Merge branch 'master' into viewport

# Conflicts:
#	examples/imgui_impl_dx10.cpp
#	examples/imgui_impl_dx10.h
#	examples/imgui_impl_dx11.cpp
#	examples/imgui_impl_glfw.cpp
#	examples/imgui_impl_glfw.h
#	examples/imgui_impl_opengl2.cpp
#	examples/imgui_impl_opengl2.h
#	examples/imgui_impl_opengl3.cpp
#	examples/imgui_impl_sdl.cpp
#	examples/imgui_impl_sdl.h
#	examples/imgui_impl_vulkan.h
#	examples/imgui_impl_win32.cpp

.travis.yml

@@ -26,6 +26,6 @@ before_install:
     fi
 
 script: 
-  - make -C examples/opengl2_example
-  - make -C examples/opengl3_example
-  - make -C examples/sdl_opengl3_example
+  - make -C examples/example_glfw_opengl2
+  - make -C examples/example_glfw_opengl3
+  - make -C examples/example_sdl_opengl3

CHANGELOG.txt

@@ -57,26 +57,30 @@ Other Changes:
      so you may study or grab one half of the code and not the other.
    - This change was motivated by the fact that adding support for the upcoming multi-viewport feature requires more work from the Platform and Renderer 
      back-ends, and the amount of redundancy across files was becoming too difficult to maintain. If you use default back-ends, you'll benefit from an 
-     easy update path to support multi-viewports later.
+     easy update path to support multi-viewports later (for future ImGui 1.7x).
    - This is not strictly a breaking change if you keep your old bindings, but when you'll want to fully update your bindings, 
      expect to have to reshuffle a few things. 
    - Each example still has its own main.cpp which you may refer you to understand how to initialize and glue everything together.
    - Some frameworks (such as the Allegro, Marmalade) handle both the "platform" and "rendering" part, and your custom engine may as well.
-   - Please read examples/README.txt for details.
- - Nav: To keep the navigated item in view we also attempt to scroll the parent window as well as the current window. (#787)
+   - Read examples/README.txt for details.
  - Nav: Added support for PageUp/PageDown (explorer-style: first aim at bottom/top most item, when scroll a page worth of contents). (#787)
+ - Nav: To keep the navigated item in view we also attempt to scroll the parent window as well as the current window. (#787)
  - TreeNode: Fixed nodes with ImGuiTreeNodeFlags_Leaf flag always returning true which was meaningless.
  - ColorEdit3, ColorEdit4, ColorButton: Added ImGuiColorEditFlags_NoDragDrop flag to disable ColorEditX as drag target and ColorButton as drag source. (#1826) 
  - BeginDragDropSource(): Offset tooltip position so it is off the mouse cursor, but also closer to it than regular tooltips, and not clamped by viewport. (#1739)
  - BeginDragDropTarget(): Added ImGuiDragDropFlags_AcceptNoPreviewTooltip flag to request hiding the drag source tooltip from the target site. (#143)
  - BeginCombo(), BeginMainMenuBar(), BeginChildFrame(): Temporary style modification are restored at the end of BeginXXX instead of EndXXX, to not affect tooltips and child windows.
- - Popup: Improved handling of (erroneously) repeating calls to OpenPopup() to not fully close/re-open the popup so its child popups won't get closed. (#1497, #1533, #1865).
+ - Popup: Improved handling of (erroneously) repeating calls to OpenPopup() to not close the popup's child popups. (#1497, #1533, #1865).
  - InputTextMultiline(): Fixed double navigation highlight when scrollbar is active. (#787)
- - InputText(): Fixed Undo after pasting large amount of text (Redo will still fail when undo buffers are exhausted, but text won't be corrupted).
+ - InputText(): Fixed Undo corruption after pasting large amount of text (Redo will still fail when undo buffers are exhausted, but text won't be corrupted).
  - SliderFloat(): When using keyboard/gamepad and a zero precision format string (e.g. "%.0f"), always step in integer units. (#1866)
  - ImFontConfig: Added GlyphMinAdvanceX/GlyphMaxAdvanceX settings useful to make a font appears monospaced, particularly useful for icon fonts. (#1869)
  - ImFontAtlas: Added GetGlyphRangesChineseSimplifiedCommon() helper that returns a list of ~2500 most common Simplified Chinese characters. (#1859) [@JX-Master, @ocornut]
  - Examples: GLFW: Made it possible to Shutdown/Init the backend again (by reseting the time storage properly). (#1827) [@ice1000]
+ - Examples: Win32: Fixed handling of mouse wheel messages to support sub-unit scrolling messages (typically sent by track-pads). (#1874) [@zx64]  
+ - Examples: Added SDL+Vulkan example.
+ - Examples: Allegro5: Added support for ImGuiConfigFlags_NoMouseCursorChange flag.
+ - Examples: FreeGLUT: Added FreeGLUT bindings. Added FreeGLUT+OpenGL2 example. (#801)
  - Misc: Updated stb_textedit from 1.09 + patches to 1.12 + minor patches.
  - Internals: PushItemFlag() flags are inherited by BeginChild().
 

TODO.txt

@@ -295,7 +295,6 @@ It's mostly a bunch of personal notes, probably incomplete. Feel free to query i
  - misc: imgui_cpp: perhaps a misc/ header file with more friendly helper (e.g. type-infer versions of DragScalar, vector<> variants if appropriate for some functions).
 
  - backend: bgfx? https://gist.github.com/RichardGale/6e2b74bc42b3005e08397236e4be0fd0
- - backend: freeglut (#801, #795)
  - web/emscriptem: refactor some examples to facilitate integration with emscripten main loop system. (#1713, #336)
  - web/emscriptem: tweak OpenGL renderers to support OpenGL ES. (#1713, #336)
  - web/emscriptem: with refactored examples, we could provide a direct imgui_impl_emscripten platform layer (see eg. https://github.com/floooh/sokol-samples/blob/master/html5/imgui-emsc.cc#L42)

examples/README.txt

@@ -33,20 +33,14 @@ You can find binaries of some of those example applications at:
  MISC COMMENTS AND SUGGESTIONS
 ---------------------------------------
 
- - Newcomers, read 'PROGRAMMER GUIDE' in imgui.cpp for notes on how to setup ImGui in your codebase.
-
- - Please read the comments and instruction at the top of each file.
-
+ - Please read 'PROGRAMMER GUIDE' in imgui.cpp for notes on how to setup Dear ImGui in your codebase.
+   Please read the comments and instruction at the top of each file.
+   
  - If you are using of the backend provided here, so you can copy the imgui_impl_xxx.cpp/h files
    to your project and use them unmodified. Each imgui_impl_xxxx.cpp comes with its own individual
    ChangeLog at the top of the .cpp files, so if you want to update them later it will be easier to
    catch up with what changed.
 
- - To LEARN how to setup imgui, you may refer to 'opengl2_example/' because is the simplest one to read.
-   However, do NOT USE the OpenGL2 renderer if your code is using any modern GL3+ calls.
-   Mixing old fixed-pipeline OpenGL2 and modern OpenGL3+ is going to make everything more complicated.
-   Read comments below for details. If you are not sure, in doubt, use the OpenGL3 renderer.
-
  - Dear ImGui has 0 to 1 frame of lag for most behaviors, at 60 FPS your experience should be pleasant.
    However, consider that OS mouse cursors are typically drawn through a specific hardware accelerated path
    and will feel smoother than common GPU rendered contents (including Dear ImGui windows). 
@@ -55,8 +49,8 @@ You can find binaries of some of those example applications at:
    at 60 FPS will feel slow. It might be beneficial to the user experience to switch to a software rendered
    cursor only when an interactive drag is in progress. 
    Note that some setup or GPU drivers are likely to be causing extra lag depending on their settings.
-   If you are not sure who to blame if you feeling that dragging something is laggy, try to build an
-   application drawing a shape directly under the mouse cursor. 
+   If you feel that dragging windows feels laggy and you are not sure who to blame: try to build an 
+   application drawing a shape directly under the mouse cursor.
 
 
 ---------------------------------------
@@ -72,7 +66,7 @@ Most the example bindings are split in 2 parts:
    Examples: DirectX11 (imgui_impl_dx11.cpp), GL3 (imgui_impl_opengl3.cpp), Vulkan (imgui_impl_vulkan.cpp)
 
  - The example _applications_ usually combine 1 platform + 1 renderer binding to create a working program.
-   Examples: the directx11_example/ application combines imgui_impl_win32.cpp + imgui_impl_dx11.cpp.
+   Examples: the example_win32_directx11/ application combines imgui_impl_win32.cpp + imgui_impl_dx11.cpp.
 
  - Some bindings for higher level frameworks carry both "Platform" and "Renderer" parts in one file.
    This is the case for Allegro 5 (imgui_impl_allegro5.cpp), Marmalade (imgui_impl_marmalade5.cpp).
@@ -83,8 +77,8 @@ Most the example bindings are split in 2 parts:
    imgui_impl_xxxx files to fit under your coding style, consider that it is not necessary!
    In fact, if you are new to Dear ImGui, rewriting them will almost always be harder.
 
-   Example: your engine is built over Windows + DirectX11 but you have your own high-level rendering system 
-   layered over DirectX11.
+   Example: your engine is built over Windows + DirectX11 but you have your own high-level rendering 
+   system layered over DirectX11.
      Suggestion: step 1: try using imgui_impl_win32.cpp + imgui_impl_dx11.cpp first. 
      Once this work, _if_ you want you can replace the imgui_impl_dx11.cpp code with a custom renderer 
      using your own functions, etc. 
@@ -103,27 +97,28 @@ Most the example bindings are split in 2 parts:
    integration. It is also much more complicated and require more work to integrate correctly.
    If you are new to imgui and you are trying to integrate it into your application, first try to ignore
    everything related to Viewport and Platform Windows. You'll be able to come back to it later!
-   Note that if you decide to use unmodified imgui_impl_xxxx.cpp files, you will automatically benefit from 
-   improvements and fixes related to viewports and platform windows without extra work on your side.
+   Note that if you decide to use unmodified imgui_impl_xxxx.cpp files, you will automatically benefit
+   from improvements and fixes related to viewports and platform windows without extra work on your side.
    See 'ImGuiPlatformIO' for details.  
 
-List of officially maintained Platforms Bindings:
+List of Platforms Bindings in this repository:
 
-    imgui_impl_glfw.cpp
-    imgui_impl_sdl.cpp
-    imgui_impl_win32.cpp
+    imgui_impl_glfw.cpp       ; GLFW (Windows, macOS, Linux, etc.) http://www.glfw.org/
+    imgui_impl_sdl.cpp        ; SDL2 (Windows, macOS, Linux, iOS, Android) https://www.libsdl.org
+    imgui_impl_win32.cpp      ; Windows native API (Windows)
+    imgui_impl_freeglut.cpp   ; FreeGLUT (if you really miss the 90's)
 
-List of officially maintained Renderer Bindings:
+List of Renderer Bindings in this repository:
 
-    imgui_impl_dx9.cpp
-    imgui_impl_dx10.cpp
-    imgui_impl_dx11.cpp
-    imgui_impl_dx12.cpp
-    imgui_impl_opengl2.cpp
-    imgui_impl_opengl3.cpp
-    imgui_impl_vulkan.cpp
+    imgui_impl_dx9.cpp        ; DirectX9
+    imgui_impl_dx10.cpp       ; DirectX10
+    imgui_impl_dx11.cpp       ; DirectX11
+    imgui_impl_dx12.cpp       ; DirectX12 
+    imgui_impl_opengl2.cpp    ; OpenGL2 (legacy, fixed pipeline <- don't use with modern OpenGL context)
+    imgui_impl_opengl3.cpp    ; OpenGL3 (modern programmable pipeline)
+    imgui_impl_vulkan.cpp     ; Vulkan
 
-List of officially maintained high-level Frameworks Bindings (combine Platform + Renderer)
+List of high-level Frameworks Bindings in this repository: (combine Platform + Renderer)
 
     imgui_impl_allegro5.cpp
     imgui_impl_marmalade.cpp
@@ -133,7 +128,7 @@ Third-party framework, graphics API and languages bindings:
     https://github.com/ocornut/imgui/wiki/Links
 
     Languages: C, C#, ChaiScript, D, Go, Haxe, Java, Lua, Odin, Pascal, PureBasic, Python, Rust, Swift...
-    Frameworks: FreeGlut, Cinder, Cocos2d-x, Emscripten, SFML, GML/GameMaker Studio, Irrlicht, Ogre, 
+    Frameworks: Cinder, Cocos2d-x, Emscripten, SFML, GML/GameMaker Studio, Irrlicht, Ogre, 
     OpenSceneGraph, openFrameworks, LOVE, NanoRT, Nim Game Lib, Qt3d, SFML, Unreal Engine 4...
     Miscellaneous: Software Renderer, RemoteImgui, etc.
 
@@ -216,7 +211,7 @@ example_sdl_vulkan/
 example_apple/
     OSX & iOS example + OpenGL2.
     THIS EXAMPLE HAS NOT BEEN MAINTAINED PROPERLY AND NEEDS A MAINTAINER.
-    Consider using the opengl3_example/ instead.
+    Consider using the example_glfw_opengl3/ instead.
     On iOS, Using Synergy to access keyboard/mouse data from server computer.
     Synergy keyboard integration is rather hacky.
 
@@ -224,6 +219,10 @@ example_allegro5/
     Allegro 5 example.
     = main.cpp + imgui_impl_allegro5.cpp
 
+example_freeglut_opengl2/
+    FreeGLUT + OpenGL2.
+    = main.cpp + imgui_impl_freeglut.cpp + imgui_impl_opengl2.cpp
+
 example_marmalade/
     Marmalade example using IwGx.
     = main.cpp + imgui_impl_marmalade.cpp

examples/example_apple/README.md

@@ -6,7 +6,7 @@ THIS EXAMPLE HAS NOT BEEN MAINTAINED PROPERLY AND NEEDS A MAINTAINER.
 
 This example is the default XCode "OpenGL" example code, modified to support ImGui and [Synergy](http://synergy-project.org/) to share mouse/keyboard on an iOS device.
 
-It is a rather complex and messy example because of all of the faff required to get an XCode/iOS application running. Refer to the regular OpenGL examples if you want to learn about integrating ImGui. **The opengl3_example/ should also work on OS X and is much simpler.** This is an integration for iOS with Synergy.
+It is a rather complex and messy example because of all of the faff required to get an XCode/iOS application running. Refer to the regular OpenGL examples if you want to learn about integrating ImGui. **The code in example_glfw_opengl3/ should also work on OS X and is much simpler.** This is an integration for iOS with Synergy.
 
 Synergy (remote keyboard/mouse) is not required, but it's pretty hard to use ImGui without it. Synergy includes a "uSynergy" library that allows embedding a synergy client, this is what is used here. ImGui supports "TouchPadding", and this is enabled when Synergy is not active.
 

examples/example_apple/imguiex-ios/imgui_impl_ios.mm

@@ -610,7 +610,7 @@ void ImGui_ClipboardCallback(uSynergyCookie cookie, enum uSynergyClipboardFormat
 // This is the main rendering function that you have to implement and provide to ImGui (via setting up 'RenderDrawListsFn' in the ImGuiIO structure)
 // If text or lines are blurry when integrating ImGui in your engine:
 // - in your Render function, try translating your projection matrix by (0.5f,0.5f) or (0.375f,0.375f)
-// NOTE: this is copied pretty much entirely from the opengl3_example, with only minor changes for ES
+// NOTE: this is copied pretty much entirely from the example_glfw_opengl3, with only minor changes for ES
 static void ImGui_ImplIOS_RenderDrawLists (ImDrawData *draw_data)
 {
     // Setup render state: alpha-blending enabled, no face culling, no depth testing, scissor enabled

examples/example_freeglut_opengl2/example_freeglut_opengl2.vcxproj

@@ -0,0 +1,174 @@
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@@ -0,0 +1,55 @@
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+      <Filter>imgui</Filter>
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+    <ClCompile Include="..\..\imgui_demo.cpp">
+      <Filter>imgui</Filter>
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examples/example_freeglut_opengl2/main.cpp

@@ -0,0 +1,133 @@
+// ImGui - standalone example application for FreeGLUT + OpenGL2, using legacy fixed pipeline
+// If you are new to ImGui, see examples/README.txt and documentation at the top of imgui.cpp.
+// (Using GLUT or FreeGLUT is not recommended unless you really miss the 90's)
+
+#include "imgui.h"
+#include "../imgui_impl_freeglut.h"
+#include "../imgui_impl_opengl2.h"
+#include <GL/freeglut.h>
+
+#ifdef _MSC_VER
+#pragma warning (disable: 4505) // unreferenced local function has been removed
+#endif
+
+static bool show_demo_window = true;
+static bool show_another_window = false;
+static ImVec4 clear_color = ImVec4(0.45f, 0.55f, 0.60f, 1.00f);
+
+void my_display_code()
+{
+    // 1. Show a simple window.
+    // Tip: if we don't call ImGui::Begin()/ImGui::End() the widgets automatically appears in a window called "Debug".
+    {
+        static float f = 0.0f;
+        static int counter = 0;
+        ImGui::Text("Hello, world!");                           // Display some text (you can use a format string too)
+        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
+
+        ImGui::Checkbox("Demo Window", &show_demo_window);      // Edit bools storing our windows open/close state
+        ImGui::Checkbox("Another Window", &show_another_window);
+
+        if (ImGui::Button("Button"))                            // Buttons return true when clicked (NB: most widgets return true when edited/activated)
+            counter++;
+        ImGui::SameLine();
+        ImGui::Text("counter = %d", counter);
+
+        ImGui::Text("Application average %.3f ms/frame (%.1f FPS)", 1000.0f / ImGui::GetIO().Framerate, ImGui::GetIO().Framerate);
+    }
+
+    // 2. Show another simple window. In most cases you will use an explicit Begin/End pair to name your windows.
+    if (show_another_window)
+    {
+        ImGui::Begin("Another Window", &show_another_window);
+        ImGui::Text("Hello from another window!");
+        if (ImGui::Button("Close Me"))
+            show_another_window = false;
+        ImGui::End();
+    }
+
+    // 3. Show the ImGui demo window. Most of the sample code is in ImGui::ShowDemoWindow(). Read its code to learn more about Dear ImGui!
+    if (show_demo_window)
+    {
+        ImGui::SetNextWindowPos(ImVec2(650, 20), ImGuiCond_FirstUseEver); // Normally user code doesn't need/want to call this because positions are saved in .ini file anyway. Here we just want to make the demo initial state a bit more friendly!
+        ImGui::ShowDemoWindow(&show_demo_window);
+    }
+}
+
+void glut_display_func()
+{
+    ImGui_ImplOpenGL2_NewFrame();
+    ImGui_ImplFreeGLUT_NewFrame();
+
+    my_display_code();
+
+    ImGui::Render();
+
+    ImGuiIO& io = ImGui::GetIO();
+    glViewport(0, 0, (GLsizei)io.DisplaySize.x, (GLsizei)io.DisplaySize.y);
+    glClearColor(clear_color.x, clear_color.y, clear_color.z, clear_color.w);
+    glClear(GL_COLOR_BUFFER_BIT);
+    //glUseProgram(0); // You may want this if using this code in an OpenGL 3+ context where shaders may be bound, but prefer using the GL3+ code.
+    ImGui_ImplOpenGL2_RenderDrawData(ImGui::GetDrawData());
+
+    glutSwapBuffers();
+    glutPostRedisplay();
+}
+
+// You can read the io.WantCaptureMouse, io.WantCaptureKeyboard flags to tell if dear imgui wants to use your inputs.
+// - When io.WantCaptureMouse is true, do not dispatch mouse input data to your main application.
+// - When io.WantCaptureKeyboard is true, do not dispatch keyboard input data to your main application.
+// Generally you may always pass all inputs to dear imgui, and hide them from your application based on those two flags.
+
+int main(int argc, char** argv)
+{ 
+    // Create GLUT window
+    glutInit(&argc, argv);
+    glutSetOption(GLUT_ACTION_ON_WINDOW_CLOSE, GLUT_ACTION_GLUTMAINLOOP_RETURNS);
+    glutInitDisplayMode(GLUT_RGBA | GLUT_DOUBLE | GLUT_MULTISAMPLE);
+    glutInitWindowSize(1280, 720);
+    glutCreateWindow("ImGui FreeGLUT+OpenGL2 Example");
+
+    // Setup GLUT display function
+    // We will also call ImGui_ImplFreeGLUT_InstallFuncs() to get all the other functions installed for us, 
+    // otherwise it is possible to install our own functions and call the imgui_impl_freeglut.h functions ourselves.
+    glutDisplayFunc(glut_display_func);
+
+    // Setup ImGui binding
+    ImGui::CreateContext();
+    ImGuiIO& io = ImGui::GetIO(); (void)io;
+    //io.ConfigFlags |= ImGuiConfigFlags_NavEnableKeyboard;  // Enable Keyboard Controls
+
+    ImGui_ImplFreeGLUT_Init();
+    ImGui_ImplFreeGLUT_InstallFuncs();
+    ImGui_ImplOpenGL2_Init();
+
+    // Setup style
+    ImGui::StyleColorsDark();
+    //ImGui::StyleColorsClassic();
+
+    // Load Fonts
+    // - If no fonts are loaded, dear imgui will use the default font. You can also load multiple fonts and use ImGui::PushFont()/PopFont() to select them. 
+    // - AddFontFromFileTTF() will return the ImFont* so you can store it if you need to select the font among multiple. 
+    // - If the file cannot be loaded, the function will return NULL. Please handle those errors in your application (e.g. use an assertion, or display an error and quit).
+    // - The fonts will be rasterized at a given size (w/ oversampling) and stored into a texture when calling ImFontAtlas::Build()/GetTexDataAsXXXX(), which ImGui_ImplXXXX_NewFrame below will call.
+    // - Read 'misc/fonts/README.txt' for more instructions and details.
+    // - Remember that in C/C++ if you want to include a backslash \ in a string literal you need to write a double backslash \\ !
+    //io.Fonts->AddFontDefault();
+    //io.Fonts->AddFontFromFileTTF("../../misc/fonts/Roboto-Medium.ttf", 16.0f);
+    //io.Fonts->AddFontFromFileTTF("../../misc/fonts/Cousine-Regular.ttf", 15.0f);
+    //io.Fonts->AddFontFromFileTTF("../../misc/fonts/DroidSans.ttf", 16.0f);
+    //io.Fonts->AddFontFromFileTTF("../../misc/fonts/ProggyTiny.ttf", 10.0f);
+    //ImFont* font = io.Fonts->AddFontFromFileTTF("c:\\Windows\\Fonts\\ArialUni.ttf", 18.0f, NULL, io.Fonts->GetGlyphRangesJapanese());
+    //IM_ASSERT(font != NULL);
+
+    glutMainLoop();
+
+    // Cleanup
+    ImGui_ImplOpenGL2_Shutdown();
+    ImGui_ImplFreeGLUT_Shutdown();
+    ImGui::DestroyContext();
+
+    return 0;
+}

examples/example_glfw_opengl2/main.cpp

@@ -3,7 +3,7 @@
 // (GLFW is a cross-platform general purpose library for handling windows, inputs, OpenGL/Vulkan graphics context creation, etc.)
 
 // **DO NOT USE THIS CODE IF YOUR CODE/ENGINE IS USING MODERN OPENGL (SHADERS, VBO, VAO, etc.)**
-// **Prefer using the code in the opengl3_example/ folder**
+// **Prefer using the code in the example_glfw_opengl2/ folder**
 // See imgui_impl_glfw.cpp for details.
 
 #include "imgui.h"

examples/example_glfw_opengl3/main.cpp

@@ -7,7 +7,8 @@
 #include "imgui_impl_glfw.h"
 #include "imgui_impl_opengl3.h"
 #include <stdio.h>
-#include <GL/gl3w.h>    // This example is using gl3w to access OpenGL functions (because it is small). You may use glew/glad/glLoadGen/etc. whatever already works for you.
+#include <GL/gl3w.h>    // This example is using gl3w to access OpenGL functions. You may freely use any other OpenGL loader such as: glew, glad, glLoadGen, etc.
+//#include <glew.h>
 #include <GLFW/glfw3.h>
 
 static void glfw_error_callback(int error, const char* description)

examples/example_sdl_opengl2/main.cpp

@@ -3,7 +3,7 @@
 // (SDL is a cross-platform general purpose library for handling windows, inputs, OpenGL/Vulkan graphics context creation, etc.)
 
 // **DO NOT USE THIS CODE IF YOUR CODE/ENGINE IS USING MODERN OPENGL (SHADERS, VBO, VAO, etc.)**
-// **Prefer using the code in the sdl_opengl3_example/ folder**
+// **Prefer using the code in the example_sdl_opengl3/ folder**
 // See imgui_impl_sdl.cpp for details.
 
 #include "imgui.h"

examples/example_sdl_opengl3/main.cpp

@@ -7,7 +7,8 @@
 #include "imgui_impl_sdl.h"
 #include "imgui_impl_opengl3.h"
 #include <stdio.h>
-#include <GL/gl3w.h>    // This example is using gl3w to access OpenGL functions (because it is small). You may use glew/glad/glLoadGen/etc. whatever already works for you.
+#include <GL/gl3w.h>    // This example is using gl3w to access OpenGL functions. You may freely use any other OpenGL loader such as: glew, glad, glLoadGen, etc.
+//#include <glew.h>
 #include <SDL.h>
 
 int main(int, char**)

examples/example_win32_directx10/example_win32_directx10.vcxproj

@@ -20,7 +20,7 @@
   </ItemGroup>
   <PropertyGroup Label="Globals">
     <ProjectGuid>{345A953E-A004-4648-B442-DC5F9F11068C}</ProjectGuid>
-    <RootNamespace>directx10_example</RootNamespace>
+    <RootNamespace>example_win32_directx10</RootNamespace>
   </PropertyGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.Default.props" />
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'" Label="Configuration">

examples/example_win32_directx12/example_win32_directx12.vcxproj

@@ -20,7 +20,7 @@
   </ItemGroup>
   <PropertyGroup Label="Globals">
     <ProjectGuid>{b4cf9797-519d-4afe-a8f4-5141a6b521d3}</ProjectGuid>
-    <RootNamespace>directx12_example</RootNamespace>
+    <RootNamespace>example_win32_directx12</RootNamespace>
     <WindowsTargetPlatformVersion>10.0.16299.0</WindowsTargetPlatformVersion>
   </PropertyGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.Default.props" />

examples/imgui_impl_allegro5.cpp

@@ -2,9 +2,11 @@
 // (Info: Allegro 5 is a cross-platform general purpose library for handling windows, inputs, graphics, etc.)
 
 // Implemented features:
-//  [X] User texture binding. Use 'ALLEGRO_BITMAP*' as ImTextureID. Read the FAQ about ImTextureID in imgui.cpp.
-// Missing features:
-//  [ ] Clipboard support via al_set_clipboard_text/al_clipboard_has_text.
+//  [X] Renderer: User texture binding. Use 'ALLEGRO_BITMAP*' as ImTextureID. Read the FAQ about ImTextureID in imgui.cpp.
+//  [X] Platform: Mouse cursor shape and visibility. Disable with 'io.ConfigFlags |= ImGuiConfigFlags_NoMouseCursorChange'.
+// Issues:
+//  [ ] Renderer: The renderer is suboptimal as we need to convert vertices.
+//  [ ] Platform: Clipboard support via al_set_clipboard_text/al_clipboard_has_text.
 
 // You can copy and use unmodified imgui_impl_* files in your project. See main.cpp for an example of using this.
 // If you use this binding you'll need to call 4 functions: ImGui_ImplXXXX_Init(), ImGui_ImplXXXX_NewFrame(), ImGui::Render() and ImGui_ImplXXXX_Shutdown().
@@ -13,6 +15,7 @@
 
 // CHANGELOG
 // (minor and older changes stripped away, please see git history for details)
+//  2018-06-11: Misc: Setup io.BackendFlags ImGuiBackendFlags_HasMouseCursors flag + honor ImGuiConfigFlags_NoMouseCursorChange flag.
 //  2018-04-18: Misc: Renamed file from imgui_impl_a5.cpp to imgui_impl_allegro5.cpp.
 //  2018-04-18: Misc: Added support for 32-bits vertex indices to avoid conversion at runtime. Added imconfig_allegro5.h to enforce 32-bit indices when included from imgui.h.
 //  2018-02-16: Misc: Obsoleted the io.RenderDrawListsFn callback and exposed ImGui_ImplAllegro5_RenderDrawData() in the .h file so you can call it yourself.
@@ -175,6 +178,10 @@ bool ImGui_ImplAllegro5_Init(ALLEGRO_DISPLAY* display)
 {
     g_Display = display;
 
+    // Setup back-end capabilities flags
+    ImGuiIO& io = ImGui::GetIO();
+    io.BackendFlags |= ImGuiBackendFlags_HasMouseCursors;       // We can honor GetMouseCursor() values (optional)
+
     // Create custom vertex declaration.
     // Unfortunately Allegro doesn't support 32-bits packed colors so we have to convert them to 4 floats.
     // We still use a custom declaration to use 'ALLEGRO_PRIM_TEX_COORD' instead of 'ALLEGRO_PRIM_TEX_COORD_PIXEL' else we can't do a reliable conversion.
@@ -187,7 +194,6 @@ bool ImGui_ImplAllegro5_Init(ALLEGRO_DISPLAY* display)
     };
     g_VertexDecl = al_create_vertex_decl(elems, sizeof(ImDrawVertAllegro));
 
-    ImGuiIO& io = ImGui::GetIO();
     io.KeyMap[ImGuiKey_Tab] = ALLEGRO_KEY_TAB;
     io.KeyMap[ImGuiKey_LeftArrow] = ALLEGRO_KEY_LEFT;
     io.KeyMap[ImGuiKey_RightArrow] = ALLEGRO_KEY_RIGHT;
@@ -224,7 +230,7 @@ void ImGui_ImplAllegro5_Shutdown()
 // Generally you may always pass all inputs to dear imgui, and hide them from your application based on those two flags.
 bool ImGui_ImplAllegro5_ProcessEvent(ALLEGRO_EVENT *ev)
 {
-    ImGuiIO &io = ImGui::GetIO();
+    ImGuiIO& io = ImGui::GetIO();
 
     switch (ev->type)
     {
@@ -246,6 +252,34 @@ bool ImGui_ImplAllegro5_ProcessEvent(ALLEGRO_EVENT *ev)
     return false;
 }
 
+static void ImGui_ImplAllegro5_UpdateMouseCursor()
+{
+    ImGuiIO& io = ImGui::GetIO();
+    if (io.ConfigFlags & ImGuiConfigFlags_NoMouseCursorChange)
+        return;
+
+    ImGuiMouseCursor imgui_cursor = ImGui::GetMouseCursor();
+    if (io.MouseDrawCursor || imgui_cursor == ImGuiMouseCursor_None)
+    {
+        // Hide OS mouse cursor if imgui is drawing it or if it wants no cursor
+        al_set_mouse_cursor(g_Display, g_MouseCursorInvisible);
+    }
+    else
+    {
+        ALLEGRO_SYSTEM_MOUSE_CURSOR cursor_id = ALLEGRO_SYSTEM_MOUSE_CURSOR_DEFAULT;
+        switch (imgui_cursor)
+        {
+        case ImGuiMouseCursor_TextInput:    cursor_id = ALLEGRO_SYSTEM_MOUSE_CURSOR_EDIT; break;
+        case ImGuiMouseCursor_ResizeAll:    cursor_id = ALLEGRO_SYSTEM_MOUSE_CURSOR_MOVE; break;
+        case ImGuiMouseCursor_ResizeNS:     cursor_id = ALLEGRO_SYSTEM_MOUSE_CURSOR_RESIZE_N; break;
+        case ImGuiMouseCursor_ResizeEW:     cursor_id = ALLEGRO_SYSTEM_MOUSE_CURSOR_RESIZE_E; break;
+        case ImGuiMouseCursor_ResizeNESW:   cursor_id = ALLEGRO_SYSTEM_MOUSE_CURSOR_RESIZE_NE; break;
+        case ImGuiMouseCursor_ResizeNWSE:   cursor_id = ALLEGRO_SYSTEM_MOUSE_CURSOR_RESIZE_NW; break;
+        }
+        al_set_system_mouse_cursor(g_Display, cursor_id);
+    }
+}
+
 void ImGui_ImplAllegro5_NewFrame()
 {
     if (!g_Texture)
@@ -288,23 +322,5 @@ void ImGui_ImplAllegro5_NewFrame()
     io.MouseDown[1] = mouse.buttons & (1 << 1);
     io.MouseDown[2] = mouse.buttons & (1 << 2);
 
-    // Hide OS mouse cursor if ImGui is drawing it
-    if (io.MouseDrawCursor)
-    {
-        al_set_mouse_cursor(g_Display, g_MouseCursorInvisible);
-    }
-    else
-    {
-        ALLEGRO_SYSTEM_MOUSE_CURSOR cursor_id = ALLEGRO_SYSTEM_MOUSE_CURSOR_DEFAULT;
-        switch (ImGui::GetMouseCursor())
-        {
-        case ImGuiMouseCursor_TextInput:    cursor_id = ALLEGRO_SYSTEM_MOUSE_CURSOR_EDIT; break;
-        case ImGuiMouseCursor_ResizeAll:    cursor_id = ALLEGRO_SYSTEM_MOUSE_CURSOR_MOVE; break;
-        case ImGuiMouseCursor_ResizeNS:     cursor_id = ALLEGRO_SYSTEM_MOUSE_CURSOR_RESIZE_N; break;
-        case ImGuiMouseCursor_ResizeEW:     cursor_id = ALLEGRO_SYSTEM_MOUSE_CURSOR_RESIZE_E; break;
-        case ImGuiMouseCursor_ResizeNESW:   cursor_id = ALLEGRO_SYSTEM_MOUSE_CURSOR_RESIZE_NE; break;
-        case ImGuiMouseCursor_ResizeNWSE:   cursor_id = ALLEGRO_SYSTEM_MOUSE_CURSOR_RESIZE_NW; break;
-        }
-        al_set_system_mouse_cursor(g_Display, cursor_id);
-    }
+    ImGui_ImplAllegro5_UpdateMouseCursor();
 }

examples/imgui_impl_allegro5.h

@@ -2,9 +2,11 @@
 // (Info: Allegro 5 is a cross-platform general purpose library for handling windows, inputs, graphics, etc.)
 
 // Implemented features:
-//  [X] User texture binding. Use 'ALLEGRO_BITMAP*' as ImTextureID. Read the FAQ about ImTextureID in imgui.cpp.
-// Missing features:
-//  [ ] Clipboard support via al_set_clipboard_text/al_clipboard_has_text.
+//  [X] Renderer: User texture binding. Use 'ALLEGRO_BITMAP*' as ImTextureID. Read the FAQ about ImTextureID in imgui.cpp.
+//  [X] Platform: Mouse cursor shape and visibility. Disable with 'io.ConfigFlags |= ImGuiConfigFlags_NoMouseCursorChange'.
+// Issues:
+//  [ ] Renderer: The renderer is suboptimal as we need to convert vertices.
+//  [ ] Platform: Missing clipboard support via al_set_clipboard_text/al_clipboard_has_text.
 
 // You can copy and use unmodified imgui_impl_* files in your project. See main.cpp for an example of using this.
 // If you use this binding you'll need to call 4 functions: ImGui_ImplXXXX_Init(), ImGui_ImplXXXX_NewFrame(), ImGui::Render() and ImGui_ImplXXXX_Shutdown().

examples/imgui_impl_dx10.cpp

@@ -2,8 +2,8 @@
 // This needs to be used along with a Platform Binding (e.g. Win32)
 
 // Implemented features:
-//  [X] User texture binding. Use 'ID3D10ShaderResourceView*' as ImTextureID. Read the FAQ about ImTextureID in imgui.cpp.
-//  [X] Multi-viewport rendering (when ImGuiConfigFlags_ViewportsEnable is enabled).
+//  [X] Renderer: User texture binding. Use 'ID3D10ShaderResourceView*' as ImTextureID. Read the FAQ about ImTextureID in imgui.cpp.
+//  [X] Renderer: Multi-viewport support. Enable with 'io.ConfigFlags |= ImGuiConfigFlags_ViewportsEnable'.
 
 // You can copy and use unmodified imgui_impl_* files in your project. See main.cpp for an example of using this.
 // If you use this binding you'll need to call 4 functions: ImGui_ImplXXXX_Init(), ImGui_ImplXXXX_NewFrame(), ImGui::Render() and ImGui_ImplXXXX_Shutdown().

examples/imgui_impl_dx10.h

@@ -2,8 +2,8 @@
 // This needs to be used along with a Platform Binding (e.g. Win32)
 
 // Implemented features:
-//  [X] User texture binding. Use 'ID3D10ShaderResourceView*' as ImTextureID. Read the FAQ about ImTextureID in imgui.cpp.
-//  [X] Multi-viewport rendering (when ImGuiConfigFlags_ViewportsEnable is enabled).
+//  [X] Renderer: User texture binding. Use 'ID3D10ShaderResourceView*' as ImTextureID. Read the FAQ about ImTextureID in imgui.cpp.
+//  [X] Renderer: Multi-viewport support. Enable with 'io.ConfigFlags |= ImGuiConfigFlags_ViewportsEnable'.
 
 // You can copy and use unmodified imgui_impl_* files in your project. See main.cpp for an example of using this.
 // If you use this binding you'll need to call 4 functions: ImGui_ImplXXXX_Init(), ImGui_ImplXXXX_NewFrame(), ImGui::Render() and ImGui_ImplXXXX_Shutdown().

examples/imgui_impl_dx11.cpp

@@ -2,8 +2,8 @@
 // This needs to be used along with a Platform Binding (e.g. Win32)
 
 // Implemented features:
-//  [X] User texture binding. Use 'ID3D11ShaderResourceView*' as ImTextureID. Read the FAQ about ImTextureID in imgui.cpp.
-//  [X] Multi-viewport rendering (when ImGuiConfigFlags_ViewportsEnable is enabled).
+//  [X] Renderer: User texture binding. Use 'ID3D11ShaderResourceView*' as ImTextureID. Read the FAQ about ImTextureID in imgui.cpp.
+//  [X] Renderer: Multi-viewport support. Enable with 'io.ConfigFlags |= ImGuiConfigFlags_ViewportsEnable'.
 
 // You can copy and use unmodified imgui_impl_* files in your project. See main.cpp for an example of using this.
 // If you use this binding you'll need to call 4 functions: ImGui_ImplXXXX_Init(), ImGui_ImplXXXX_NewFrame(), ImGui::Render() and ImGui_ImplXXXX_Shutdown().

examples/imgui_impl_dx11.h

@@ -2,8 +2,8 @@
 // This needs to be used along with a Platform Binding (e.g. Win32)
 
 // Implemented features:
-//  [X] User texture binding. Use 'ID3D11ShaderResourceView*' as ImTextureID. Read the FAQ about ImTextureID in imgui.cpp.
-//  [X] Multi-viewport rendering (when ImGuiConfigFlags_ViewportsEnable is enabled).
+//  [X] Renderer: User texture binding. Use 'ID3D11ShaderResourceView*' as ImTextureID. Read the FAQ about ImTextureID in imgui.cpp.
+//  [X] Renderer: Multi-viewport support. Enable with 'io.ConfigFlags |= ImGuiConfigFlags_ViewportsEnable'.
 
 // You can copy and use unmodified imgui_impl_* files in your project. See main.cpp for an example of using this.
 // If you use this binding you'll need to call 4 functions: ImGui_ImplXXXX_Init(), ImGui_ImplXXXX_NewFrame(), ImGui::Render() and ImGui_ImplXXXX_Shutdown().

examples/imgui_impl_dx12.cpp

@@ -2,7 +2,7 @@
 // FIXME: 64-bit only for now! (Because sizeof(ImTextureId) == sizeof(void*))
 
 // Implemented features:
-//  [X] User texture binding. Use 'D3D12_GPU_DESCRIPTOR_HANDLE' as ImTextureID. Read the FAQ about ImTextureID in imgui.cpp.
+//  [X] Renderer: User texture binding. Use 'D3D12_GPU_DESCRIPTOR_HANDLE' as ImTextureID. Read the FAQ about ImTextureID in imgui.cpp.
 
 // You can copy and use unmodified imgui_impl_* files in your project. See main.cpp for an example of using this.
 // If you use this binding you'll need to call 4 functions: ImGui_ImplXXXX_Init(), ImGui_ImplXXXX_NewFrame(), ImGui::Render() and ImGui_ImplXXXX_Shutdown().

examples/imgui_impl_dx12.h

@@ -2,7 +2,7 @@
 // FIXME: 64-bit only for now! (Because sizeof(ImTextureId) == sizeof(void*))
 
 // Implemented features:
-//  [X] User texture binding. Use 'D3D12_GPU_DESCRIPTOR_HANDLE' as ImTextureID. Read the FAQ about ImTextureID in imgui.cpp.
+//  [X] Renderer: User texture binding. Use 'D3D12_GPU_DESCRIPTOR_HANDLE' as ImTextureID. Read the FAQ about ImTextureID in imgui.cpp.
 
 // You can copy and use unmodified imgui_impl_* files in your project. See main.cpp for an example of using this.
 // If you use this binding you'll need to call 4 functions: ImGui_ImplXXXX_Init(), ImGui_ImplXXXX_NewFrame(), ImGui::Render() and ImGui_ImplXXXX_Shutdown().

examples/imgui_impl_dx9.cpp

@@ -2,7 +2,7 @@
 // This needs to be used along with a Platform Binding (e.g. Win32)
 
 // Implemented features:
-//  [X] User texture binding. Use 'LPDIRECT3DTEXTURE9' as ImTextureID. Read the FAQ about ImTextureID in imgui.cpp.
+//  [X] Renderer: User texture binding. Use 'LPDIRECT3DTEXTURE9' as ImTextureID. Read the FAQ about ImTextureID in imgui.cpp.
 
 // You can copy and use unmodified imgui_impl_* files in your project. See main.cpp for an example of using this.
 // If you use this binding you'll need to call 4 functions: ImGui_ImplXXXX_Init(), ImGui_ImplXXXX_NewFrame(), ImGui::Render() and ImGui_ImplXXXX_Shutdown().

examples/imgui_impl_dx9.h

@@ -2,7 +2,7 @@
 // This needs to be used along with a Platform Binding (e.g. Win32)
 
 // Implemented features:
-//  [X] User texture binding. Use 'LPDIRECT3DTEXTURE9' as ImTextureID. Read the FAQ about ImTextureID in imgui.cpp.
+//  [X] Renderer: User texture binding. Use 'LPDIRECT3DTEXTURE9' as ImTextureID. Read the FAQ about ImTextureID in imgui.cpp.
 
 // You can copy and use unmodified imgui_impl_* files in your project. See main.cpp for an example of using this.
 // If you use this binding you'll need to call 4 functions: ImGui_ImplXXXX_Init(), ImGui_ImplXXXX_NewFrame(), ImGui::Render() and ImGui_ImplXXXX_Shutdown().

examples/imgui_impl_freeglut.cpp

@@ -0,0 +1,188 @@
+// ImGui Platform Binding for: FreeGLUT
+// This needs to be used along with a Renderer (e.g. OpenGL2)
+
+// Issues:
+//  [ ] Platform: GLUT is unable to distinguish e.g. Backspace from CTRL+H or TAB from CTRL+I
+
+// You can copy and use unmodified imgui_impl_* files in your project. See main.cpp for an example of using this.
+// If you use this binding you'll need to call 4 functions: ImGui_ImplXXXX_Init(), ImGui_ImplXXXX_NewFrame(), ImGui::Render() and ImGui_ImplXXXX_Shutdown().
+// If you are new to ImGui, see examples/README.txt and documentation at the top of imgui.cpp.
+// https://github.com/ocornut/imgui
+
+// CHANGELOG
+// (minor and older changes stripped away, please see git history for details)
+//  2018-03-22: Added FreeGLUT Platform binding.
+
+#include "imgui.h"
+#include "imgui_impl_freeglut.h"
+#include <GL/freeglut.h>
+
+#ifdef _MSC_VER
+#pragma warning (disable: 4505) // unreferenced local function has been removed (stb stuff)
+#endif
+
+static int g_Time = 0;          // Current time, in milliseconds
+
+bool ImGui_ImplFreeGLUT_Init()
+{
+    ImGuiIO& io = ImGui::GetIO();
+    g_Time = 0;
+
+    // Glut has 1 function for characters and one for "special keys". We map the characters in the 0..255 range and the keys above.
+    io.KeyMap[ImGuiKey_Tab]         = '\t'; // == 9 == CTRL+I
+    io.KeyMap[ImGuiKey_LeftArrow]   = 256 + GLUT_KEY_LEFT;
+    io.KeyMap[ImGuiKey_RightArrow]  = 256 + GLUT_KEY_RIGHT;
+    io.KeyMap[ImGuiKey_UpArrow]     = 256 + GLUT_KEY_UP;
+    io.KeyMap[ImGuiKey_DownArrow]   = 256 + GLUT_KEY_DOWN;
+    io.KeyMap[ImGuiKey_PageUp]      = 256 + GLUT_KEY_PAGE_UP;
+    io.KeyMap[ImGuiKey_PageDown]    = 256 + GLUT_KEY_PAGE_DOWN;
+    io.KeyMap[ImGuiKey_Home]        = 256 + GLUT_KEY_HOME;
+    io.KeyMap[ImGuiKey_End]         = 256 + GLUT_KEY_END;
+    io.KeyMap[ImGuiKey_Insert]      = 256 + GLUT_KEY_INSERT;
+    io.KeyMap[ImGuiKey_Delete]      = 127;
+    io.KeyMap[ImGuiKey_Backspace]   = 8;  // == CTRL+H
+    io.KeyMap[ImGuiKey_Space]       = ' ';
+    io.KeyMap[ImGuiKey_Enter]       = 13; // == CTRL+M
+    io.KeyMap[ImGuiKey_Escape]      = 27;
+    io.KeyMap[ImGuiKey_A]           = 'A';
+    io.KeyMap[ImGuiKey_C]           = 'C';
+    io.KeyMap[ImGuiKey_V]           = 'V';
+    io.KeyMap[ImGuiKey_X]           = 'X';
+    io.KeyMap[ImGuiKey_Y]           = 'Y';
+    io.KeyMap[ImGuiKey_Z]           = 'Z';
+
+    return true;
+}
+
+void ImGui_ImplFreeGLUT_InstallFuncs()
+{
+    glutReshapeFunc(ImGui_ImplFreeGLUT_ReshapeFunc);
+    glutMotionFunc(ImGui_ImplFreeGLUT_MotionFunc);
+    glutPassiveMotionFunc(ImGui_ImplFreeGLUT_MotionFunc);
+    glutMouseFunc(ImGui_ImplFreeGLUT_MouseFunc);
+    glutMouseWheelFunc(ImGui_ImplFreeGLUT_MouseWheelFunc);
+    glutKeyboardFunc(ImGui_ImplFreeGLUT_KeyboardFunc);
+    glutKeyboardUpFunc(ImGui_ImplFreeGLUT_KeyboardUpFunc);
+    glutSpecialFunc(ImGui_ImplFreeGLUT_SpecialFunc);
+    glutSpecialUpFunc(ImGui_ImplFreeGLUT_SpecialUpFunc);
+}
+
+void ImGui_ImplFreeGLUT_Shutdown()
+{
+}
+
+void ImGui_ImplFreeGLUT_NewFrame()
+{
+    // Setup time step
+    ImGuiIO& io = ImGui::GetIO();
+    int current_time = glutGet(GLUT_ELAPSED_TIME);
+    io.DeltaTime = (current_time - g_Time) / 1000.0f;
+    g_Time = current_time;
+
+    // Start the frame
+    ImGui::NewFrame();
+}
+
+static void ImGui_ImplFreeGLUT_UpdateKeyboardMods()
+{
+    ImGuiIO& io = ImGui::GetIO();
+    int mods = glutGetModifiers();
+    io.KeyCtrl = (mods & GLUT_ACTIVE_CTRL) != 0;
+    io.KeyShift = (mods & GLUT_ACTIVE_SHIFT) != 0;
+    io.KeyAlt = (mods & GLUT_ACTIVE_ALT) != 0;
+}
+
+void ImGui_ImplFreeGLUT_KeyboardFunc(unsigned char c, int x, int y)
+{
+    // Send character to imgui
+    //printf("char_down_func %d '%c'\n", c, c);
+    ImGuiIO& io = ImGui::GetIO();
+    if (c >= 32)
+        io.AddInputCharacter(c);
+
+    // Store letters in KeysDown[] array as both uppercase and lowercase + Handle GLUT translating CTRL+A..CTRL+Z as 1..26. 
+    // This is a hacky mess but GLUT is unable to distinguish e.g. a TAB key from CTRL+I so this is probably the best we can do here.
+    if (c >= 1 && c <= 26)
+        io.KeysDown[c] = io.KeysDown[c - 1 + 'a'] = io.KeysDown[c - 1 + 'A'] = true;
+    else if (c >= 'a' && c <= 'z')
+        io.KeysDown[c] = io.KeysDown[c - 'a' + 'A'] = true;
+    else if (c >= 'A' && c <= 'Z')
+        io.KeysDown[c] = io.KeysDown[c - 'A' + 'a'] = true;
+    else
+        io.KeysDown[c] = true;
+    ImGui_ImplFreeGLUT_UpdateKeyboardMods();
+    (void)x; (void)y; // Unused
+}
+
+void ImGui_ImplFreeGLUT_KeyboardUpFunc(unsigned char c, int x, int y)
+{
+    //printf("char_up_func %d '%c'\n", c, c);
+    ImGuiIO& io = ImGui::GetIO();
+    if (c >= 1 && c <= 26)
+        io.KeysDown[c] = io.KeysDown[c - 1 + 'a'] = io.KeysDown[c - 1 + 'A'] = false;
+    else if (c >= 'a' && c <= 'z')
+        io.KeysDown[c] = io.KeysDown[c - 'a' + 'A'] = false;
+    else if (c >= 'A' && c <= 'Z')
+        io.KeysDown[c] = io.KeysDown[c - 'A' + 'a'] = false;
+    else
+        io.KeysDown[c] = false;
+    ImGui_ImplFreeGLUT_UpdateKeyboardMods();
+    (void)x; (void)y; // Unused
+}
+
+void ImGui_ImplFreeGLUT_SpecialFunc(int key, int x, int y)
+{
+    //printf("key_down_func %d\n", key);
+    ImGuiIO& io = ImGui::GetIO();
+    if (key + 256 < IM_ARRAYSIZE(io.KeysDown))
+        io.KeysDown[key + 256] = true;
+    ImGui_ImplFreeGLUT_UpdateKeyboardMods();
+    (void)x; (void)y; // Unused
+}
+
+void ImGui_ImplFreeGLUT_SpecialUpFunc(int key, int x, int y)
+{
+    //printf("key_up_func %d\n", key);
+    ImGuiIO& io = ImGui::GetIO();
+    if (key + 256 < IM_ARRAYSIZE(io.KeysDown))
+        io.KeysDown[key + 256] = false;
+    ImGui_ImplFreeGLUT_UpdateKeyboardMods();
+    (void)x; (void)y; // Unused
+}
+
+void ImGui_ImplFreeGLUT_MouseFunc(int glut_button, int state, int x, int y)
+{
+    ImGuiIO& io = ImGui::GetIO();
+    io.MousePos = ImVec2((float)x, (float)y);
+    int button = -1;
+    if (glut_button == GLUT_LEFT_BUTTON) button = 0;
+    if (glut_button == GLUT_RIGHT_BUTTON) button = 1;
+    if (glut_button == GLUT_MIDDLE_BUTTON) button = 2;
+    if (button != -1 && state == GLUT_DOWN)
+        io.MouseDown[button] = true;
+    if (button != -1 && state == GLUT_UP)
+        io.MouseDown[button] = false;
+}
+
+void ImGui_ImplFreeGLUT_MouseWheelFunc(int button, int dir, int x, int y)
+{
+    ImGuiIO& io = ImGui::GetIO();
+    io.MousePos = ImVec2((float)x, (float)y);
+    if (dir > 0)
+        io.MouseWheel += 1.0;
+    else if (dir < 0)
+        io.MouseWheel -= 1.0;
+    (void)button; // Unused
+}
+
+void ImGui_ImplFreeGLUT_ReshapeFunc(int w, int h)
+{
+    ImGuiIO& io = ImGui::GetIO();
+    io.DisplaySize = ImVec2((float)w, (float)h);
+}
+
+void ImGui_ImplFreeGLUT_MotionFunc(int x, int y)
+{
+    ImGuiIO& io = ImGui::GetIO();
+    io.MousePos = ImVec2((float)x, (float)y);
+}

examples/imgui_impl_freeglut.h

@@ -0,0 +1,27 @@
+// ImGui Platform Binding for: FreeGLUT
+// This needs to be used along with a Renderer (e.g. OpenGL2)
+
+// Issues:
+//  [ ] Platform: GLUT is unable to distinguish e.g. Backspace from CTRL+H or TAB from CTRL+I
+
+// You can copy and use unmodified imgui_impl_* files in your project. See main.cpp for an example of using this.
+// If you use this binding you'll need to call 4 functions: ImGui_ImplXXXX_Init(), ImGui_ImplXXXX_NewFrame(), ImGui::Render() and ImGui_ImplXXXX_Shutdown().
+// If you are new to ImGui, see examples/README.txt and documentation at the top of imgui.cpp.
+// https://github.com/ocornut/imgui
+
+IMGUI_API bool      ImGui_ImplFreeGLUT_Init();
+IMGUI_API void      ImGui_ImplFreeGLUT_InstallFuncs();
+IMGUI_API void      ImGui_ImplFreeGLUT_Shutdown();
+IMGUI_API void      ImGui_ImplFreeGLUT_NewFrame();
+
+// You can call ImGui_ImplFreeGLUT_InstallFuncs() to get all those functions installed automatically,
+// or call them yourself from your own GLUT handlers. We are using the same weird names as GLUT for consistency..
+//------------------------------------ GLUT name --------------------------------------------- Decent Name --------------
+IMGUI_API void      ImGui_ImplFreeGLUT_ReshapeFunc(int w, int h);                           // ~ ResizeFunc
+IMGUI_API void      ImGui_ImplFreeGLUT_MotionFunc(int x, int y);                            // ~ MouseMoveFunc
+IMGUI_API void      ImGui_ImplFreeGLUT_MouseFunc(int button, int state, int x, int y);      // ~ MouseButtonFunc
+IMGUI_API void      ImGui_ImplFreeGLUT_MouseWheelFunc(int button, int dir, int x, int y);   // ~ MouseWheelFunc
+IMGUI_API void      ImGui_ImplFreeGLUT_KeyboardFunc(unsigned char c, int x, int y);         // ~ CharPressedFunc
+IMGUI_API void      ImGui_ImplFreeGLUT_KeyboardUpFunc(unsigned char c, int x, int y);       // ~ CharReleasedFunc
+IMGUI_API void      ImGui_ImplFreeGLUT_SpecialFunc(int key, int x, int y);                  // ~ KeyPressedFunc
+IMGUI_API void      ImGui_ImplFreeGLUT_SpecialUpFunc(int key, int x, int y);                // ~ KeyReleasedFunc

examples/imgui_impl_glfw.cpp

@@ -3,8 +3,10 @@
 // (Info: GLFW is a cross-platform general purpose library for handling windows, inputs, OpenGL/Vulkan graphics context creation, etc.)
 
 // Implemented features:
-//  [X] Gamepad navigation mapping. Enable with 'io.ConfigFlags |= ImGuiConfigFlags_NavEnableGamepad'.
-//  [X] Multi-viewport windows (when ImGuiConfigFlags_ViewportsEnable is enabled).
+//  [X] Platform: Clipboard support.
+//  [X] Platform: Gamepad navigation mapping. Enable with 'io.ConfigFlags |= ImGuiConfigFlags_NavEnableGamepad'.
+//  [x] Platform: Mouse cursor shape and visibility. Disable with 'io.ConfigFlags |= ImGuiConfigFlags_NoMouseCursorChange'. FIXME: 3 cursors types are missing from GLFW.
+//  [X] Platform: Multi-viewport support (multiple windows). Enable with 'io.ConfigFlags |= ImGuiConfigFlags_ViewportsEnable'.
 
 // You can copy and use unmodified imgui_impl_* files in your project. See main.cpp for an example of using this.
 // If you use this binding you'll need to call 4 functions: ImGui_ImplXXXX_Init(), ImGui_ImplXXXX_NewFrame(), ImGui::Render() and ImGui_ImplXXXX_Shutdown().

examples/imgui_impl_glfw.h

@@ -3,8 +3,10 @@
 // (Info: GLFW is a cross-platform general purpose library for handling windows, inputs, OpenGL/Vulkan graphics context creation, etc.)
 
 // Implemented features:
-//  [X] Gamepad navigation mapping. Enable with 'io.ConfigFlags |= ImGuiConfigFlags_NavEnableGamepad'.
-//  [X] Multi-viewport windows (when ImGuiConfigFlags_ViewportsEnable is enabled).
+//  [X] Platform: Clipboard support.
+//  [X] Platform: Gamepad navigation mapping. Enable with 'io.ConfigFlags |= ImGuiConfigFlags_NavEnableGamepad'.
+//  [x] Platform: Mouse cursor shape and visibility. Disable with 'io.ConfigFlags |= ImGuiConfigFlags_NoMouseCursorChange'. FIXME: 3 cursors types are missing from GLFW.
+//  [X] Platform: Multi-viewport support (multiple windows). Enable with 'io.ConfigFlags |= ImGuiConfigFlags_ViewportsEnable'.
 
 // You can copy and use unmodified imgui_impl_* files in your project. See main.cpp for an example of using this.
 // If you use this binding you'll need to call 4 functions: ImGui_ImplXXXX_Init(), ImGui_ImplXXXX_NewFrame(), ImGui::Render() and ImGui_ImplXXXX_Shutdown().

examples/imgui_impl_marmalade.cpp

@@ -1,7 +1,7 @@
 // ImGui Renderer + Platform Binding for: Marmalade + IwGx
 
 // Implemented features:
-//  [X] User texture binding. Use 'CIwTexture*' as ImTextureID. Read the FAQ about ImTextureID in imgui.cpp.
+//  [X] Renderer: User texture binding. Use 'CIwTexture*' as ImTextureID. Read the FAQ about ImTextureID in imgui.cpp.
 
 // You can copy and use unmodified imgui_impl_* files in your project. See main.cpp for an example of using this.
 // If you use this binding you'll need to call 4 functions: ImGui_ImplXXXX_Init(), ImGui_ImplXXXX_NewFrame(), ImGui::Render() and ImGui_ImplXXXX_Shutdown().

examples/imgui_impl_marmalade.h

@@ -1,7 +1,7 @@
 // ImGui Renderer + Platform Binding for: Marmalade + IwGx
 
 // Implemented features:
-//  [X] User texture binding. Use 'CIwTexture*' as ImTextureID. Read the FAQ about ImTextureID in imgui.cpp.
+//  [X] Renderer: User texture binding. Use 'CIwTexture*' as ImTextureID. Read the FAQ about ImTextureID in imgui.cpp.
 
 // You can copy and use unmodified imgui_impl_* files in your project. See main.cpp for an example of using this.
 // If you use this binding you'll need to call 4 functions: ImGui_ImplXXXX_Init(), ImGui_ImplXXXX_NewFrame(), ImGui::Render() and ImGui_ImplXXXX_Shutdown().

examples/imgui_impl_opengl2.cpp

@@ -2,8 +2,8 @@
 // This needs to be used along with a Platform Binding (e.g. GLFW, SDL, Win32, custom..)
 
 // Implemented features:
-//  [X] User texture binding. Use 'GLUint' OpenGL texture identifier as void*/ImTextureID. Read the FAQ about ImTextureID in imgui.cpp.
-//  [X] Multi-viewport rendering (when ImGuiConfigFlags_ViewportsEnable is enabled).
+//  [X] Renderer: User texture binding. Use 'GLUint' OpenGL texture identifier as void*/ImTextureID. Read the FAQ about ImTextureID in imgui.cpp.
+//  [X] Renderer: Multi-viewport support. Enable with 'io.ConfigFlags |= ImGuiConfigFlags_ViewportsEnable'.
 
 // **DO NOT USE THIS CODE IF YOUR CODE/ENGINE IS USING MODERN OPENGL (SHADERS, VBO, VAO, etc.)**
 // **Prefer using the code in imgui_impl_opengl3.cpp**

examples/imgui_impl_opengl2.h

@@ -2,8 +2,8 @@
 // This needs to be used along with a Platform Binding (e.g. GLFW, SDL, Win32, custom..)
 
 // Implemented features:
-//  [X] User texture binding. Use 'GLUint' OpenGL texture identifier as void*/ImTextureID. Read the FAQ about ImTextureID in imgui.cpp.
-//  [X] Multi-viewport rendering (when ImGuiConfigFlags_ViewportsEnable is enabled).
+//  [X] Renderer: User texture binding. Use 'GLUint' OpenGL texture identifier as void*/ImTextureID. Read the FAQ about ImTextureID in imgui.cpp.
+//  [X] Renderer: Multi-viewport support. Enable with 'io.ConfigFlags |= ImGuiConfigFlags_ViewportsEnable'.
 
 // **DO NOT USE THIS CODE IF YOUR CODE/ENGINE IS USING MODERN OPENGL (SHADERS, VBO, VAO, etc.)**
 // **Prefer using the code in imgui_impl_opengl3.cpp**

examples/imgui_impl_opengl3.cpp

@@ -3,8 +3,8 @@
 // (Note: We are using GL3W as a helper library to access OpenGL functions since there is no standard header to access modern OpenGL functions easily. Alternatives are GLEW, Glad, etc..)
 
 // Implemented features:
-//  [X] User texture binding. Use 'GLUint' OpenGL texture identifier as void*/ImTextureID. Read the FAQ about ImTextureID in imgui.cpp.
-//  [X] Multi-viewport rendering (when ImGuiConfigFlags_ViewportsEnable is enabled).
+//  [X] Renderer: User texture binding. Use 'GLUint' OpenGL texture identifier as void*/ImTextureID. Read the FAQ about ImTextureID in imgui.cpp.
+//  [X] Renderer: Multi-viewport support. Enable with 'io.ConfigFlags |= ImGuiConfigFlags_ViewportsEnable'.
 
 // CHANGELOG 
 // (minor and older changes stripped away, please see git history for details)
@@ -29,7 +29,8 @@
 
 #include "imgui.h"
 #include "imgui_impl_opengl3.h"
-#include <GL/gl3w.h>  // This example is using gl3w to access OpenGL functions (because it is small). You may use glew/glad/glLoadGen/etc. whatever already works for you.
+#include <GL/gl3w.h>    // This example is using gl3w to access OpenGL functions. You may freely use any other OpenGL loader such as: glew, glad, glLoadGen, etc.
+//#include <glew.h>
 
 // OpenGL Data
 static char         g_GlslVersion[32] = "#version 150";

examples/imgui_impl_opengl3.h

@@ -3,8 +3,8 @@
 // (Note: We are using GL3W as a helper library to access OpenGL functions since there is no standard header to access modern OpenGL functions easily. Alternatives are GLEW, Glad, etc..)
 
 // Implemented features:
-//  [X] User texture binding. Use 'GLUint' OpenGL texture identifier as void*/ImTextureID. Read the FAQ about ImTextureID in imgui.cpp.
-//  [X] Multi-viewport rendering (when ImGuiConfigFlags_ViewportsEnable is enabled).
+//  [X] Renderer: User texture binding. Use 'GLUint' OpenGL texture identifier as void*/ImTextureID. Read the FAQ about ImTextureID in imgui.cpp.
+//  [X] Renderer: Multi-viewport support. Enable with 'io.ConfigFlags |= ImGuiConfigFlags_ViewportsEnable'.
 
 // About GLSL version:
 // The 'glsl_version' initialization parameter defaults to "#version 150" if NULL.

examples/imgui_impl_sdl.cpp

@@ -3,9 +3,11 @@
 // (Info: SDL2 is a cross-platform general purpose library for handling windows, inputs, graphics context creation, etc.)
 
 // Implemented features:
-//  [X] Multi-viewport windows (when ImGuiConfigFlags_ViewportsEnable is enabled).
+//  [X] Platform: Mouse cursor shape and visibility. Disable with 'io.ConfigFlags |= ImGuiConfigFlags_NoMouseCursorChange'.
+//  [X] Platform: Clipboard support.
+//  [X] Platform: Multi-viewport support (multiple windows). Enable with 'io.ConfigFlags |= ImGuiConfigFlags_ViewportsEnable'.
 // Missing features:
-//  [ ] SDL2 handling of IME under Windows appears to be broken and it explicitly disable the regular Windows IME. You can restore Windows IME by compiling SDL with SDL_DISABLE_WINDOWS_IME.
+//  [ ] Platform: SDL2 handling of IME under Windows appears to be broken and it explicitly disable the regular Windows IME. You can restore Windows IME by compiling SDL with SDL_DISABLE_WINDOWS_IME.
 
 // You can copy and use unmodified imgui_impl_* files in your project. See main.cpp for an example of using this.
 // If you use this binding you'll need to call 4 functions: ImGui_ImplXXXX_Init(), ImGui_ImplXXXX_NewFrame(), ImGui::Render() and ImGui_ImplXXXX_Shutdown().

examples/imgui_impl_sdl.h

@@ -3,9 +3,11 @@
 // (Info: SDL2 is a cross-platform general purpose library for handling windows, inputs, graphics context creation, etc.)
 
 // Implemented features:
-//  [X] Multi-viewport windows (when ImGuiConfigFlags_ViewportsEnable is enabled).
+//  [X] Platform: Mouse cursor shape and visibility. Disable with 'io.ConfigFlags |= ImGuiConfigFlags_NoMouseCursorChange'.
+//  [X] Platform: Clipboard support.
+//  [X] Platform: Multi-viewport support (multiple windows). Enable with 'io.ConfigFlags |= ImGuiConfigFlags_ViewportsEnable'.
 // Missing features:
-//  [ ] SDL2 handling of IME under Windows appears to be broken and it explicitly disable the regular Windows IME. You can restore Windows IME by compiling SDL with SDL_DISABLE_WINDOWS_IME.
+//  [ ] Platform: SDL2 handling of IME under Windows appears to be broken and it explicitly disable the regular Windows IME. You can restore Windows IME by compiling SDL with SDL_DISABLE_WINDOWS_IME.
 
 // You can copy and use unmodified imgui_impl_* files in your project. See main.cpp for an example of using this.
 // If you use this binding you'll need to call 4 functions: ImGui_ImplXXXX_Init(), ImGui_ImplXXXX_NewFrame(), ImGui::Render() and ImGui_ImplXXXX_Shutdown().

examples/imgui_impl_vulkan.cpp

@@ -2,7 +2,8 @@
 // This needs to be used along with a Platform Binding (e.g. GLFW, SDL, Win32, custom..)
 
 // Missing features:
-//  [ ] User texture binding. Changes of ImTextureID aren't supported by this binding! See https://github.com/ocornut/imgui/pull/914
+//  [ ] Platform: Multi-viewport / platform windows.
+//  [ ] Renderer: User texture binding. Changes of ImTextureID aren't supported by this binding! See https://github.com/ocornut/imgui/pull/914
 
 // You can copy and use unmodified imgui_impl_* files in your project. See main.cpp for an example of using this.
 // If you use this binding you'll need to call 5 functions: ImGui_ImplXXXX_Init(), ImGui_ImplXXX_CreateFontsTexture(), ImGui_ImplXXXX_NewFrame(), ImGui_ImplXXXX_Render() and ImGui_ImplXXXX_Shutdown().

examples/imgui_impl_vulkan.h

@@ -2,8 +2,8 @@
 // This needs to be used along with a Platform Binding (e.g. GLFW, SDL, Win32, custom..)
 
 // Missing features:
-//  [ ] User texture binding. Changes of ImTextureID aren't supported by this binding! See https://github.com/ocornut/imgui/pull/914
-//  [ ] Multi-viewport rendering (when ImGuiConfigFlags_ViewportsEnable is enabled). WORK-IN-PROGRESS.
+//  [ ] Platform: Multi-viewport / platform windows.
+//  [ ] Renderer: User texture binding. Changes of ImTextureID aren't supported by this binding! See https://github.com/ocornut/imgui/pull/914
 
 // You can copy and use unmodified imgui_impl_* files in your project. See main.cpp for an example of using this.
 // If you use this binding you'll need to call 5 functions: ImGui_ImplXXXX_Init(), ImGui_ImplXXX_CreateFontsTexture(), ImGui_ImplXXXX_NewFrame(), ImGui_ImplXXXX_Render() and ImGui_ImplXXXX_Shutdown().

examples/imgui_impl_win32.cpp

@@ -1,6 +1,11 @@
 // ImGui Platform Binding for: Windows (standard windows API for 32 and 64 bits applications)
 // This needs to be used along with a Renderer (e.g. DirectX11, OpenGL3, Vulkan..)
 
+// Implemented features:
+//  [X] Platform: Clipboard support (for Win32 this is actually part of core imgui)
+//  [X] Platform: Mouse cursor shape and visibility. Disable with 'io.ConfigFlags |= ImGuiConfigFlags_NoMouseCursorChange'.
+//  [X] Platform: Multi-viewport support (multiple windows). Enable with 'io.ConfigFlags |= ImGuiConfigFlags_ViewportsEnable'.
+
 #include "imgui.h"
 #include "imgui_impl_win32.h"
 #define WIN32_LEAN_AND_MEAN
@@ -10,6 +15,7 @@
 // CHANGELOG
 // (minor and older changes stripped away, please see git history for details)
 //  2018-XX-XX: Platform: Added support for multiple windows via the ImGuiPlatformIO interface.
+//  2018-06-10: Inputs: Fixed handling of mouse wheel messages to support fine position messages (typically sent by track-pads).
 //  2018-06-08: Misc: Extracted imgui_impl_win32.cpp/.h away from the old combined DX9/DX10/DX11/DX12 examples.
 //  2018-03-20: Misc: Setup io.BackendFlags ImGuiBackendFlags_HasMouseCursors and ImGuiBackendFlags_HasSetMousePos flags + honor ImGuiConfigFlags_NoMouseCursorChange flag.
 //  2018-02-20: Inputs: Added support for mouse cursors (ImGui::GetMouseCursor() value and WM_SETCURSOR message handling).
@@ -251,10 +257,10 @@ IMGUI_API LRESULT ImGui_ImplWin32_WndProcHandler(HWND hwnd, UINT msg, WPARAM wPa
         return 0;
     }
     case WM_MOUSEWHEEL:
-        io.MouseWheel += GET_WHEEL_DELTA_WPARAM(wParam) > 0 ? +1.0f : -1.0f;
+        io.MouseWheel += (float)GET_WHEEL_DELTA_WPARAM(wParam) / (float)WHEEL_DELTA;
         return 0;
     case WM_MOUSEHWHEEL:
-        io.MouseWheelH += GET_WHEEL_DELTA_WPARAM(wParam) > 0 ? +1.0f : -1.0f;
+        io.MouseWheelH += (float)GET_WHEEL_DELTA_WPARAM(wParam) / (float)WHEEL_DELTA;
         return 0;
     case WM_KEYDOWN:
     case WM_SYSKEYDOWN:

examples/imgui_impl_win32.h

@@ -1,6 +1,11 @@
 // ImGui Platform Binding for: Windows (standard windows API for 32 and 64 bits applications)
 // This needs to be used along with a Renderer (e.g. DirectX11, OpenGL3, Vulkan..)
 
+// Implemented features:
+//  [X] Platform: Clipboard support (for Win32 this is actually part of core imgui)
+//  [X] Platform: Mouse cursor shape and visibility. Disable with 'io.ConfigFlags |= ImGuiConfigFlags_NoMouseCursorChange'.
+//  [X] Platform: Multi-viewport support (multiple windows). Enable with 'io.ConfigFlags |= ImGuiConfigFlags_ViewportsEnable'.
+
 IMGUI_API bool        ImGui_ImplWin32_Init(void* hwnd);
 IMGUI_API void        ImGui_ImplWin32_Shutdown();
 IMGUI_API void        ImGui_ImplWin32_NewFrame();

imgui.cpp

@@ -109,43 +109,33 @@
  GETTING STARTED WITH INTEGRATING DEAR IMGUI IN YOUR CODE/ENGINE
 
  - Run and study the examples and demo to get acquainted with the library.
- - Add the Dear ImGui source files to your projects, using your preferred build system.
+ - Add the Dear ImGui source files to your projects or 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.
  - You may be able to grab and copy a ready made imgui_impl_*** file from the examples/ folder.
  - When using Dear ImGui, your programming IDE is your friend: follow the declaration of variables, functions and types to find comments about them.
+ - Dear ImGui never touches or knows about your GPU state. The only function that knows about GPU is the draw function 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. All rendering informatioe are stored into command-lists that you will retrieve after calling ImGui::Render().
+ - Refer to the bindings and demo applications in the examples/ folder for instruction on how to setup your code.
 
- - 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 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.
-       (Even if you don't render, call Render() and ignore the callback, or call EndFrame() instead. Otherwise some features will break)
- - All rendering information are stored into command-lists until ImGui::Render() is called.
- - 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:
+ THIS IS HOW A SIMPLE APPLICATION MAY LOOK LIKE
 
      // Application init
+     // Create a context
      ImGui::CreateContext();
      ImGuiIO& io = ImGui::GetIO();
-     io.DisplaySize.x = 1920.0f;
-     io.DisplaySize.y = 1280.0f;
-     // TODO: Fill others settings of the io structure later.
+     // TODO: Fill optional settings of the io structure later.
+     // TODO: Load fonts if you don't want to use the default font.
 
-     // Load texture atlas (there is a default font so you don't need to care about choosing a font yet)
-     unsigned char* pixels;
+     // Build and load the texture atlas into a texture
+     unsigned char* pixels = NULL;
      int width, height;
      io.Fonts->GetTexDataAsRGBA32(&pixels, &width, &height);
-     // TODO: At this points you've got the texture data and you need to upload that your your graphic system:
-     MyTexture* texture = MyEngine::CreateTextureFromMemoryPixels(pixels, width, height, TEXTURE_TYPE_RGBA)
-     // TODO: Store your texture pointer/identifier (whatever your engine uses) in 'io.Fonts->TexID'. This will be passed back to your via the renderer.
+     // At this point you've got the texture data and you need to upload that your your graphic system:
+     MyTexture* texture = MyEngine::CreateTextureFromMemoryPixels(pixels, width, height, TEXTURE_TYPE_RGBA32)
+     // Store your texture pointer/identifier (in whatever formatyour engine uses) in 'io.Fonts->TexID'. 
+     // This will be passed back to your via the renderer. Read FAQ for details about ImTextureID.
      io.Fonts->TexID = (void*)texture;
 
      // Application main loop
@@ -154,18 +144,24 @@
         // Setup low-level inputs (e.g. on Win32, GetKeyboardState(), or write to those fields from your Windows message loop handlers, etc.)
         ImGuiIO& io = ImGui::GetIO();
         io.DeltaTime = 1.0f/60.0f;
-        io.MousePos = mouse_pos;
-        io.MouseDown[0] = mouse_button_0;
-        io.MouseDown[1] = mouse_button_1;
+        io.DisplaySize.x = 1920.0f;
+        io.DisplaySize.y = 1280.0f;
+        io.MousePos = my_mouse_pos;
+        io.MouseDown[0] = my_mouse_buttons[0];
+        io.MouseDown[1] = my_mouse_buttons[1];
 
         // Call NewFrame(), after this point you can use ImGui::* functions anytime
+        // (So you want to try calling Newframe() as early as you can in your mainloop to be able to use imgui everywhere)
         ImGui::NewFrame();
 
         // Most of your application code here
+        ImGui::Text("Hello, world!");
         MyGameUpdate(); // may use any ImGui functions, e.g. ImGui::Begin("My window"); ImGui::Text("Hello, world!"); ImGui::End();
         MyGameRender(); // may use any ImGui functions as well!
 
-        // Render & swap video buffers
+        // Render imgui, swap buffers
+        // (You want to try calling EndFrame/Render as late as you can, to be able to use imgui in your own game rendering code)
+        ImGui::EndFrame();
         ImGui::Render();
         MyImGuiRenderFunction(ImGui::GetDrawData());
         SwapBuffers();
@@ -174,13 +170,13 @@
      // Shutdown
      ImGui::DestroyContext();
 
+ THIS HOW A SIMPLE RENDERING FUNCTION MAY LOOK LIKE
 
- - A minimal render function skeleton may be:
-
-    void void MyRenderFunction(ImDrawData* draw_data)
+    void void MyImGuiRenderFunction(ImDrawData* draw_data)
     {
        // TODO: Setup render state: alpha-blending enabled, no face culling, no depth testing, scissor enabled
-       // TODO: Setup viewport, orthographic projection matrix
+       // TODO: Setup viewport using draw_data->DisplaySize
+       // TODO: Setup orthographic projection matrix cover draw_data->DisplayPos to draw_data->DisplayPos + draw_data->DisplaySize
        // TODO: Setup shader: vertex { float2 pos, float2 uv, u32 color }, fragment shader sample color from 1 texture, multiply by vertex color.
        for (int n = 0; n < draw_data->CmdListsCount; n++)
        {
@@ -199,10 +195,16 @@
                  // The vast majority of draw calls with use the imgui texture atlas, which value you have set yourself during initialization.
                  MyEngineBindTexture(pcmd->TextureId);
 
-                 // We are using scissoring to clip some objects. All low-level graphics API supports it.
-                 // If your engine doesn't support scissoring yet, you may ignore this at first. You will get some small glitches
-                 // (some elements visible outside their bounds) but you can fix that once everywhere else works!
-                 MyEngineScissor((int)pcmd->ClipRect.x, (int)pcmd->ClipRect.y, (int)(pcmd->ClipRect.z - pcmd->ClipRect.x), (int)(pcmd->ClipRect.w - pcmd->ClipRect.y));
+                 // We are using scissoring to clip some objects. All low-level graphics API should supports it.
+                 // - If your engine doesn't support scissoring yet, you may ignore this at first. You will get some small glitches
+                 //   (some elements visible outside their bounds) but you can fix that once everywhere else works!
+                 // - Clipping coordinates are provided in imgui coordinates space (from draw_data->DisplayPos to draw_data->DisplayPos + draw_data->DisplaySize)
+                 //   In a single viewport application, draw_data->DisplayPos will always be (0,0) and draw_data->DisplaySize will always be == io.DisplaySize.
+                 //   However, in the interest of supporting multi-viewport applications in the future, always subtract draw_data->DisplayPos from
+                 //   clipping bounds to convert them to your viewport space.
+                 // - Note that pcmd->ClipRect contains Min+Max bounds. Some graphics API may use Min+Max, other may use Min+Size (size being Max-Min)
+                 ImVec2 pos = draw_data->DisplayPos;
+                 MyEngineScissor((int)(pcmd->ClipRect.x - pos.x), (int)(pcmd->ClipRect.y - pos.y), (int)(pcmd->ClipRect.z - pos.x), (int)(pcmd->ClipRect.w - pos.y));
 
                  // Render 'pcmd->ElemCount/3' indexed triangles.
                  // By default the indices ImDrawIdx are 16-bits, you can change them to 32-bits if your engine doesn't support 16-bits indices.

imgui.h

@@ -510,7 +510,7 @@ namespace ImGui
     IMGUI_API bool          IsItemHovered(ImGuiHoveredFlags flags = 0);                         // is the last item hovered? (and usable, aka not blocked by a popup, etc.). See ImGuiHoveredFlags for more options.
     IMGUI_API bool          IsItemActive();                                                     // is the last item active? (e.g. button being held, text field being edited- items that don't interact will always return false)
     IMGUI_API bool          IsItemFocused();                                                    // is the last item focused for keyboard/gamepad navigation?
-    IMGUI_API bool          IsItemClicked(int mouse_button = 0);                                // is the last item clicked? (e.g. button/node just clicked on)
+    IMGUI_API bool          IsItemClicked(int mouse_button = 0);                                // is the last item clicked? (e.g. button/node just clicked on) == IsMouseClicked(0) && IsItemHovered()
     IMGUI_API bool          IsItemVisible();                                                    // is the last item visible? (aka not out of sight due to clipping/scrolling.)
     IMGUI_API bool          IsAnyItemHovered();
     IMGUI_API bool          IsAnyItemActive();