Initial commit

.gitignore

@@ -0,0 +1,6 @@
+jack_editor
+jack_editor.exe
+*.o
+*.dll
+imgui.ini
+*.swp

Makefile

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+
+.SILENT:
+include Makefile.flags
+
+output := jack_editor
+
+objects      = $(patsubst %.c,%.o,$(shell find . -name "*.c")) $(patsubst %.cpp,%.o,$(shell find . -name "*.cpp"))
+objects_fasm = $(patsubst %.S,%.o,$(shell find . -name "*.S"))
+
+objects_test = $(patsubst %.c,%.o,$(shell find . -name "test_*.c")) $(patsubst %.cpp,%.o,$(shell find . -name "test_*.cpp"))
+objects     := $(filter-out $(objects_test),$(objects))
+
+
+all: $(output)
+
+
+$(output): $(objects) $(objects_fasm)
+	$(LD) -o $@ $(LDFLAGS) $(objects) $(objects_fasm) $(LDLIBS)
+
+
+clean:
+	echo " -RM    $(output) $(objects)"
+	-$(RM) -f $(output) $(objects) $(objects_fasm)
+
+
+.PHONY: all clean install upload
+
+

Makefile.flags

@@ -0,0 +1,49 @@
+
+.SILENT:
+
+
+FLAGS_DIR := $(dir $(lastword $(MAKEFILE_LIST)))
+SELF_DIR   = $(dir $@)
+
+export RM = rm
+export CP = cp
+
+export AR1 := $(AR)
+export AS1 := $(AS)
+export CC1 := $(CC)
+export CXX1 := $(CXX)
+export LD1 := $(CC)
+
+export AR   = echo "  AR    $<" && $(AR1)
+export AS   = echo "  AS    $^" && $(AS1)
+export CC   = echo "  CC    $^" && $(CC1)
+export CXX  = echo "  CXX   $^" && $(CXX1)
+export LD   = echo "  LD    $@" && $(LD1)
+export FASM = echo "  FASM  $^" && fasm >/dev/null
+
+
+# halt&cache fire if windows
+ifneq (, $(findstring mingw,$(shell $(CC1) -dumpmachine)))
+export Platform_CXXFLAGS      := -DSFML_STATIC
+export Platform_LDFLAGS       :=
+export Platform_LDLIBS        := -lgdi32 -limm32 -lwinmm
+export Platform_INCLUDEFLAGS  :=
+else
+export Platform_CXXFLAGS      :=
+export Platform_LDFLAGS       :=
+export Platform_LDLIBS        := -lGL
+export Platform_INCLUDEFLAGS  :=
+endif
+
+export INCLUDEFLAGS := $(Platform_INCLUDEFLAGS)
+
+export CPPFLAGS = -DIMGUI_USER_CONFIG=\"../imgui-sfml/imconfig-SFML.h\"
+export CFLAGS   = $(INCLUDEFLAGS) $(BUILD_OPTIONS) -O2 -Wno-attributes
+export CXXFLAGS = $(INCLUDEFLAGS) -DHELOS $(BUILD_OPTIONS) $(Platform_CXXFLAGS) -O2 -Wno-unused-result -std=c++17
+export LDFLAGS  = $(Platform_LDFLAGS) -s -O2
+export LDLIBS   = $(Platform_LDLIBS) -lsfml-graphics -lsfml-window -lsfml-system -lm -lstdc++
+
+# Pattern rule for FASM assembly
+%.o: %.S
+	$(FASM) $^ $@
+

gui/gui.cpp

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+
+#include "gui.hpp"
+#include <SFML/Window/VideoMode.hpp>
+#include "imgui-sfml/imgui-SFML.h"
+#include "imgui/imgui_internal.h"
+
+using namespace sf;
+
+
+UI::UI(sf::Vector2u size, std::string title): win(VideoMode(size.x, size.y), title) {
+	win.setFramerateLimit(200);
+	win.setVerticalSyncEnabled(true);
+
+	ig::SFML::Init(win, false);
+
+	auto        &io = ig::GetIO();
+	ImFontConfig cfg;
+	cfg.OversampleH = 1;
+	cfg.OversampleV = 1;
+	cfg.SizePixels  = 16;
+	io.Fonts->Clear();
+	io.Fonts->AddFontFromFileTTF("unifont.otf", 16, &cfg, io.Fonts->GetGlyphRangesChineseSimplifiedCommon());
+
+	ig::SFML::UpdateFontTexture();
+	win.resetGLStates();
+}
+
+UI::~UI() {
+	win.close();
+	ig::SFML::Shutdown();
+}
+
+
+bool UI::Update() {
+	Event e;
+	bool  closed = false;
+	while (win.pollEvent(e)) {
+		ig::SFML::ProcessEvent(e);
+
+		if (e.type == Event::Closed)
+			closed = true;
+	}
+
+	ig::SFML::Update(win, delta.restart());
+
+	return !closed;
+}
+
+void UI::Render() {
+	win.clear();
+	ig::SFML::Render(win);
+	win.display();
+}

gui/gui.hpp

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+#pragma once
+
+#include <SFML/Window.hpp>
+#include <SFML/Graphics.hpp>
+
+#include "imgui/imgui.h"
+#include "imgui-sfml/imgui-SFML.h"
+
+
+#define ig ImGui
+
+class UI {
+public:
+	UI(sf::Vector2u size, std::string title);
+	~UI();
+
+	// Process events, prepares ImGUI frame.
+	// Return false if window closed.
+	bool Update();
+
+
+	// Finishes a frame.
+	void Render();
+
+private:
+	sf::RenderWindow win;
+	sf::Clock        delta;
+	bool             running;
+};

gui/imgui-sfml/imconfig-SFML.h

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+// Add this to your imconfig.h
+
+#include <SFML/Graphics/Color.hpp>
+#include <SFML/System/Vector2.hpp>
+
+#include <cstdint>
+
+#include "imgui-SFML_export.h"
+
+#define IM_VEC2_CLASS_EXTRA           \
+    template<typename T>              \
+    ImVec2(const sf::Vector2<T>& v) { \
+        x = static_cast<float>(v.x);  \
+        y = static_cast<float>(v.y);  \
+    }                                 \
+                                      \
+    template<typename T>              \
+    operator sf::Vector2<T>() const { \
+        return sf::Vector2<T>(x, y);  \
+    }
+
+#define IM_VEC4_CLASS_EXTRA                                                                        \
+    ImVec4(const sf::Color& c) : x(c.r / 255.f), y(c.g / 255.f), z(c.b / 255.f), w(c.a / 255.f) {} \
+    operator sf::Color() const {                                                                   \
+        return sf::Color(static_cast<std::uint8_t>(x * 255.f),                                     \
+                         static_cast<std::uint8_t>(y * 255.f),                                     \
+                         static_cast<std::uint8_t>(z * 255.f),                                     \
+                         static_cast<std::uint8_t>(w * 255.f));                                    \
+    }

gui/imgui-sfml/imgui-SFML.h

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+#ifndef IMGUI_SFML_H
+#define IMGUI_SFML_H
+
+#include <SFML/Graphics/Color.hpp>
+#include <SFML/Graphics/Rect.hpp>
+#include <SFML/System/Time.hpp>
+#include <SFML/System/Vector2.hpp>
+#include <SFML/Window/Joystick.hpp>
+
+#include "imgui-SFML_export.h"
+
+#if __cplusplus >= 201703L // C++17 and above
+#define IMGUI_SFML_NODISCARD [[nodiscard]]
+#else
+#define IMGUI_SFML_NODISCARD
+#endif
+
+namespace sf {
+class Event;
+class RenderTarget;
+class RenderTexture;
+class RenderWindow;
+class Sprite;
+class Texture;
+class Window;
+}
+
+namespace ImGui {
+namespace SFML {
+IMGUI_SFML_NODISCARD IMGUI_SFML_API bool Init(sf::RenderWindow& window,
+                                              bool loadDefaultFont = true);
+IMGUI_SFML_NODISCARD IMGUI_SFML_API bool Init(sf::Window& window, sf::RenderTarget& target,
+                                              bool loadDefaultFont = true);
+IMGUI_SFML_NODISCARD IMGUI_SFML_API bool Init(sf::Window& window, const sf::Vector2f& displaySize,
+                                              bool loadDefaultFont = true);
+
+IMGUI_SFML_API void SetCurrentWindow(const sf::Window& window);
+IMGUI_SFML_API void ProcessEvent(const sf::Event& event); // DEPRECATED: use (window,
+                                                          // event) overload
+IMGUI_SFML_API void ProcessEvent(const sf::Window& window, const sf::Event& event);
+
+IMGUI_SFML_API void Update(sf::RenderWindow& window, sf::Time dt);
+IMGUI_SFML_API void Update(sf::Window& window, sf::RenderTarget& target, sf::Time dt);
+IMGUI_SFML_API void Update(const sf::Vector2i& mousePos, const sf::Vector2f& displaySize,
+                           sf::Time dt);
+
+IMGUI_SFML_API void Render(sf::RenderWindow& target);
+IMGUI_SFML_API void Render(sf::RenderTarget& target);
+IMGUI_SFML_API void Render();
+
+IMGUI_SFML_API void Shutdown(const sf::Window& window);
+// Shuts down all ImGui contexts
+IMGUI_SFML_API void Shutdown();
+
+IMGUI_SFML_NODISCARD IMGUI_SFML_API bool UpdateFontTexture();
+IMGUI_SFML_API sf::Texture& GetFontTexture();
+
+// joystick functions
+IMGUI_SFML_API void SetActiveJoystickId(unsigned int joystickId);
+IMGUI_SFML_API void SetJoystickDPadThreshold(float threshold);
+IMGUI_SFML_API void SetJoystickLStickThreshold(float threshold);
+IMGUI_SFML_API void SetJoystickRStickThreshold(float threshold);
+IMGUI_SFML_API void SetJoystickLTriggerThreshold(float threshold);
+IMGUI_SFML_API void SetJoystickRTriggerThreshold(float threshold);
+
+IMGUI_SFML_API void SetJoystickMapping(int key, unsigned int joystickButton);
+IMGUI_SFML_API void SetDPadXAxis(sf::Joystick::Axis dPadXAxis, bool inverted = false);
+IMGUI_SFML_API void SetDPadYAxis(sf::Joystick::Axis dPadYAxis, bool inverted = false);
+IMGUI_SFML_API void SetLStickXAxis(sf::Joystick::Axis lStickXAxis, bool inverted = false);
+IMGUI_SFML_API void SetLStickYAxis(sf::Joystick::Axis lStickYAxis, bool inverted = false);
+IMGUI_SFML_API void SetRStickXAxis(sf::Joystick::Axis rStickXAxis, bool inverted = false);
+IMGUI_SFML_API void SetRStickYAxis(sf::Joystick::Axis rStickYAxis, bool inverted = false);
+IMGUI_SFML_API void SetLTriggerAxis(sf::Joystick::Axis lTriggerAxis);
+IMGUI_SFML_API void SetRTriggerAxis(sf::Joystick::Axis rTriggerAxis);
+} // end of namespace SFML
+
+// custom SFML overloads for ImGui widgets
+
+// Image overloads for sf::Texture
+IMGUI_SFML_API void Image(const sf::Texture& texture, const sf::Color& tintColor = sf::Color::White,
+                          const sf::Color& borderColor = sf::Color::Transparent);
+IMGUI_SFML_API void Image(const sf::Texture& texture, const sf::Vector2f& size,
+                          const sf::Color& tintColor = sf::Color::White,
+                          const sf::Color& borderColor = sf::Color::Transparent);
+
+// Image overloads for sf::RenderTexture
+IMGUI_SFML_API void Image(const sf::RenderTexture& texture,
+                          const sf::Color& tintColor = sf::Color::White,
+                          const sf::Color& borderColor = sf::Color::Transparent);
+IMGUI_SFML_API void Image(const sf::RenderTexture& texture, const sf::Vector2f& size,
+                          const sf::Color& tintColor = sf::Color::White,
+                          const sf::Color& borderColor = sf::Color::Transparent);
+
+// Image overloads for sf::Sprite
+IMGUI_SFML_API void Image(const sf::Sprite& sprite, const sf::Color& tintColor = sf::Color::White,
+                          const sf::Color& borderColor = sf::Color::Transparent);
+IMGUI_SFML_API void Image(const sf::Sprite& sprite, const sf::Vector2f& size,
+                          const sf::Color& tintColor = sf::Color::White,
+                          const sf::Color& borderColor = sf::Color::Transparent);
+
+// ImageButton overloads for sf::Texture
+IMGUI_SFML_API bool ImageButton(const sf::Texture& texture, const int framePadding = -1,
+                                const sf::Color& bgColor = sf::Color::Transparent,
+                                const sf::Color& tintColor = sf::Color::White);
+IMGUI_SFML_API bool ImageButton(const sf::Texture& texture, const sf::Vector2f& size,
+                                const int framePadding = -1,
+                                const sf::Color& bgColor = sf::Color::Transparent,
+                                const sf::Color& tintColor = sf::Color::White);
+
+// ImageButton overloads for sf::RenderTexture
+IMGUI_SFML_API bool ImageButton(const sf::RenderTexture& texture, const int framePadding = -1,
+                                const sf::Color& bgColor = sf::Color::Transparent,
+                                const sf::Color& tintColor = sf::Color::White);
+IMGUI_SFML_API bool ImageButton(const sf::RenderTexture& texture, const sf::Vector2f& size,
+                                const int framePadding = -1,
+                                const sf::Color& bgColor = sf::Color::Transparent,
+                                const sf::Color& tintColor = sf::Color::White);
+
+// ImageButton overloads for sf::Sprite
+IMGUI_SFML_API bool ImageButton(const sf::Sprite& sprite, const int framePadding = -1,
+                                const sf::Color& bgColor = sf::Color::Transparent,
+                                const sf::Color& tintColor = sf::Color::White);
+IMGUI_SFML_API bool ImageButton(const sf::Sprite& sprite, const sf::Vector2f& size,
+                                const int framePadding = -1,
+                                const sf::Color& bgColor = sf::Color::Transparent,
+                                const sf::Color& tintColor = sf::Color::White);
+
+// Draw_list overloads. All positions are in relative coordinates (relative to top-left of the
+// current window)
+IMGUI_SFML_API void DrawLine(const sf::Vector2f& a, const sf::Vector2f& b, const sf::Color& col,
+                             float thickness = 1.0f);
+IMGUI_SFML_API void DrawRect(const sf::FloatRect& rect, const sf::Color& color,
+                             float rounding = 0.0f, int rounding_corners = 0x0F,
+                             float thickness = 1.0f);
+IMGUI_SFML_API void DrawRectFilled(const sf::FloatRect& rect, const sf::Color& color,
+                                   float rounding = 0.0f, int rounding_corners = 0x0F);
+} // end of namespace ImGui
+
+#endif //# IMGUI_SFML_H

gui/imgui-sfml/imgui-SFML_export.h

@@ -0,0 +1,25 @@
+#ifndef IMGUI_SFML_EXPORT_H
+#define IMGUI_SFML_EXPORT_H
+
+#if IMGUI_SFML_SHARED_LIB
+#if _WIN32
+#ifdef IMGUI_SFML_EXPORTS
+#define IMGUI_SFML_API __declspec(dllexport)
+#define IMGUI_API __declspec(dllexport)
+#else
+#define IMGUI_SFML_API __declspec(dllimport)
+#define IMGUI_API __declspec(dllexport)
+#endif
+#elif __GNUC__ >= 4
+#define IMGUI_SFML_API __attribute__((visibility("default")))
+#define IMGUI_API __attribute__((visibility("default")))
+#else
+#define IMGUI_SFML_API
+#define IMGUI_API
+#endif
+#else
+#define IMGUI_SFML_API
+#define IMGUI_API
+#endif
+
+#endif

gui/imgui/imconfig.h

@@ -0,0 +1,129 @@
+//-----------------------------------------------------------------------------
+// DEAR IMGUI COMPILE-TIME OPTIONS
+// Runtime options (clipboard callbacks, enabling various features, etc.) can generally be set via the ImGuiIO structure.
+// You can use ImGui::SetAllocatorFunctions() before calling ImGui::CreateContext() to rewire memory allocation functions.
+//-----------------------------------------------------------------------------
+// A) You may edit imconfig.h (and not overwrite it when updating Dear ImGui, or maintain a patch/rebased branch with your modifications to it)
+// B) or '#define IMGUI_USER_CONFIG "my_imgui_config.h"' in your project and then add directives in your own file without touching this template.
+//-----------------------------------------------------------------------------
+// You need to make sure that configuration settings are defined consistently _everywhere_ Dear ImGui is used, which include the imgui*.cpp
+// files but also _any_ of your code that uses Dear ImGui. This is because some compile-time options have an affect on data structures.
+// Defining those options in imconfig.h will ensure every compilation unit gets to see the same data structure layouts.
+// Call IMGUI_CHECKVERSION() from your .cpp file to verify that the data structures your files are using are matching the ones imgui.cpp is using.
+//-----------------------------------------------------------------------------
+
+#pragma once
+
+//---- Define assertion handler. Defaults to calling assert().
+// If your macro uses multiple statements, make sure is enclosed in a 'do { .. } while (0)' block so it can be used as a single statement.
+//#define IM_ASSERT(_EXPR)  MyAssert(_EXPR)
+//#define IM_ASSERT(_EXPR)  ((void)(_EXPR))     // Disable asserts
+
+//---- Define attributes of all API symbols declarations, e.g. for DLL under Windows
+// Using Dear ImGui via a shared library is not recommended, because of function call overhead and because we don't guarantee backward nor forward ABI compatibility.
+// DLL users: heaps and globals are not shared across DLL boundaries! You will need to call SetCurrentContext() + SetAllocatorFunctions()
+// for each static/DLL boundary you are calling from. Read "Context and Memory Allocators" section of imgui.cpp for more details.
+//#define IMGUI_API __declspec( dllexport )
+//#define IMGUI_API __declspec( dllimport )
+
+//---- Don't define obsolete functions/enums/behaviors. Consider enabling from time to time after updating to clean your code of obsolete function/names.
+//#define IMGUI_DISABLE_OBSOLETE_FUNCTIONS
+//#define IMGUI_DISABLE_OBSOLETE_KEYIO                      // 1.87+ disable legacy io.KeyMap[]+io.KeysDown[] in favor io.AddKeyEvent(). This is automatically done by IMGUI_DISABLE_OBSOLETE_FUNCTIONS.
+
+//---- Disable all of Dear ImGui or don't implement standard windows/tools.
+// It is very strongly recommended to NOT disable the demo windows and debug tool during development. They are extremely useful in day to day work. Please read comments in imgui_demo.cpp.
+//#define IMGUI_DISABLE                                     // Disable everything: all headers and source files will be empty.
+//#define IMGUI_DISABLE_DEMO_WINDOWS                        // Disable demo windows: ShowDemoWindow()/ShowStyleEditor() will be empty.
+//#define IMGUI_DISABLE_DEBUG_TOOLS                         // Disable metrics/debugger and other debug tools: ShowMetricsWindow(), ShowDebugLogWindow() and ShowIDStackToolWindow() will be empty.
+
+//---- Don't implement some functions to reduce linkage requirements.
+//#define IMGUI_DISABLE_WIN32_DEFAULT_CLIPBOARD_FUNCTIONS   // [Win32] Don't implement default clipboard handler. Won't use and link with OpenClipboard/GetClipboardData/CloseClipboard etc. (user32.lib/.a, kernel32.lib/.a)
+//#define IMGUI_ENABLE_WIN32_DEFAULT_IME_FUNCTIONS          // [Win32] [Default with Visual Studio] Implement default IME handler (require imm32.lib/.a, auto-link for Visual Studio, -limm32 on command-line for MinGW)
+//#define IMGUI_DISABLE_WIN32_DEFAULT_IME_FUNCTIONS         // [Win32] [Default with non-Visual Studio compilers] Don't implement default IME handler (won't require imm32.lib/.a)
+//#define IMGUI_DISABLE_WIN32_FUNCTIONS                     // [Win32] Won't use and link with any Win32 function (clipboard, IME).
+//#define IMGUI_ENABLE_OSX_DEFAULT_CLIPBOARD_FUNCTIONS      // [OSX] Implement default OSX clipboard handler (need to link with '-framework ApplicationServices', this is why this is not the default).
+//#define IMGUI_DISABLE_DEFAULT_FORMAT_FUNCTIONS            // Don't implement ImFormatString/ImFormatStringV so you can implement them yourself (e.g. if you don't want to link with vsnprintf)
+//#define IMGUI_DISABLE_DEFAULT_MATH_FUNCTIONS              // Don't implement ImFabs/ImSqrt/ImPow/ImFmod/ImCos/ImSin/ImAcos/ImAtan2 so you can implement them yourself.
+//#define IMGUI_DISABLE_FILE_FUNCTIONS                      // Don't implement ImFileOpen/ImFileClose/ImFileRead/ImFileWrite and ImFileHandle at all (replace them with dummies)
+//#define IMGUI_DISABLE_DEFAULT_FILE_FUNCTIONS              // Don't implement ImFileOpen/ImFileClose/ImFileRead/ImFileWrite and ImFileHandle so you can implement them yourself if you don't want to link with fopen/fclose/fread/fwrite. This will also disable the LogToTTY() function.
+//#define IMGUI_DISABLE_DEFAULT_ALLOCATORS                  // Don't implement default allocators calling malloc()/free() to avoid linking with them. You will need to call ImGui::SetAllocatorFunctions().
+//#define IMGUI_DISABLE_SSE                                 // Disable use of SSE intrinsics even if available
+
+//---- Include imgui_user.h at the end of imgui.h as a convenience
+//#define IMGUI_INCLUDE_IMGUI_USER_H
+
+//---- Pack colors to BGRA8 instead of RGBA8 (to avoid converting from one to another)
+//#define IMGUI_USE_BGRA_PACKED_COLOR
+
+//---- Use 32-bit for ImWchar (default is 16-bit) to support unicode planes 1-16. (e.g. point beyond 0xFFFF like emoticons, dingbats, symbols, shapes, ancient languages, etc...)
+//#define IMGUI_USE_WCHAR32
+
+//---- Avoid multiple STB libraries implementations, or redefine path/filenames to prioritize another version
+// By default the embedded implementations are declared static and not available outside of Dear ImGui sources files.
+//#define IMGUI_STB_TRUETYPE_FILENAME   "my_folder/stb_truetype.h"
+//#define IMGUI_STB_RECT_PACK_FILENAME  "my_folder/stb_rect_pack.h"
+//#define IMGUI_STB_SPRINTF_FILENAME    "my_folder/stb_sprintf.h"    // only used if IMGUI_USE_STB_SPRINTF is defined.
+//#define IMGUI_DISABLE_STB_TRUETYPE_IMPLEMENTATION
+//#define IMGUI_DISABLE_STB_RECT_PACK_IMPLEMENTATION
+//#define IMGUI_DISABLE_STB_SPRINTF_IMPLEMENTATION                   // only disabled if IMGUI_USE_STB_SPRINTF is defined.
+
+//---- Use stb_sprintf.h for a faster implementation of vsnprintf instead of the one from libc (unless IMGUI_DISABLE_DEFAULT_FORMAT_FUNCTIONS is defined)
+// Compatibility checks of arguments and formats done by clang and GCC will be disabled in order to support the extra formats provided by stb_sprintf.h.
+//#define IMGUI_USE_STB_SPRINTF
+
+//---- Use FreeType to build and rasterize the font atlas (instead of stb_truetype which is embedded by default in Dear ImGui)
+// Requires FreeType headers to be available in the include path. Requires program to be compiled with 'misc/freetype/imgui_freetype.cpp' (in this repository) + the FreeType library (not provided).
+// On Windows you may use vcpkg with 'vcpkg install freetype --triplet=x64-windows' + 'vcpkg integrate install'.
+//#define IMGUI_ENABLE_FREETYPE
+
+//---- Use FreeType+lunasvg library to render OpenType SVG fonts (SVGinOT)
+// Requires lunasvg headers to be available in the include path + program to be linked with the lunasvg library (not provided).
+// Only works in combination with IMGUI_ENABLE_FREETYPE.
+// (implementation is based on Freetype's rsvg-port.c which is licensed under CeCILL-C Free Software License Agreement)
+//#define IMGUI_ENABLE_FREETYPE_LUNASVG
+
+//---- Use stb_truetype to build and rasterize the font atlas (default)
+// The only purpose of this define is if you want force compilation of the stb_truetype backend ALONG with the FreeType backend.
+//#define IMGUI_ENABLE_STB_TRUETYPE
+
+//---- Define constructor and implicit cast operators to convert back<>forth between your math types and ImVec2/ImVec4.
+// This will be inlined as part of ImVec2 and ImVec4 class declarations.
+/*
+#define IM_VEC2_CLASS_EXTRA                                                     \
+        constexpr ImVec2(const MyVec2& f) : x(f.x), y(f.y) {}                   \
+        operator MyVec2() const { return MyVec2(x,y); }
+
+#define IM_VEC4_CLASS_EXTRA                                                     \
+        constexpr ImVec4(const MyVec4& f) : x(f.x), y(f.y), z(f.z), w(f.w) {}   \
+        operator MyVec4() const { return MyVec4(x,y,z,w); }
+*/
+//---- ...Or use Dear ImGui's own very basic math operators.
+//#define IMGUI_DEFINE_MATH_OPERATORS
+
+//---- Use 32-bit vertex indices (default is 16-bit) is one way to allow large meshes with more than 64K vertices.
+// Your renderer backend will need to support it (most example renderer backends support both 16/32-bit indices).
+// Another way to allow large meshes while keeping 16-bit indices is to handle ImDrawCmd::VtxOffset in your renderer.
+// Read about ImGuiBackendFlags_RendererHasVtxOffset for details.
+//#define ImDrawIdx unsigned int
+
+//---- Override ImDrawCallback signature (will need to modify renderer backends accordingly)
+//struct ImDrawList;
+//struct ImDrawCmd;
+//typedef void (*MyImDrawCallback)(const ImDrawList* draw_list, const ImDrawCmd* cmd, void* my_renderer_user_data);
+//#define ImDrawCallback MyImDrawCallback
+
+//---- Debug Tools: Macro to break in Debugger (we provide a default implementation of this in the codebase)
+// (use 'Metrics->Tools->Item Picker' to pick widgets with the mouse and break into them for easy debugging.)
+//#define IM_DEBUG_BREAK  IM_ASSERT(0)
+//#define IM_DEBUG_BREAK  __debugbreak()
+
+//---- Debug Tools: Enable slower asserts
+//#define IMGUI_DEBUG_PARANOID
+
+//---- Tip: You can add extra functions within the ImGui:: namespace from anywhere (e.g. your own sources/header files)
+/*
+namespace ImGui
+{
+    void MyFunction(const char* name, MyMatrix44* mtx);
+}
+*/

gui/imgui/imgui_stdlib.cpp

@@ -0,0 +1,85 @@
+// dear imgui: wrappers for C++ standard library (STL) types (std::string, etc.)
+// This is also an example of how you may wrap your own similar types.
+
+// Changelog:
+// - v0.10: Initial version. Added InputText() / InputTextMultiline() calls with std::string
+
+// See more C++ related extension (fmt, RAII, syntaxis sugar) on Wiki:
+//   https://github.com/ocornut/imgui/wiki/Useful-Extensions#cness
+
+#include "imgui.h"
+#include "imgui_stdlib.h"
+
+// Clang warnings with -Weverything
+#if defined(__clang__)
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wsign-conversion"    // warning: implicit conversion changes signedness
+#endif
+
+struct InputTextCallback_UserData
+{
+    std::string*            Str;
+    ImGuiInputTextCallback  ChainCallback;
+    void*                   ChainCallbackUserData;
+};
+
+static int InputTextCallback(ImGuiInputTextCallbackData* data)
+{
+    InputTextCallback_UserData* user_data = (InputTextCallback_UserData*)data->UserData;
+    if (data->EventFlag == ImGuiInputTextFlags_CallbackResize)
+    {
+        // Resize string callback
+        // If for some reason we refuse the new length (BufTextLen) and/or capacity (BufSize) we need to set them back to what we want.
+        std::string* str = user_data->Str;
+        IM_ASSERT(data->Buf == str->c_str());
+        str->resize(data->BufTextLen);
+        data->Buf = (char*)str->c_str();
+    }
+    else if (user_data->ChainCallback)
+    {
+        // Forward to user callback, if any
+        data->UserData = user_data->ChainCallbackUserData;
+        return user_data->ChainCallback(data);
+    }
+    return 0;
+}
+
+bool ImGui::InputText(const char* label, std::string* str, ImGuiInputTextFlags flags, ImGuiInputTextCallback callback, void* user_data)
+{
+    IM_ASSERT((flags & ImGuiInputTextFlags_CallbackResize) == 0);
+    flags |= ImGuiInputTextFlags_CallbackResize;
+
+    InputTextCallback_UserData cb_user_data;
+    cb_user_data.Str = str;
+    cb_user_data.ChainCallback = callback;
+    cb_user_data.ChainCallbackUserData = user_data;
+    return InputText(label, (char*)str->c_str(), str->capacity() + 1, flags, InputTextCallback, &cb_user_data);
+}
+
+bool ImGui::InputTextMultiline(const char* label, std::string* str, const ImVec2& size, ImGuiInputTextFlags flags, ImGuiInputTextCallback callback, void* user_data)
+{
+    IM_ASSERT((flags & ImGuiInputTextFlags_CallbackResize) == 0);
+    flags |= ImGuiInputTextFlags_CallbackResize;
+
+    InputTextCallback_UserData cb_user_data;
+    cb_user_data.Str = str;
+    cb_user_data.ChainCallback = callback;
+    cb_user_data.ChainCallbackUserData = user_data;
+    return InputTextMultiline(label, (char*)str->c_str(), str->capacity() + 1, size, flags, InputTextCallback, &cb_user_data);
+}
+
+bool ImGui::InputTextWithHint(const char* label, const char* hint, std::string* str, ImGuiInputTextFlags flags, ImGuiInputTextCallback callback, void* user_data)
+{
+    IM_ASSERT((flags & ImGuiInputTextFlags_CallbackResize) == 0);
+    flags |= ImGuiInputTextFlags_CallbackResize;
+
+    InputTextCallback_UserData cb_user_data;
+    cb_user_data.Str = str;
+    cb_user_data.ChainCallback = callback;
+    cb_user_data.ChainCallbackUserData = user_data;
+    return InputTextWithHint(label, hint, (char*)str->c_str(), str->capacity() + 1, flags, InputTextCallback, &cb_user_data);
+}
+
+#if defined(__clang__)
+#pragma clang diagnostic pop
+#endif

gui/imgui/imgui_stdlib.h

@@ -0,0 +1,21 @@
+// dear imgui: wrappers for C++ standard library (STL) types (std::string, etc.)
+// This is also an example of how you may wrap your own similar types.
+
+// Changelog:
+// - v0.10: Initial version. Added InputText() / InputTextMultiline() calls with std::string
+
+// See more C++ related extension (fmt, RAII, syntaxis sugar) on Wiki:
+//   https://github.com/ocornut/imgui/wiki/Useful-Extensions#cness
+
+#pragma once
+
+#include <string>
+
+namespace ImGui
+{
+    // ImGui::InputText() with std::string
+    // Because text input needs dynamic resizing, we need to setup a callback to grow the capacity
+    IMGUI_API bool  InputText(const char* label, std::string* str, ImGuiInputTextFlags flags = 0, ImGuiInputTextCallback callback = nullptr, void* user_data = nullptr);
+    IMGUI_API bool  InputTextMultiline(const char* label, std::string* str, const ImVec2& size = ImVec2(0, 0), ImGuiInputTextFlags flags = 0, ImGuiInputTextCallback callback = nullptr, void* user_data = nullptr);
+    IMGUI_API bool  InputTextWithHint(const char* label, const char* hint, std::string* str, ImGuiInputTextFlags flags = 0, ImGuiInputTextCallback callback = nullptr, void* user_data = nullptr);
+}

gui/imgui/imstb_rectpack.h

@@ -0,0 +1,627 @@
+// [DEAR IMGUI]
+// This is a slightly modified version of stb_rect_pack.h 1.01.
+// Grep for [DEAR IMGUI] to find the changes.
+// 
+// stb_rect_pack.h - v1.01 - public domain - rectangle packing
+// Sean Barrett 2014
+//
+// Useful for e.g. packing rectangular textures into an atlas.
+// Does not do rotation.
+//
+// Before #including,
+//
+//    #define STB_RECT_PACK_IMPLEMENTATION
+//
+// in the file that you want to have the implementation.
+//
+// Not necessarily the awesomest packing method, but better than
+// the totally naive one in stb_truetype (which is primarily what
+// this is meant to replace).
+//
+// Has only had a few tests run, may have issues.
+//
+// More docs to come.
+//
+// No memory allocations; uses qsort() and assert() from stdlib.
+// Can override those by defining STBRP_SORT and STBRP_ASSERT.
+//
+// This library currently uses the Skyline Bottom-Left algorithm.
+//
+// Please note: better rectangle packers are welcome! Please
+// implement them to the same API, but with a different init
+// function.
+//
+// Credits
+//
+//  Library
+//    Sean Barrett
+//  Minor features
+//    Martins Mozeiko
+//    github:IntellectualKitty
+//
+//  Bugfixes / warning fixes
+//    Jeremy Jaussaud
+//    Fabian Giesen
+//
+// Version history:
+//
+//     1.01  (2021-07-11)  always use large rect mode, expose STBRP__MAXVAL in public section
+//     1.00  (2019-02-25)  avoid small space waste; gracefully fail too-wide rectangles
+//     0.99  (2019-02-07)  warning fixes
+//     0.11  (2017-03-03)  return packing success/fail result
+//     0.10  (2016-10-25)  remove cast-away-const to avoid warnings
+//     0.09  (2016-08-27)  fix compiler warnings
+//     0.08  (2015-09-13)  really fix bug with empty rects (w=0 or h=0)
+//     0.07  (2015-09-13)  fix bug with empty rects (w=0 or h=0)
+//     0.06  (2015-04-15)  added STBRP_SORT to allow replacing qsort
+//     0.05:  added STBRP_ASSERT to allow replacing assert
+//     0.04:  fixed minor bug in STBRP_LARGE_RECTS support
+//     0.01:  initial release
+//
+// LICENSE
+//
+//   See end of file for license information.
+
+//////////////////////////////////////////////////////////////////////////////
+//
+//       INCLUDE SECTION
+//
+
+#ifndef STB_INCLUDE_STB_RECT_PACK_H
+#define STB_INCLUDE_STB_RECT_PACK_H
+
+#define STB_RECT_PACK_VERSION  1
+
+#ifdef STBRP_STATIC
+#define STBRP_DEF static
+#else
+#define STBRP_DEF extern
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+typedef struct stbrp_context stbrp_context;
+typedef struct stbrp_node    stbrp_node;
+typedef struct stbrp_rect    stbrp_rect;
+
+typedef int            stbrp_coord;
+
+#define STBRP__MAXVAL  0x7fffffff
+// Mostly for internal use, but this is the maximum supported coordinate value.
+
+STBRP_DEF int stbrp_pack_rects (stbrp_context *context, stbrp_rect *rects, int num_rects);
+// Assign packed locations to rectangles. The rectangles are of type
+// 'stbrp_rect' defined below, stored in the array 'rects', and there
+// are 'num_rects' many of them.
+//
+// Rectangles which are successfully packed have the 'was_packed' flag
+// set to a non-zero value and 'x' and 'y' store the minimum location
+// on each axis (i.e. bottom-left in cartesian coordinates, top-left
+// if you imagine y increasing downwards). Rectangles which do not fit
+// have the 'was_packed' flag set to 0.
+//
+// You should not try to access the 'rects' array from another thread
+// while this function is running, as the function temporarily reorders
+// the array while it executes.
+//
+// To pack into another rectangle, you need to call stbrp_init_target
+// again. To continue packing into the same rectangle, you can call
+// this function again. Calling this multiple times with multiple rect
+// arrays will probably produce worse packing results than calling it
+// a single time with the full rectangle array, but the option is
+// available.
+//
+// The function returns 1 if all of the rectangles were successfully
+// packed and 0 otherwise.
+
+struct stbrp_rect
+{
+   // reserved for your use:
+   int            id;
+
+   // input:
+   stbrp_coord    w, h;
+
+   // output:
+   stbrp_coord    x, y;
+   int            was_packed;  // non-zero if valid packing
+
+}; // 16 bytes, nominally
+
+
+STBRP_DEF void stbrp_init_target (stbrp_context *context, int width, int height, stbrp_node *nodes, int num_nodes);
+// Initialize a rectangle packer to:
+//    pack a rectangle that is 'width' by 'height' in dimensions
+//    using temporary storage provided by the array 'nodes', which is 'num_nodes' long
+//
+// You must call this function every time you start packing into a new target.
+//
+// There is no "shutdown" function. The 'nodes' memory must stay valid for
+// the following stbrp_pack_rects() call (or calls), but can be freed after
+// the call (or calls) finish.
+//
+// Note: to guarantee best results, either:
+//       1. make sure 'num_nodes' >= 'width'
+//   or  2. call stbrp_allow_out_of_mem() defined below with 'allow_out_of_mem = 1'
+//
+// If you don't do either of the above things, widths will be quantized to multiples
+// of small integers to guarantee the algorithm doesn't run out of temporary storage.
+//
+// If you do #2, then the non-quantized algorithm will be used, but the algorithm
+// may run out of temporary storage and be unable to pack some rectangles.
+
+STBRP_DEF void stbrp_setup_allow_out_of_mem (stbrp_context *context, int allow_out_of_mem);
+// Optionally call this function after init but before doing any packing to
+// change the handling of the out-of-temp-memory scenario, described above.
+// If you call init again, this will be reset to the default (false).
+
+
+STBRP_DEF void stbrp_setup_heuristic (stbrp_context *context, int heuristic);
+// Optionally select which packing heuristic the library should use. Different
+// heuristics will produce better/worse results for different data sets.
+// If you call init again, this will be reset to the default.
+
+enum
+{
+   STBRP_HEURISTIC_Skyline_default=0,
+   STBRP_HEURISTIC_Skyline_BL_sortHeight = STBRP_HEURISTIC_Skyline_default,
+   STBRP_HEURISTIC_Skyline_BF_sortHeight
+};
+
+
+//////////////////////////////////////////////////////////////////////////////
+//
+// the details of the following structures don't matter to you, but they must
+// be visible so you can handle the memory allocations for them
+
+struct stbrp_node
+{
+   stbrp_coord  x,y;
+   stbrp_node  *next;
+};
+
+struct stbrp_context
+{
+   int width;
+   int height;
+   int align;
+   int init_mode;
+   int heuristic;
+   int num_nodes;
+   stbrp_node *active_head;
+   stbrp_node *free_head;
+   stbrp_node extra[2]; // we allocate two extra nodes so optimal user-node-count is 'width' not 'width+2'
+};
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
+
+//////////////////////////////////////////////////////////////////////////////
+//
+//     IMPLEMENTATION SECTION
+//
+
+#ifdef STB_RECT_PACK_IMPLEMENTATION
+#ifndef STBRP_SORT
+#include <stdlib.h>
+#define STBRP_SORT qsort
+#endif
+
+#ifndef STBRP_ASSERT
+#include <assert.h>
+#define STBRP_ASSERT assert
+#endif
+
+#ifdef _MSC_VER
+#define STBRP__NOTUSED(v)  (void)(v)
+#define STBRP__CDECL       __cdecl
+#else
+#define STBRP__NOTUSED(v)  (void)sizeof(v)
+#define STBRP__CDECL
+#endif
+
+enum
+{
+   STBRP__INIT_skyline = 1
+};
+
+STBRP_DEF void stbrp_setup_heuristic(stbrp_context *context, int heuristic)
+{
+   switch (context->init_mode) {
+      case STBRP__INIT_skyline:
+         STBRP_ASSERT(heuristic == STBRP_HEURISTIC_Skyline_BL_sortHeight || heuristic == STBRP_HEURISTIC_Skyline_BF_sortHeight);
+         context->heuristic = heuristic;
+         break;
+      default:
+         STBRP_ASSERT(0);
+   }
+}
+
+STBRP_DEF void stbrp_setup_allow_out_of_mem(stbrp_context *context, int allow_out_of_mem)
+{
+   if (allow_out_of_mem)
+      // if it's ok to run out of memory, then don't bother aligning them;
+      // this gives better packing, but may fail due to OOM (even though
+      // the rectangles easily fit). @TODO a smarter approach would be to only
+      // quantize once we've hit OOM, then we could get rid of this parameter.
+      context->align = 1;
+   else {
+      // if it's not ok to run out of memory, then quantize the widths
+      // so that num_nodes is always enough nodes.
+      //
+      // I.e. num_nodes * align >= width
+      //                  align >= width / num_nodes
+      //                  align = ceil(width/num_nodes)
+
+      context->align = (context->width + context->num_nodes-1) / context->num_nodes;
+   }
+}
+
+STBRP_DEF void stbrp_init_target(stbrp_context *context, int width, int height, stbrp_node *nodes, int num_nodes)
+{
+   int i;
+
+   for (i=0; i < num_nodes-1; ++i)
+      nodes[i].next = &nodes[i+1];
+   nodes[i].next = NULL;
+   context->init_mode = STBRP__INIT_skyline;
+   context->heuristic = STBRP_HEURISTIC_Skyline_default;
+   context->free_head = &nodes[0];
+   context->active_head = &context->extra[0];
+   context->width = width;
+   context->height = height;
+   context->num_nodes = num_nodes;
+   stbrp_setup_allow_out_of_mem(context, 0);
+
+   // node 0 is the full width, node 1 is the sentinel (lets us not store width explicitly)
+   context->extra[0].x = 0;
+   context->extra[0].y = 0;
+   context->extra[0].next = &context->extra[1];
+   context->extra[1].x = (stbrp_coord) width;
+   context->extra[1].y = (1<<30);
+   context->extra[1].next = NULL;
+}
+
+// find minimum y position if it starts at x1
+static int stbrp__skyline_find_min_y(stbrp_context *c, stbrp_node *first, int x0, int width, int *pwaste)
+{
+   stbrp_node *node = first;
+   int x1 = x0 + width;
+   int min_y, visited_width, waste_area;
+
+   STBRP__NOTUSED(c);
+
+   STBRP_ASSERT(first->x <= x0);
+
+   #if 0
+   // skip in case we're past the node
+   while (node->next->x <= x0)
+      ++node;
+   #else
+   STBRP_ASSERT(node->next->x > x0); // we ended up handling this in the caller for efficiency
+   #endif
+
+   STBRP_ASSERT(node->x <= x0);
+
+   min_y = 0;
+   waste_area = 0;
+   visited_width = 0;
+   while (node->x < x1) {
+      if (node->y > min_y) {
+         // raise min_y higher.
+         // we've accounted for all waste up to min_y,
+         // but we'll now add more waste for everything we've visted
+         waste_area += visited_width * (node->y - min_y);
+         min_y = node->y;
+         // the first time through, visited_width might be reduced
+         if (node->x < x0)
+            visited_width += node->next->x - x0;
+         else
+            visited_width += node->next->x - node->x;
+      } else {
+         // add waste area
+         int under_width = node->next->x - node->x;
+         if (under_width + visited_width > width)
+            under_width = width - visited_width;
+         waste_area += under_width * (min_y - node->y);
+         visited_width += under_width;
+      }
+      node = node->next;
+   }
+
+   *pwaste = waste_area;
+   return min_y;
+}
+
+typedef struct
+{
+   int x,y;
+   stbrp_node **prev_link;
+} stbrp__findresult;
+
+static stbrp__findresult stbrp__skyline_find_best_pos(stbrp_context *c, int width, int height)
+{
+   int best_waste = (1<<30), best_x, best_y = (1 << 30);
+   stbrp__findresult fr;
+   stbrp_node **prev, *node, *tail, **best = NULL;
+
+   // align to multiple of c->align
+   width = (width + c->align - 1);
+   width -= width % c->align;
+   STBRP_ASSERT(width % c->align == 0);
+
+   // if it can't possibly fit, bail immediately
+   if (width > c->width || height > c->height) {
+      fr.prev_link = NULL;
+      fr.x = fr.y = 0;
+      return fr;
+   }
+
+   node = c->active_head;
+   prev = &c->active_head;
+   while (node->x + width <= c->width) {
+      int y,waste;
+      y = stbrp__skyline_find_min_y(c, node, node->x, width, &waste);
+      if (c->heuristic == STBRP_HEURISTIC_Skyline_BL_sortHeight) { // actually just want to test BL
+         // bottom left
+         if (y < best_y) {
+            best_y = y;
+            best = prev;
+         }
+      } else {
+         // best-fit
+         if (y + height <= c->height) {
+            // can only use it if it first vertically
+            if (y < best_y || (y == best_y && waste < best_waste)) {
+               best_y = y;
+               best_waste = waste;
+               best = prev;
+            }
+         }
+      }
+      prev = &node->next;
+      node = node->next;
+   }
+
+   best_x = (best == NULL) ? 0 : (*best)->x;
+
+   // if doing best-fit (BF), we also have to try aligning right edge to each node position
+   //
+   // e.g, if fitting
+   //
+   //     ____________________
+   //    |____________________|
+   //
+   //            into
+   //
+   //   |                         |
+   //   |             ____________|
+   //   |____________|
+   //
+   // then right-aligned reduces waste, but bottom-left BL is always chooses left-aligned
+   //
+   // This makes BF take about 2x the time
+
+   if (c->heuristic == STBRP_HEURISTIC_Skyline_BF_sortHeight) {
+      tail = c->active_head;
+      node = c->active_head;
+      prev = &c->active_head;
+      // find first node that's admissible
+      while (tail->x < width)
+         tail = tail->next;
+      while (tail) {
+         int xpos = tail->x - width;
+         int y,waste;
+         STBRP_ASSERT(xpos >= 0);
+         // find the left position that matches this
+         while (node->next->x <= xpos) {
+            prev = &node->next;
+            node = node->next;
+         }
+         STBRP_ASSERT(node->next->x > xpos && node->x <= xpos);
+         y = stbrp__skyline_find_min_y(c, node, xpos, width, &waste);
+         if (y + height <= c->height) {
+            if (y <= best_y) {
+               if (y < best_y || waste < best_waste || (waste==best_waste && xpos < best_x)) {
+                  best_x = xpos;
+                  //STBRP_ASSERT(y <= best_y); [DEAR IMGUI]
+                  best_y = y;
+                  best_waste = waste;
+                  best = prev;
+               }
+            }
+         }
+         tail = tail->next;
+      }
+   }
+
+   fr.prev_link = best;
+   fr.x = best_x;
+   fr.y = best_y;
+   return fr;
+}
+
+static stbrp__findresult stbrp__skyline_pack_rectangle(stbrp_context *context, int width, int height)
+{
+   // find best position according to heuristic
+   stbrp__findresult res = stbrp__skyline_find_best_pos(context, width, height);
+   stbrp_node *node, *cur;
+
+   // bail if:
+   //    1. it failed
+   //    2. the best node doesn't fit (we don't always check this)
+   //    3. we're out of memory
+   if (res.prev_link == NULL || res.y + height > context->height || context->free_head == NULL) {
+      res.prev_link = NULL;
+      return res;
+   }
+
+   // on success, create new node
+   node = context->free_head;
+   node->x = (stbrp_coord) res.x;
+   node->y = (stbrp_coord) (res.y + height);
+
+   context->free_head = node->next;
+
+   // insert the new node into the right starting point, and
+   // let 'cur' point to the remaining nodes needing to be
+   // stiched back in
+
+   cur = *res.prev_link;
+   if (cur->x < res.x) {
+      // preserve the existing one, so start testing with the next one
+      stbrp_node *next = cur->next;
+      cur->next = node;
+      cur = next;
+   } else {
+      *res.prev_link = node;
+   }
+
+   // from here, traverse cur and free the nodes, until we get to one
+   // that shouldn't be freed
+   while (cur->next && cur->next->x <= res.x + width) {
+      stbrp_node *next = cur->next;
+      // move the current node to the free list
+      cur->next = context->free_head;
+      context->free_head = cur;
+      cur = next;
+   }
+
+   // stitch the list back in
+   node->next = cur;
+
+   if (cur->x < res.x + width)
+      cur->x = (stbrp_coord) (res.x + width);
+
+#ifdef _DEBUG
+   cur = context->active_head;
+   while (cur->x < context->width) {
+      STBRP_ASSERT(cur->x < cur->next->x);
+      cur = cur->next;
+   }
+   STBRP_ASSERT(cur->next == NULL);
+
+   {
+      int count=0;
+      cur = context->active_head;
+      while (cur) {
+         cur = cur->next;
+         ++count;
+      }
+      cur = context->free_head;
+      while (cur) {
+         cur = cur->next;
+         ++count;
+      }
+      STBRP_ASSERT(count == context->num_nodes+2);
+   }
+#endif
+
+   return res;
+}
+
+static int STBRP__CDECL rect_height_compare(const void *a, const void *b)
+{
+   const stbrp_rect *p = (const stbrp_rect *) a;
+   const stbrp_rect *q = (const stbrp_rect *) b;
+   if (p->h > q->h)
+      return -1;
+   if (p->h < q->h)
+      return  1;
+   return (p->w > q->w) ? -1 : (p->w < q->w);
+}
+
+static int STBRP__CDECL rect_original_order(const void *a, const void *b)
+{
+   const stbrp_rect *p = (const stbrp_rect *) a;
+   const stbrp_rect *q = (const stbrp_rect *) b;
+   return (p->was_packed < q->was_packed) ? -1 : (p->was_packed > q->was_packed);
+}
+
+STBRP_DEF int stbrp_pack_rects(stbrp_context *context, stbrp_rect *rects, int num_rects)
+{
+   int i, all_rects_packed = 1;
+
+   // we use the 'was_packed' field internally to allow sorting/unsorting
+   for (i=0; i < num_rects; ++i) {
+      rects[i].was_packed = i;
+   }
+
+   // sort according to heuristic
+   STBRP_SORT(rects, num_rects, sizeof(rects[0]), rect_height_compare);
+
+   for (i=0; i < num_rects; ++i) {
+      if (rects[i].w == 0 || rects[i].h == 0) {
+         rects[i].x = rects[i].y = 0;  // empty rect needs no space
+      } else {
+         stbrp__findresult fr = stbrp__skyline_pack_rectangle(context, rects[i].w, rects[i].h);
+         if (fr.prev_link) {
+            rects[i].x = (stbrp_coord) fr.x;
+            rects[i].y = (stbrp_coord) fr.y;
+         } else {
+            rects[i].x = rects[i].y = STBRP__MAXVAL;
+         }
+      }
+   }
+
+   // unsort
+   STBRP_SORT(rects, num_rects, sizeof(rects[0]), rect_original_order);
+
+   // set was_packed flags and all_rects_packed status
+   for (i=0; i < num_rects; ++i) {
+      rects[i].was_packed = !(rects[i].x == STBRP__MAXVAL && rects[i].y == STBRP__MAXVAL);
+      if (!rects[i].was_packed)
+         all_rects_packed = 0;
+   }
+
+   // return the all_rects_packed status
+   return all_rects_packed;
+}
+#endif
+
+/*
+------------------------------------------------------------------------------
+This software is available under 2 licenses -- choose whichever you prefer.
+------------------------------------------------------------------------------
+ALTERNATIVE A - MIT License
+Copyright (c) 2017 Sean Barrett
+Permission is hereby granted, free of charge, to any person obtaining a copy of
+this software and associated documentation files (the "Software"), to deal in
+the Software without restriction, including without limitation the rights to
+use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
+of the Software, and to permit persons to whom the Software is furnished to do
+so, subject to the following conditions:
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+------------------------------------------------------------------------------
+ALTERNATIVE B - Public Domain (www.unlicense.org)
+This is free and unencumbered software released into the public domain.
+Anyone is free to copy, modify, publish, use, compile, sell, or distribute this
+software, either in source code form or as a compiled binary, for any purpose,
+commercial or non-commercial, and by any means.
+In jurisdictions that recognize copyright laws, the author or authors of this
+software dedicate any and all copyright interest in the software to the public
+domain. We make this dedication for the benefit of the public at large and to
+the detriment of our heirs and successors. We intend this dedication to be an
+overt act of relinquishment in perpetuity of all present and future rights to
+this software under copyright law.
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+------------------------------------------------------------------------------
+*/

main.cpp

@@ -0,0 +1,122 @@
+#include <SFML/System.hpp>
+#include <cmath>
+#include <cstdlib>
+#include <initializer_list>
+#include <iostream>
+#include <cstdio>
+#include <vector>
+
+#include "gui/gui.hpp"
+#include "gui/imgui/imgui.h"
+#include "gui/imgui/imgui_stdlib.h"
+
+#include "types.hpp"
+
+using namespace std;
+
+extern std::map<std::string, render_Bundle> bundles;
+
+render_Bundle    temp_b;
+render_Primitive temp_p;
+
+
+int main(int argc, char *argv[]) {
+	UI ui(sf::Vector2u(1200, 1000), "JackEditor");
+
+	while (ui.Update()) {
+		static bool demo_open = true;
+		ig::ShowDemoWindow(&demo_open);
+
+
+		if (ig::Begin("Draw & Render")) {
+			static ImVec2 scrolling(260.0f, 310.0f);
+			static float  fg[] = {1.0f, 1.0f, 1.0f}, bg[] = {0.0f, 0.0f, 0.0f};
+
+			ig::InputText("Bundle name", &temp_b.name);
+
+			ig::ColorEdit3("Foreground", fg, ImGuiColorEditFlags_PickerHueWheel);
+			ig::ColorEdit3("Background", bg, ImGuiColorEditFlags_PickerHueWheel);
+
+			ig::RadioButton("Lines", (int *)&temp_p.type, render_Lines);
+			ig::SameLine();
+			ig::RadioButton("LineStrip", (int *)&temp_p.type, render_LineStrip);
+			ig::SameLine();
+			ig::RadioButton("Polygon", (int *)&temp_p.type, render_Polygon);
+
+			// Using InvisibleButton() as a convenience 1) it will advance the layout cursor and 2) allows us to use IsItemHovered()/IsItemActive()
+			ImVec2 canvas_p0 = ImGui::GetCursorScreenPos();    // ImDrawList API uses screen coordinates!
+			ImVec2 canvas_sz = ImGui::GetContentRegionAvail(); // Resize canvas to what's available
+			if (canvas_sz.x < 50.0f)
+				canvas_sz.x = 50.0f;
+			if (canvas_sz.y < 50.0f)
+				canvas_sz.y = 50.0f;
+			ImVec2 canvas_p1 = ImVec2(canvas_p0.x + canvas_sz.x, canvas_p0.y + canvas_sz.y);
+
+			// Draw border and background color
+			ImGuiIO    &io        = ImGui::GetIO();
+			ImDrawList *draw_list = ImGui::GetWindowDrawList();
+			draw_list->AddRectFilled(canvas_p0, canvas_p1, IM_COL32(50, 50, 50, 255));
+			draw_list->AddRect(canvas_p0, canvas_p1, IM_COL32(255, 255, 255, 255));
+
+			// This will catch our interactions
+			ImGui::InvisibleButton("canvas", canvas_sz, ImGuiButtonFlags_MouseButtonLeft | ImGuiButtonFlags_MouseButtonRight);
+			const bool   is_hovered = ImGui::IsItemHovered();                          // Hovered
+			const bool   is_active  = ImGui::IsItemActive();                           // Held
+			const ImVec2 origin(canvas_p0.x + scrolling.x, canvas_p0.y + scrolling.y); // Lock scrolled origin
+			const ImVec2 mouse_pos_in_canvas(io.MousePos.x - origin.x, io.MousePos.y - origin.y);
+
+			if (is_active && ImGui::IsMouseDragging(ImGuiMouseButton_Right, 0.0f)) {
+				scrolling.x += io.MouseDelta.x;
+				scrolling.y += io.MouseDelta.y;
+			}
+
+			draw_list->PushClipRect(canvas_p0, canvas_p1, true);
+
+			draw_list->AddLine(ImVec2(canvas_p0.x, origin.y), ImVec2(canvas_p1.x, origin.y), IM_COL32(255, 255, 255, 255));
+			draw_list->AddLine(ImVec2(origin.x, canvas_p0.y), ImVec2(origin.x, canvas_p1.y), IM_COL32(255, 255, 255, 255));
+
+			const float GRID_STEP = 50.0f;
+			for (float x = fmodf(scrolling.x, GRID_STEP); x < canvas_sz.x; x += GRID_STEP)
+				draw_list->AddLine(ImVec2(canvas_p0.x + x, canvas_p0.y), ImVec2(canvas_p0.x + x, canvas_p1.y), IM_COL32(200, 200, 200, 40));
+			for (float y = fmodf(scrolling.y, GRID_STEP); y < canvas_sz.y; y += GRID_STEP)
+				draw_list->AddLine(ImVec2(canvas_p0.x, canvas_p0.y + y), ImVec2(canvas_p1.x, canvas_p0.y + y), IM_COL32(200, 200, 200, 40));
+
+
+			static std::vector<ImVec2> buff;
+
+			auto convert_point = [&](ImVec2 point) -> ImVec2 { return ImVec2(point.x + origin.x, point.y + origin.y); };
+			auto draw_prim     = [&](render_Primitive *p) {
+                if (p->type == render_Lines) {
+                    for (int i = 0; i < p->points.size(); i += 2)
+                        draw_list->AddLine(convert_point(p->points[i]), convert_point(p->points[i + 1]), p->fg);
+                } else if (p->type == render_LineStrip) {
+                    if (p->points.size() < 2)
+                        return;
+                    buff.resize(p->points.size());
+                    for (int i = 0; i < p->points.size(); i++)
+                        buff[i] = convert_point(p->points[i]);
+                    draw_list->AddPolyline(buff.data(), buff.size(), p->fg, ImDrawFlags_Closed, 1.0f);
+                } else if (p->type == render_Polygon) {
+                    if (p->points.size() < 3)
+                        return;
+                    buff.resize(p->points.size());
+                    for (int i = 0; i < p->points.size(); i++)
+                        buff[i] = convert_point(p->points[i]);
+                    draw_list->AddConvexPolyFilled(buff.data(), buff.size(), p->fg);
+                }
+			};
+
+			// Draw bundle
+
+
+			draw_list->PopClipRect();
+		}
+		ig::End();
+
+
+		ui.Render();
+	}
+
+
+	return 0;
+}

types.hpp

@@ -0,0 +1,30 @@
+#pragma once
+
+#include "gui/imgui/imgui.h"
+#include <map>
+#include <vector>
+#include <string>
+#include <cstdint>
+#include <SFML/System.hpp>
+
+
+typedef enum {
+	render_Lines,     // Individial lines
+	render_LineStrip, // Connected lines
+	render_Polygon    // Filled polygon
+} render_PrimitiveType;
+
+
+// render_Primitive describes one render operation.
+typedef struct {
+	// FillMode mode;   // fill mode
+	uint32_t fg, bg; // foreground & background colors
+
+	render_PrimitiveType type;
+	std::vector<ImVec2>  points;
+} render_Primitive;
+
+typedef struct {
+	std::string                   name;
+	std::vector<render_Primitive> prims;
+} render_Bundle;