add layers and glad

quark/CMakeLists.txt

@@ -3,6 +3,8 @@ project(quark CXX)
 FetchContent_MakeAvailable(spdlog)
 FetchContent_MakeAvailable(glfw3)
 
+add_subdirectory(glad)
+
 add_library(quark SHARED)
 
 target_sources(quark
@@ -10,6 +12,7 @@ target_sources(quark
 	src/quark/Entrypoint.cpp
 	src/quark/Application.cpp
 	src/quark/Logger.cpp
+	src/quark/LayerStack.cpp
 
 	src/platform/linux/LinuxWindow.cpp
 
@@ -21,6 +24,8 @@ target_sources(quark
 	src/quark/Application.hpp
 	src/quark/Logger.hpp
 	src/quark/Window.hpp
+	src/quark/Layer.hpp
+	src/quark/LayerStack.hpp
 
 	src/quark/events/Event.hpp
 	src/quark/events/ApplicationEvent.hpp
@@ -39,6 +44,7 @@ target_precompile_headers(quark
 
 target_link_libraries(quark
 	spdlog::spdlog
+	glad
 	glfw
 )
 

quark/src/platform/linux/LinuxWindow.cpp

@@ -1,11 +1,19 @@
 #include "LinuxWindow.hpp"
 #include "quark/Core.hpp"
-#include "quark.hpp"
+#include "quark/Logger.hpp"
+#include "quark/events/ApplicationEvent.hpp"
+#include "quark/events/KeyEvent.hpp"
+#include "quark/events/MouseEvent.hpp"
+
 #include <GLFW/glfw3.h>
 
 namespace qk {
 	static bool GLFWInitialized = false;
 
+	static void GLFWErrorCallback(int error, const char* description) {
+		QK_CORE_ERROR("GLFW Error ({0}): '{1}'", error, description);
+	}
+
 	std::unique_ptr<Window> Window::Create(const WindowConfig& config) {
 		return std::make_unique<LinuxWindow>(config);
 	}
@@ -29,6 +37,8 @@ namespace qk {
 			int success = glfwInit();
 			QK_CORE_ASSERT(success, "Could not initialize GLFW");
 
+			glfwSetErrorCallback(GLFWErrorCallback);
+
 			GLFWInitialized = true;
 		}
 		
@@ -38,6 +48,7 @@ namespace qk {
 		glfwMakeContextCurrent(window);
 		glfwSetWindowUserPointer(window, &data);
 
+		InstallGLFWCallbacks();
 
 		SetVSync(true);
 	}
@@ -47,6 +58,76 @@ namespace qk {
 		window = nullptr;
 	}
 
+	void LinuxWindow::InstallGLFWCallbacks() {
+		glfwSetWindowSizeCallback(window, [](GLFWwindow* window, int width, int height) {
+			WindowData* data = reinterpret_cast<WindowData*>(glfwGetWindowUserPointer(window));
+
+			data->width = width;
+			data->height = height;
+
+			WindowResizeEvent event(width, height);
+			data->eventCallback(event);
+		});
+
+		glfwSetWindowCloseCallback(window, [] (GLFWwindow* window) {
+			WindowData* data = reinterpret_cast<WindowData*>(glfwGetWindowUserPointer(window));
+
+			WindowCloseEvent event;
+			data->eventCallback(event);
+		});
+
+		glfwSetKeyCallback(window, [] (GLFWwindow* window, int key, int scancode, int action, int modes) {
+			WindowData* data = reinterpret_cast<WindowData*>(glfwGetWindowUserPointer(window));
+
+			switch (action) {
+				case GLFW_PRESS: {
+					KeyPressedEvent event(key, 0);
+					data->eventCallback(event);
+				} break;
+
+				case GLFW_RELEASE: {
+					KeyReleasedEvent event(key);
+					data->eventCallback(event);
+				} break;
+
+				case GLFW_REPEAT: {
+					KeyPressedEvent event(key, 1);
+					data->eventCallback(event);
+				} break;
+			}
+		});
+
+		glfwSetMouseButtonCallback(window, [] (GLFWwindow* window, int button, int action, int modes) {
+			WindowData* data = reinterpret_cast<WindowData*>(glfwGetWindowUserPointer(window));
+
+			switch (action) {
+				case GLFW_PRESS: {
+					MouseButtonPressedEvent event(button);
+					data->eventCallback(event);
+				} break;
+
+				case GLFW_RELEASE: {
+					MouseButtonReleasedEvent event(button);
+					data->eventCallback(event);
+				} break;
+			}
+		});
+
+		glfwSetCursorPosCallback(window, [] (GLFWwindow* window, double x, double y) {
+			WindowData* data = reinterpret_cast<WindowData*>(glfwGetWindowUserPointer(window));
+
+			MouseMovedEvent event((float)x, (float)y);
+			data->eventCallback(event);
+		});
+
+		glfwSetScrollCallback(window, [] (GLFWwindow* window, double x, double y) {
+			WindowData* data = reinterpret_cast<WindowData*>(glfwGetWindowUserPointer(window));
+
+			MouseScrolledEvent event((float)x, (float)y);
+			data->eventCallback(event);
+		});
+	}
+
 	void LinuxWindow::OnUpdate() {
 		glfwPollEvents();
 		glfwSwapBuffers(window);

quark/src/platform/linux/LinuxWindow.hpp

@@ -25,6 +25,8 @@ namespace qk {
 		virtual void Init(const WindowConfig& config);
 		virtual void Destroy();
 
+		void InstallGLFWCallbacks();
+
 	private:
 		GLFWwindow* window;
 

quark/src/quark.hpp

@@ -1,9 +1,14 @@
 #pragma once
 
 // IWYU pragma: begin_exports
+
 #include "qkpch.hpp"
 #include "quark/Application.hpp"
-
 #include "quark/Logger.hpp"
 
+#include "quark/events/Event.hpp"
+#include "quark/events/MouseEvent.hpp"
+#include "quark/events/KeyEvent.hpp"
+#include "quark/events/ApplicationEvent.hpp"
+
 // IWYU pragma: end_exports

quark/src/quark/Application.cpp

@@ -1,16 +1,48 @@
 #include "Application.hpp"
+#include "quark.hpp"
 #include <spdlog/spdlog.h>
 
 namespace qk {
 
 	Application::Application() {
 		window = Window::Create();
+		window->SetEventCallback(std::bind(&Application::OnEvent, this, std::placeholders::_1));
 	}
 
-	void Application::Run() const {
+	void Application::Run() {
 		while(isRunning) {
+			for (Layer* layer : layers) {
+				layer->OnUpdate();
+			}
+
 			window->OnUpdate();
 		}
 	}
 
+	void Application::OnEvent(Event& e) {
+		QK_CORE_TRACE(e);
+
+		EventDispatcher dispatcher(e);
+		dispatcher.Dispatch<WindowCloseEvent>(std::bind(&Application::OnWindowClose, this, std::placeholders::_1));
+
+		for (auto it = layers.rbegin(); it != layers.rend(); it++) {
+			(*it)->OnEvent(e);
+			if (e.isHandled) {
+				break;
+			}
+		}
+	}
+
+	void Application::PushLayer(Layer* layer) {
+		layers.PushLayer(layer);
+	}
+
+	void Application::PushOverlay(Layer* layer) {
+		layers.PushOverlay(layer);
+	}
+
+	bool Application::OnWindowClose(WindowCloseEvent& e) {
+		isRunning = false;
+		return true;
+	}
 }

quark/src/quark/Application.hpp

@@ -2,6 +2,9 @@
 // IWYU pragma: private, include <quark.hpp>
 
 #include "Window.hpp"
+#include "quark/Layer.hpp"
+#include "quark/LayerStack.hpp"
+#include "quark/events/ApplicationEvent.hpp"
 
 namespace qk {
 
@@ -10,11 +13,21 @@ namespace qk {
 		Application();
 		virtual ~Application() {}
 
-		void Run() const;
+		void Run();
+
+		void OnEvent(Event& e);
+
+		void PushLayer(Layer* layer);
+		void PushOverlay(Layer* layer);
+
+	private:
+		bool OnWindowClose(WindowCloseEvent& e);
 
 	private:
 		std::unique_ptr<Window> window;
 		bool isRunning = true;
+
+		LayerStack layers;
 	};
 
 	std::unique_ptr<qk::Application> CreateApplication();

quark/src/quark/Layer.hpp

@@ -0,0 +1,26 @@
+#pragma once
+
+// IWYU pragma: private, include <quark.hpp>
+
+#include "quark/events/Event.hpp"
+
+namespace qk {
+	class Layer {
+	public:
+		Layer(const std::string& name = "Layer") :
+			debugName(name)
+		{ }
+
+		virtual ~Layer() {}
+
+		virtual void OnAttach() {}
+		virtual void OnDetach() {}
+		virtual void OnUpdate() {}
+		virtual void OnEvent(Event& event) {}
+
+		inline const std::string& GetName() const { return debugName; }
+
+	protected:
+		std::string debugName;
+	};
+}

quark/src/quark/LayerStack.cpp

@@ -0,0 +1,36 @@
+#include "LayerStack.hpp"
+
+namespace qk {
+	LayerStack::LayerStack() {
+		layerInsert = layers.begin();
+	}
+
+	LayerStack::~LayerStack() {
+		for (Layer* layer : layers) {
+			delete layer;
+		}
+	}
+
+	void LayerStack::PushLayer(Layer* layer) {
+		layerInsert = layers.emplace(layerInsert, layer);
+	}
+
+	void LayerStack::PushOverlay(Layer* layer) {
+		layers.emplace_back(layer);
+	}
+
+	void LayerStack::PopLayer(Layer* layer) {
+		auto it = std::find(layers.begin(), layerInsert, layer);
+		if (it != layerInsert) {
+			layers.erase(it);
+			layerInsert--;
+		}
+	}
+
+	void LayerStack::PopOverlay(Layer* layer) {
+		auto it = std::find(layerInsert, layers.end(), layer);
+		if (it != layers.end()) {
+			layers.erase(it);
+		}
+	}
+}

quark/src/quark/LayerStack.hpp

@@ -0,0 +1,33 @@
+#pragma once
+
+// IWYU pragma: private, include <quark.hpp>
+//
+#include "quark/Layer.hpp"
+#include <list>
+
+namespace qk {
+	class LayerStack {
+	public:
+		using Container = std::list<Layer*>;
+
+	public:
+		LayerStack();
+		~LayerStack();
+
+		void PushLayer(Layer* layer);
+		void PushOverlay(Layer* overlay);
+
+		void PopLayer(Layer* layer);
+		void PopOverlay(Layer* layer);
+
+		Container::iterator begin() { return layers.begin(); }
+		Container::iterator end() { return layers.end(); }
+
+		Container::reverse_iterator rbegin() { return layers.rbegin(); }
+		Container::reverse_iterator rend() { return layers.rend(); }
+
+	private:
+		Container layers;
+		Container::iterator layerInsert;
+	};
+}

quark/src/quark/Window.hpp

@@ -1,6 +1,7 @@
 #pragma once
 
 #include "quark/events/Event.hpp"
+
 namespace qk {
 	struct WindowConfig {
 		std::string title;

quark/src/quark/events/ApplicationEvent.hpp

@@ -1,5 +1,5 @@
 #pragma once
-// IWYU pragma: private <quark.h>
+// IWYU pragma: private, include <quark.hpp>
 
 #include "Event.hpp"
 

quark/src/quark/events/Event.hpp

@@ -1,5 +1,5 @@
 #pragma once 
-// IWYU pragma: private <quark.h>
+// IWYU pragma: private, include <quark.hpp>
 
 #include <fmt/base.h>
 #include <fmt/ostream.h>
@@ -58,16 +58,16 @@ namespace qk {
 			return (GetCategoryFlags() & category) != 0;
 		}
 
-	protected:
+	public:
-		bool handled = false;
+		bool isHandled = false;
 	};
 
 	class EventDispatcher {
 		template <typename T>
 		using EventFn = std::function<bool(T&)>;
 
-	public:
+              public:
-		EventDispatcher(Event& event) :
+                EventDispatcher(Event& event) :
 			event(event)
 		{ }
 
@@ -75,7 +75,7 @@ namespace qk {
 		requires std::is_base_of_v<Event, T>
 		bool Dispatch(EventFn<T> func) {
 			if (event.GetEventType() == T::GetStaticType()) {
-				event.handled = func(*(T*)&event);
+				event.isHandled = func(*(T*)&event);
 				return true;
 			}
 

quark/src/quark/events/KeyEvent.hpp

@@ -1,5 +1,5 @@
 #pragma once
-// IWYU pragma: private <quark.h>
+// IWYU pragma: private, include <quark.hpp>
 
 #include "Event.hpp"
 
@@ -29,6 +29,12 @@ namespace qk {
 			KeyEvent(keyCode), repeatCount(repeatCount)
 		{ }
 
+		virtual operator std::string() const override {
+			std::stringstream ss;
+			ss << "KeyPressedEvent: " << keyCode << " (x" << repeatCount << ")";
+			return ss.str();
+		}
+
 		inline int GetRepeatCount() const { return repeatCount; }
 
 		EVENT_CLASS_TYPE(KeyPressed)
@@ -44,6 +50,12 @@ namespace qk {
 			KeyEvent(keyCode)
 		{ }
 
+		virtual operator std::string() const override {
+			std::stringstream ss;
+			ss << "KeyReleasedEvent: " << keyCode;
+			return ss.str();
+		}
+
 		EVENT_CLASS_TYPE(KeyReleased)
 	};
 }

quark/src/quark/events/MouseEvent.hpp

@@ -1,5 +1,5 @@
 #pragma once
-// IWYU pragma: private <quark.h>
+// IWYU pragma: private, include <quark.hpp>
 
 #include "Event.hpp"
 

quark/vendor/glad/CMakeLists.txt

@@ -0,0 +1,7 @@
+add_library(glad
+	src/gl.c
+)
+
+target_include_directories(glad
+	PUBLIC include
+)

quark/vendor/glad/include/KHR/khrplatform.h

@@ -0,0 +1,311 @@
+#ifndef __khrplatform_h_
+#define __khrplatform_h_
+
+/*
+** Copyright (c) 2008-2018 The Khronos Group Inc.
+**
+** Permission is hereby granted, free of charge, to any person obtaining a
+** copy of this software and/or associated documentation files (the
+** "Materials"), to deal in the Materials without restriction, including
+** without limitation the rights to use, copy, modify, merge, publish,
+** distribute, sublicense, and/or sell copies of the Materials, and to
+** permit persons to whom the Materials are 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 Materials.
+**
+** THE MATERIALS ARE 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
+** MATERIALS OR THE USE OR OTHER DEALINGS IN THE MATERIALS.
+*/
+
+/* Khronos platform-specific types and definitions.
+ *
+ * The master copy of khrplatform.h is maintained in the Khronos EGL
+ * Registry repository at https://github.com/KhronosGroup/EGL-Registry
+ * The last semantic modification to khrplatform.h was at commit ID:
+ *      67a3e0864c2d75ea5287b9f3d2eb74a745936692
+ *
+ * Adopters may modify this file to suit their platform. Adopters are
+ * encouraged to submit platform specific modifications to the Khronos
+ * group so that they can be included in future versions of this file.
+ * Please submit changes by filing pull requests or issues on
+ * the EGL Registry repository linked above.
+ *
+ *
+ * See the Implementer's Guidelines for information about where this file
+ * should be located on your system and for more details of its use:
+ *    http://www.khronos.org/registry/implementers_guide.pdf
+ *
+ * This file should be included as
+ *        #include <KHR/khrplatform.h>
+ * by Khronos client API header files that use its types and defines.
+ *
+ * The types in khrplatform.h should only be used to define API-specific types.
+ *
+ * Types defined in khrplatform.h:
+ *    khronos_int8_t              signed   8  bit
+ *    khronos_uint8_t             unsigned 8  bit
+ *    khronos_int16_t             signed   16 bit
+ *    khronos_uint16_t            unsigned 16 bit
+ *    khronos_int32_t             signed   32 bit
+ *    khronos_uint32_t            unsigned 32 bit
+ *    khronos_int64_t             signed   64 bit
+ *    khronos_uint64_t            unsigned 64 bit
+ *    khronos_intptr_t            signed   same number of bits as a pointer
+ *    khronos_uintptr_t           unsigned same number of bits as a pointer
+ *    khronos_ssize_t             signed   size
+ *    khronos_usize_t             unsigned size
+ *    khronos_float_t             signed   32 bit floating point
+ *    khronos_time_ns_t           unsigned 64 bit time in nanoseconds
+ *    khronos_utime_nanoseconds_t unsigned time interval or absolute time in
+ *                                         nanoseconds
+ *    khronos_stime_nanoseconds_t signed time interval in nanoseconds
+ *    khronos_boolean_enum_t      enumerated boolean type. This should
+ *      only be used as a base type when a client API's boolean type is
+ *      an enum. Client APIs which use an integer or other type for
+ *      booleans cannot use this as the base type for their boolean.
+ *
+ * Tokens defined in khrplatform.h:
+ *
+ *    KHRONOS_FALSE, KHRONOS_TRUE Enumerated boolean false/true values.
+ *
+ *    KHRONOS_SUPPORT_INT64 is 1 if 64 bit integers are supported; otherwise 0.
+ *    KHRONOS_SUPPORT_FLOAT is 1 if floats are supported; otherwise 0.
+ *
+ * Calling convention macros defined in this file:
+ *    KHRONOS_APICALL
+ *    KHRONOS_APIENTRY
+ *    KHRONOS_APIATTRIBUTES
+ *
+ * These may be used in function prototypes as:
+ *
+ *      KHRONOS_APICALL void KHRONOS_APIENTRY funcname(
+ *                                  int arg1,
+ *                                  int arg2) KHRONOS_APIATTRIBUTES;
+ */
+
+#if defined(__SCITECH_SNAP__) && !defined(KHRONOS_STATIC)
+#   define KHRONOS_STATIC 1
+#endif
+
+/*-------------------------------------------------------------------------
+ * Definition of KHRONOS_APICALL
+ *-------------------------------------------------------------------------
+ * This precedes the return type of the function in the function prototype.
+ */
+#if defined(KHRONOS_STATIC)
+    /* If the preprocessor constant KHRONOS_STATIC is defined, make the
+     * header compatible with static linking. */
+#   define KHRONOS_APICALL
+#elif defined(_WIN32)
+#   define KHRONOS_APICALL __declspec(dllimport)
+#elif defined (__SYMBIAN32__)
+#   define KHRONOS_APICALL IMPORT_C
+#elif defined(__ANDROID__)
+#   define KHRONOS_APICALL __attribute__((visibility("default")))
+#else
+#   define KHRONOS_APICALL
+#endif
+
+/*-------------------------------------------------------------------------
+ * Definition of KHRONOS_APIENTRY
+ *-------------------------------------------------------------------------
+ * This follows the return type of the function  and precedes the function
+ * name in the function prototype.
+ */
+#if defined(_WIN32) && !defined(_WIN32_WCE) && !defined(__SCITECH_SNAP__)
+    /* Win32 but not WinCE */
+#   define KHRONOS_APIENTRY __stdcall
+#else
+#   define KHRONOS_APIENTRY
+#endif
+
+/*-------------------------------------------------------------------------
+ * Definition of KHRONOS_APIATTRIBUTES
+ *-------------------------------------------------------------------------
+ * This follows the closing parenthesis of the function prototype arguments.
+ */
+#if defined (__ARMCC_2__)
+#define KHRONOS_APIATTRIBUTES __softfp
+#else
+#define KHRONOS_APIATTRIBUTES
+#endif
+
+/*-------------------------------------------------------------------------
+ * basic type definitions
+ *-----------------------------------------------------------------------*/
+#if (defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901L) || defined(__GNUC__) || defined(__SCO__) || defined(__USLC__)
+
+
+/*
+ * Using <stdint.h>
+ */
+#include <stdint.h>
+typedef int32_t                 khronos_int32_t;
+typedef uint32_t                khronos_uint32_t;
+typedef int64_t                 khronos_int64_t;
+typedef uint64_t                khronos_uint64_t;
+#define KHRONOS_SUPPORT_INT64   1
+#define KHRONOS_SUPPORT_FLOAT   1
+/*
+ * To support platform where unsigned long cannot be used interchangeably with
+ * inptr_t (e.g. CHERI-extended ISAs), we can use the stdint.h intptr_t.
+ * Ideally, we could just use (u)intptr_t everywhere, but this could result in
+ * ABI breakage if khronos_uintptr_t is changed from unsigned long to
+ * unsigned long long or similar (this results in different C++ name mangling).
+ * To avoid changes for existing platforms, we restrict usage of intptr_t to
+ * platforms where the size of a pointer is larger than the size of long.
+ */
+#if defined(__SIZEOF_LONG__) && defined(__SIZEOF_POINTER__)
+#if __SIZEOF_POINTER__ > __SIZEOF_LONG__
+#define KHRONOS_USE_INTPTR_T
+#endif
+#endif
+
+#elif defined(__VMS ) || defined(__sgi)
+
+/*
+ * Using <inttypes.h>
+ */
+#include <inttypes.h>
+typedef int32_t                 khronos_int32_t;
+typedef uint32_t                khronos_uint32_t;
+typedef int64_t                 khronos_int64_t;
+typedef uint64_t                khronos_uint64_t;
+#define KHRONOS_SUPPORT_INT64   1
+#define KHRONOS_SUPPORT_FLOAT   1
+
+#elif defined(_WIN32) && !defined(__SCITECH_SNAP__)
+
+/*
+ * Win32
+ */
+typedef __int32                 khronos_int32_t;
+typedef unsigned __int32        khronos_uint32_t;
+typedef __int64                 khronos_int64_t;
+typedef unsigned __int64        khronos_uint64_t;
+#define KHRONOS_SUPPORT_INT64   1
+#define KHRONOS_SUPPORT_FLOAT   1
+
+#elif defined(__sun__) || defined(__digital__)
+
+/*
+ * Sun or Digital
+ */
+typedef int                     khronos_int32_t;
+typedef unsigned int            khronos_uint32_t;
+#if defined(__arch64__) || defined(_LP64)
+typedef long int                khronos_int64_t;
+typedef unsigned long int       khronos_uint64_t;
+#else
+typedef long long int           khronos_int64_t;
+typedef unsigned long long int  khronos_uint64_t;
+#endif /* __arch64__ */
+#define KHRONOS_SUPPORT_INT64   1
+#define KHRONOS_SUPPORT_FLOAT   1
+
+#elif 0
+
+/*
+ * Hypothetical platform with no float or int64 support
+ */
+typedef int                     khronos_int32_t;
+typedef unsigned int            khronos_uint32_t;
+#define KHRONOS_SUPPORT_INT64   0
+#define KHRONOS_SUPPORT_FLOAT   0
+
+#else
+
+/*
+ * Generic fallback
+ */
+#include <stdint.h>
+typedef int32_t                 khronos_int32_t;
+typedef uint32_t                khronos_uint32_t;
+typedef int64_t                 khronos_int64_t;
+typedef uint64_t                khronos_uint64_t;
+#define KHRONOS_SUPPORT_INT64   1
+#define KHRONOS_SUPPORT_FLOAT   1
+
+#endif
+
+
+/*
+ * Types that are (so far) the same on all platforms
+ */
+typedef signed   char          khronos_int8_t;
+typedef unsigned char          khronos_uint8_t;
+typedef signed   short int     khronos_int16_t;
+typedef unsigned short int     khronos_uint16_t;
+
+/*
+ * Types that differ between LLP64 and LP64 architectures - in LLP64,
+ * pointers are 64 bits, but 'long' is still 32 bits. Win64 appears
+ * to be the only LLP64 architecture in current use.
+ */
+#ifdef KHRONOS_USE_INTPTR_T
+typedef intptr_t               khronos_intptr_t;
+typedef uintptr_t              khronos_uintptr_t;
+#elif defined(_WIN64)
+typedef signed   long long int khronos_intptr_t;
+typedef unsigned long long int khronos_uintptr_t;
+#else
+typedef signed   long  int     khronos_intptr_t;
+typedef unsigned long  int     khronos_uintptr_t;
+#endif
+
+#if defined(_WIN64)
+typedef signed   long long int khronos_ssize_t;
+typedef unsigned long long int khronos_usize_t;
+#else
+typedef signed   long  int     khronos_ssize_t;
+typedef unsigned long  int     khronos_usize_t;
+#endif
+
+#if KHRONOS_SUPPORT_FLOAT
+/*
+ * Float type
+ */
+typedef          float         khronos_float_t;
+#endif
+
+#if KHRONOS_SUPPORT_INT64
+/* Time types
+ *
+ * These types can be used to represent a time interval in nanoseconds or
+ * an absolute Unadjusted System Time.  Unadjusted System Time is the number
+ * of nanoseconds since some arbitrary system event (e.g. since the last
+ * time the system booted).  The Unadjusted System Time is an unsigned
+ * 64 bit value that wraps back to 0 every 584 years.  Time intervals
+ * may be either signed or unsigned.
+ */
+typedef khronos_uint64_t       khronos_utime_nanoseconds_t;
+typedef khronos_int64_t        khronos_stime_nanoseconds_t;
+#endif
+
+/*
+ * Dummy value used to pad enum types to 32 bits.
+ */
+#ifndef KHRONOS_MAX_ENUM
+#define KHRONOS_MAX_ENUM 0x7FFFFFFF
+#endif
+
+/*
+ * Enumerated boolean type
+ *
+ * Values other than zero should be considered to be true.  Therefore
+ * comparisons should not be made against KHRONOS_TRUE.
+ */
+typedef enum {
+    KHRONOS_FALSE = 0,
+    KHRONOS_TRUE  = 1,
+    KHRONOS_BOOLEAN_ENUM_FORCE_SIZE = KHRONOS_MAX_ENUM
+} khronos_boolean_enum_t;
+
+#endif /* __khrplatform_h_ */

sandbox/src/Application.cpp

@@ -1,11 +1,30 @@
 #include <memory>
 #include <quark.hpp>
 
+class ExampleLayer :
+	public qk::Layer
+{
+public:
+	ExampleLayer() :
+		Layer("Example")
+	{ }
+
+	void OnUpdate() override {
+		QK_TRACE("ExampleLayer::Update");
+	}
+
+	void OnEvent(qk::Event& event) override {
+		QK_TRACE(event);
+	}
+};
+
 class Sandbox :
 	public qk::Application
 {
 public:
-	
+	Sandbox() {
+		PushLayer(new ExampleLayer);
+	}
 };
 
 std::unique_ptr<qk::Application> qk::CreateApplication() {