update imgui and implot

Author: epezent

3rdparty/imgui/examples/imgui_impl_glfw.cpp renamed to 3rdparty/imgui/backends/imgui_impl_glfw.cpp

@@ -1,4 +1,4 @@
-// dear imgui: Platform Binding for GLFW
+// dear imgui: Platform Backend for GLFW
 // This needs to be used along with a Renderer (e.g. OpenGL3, Vulkan..)
 // (Info: GLFW is a cross-platform general purpose library for handling windows, inputs, OpenGL/Vulkan graphics context creation, etc.)
 
@@ -9,26 +9,33 @@
 //  [X] Platform: Keyboard arrays indexed using GLFW_KEY_* codes, e.g. ImGui::IsKeyPressed(GLFW_KEY_SPACE).
 //  [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 are new to dear imgui, read examples/README.txt and read the documentation at the top of imgui.cpp.
-// https://github.com/ocornut/imgui
+// Issues:
+//  [ ] Platform: Multi-viewport support: ParentViewportID not honored, and so io.ConfigViewportsNoDefaultParent has no effect (minor).
+
+// You can copy and use unmodified imgui_impl_* files in your project. See examples/ folder for examples of using this.
+// If you are new to Dear ImGui, read documentation from the docs/ folder + read the top of imgui.cpp.
+// Read online: https://github.com/ocornut/imgui/tree/master/docs
 
 // About GLSL version:
 // The 'glsl_version' initialization parameter defaults to "#version 150" if NULL.
 // Only override if your GL version doesn't handle this GLSL version. Keep NULL if unsure!
 
 #pragma once
+#include "imgui.h"      // IMGUI_IMPL_API
 
 struct GLFWwindow;
+struct GLFWmonitor;
 
 IMGUI_IMPL_API bool     ImGui_ImplGlfw_InitForOpenGL(GLFWwindow* window, bool install_callbacks);
 IMGUI_IMPL_API bool     ImGui_ImplGlfw_InitForVulkan(GLFWwindow* window, bool install_callbacks);
 IMGUI_IMPL_API void     ImGui_ImplGlfw_Shutdown();
 IMGUI_IMPL_API void     ImGui_ImplGlfw_NewFrame();
 
-// InitXXX function with 'install_callbacks=true': install GLFW callbacks. They will call user's previously installed callbacks, if any.
-// InitXXX function with 'install_callbacks=false': do not install GLFW callbacks. You will need to call them yourself from your own GLFW callbacks.
+// GLFW callbacks
+// - When calling Init with 'install_callbacks=true': GLFW callbacks will be installed for you. They will call user's previously installed callbacks, if any.
+// - When calling Init with 'install_callbacks=false': GLFW callbacks won't be installed. You will need to call those function yourself from your own GLFW callbacks.
 IMGUI_IMPL_API void     ImGui_ImplGlfw_MouseButtonCallback(GLFWwindow* window, int button, int action, int mods);
 IMGUI_IMPL_API void     ImGui_ImplGlfw_ScrollCallback(GLFWwindow* window, double xoffset, double yoffset);
 IMGUI_IMPL_API void     ImGui_ImplGlfw_KeyCallback(GLFWwindow* window, int key, int scancode, int action, int mods);
 IMGUI_IMPL_API void     ImGui_ImplGlfw_CharCallback(GLFWwindow* window, unsigned int c);
+IMGUI_IMPL_API void     ImGui_ImplGlfw_MonitorCallback(GLFWmonitor* monitor, int event);

3rdparty/imgui/examples/imgui_impl_glfw.h renamed to 3rdparty/imgui/backends/imgui_impl_glfw.h

@@ -1,19 +1,19 @@
-// dear imgui: Renderer for modern OpenGL with shaders / programmatic pipeline
+// dear imgui: Renderer Backend for modern OpenGL with shaders / programmatic pipeline
 // - Desktop GL: 2.x 3.x 4.x
 // - Embedded GL: ES 2.0 (WebGL 1.0), ES 3.0 (WebGL 2.0)
-// This needs to be used along with a Platform Binding (e.g. GLFW, SDL, Win32, custom..)
+// This needs to be used along with a Platform Backend (e.g. GLFW, SDL, Win32, custom..)
 
 // Implemented features:
 //  [X] Renderer: User texture binding. Use 'GLuint' OpenGL texture identifier as void*/ImTextureID. Read the FAQ about ImTextureID!
 //  [X] Renderer: Multi-viewport support. Enable with 'io.ConfigFlags |= ImGuiConfigFlags_ViewportsEnable'.
 //  [x] Renderer: Desktop GL only: Support for large meshes (64k+ vertices) with 16-bit indices.
 
-// You can copy and use unmodified imgui_impl_* files in your project. See main.cpp for an example of using this.
-// If you are new to dear imgui, read examples/README.txt and read the documentation at the top of imgui.cpp.
-// https://github.com/ocornut/imgui
+// You can copy and use unmodified imgui_impl_* files in your project. See examples/ folder for examples of using this.
+// If you are new to Dear ImGui, read documentation from the docs/ folder + read the top of imgui.cpp.
+// Read online: https://github.com/ocornut/imgui/tree/master/docs
 
 // About Desktop OpenGL function loaders:
-//  Modern desktop OpenGL doesn't have a standard portable header file to load OpenGL function pointers.
+//  Modern Desktop OpenGL doesn't have a standard portable header file to load OpenGL function pointers.
 //  Helper libraries are often used for this purpose! Here we are supporting a few common ones (gl3w, glew, glad).
 //  You may use another loader/header of your choice (glext, glLoadGen, etc.), or chose to manually implement your own.
 
@@ -23,6 +23,7 @@
 //  Only override if your GL version doesn't handle this GLSL version. See GLSL version table at the top of imgui_impl_opengl3.cpp.
 
 #pragma once
+#include "imgui.h"      // IMGUI_IMPL_API
 
 // Backend API
 IMGUI_IMPL_API bool     ImGui_ImplOpenGL3_Init(const char* glsl_version = NULL);
@@ -36,33 +37,52 @@ IMGUI_IMPL_API void     ImGui_ImplOpenGL3_DestroyFontsTexture();
 IMGUI_IMPL_API bool     ImGui_ImplOpenGL3_CreateDeviceObjects();
 IMGUI_IMPL_API void     ImGui_ImplOpenGL3_DestroyDeviceObjects();
 
-// Specific OpenGL versions
+// Specific OpenGL ES versions
 //#define IMGUI_IMPL_OPENGL_ES2     // Auto-detected on Emscripten
 //#define IMGUI_IMPL_OPENGL_ES3     // Auto-detected on iOS/Android
 
-// Desktop OpenGL: attempt to detect default GL loader based on available header files.
+// Attempt to auto-detect the default Desktop GL loader based on available header files.
 // If auto-detection fails or doesn't select the same GL loader file as used by your application,
 // you are likely to get a crash in ImGui_ImplOpenGL3_Init().
-// You can explicitly select a loader by using '#define IMGUI_IMPL_OPENGL_LOADER_XXX' in imconfig.h or compiler command-line.
-#if !defined(IMGUI_IMPL_OPENGL_LOADER_GL3W) \
+// You can explicitly select a loader by using one of the '#define IMGUI_IMPL_OPENGL_LOADER_XXX' in imconfig.h or compiler command-line.
+#if !defined(IMGUI_IMPL_OPENGL_ES2) \
+ && !defined(IMGUI_IMPL_OPENGL_ES3) \
+ && !defined(IMGUI_IMPL_OPENGL_LOADER_GL3W) \
  && !defined(IMGUI_IMPL_OPENGL_LOADER_GLEW) \
  && !defined(IMGUI_IMPL_OPENGL_LOADER_GLAD) \
- && !defined(IMGUI_IMPL_OPENGL_LOADER_GLBINDING) \
+ && !defined(IMGUI_IMPL_OPENGL_LOADER_GLAD2) \
+ && !defined(IMGUI_IMPL_OPENGL_LOADER_GLBINDING2) \
+ && !defined(IMGUI_IMPL_OPENGL_LOADER_GLBINDING3) \
  && !defined(IMGUI_IMPL_OPENGL_LOADER_CUSTOM)
-    #if defined(__has_include)
-        #if __has_include(<GL/glew.h>)
-            #define IMGUI_IMPL_OPENGL_LOADER_GLEW
-        #elif __has_include(<glad/glad.h>)
-            #define IMGUI_IMPL_OPENGL_LOADER_GLAD
-        #elif __has_include(<GL/gl3w.h>)
-            #define IMGUI_IMPL_OPENGL_LOADER_GL3W
-        #elif __has_include(<glbinding/gl/gl.h>)
-            #define IMGUI_IMPL_OPENGL_LOADER_GLBINDING
-        #else
-            #error "Cannot detect OpenGL loader!"
-        #endif
-    #else
-        #define IMGUI_IMPL_OPENGL_LOADER_GL3W       // Default to GL3W
-    #endif
+
+// Try to detect GLES on matching platforms
+#if defined(__APPLE__)
+#include "TargetConditionals.h"
 #endif
+#if (defined(__APPLE__) && (TARGET_OS_IOS || TARGET_OS_TV)) || (defined(__ANDROID__))
+#define IMGUI_IMPL_OPENGL_ES3               // iOS, Android  -> GL ES 3, "#version 300 es"
+#elif defined(__EMSCRIPTEN__)
+#define IMGUI_IMPL_OPENGL_ES2               // Emscripten    -> GL ES 2, "#version 100"
 
+// Otherwise try to detect supported Desktop OpenGL loaders..
+#elif defined(__has_include)
+#if __has_include(<GL/glew.h>)
+    #define IMGUI_IMPL_OPENGL_LOADER_GLEW
+#elif __has_include(<glad/glad.h>)
+    #define IMGUI_IMPL_OPENGL_LOADER_GLAD
+#elif __has_include(<glad/gl.h>)
+    #define IMGUI_IMPL_OPENGL_LOADER_GLAD2
+#elif __has_include(<GL/gl3w.h>)
+    #define IMGUI_IMPL_OPENGL_LOADER_GL3W
+#elif __has_include(<glbinding/glbinding.h>)
+    #define IMGUI_IMPL_OPENGL_LOADER_GLBINDING3
+#elif __has_include(<glbinding/Binding.h>)
+    #define IMGUI_IMPL_OPENGL_LOADER_GLBINDING2
+#else
+    #error "Cannot detect OpenGL loader!"
+#endif
+#else
+    #define IMGUI_IMPL_OPENGL_LOADER_GL3W   // Default to GL3W embedded in our repository
+#endif
+
+#endif