>
</ClInclude>
<ClInclude Include="..\..\imgui_internal.h">
<Filter>imgui</Filter>
</ClInclude>
<ClInclude Include="..\..\backends\imgui_impl_cpu.h">
<Filter>sources</Filter>
</ClInclude>
<ClInclude Include="..\..\backends\imgui_impl_sdl2.h">
<Filter>sources</Filter>
</ClInclude>
</ItemGroup>
<ItemGroup>
<None Include="..\README.txt" />
<None Include="..\..\misc\debuggers\imgui.natvis">
<Filter>imgui</Filter>
</None>
<None Include="..\..\misc\debuggers\imgui.natstepfilter">
<Filter>imgui</Filter>
</None>
</ItemGroup>
</Project>
examples/example_sdl2_cpu/main.cpp
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// main.cpp
// Example program using imgui_impl_cpu backend
#include "imgui.h"
#include "imgui_impl_cpu.h"
#include "imgui_impl_sdl2.h"
#include <SDL.h>
#include <chrono>
#include <stdio.h>
#include <string.h>
#ifdef __EMSCRIPTEN__
#include "../libs/emscripten/emscripten_mainloop_stub.h"
#endif
struct ExampleTimingHistory
{
double Samples[120];
int Count;
int Offset;
ExampleTimingHistory() : Count(0), Offset(0) { memset(Samples, 0, sizeof(Samples)); }
void AddSample(double value_ms)
{
Samples[Offset] = value_ms;
Offset = (Offset + 1) % IM_ARRAYSIZE(Samples);
if (Count < IM_ARRAYSIZE(Samples))
Count++;
}
double GetAverageMs() const
{
if (Count == 0)
return 0.0;
double total = 0.0;
for (int i = 0; i < Count; i++)
total += Samples[i];
return total / (double)Count;
}
};
struct ExampleFramebuffer
{
ImVector<unsigned char> Storage;
ImVector<ImU32> Palette;
ImGui_ImplCPU_PixelFormat Format;
ImGui_ImplCPU_Framebuffer CPU;
SDL_Surface* Surface;
Uint32 SDLFormat;
ExampleFramebuffer() { memset((void*)this, 0, sizeof(*this)); }
};
static double ExampleGetTimeMs()
{
typedef std::chrono::steady_clock Clock;
return std::chrono::duration<double, std::milli>(Clock::now().time_since_epoch()).count();
}
static void InitCPUFormatFromSDL(ImGui_ImplCPU_PixelFormat* out, ImVector<ImU32>* out_palette, const SDL_PixelFormat* format)
{
memset(out, 0, sizeof(*out));
out->BitsPerPixel = format->BitsPerPixel;
out->BytesPerPixel = format->BytesPerPixel;
out->Rmask = format->Rmask;
out->Gmask = format->Gmask;
out->Bmask = format->Bmask;
out->Amask = format->Amask;
out->Rshift = (ImU8)format->Rshift;
out->Gshift = (ImU8)format->Gshift;
out->Bshift = (ImU8)format->Bshift;
out->Ashift = (ImU8)format->Ashift;
out->Rloss = (ImU8)format->Rloss;
out->Gloss = (ImU8)format->Gloss;
out->Bloss = (ImU8)format->Bloss;
out->Aloss = (ImU8)format->Aloss;
out->Palette = nullptr;
out->PaletteSize = 0;
out->MapColorFn = nullptr;
out_palette->clear();
if (format->palette != nullptr && format->palette->colors != nullptr && format->palette->ncolors > 0)
{
out_palette->resize(format->palette->ncolors);
for (int i = 0; i < format->palette->ncolors; i++)
{
const SDL_Color& c = format->palette->colors[i];
(*out_palette)[i] = IM_COL32(c.r, c.g, c.b, c.a);
}
out->Palette = out_palette->Data;
out->PaletteSize = out_palette->Size;
}
}
static bool RecreateFramebuffer(ExampleFramebuffer* framebuffer, SDL_Surface* window_surface)
{
if (framebuffer->Surface != nullptr)
{
SDL_FreeSurface(framebuffer->Surface);
framebuffer->Surface = nullptr;
}
const int width = window_surface->w;
const int height = window_surface->h;
const int bytes_per_pixel = window_surface->format->BytesPerPixel;
if (width <= 0 || height <= 0 || bytes_per_pixel <= 0)
return false;
InitCPUFormatFromSDL(&framebuffer->Format, &framebuffer->Palette, window_surface->format);
framebuffer->Storage.resize(width * height * bytes_per_pixel);
framebuffer->CPU.Pixels = framebuffer->Storage.Data;
framebuffer->CPU.Width = width;
framebuffer->CPU.Height = height;
framebuffer->CPU.Pitch = width * bytes_per_pixel;
framebuffer->CPU.Format = &framebuffer->Format;
framebuffer->SDLFormat = window_surface->format->format;
framebuffer->Surface = SDL_CreateRGBSurfaceWithFormatFrom(framebuffer->CPU.Pixels, width, height, window_surface->format->BitsPerPixel, framebuffer->CPU.Pitch, window_surface->format->format);
return framebuffer->Surface != nullptr;
}
int main(int, char**)
{
// Setup SDL
if (SDL_Init(SDL_INIT_VIDEO | SDL_INIT_TIMER | SDL_INIT_GAMECONTROLLER) != 0)
{
printf("Error: %s\n", SDL_GetError());
return -1;
}
// From 2.0.18: Enable native IME.
#ifdef SDL_HINT_IME_SHOW_UI
SDL_SetHint(SDL_HINT_IME_SHOW_UI, "1");
#endif
// Create window
float main_scale = ImGui_ImplSDL2_GetContentScaleForDisplay(0);
SDL_WindowFlags window_flags = (SDL_WindowFlags)(SDL_WINDOW_RESIZABLE | SDL_WINDOW_ALLOW_HIGHDPI | SDL_WINDOW_SHOWN);
SDL_Window* window = SDL_CreateWindow("Dear ImGui SDL2+CPU Example",
SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED,
(int)(1280 * main_scale), (int)(720 * main_scale), window_flags);
if (!window)
{
printf("Error creating window: %s\n", SDL_GetError());
return -1;
}
SDL_Surface* window_surface = SDL_GetWindowSurface(window);
if (!window_surface)
{
printf("Error getting window surface: %s\n", SDL_GetError());
return -1;
}
int win_w = window_surface->w;
int win_h = window_surface->h;
ExampleFramebuffer framebuffer;
if (!RecreateFramebuffer(&framebuffer, window_surface))
{
printf("Error creating framebuffer: %s\n", SDL_GetError());
return -1;
}
// Setup Dear ImGui context
IMGUI_CHECKVERSION();
ImGui::CreateContext();
ImGuiIO& io = ImGui::GetIO(); (void)io;
io.ConfigFlags |= ImGuiConfigFlags_NavEnableKeyboard; // Enable Keyboard Controls
io.ConfigFlags |= ImGuiConfigFlags_NavEnableGamepad; // Enable Gamepad Controls
#ifdef __EMSCRIPTEN__
io.IniFilename = nullptr;
#endif
// Setup Dear ImGui style
ImGui::StyleColorsDark();
// Setup scaling
ImGuiStyle& style = ImGui::GetStyle();
style.ScaleAllSizes(main_scale); // Bake a fixed style scale.
style.FontScaleDpi = main_scale;
// Setup Platform/Renderer backends
ImGui_ImplSDL2_InitForOther(window);
ImGui_ImplSDL2_SetGamepadMode(ImGui_ImplSDL2_GamepadMode_AutoFirst, nullptr, 0);
ImGui_ImplCPU_Init();
// Our state
bool show_demo_window = true;
bool show_another_window = false;
ImVec4 clear_color = ImVec4(0.45f, 0.55f, 0.60f, 1.00f);
ExampleTimingHistory raster_times;
ExampleTimingHistory present_times;
// Main loop
bool done = false;
#ifdef __EMSCRIPTEN__
EMSCRIPTEN_MAINLOOP_BEGIN
#else
while (!done)
#endif
{
// Poll and handle events (inputs, window resize, etc.)
SDL_Event event;
while (SDL_PollEvent(&event))
{
ImGui_ImplSDL2_ProcessEvent(&event);
if (event.type == SDL_QUIT)
done = true;
if (event.type == SDL_WINDOWEVENT)
{
if (event.window.event == SDL_WINDOWEVENT_CLOSE && event.window.windowID == SDL_GetWindowID(window))
done = true;
if (event.window.event == SDL_WINDOWEVENT_SIZE_CHANGED || event.window.event == SDL_WINDOWEVENT_RESIZED)
{
// Recreate framebuffer at new size
window_surface = SDL_GetWindowSurface(window);
int new_w = window_surface->w;
int new_h = window_surface->h;
if (new_w != win_w || new_h != win_h || window_surface->format->format != framebuffer.SDLFormat)
{
if (!RecreateFramebuffer(&framebuffer, window_surface))
{
printf("Error creating framebuffer after resize: %s\n", SDL_GetError());
return -1;
}
win_w = new_w;
win_h = new_h;
}
}
}
}
// Skip rendering when minimized to avoid busy-looping
if (SDL_GetWindowFlags(window) & SDL_WINDOW_MINIMIZED)
{
SDL_Delay(10);
continue;
}
// Start the Dear ImGui frame
ImGui_ImplCPU_NewFrame();
ImGui_ImplSDL2_NewFrame();
ImGui::NewFrame();
int logical_w = 0;
int logical_h = 0;
SDL_GetWindowSize(window, &logical_w, &logical_h);
// 1. Show the big demo window
if (show_demo_window)
ImGui::ShowDemoWindow(&show_demo_window);
// 2. Show a simple window that we create ourselves. Mirror the SDL_Renderer example.
{
static float f = 0.0f;
static int counter = 0;
ImGui::Begin("Hello, world!"); // Create a window called "Hello, world!" and append into it.
ImGui::Text("This is some useful text."); // Display some text
ImGui::Checkbox("Demo Window", &show_demo_window); // Edit bools storing our window open/close state
ImGui::Checkbox("Another Window", &show_another_window);
ImGui::SliderFloat("float", &f, 0.0f, 1.0f); // Edit 1 float using a slider from 0.0f to 1.0f
ImGui::ColorEdit3("clear color", (float*)&clear_color); // Edit 3 floats representing a color
if (ImGui::Button("Button")) // Buttons return true when clicked
counter++;
ImGui::SameLine();
ImGui::Text("counter = %d", counter);
ImGui::Text("Raster %.3f ms | Present %.3f ms", raster_times.GetAverageMs(), present_times.GetAverageMs());
ImGui::Text("Window %d x %d | Framebuffer %d x %d", logical_w, logical_h, framebuffer.CPU.Width, framebuffer.CPU.Height);
ImGui::Text("Application average %.3f ms/frame (%.1f FPS)", 1000.0f / io.Framerate, io.Framerate);
ImGui::End();
}
// 3. Show another simple window.
if (show_another_window)
{
ImGui::Begin("Another Window", &show_another_window); // Pass a pointer to our bool variable (the window will have a closing button that will clear the bool when clicked)
ImGui::Text("Hello from another window!");
if (ImGui::Button("Close Me"))
show_another_window = false;
ImGui::End();
}
// Rendering
ImGui::Render();
const double raster_start_ms = ExampleGetTimeMs();
SDL_FillRect(framebuffer.Surface, nullptr, SDL_MapRGBA(framebuffer.Surface->format,
(Uint8)(clear_color.x * 255),
(Uint8)(clear_color.y * 255),
(Uint8)(clear_color.z * 255),
(Uint8)(clear_color.w * 255)));
ImGui_ImplCPU_RenderDrawData(ImGui::GetDrawData(), &framebuffer.CPU);
raster_times.AddSample(ExampleGetTimeMs() - raster_start_ms);
const double present_start_ms = ExampleGetTimeMs();
SDL_BlitSurface(framebuffer.Surface, nullptr, window_surface, nullptr);
SDL_UpdateWindowSurface(window);
present_times.AddSample(ExampleGetTimeMs() - present_start_ms);
}
#ifdef __EMSCRIPTEN__
EMSCRIPTEN_MAINLOOP_END;
#endif
ImGui_ImplCPU_Shutdown();
ImGui_ImplSDL2_Shutdown();
ImGui::DestroyContext();
if (framebuffer.Surface != nullptr)
SDL_FreeSurface(framebuffer.Surface);
SDL_DestroyWindow(window);
SDL_Quit();
return 0;
}