add imgui support

src/gui/PivotGui.cpp

@@ -0,0 +1,52 @@
+#include "PivotGui.h"
+
+#include <imgui.h>
+
+void PivotGui::Init() {}
+
+void PivotGui::Render() {
+
+	ImGuiIO& io = ImGui::GetIO();
+
+	// Our state
+	static bool show_demo_window = true;
+	static bool show_another_window = false;
+	// 1. Show the big demo window (Most of the sample code is in ImGui::ShowDemoWindow()! You can browse its code to learn more about
+	// Dear ImGui!).
+	if (show_demo_window)
+		ImGui::ShowDemoWindow(&show_demo_window);
+
+	// 2. Show a simple window that we create ourselves. We use a Begin/End pair to create a named window.
+	{
+		static float f = 0.0f;
+		static int counter = 0;
+
+		ImGui::Begin("Hello, world!");	// Create a window called "Hello, world!" and append into it.
+
+		ImGui::Text("This is some useful text.");			// Display some text (you can use a format strings too)
+		ImGui::Checkbox("Demo Window", &show_demo_window);	// Edit bools storing our window open/close state
+		ImGui::Checkbox("Another Window", &show_another_window);
+
+		ImGui::SliderFloat("float", &f, 0.0f, 1.0f);  // Edit 1 float using a slider from 0.0f to 1.0f
+
+		if (ImGui::Button("Button"))  // Buttons return true when clicked (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 / io.Framerate, io.Framerate);
+		ImGui::End();
+	}
+
+	// 3. Show another simple window.
+	if (show_another_window) {
+		ImGui::Begin("Another Window", &show_another_window);  // Pass a pointer to our bool variable (the window will have a closing
+															   // button that will clear the bool when clicked)
+		ImGui::Text("Hello from another window!");
+		if (ImGui::Button("Close Me"))
+			show_another_window = false;
+		ImGui::End();
+	}
+}
+
+void PivotGui::Destroy() {}

src/gui/PivotGui.h

@@ -0,0 +1,9 @@
+#pragma once
+
+namespace PivotGui {
+
+void Init();
+void Render();
+void Destroy();
+
+}  // namespace PivotGui

src/gui/mainGui.cpp

@@ -0,0 +1,174 @@
+// Dear ImGui: standalone example application for SDL2 + OpenGL
+// (SDL is a cross-platform general purpose library for handling windows, inputs, OpenGL/Vulkan/Metal graphics context creation, etc.)
+
+// Learn about Dear ImGui:
+// - FAQ                  https://dearimgui.com/faq
+// - Getting Started      https://dearimgui.com/getting-started
+// - Documentation        https://dearimgui.com/docs (same as your local docs/ folder).
+// - Introduction, links and more at the top of imgui.cpp
+
+#include <SDL2/SDL.h>
+#include <imgui.h>
+#include <imgui_impl_opengl3.h>
+#include <imgui_impl_opengl3_loader.h>
+#include <imgui_impl_sdl2.h>
+#include <stdio.h>
+
+#include "PivotGui.h"
+
+// This example can also compile and run with Emscripten! See 'Makefile.emscripten' for details.
+#ifdef __EMSCRIPTEN__
+#include "../libs/emscripten/emscripten_mainloop_stub.h"
+#endif
+
+// Main code
+int main(int, char**) {
+	// Setup SDL
+	if (SDL_Init(SDL_INIT_VIDEO | SDL_INIT_TIMER | SDL_INIT_GAMECONTROLLER) != 0) {
+		printf("Error: %s\n", SDL_GetError());
+		return -1;
+	}
+
+	// Decide GL+GLSL versions
+#if defined(IMGUI_IMPL_OPENGL_ES2)
+	// GL ES 2.0 + GLSL 100
+	const char* glsl_version = "#version 100";
+	SDL_GL_SetAttribute(SDL_GL_CONTEXT_FLAGS, 0);
+	SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, SDL_GL_CONTEXT_PROFILE_ES);
+	SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 2);
+	SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 0);
+#elif defined(__APPLE__)
+	// GL 3.2 Core + GLSL 150
+	const char* glsl_version = "#version 150";
+	SDL_GL_SetAttribute(SDL_GL_CONTEXT_FLAGS, SDL_GL_CONTEXT_FORWARD_COMPATIBLE_FLAG);	// Always required on Mac
+	SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, SDL_GL_CONTEXT_PROFILE_CORE);
+	SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 3);
+	SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 2);
+#else
+	// GL 3.0 + GLSL 130
+	const char* glsl_version = "#version 130";
+	SDL_GL_SetAttribute(SDL_GL_CONTEXT_FLAGS, 0);
+	SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, SDL_GL_CONTEXT_PROFILE_CORE);
+	SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 3);
+	SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 0);
+#endif
+
+	// From 2.0.18: Enable native IME.
+#ifdef SDL_HINT_IME_SHOW_UI
+	SDL_SetHint(SDL_HINT_IME_SHOW_UI, "1");
+#endif
+
+	// Create window with graphics context
+	SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1);
+	SDL_GL_SetAttribute(SDL_GL_DEPTH_SIZE, 24);
+	SDL_GL_SetAttribute(SDL_GL_STENCIL_SIZE, 8);
+	SDL_WindowFlags window_flags = (SDL_WindowFlags)(SDL_WINDOW_OPENGL | SDL_WINDOW_RESIZABLE | SDL_WINDOW_ALLOW_HIGHDPI);
+	SDL_Window* window = SDL_CreateWindow("Solver Gui", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, 1280, 720, window_flags);
+	if (window == nullptr) {
+		printf("Error: SDL_CreateWindow(): %s\n", SDL_GetError());
+		return -1;
+	}
+
+	SDL_GLContext gl_context = SDL_GL_CreateContext(window);
+	SDL_GL_MakeCurrent(window, gl_context);
+	SDL_GL_SetSwapInterval(1);	// Enable vsync
+
+	// Setup Dear ImGui context
+	IMGUI_CHECKVERSION();
+	ImGui::CreateContext();
+	ImGuiIO& io = ImGui::GetIO();
+	io.ConfigFlags |= ImGuiConfigFlags_NavEnableKeyboard;  // Enable Keyboard Controls
+	io.ConfigFlags |= ImGuiConfigFlags_NavEnableGamepad;   // Enable Gamepad Controls
+
+	// Setup Dear ImGui style
+	ImGui::StyleColorsDark();
+	// ImGui::StyleColorsLight();
+
+	// Setup Platform/Renderer backends
+	ImGui_ImplSDL2_InitForOpenGL(window, gl_context);
+	ImGui_ImplOpenGL3_Init(glsl_version);
+
+	// 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 a nullptr. 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.
+	// - Use '#define IMGUI_ENABLE_FREETYPE' in your imconfig file to use Freetype for higher quality font rendering.
+	// - Read 'docs/FONTS.md' 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 \\ !
+	// - Our Emscripten build process allows embedding fonts to be accessible at runtime from the "fonts/" folder. See
+	// Makefile.emscripten for details.
+	// io.Fonts->AddFontDefault();
+	// io.Fonts->AddFontFromFileTTF("c:\\Windows\\Fonts\\segoeui.ttf", 18.0f);
+	// io.Fonts->AddFontFromFileTTF("../../misc/fonts/DroidSans.ttf", 16.0f);
+	// io.Fonts->AddFontFromFileTTF("../../misc/fonts/Roboto-Medium.ttf", 16.0f);
+	// io.Fonts->AddFontFromFileTTF("../../misc/fonts/Cousine-Regular.ttf", 15.0f);
+	// ImFont* font = io.Fonts->AddFontFromFileTTF("c:\\Windows\\Fonts\\ArialUni.ttf", 18.0f, nullptr,
+	// io.Fonts->GetGlyphRangesJapanese()); IM_ASSERT(font != nullptr);
+
+	ImFontConfig cfg;
+	cfg.SizePixels = 30.0f;
+	io.Fonts->AddFontDefault(&cfg);
+
+	PivotGui::Init();
+
+	// Main loop
+	bool done = false;
+#ifdef __EMSCRIPTEN__
+	// For an Emscripten build we are disabling file-system access, so let's not attempt to do a fopen() of the imgui.ini file.
+	// You may manually call LoadIniSettingsFromMemory() to load settings from your own storage.
+	io.IniFilename = nullptr;
+	EMSCRIPTEN_MAINLOOP_BEGIN
+#else
+	while (!done)
+#endif
+	{
+		// Poll and handle events (inputs, window resize, etc.)
+		// 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, or clear/overwrite your copy
+		// of the mouse data.
+		// - When io.WantCaptureKeyboard is true, do not dispatch keyboard input data to your main application, or clear/overwrite your
+		// copy of the keyboard data. Generally you may always pass all inputs to dear imgui, and hide them from your application based
+		// on those two flags.
+		SDL_Event event;
+		while (SDL_PollEvent(&event)) {
+			ImGui_ImplSDL2_ProcessEvent(&event);
+			if (event.type == SDL_QUIT)
+				done = true;
+			if (event.type == SDL_WINDOWEVENT && event.window.event == SDL_WINDOWEVENT_CLOSE &&
+				event.window.windowID == SDL_GetWindowID(window))
+				done = true;
+		}
+
+		// Start the Dear ImGui frame
+		ImGui_ImplOpenGL3_NewFrame();
+		ImGui_ImplSDL2_NewFrame();
+		ImGui::NewFrame();
+
+		PivotGui::Render();
+
+		// Rendering
+		ImGui::Render();
+		glViewport(0, 0, (int)io.DisplaySize.x, (int)io.DisplaySize.y);
+		glClear(GL_COLOR_BUFFER_BIT);
+		ImGui_ImplOpenGL3_RenderDrawData(ImGui::GetDrawData());
+		SDL_GL_SwapWindow(window);
+	}
+#ifdef __EMSCRIPTEN__
+	EMSCRIPTEN_MAINLOOP_END;
+#endif
+
+	// Cleanup
+	ImGui_ImplOpenGL3_Shutdown();
+	ImGui_ImplSDL2_Shutdown();
+	ImGui::DestroyContext();
+
+	SDL_GL_DeleteContext(gl_context);
+	SDL_DestroyWindow(window);
+	SDL_Quit();
+
+	return 0;
+}

xmake.lua

@@ -1,5 +1,8 @@
 add_rules("mode.debug", "mode.release")
 
+add_requires("libsdl >= 2")
+add_requires("imgui", {configs = {sdl2_no_renderer = true, opengl3 = true}})
+
 set_languages("c++17")
 
 -- Solver Library
@@ -17,9 +20,19 @@ target("PivotMain")
     set_rundir("$(projectdir)/matricies")
     add_files("src/main.cpp")
     add_deps("Pivot")
+    set_default(false)
+
+
+
+
+
+-- Gui interface
+target("PivotGui")
+    set_rundir("$(projectdir)")
+    add_files("src/gui/*.cpp")
+    add_deps("Pivot")
     set_default(true)
-
+    add_packages("libsdl", "imgui")
-