Add an imgui-based debug ui

config.toml

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+style = "../uistyles/basic.toml"

src/gui.cpp

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+#include <vector>
+#include <iostream>
+#include <assert.h>
+#include <imgui.h>
+#include <nfd.h>
+#include "gui.h"
+#include "project.h"
+
+
+void Gui::render() {
+	if (imgui_demo_open) ImGui::ShowTestWindow(&imgui_demo_open);
+	if (project_overlay_open) this->render_project_overlay();
+	this->render_menubar();
+}
+
+void Gui::render_menubar() {
+	if (ImGui::BeginMainMenuBar()) {
+		if (ImGui::BeginMenu("File"))
+			render_mmb_file();
+
+		if (ImGui::BeginMenu("View"))
+			render_mmb_view();
+
+		if (ImGui::BeginMenu("Debug"))
+			render_mmb_debug();
+
+		ImGui::EndMainMenuBar();
+	}
+}
+
+void Gui::render_project_overlay() {
+	ImGui::SetNextWindowPos(ImVec2(20, 30));
+    if (ImGui::Begin("", &this->project_overlay_open, ImVec2(200,0), 0.3f, ImGuiWindowFlags_NoTitleBar|ImGuiWindowFlags_NoResize|ImGuiWindowFlags_NoMove|ImGuiWindowFlags_NoSavedSettings)) {
+    	ImGui::Text("[project]");
+    	ImGui::Separator();
+    	if (state->current_project != nullptr) {
+    		ImGui::Text("name: %s", state->current_project->name.c_str());
+    		ImGui::Text("n_scenes: %i", state->current_project->scenes.size());
+    		if (!state->current_project->scene_loaded) {
+    			ImGui::Text("no scene loaded");
+    		} else {
+    			ImGui::Text("current scene: %s",
+    				state->current_project->current_scene->name.c_str());
+    		}
+    	} else {
+    		ImGui::Text("no project loaded.");
+    	}
+    	ImGui::End();
+    }
+}
+
+void Gui::render_mmb_file() {
+	if (ImGui::MenuItem("Load project", "CTRL+O")) {
+		nfdchar_t *out_path = nullptr;
+		nfdresult_t result = NFD_OpenDialog(NULL, NULL, &out_path);
+		if (result == NFD_OKAY) {
+			// Load project
+			auto new_project = Project::fromFile(std::string(out_path));
+			state->current_project = std::move(new_project);
+
+			free(out_path);
+		} else if (result == NFD_ERROR) {
+			std::cout << "Error in filepicker: " << NFD_GetError() << '\n';
+		}
+	}
+
+	ImGui::Separator();
+	if (ImGui::MenuItem("Exit", "CTRL+Q"))
+		state->running = false;
+
+	ImGui::EndMenu();
+}
+
+void Gui::render_mmb_view() {
+	ImGui::MenuItem("Show project meta overlay", NULL, &this->project_overlay_open);
+
+	ImGui::Separator();
+
+	if (ImGui::MenuItem("Reload ImGui styling"))
+		this->load_style(cpptoml::parse_file(state->config->stylepath));
+
+	ImGui::MenuItem("Show ImGui demo window", NULL, &this->imgui_demo_open);
+
+	ImGui::EndMenu();
+}
+
+void Gui::render_mmb_debug() {
+	ImGui::MenuItem("Profiler");
+	
+	if (ImGui::MenuItem("Reload shaders", "CTRL+R")) {
+		if (state->current_project != nullptr) {
+			if (state->current_project->scene_loaded) {
+				std::cout << "=== reloading shaders ===\n";
+				state->current_project->shader_bundle->recompile().link();
+			}
+		}
+	}
+
+	ImGui::EndMenu();
+}
+
+
+static cpptoml::option<ImVec2> vec2im2(cpptoml::option<std::vector<double>> vec) {
+	if (vec) {
+		assert((*vec).size() == 2);
+		return ImVec2((*vec)[0], (*vec)[1]);
+	} else {
+		return cpptoml::option<ImVec2>();
+	}
+}
+
+static cpptoml::option<ImVec4> vec2im4(cpptoml::option<std::vector<double>> vec) {
+	if (vec) {
+		assert((*vec).size() == 4);
+		return ImVec4((*vec)[0], (*vec)[1], (*vec)[2], (*vec)[3]);
+	} else {
+		return cpptoml::option<ImVec4>();
+	}
+}
+
+#define st_lds_d(n, k) style.n = conf->get_qualified_as<double>(k).value_or(defaultstyle.n)
+#define st_lds_v2(n, k) style.n = vec2im2(conf->get_qualified_array_of<double>(k)).value_or(defaultstyle.n)
+#define st_lds_v4(n, k) style.n = vec2im4(conf->get_qualified_array_of<double>(k)).value_or(defaultstyle.n)
+
+
+void Gui::load_style(std::shared_ptr<cpptoml::table> conf) {
+	ImGuiStyle &style = ImGui::GetStyle();
+	auto defaultstyle = ImGuiStyle();
+
+	st_lds_d(Alpha, "alpha");
+	st_lds_v2(WindowPadding, "window.padding");
+	st_lds_v2(WindowMinSize, "window.min_size");
+	st_lds_d(WindowRounding, "window.rounding");
+	st_lds_v2(WindowTitleAlign, "window.title_align");
+	st_lds_d(ChildWindowRounding, "window.child_rounding");
+	st_lds_v2(FramePadding, "frame.padding");
+	st_lds_d(FrameRounding, "frame.rounding");
+}

src/gui.h

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+#pragma once
+
+#include "state.h"
+#include <memory>
+#include <cpptoml.h>
+
+class Gui {
+public:
+	Gui(DemoState *state) :
+		perf_open(false),
+		state(state)
+		{
+			this->load_style(cpptoml::parse_file(state->config->stylepath));
+		}
+
+	void render();
+
+	bool perf_open = false;
+	bool project_overlay_open = true;
+
+	bool imgui_demo_open = false;
+
+private:
+	DemoState *state;
+
+	void render_project_overlay();
+
+	void render_menubar();
+	void render_mmb_file();
+	void render_mmb_view();
+	void render_mmb_debug();
+
+	void load_style(std::shared_ptr<cpptoml::table> style);
+};
+

uistyles/basic.toml

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+alpha=0.95