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More consistently uses "Dear ImGui"

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imgui.cpp
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// (main code and documentation)
// See ImGui::ShowTestWindow() in imgui_demo.cpp for demo code.
// Newcomers, read 'Programmer guide' below for notes on how to setup ImGui in your codebase.
// Newcomers, read 'Programmer guide' below for notes on how to setup Dear ImGui in your codebase.
// Get latest version at https://github.com/ocornut/imgui
// Releases change-log at https://github.com/ocornut/imgui/releases
// Gallery (please post your screenshots/video there!): https://github.com/ocornut/imgui/issues/1269
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- END-USER GUIDE
- PROGRAMMER GUIDE (read me!)
- Read first
- How to update to a newer version of ImGui
- Getting started with integrating ImGui in your code/engine
- How to update to a newer version of Dear ImGui
- Getting started with integrating Dear ImGui in your code/engine
- API BREAKING CHANGES (read me when you update!)
- ISSUES & TODO LIST
- FREQUENTLY ASKED QUESTIONS (FAQ), TIPS
- How can I help?
- What is ImTextureID and how do I display an image?
- I integrated ImGui in my engine and the text or lines are blurry..
- I integrated ImGui in my engine and some elements are clipping or disappearing when I move windows around..
- I integrated Dear ImGui in my engine and the text or lines are blurry..
- I integrated Dear ImGui in my engine and some elements are clipping or disappearing when I move windows around..
- How can I have multiple widgets with the same label? Can I have widget without a label? (Yes). A primer on labels/IDs.
- How can I tell when ImGui wants my mouse/keyboard inputs VS when I can pass them to my application?
- How can I tell when Dear ImGui wants my mouse/keyboard inputs VS when I can pass them to my application?
- How can I load a different font than the default?
- How can I easily use icons in my application?
- How can I load multiple fonts?
- How can I display and input non-latin characters such as Chinese, Japanese, Korean, Cyrillic?
- How can I preserve my ImGui context across reloading a DLL? (loss of the global/static variables)
- How can I preserve my Dear ImGui context across reloading a DLL? (loss of the global/static variables)
- How can I use the drawing facilities without an ImGui window? (using ImDrawList API)
- ISSUES & TODO-LIST
- CODE
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- Call and read ImGui::ShowTestWindow() for demo code demonstrating most features.
- You can learn about immediate-mode gui principles at http://www.johno.se/book/imgui.html or watch http://mollyrocket.com/861
HOW TO UPDATE TO A NEWER VERSION OF IMGUI
HOW TO UPDATE TO A NEWER VERSION OF DEAR IMGUI
- Overwrite all the sources files except for imconfig.h (if you have made modification to your copy of imconfig.h)
- Read the "API BREAKING CHANGES" section (below). This is where we list occasional API breaking changes.
@ -98,26 +98,26 @@
Please report any issue to the GitHub page!
- Try to keep your copy of dear imgui reasonably up to date.
GETTING STARTED WITH INTEGRATING IMGUI IN YOUR CODE/ENGINE
GETTING STARTED WITH INTEGRATING DEAR IMGUI IN YOUR CODE/ENGINE
- Add the ImGui source files to your projects, using your preferred build system. It is recommended you build the .cpp files as part of your project and not as a library.
- Add the Dear ImGui source files to your projects, using your preferred build system. It is recommended you build the .cpp files as part of your project and not as a library.
- You can later customize the imconfig.h file to tweak some compilation time behavior, such as integrating imgui types with your own maths types.
- See examples/ folder for standalone sample applications. To understand the integration process, you can read examples/opengl2_example/ because it is short,
then switch to the one more appropriate to your use case.
- You may be able to grab and copy a ready made imgui_impl_*** file from the examples/.
- When using ImGui, your programming IDE if your friend: follow the declaration of variables, functions and types to find comments about them.
- When using Dear ImGui, your programming IDE if your friend: follow the declaration of variables, functions and types to find comments about them.
- Init: retrieve the ImGuiIO structure with ImGui::GetIO() and fill the fields marked 'Settings': at minimum you need to set io.DisplaySize (application resolution).
Later on you will fill your keyboard mapping, clipboard handlers, and other advanced features but for a basic integration you don't need to worry about it all.
- Init: call io.Fonts->GetTexDataAsRGBA32(...), it will build the font atlas texture, then load the texture pixels into graphics memory.
- Every frame:
- In your main loop as early a possible, fill the IO fields marked 'Input' (e.g. mouse position, buttons, keyboard info, etc.)
- Call ImGui::NewFrame() to begin the imgui frame
- Call ImGui::NewFrame() to begin the frame
- You can use any ImGui function you want between NewFrame() and Render()
- Call ImGui::Render() as late as you can to end the frame and finalize render data. it will call your io.RenderDrawListFn handler.
(if you don't need to render, you still need to call Render() and ignore the callback, or call EndFrame() instead. if you call neither some aspects of windows focusing/moving will appear broken.)
- All rendering information are stored into command-lists until ImGui::Render() is called.
- ImGui never touches or knows about your GPU state. the only function that knows about GPU is the RenderDrawListFn handler that you provide.
- Dear ImGui never touches or knows about your GPU state. the only function that knows about GPU is the RenderDrawListFn handler that you provide.
- Effectively it means you can create widgets at any time in your code, regardless of considerations of being in "update" vs "render" phases of your own application.
- Refer to the examples applications in the examples/ folder for instruction on how to setup your code.
- A minimal application skeleton may be:
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======================================
Q: How can I help?
A: - If you are experienced enough with ImGui and with C/C++, look at the todo list and see how you want/can help!
A: - If you are experienced enough with Dear ImGui and with C/C++, look at the todo list and see how you want/can help!
- Become a Patron/donate! Convince your company to become a Patron or provide serious funding for development time! See http://www.patreon.com/imgui
Q: What is ImTextureID and how do I display an image?
A: ImTextureID is a void* used to pass renderer-agnostic texture references around until it hits your render function.
ImGui knows nothing about what those bits represent, it just passes them around. It is up to you to decide what you want the void* to carry!
Dear ImGui knows nothing about what those bits represent, it just passes them around. It is up to you to decide what you want the void* to carry!
It could be an identifier to your OpenGL texture (cast GLuint to void*), a pointer to your custom engine material (cast MyMaterial* to void*), etc.
At the end of the chain, your renderer takes this void* to cast it back into whatever it needs to select a current texture to render.
Refer to examples applications, where each renderer (in a imgui_impl_xxxx.cpp file) is treating ImTextureID as a different thing.
(c++ tip: OpenGL uses integers to identify textures. You can safely store an integer into a void*, just cast it to void*, don't take it's address!)
To display a custom image/texture within an ImGui window, you may use ImGui::Image(), ImGui::ImageButton(), ImDrawList::AddImage() functions.
ImGui will generate the geometry and draw calls using the ImTextureID that you passed and which your renderer can use.
Dear ImGui will generate the geometry and draw calls using the ImTextureID that you passed and which your renderer can use.
It is your responsibility to get textures uploaded to your GPU.
Q: I integrated ImGui in my engine and the text or lines are blurry..
Q: I integrated Dear ImGui in my engine and the text or lines are blurry..
A: In your Render function, try translating your projection matrix by (0.5f,0.5f) or (0.375f,0.375f).
Also make sure your orthographic projection matrix and io.DisplaySize matches your actual framebuffer dimension.
Q: I integrated 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 clipping or disappearing when I move windows around..
A: Most likely you are mishandling the clipping rectangles in your render function. Rectangles provided by ImGui are defined as (x1=left,y1=top,x2=right,y2=bottom) and NOT as (x1,y1,width,height).
Q: Can I have multiple widgets with the same label? Can I have widget without a label?
A: Yes. A primer on the use of labels/IDs in ImGui..
A: Yes. A primer on the use of labels/IDs in Dear ImGui..
- Elements that are not clickable, such as Text() items don't need an ID.
- Interactive widgets require state to be carried over multiple frames (most typically ImGui often needs to remember what is the "active" widget).
- Interactive widgets require state to be carried over multiple frames (most typically Dear ImGui often needs to remember what is the "active" widget).
to do so they need a unique ID. unique ID are typically derived from a string label, an integer index or a pointer.
Button("OK"); // Label = "OK", ID = hash of "OK"
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e.g. when displaying a single object that may change over time (1-1 relationship), using a static string as ID will preserve your node open/closed state when the targeted object change.
e.g. when displaying a list of objects, using indices or pointers as ID will preserve the node open/closed state differently. experiment and see what makes more sense!
Q: How can I tell when ImGui wants my mouse/keyboard inputs VS when I can pass them to my application?
Q: How can I tell when Dear ImGui wants my mouse/keyboard inputs VS when I can pass them to my application?
A: You can read the 'io.WantCaptureMouse'/'io.WantCaptureKeyboard'/'ioWantTextInput' flags from the ImGuiIO structure.
- When 'io.WantCaptureMouse' or 'io.WantCaptureKeyboard' flags are set you may want to discard/hide the inputs from the rest of your application.
- When 'io.WantTextInput' is set to may want to notify your OS to popup an on-screen keyboard, if available (e.g. on a mobile phone, or console without a keyboard).
Preferably read the flags after calling ImGui::NewFrame() to avoid them lagging by one frame. But reading those flags before calling NewFrame() is also generally ok,
as the bool toggles fairly rarely and you don't generally expect to interact with either ImGui or your application during the same frame when that transition occurs.
ImGui is tracking dragging and widget activity that may occur outside the boundary of a window, so 'io.WantCaptureMouse' is more accurate and correct than checking if a window is hovered.
as the bool toggles fairly rarely and you don't generally expect to interact with either Dear ImGui or your application during the same frame when that transition occurs.
Dear ImGui is tracking dragging and widget activity that may occur outside the boundary of a window, so 'io.WantCaptureMouse' is more accurate and correct than checking if a window is hovered.
(Advanced note: text input releases focus on Return 'KeyDown', so the following Return 'KeyUp' event that your application receive will typically have 'io.WantCaptureKeyboard=false'.
Depending on your application logic it may or not be inconvenient. You might want to track which key-downs were for ImGui (e.g. with an array of bool) and filter out the corresponding key-ups.)
Depending on your application logic it may or not be inconvenient. You might want to track which key-downs were for Dear ImGui (e.g. with an array of bool) and filter out the corresponding key-ups.)
Q: How can I load a different font than the default? (default is an embedded version of ProggyClean.ttf, rendered at size 13)
A: Use the font atlas to load the TTF/OTF file you want:
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Text input: it is up to your application to pass the right character code to io.AddInputCharacter(). The applications in examples/ are doing that.
For languages using IME, on Windows you can copy the Hwnd of your application to io.ImeWindowHandle. The default implementation of io.ImeSetInputScreenPosFn() on Windows will set your IME position correctly.
Q: How can I preserve my ImGui context across reloading a DLL? (loss of the global/static variables)
Q: How can I preserve my Dear ImGui context across reloading a DLL? (loss of the global/static variables)
A: Create your own context 'ctx = CreateContext()' + 'SetCurrentContext(ctx)' and your own font atlas 'ctx->GetIO().Fonts = new ImFontAtlas()' so you don't rely on the default globals.
Q: How can I use the drawing facilities without an ImGui window? (using ImDrawList API)