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Doc: various tweaks + tweak imconfig comments.

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24
docs/CHANGELOG.txt
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@ -5,31 +5,37 @@ This document holds the user-facing changelog that we also use in release notes.
We generally fold multiple commits pertaining to the same topic as a single entry.
Changes to backends are also included within the individual .cpp files of each backend.
RELEASE NOTES: https://github.com/ocornut/imgui/releases
REPORT ISSUES: https://github.com/ocornut/imgui/issues
DISCUSS, ASK QUESTIONS: https://github.com/ocornut/imgui/discussions
WIKI https://github.com/ocornut/imgui/wiki
FAQ https://www.dearimgui.com/faq/
RELEASE NOTES: https://github.com/ocornut/imgui/releases
WIKI https://github.com/ocornut/imgui/wiki
GETTING STARTED https://github.com/ocornut/imgui/wiki/Getting-Started
GLOSSARY https://github.com/ocornut/imgui/wiki/Glossary
ISSUES & SUPPORT https://github.com/ocornut/imgui/issues
WHEN TO UPDATE?
- Keeping your copy of Dear ImGui updated regularly is recommended.
- It is generally safe to sync to the latest commit in master or docking branches
The library is fairly stable and regressions tends to be fixed fast when reported.
- It is generally safe and recommended to sync to the latest commit in 'master' or 'docking'
branches. The library is fairly stable and regressions tends to be fixed fast when reported.
HOW TO UPDATE?
- Overwrite every file except imconfig.h (if you have modified it).
- You may also locally branch to modify imconfig.h and merge latest into your branch.
- Update submodule or copy/overwrite every file.
- About imconfig.h:
- You may modify your copy of imconfig.h, in this case don't overwrite it.
- or you may locally branch to modify imconfig.h and merge/rebase latest.
- or you may '#define IMGUI_USER_CONFIG "my_config_file.h"' globally from your build system to
specify a custom path for your imconfig.h file and instead not have to modify the default one.
- Read the `Breaking Changes` section (in imgui.cpp or here in the Changelog).
- If you have a problem with a missing function/symbols, search for its name in the code, there will likely be a comment about it.
- If you are dropping this repository in your codebase, please leave the demo and text files in there, they will be useful.
- If you are copying this repository in your codebase, please leave the demo and documentations files in there, they will be useful.
- You may diff your previous Changelog with the one you just copied and read that diff.
- You may enable `IMGUI_DISABLE_OBSOLETE_FUNCTIONS` in imconfig.h to forcefully disable legacy names and symbols.
Doing it every once in a while is a good way to make sure you are not using obsolete symbols. Dear ImGui is in active development,
and API updates have been a little more frequent lately. They are documented below and in imgui.cpp and should not affect all users.
- Please report any issue!
-----------------------------------------------------------------------
VERSION 1.89.8 WIP (In Progress)
-----------------------------------------------------------------------

1
docs/FAQ.md
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@ -91,6 +91,7 @@ Many projects are using this branch and it is kept in sync with master regularly
### Q: How to get started?
Read [Getting Started](https://github.com/ocornut/imgui/wiki/Getting-Started). <BR>
Read [EXAMPLES.md](https://github.com/ocornut/imgui/blob/master/docs/EXAMPLES.md). <BR>
Read [BACKENDS.md](https://github.com/ocornut/imgui/blob/master/docs/BACKENDS.md). <BR>
Read `PROGRAMMER GUIDE` section of [imgui.cpp](https://github.com/ocornut/imgui/blob/master/imgui.cpp). <BR>

14
imconfig.h
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@ -1,5 +1,5 @@
//-----------------------------------------------------------------------------
// COMPILE-TIME OPTIONS FOR DEAR IMGUI
// DEAR IMGUI COMPILE-TIME OPTIONS
// Runtime options (clipboard callbacks, enabling various features, etc.) can generally be set via the ImGuiIO structure.
// You can use ImGui::SetAllocatorFunctions() before calling ImGui::CreateContext() to rewire memory allocation functions.
//-----------------------------------------------------------------------------
@ -9,7 +9,7 @@
// You need to make sure that configuration settings are defined consistently _everywhere_ Dear ImGui is used, which include the imgui*.cpp
// files but also _any_ of your code that uses Dear ImGui. This is because some compile-time options have an affect on data structures.
// Defining those options in imconfig.h will ensure every compilation unit gets to see the same data structure layouts.
// Call IMGUI_CHECKVERSION() from your .cpp files to verify that the data structures your files are using are matching the ones imgui.cpp is using.
// Call IMGUI_CHECKVERSION() from your .cpp file to verify that the data structures your files are using are matching the ones imgui.cpp is using.
//-----------------------------------------------------------------------------
#pragma once
@ -26,7 +26,7 @@
//#define IMGUI_API __declspec( dllexport )
//#define IMGUI_API __declspec( dllimport )
//---- Don't define obsolete functions/enums/behaviors. Consider enabling from time to time after updating to avoid using soon-to-be obsolete function/names.
//---- Don't define obsolete functions/enums/behaviors. Consider enabling from time to time after updating to clean your code of obsolete function/names.
//#define IMGUI_DISABLE_OBSOLETE_FUNCTIONS
//#define IMGUI_DISABLE_OBSOLETE_KEYIO // 1.87: disable legacy io.KeyMap[]+io.KeysDown[] in favor io.AddKeyEvent(). This will be folded into IMGUI_DISABLE_OBSOLETE_FUNCTIONS in a few versions.
@ -40,7 +40,7 @@
//#define IMGUI_DISABLE_WIN32_DEFAULT_CLIPBOARD_FUNCTIONS // [Win32] Don't implement default clipboard handler. Won't use and link with OpenClipboard/GetClipboardData/CloseClipboard etc. (user32.lib/.a, kernel32.lib/.a)
//#define IMGUI_ENABLE_WIN32_DEFAULT_IME_FUNCTIONS // [Win32] [Default with Visual Studio] Implement default IME handler (require imm32.lib/.a, auto-link for Visual Studio, -limm32 on command-line for MinGW)
//#define IMGUI_DISABLE_WIN32_DEFAULT_IME_FUNCTIONS // [Win32] [Default with non-Visual Studio compilers] Don't implement default IME handler (won't require imm32.lib/.a)
//#define IMGUI_DISABLE_WIN32_FUNCTIONS // [Win32] Won't use and link with any Win32 function (clipboard, ime).
//#define IMGUI_DISABLE_WIN32_FUNCTIONS // [Win32] Won't use and link with any Win32 function (clipboard, IME).
//#define IMGUI_ENABLE_OSX_DEFAULT_CLIPBOARD_FUNCTIONS // [OSX] Implement default OSX clipboard handler (need to link with '-framework ApplicationServices', this is why this is not the default).
//#define IMGUI_DISABLE_DEFAULT_FORMAT_FUNCTIONS // Don't implement ImFormatString/ImFormatStringV so you can implement them yourself (e.g. if you don't want to link with vsnprintf)
//#define IMGUI_DISABLE_DEFAULT_MATH_FUNCTIONS // Don't implement ImFabs/ImSqrt/ImPow/ImFmod/ImCos/ImSin/ImAcos/ImAtan2 so you can implement them yourself.
@ -105,7 +105,7 @@
//typedef void (*MyImDrawCallback)(const ImDrawList* draw_list, const ImDrawCmd* cmd, void* my_renderer_user_data);
//#define ImDrawCallback MyImDrawCallback
//---- Debug Tools: Macro to break in Debugger
//---- Debug Tools: Macro to break in Debugger (we provide a default implementation of this in the codebase)
// (use 'Metrics->Tools->Item Picker' to pick widgets with the mouse and break into them for easy debugging.)
//#define IM_DEBUG_BREAK IM_ASSERT(0)
//#define IM_DEBUG_BREAK __debugbreak()
@ -113,10 +113,10 @@
//---- Debug Tools: Enable slower asserts
//#define IMGUI_DEBUG_PARANOID
//---- Tip: You can add extra functions within the ImGui:: namespace, here or in your own headers files.
//---- Tip: You can add extra functions within the ImGui:: namespace from anywhere (e.g. your own sources/header files)
/*
namespace ImGui
{
void MyFunction(const char* name, const MyMatrix44& v);
void MyFunction(const char* name, MyMatrix44* mtx);
}
*/

69
imgui.cpp
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@ -16,6 +16,7 @@
// - Getting Started https://github.com/ocornut/imgui/wiki/Getting-Started
// - Glossary https://github.com/ocornut/imgui/wiki/Glossary
// - Issues & support https://github.com/ocornut/imgui/issues
// - Tests & Automation https://github.com/ocornut/imgui_test_engine
// Getting Started?
// - Read https://github.com/ocornut/imgui/wiki/Getting-Started
@ -25,8 +26,9 @@
// Developed by Omar Cornut and every direct or indirect contributors to the GitHub.
// See LICENSE.txt for copyright and licensing details (standard MIT License).
// This library is free but needs your support to sustain development and maintenance.
// Businesses: you can support continued development via invoiced technical support, maintenance and sponsoring contracts. Please reach out to "contact AT dearimgui.com".
// Individuals: you can support continued development via donations. See docs/README or web page.
// Businesses: you can support continued development via B2B invoiced technical support, maintenance and sponsoring contracts.
// PLEASE reach out at contact AT dearimgui DOT com. See https://github.com/ocornut/imgui/wiki/Sponsors
// Businesses: you can also purchase licenses for the Dear ImGui Automation/Test Engine.
// It is recommended that you don't modify imgui.cpp! It will become difficult for you to update the library.
// Note that 'ImGui::' being a namespace, you can add functions into the namespace from your own source files, without
@ -109,9 +111,10 @@ CODE
- Portable, minimize dependencies, run on target (consoles, phones, etc.).
- Efficient runtime and memory consumption.
Designed for developers and content-creators, not the typical end-user! Some of the current weaknesses includes:
Designed primarily for developers and content-creators, not the typical end-user!
Some of the current weaknesses (which we aim to address in the future) includes:
- Doesn't look fancy, doesn't animate.
- Doesn't look fancy.
- Limited layout features, intricate layouts are typically crafted in code.
@ -190,9 +193,11 @@ CODE
READ FIRST
----------
- Remember to check the wonderful Wiki (https://github.com/ocornut/imgui/wiki)
- Your code creates the UI, if your code doesn't run the UI is gone! The UI can be highly dynamic, there are no construction or
destruction steps, less superfluous data retention on your side, less state duplication, less state synchronization, fewer bugs.
- Your code creates the UI every frame of your application loop, if your code doesn't run the UI is gone!
The UI can be highly dynamic, there are no construction or destruction steps, less superfluous
data retention on your side, less state duplication, less state synchronization, fewer bugs.
- Call and read ImGui::ShowDemoWindow() for demo code demonstrating most features.
Or browse https://pthom.github.io/imgui_manual_online/manual/imgui_manual.html for interactive web version.
- The library is designed to be built from sources. Avoid pre-compiled binaries and packaged versions. See imconfig.h to configure your build.
- Dear ImGui is an implementation of the IMGUI paradigm (immediate-mode graphical user interface, a term coined by Casey Muratori).
You can learn about IMGUI principles at http://www.johno.se/book/imgui.html, http://mollyrocket.com/861 & more links in Wiki.
@ -200,18 +205,38 @@ CODE
For every application frame, your UI code will be called only once. This is in contrast to e.g. Unity's implementation of an IMGUI,
where the UI code is called multiple times ("multiple passes") from a single entry point. There are pros and cons to both approaches.
- Our origin is on the top-left. In axis aligned bounding boxes, Min = top-left, Max = bottom-right.
- This codebase is also optimized to yield decent performances with typical "Debug" builds settings.
- Please make sure you have asserts enabled (IM_ASSERT redirects to assert() by default, but can be redirected).
If you get an assert, read the messages and comments around the assert.
- C++: this is a very C-ish codebase: we don't rely on C++11, we don't include any C++ headers, and ImGui:: is a namespace.
- This codebase aims to be highly optimized:
- A typical idle frame should never call malloc/free.
- We rely on a maximum of constant-time or O(N) algorithms. Limiting searches/scans as much as possible.
- We put particular energy in making sure performances are decent with typical "Debug" build settings as well.
Which mean we tend to avoid over-relying on "zero-cost abstraction" as they aren't zero-cost at all.
- This codebase aims to be both highly opinionated and highly flexible:
- This code works because of the things it choose to solve or not solve.
- C++: this is a pragmatic C-ish codebase: we don't use fancy C++ features, we don't include C++ headers,
and ImGui:: is a namespace. We rarely use member functions (and when we did, I am mostly regretting it now).
This is to increase compatibility, increase maintainability and facilitate use from other languages.
- C++: ImVec2/ImVec4 do not expose math operators by default, because it is expected that you use your own math types.
See FAQ "How can I use my own math types instead of ImVec2/ImVec4?" for details about setting up imconfig.h for that.
However, imgui_internal.h can optionally export math operators for ImVec2/ImVec4, which we use in this codebase.
- C++: pay attention that ImVector<> manipulates plain-old-data and does not honor construction/destruction (avoid using it in your code!).
We can can optionally export math operators for ImVec2/ImVec4 using IMGUI_DEFINE_MATH_OPERATORS, which we use internally.
- C++: pay attention that ImVector<> manipulates plain-old-data and does not honor construction/destruction
(so don't use ImVector in your code or at our own risk!).
- Building: We don't use nor mandate a build system for the main library.
This is in an effort to ensure that it works in the real world aka with any esoteric build setup.
This is also because providing a build system for the main library would be of little-value.
The build problems are almost never coming from the main library but from specific backends.
HOW TO UPDATE TO A NEWER VERSION OF DEAR IMGUI
----------------------------------------------
- Update submodule or copy/overwrite every file.
- About imconfig.h:
- You may modify your copy of imconfig.h, in this case don't overwrite it.
- or you may locally branch to modify imconfig.h and merge/rebase latest.
- or you may '#define IMGUI_USER_CONFIG "my_config_file.h"' globally from your build system to
specify a custom path for your imconfig.h file and instead not have to modify the default one.
- Overwrite all the sources files except for imconfig.h (if you have modified your copy of imconfig.h)
- Or maintain your own branch where you have imconfig.h modified as a top-most commit which you can regularly rebase over "master".
- You can also use '#define IMGUI_USER_CONFIG "my_config_file.h" to redirect configuration to your own file.
@ -220,11 +245,12 @@ CODE
from the public API. If you have a problem with a missing function/symbols, search for its name in the code, there will
likely be a comment about it. Please report any issue to the GitHub page!
- To find out usage of old API, you can add '#define IMGUI_DISABLE_OBSOLETE_FUNCTIONS' in your configuration file.
- Try to keep your copy of Dear ImGui reasonably up to date.
- Try to keep your copy of Dear ImGui reasonably up to date!
GETTING STARTED WITH INTEGRATING DEAR IMGUI IN YOUR CODE/ENGINE
---------------------------------------------------------------
- See https://github.com/ocornut/imgui/wiki/Getting-Started.
- Run and study the examples and demo in imgui_demo.cpp to get acquainted with the library.
- In the majority of cases you should be able to use unmodified backends files available in the backends/ folder.
- Add the Dear ImGui source files + selected backend source files to your projects or using your preferred build system.
@ -806,11 +832,12 @@ CODE
Q: Where is the documentation?
A: This library is poorly documented at the moment and expects the user to be acquainted with C/C++.
- Run the examples/ and explore them.
- Run the examples/ applications and explore them.
- Read Getting Started (https://github.com/ocornut/imgui/wiki/Getting-Started) guide.
- See demo code in imgui_demo.cpp and particularly the ImGui::ShowDemoWindow() function.
- The demo covers most features of Dear ImGui, so you can read the code and see its output.
- See documentation and comments at the top of imgui.cpp + effectively imgui.h.
- Dozens of standalone example applications using e.g. OpenGL/DirectX are provided in the
- 20+ standalone example applications using e.g. OpenGL/DirectX are provided in the
examples/ folder to explain how to integrate Dear ImGui with your own engine/application.
- The Wiki (https://github.com/ocornut/imgui/wiki) has many resources and links.
- The Glossary (https://github.com/ocornut/imgui/wiki/Glossary) page also may be useful.
@ -826,14 +853,14 @@ CODE
================
Q: How to get started?
A: Read 'PROGRAMMER GUIDE' above. Read examples/README.txt.
A: Read https://github.com/ocornut/imgui/wiki/Getting-Started. Read 'PROGRAMMER GUIDE' above. Read examples/README.txt.
Q: How can I tell whether to dispatch mouse/keyboard to Dear ImGui or my application?
A: You should read the 'io.WantCaptureMouse', 'io.WantCaptureKeyboard' and 'io.WantTextInput' flags!
>> See https://www.dearimgui.com/faq for a fully detailed answer. You really want to read this.
Q. How can I enable keyboard controls?
Q: How can I use this without a mouse, without a keyboard or without a screen? (gamepad, input share, remote display)
Q. How can I enable keyboard or gamepad controls?
Q: How can I use this on a machine without mouse, keyboard or screen? (input share, remote display)
Q: I integrated Dear ImGui in my engine and little squares are showing instead of text...
Q: I integrated Dear ImGui in my engine and some elements are clipping or disappearing when I move windows around...
Q: I integrated Dear ImGui in my engine and some elements are displaying outside their expected windows boundaries...
@ -848,7 +875,7 @@ CODE
- How can I have multiple widgets with the same label?
- How can I have multiple windows with the same label?
Q: How can I display an image? What is ImTextureID, how does it work?
Q: How can I use my own math types instead of ImVec2/ImVec4?
Q: How can I use my own math types instead of ImVec2?
Q: How can I interact with standard C++ types (such as std::string and std::vector)?
Q: How can I display custom shapes? (using low-level ImDrawList API)
>> See https://www.dearimgui.com/faq
@ -878,10 +905,10 @@ CODE
Q: How can I help?
A: - Businesses: please reach out to "contact AT dearimgui.com" if you work in a place using Dear ImGui!
We can discuss ways for your company to fund development via invoiced technical support, maintenance or sponsoring contacts.
This is among the most useful thing you can do for Dear ImGui. With increased funding, we can hire more people working on this project.
- Individuals: you can support continued development via PayPal donations. See README.
- If you are experienced with Dear ImGui and C++, look at the GitHub issues, look at the Wiki, read docs/TODO.txt
and see how you want to help and can help!
This is among the most useful thing you can do for Dear ImGui. With increased funding, we sustain and grow work on this project.
Also see https://github.com/ocornut/imgui/wiki/Sponsors
- Businesses: you can also purchase licenses for the Dear ImGui Automation/Test Engine.
- If you are experienced with Dear ImGui and C++, look at the GitHub issues, look at the Wiki, and see how you want to help and can help!
- Disclose your usage of Dear ImGui via a dev blog post, a tweet, a screenshot, a mention somewhere etc.
You may post screenshot or links in the gallery threads. Visuals are ideal as they inspire other programmers.
But even without visuals, disclosing your use of dear imgui helps the library grow credibility, and help other teams and programmers with taking decisions.

1
imgui.h
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@ -16,6 +16,7 @@
// - Getting Started https://github.com/ocornut/imgui/wiki/Getting-Started
// - Glossary https://github.com/ocornut/imgui/wiki/Glossary
// - Issues & support https://github.com/ocornut/imgui/issues
// - Tests & Automation https://github.com/ocornut/imgui_test_engine
// Getting Started?
// - Read https://github.com/ocornut/imgui/wiki/Getting-Started