fggl/gfx/ogl4/setup.cpp

+/*
+ * This file is part of FGGL.
+ *
+ * FGGL is free software: you can redistribute it and/or modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any
+ * later version.
+ *
+ * FGGL is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License along with FGGL.
+ * If not, see <https://www.gnu.org/licenses/>.
+ */
+
+//
+// Created by webpigeon on 24/07/22.
+//
+
+#include "fggl/gfx/ogl4/setup.hpp"
+
+namespace fggl::gfx::ogl4 {
+
+	auto WindowGraphics::create(display::Window &window) -> Graphics * {
+		return new OpenGL4Backend(m_storage, m_fonts, m_assets, (GlFunctionLoader)glfwGetProcAddress);
+	}
+
+}
\ No newline at end of file

fggl/gfx/rendering.hpp

-#ifndef FGGL_GFX_RENDERING_H
-#define FGGL_GFX_RENDERING_H
-
-/**
- * Ensure Graphics libraries are in the right order.
- */
-
-#include <GL/glew.h>
-#include <GLFW/glfw3.h>
-
-#endif

fggl/gfx/window.cpp

+/*
+ * This file is part of FGGL.
+ *
+ * FGGL is free software: you can redistribute it and/or modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any
+ * later version.
+ *
+ * FGGL is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License along with FGGL.
+ * If not, see <https://www.gnu.org/licenses/>.
+ */
 
-#include "window.hpp"
+#include <utility>
+
+#include "fggl/display/glfw/window.hpp"
+#include "fggl/display/glfw/window_input.hpp"
+#include "fggl/debug/logging.hpp"
 
-#include <iostream>
 #include <string>
 #include <stdexcept>
-
 #include <GLFW/glfw3.h>
 
-using namespace fggl::gfx;
+namespace fggl::display::glfw {
+
+	static void glfw_error(int code, const char *description) {
+		debug::log(debug::Level::error, "[GLFW] {}: {}", code, description);
+	}
+
+	static void framebuffer_resize(GLFWwindow *window, int width, int height) {
+		auto *fgglWindow = static_cast<Window *>(glfwGetWindowUserPointer(window));
+		fgglWindow->framesize(width, height);
+	}
+
+	static void fggl_input_cursor(GLFWwindow *window, double xPos, double yPos) {
+		auto &input = GlfwInputManager::instance();
+		auto *fgglWin = static_cast<Window *>(glfwGetWindowUserPointer(window));
+
+		#ifndef FGGL_INPUT_SCREEN_COORDS
+		// convert to nice ranges...
+		xPos = (xPos / fgglWin->width() * 2) - 1.0; // [-1, 1]
+		yPos = (yPos / fgglWin->height() * 2) - 1.0; // [-1, 1]
+		#endif
+
+		// inform the input system
+		input.onMouseMove(xPos, yPos);
+	}
+
+	static void fggl_input_scroll(GLFWwindow */*window*/, double xPos, double yPos) {
+		auto &input = GlfwInputManager::instance();
+		input.onMouseScroll(xPos, yPos);
+	}
+
+	static void fggl_input_mouse_btn(GLFWwindow */*window*/, int btn, int action, int /*mods*/) {
+		auto &input = GlfwInputManager::instance();
+		input.onMouseButton(btn, action == GLFW_PRESS);
+	}
+
+	static void fggl_input_keyboard(GLFWwindow */*window*/, int /*key*/, int scancode, int action, int /*mods*/) {
+		auto &input = GlfwInputManager::instance();
+		input.onKeyEvent(scancode, action == GLFW_PRESS || action == GLFW_REPEAT);
+	}
+
+	static void fggl_update_joystick(fggl::input::GamepadInput &input, int jid) {
+		bool isGamepad = (glfwJoystickIsGamepad(jid) == GLFW_TRUE);
+
+		if (isGamepad) {
+			if (!input.present(jid)) {
+				std::string name = glfwGetJoystickName(jid);
+				input.setActive(jid, true);
+				input.name(jid, name);
+			}
+
+			GLFWgamepadstate state;
+			glfwGetGamepadState(jid, &state);
+
+			fggl::input::GamepadState gamepadState;
+			for (int i = 0; i <= GLFW_GAMEPAD_BUTTON_LAST; i++) {
+				gamepadState.buttons[i] = state.buttons[i];
+			}
 
-static void glfw_error(int code, const char* description) {
-	std::cerr << "[GLFW] " << code << " " << description << std::endl;
-}
+			for (int i = 0; i <= GLFW_GAMEPAD_AXIS_LAST; i++) {
+				gamepadState.axes[i] = state.axes[i];
+			}
 
-Context::Context() {
-	int state = glfwInit();
-	if ( state == GLFW_FALSE ) {
-		const char** error;
-		int code = glfwGetError(error);
-		throw std::runtime_error( *error );
+			input.update(jid, gamepadState);
+		} else {
+			input.setActive(jid, false);
+		}
 	}
-}
 
-Context::~Context() {
-	glfwTerminate();
-}
+	static void fggl_joystick_poll() {
+		auto &input = GlfwInputManager::instance();
+		if (!input.alive()) {
+			return;
+		}
 
-void Context::pollEvents() {
-	glfwPollEvents();
-}
+		auto &gamepadCtl = input.gamepads();
+		for (int jid = 0; jid < GLFW_JOYSTICK_LAST; jid++) {
+			if (glfwJoystickPresent(jid) == GLFW_TRUE) {
+				fggl_update_joystick(gamepadCtl, jid);
+			} else {
+				gamepadCtl.setActive(jid, false);
+			}
+		}
+	}
 
-Window::Window() : m_window(nullptr), m_input(nullptr) {
-	m_window = glfwCreateWindow(1920, 1080, "main", NULL, NULL);
-	glfwSetWindowUserPointer(m_window, this);
-}
+	static void fggl_joystick(int jid, int state) {
+		auto &input = GlfwInputManager::instance();
+		if (!input.alive()) {
+			return;
+		}
 
-Window::~Window() {
-	if ( m_window != nullptr ) {
-		glfwDestroyWindow(m_window);
-		m_window = nullptr;
+		auto &gamepadCtl = input.gamepads();
+		if (state == GLFW_CONNECTED) {
+			fggl_update_joystick(gamepadCtl, jid);
+		} else {
+			gamepadCtl.setActive(jid, false);
+		}
 	}
-}
 
-void Window::activate() {
-	assert( m_window != nullptr );
-	glfwMakeContextCurrent(m_window);
-}
+	GlfwContext::GlfwContext(fggl::input::Input *input) {
+		debug::log(debug::Level::info, "[GLFW] Initializing...");
+		auto &glfwCallbacks = GlfwInputManager::instance();
+		glfwCallbacks.setup(input);
+
+		glfwInitHint(GLFW_JOYSTICK_HAT_BUTTONS, GLFW_FALSE);
+		glfwSetErrorCallback(glfw_error);
+
+		int state = glfwInit();
+		if (state == GLFW_FALSE) {
+			const char **error = nullptr;
+			glfwGetError(error);
+			throw std::runtime_error(*error);
+		}
 
-void Window::swap() {
-	assert( m_window != nullptr );
-	glfwSwapBuffers(m_window);
-}
+		// joysticks are global
+		fggl_joystick_poll();
+		glfwSetJoystickCallback(fggl_joystick);
+		debug::log(debug::Level::info, "[GLFW] Initialization complete.");
+	}
+
+	GlfwContext::~GlfwContext() {
+		glfwTerminate();
+		debug::trace("[glfw] context terminated");
+	}
+
+	void GlfwContext::pollEvents() {
+		auto &glfwCallbacks = GlfwInputManager::instance();
+		glfwCallbacks.frame();
+
+		glfwPollEvents();
+		fggl_joystick_poll();
+	}
+
+	Window::Window(std::shared_ptr<GlfwContext> context, gfx::WindowGraphics *graphics)
+		: m_context(std::move(context)), m_window(nullptr), m_framesize() {
+
+		// don't iconify when focus is lost.
+		glfwWindowHint( GLFW_AUTO_ICONIFY, GLFW_FALSE );
+
+		// FIXME - this ties the graphics API before window creation
+		auto graphicsConfig = graphics->config();
+		if (graphicsConfig.api == gfx::GraphicsAPI::OpenGL) {
+			glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, graphicsConfig.majorVersion);
+			glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, graphicsConfig.minorVersion);
+			glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
+			glfwWindowHint(GLFW_OPENGL_DEBUG_CONTEXT, graphicsConfig.debug ? GLFW_TRUE : GLFW_FALSE);
+		}
+
+		m_window = glfwCreateWindow(1920, 1080, "main", nullptr, nullptr);
+		if (m_window == nullptr) {
+			return;
+		}
+
+		glfwSetWindowUserPointer(m_window, this);
+
+		// setup callback wrappers (will invoke the methods via the user ptr above)
+		glfwSetFramebufferSizeCallback(m_window, framebuffer_resize);
+		glfwSetScrollCallback(m_window, fggl_input_scroll);
+		glfwSetCursorPosCallback(m_window, fggl_input_cursor);
+		glfwSetMouseButtonCallback(m_window, fggl_input_mouse_btn);
+		glfwSetKeyCallback(m_window, fggl_input_keyboard);
+
+		// bind the graphics API
+		glfwMakeContextCurrent(m_window);
+		m_graphics = graphics->createMain(*this);
+	}
+
+	Window::~Window() {
+		if ( m_graphics != nullptr ) {
+			delete m_graphics;
+			m_graphics = nullptr;
+		}
+
+		if (m_window != nullptr) {
+			// prevent dangling pointers
+			glfwSetWindowUserPointer(m_window, nullptr);
+			glfwDestroyWindow(m_window);
+			m_window = nullptr;
+		}
+	}
+
+	void Window::frameStart() {
+		assert(m_window != nullptr);
+		assert(m_graphics != nullptr);
+
+		glfwMakeContextCurrent(m_window);
+		m_graphics->clear();
+	}
+
+	void Window::frameEnd() {
+		glfwSwapBuffers(m_window);
+	}
+
+	void Window::activate() const {
+		assert(m_window != nullptr);
+		glfwMakeContextCurrent(m_window);
+	}
+
+	auto Window::frameSize() const -> fggl::math::vec2i {
+		assert(m_window != nullptr);
+		math::vec2i size;
+		glfwGetFramebufferSize(m_window, &size.x, &size.y);
+		return size;
+	}
+
+	auto Window::wantClose() const -> bool {
+		assert(m_window != nullptr);
+		return glfwWindowShouldClose(m_window) == GLFW_TRUE;
+	}
+}
\ No newline at end of file

fggl/gfx/window.hpp

-#ifndef FGGL_GFX_H
-#define FGGL_GFX_H
-
-#include <cassert>
-#include <string>
-
-#include <fggl/gfx/rendering.hpp>
-
-namespace fggl::gfx {
-
-	class Context {
-		public:
-			Context();
-			~Context();
-
-			void pollEvents();
-	};
-
-	class Input {
-		private:
-	};
-
-	enum MutWindowHint {
-		Decorated = GLFW_DECORATED,
-		Resizable = GLFW_RESIZABLE,
-		Floating = GLFW_FLOATING,
-		AutoIconify = GLFW_AUTO_ICONIFY,
-		FocusOnShow = GLFW_FOCUS_ON_SHOW
-	};
-	enum WindowHint {
-		Focused = GLFW_FOCUSED,
-		Iconified = GLFW_ICONIFIED,
-		Maximised = GLFW_MAXIMIZED,
-		Hovered = GLFW_HOVERED,
-		Visible = GLFW_VISIBLE,
-		Transparent = GLFW_TRANSPARENT_FRAMEBUFFER,
-
-		GlForwardCompat = GLFW_OPENGL_FORWARD_COMPAT,
-		GlDebugContext = GLFW_OPENGL_DEBUG_CONTEXT,
-		NoError = GLFW_CONTEXT_NO_ERROR
-	};
-	class Window {
-		public:
-			Window();
-			~Window();
-
-			// window <-> opengl stuff
-			void activate();
-			void swap();
-
-			// window manager stuff
-			inline bool closeRequested() const {
-				assert( m_window != nullptr );
-				return glfwWindowShouldClose(m_window);
-			}
-
-			inline void title(const std::string& title) {
-				assert( m_window != nullptr );
-				glfwSetWindowTitle( m_window, title.c_str() );
-			}
-
-			inline bool fullscreen() const {
-				assert( m_window != nullptr );
-				return glfwGetWindowMonitor( m_window ) != NULL;
-			}
-
-			inline void fullscreen(bool state) {
-				assert( m_window != nullptr );
-				if ( state ) {
-					auto monitor = glfwGetPrimaryMonitor();
-					const auto mode = glfwGetVideoMode( monitor );
-					glfwSetWindowMonitor( m_window, monitor,
-							0, 0,
-							mode->width, mode->height,
-							mode->refreshRate);
-				} else {
-					glfwSetWindowMonitor( m_window, NULL,
-							0, 0,
-							800, 600, 0);
-				}
-			}
-
-			inline bool checkHint(WindowHint hint) const {
-				return check_hint(hint);
-			}
-
-			inline bool checkHint(MutWindowHint hint) const {
-				return check_hint(hint);
-			}
-
-			inline void setHint(MutWindowHint hint, bool state) {
-				set_hint(hint, state);
-			}
-
-			inline void visible(bool state) {
-				assert( m_window != nullptr );
-				if ( state ) {
-					glfwShowWindow( m_window );
-				} else {
-					glfwHideWindow( m_window );
-				}
-			}
-
-		private:
-			GLFWwindow* m_window;
-			Input* m_input;
-
-			inline void set_hint(int hint, bool state) const {
-				assert( m_window != nullptr );
-				glfwSetWindowAttrib( m_window, hint, state );
-			}
-
-			inline bool check_hint(int hint) const {
-				assert( m_window != nullptr );
-				return glfwGetWindowAttrib( m_window, hint) == GLFW_TRUE;
-			}
-	};
-
-}
-
-#endif

fggl/grid/CMakeLists.txt

+target_sources( fggl
+    PRIVATE
+        hexagon.cpp
+)
\ No newline at end of file

fggl/grid/hexagon.cpp

+/*
+ * This file is part of FGGL.
+ *
+ * FGGL is free software: you can redistribute it and/or modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any
+ * later version.
+ *
+ * FGGL is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License along with FGGL.
+ * If not, see <https://www.gnu.org/licenses/>.
+ */
+
+//
+// Created by webpigeon on 10/12/22.
+//
+
+#include "fggl/grid/hexagon.hpp"
+
+namespace fggl::grid {
+
+	std::vector<IntHex> lineTo(const IntHex& start, const IntHex& end) {
+		const int distance = start.distance(end);
+		std::vector<IntHex> line;
+		for (auto i=0; i < distance; ++i) {
+			line.push_back( round2(hexLerp(start, end, 1.0F/distance * i)) );
+		}
+		return line;
+	}
+
+} // namespace fggl:grid

fggl/gui/CMakeLists.txt

+target_sources( ${PROJECT_NAME}
+    PRIVATE
+        widget.cpp
+        widgets.cpp
+        containers.cpp
+        fonts.cpp
+
+        model/parser.cpp
+        model/structure.cpp
+        renderer/renderer.cpp
+)
+
+find_package(Freetype)
+target_link_libraries(${PROJECT_NAME} PUBLIC Freetype::Freetype)
+

fggl/gui/containers.cpp

+/*
+ * This file is part of FGGL.
+ *
+ * FGGL is free software: you can redistribute it and/or modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any
+ * later version.
+ *
+ * FGGL is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License along with FGGL.
+ * If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include <fggl/gui/containers.hpp>
+#include <spdlog/spdlog.h>
+
+namespace fggl::gui {
+
+	auto Container::getChildAt(const math::vec2 &point) -> Widget * {
+		for (auto &child : m_children) {
+			if (child->contains(point)) {
+				return child->getChildAt(point);
+			}
+		}
+
+		return nullptr;
+	}
+
+	auto Container::contains(const math::vec2 &point) -> bool {
+		return true;
+	}
+
+	void Container::render(gfx::Paint &paint) {
+		for (auto &child : m_children) {
+			child->render(paint);
+		}
+	}
+
+	void Container::add(std::unique_ptr<Widget> widget) {
+		m_children.push_back(std::move(widget));
+		m_dirty = true;
+	}
+
+	void Container::onMouseOver(math::vec2 pos) {
+		Widget::onMouseOver(pos);
+		auto* childHover = getChildAt(pos);
+
+		for ( auto& child : m_children) {
+			if ( child.get() != childHover ) {
+				child->onExit(pos);
+			}
+		}
+
+		if ( childHover != nullptr ) {
+			childHover->onMouseOver(pos);
+		}
+	}
+
+	void Container::onEnter(math::vec2i pos) {
+		Widget::onEnter(pos);
+		for ( auto& child : m_children ) {
+			if ( child->contains(pos)) {
+				child->onEnter(pos);
+			}
+		}
+	}
+
+	void Container::onExit(math::vec2i pos) {
+		Widget::onExit(pos);
+		for ( auto& child : m_children) {
+			child->onExit(pos);
+		}
+	}
+
+	GridBox::GridBox(uint32_t rows, uint32_t cols, uint32_t padx, uint32_t pady) : m_rows(rows), m_cols(cols), m_padding(padx, pady) {}
+
+	void GridBox::layout() {
+		assert( m_rows != 0 || m_cols != 0 );
+
+		if ( m_rows == 0 ) {
+			int rows = m_children.size() / m_cols;
+
+			// figure out the width and heights
+			auto* widths = new float[m_cols]{0.0F};
+			auto* heights = new float[rows]{0.0F};
+			for ( auto idx = 0U; idx < m_children.size(); ++idx) {
+				auto& child = m_children[idx];
+				int col = idx % m_cols;
+				int row = idx / m_cols;
+
+				widths[col] = std::max( child->size().x, widths[col] );
+				heights[row] = std::max( child->size().y, heights[row] );
+			}
+
+			// populate the grid
+			fggl::math::vec2i pos{0, 0};
+			unsigned int row = 0;
+			unsigned int col = 0;
+			for ( auto& child : m_children ) {
+				fggl::math::vec2i size{ widths[col], heights[row] };
+				child->size(pos, size);
+				child->layout();
+
+				// next iter
+				pos.x += size.x + m_padding.x;
+				col++;
+				if ( col == m_cols ) {
+					col = 0;
+					row++;
+					pos.x = 0;
+					pos.y += size.y + m_padding.y;
+				}
+			}
+
+			// cleanup variables
+			delete[] widths;
+			delete[] heights;
+		}
+	}
+
+
+	/*
+	Box::Box( LayoutAxis axis ) : m_axis( axis ) {}
+	
+	void Box::layout() {
+		math::vec2 baseSize{};
+		
+		const int mainAxis = 0;
+		const int crossAxis = 1;
+		
+		// ask for preferred sizes
+		for ( auto& child : m_children ) {
+			auto childBaseSize = child.baseSize();
+			
+			baseSize[mainAxis] += childBaseSize[mainAxis];
+			if ( childBaseSize[crossAxis] > baseSize[crossAxis] ) {
+				baseSize[crossAxis] = childBaseSize[crossAxis];			
+			}
+		}
+		
+		if ( lineAxis == 0 )
+			setSize(lineSum, biggestCross);
+		else
+			setSize(biggestCross, lineSum);
+	}*/
+
+	void Panel::render(gfx::Paint &paint) {
+		// background painting time
+		gfx::Path2D background(topLeft());
+		background.colour(math::vec3(32.0F / 255.0F, 74.0F / 255.0F, 135.0F / 255.0F));
+		draw_box(background, topLeft(), bottomRight());
+		paint.fill(background);
+
+		// call parent's render method for child objects
+		Container::render(paint);
+	}
+};

fggl/gui/fonts.cpp

+/*
+ * This file is part of FGGL.
+ *
+ * FGGL is free software: you can redistribute it and/or modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any
+ * later version.
+ *
+ * FGGL is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License along with FGGL.
+ * If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include "fggl/gui/fonts.hpp"
+
+namespace fggl::gui {
+
+	FontFace::FontFace(FT_Face face) : m_face(face) {
+	}
+
+	FontFace::~FontFace() {
+		FT_Done_Face(m_face);
+	}
+
+	FontLibrary::FontLibrary(data::Storage *storage) : m_context(nullptr), m_storage(storage) {
+		FT_Init_FreeType(&m_context);
+		m_defaultFont = getFont(DEFAULT_FONT_NAME);
+	}
+
+	FontLibrary::~FontLibrary() {
+		// free all fonts
+		m_defaultFont = nullptr;
+		m_cache.clear();
+
+		// shut the library down
+		FT_Done_FreeType(m_context);
+	}
+
+	auto FontFace::populateMetrics(char letter) -> GlyphMetrics & {
+		if (FT_Load_Char(m_face, letter, FT_LOAD_RENDER)) {
+			// something bad happened
+			return m_metrics['?'];
+		}
+
+		GlyphMetrics metrics{
+			{m_face->glyph->bitmap.width, m_face->glyph->bitmap.rows},
+			{m_face->glyph->bitmap_left, m_face->glyph->bitmap_top},
+			m_face->glyph->advance.x
+		};
+
+		// return the new metrics data
+		auto it = m_metrics.emplace(letter, metrics);
+		return it.first->second;
+	}
+
+	void FontFace::texture(char letter, int &width, int &height, unsigned char **buff) {
+		if (FT_Load_Char(m_face, letter, FT_LOAD_RENDER)) {
+			// something bad happened
+			return;
+		}
+
+		width = m_face->glyph->bitmap.width;
+		height = m_face->glyph->bitmap.rows;
+		*buff = m_face->glyph->bitmap.buffer;
+	}
+} // namespace fggl::fonts
\ No newline at end of file

fggl/gui/model/parser.cpp

+/*
+ * This file is part of FGGL.
+ *
+ * FGGL is free software: you can redistribute it and/or modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any
+ * later version.
+ *
+ * FGGL is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License along with FGGL.
+ * If not, see <https://www.gnu.org/licenses/>.
+ */
+
+//
+// Created by webpigeon on 11/03/23.
+//
+
+#include "fggl/gui/model/parser.hpp"
+#include <yaml-cpp/yaml.h>
+
+namespace fggl::gui::model {
+
+	Widget* YamlToWidgetTree(WidgetFactory& factory, const YAML::Node& config) {
+		Widget* root;
+		if ( config["template"] ) {
+			root = factory.build( config["template"].as<std::string>());
+		} else {
+			root = factory.buildEmpty();
+		}
+
+		// deal with attrs
+		for ( auto attr : config["attrs"] ) {
+			root->set(attr.first.as<std::string>(), attr.second.as<std::string>());
+		}
+
+		// deal with child nodes
+		for ( auto child : config["children"] ) {
+			Widget* childWidget = YamlToWidgetTree(factory, child);
+			root->addChild(*childWidget);
+		}
+
+		// are we a template definition?
+		if ( config["define"] ) {
+			factory.push( config["define"].as<std::string>(), std::move(*root) );
+			return factory.getTemplate( config["define"].as<std::string>() );
+		}
+
+		return root;
+	}
+
+	inline Widget* parseFile(WidgetFactory& factory, const std::string& path) {
+		YAML::Node root = YAML::LoadFile(path);
+		if ( !root ){
+			return nullptr;
+		}
+		return YamlToWidgetTree(factory, root);
+	}
+
+}
\ No newline at end of file

fggl/gui/model/structure.cpp

+/*
+ * This file is part of FGGL.
+ *
+ * FGGL is free software: you can redistribute it and/or modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any
+ * later version.
+ *
+ * FGGL is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License along with FGGL.
+ * If not, see <https://www.gnu.org/licenses/>.
+ */
+
+//
+// Created by webpigeon on 11/03/23.
+//
+
+#include "fggl/gui/model/structure.hpp"
+#include "fggl/gui/fonts.hpp"
+
+#include <algorithm>
+#include <utility>
+#include <string>
+
+namespace fggl::gui::model {
+
+	math::vec2 calcTextBounds(const std::string& value, std::shared_ptr<FontFace> face) {
+		if ( face == nullptr ){
+			debug::warning("No preferred font sent, cowardly refusing to process text");
+			return {};
+		}
+
+		math::vec2 max{0, 0};
+		for (auto letter : value) {
+			auto metrics = face->metrics(letter);
+
+			max.x += metrics.size.x + (metrics.advance >> 6);
+			max.y = std::max(max.y, metrics.size.y);
+		}
+		return max;
+	}
+
+	inline math::vec2 calcBoxContrib(const Widget& widget, const std::string& name) {
+		return math::vec2{
+			widget.get_or_default<float>( name + "::left") + widget.get_or_default<float>(name + "::right"),
+			widget.get_or_default<float>( name + "::top" ) + widget.get_or_default<float>( name + "::bottom" )
+		};
+	}
+
+	void Widget::calcPrefSize(std::shared_ptr<FontFace> face) {
+		if ( !m_dirty ){
+			return;
+		}
+
+		auto padding = calcBoxContrib( *this, "padding");
+		auto border = calcBoxContrib( *this, "border");
+		auto content = math::vec2{0,0};
+
+		if (hasAttr("text")) {
+			content += calcTextBounds( get<std::string>("text"), std::move(face) );
+		}
+
+		m_cachedSize = padding + content + content;
+		debug::info("my preferred size is: ({}, {})", m_cachedSize.x, m_cachedSize.y);
+
+		m_dirty = false;
+	}
+
+}
\ No newline at end of file

fggl/gui/renderer/renderer.cpp

+/*
+ * This file is part of FGGL.
+ *
+ * FGGL is free software: you can redistribute it and/or modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any
+ * later version.
+ *
+ * FGGL is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License along with FGGL.
+ * If not, see <https://www.gnu.org/licenses/>.
+ */
+
+//
+// Created by webpigeon on 11/03/23.
+//
+
+#include "fggl/gui/renderer/renderer.hpp"
+
+namespace fggl::gui::renderer {
+
+	constexpr int PADDING = 15;
+
+	void draw_box(gfx::Path2D &path, glm::vec2 topLeft, glm::vec2 bottomRight) {
+		path.moveTo({topLeft.x, topLeft.y});
+		path.pathTo({bottomRight.x, topLeft.y});
+		path.pathTo({bottomRight.x, bottomRight.y});
+		path.pathTo({topLeft.x, bottomRight.y});
+		path.pathTo({topLeft.x, topLeft.y});
+	}
+
+	void draw_border_patch(gfx::Paint& paint, Box& bounds, Box& size, math::vec3 colour) {
+		gfx::Path2D path({0,0});
+
+		path.colour(colour);
+		// draw edges
+		draw_box(path, {bounds.left + size.left, bounds.top}, {bounds.right - size.right, bounds.top + size.top} );
+		draw_box(path, {bounds.right - size.right, bounds.top + size.top}, {bounds.right, bounds.bottom - size.bottom} );
+		draw_box(path, {bounds.left + size.left, bounds.bottom - size.bottom}, {bounds.right - size.right, bounds.bottom} );
+		draw_box(path, {bounds.left, bounds.top + size.top}, {bounds.left + size.left, bounds.bottom - size.bottom} );
+
+		// draw-corners
+		draw_box(path, {bounds.left, bounds.top}, {bounds.left + size.left, bounds.top + size.top} );
+		draw_box(path, {bounds.right - size.right, bounds.top}, {bounds.right, bounds.top + size.top} );
+		draw_box(path, {bounds.left, bounds.bottom - size.bottom}, {bounds.left + size.left, bounds.bottom} );
+		draw_box(path, {bounds.right - size.right, bounds.bottom - size.bottom}, {bounds.right, bounds.bottom});
+		paint.fill(path);
+	}
+
+	void draw_border_solid(gfx::Paint& paint, Box& bounds, Box& size, math::vec3 colour) {
+		gfx::Path2D path({0,0});
+
+		path.colour(colour);
+		// draw edges
+		draw_box(path, {bounds.left, bounds.top}, {bounds.right, bounds.top + size.top} );
+		draw_box(path, {bounds.right - size.right, bounds.top + size.top}, {bounds.right, bounds.bottom - size.bottom} );
+		draw_box(path, {bounds.left, bounds.bottom - size.bottom}, {bounds.right, bounds.bottom} );
+		draw_box(path, {bounds.left, bounds.top + size.top}, {bounds.left + size.left, bounds.bottom - size.bottom} );
+
+		paint.fill(path);
+	}
+
+	void draw_background_solid(gfx::Paint& paint, Box& bounds, math::vec3 colour) {
+		gfx::Path2D path({0,0});
+		path.colour(colour);
+		draw_box(path, {bounds.left, bounds.top}, {bounds.right, bounds.bottom} );
+		paint.fill(path);
+	}
+
+	void layout(model::Widget& current) {
+		if ( current.isLeaf() ) {
+			// if the widget has a defined size, use that
+			if ( current.hasAttr("size") && !current.hasAttr("text") ) {
+				return;
+			}
+
+			// else, use the model's preferred size
+			auto preferred = current.preferredSize();
+			if ( preferred.has_value() ) {
+				current.set<math::vec2>("size", preferred.value() );
+			}
+		} else {
+			auto topPad = current.get_or_default<float>("border:top") + current.get_or_default<float>("padding::top");
+			auto leftPad = current.get_or_default<float>("border::left") + current.get_or_default<float>("padding::left");
+
+			math::vec2 size = {topPad, leftPad};
+
+			// layout all children
+			for ( auto& child : current ) {
+				layout(child);
+
+				auto childSize = child.get_or_default<math::vec2>("size");
+				size.x = std::max( childSize.x, size.x );
+				size.y += childSize.y;
+
+				child.set<math::vec2>("position", {leftPad, size.y});
+			}
+
+			// set our size based on that
+			current.set<math::vec2>("size", size );
+		}
+	}
+
+	void visit(const model::Widget& root, gfx::Paint& paint, Box offset) {
+		// get border size
+		auto border = get_box(root, "border");
+
+		// calculate box bounds
+		auto pos = get_vec2(root, "position");
+		auto size = get_vec2(root, "size");
+
+		auto bounds = getBounds(pos, size);
+		bounds.top += offset.top;
+		bounds.left += offset.left;
+
+		// deal with right hand size bounds
+		//bounds.right = std::min( size.x, offset.width() );
+		//bounds.right += offset.left;
+
+		// deal with bottom bounds
+		//bounds.bottom = std::min( size.y, offset.height() );
+		//bounds.bottom += offset.top;
+
+		auto background = bounds.trim(border);
+
+		draw_background_solid(paint, background, get_vec3_rgb(root, "colour"));
+		draw_border_patch(paint, bounds, border, get_vec3_rgb(root, "border::colour"));
+
+		auto padding = get_box(root, "padding");
+		background = background.trim(padding);
+
+		if ( root.hasAttr("text") ) {
+			auto text = root.get<std::string>("text");
+			paint.text(text, {background.left, background.top + PADDING});
+		}
+
+		for (const auto& child : root) {
+			visit(child, paint, background);
+		}
+	}
+
+} // namespace fggl::gui:;renderer
\ No newline at end of file

fggl/gui/widget.cpp

+/*
+ * This file is part of FGGL.
+ *
+ * FGGL is free software: you can redistribute it and/or modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any
+ * later version.
+ *
+ * FGGL is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License along with FGGL.
+ * If not, see <https://www.gnu.org/licenses/>.
+ */
+
+//
+// Created by webpigeon on 17/04/22.
+//
+
+#include <fggl/gui/widget.hpp>
+
+namespace fggl::gui {
+
+	void button_border(gfx::Path2D &path, glm::vec2 pos, glm::vec2 size) {
+		// outer box
+		path.colour({1.0F, 0.0F, 0.0F});
+		path.pathTo({pos.x + size.x, pos.y});
+		path.pathTo({pos.x + size.x, pos.y + size.y});
+		path.pathTo({pos.x, pos.y + size.y});
+		path.close();
+
+		// inner box
+		math::vec2 innerTop{pos.x + 5, pos.y + 5};
+		math::vec2 innerBottom{pos.x + size.x - 5, pos.y + size.y - 5};
+
+		path.colour({1.0F, 1.0F, 0.0F});
+		path.moveTo({innerTop.x, innerTop.y});
+		path.pathTo({innerBottom.x, innerTop.y});
+		path.pathTo({innerBottom.x, innerBottom.y});
+		path.pathTo({innerTop.x, innerBottom.y});
+		path.pathTo({innerTop.x, innerTop.y});
+	}
+
+	void draw_box(gfx::Path2D &path, glm::vec2 topLeft, glm::vec2 bottomRight) {
+		path.moveTo({topLeft.x, topLeft.y});
+		path.pathTo({bottomRight.x, topLeft.y});
+		path.pathTo({bottomRight.x, bottomRight.y});
+		path.pathTo({topLeft.x, bottomRight.y});
+		path.pathTo({topLeft.x, topLeft.y});
+	}
+
+	void draw_progress(gfx::Path2D &path, glm::vec2 topLeft, glm::vec2 size, float value) {
+		const auto bottomRight{topLeft + size};
+
+		// background
+		path.colour({0.5F, 0.5F, 0.5F});
+		draw_box(path, topLeft, bottomRight);
+
+		// fill
+		math::vec2 innerTop{topLeft.x + 5, topLeft.y + 5};
+		math::vec2 innerBottom{bottomRight.x - 5, bottomRight.y - 5};
+
+		// figure out how wide the bar should be
+		float barWidth = (innerBottom.x - innerTop.x) * value;
+		float trueBottom = innerBottom.x;
+		innerBottom.x = innerTop.x + barWidth;
+
+		// draw the bar
+		path.colour({0.8F, 0.0F, 0.0F});
+		draw_box(path, innerTop, innerBottom);
+
+		// part of the bar that's not filled in
+		math::vec2 emptyTop{innerBottom.x, innerTop.y};
+		math::vec2 emptyBottom{trueBottom, innerBottom.y};
+		path.colour({0.4F, 0.0F, 0.0F});
+		draw_box(path, emptyTop, emptyBottom);
+	}
+
+	void draw_slider(gfx::Path2D &path, glm::vec2 topLeft, glm::vec2 size, float value) {
+		draw_progress(path, topLeft, size, value);
+
+		// dimensions
+		const auto bottomRight{topLeft + size};
+		const math::vec2 innerTop{topLeft.x + 5, topLeft.y + 5};
+		const math::vec2 innerBottom{bottomRight.x - 5, bottomRight.y - 5};
+
+		// selector bar
+		float trackWidth = innerBottom.x - innerTop.x;
+		float selectorValue = trackWidth * value;
+		float selectorWidth = 6;
+
+		math::vec2 selectorTop{innerTop.x + selectorValue - (selectorWidth / 2), topLeft.y};
+		math::vec2 selectorBottom{selectorTop.x + selectorWidth, bottomRight.y};
+		path.colour({1.0F, 1.0F, 1.0F});
+		draw_box(path, selectorTop, selectorBottom);
+	}
+
+	void draw_button(gfx::Path2D &path, glm::vec2 pos, glm::vec2 size, bool active, bool pressed) {
+		// locations
+		math::vec2 outerTop{pos};
+		math::vec2 outerBottom{pos + size};
+		math::vec2 innerTop{pos.x + 5, pos.y + 5};
+		math::vec2 innerBottom{pos.x + size.x - 5, pos.y + size.y - 5};
+
+		math::vec3 baseColour{0.5F, 0.5F, 0.5F};
+
+		if (active) {
+			baseColour *= 1.2F;
+		}
+
+		if (pressed) {
+			baseColour *= 0.8F;
+		}
+
+		math::vec3 lightColour{baseColour * 1.2F};
+		math::vec3 darkColour{baseColour * 0.8F};
+		if (pressed) {
+			// flip light and dark for selected buttons
+			auto tmp = darkColour;
+			darkColour = lightColour;
+			lightColour = tmp;
+		}
+
+		// bottom side
+		path.colour(lightColour);
+		path.moveTo(outerTop);
+		path.pathTo(innerTop);
+		path.pathTo({innerBottom.x, innerTop.y});
+		path.pathTo({outerBottom.x, outerTop.y});
+		path.pathTo(outerTop);
+
+		// left side
+		path.colour(lightColour);
+		path.moveTo(outerTop);
+		path.pathTo(innerTop);
+		path.pathTo({innerTop.x, innerBottom.y});
+		path.pathTo({outerTop.x, outerBottom.y});
+		path.pathTo(outerTop);
+
+		// top side
+		path.colour(darkColour);
+		path.moveTo({outerTop.x, outerBottom.y});
+		path.pathTo({innerTop.x, innerBottom.y});
+		path.pathTo(innerBottom);
+		path.pathTo(outerBottom);
+		path.pathTo({outerTop.x, outerBottom.y});
+
+		// right side
+		path.colour(darkColour);
+		path.moveTo(outerBottom);
+		path.pathTo(innerBottom);
+		path.pathTo({innerBottom.x, innerTop.y});
+		path.pathTo({outerBottom.x, outerTop.y});
+		path.pathTo(outerBottom);
+
+		// inner box
+		path.colour(baseColour);
+		draw_box(path, innerTop, innerBottom);
+	}
+}
\ No newline at end of file

fggl/gui/widgets.cpp

+/*
+ * This file is part of FGGL.
+ *
+ * FGGL is free software: you can redistribute it and/or modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any
+ * later version.
+ *
+ * FGGL is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License along with FGGL.
+ * If not, see <https://www.gnu.org/licenses/>.
+ */
+
+//
+// Created by webpigeon on 17/04/22.
+//
+
+#include <fggl/gui/widget.hpp>
+#include <fggl/gui/widgets.hpp>
+
+#include <spdlog/spdlog.h>
+
+namespace fggl::gui {
+
+	Button::Button(math::vec2 pos, math::vec2 size) : Widget(pos, size), m_label(pos, size), m_active(false) {}
+
+	void Button::render(gfx::Paint &paint) {
+		gfx::Path2D path{topLeft()};
+		draw_button(path, topLeft(), size(), m_hover, m_active);
+		paint.fill(path);
+
+		m_label.render(paint);
+	}
+
+	void Button::activate() {
+		m_active = !m_active;
+		if (m_active) {
+			for (auto &callback : m_callbacks) {
+				callback();
+			}
+			m_active = false;
+		}
+	}
+
+	void Button::addCallback(Callback cb) {
+		m_callbacks.push_back(cb);
+	}
+
+	void Button::label(const std::string &value) {
+		m_label.text(value);
+	}
+
+	void Button::layout() {
+		m_label.size(topLeft(), size());
+	}
+
+	auto Button::label() const -> std::string {
+		return m_label.text();
+	}
+
+	void Label::layout() {
+		if (m_font == nullptr) {
+			return;
+		}
+
+		math::vec2 size;
+		for (const auto &letter : m_value) {
+			auto metrics = m_font->metrics(letter);
+			size.x += (metrics.advance << 6);
+			size.y = std::max(size.y, metrics.size.y);
+		}
+		m_naturalSize = size;
+		m_needsLayout = false;
+	}
+
+	Label::Label(math::vec2 pos, math::vec2 size) : Widget(pos, size) {
+
+	}
+} // namespace fggl::gui
\ No newline at end of file

fggl/input/camera_input.cpp

+/*
+ * This file is part of FGGL.
+ *
+ * FGGL is free software: you can redistribute it and/or modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any
+ * later version.
+ *
+ * FGGL is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License along with FGGL.
+ * If not, see <https://www.gnu.org/licenses/>.
+ */
+
+//
+// Created by webpigeon on 20/11/2021.
+//
+
+#include <fggl/input/input.hpp>
+
+#include <fggl/gfx/camera.hpp>
+#include <fggl/input/camera_input.hpp>
+
+namespace fggl::input {
+
+	void process_arcball(entity::EntityManager &ecs, const Input &input, entity::EntityID cam) {
+		// see https://asliceofrendering.com/camera/2019/11/30/ArcballCamera/
+		auto &camTransform = ecs.get<fggl::math::Transform>(cam);
+		auto &camComp = ecs.get<fggl::gfx::Camera>(cam);
+		const auto &mouse = input.mouse;
+
+		glm::vec4 position(camTransform.origin(), 1.0F);
+		glm::vec4 pivot(camComp.target, 1.0F);
+		glm::mat4 view = glm::lookAt(camTransform.origin(), camComp.target, camTransform.up());
+		glm::vec3 viewDir = -glm::transpose(view)[2];
+		glm::vec3 rightDir = glm::transpose(view)[0];
+
+		float deltaAngleX = (2 * M_PI);
+		float deltaAngleY = (M_PI);
+		float xAngle = (-mouse.axisDelta(fggl::input::MouseAxis::X)) * deltaAngleX;
+		float yAngle = (-mouse.axisDelta(fggl::input::MouseAxis::Y)) * deltaAngleY;
+
+		// rotate the camera around the pivot on the first axis
+		glm::mat4x4 rotationMatrixX(1.0F);
+		rotationMatrixX = glm::rotate(rotationMatrixX, xAngle, fggl::math::UP);
+		position = (rotationMatrixX * (position - pivot)) + pivot;
+
+		// rotate the camera around the pivot on the second axis
+		glm::mat4x4 rotationMatrixY(1.0F);
+		rotationMatrixY = glm::rotate(rotationMatrixY, yAngle, rightDir);
+		glm::vec3 finalPos = (rotationMatrixY * (position - pivot)) + pivot;
+
+		camTransform.origin(finalPos);
+	}
+
+	void process_scroll(entity::EntityManager &ecs,
+						const Input &input,
+						entity::EntityID cam,
+						float minZoom,
+						float maxZoom) {
+		auto &camTransform = ecs.get<fggl::math::Transform>(cam);
+		auto &camComp = ecs.get<fggl::gfx::Camera>(cam);
+
+		const glm::vec3 dir = (camTransform.origin() - camComp.target);
+		const glm::vec3 forward = glm::normalize(dir);
+
+		glm::vec3 motion(0.0F);
+		float delta = input.mouse.axis(fggl::input::MouseAxis::SCROLL_Y);
+		if ((glm::length(dir) < maxZoom && delta < 0.0F) || (glm::length(dir) > minZoom && delta > 0.0F)) {
+			motion -= (forward * delta);
+			camTransform.origin(camTransform.origin() + motion);
+		}
+	}
+
+	void process_freecam(entity::EntityManager &ecs, const Input &input, entity::EntityID cam) {
+		float rotationValue = 0.0F;
+		glm::vec3 translation(0.0F);
+
+		const auto &keyboard = input.keyboard;
+		auto &settings = ecs.get<FreeCamKeys>(cam);
+
+		// calculate rotation (user input)
+		if (keyboard.down(settings.rotate_cw)) {
+			rotationValue = ROT_SPEED;
+		} else if (keyboard.down(settings.rotate_ccw)) {
+			rotationValue = -ROT_SPEED;
+		}
+
+		// calculate movement (user input)
+		if (keyboard.down(settings.forward)) {
+			translation -= fggl::math::RIGHT;
+		}
+
+		if (keyboard.down(settings.backward)) {
+			translation += fggl::math::RIGHT;
+		}
+
+		if (keyboard.down(settings.right)) {
+			translation += fggl::math::FORWARD;
+		}
+
+		if (keyboard.down(settings.left)) {
+			translation -= fggl::math::FORWARD;
+		}
+
+		// apply rotation/movement
+		auto camTransform = ecs.get<fggl::math::Transform>(cam);
+		auto camComp = ecs.get<fggl::gfx::Camera>(cam);
+
+		glm::vec4 position(camTransform.origin(), 1.0F);
+		glm::vec4 pivot(camComp.target, 1.0F);
+
+		// apply movement
+		if (translation != glm::vec3(0.0F)) {
+			const auto rotation = (position - pivot);
+			const float angle = atan2f(rotation.x, rotation.z);
+			const auto rotationMat = glm::rotate(MAT_IDENTITY, angle, fggl::math::UP);
+
+			auto deltaMove = (rotationMat * glm::vec4(translation, 1.0F)) * PAN_SPEED;
+			deltaMove.w = 0.0F;
+
+			position += deltaMove;
+			pivot += deltaMove;
+		}
+
+		// apply rotation
+		if (rotationValue != 0.0F) {
+			glm::mat4 rotation = glm::rotate(MAT_IDENTITY, rotationValue, fggl::math::UP);
+			position = (rotation * (position - pivot)) + pivot;
+		}
+
+		camTransform.origin(position);
+		camComp.target = pivot;
+	}
+
+	void process_edgescroll(entity::EntityManager &ecs, const Input &input, entity::EntityID cam) {
+		glm::vec3 translation(0.0F);
+
+		const auto &mouse = input.mouse;
+
+		// calculate movement (user input)
+		if (mouse.axis(MouseAxis::Y) < 0.9F) {
+			translation -= fggl::math::RIGHT;
+		}
+
+		if (mouse.axis(MouseAxis::Y) > -0.9F) {
+			translation += fggl::math::RIGHT;
+		}
+
+		if (mouse.axis(MouseAxis::X) > -0.9F) {
+			translation += fggl::math::FORWARD;
+		}
+
+		if (mouse.axis(MouseAxis::X) < 0.9F) {
+			translation -= fggl::math::FORWARD;
+		}
+
+		// apply rotation/movement
+		auto &camTransform = ecs.get<fggl::math::Transform>(cam);
+		auto &camComp = ecs.get<fggl::gfx::Camera>(cam);
+
+		glm::vec4 position(camTransform.origin(), 1.0F);
+		glm::vec4 pivot(camComp.target, 1.0F);
+
+		// apply movement
+		if (translation != glm::vec3(0.0F)) {
+			const auto rotation = (position - pivot);
+			const float angle = atan2f(rotation.x, rotation.z);
+			const auto rotationMat = glm::rotate(MAT_IDENTITY, angle, fggl::math::UP);
+
+			auto deltaMove = (rotationMat * glm::vec4(translation, 1.0F)) * PAN_SPEED;
+			deltaMove.w = 0.0F;
+
+			position += deltaMove;
+			pivot += deltaMove;
+		}
+
+		// move camera
+		camTransform.origin(position);
+		camComp.target = pivot;
+	}
+}

fggl/input/input.cpp

+/*
+ * This file is part of FGGL.
+ *
+ * FGGL is free software: you can redistribute it and/or modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any
+ * later version.
+ *
+ * FGGL is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License along with FGGL.
+ * If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include <fggl/input/input.hpp>
+
+namespace fggl::input {
+
+	void Input::frame(float dt) {
+		keyboard.frame(dt);
+		mouse.frame(dt);
+		gamepads.frame(dt);
+	}
+
+} // namespace fggl::input

fggl/input/mouse.cpp

+/*
+ * This file is part of FGGL.
+ *
+ * FGGL is free software: you can redistribute it and/or modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any
+ * later version.
+ *
+ * FGGL is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License along with FGGL.
+ * If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include <fggl/input/mouse.hpp>
+
+namespace fggl::input {
+
+	void MouseState::operator=(const MouseState &rhs) {
+		for (int i = 0; i < 4; i++) {
+			axis[i] = rhs.axis[i];
+		}
+		buttons = rhs.buttons;
+	}
+
+} // namespace fggl::input

fggl/math/CMakeLists.txt

+# math
+find_package(glm CONFIG REQUIRED)
+target_link_libraries(fggl PUBLIC glm::glm)
+
+target_sources(fggl
+        PRIVATE
+        shapes.cpp
+        triangulation.cpp
+        )

fggl/math/shapes.cpp

+/*
+ * This file is part of FGGL.
+ *
+ * FGGL is free software: you can redistribute it and/or modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any
+ * later version.
+ *
+ * FGGL is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License along with FGGL.
+ * If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include "fggl/math/shapes.hpp"
+#include <vector>
+
+namespace fggl::math::phs3d {
+
+	void AABB::emtpy() {
+		min = {FLT_MAX, FLT_MAX, FLT_MAX};
+		max = {-FLT_MAX, -FLT_MAX, -FLT_MAX};
+	}
+
+	void AABB::add(const math::vec3 &point) {
+		min = minElm(min, point);
+		max = maxElm(max, point);
+	}
+
+	auto AABB::fromPoints(const std::vector<math::vec3> &points) -> AABB {
+		AABB box;
+		for (const auto &point : points) {
+			box.add(point);
+		}
+		return box;
+	}
+
+	void AABB::set(const AABB &other, const math::mat4 &m) {
+		// TODO this needs testing, I'm not sure if our vectors are oriented the same as 9.4.4
+		min = max = m[3]; // should be the translation component of the matrix
+
+		// this feels like something that should be vectorizable...
+		for (int i = 0; i < 3; i++) {
+			for (int j = 0; j < 3; j++) {
+				if (m[i][j] > 0.0F) {
+					min[j] += m[i][j] * other.min[j];
+					max[j] += m[i][j] * other.max[j];
+				} else {
+					min[j] += m[i][j] * other.max[j];
+					max[j] += m[i][j] * other.min[j];
+				}
+			}
+		}
+	}
+
+	auto Plane::fromPoints(const math::vec3 p1, const math::vec3 p2, const math::vec3 p3) -> Plane {
+		const auto e3 = p2 - p1;
+		const auto e1 = p3 - p2;
+		auto normal = glm::normalize(glm::cross(e3, e1));
+		auto d = glm::dot(p2, normal);
+		return {normal, d};
+	}
+
+	static auto bestFitNormal(const std::vector<math::vec3> &points) -> math::vec3 {
+		assert(!points.empty());
+
+		math::vec3 result;
+
+		math::vec3 p = points.back();
+		for (std::size_t i = 0; i < points.size(); ++i) {
+			math::vec3 c = points[i];
+
+			result.x += (p.z + c.z) * (p.y - c.y);
+			result.y += (p.x + c.x) * (p.z - c.z);
+			result.z += (p.y + c.y) - (p.x - c.x);
+
+			p = c;
+		}
+
+		return glm::normalize(result);
+	};
+
+	static auto bestFitD(const std::vector<math::vec3> &points, glm::vec3 normal) -> float {
+		math::vec3 sum;
+		for (const auto &point : points) {
+			sum += point;
+		}
+		sum *= 1.0F / points.size();
+		return glm::dot(sum, normal);
+	}
+
+	const char X = 0;
+	const char Y = 1;
+	const char Z = 2;
+
+	struct bary_axis {
+		const char a;
+		const char b;
+	};
+
+	static auto baryCalcAxis(const math::vec3 &normal) -> bary_axis {
+		if ((fabs(normal.x) >= fabs(normal.y)) && (fabs(normal.x) >= fabs(normal.z))) {
+			// discard x
+			return {Y, Z};
+		} else if (fabs(normal.y) >= fabs(normal.z)) {
+			// discard y
+			return {Z, X};
+		} else {
+			// discard z
+			return {X, Y};
+		}
+	}
+
+	auto Triangle::CartToBarycentric(const math::vec3 &cart, Barycentric &outVal) -> bool {
+		// everything is const because I'm paying the compiler is smarter than me...
+
+		const auto d1 = v[1] - v[0];
+		const auto d2 = v[2] - v[1];
+		const auto n = glm::cross(d1, d2);
+
+		// 0 = x, 1 = y, 2 = z
+		const auto ax = baryCalcAxis(n);
+
+		// first axis
+		const float u1 = v[0][ax.a] - v[2][ax.a];
+		const float u2 = v[1][ax.a] - v[2][ax.a];
+		const float u3 = cart[ax.a] - v[0][ax.a];
+		const float u4 = cart[ax.a] - v[2][ax.a];
+
+		// second axis
+		const float v1 = v[0][ax.b] - v[2][ax.b];
+		const float v2 = v[1][ax.b] - v[2][ax.b];
+		const float v3 = cart[ax.b] - v[0][ax.b];
+		const float v4 = cart[ax.b] - v[2][ax.b];
+
+		const float denom = v1 * u2 - v2 * u1;
+		if (denom == 0.0F) {
+			return false;
+		}
+
+		// finally, we can work it out
+		const float oneOverDenom = 1.0F / denom;
+		outVal.b[0] = (v4 * u2 - v2 * u4) * oneOverDenom;
+		outVal.b[1] = (v1 * u3 - v3 * u1) * oneOverDenom;
+		outVal.b[2] = 1.0F - outVal.b[0] - outVal.b[1];
+		return true;
+	}
+
+	auto Triangle::CartToBarycentric2(const math::vec3 &cart, Barycentric &outVal) -> bool {
+		const auto e1 = v[2] - v[1];
+		const auto e2 = v[0] - v[2];
+		const auto e3 = v[1] - v[0];
+
+		const auto d1 = cart - v[0];
+		const auto d2 = cart - v[1];
+		const auto d3 = cart - v[2];
+
+		const auto normal = glm::normalize(glm::cross(e1, e2));
+		const auto denom = glm::dot(glm::cross(e1, e2), normal);
+		assert(denom != 0.0F);
+
+		outVal.b[0] = glm::dot(glm::cross(e1, d3), normal) / denom;
+		outVal.b[1] = glm::dot(glm::cross(e2, d1), normal) / denom;
+		outVal.b[2] = glm::dot(glm::cross(e3, d2), normal) / denom;
+		return true;
+	}
+
+} // namespace fggl::math::phys3d
\ No newline at end of file

fggl/math/triangulation.cpp

+/*
+ * This file is part of FGGL.
+ *
+ * FGGL is free software: you can redistribute it and/or modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any
+ * later version.
+ *
+ * FGGL is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License along with FGGL.
+ * If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include "fggl/math/triangulation.hpp"
+
+namespace fggl::math {
+
+	/**
+	 * Fast Triangulation for convex polygons.
+	 */
+	void fan_triangulation(const PolygonVertex &polygon, data::Mesh2D &mesh) {
+		assert(polygon.size() >= 3);
+
+		// add the first two points to the mesh
+		auto firstIdx = mesh.add_vertex(polygon[0]);
+		auto prevIdx = mesh.add_vertex(polygon[1]);
+
+		// deal with the indices
+		const auto nTris = polygon.size() - 2;
+		for (auto i = 0U; i < nTris; i++) {
+			mesh.add_index(firstIdx);
+			mesh.add_index(prevIdx);
+
+			auto currIdx = mesh.add_vertex(polygon[i + 2]);
+			mesh.add_index(currIdx);
+			prevIdx = currIdx;
+		}
+	}
+
+} // namespace fggl::math
+