Initial commit

.gitignore

@@ -0,0 +1 @@
+build/

.gitmodules

@@ -0,0 +1,12 @@
+[submodule "deps/freetype"]
+	path = deps/freetype
+	url = https://github.com/aseprite/freetype2
+[submodule "deps/glfw"]
+	path = deps/glfw
+	url = https://github.com/glfw/glfw
+[submodule "deps/glm"]
+	path = deps/glm
+	url = https://github.com/g-truc/glm
+[submodule "deps/stb"]
+	path = deps/stb
+	url = https://github.com/nothings/stb

CMakeLists.txt

@@ -0,0 +1,63 @@
+# User config between these lines
+# ------------------------------------------
+
+# Set project name
+set(NAME "final")
+
+# ------------------------------------------
+
+cmake_minimum_required(VERSION 3.1)
+
+# Check if the build should include debugging symbols
+option(DEBUG "" ON)
+if(NOT DEBUG)
+	# cmake -DDEBUG=off .. && make
+	message("--- Release ---")
+	set(CMAKE_BUILD_TYPE "Release")
+
+	# -O3     = Optimizations that increase compilation time and performance
+	set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} -O3")
+else()
+	# cmake -DDEBUG=on .. && make
+	message("--- Debug ---")
+	set(CMAKE_BUILD_TYPE "Debug")
+
+	# -Og     = Optimizations that do not interfere with debugging
+	# -Wall   = All warnings about contructions that are easily avoidable
+	# -Wextra = Extra warning flags not covered by -Wall
+	# -pg     = Generate profile information for analysis with gprof
+	set(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} -Og -Wall -Wextra -pg")
+	# gprof final gmon.out > profile-data.txt
+endif()
+
+project(${NAME})
+set(CMAKE_CXX_STANDARD 14)
+
+# Include all headers
+include_directories(
+	"deps/glfw/include"
+	"deps/glad/include"
+	"deps/glm"
+	"deps/stb"
+	"deps/freetype/include"
+	"include"
+)
+
+# Add source files
+file(GLOB_RECURSE GLAD "deps/glad/*.c")
+file(GLOB_RECURSE SOURCE "src/*.cpp")
+set(SOURCES ${GLAD} ${SOURCE})
+
+# GLFW
+set(GLFW_BUILD_DOCS OFF CACHE BOOL "" FORCE)
+set(GLFW_BUILD_TESTS OFF CACHE BOOL "" FORCE)
+set(GLFW_BUILD_EXAMPLES OFF CACHE BOOL "" FORCE)
+
+# Add GLFW target to project
+add_subdirectory(deps/glfw)
+
+# Add FreeType target to project
+add_subdirectory(deps/freetype)
+
+add_executable(${NAME} ${SOURCES})
+target_link_libraries(${NAME} glfw freetype)

README.org

@@ -0,0 +1,50 @@
+#+TITLE: OpenGL Test
+#+AUTHOR: Riyyi
+#+LANGUAGE: en
+#+OPTIONS: toc:nil
+
+OpenGL Test.
+
+* Download
+
+** Clone
+
+#+BEGIN_SRC shell-script
+$ git clone "https://<git>.com/riyyi/opengl-test"
+$ cd opengl-test
+$ git submodule init
+$ git submodule update
+#+END_SRC
+
+** Update
+
+#+BEGIN_SRC shell-script
+$ git pull
+$ git submodule update --recursive
+#+END_SRC
+
+* Build instructions
+
+#+BEGIN_SRC shell-script
+$ mkdir build
+$ cd build
+$ cmake .. && make
+#+END_SRC
+
+* Controls
+
+| Button     | Action         |
+|------------+----------------|
+| WASD       | Move around    |
+| Space      | Move upwards   |
+| Left Shift | Move downwards |
+| Mouse      | Look around    |
+| Escape     | Quit           |
+
+* Libraries
+
+- [[https://github.com/aseprite/freetype2][FreeType2]]
+- [[https://github.com/Dav1dde/glad][glad]]
+- [[https://github.com/glfw/glfw][GLFW]]
+- [[https://github.com/g-truc/glm][GLM]]
+- [[https://github.com/nothings/stb][stb]]

data/glsl/color.frag

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+#version 130
+out vec4 FragColor;
+
+in vec3 color;
+
+void main()
+{
+    FragColor = vec4(color, 1.0f);
+}

data/glsl/color.vert

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+#version 130
+in vec3 aPos;
+in vec3 aColor;
+
+out vec3 color;
+
+uniform mat4 model;
+uniform mat4 view;
+uniform mat4 projection;
+
+void main()
+{
+	// Vclip = Mprojection ⋅ Mview ⋅ Mmodel ⋅ Vlocal
+	gl_Position = projection * view * model * vec4(aPos, 1.0);
+    color = aColor;
+}

data/glsl/font.frag

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+#version 130
+in vec2 textCoord;
+
+out vec4 fragColor;
+
+uniform vec3 color;
+uniform sampler2D texture1;
+
+void main()
+{    
+	// Sample sets the alpha channel to either 0 / 1
+	vec4 sampled = vec4(1.0f, 1.0f, 1.0f, texture(texture1, textCoord).r);
+	fragColor = vec4(color, 1.0f) * sampled;
+}

data/glsl/font.vert

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+#version 130
+in vec4 postex; // <vec2 position, vec2 texture>
+
+out vec2 textCoord;
+
+uniform mat4 projection;
+
+void main()
+{
+    gl_Position = projection * vec4(postex.xy, 0.0f, 1.0f);
+    textCoord = postex.zw;
+}

data/glsl/simple.frag

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+#version 130
+in vec2 textCoord;
+
+out vec4 FragColor;
+
+uniform vec4 color;
+uniform sampler2D texture1;
+
+void main()
+{
+    // FragColor = color;
+	FragColor = texture(texture1, textCoord) * color;
+}

data/glsl/simple.vert

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+#version 130
+in vec3 aPos;
+in vec2 aTextCoord;
+
+out vec2 textCoord;
+
+uniform mat4 model;
+uniform mat4 view;
+uniform mat4 projection;
+
+void main()
+{
+	// Vclip = Mprojection ⋅ Mview ⋅ Mmodel ⋅ Vlocal
+	gl_Position = projection * view * model * vec4(aPos, 1.0);
+	textCoord = aTextCoord;
+}

deps/freetype

@@ -0,0 +1 @@
+Subproject commit fbbcf50367403a6316a013b51690071198962920

deps/glad/include/KHR/khrplatform.h

@@ -0,0 +1,282 @@
+#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;
+ */
+
+/*-------------------------------------------------------------------------
+ * Definition of KHRONOS_APICALL
+ *-------------------------------------------------------------------------
+ * This precedes the return type of the function in the function prototype.
+ */
+#if defined(_WIN32) && !defined(__SCITECH_SNAP__)
+#   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
+
+#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 _WIN64
+typedef signed   long long int khronos_intptr_t;
+typedef unsigned long long int khronos_uintptr_t;
+typedef signed   long long int khronos_ssize_t;
+typedef unsigned long long int khronos_usize_t;
+#else
+typedef signed   long  int     khronos_intptr_t;
+typedef unsigned long  int     khronos_uintptr_t;
+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_ */

deps/glfw

@@ -0,0 +1 @@
+Subproject commit 2c7f3ce91b4f22773855c43d6480824ed4ac9907

deps/glm

@@ -0,0 +1 @@
+Subproject commit 6347f62261da5be4e27a256e28aef6abc0ba884d

deps/stb

@@ -0,0 +1 @@
+Subproject commit b42009b3b9d4ca35bc703f5310eedc74f584be58

include/camera.h

@@ -0,0 +1,38 @@
+/*
+ * Rick van Vonderen
+ * 0945444
+ * TI2B
+ */
+
+#ifndef CAMERA_H
+#define CAMERA_H
+
+#define SPEED 2.5f
+#define SENSITIVITY 0.25f
+#define NEAR_PlANE 0.1f
+#define FAR_PlANE 100.0f
+
+#include "object.h"
+
+class Camera : public Object {
+public:
+	void initialize();
+	void update();
+	void render();
+	void destroy();
+
+// -----------------------------------------
+
+	float fov();
+	void setFov(float fov);
+	glm::mat4 projection();
+
+private:
+	float m_fov;
+	float m_pitch;
+	float m_yaw;
+	glm::vec3 m_up;
+	glm::mat4 m_projection;
+};
+
+#endif // CAMERA_H

include/cube.h

@@ -0,0 +1,42 @@
+/*
+ * Rick van Vonderen
+ * 0945444
+ * TI2B
+ */
+
+#ifndef CUBE_H
+#define CUBE_H
+
+#include <glm/glm.hpp>
+
+#include "object.h"
+
+class Shader;
+
+class Cube : public Object {
+public:
+	Cube();
+	Cube(float r, float g, float b);
+	~Cube();
+
+// -----------------------------------------
+
+	void initialize();
+	void update();
+	void render();
+	void destroy();
+
+// -----------------------------------------
+
+	void setColor(float r, float g, float b);
+
+private:
+	unsigned int m_vao;
+	unsigned int m_vbo;
+	unsigned int m_vSize;
+	unsigned int m_texture;
+	glm::vec3 m_color;
+	Shader *m_shader;
+};
+
+#endif // CUBE_H

include/cubecolor.h

@@ -0,0 +1,43 @@
+/*
+ * Rick van Vonderen
+ * 0945444
+ * TI2B
+ */
+
+#ifndef CUBE_COLOR_H
+#define CUBE_COLOR_H
+
+#include <glm/glm.hpp>
+
+#include "object.h"
+
+class Shader;
+
+class CubeColor : public Object {
+public:
+	CubeColor();
+	CubeColor(float r, float g, float b, bool lineMode = false);
+	~CubeColor();
+
+// -----------------------------------------
+
+	void initialize();
+	void update();
+	void render();
+	void destroy();
+
+// -----------------------------------------
+
+	void setLineMode(bool lineMode);
+	void setColor(float r, float g, float b);
+
+private:
+	bool m_lineMode;
+	unsigned int m_vao;
+	unsigned int m_vbo;
+	unsigned int m_vSize;
+	glm::vec3 m_color;
+	Shader *m_shader;
+};
+
+#endif // CUBE_COLOR_H

include/entity.h

@@ -0,0 +1,31 @@
+/*
+ * Rick van Vonderen
+ * 0945444
+ * TI2B
+ */
+
+#ifndef ENTITY_H
+#define ENTITY_H
+
+class Entity {
+public:
+	Entity();
+	virtual ~Entity();
+
+// -----------------------------------------
+
+	virtual void initialize() = 0;
+	virtual void update() = 0;
+	virtual void render() = 0;
+	virtual void destroy() = 0;
+
+// -----------------------------------------
+
+	bool active() const;
+	void setActive(bool active);
+
+private:
+	bool m_active;
+};
+
+#endif // ENTITY_H

include/font.h

@@ -0,0 +1,42 @@
+/*
+ * Rick van Vonderen
+ * 0945444
+ * TI2B
+ */
+
+#ifndef FONT_H
+#define FONT_H
+
+#include <map> // map
+#include <string> // string
+#include <unordered_map> // unordered_map
+
+#include <ft2build.h>
+#include FT_FREETYPE_H
+#include <glm/glm.hpp>
+
+struct Character {
+    unsigned int texture; // ID
+    glm::ivec2   size;    // Width / height
+    glm::ivec2   bearing; // Offset from baseline to left/top of glyph
+    unsigned int advance; // Offset to advance to next glyph
+};
+
+class FontManager {
+public:
+	FT_Face loadFont(const std::string &path);
+
+// -----------------------------------------
+
+	Character character(const char character) const;
+	const std::map<const char, Character> &characterList() const;
+
+private:
+	std::unordered_map<std::string, FT_Face> m_fontList;
+
+	std::map<const char, Character> m_characterList;
+};
+
+extern FontManager *g_fontManager;
+
+#endif // FONT_H

include/gamestate.h

@@ -0,0 +1,66 @@
+/*
+ * Rick van Vonderen
+ * 0945444
+ * TI2B
+ */
+
+#ifndef GAMESTATE_H
+#define GAMESTATE_H
+
+#include <chrono> // time
+#include <thread> // sleep_for
+
+#include "entity.h"
+#include "window.h"
+
+class GameState : public Entity {
+public:
+	static void sleep(int amount) {
+		// Sleep for amount ms
+		std::this_thread::sleep_for(std::chrono::milliseconds(amount));
+	}
+};
+
+class GameStateManager {
+public:
+	GameStateManager() : m_state(nullptr) {
+	}
+
+	~GameStateManager() {
+		if(m_state != nullptr) {
+			m_state->destroy();
+			delete m_state;
+		}
+	}
+
+	void setState(GameState* state) {
+		if(m_state != nullptr) {
+			m_state->destroy();
+			delete m_state;
+		}
+
+		m_state = state;
+		if(m_state != nullptr) {
+			m_state->initialize();
+		}
+	}
+
+	void update() {
+		if(m_state != nullptr) {
+			m_state->update();
+		}
+	}
+
+	void render() {
+		if(m_state != nullptr) {
+			m_state->render();
+		}
+	}
+
+private:
+	GameState *m_state;
+};
+
+extern GameStateManager *g_gameStateManager;
+
+#endif // GAMESTATE_H

include/input.h

@@ -0,0 +1,53 @@
+/*
+ * Rick van Vonderen
+ * 0945444
+ * TI2B
+ */
+
+#ifndef INPUT_H
+#define INPUT_H
+
+#include <GLFW/glfw3.h>
+
+#include "entity.h"
+
+class InputManager : public Entity {
+public:
+	InputManager();
+	~InputManager();
+
+// -----------------------------------------
+
+	void initialize();
+	void update();
+	void render();
+	void destroy();
+
+// -----------------------------------------
+
+	enum keyStates {
+		UP = 0,
+		PRESSED,
+		DOWN,
+		RELEASED,
+	};
+
+	char keyState(int key);
+	void setKeyState(int key, int scancode, int action, int mode);
+	float xOffset();
+	float yOffset();
+	void setMouse(double xpos, double ypos);
+
+private:
+	char m_previousKeyStates[GLFW_KEY_LAST];
+	char m_currentKeyStates[GLFW_KEY_LAST];
+	bool m_firstMouse;
+	float m_xLast;
+	float m_yLast;
+	float m_xOffset;
+	float m_yOffset;
+};
+
+extern InputManager *g_inputManager;
+
+#endif // INPUT_H

include/object.h

@@ -0,0 +1,46 @@
+/*
+ * Rick van Vonderen
+ * 0945444
+ * TI2B
+ */
+
+#ifndef OBJECT_H
+#define OBJECT_H
+
+#include <glm/glm.hpp>
+
+#include "entity.h"
+
+class Object : public Entity {
+public:
+	Object();
+
+// -----------------------------------------
+
+	virtual void initialize();
+	virtual void update();
+	virtual void render();
+	virtual void destroy();
+
+// -----------------------------------------
+
+	glm::vec3 position() const;
+	void setPosition(glm::vec3 position);
+	void setPosition(float x, float y, float z);
+	glm::vec3 rotation() const;
+	void setRotation(glm::vec3 rotation);
+	void setRotation(float x, float y, float z);
+	glm::vec3 scale() const;
+	void setScale(glm::vec3 scale);
+	void setScale(float x, float y, float z);
+	glm::mat4 model() const;
+	void setModel(glm::mat4 transform);
+
+private:
+	glm::vec3 m_position;
+	glm::vec3 m_rotation;
+	glm::vec3 m_scale;
+	glm::mat4 m_model;
+};
+
+#endif // OBJECT_H

include/shader.h

@@ -0,0 +1,44 @@
+/*
+ * Rick van Vonderen
+ * 0945444
+ * TI2B
+ */
+
+#ifndef SHADER_H
+#define SHADER_H
+
+#define INFO_LOG_SIZE 512
+
+#include <glm/glm.hpp>
+
+#include <string>
+
+class Shader {
+public:
+	Shader(const std::string &vertexSource, const std::string &fragmentSource);
+	~Shader();
+
+// -----------------------------------------
+
+	// Setup shader program
+	std::string readFile(const std::string &path) const;
+	unsigned int compileShader(unsigned int type, const char *shaderSource) const;
+	unsigned int linkShader(unsigned int vertex, unsigned int fragment) const;
+	int checkStatus(unsigned int check, bool isProgram = false) const;
+
+	// Use shader program
+	void use() const;
+	void setFloat(const std::string &name, float f1, float f2, float f3, float f4) const;
+	void setFloat(const std::string &name, glm::vec3 v) const;
+	void setFloat(const std::string &name, glm::vec4 v) const;
+	void setFloat(const std::string &name, glm::mat4 m) const;
+
+// -----------------------------------------
+
+	unsigned int program() const;
+
+private:
+	unsigned int m_program;
+};
+
+#endif // SHADER_H

include/state/maingame.h

@@ -0,0 +1,33 @@
+/*
+ * Rick van Vonderen
+ * 0945444
+ * TI2B
+ */
+
+#ifndef MAINGAME_H
+#define MAINGAME_H
+
+#define CUBE 6
+#define CUBE_SIZE 15
+
+#include <array>
+
+#include "gamestate.h"
+
+class Object;
+class Text;
+
+class MainGame : public GameState
+{
+public:
+    void initialize();
+    void update();
+    void render();
+    void destroy();
+
+private:
+	std::array<Object *, CUBE_SIZE> m_object;
+	Text *m_text;
+};
+
+#endif // MAINGAME_H

include/text.h

@@ -0,0 +1,42 @@
+/*
+ * Rick van Vonderen
+ * 0945444
+ * TI2B
+ */
+
+#ifndef TEXT_H
+#define TEXT_H
+
+#include <iostream>
+
+#include <glm/glm.hpp>
+
+#include "object.h"
+
+class Shader;
+
+class Text : public Object {
+public:
+	Text();
+	~Text();
+
+// -----------------------------------------
+
+	void initialize();
+	void update();
+	void render();
+	void destroy();
+
+// -----------------------------------------
+
+	void setText(std::string text);
+
+private:
+	unsigned int m_vao;
+	unsigned int m_vbo;
+	glm::vec3 m_color;
+	Shader *m_shader;
+	std::string m_text;
+};
+
+#endif // TEXT_H

include/texture.h

@@ -0,0 +1,28 @@
+/*
+ * Rick van Vonderen
+ * 0945444
+ * TI2B
+ */
+
+#ifndef TEXTURE_H
+#define TEXTURE_H
+
+#include <string>
+#include <unordered_map>
+
+class TextureManager {
+public:
+	unsigned int loadTexture(const std::string &path);
+	void deleteTexture(const unsigned int texture);
+
+	unsigned int createTexture(
+		int format, unsigned int width, unsigned int height, const void *image,
+		int wrap, int filterMin, int filterMag, bool genMipmap = false);
+
+private:
+	std::unordered_map<std::string, unsigned int> m_textureList;
+};
+
+extern TextureManager *g_textureManager;
+
+#endif // TEXTURE_H

include/window.h

@@ -0,0 +1,69 @@
+/*
+ * Rick van Vonderen
+ * 0945444
+ * TI2B
+ */
+
+#ifndef WINDOW_H
+#define WINDOW_H
+
+#include "entity.h"
+
+class Camera;
+class GLFWwindow;
+class Shader;
+
+class Window : public Entity {
+public:
+	// Window();
+	Window(int width, int height);
+	~Window();
+
+	bool shouldClose();
+
+// -----------------------------------------
+
+	void initialize();
+	void update();
+	void render();
+	void destroy();
+
+// -----------------------------------------
+
+	int width();
+	int height();
+	float aspect();
+	float currentTime();
+	float deltaTime();
+
+	GLFWwindow *window();
+	Shader *shader();
+	Shader *shaderColor();
+	Shader *shaderFont();
+	Camera *camera();
+
+// -----------------------------------------
+
+	static void errorCallback(int error, const char *description);
+	static void keyCallback(GLFWwindow *window, int key, int scancode,
+			int action, int mode);
+	static void mouseCallback(GLFWwindow* window, double xpos, double ypos);
+
+private:
+	int m_width;
+	int m_height;
+	float m_aspect;
+	float m_currentTime;
+	float m_lastFrameTime;
+	float m_deltaTime;
+
+	GLFWwindow *m_window;
+	Shader *m_shader;
+	Shader *m_shaderColor;
+	Shader *m_shaderFont;
+	Camera *m_camera;
+};
+
+extern Window *g_window;
+
+#endif // WINDOW_H

src/camera.cpp

@@ -0,0 +1,111 @@
+#include <glm/gtx/transform.hpp> // glm::lookAt, glm::perspective
+#include <glm/ext/matrix_clip_space.hpp> // glm::perspective
+
+#include "camera.h"
+#include "input.h"
+#include "window.h"
+
+void Camera::initialize()
+{
+	setPosition(glm::vec3(0.0f, 0.0f, 3.0f));
+	setRotation(glm::vec3(0.0f, 0.0f, -1.0f));
+	setScale(glm::vec3(1.0f, 1.0f, 1.0f));
+	setFov(90.0f);
+	m_pitch = 0.0f;
+	m_yaw = 0.0f;
+	// Up vector in world space
+	m_up = glm::vec3(0.0f, 1.0f, 0.0f);
+}
+
+void Camera::update()
+{
+	// Get mouse movement offset compared to last frame
+	float xoffset = g_inputManager->xOffset() * SENSITIVITY;
+	float yoffset = g_inputManager->yOffset() * SENSITIVITY;
+	m_yaw   += xoffset;
+	m_pitch += yoffset;
+	// Prevent gimbal lock
+	if(m_pitch > 89.0f)  m_pitch =  89.0f;
+	if(m_pitch < -89.0f) m_pitch = -89.0f;
+
+	// Update camera rotation, by calculating direction vector via yaw and pitch
+	setRotation(
+		cos(glm::radians(m_pitch)) * cos(glm::radians(m_yaw)),
+		sin(glm::radians(m_pitch)),
+		cos(glm::radians(m_pitch)) * sin(glm::radians(m_yaw)));
+	setRotation(glm::normalize(rotation()));
+	// The direction vector is based on
+	// Camera direction (z): normalize(position - target)
+	// Right axis       (x): normalize(cross(up, direction))
+	// Up axis          (y): cross(direction, right)
+
+	// Source: https://learnopengl.com/img/getting-started/camera_axes.png
+
+	// Cross = combination of two vectors in 3D space,
+	//         where result is always perpendicular to both of the vectors
+
+	// Update camera position
+	float cameraSpeed = SPEED * g_window->deltaTime();
+	// WASD movement
+	if (g_inputManager->keyState(GLFW_KEY_W) == InputManager::DOWN) {
+		setPosition(position() + cameraSpeed * rotation());
+	}
+	if (g_inputManager->keyState(GLFW_KEY_S) == InputManager::DOWN) {
+		setPosition(position() - cameraSpeed * rotation());
+	}
+	if (g_inputManager->keyState(GLFW_KEY_A) == InputManager::DOWN) {
+		setPosition(position() -
+		            glm::normalize(glm::cross(rotation(), m_up)) * cameraSpeed);
+	}
+	if (g_inputManager->keyState(GLFW_KEY_D) == InputManager::DOWN) {
+		setPosition(position() +
+		            glm::normalize(glm::cross(rotation(), m_up)) * cameraSpeed);
+	}
+	// Up / down movement
+	if (g_inputManager->keyState(GLFW_KEY_SPACE) == InputManager::DOWN) {
+		setPosition(position().x, position().y + cameraSpeed, position().z);
+	}
+	if (g_inputManager->keyState(GLFW_KEY_LEFT_SHIFT) == InputManager::DOWN) {
+		setPosition(position().x, position().y - cameraSpeed, position().z);
+	}
+
+	// Update camera matrix
+
+	// Local space -> World space: model matrix
+	// Is done in Object::update()
+
+	// World space -> View space: view matrix
+	setModel(glm::lookAt(position(), position() + rotation(), m_up));
+
+	// View space -> Clip space: projection matrix
+	m_projection = glm::perspective(glm::radians(m_fov), g_window->aspect(),
+	                                NEAR_PlANE, FAR_PlANE);
+
+	// Clip space -> Screen space: viewport transform
+	// Is done in the fragment shader using the settings of glViewport
+
+	// Souce: https://learnopengl.com/img/getting-started/coordinate_systems.png
+}
+
+void Camera::render()
+{
+}
+
+void Camera::destroy()
+{
+}
+
+// -----------------------------------------
+
+float Camera::fov() {
+	return m_fov;
+}
+
+void Camera::setFov(float fov)
+{
+	m_fov = fov;
+}
+
+glm::mat4 Camera::projection() {
+	return m_projection;
+}

src/cube.cpp

@@ -0,0 +1,188 @@
+#include <cmath> // sin, fmod
+#include <cstdio> // printf
+
+#include <glad/glad.h>
+#include <GLFW/glfw3.h>
+#include <glm/gtx/transform.hpp> // glm::translate, glm::rotate, glm::scale
+
+#include "camera.h"
+#include "cube.h"
+#include "shader.h"
+#include "texture.h"
+#include "window.h"
+
+Cube::Cube() : Object(), m_color(1.0f), m_shader(nullptr)
+{
+	initialize();
+}
+
+Cube::Cube(float r, float g, float b) : Cube()
+{
+	m_color = glm::vec3(r, g, b);
+}
+
+Cube::~Cube()
+{
+	destroy();
+}
+
+// -----------------------------------------
+
+void Cube::initialize()
+{
+	printf("Cube::initialize\n");
+
+	setPosition(glm::vec3(0.0f, 0.0f, 0.0f));
+	setRotation(glm::vec3(0.0f, 0.0f, 0.0f));
+	setScale(glm::vec3(1.0f, 1.0f, 1.0f));
+
+	// Vertex attribute pointer size
+	int p1Size = 3;
+	int p2Size = 2;
+	// Vertex data
+	float vertexData[] = {
+		//  x      y      z     tx    ty
+		-0.5f, -0.5f, -0.5f,  0.0f, 0.0f,
+		 0.5f, -0.5f, -0.5f,  1.0f, 0.0f,
+		 0.5f,  0.5f, -0.5f,  1.0f, 1.0f,
+		 0.5f,  0.5f, -0.5f,  1.0f, 1.0f,
+		-0.5f,  0.5f, -0.5f,  0.0f, 1.0f,
+		-0.5f, -0.5f, -0.5f,  0.0f, 0.0f,
+
+		-0.5f, -0.5f,  0.5f,  0.0f, 0.0f,
+		 0.5f, -0.5f,  0.5f,  1.0f, 0.0f,
+		 0.5f,  0.5f,  0.5f,  1.0f, 1.0f,
+		 0.5f,  0.5f,  0.5f,  1.0f, 1.0f,
+		-0.5f,  0.5f,  0.5f,  0.0f, 1.0f,
+		-0.5f, -0.5f,  0.5f,  0.0f, 0.0f,
+
+		-0.5f,  0.5f,  0.5f,  1.0f, 0.0f,
+		-0.5f,  0.5f, -0.5f,  1.0f, 1.0f,
+		-0.5f, -0.5f, -0.5f,  0.0f, 1.0f,
+		-0.5f, -0.5f, -0.5f,  0.0f, 1.0f,
+		-0.5f, -0.5f,  0.5f,  0.0f, 0.0f,
+		-0.5f,  0.5f,  0.5f,  1.0f, 0.0f,
+
+		 0.5f,  0.5f,  0.5f,  1.0f, 0.0f,
+		 0.5f,  0.5f, -0.5f,  1.0f, 1.0f,
+		 0.5f, -0.5f, -0.5f,  0.0f, 1.0f,
+		 0.5f, -0.5f, -0.5f,  0.0f, 1.0f,
+		 0.5f, -0.5f,  0.5f,  0.0f, 0.0f,
+		 0.5f,  0.5f,  0.5f,  1.0f, 0.0f,
+
+		-0.5f, -0.5f, -0.5f,  0.0f, 1.0f,
+		 0.5f, -0.5f, -0.5f,  1.0f, 1.0f,
+		 0.5f, -0.5f,  0.5f,  1.0f, 0.0f,
+		 0.5f, -0.5f,  0.5f,  1.0f, 0.0f,
+		-0.5f, -0.5f,  0.5f,  0.0f, 0.0f,
+		-0.5f, -0.5f, -0.5f,  0.0f, 1.0f,
+
+		-0.5f,  0.5f, -0.5f,  0.0f, 1.0f,
+		 0.5f,  0.5f, -0.5f,  1.0f, 1.0f,
+		 0.5f,  0.5f,  0.5f,  1.0f, 0.0f,
+		 0.5f,  0.5f,  0.5f,  1.0f, 0.0f,
+		-0.5f,  0.5f,  0.5f,  0.0f, 0.0f,
+		-0.5f,  0.5f, -0.5f,  0.0f, 1.0f,
+	};
+	m_vSize = sizeof(vertexData) / sizeof(vertexData[0]) / (p1Size + p2Size);
+	m_shader = g_window->shader();
+
+	// Create objects
+    glGenVertexArrays(1, &m_vao);
+    glGenBuffers(1, &m_vbo);
+
+    // Bind vertex array object
+	glBindVertexArray(m_vao);
+
+	// Bind vertex buffer object
+	glBindBuffer(GL_ARRAY_BUFFER, m_vbo);
+	glBufferData(GL_ARRAY_BUFFER, sizeof(vertexData), vertexData, GL_STATIC_DRAW);
+
+	int stride = (p1Size + p2Size) * sizeof(float);
+	//~ Set vertex shader attribute pointers
+	unsigned int p1 = glGetAttribLocation(m_shader->program(), "aPos");
+	glEnableVertexAttribArray(p1);
+	// Specify vertex data interpretation
+	glVertexAttribPointer(
+		p1,        // Index
+		p1Size,    // Size
+		GL_FLOAT,  // Data type
+		GL_FALSE,  // Normalize
+		stride,    // Stride, byte offset between vertex attributes
+		(void*)0); // Pointer, byte offset
+
+	unsigned int p2 = glGetAttribLocation(m_shader->program(), "aTextCoord");
+	glEnableVertexAttribArray(p2);
+	// Specify vertex data interpretation
+	glVertexAttribPointer(
+		p2,
+		p2Size,
+		GL_FLOAT,
+		GL_FALSE,
+		stride,
+		(void*)(p1Size * sizeof(float)));
+	//~
+
+	// Unbind vertex array object
+	glBindVertexArray(0);
+
+	// Texture
+	m_texture = g_textureManager->loadTexture("../data/gfx/awesome-face.png");
+}
+
+void Cube::update()
+{
+	float timeValue = glfwGetTime();
+	float amount = std::fmod(timeValue * 50, 360);
+	setRotation(amount, amount, 0.0f);
+
+	// Call parent update
+	Object::update();
+}
+
+void Cube::render()
+{
+	// Render
+	m_shader->use();
+	m_shader->setFloat("color", glm::vec4(m_color, 1.0f));
+	m_shader->setFloat("model", model());
+	m_shader->setFloat("view", g_window->camera()->model());
+	m_shader->setFloat("projection", g_window->camera()->projection());
+
+	glBindVertexArray(m_vao);
+	glBindTexture(GL_TEXTURE_2D, m_texture);
+	glDrawArrays(GL_TRIANGLES, 0, m_vSize);
+	glBindTexture(GL_TEXTURE_2D, 0);
+	glBindVertexArray(0);
+}
+
+void Cube::destroy()
+{
+	// Clean resources
+	glDeleteVertexArrays(1, &m_vao);
+    glDeleteBuffers(1, &m_vbo);
+}
+
+// -----------------------------------------
+
+void Cube::setColor(float r, float g, float b)
+{
+	m_color = glm::vec3(r, g, b);
+}
+
+// @Todo
+// + Local postition flipped
+// + Shader textures
+// + World positions ?
+// + Cleanup and understand camera::update
+// + Cleanup cube more
+// ! Only set shader projection on camera fov update, remove projection getter
+
+// - Object: model matrix (add translate to origin before rotation)
+// - Object: model matrix (rotations in radians here or in child (cube)?)
+//   |- rotation around 2 axis ?
+//    https://learnopengl.com/Getting-started/Coordinate-Systems
+// + Object setter overload, take 3 floats as well
+// - Object setter, single float position update (?)
+// - Cube init: check if glGetAttribLocation != UINT_MAX
+// - Text in window: FPS, Player position, player rotation

src/cubecolor.cpp

@@ -0,0 +1,197 @@
+#include <cmath> // sin, fmod
+#include <cstdio> // printf
+
+#include <glad/glad.h>
+#include <GLFW/glfw3.h>
+#include <glm/gtx/transform.hpp> // glm::translate, glm::rotate, glm::scale
+
+#include "camera.h"
+#include "cubecolor.h"
+#include "shader.h"
+#include "window.h"
+
+CubeColor::CubeColor() : Object(), m_lineMode(false), m_color(1.0f), m_shader(nullptr)
+{
+	initialize();
+}
+
+CubeColor::CubeColor(float r, float g, float b, bool lineMode)
+{
+	setColor(r, g, b);
+	setLineMode(lineMode);
+	initialize();
+}
+
+CubeColor::~CubeColor()
+{
+	destroy();
+}
+
+// -----------------------------------------
+
+void CubeColor::initialize()
+{
+	printf("CubeColor::initialize\n");
+
+	setPosition(glm::vec3(0.0f, 0.0f, 0.0f));
+	setRotation(glm::vec3(0.0f, 0.0f, 0.0f));
+	setScale(glm::vec3(1.0f, 1.0f, 1.0f));
+
+	// Vertex attribute pointer size
+	int p1Size = 3;
+	int p2Size = 3;
+	// Vertex data
+	float vertexData[] = {
+		//  x      y      z      r     g     b
+		// Front
+		-0.5f, -0.5f, -0.5f,  1.0f, 0.0f, 0.0f,
+		 0.5f, -0.5f, -0.5f,  1.0f, 0.0f, 1.0f,
+		 0.5f,  0.5f, -0.5f,  1.0f, 1.0f, 1.0f,
+		 0.5f,  0.5f, -0.5f,  1.0f, 1.0f, 1.0f,
+		-0.5f,  0.5f, -0.5f,  1.0f, 1.0f, 0.0f,
+		-0.5f, -0.5f, -0.5f,  1.0f, 0.0f, 0.0f,
+		// Back
+		-0.5f, -0.5f,  0.5f,  0.0f, 0.0f, 0.0f,
+		 0.5f, -0.5f,  0.5f,  0.0f, 0.0f, 1.0f,
+		 0.5f,  0.5f,  0.5f,  0.0f, 1.0f, 1.0f,
+		 0.5f,  0.5f,  0.5f,  0.0f, 1.0f, 1.0f,
+		-0.5f,  0.5f,  0.5f,  0.0f, 1.0f, 0.0f,
+		-0.5f, -0.5f,  0.5f,  0.0f, 0.0f, 0.0f,
+		// Right
+		-0.5f,  0.5f,  0.5f,  0.0f, 1.0f, 0.0f,
+		-0.5f,  0.5f, -0.5f,  1.0f, 1.0f, 0.0f,
+		-0.5f, -0.5f, -0.5f,  1.0f, 0.0f, 0.0f,
+		-0.5f, -0.5f, -0.5f,  1.0f, 0.0f, 0.0f,
+		-0.5f, -0.5f,  0.5f,  0.0f, 0.0f, 0.0f,
+		-0.5f,  0.5f,  0.5f,  0.0f, 1.0f, 0.0f,
+		// Left
+		 0.5f,  0.5f,  0.5f,  0.0f, 1.0f, 1.0f,
+		 0.5f,  0.5f, -0.5f,  1.0f, 1.0f, 1.0f,
+		 0.5f, -0.5f, -0.5f,  1.0f, 0.0f, 1.0f,
+		 0.5f, -0.5f, -0.5f,  1.0f, 0.0f, 1.0f,
+		 0.5f, -0.5f,  0.5f,  0.0f, 0.0f, 1.0f,
+		 0.5f,  0.5f,  0.5f,  0.0f, 1.0f, 1.0f,
+		// Bottom
+		-0.5f, -0.5f, -0.5f,  1.0f, 0.0f, 0.0f,
+		 0.5f, -0.5f, -0.5f,  1.0f, 0.0f, 1.0f,
+		 0.5f, -0.5f,  0.5f,  0.0f, 0.0f, 1.0f,
+		 0.5f, -0.5f,  0.5f,  0.0f, 0.0f, 1.0f,
+		-0.5f, -0.5f,  0.5f,  0.0f, 0.0f, 0.0f,
+		-0.5f, -0.5f, -0.5f,  1.0f, 0.0f, 0.0f,
+		// To
+		-0.5f,  0.5f, -0.5f,  1.0f, 1.0f, 0.0f,
+		 0.5f,  0.5f, -0.5f,  1.0f, 1.0f, 1.0f,
+		 0.5f,  0.5f,  0.5f,  0.0f, 1.0f, 1.0f,
+		 0.5f,  0.5f,  0.5f,  0.0f, 1.0f, 1.0f,
+		-0.5f,  0.5f,  0.5f,  0.0f, 1.0f, 0.0f,
+		-0.5f,  0.5f, -0.5f,  1.0f, 1.0f, 0.0f,
+	};
+	m_vSize = sizeof(vertexData) / sizeof(vertexData[0]) / (p1Size + p2Size);
+	m_shader = g_window->shaderColor();
+
+	// If color besides glm::vec3(1.0f) has been set, overwrite rainbow pattern
+	if (m_color != glm::vec3(1.0f)) {
+		// Loop through all 'rows'
+		for (unsigned int i = p1Size; i < m_vSize * (p1Size + p2Size); i += p1Size + p2Size) {
+			vertexData[i]     = m_color.r;
+			vertexData[i + 1] = m_color.g;
+			vertexData[i + 2] = m_color.b;
+		}
+	}
+
+	// Create objects
+    glGenVertexArrays(1, &m_vao);
+    glGenBuffers(1, &m_vbo);
+
+    // Bind vertex array object
+	glBindVertexArray(m_vao);
+
+	// Bind vertex buffer object
+	glBindBuffer(GL_ARRAY_BUFFER, m_vbo);
+	glBufferData(GL_ARRAY_BUFFER, sizeof(vertexData), vertexData, GL_STATIC_DRAW);
+
+	int stride = (p1Size + p2Size) * sizeof(float);
+	//~ Set vertex shader attribute pointers
+	unsigned int p1 = glGetAttribLocation(m_shader->program(), "aPos");
+	glEnableVertexAttribArray(p1);
+	// Specify vertex data interpretation
+	glVertexAttribPointer(
+		p1,        // Index
+		p1Size,    // Size
+		GL_FLOAT,  // Data type
+		GL_FALSE,  // Normalize
+		stride,    // Stride, byte offset between vertex attributes
+		(void*)0); // Pointer, byte offset
+
+	unsigned int p2 = glGetAttribLocation(m_shader->program(), "aColor");
+	glEnableVertexAttribArray(p2);
+	// Specify vertex data interpretation
+	glVertexAttribPointer(
+		p2,
+		p2Size,
+		GL_FLOAT,
+		GL_FALSE,
+		stride,
+		(void*)(p1Size * sizeof(float)));
+	//~
+
+	// Unbind vertex array object
+	glBindVertexArray(0);
+}
+
+void CubeColor::update()
+{
+	float timeValue = glfwGetTime();
+	float loopValue = (std::sin(timeValue) / 2.0f) + 0.5f;
+	if (m_color == glm::vec3(1.0f)) {
+		setPosition(position().x, position().y, -loopValue * 6 + 6);
+	}
+	else if (m_lineMode) {
+		setScale(loopValue, loopValue, loopValue);
+	}
+
+	// Call parent update
+	Object::update();
+}
+
+void CubeColor::render()
+{
+	// Enable wireframe mode
+	if (m_lineMode) {
+		glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
+	}
+
+	// Render
+	m_shader->use();
+	m_shader->setFloat("model", model());
+	m_shader->setFloat("view", g_window->camera()->model());
+	m_shader->setFloat("projection", g_window->camera()->projection());
+
+	glBindVertexArray(m_vao);
+	glDrawArrays(GL_TRIANGLES, 0, m_vSize);
+	glBindVertexArray(0);
+
+	// Disable wireframe mode
+	if (m_lineMode) {
+		glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
+	}
+}
+
+void CubeColor::destroy()
+{
+	// Clean resources
+	glDeleteVertexArrays(1, &m_vao);
+    glDeleteBuffers(1, &m_vbo);
+}
+
+// -----------------------------------------
+
+void CubeColor::setLineMode(bool lineMode)
+{
+	m_lineMode = lineMode;
+}
+
+void CubeColor::setColor(float r, float g, float b)
+{
+	m_color = glm::vec3(r, g, b);
+}

src/entity.cpp

@@ -0,0 +1,21 @@
+#include "entity.h"
+
+Entity::Entity() : m_active(true)
+{
+}
+
+Entity::~Entity()
+{
+}
+
+// -----------------------------------------
+
+bool Entity::active() const
+{
+	return m_active;
+}
+
+void Entity::setActive(bool active)
+{
+	m_active = active;
+}

src/font.cpp

@@ -0,0 +1,86 @@
+#include <glad/glad.h>
+
+#include "font.h"
+#include "texture.h"
+
+FT_Face FontManager::loadFont(const std::string &path)
+{
+	// Return previously loaded font
+	auto iter = m_fontList.find(path);
+	if (iter != m_fontList.end()) {
+		return m_fontList[path];
+	}
+
+	// Init FreeType library
+	FT_Library ft;
+	if (FT_Init_FreeType(&ft)) {
+		printf("FontManager::loadFont::ERROR::FREETYPE: Could not init FreeType Library\n");
+	}
+
+	// Load font
+	FT_Face face;
+	if (FT_New_Face(ft, path.c_str(), 0, &face)) {
+		printf("FontManager::loadFont::FAILED\n%s\n", path.c_str());
+	}
+	else {
+		// Define font size for this face
+		FT_Set_Pixel_Sizes(face, 0, 24); // face, width, height, where width = dynamic
+
+		// Create character list of the first 128 ascii characters
+		for (unsigned char c = 0; c < 128; c++) {
+
+			// Creat 8-bit bitmap image of the character
+			if (FT_Load_Char(face, c, FT_LOAD_RENDER)) {
+				printf("FontManager::loadFont::ERROR::FREETYTPE: Failed to load Glyph\n");
+				continue;
+			}
+
+			// Create texture
+			unsigned int texture = g_textureManager->createTexture(
+				GL_RED,
+				face->glyph->bitmap.width,
+				face->glyph->bitmap.rows,
+				face->glyph->bitmap.buffer,
+				GL_CLAMP_TO_EDGE,
+				GL_LINEAR,
+				GL_LINEAR
+				);
+
+			// Create character
+			Character character = {
+				texture,
+				glm::ivec2(face->glyph->bitmap.width, face->glyph->bitmap.rows),
+				glm::ivec2(face->glyph->bitmap_left, face->glyph->bitmap_top),
+				face->glyph->advance.x
+			};
+
+			// Construct and insert new element in the map
+			m_characterList.emplace(c, character);
+		}
+
+		// Construct and insert new element in the unordered_map
+		m_fontList.emplace(path, face);
+	}
+
+	// Clean resources
+	FT_Done_Face(face);
+	FT_Done_FreeType(ft);
+
+	return face;
+}
+
+// -----------------------------------------
+
+Character FontManager::character(const char character) const
+{
+	return m_characterList.at(character);
+}
+
+const std::map<const char, Character> &FontManager::characterList() const
+{
+	return m_characterList;
+}
+
+// @Todo link fontList to characterList via:
+// <freetype/freetype.h>
+// typedef struct FT_FaceRec_*  FT_Face;

src/input.cpp

@@ -0,0 +1,120 @@
+#include <cstring> // memset, memcpy
+
+#include "input.h"
+#include "window.h"
+
+InputManager::InputManager()
+{
+	initialize();
+}
+
+InputManager::~InputManager()
+{
+	destroy();
+}
+
+// -----------------------------------------
+
+void InputManager::initialize()
+{
+	// Set every key to release state
+	memset(&m_previousKeyStates, GLFW_RELEASE, sizeof(char) * GLFW_KEY_LAST);
+	memset(&m_currentKeyStates, GLFW_RELEASE, sizeof(char) * GLFW_KEY_LAST);
+
+	m_firstMouse = true;
+	// Set cursor in middle of the screen initially
+	m_xLast = g_window->width() / 2;
+	m_yLast = g_window->height() / 2;
+}
+
+void InputManager::update()
+{
+}
+
+void InputManager::render()
+{
+	// Copy current key states to previous
+	memcpy(&m_previousKeyStates, &m_currentKeyStates, sizeof(char) * GLFW_KEY_LAST);
+
+	// Stop mouse movement
+	m_xOffset = 0.0f;
+	m_yOffset = 0.0f;
+}
+
+void InputManager::destroy()
+{
+}
+
+// -----------------------------------------
+
+char InputManager::keyState(int key)
+{
+	if (m_previousKeyStates[key] == GLFW_RELEASE &&
+	    m_currentKeyStates[key] == GLFW_RELEASE) {
+		return InputManager::UP;
+	}
+	if (m_previousKeyStates[key] == GLFW_RELEASE &&
+	    m_currentKeyStates[key] == GLFW_PRESS) {
+		return InputManager::PRESSED;
+	}
+	if (m_previousKeyStates[key] == GLFW_PRESS &&
+	    m_currentKeyStates[key] == GLFW_PRESS) {
+		return InputManager::DOWN;
+	}
+	if (m_currentKeyStates[key] == GLFW_REPEAT) {
+		return InputManager::DOWN;
+	}
+	if (m_previousKeyStates[key] == GLFW_PRESS &&
+	    m_currentKeyStates[key] == GLFW_RELEASE) {
+		return InputManager::RELEASED;
+	}
+
+	return InputManager::UP;
+}
+
+void InputManager::setKeyState(int key, int scancode, int action, int mode)
+{
+	if (key != GLFW_KEY_UNKNOWN) {
+		m_currentKeyStates[key] = (char)action;
+	}
+
+	// Suppress unused warning
+	(void)scancode;
+	(void)mode;
+}
+
+float InputManager::xOffset()
+{
+	return m_xOffset;
+}
+
+float InputManager::yOffset()
+{
+	return m_yOffset;
+}
+
+void InputManager::setMouse(double xpos, double ypos)
+{
+	// Prevent weird jump on first cursor window enter
+	if(m_firstMouse) {
+        m_xLast = xpos;
+        m_yLast = ypos;
+        m_firstMouse = false;
+    }
+
+	m_xOffset = xpos - m_xLast;
+	// Reversed since y-coordinates range from bottom to top
+	m_yOffset = m_yLast - ypos;
+	m_xLast = xpos;
+	m_yLast = ypos;
+}
+
+// @Todo
+// - Instead of copying the entire key array into the previous array each frame.
+//   Have a pointer point to one of the arrays.
+//   To read input, say: array that pointer points to now = current,
+//                       array that pointer does not point to now = previous.
+//   At the end of the frame, point the pointer to the other array.
+//   (?) How to get not point to array now easily? maybe two pointers that swap
+//       - current pointer
+//       - previous pointer

src/main.cpp

@@ -0,0 +1,70 @@
+/*
+ * Rick van Vonderen
+ * 0945444
+ * TI2B
+ *
+ * https://www.glfw.org/docs/latest/build_guide.html#build_link_cmake_source
+ *
+ * `m_` for member variables,
+ * `s_` for static variables,
+ * `g_` for global variables.
+ */
+
+#include <cstdio> // printf
+
+#include "font.h"
+#include "gamestate.h"
+#include "input.h"
+#include "state/maingame.h"
+#include "texture.h"
+#include "window.h"
+
+// Define globals here
+GameStateManager *g_gameStateManager;
+InputManager *g_inputManager;
+TextureManager *g_textureManager;
+FontManager *g_fontManager;
+Window *g_window;
+
+#include <glm/gtx/transform.hpp> // glm::translate, glm::rotate, glm::scale
+
+int main(int argc, char *argv[])
+{
+
+#ifndef NDEBUG
+	printf("--- Debug mode ---\n");
+
+	// Supress unused warning
+	(void)argc;
+	(void)argv;
+#endif
+
+	printf("--- Main ---\n");
+
+	g_window = new Window(1280, 720);
+	g_inputManager = new InputManager();
+	g_textureManager = new TextureManager();
+	g_fontManager = new FontManager();
+	g_gameStateManager = new GameStateManager();
+	g_gameStateManager->setState(new MainGame());
+
+	g_fontManager->loadFont("../data/font/DejaVuSansMono.ttf");
+
+    // Window loop
+	while (!g_window->shouldClose()) {
+		g_window->update();
+		g_inputManager->update();
+		g_gameStateManager->update();
+		g_gameStateManager->render();
+		g_inputManager->render();
+		g_window->render();
+	}
+
+	delete g_gameStateManager;
+	delete g_fontManager;
+	delete g_textureManager;
+	delete g_inputManager;
+	delete g_window;
+
+	return 0;
+}

src/object.cpp

@@ -0,0 +1,95 @@
+// #include <glm/gtx/string_cast.hpp>
+#include <glm/gtx/transform.hpp> // glm::translate, glm::rotate, glm::scale
+
+#include "object.h"
+
+Object::Object() : Entity(), m_position(), m_rotation(), m_scale(), m_model()
+{
+	// printf("obj: %s\n", glm::to_string(position()).c_str());
+}
+
+// -----------------------------------------
+
+void Object::initialize()
+{
+}
+
+void Object::update()
+{
+	// Local space -> World space: model matrix
+	m_model = glm::mat4(1.0f);
+	// Translate
+	m_model = glm::translate(m_model, position());
+	// Rotate
+	m_model = glm::rotate(m_model, glm::radians(rotation().x),
+	                          glm::vec3(1.0, 0.0, 0.0));
+	m_model = glm::rotate(m_model, glm::radians(rotation().y),
+	                          glm::vec3(0.0, 1.0, 0.0));
+	m_model = glm::rotate(m_model, glm::radians(rotation().z),
+	                          glm::vec3(0.0, 0.0, 1.0));
+	// Scale
+	m_model = glm::scale(m_model, scale());
+}
+
+void Object::render()
+{
+}
+
+void Object::destroy()
+{
+}
+
+// -----------------------------------------
+
+glm::vec3 Object::position() const
+{
+	return m_position;
+}
+
+void Object::setPosition(glm::vec3 position)
+{
+	m_position = position;
+}
+
+void Object::setPosition(float x, float y, float z)
+{
+	m_position = glm::vec3(x, y, z);
+}
+
+glm::vec3 Object::rotation() const
+{
+	return m_rotation;
+}
+
+void Object::setRotation(glm::vec3 rotation)
+{
+	m_rotation = rotation;
+}
+
+void Object::setRotation(float x, float y, float z)
+{
+	m_rotation = glm::vec3(x, y, z);
+}
+
+glm::vec3 Object::scale() const
+{
+	return m_scale;
+}
+
+void Object::setScale(glm::vec3 scale)
+{
+	m_scale = scale;
+}
+
+void Object::setScale(float x, float y, float z)
+{
+	m_scale = glm::vec3(x, y, z);
+}
+
+glm::mat4 Object::model() const {
+	return m_model;
+}
+
+void Object::setModel(glm::mat4 model) {
+	m_model = model;
+}

src/shader.cpp

@@ -0,0 +1,162 @@
+#include <climits> // UINT_MAX
+#include <cstdio>  // printf
+#include <fstream> // ifstream
+#include <iostream> // ios
+#include <memory> // make_unique
+
+#include <glad/glad.h>
+#include <glm/gtc/type_ptr.hpp> // glm::value_ptr
+
+#include "shader.h"
+
+Shader::Shader(const std::string &vertexSource, const std::string &fragmentSource) :
+	m_program(0)
+{
+	std::string vertex = readFile(vertexSource);
+	std::string fragment = readFile(fragmentSource);
+
+	unsigned int vertexShader = compileShader(GL_VERTEX_SHADER, vertex.c_str());
+	unsigned int fragmentShader = compileShader(GL_FRAGMENT_SHADER, fragment.c_str());
+	if (vertexShader != UINT_MAX && fragmentShader != UINT_MAX) {
+		m_program = linkShader(vertexShader, fragmentShader);
+	}
+}
+
+Shader::~Shader()
+{
+	if (m_program > 0) {
+		glDeleteProgram(m_program);
+		m_program = 0;
+	}
+}
+
+// -----------------------------------------
+
+std::string Shader::readFile(const std::string &path) const
+{
+	// Create input stream object and open file
+	std::ifstream file;
+	file.open(path.c_str(), std::ifstream::in);
+
+	// Check if file exists
+	if (!file.is_open()) {
+		printf("Shader::readFile::FAILED\n%s\n", path.c_str());
+		return nullptr;
+	}
+
+	// Get length of the file
+	file.seekg(0, std::ios::end);
+	unsigned int length = file.tellg();
+	file.seekg(0, std::ios::beg);
+
+	// Allocate memory filled with zeros
+	auto buffer = std::make_unique<char[]>(length + 1);
+
+	file.read(buffer.get(), length);
+	file.close();
+
+	// Create string from the buffer
+	std::string result = std::string(buffer.get(), length + 1);
+
+	return result;
+}
+
+unsigned int Shader::compileShader(unsigned int type, const char *source) const
+{
+	// Create new shader
+	unsigned int shader;
+	shader = glCreateShader(type);
+	// Attach shader source to shader object
+	glShaderSource(shader, 1, &source, nullptr);
+	// Compile shader
+	glCompileShader(shader);
+	// Check compilation status
+	if (checkStatus(shader)) {
+		return shader;
+	}
+
+	// On fail
+	glDeleteShader(shader);
+	return UINT_MAX;
+}
+
+unsigned int Shader::linkShader(unsigned int vertex, unsigned int fragment) const
+{
+	// Create new shader program
+	unsigned int shaderProgram;
+	shaderProgram = glCreateProgram();
+	// Attach both shaders to the shader program
+	glAttachShader(shaderProgram, vertex);
+	glAttachShader(shaderProgram, fragment);
+	// Setup vertex attributes
+	glBindAttribLocation(shaderProgram, 0, "aPos");
+	// Link the shaders
+	glLinkProgram(shaderProgram);
+	// Clear resources
+	glDeleteShader(vertex);
+	glDeleteShader(fragment);
+	// Check linking status
+	if (checkStatus(shaderProgram, true)) {
+		return shaderProgram;
+	}
+
+	// On fail
+	glDeleteProgram(shaderProgram);
+	return UINT_MAX;
+}
+
+int Shader::checkStatus(unsigned int check, bool isProgram) const
+{
+	int  success;
+	char infoLog[INFO_LOG_SIZE];
+
+	// Check shader or program
+	!isProgram
+		? glGetShaderiv(check, GL_COMPILE_STATUS, &success)
+		: glGetProgramiv(check, GL_LINK_STATUS, &success);
+
+	if (!success) {
+		// Check shader or program
+		!isProgram
+			? glGetShaderInfoLog(check, INFO_LOG_SIZE, nullptr, infoLog)
+			: glGetProgramInfoLog(check, INFO_LOG_SIZE, nullptr, infoLog);
+		printf("Shader::checkStatus::FAILED\n%s\n", infoLog);
+	}
+
+	return success;
+}
+
+void Shader::use() const
+{
+	glUseProgram(m_program);
+}
+
+void Shader::setFloat(const std::string &name, float f1, float f2, float f3, float f4) const
+{
+	// Set uniform vec4 data
+	glUniform4f(glGetUniformLocation(m_program, name.c_str()), f1, f2, f3, f4);
+}
+
+void Shader::setFloat(const std::string &name, glm::vec3 v) const {
+	// Set uniform vec3 data
+	glUniform3f(glGetUniformLocation(m_program, name.c_str()), v.x, v.y, v.z);
+}
+
+void Shader::setFloat(const std::string &name, glm::vec4 v) const {
+	// Set uniform vec4 data
+	glUniform4f(glGetUniformLocation(m_program, name.c_str()), v.x, v.y, v.z, v.w);
+	// glUniform4fv(glGetUniformLocation(m_program, name.c_str()), 1, glm::value_ptr(v));
+}
+
+void Shader::setFloat(const std::string &name, glm::mat4 m) const {
+	// Set uniform mat4 data
+	glUniformMatrix4fv(glGetUniformLocation(m_program, name.c_str()),
+	                   1, GL_FALSE, glm::value_ptr(m));
+}
+
+// -----------------------------------------
+
+unsigned int Shader::program() const
+{
+	return m_program;
+}

src/state/maingame.cpp

@@ -0,0 +1,100 @@
+#include <cstdio> // printf
+
+#include <glm/glm.hpp>
+
+#include "cube.h"
+#include "cubecolor.h"
+#include "state/maingame.h"
+#include "text.h"
+
+void MainGame::initialize() {
+	printf("MainGame::initialize\n");
+
+	glm::vec3 cubeColors[CUBE_SIZE] = {
+		// Textured cube
+		glm::vec3( 0.6f,  0.2f,  0.2f),
+		glm::vec3( 0.2f,  0.6f,  0.2f),
+		glm::vec3( 0.2f,  0.2f,  0.6f),
+		glm::vec3( 1.0f,  1.0f,  1.0f),
+		glm::vec3( 1.0f,  1.0f,  1.0f),
+		glm::vec3( 1.0f,  1.0f,  1.0f),
+		// Colored cube
+		glm::vec3( 0.6f,  0.2f,  0.2f),
+		glm::vec3( 0.2f,  0.6f,  0.2f),
+		glm::vec3( 0.2f,  0.2f,  0.6f),
+		glm::vec3( 0.6f,  0.2f,  0.2f),
+		glm::vec3( 0.2f,  0.6f,  0.2f),
+		glm::vec3( 0.2f,  0.2f,  0.6f),
+		glm::vec3( 1.0f,  1.0f,  1.0f),
+		glm::vec3( 1.0f,  1.0f,  1.0f),
+		glm::vec3( 1.0f,  1.0f,  1.0f),
+	};
+
+	glm::vec3 cubePositions[CUBE_SIZE] = {
+		// Textured cube
+		glm::vec3( 0.0f,  0.0f,  0.0f),
+		glm::vec3( 2.0f,  0.0f,  0.0f),
+		glm::vec3( 4.0f,  0.0f,  0.0f),
+		glm::vec3( 0.0f,  2.0f,  0.0f),
+		glm::vec3( 2.0f,  2.0f,  0.0f),
+		glm::vec3( 4.0f,  2.0f,  0.0f),
+		// Colored cube
+		glm::vec3( 0.0f,  0.0f,  6.0f),
+		glm::vec3( 2.0f,  0.0f,  6.0f),
+		glm::vec3( 4.0f,  0.0f,  6.0f),
+		glm::vec3( 0.0f,  2.0f,  6.0f),
+		glm::vec3( 2.0f,  2.0f,  6.0f),
+		glm::vec3( 4.0f,  2.0f,  6.0f),
+		glm::vec3( 0.0f,  4.0f,  6.0f),
+		glm::vec3( 2.0f,  4.0f,  6.0f),
+		glm::vec3( 4.0f,  4.0f,  6.0f),
+	};
+
+	bool cubeLine[CUBE_SIZE] = {
+		// Colored cube
+		false,
+		false,
+		false,
+		true,
+		true,
+		true,
+		true,
+	};
+
+	for(int i = 0; i < CUBE; i++) {
+		m_object[i] = new Cube(cubeColors[i].x, cubeColors[i].y, cubeColors[i].z);
+		m_object[i]->setPosition(cubePositions[i]);
+	}
+	for(int i = CUBE; i < CUBE_SIZE; i++) {
+		m_object[i] = new CubeColor(cubeColors[i].x, cubeColors[i].y, cubeColors[i].z,
+		                            cubeLine[i - CUBE]);
+		m_object[i]->setPosition(cubePositions[i]);
+	}
+
+	m_text = new Text();
+	m_text->setText("Test");
+}
+
+void MainGame::update() {
+	for(int i = 0; i < CUBE_SIZE; i++) {
+		m_object[i]->update();
+	}
+
+	m_text->update();
+}
+
+void MainGame::render() {
+	for(int i = 0; i < CUBE_SIZE; i++) {
+		m_object[i]->render();
+	}
+
+	m_text->render();
+}
+
+void MainGame::destroy() {
+	for(int i = 0; i < CUBE_SIZE; i++) {
+		m_object[i]->destroy();
+	}
+
+	m_text->destroy();
+}

src/text.cpp

@@ -0,0 +1,117 @@
+#include <cstdio> // printf
+// #include <iostream>
+
+#include <glad/glad.h>
+#include <glm/ext/matrix_clip_space.hpp> // glm::ortho
+
+#include "font.h"
+#include "shader.h"
+#include "text.h"
+#include "texture.h"
+#include "window.h"
+
+Text::Text() : Object(), m_color(1.0f), m_shader(nullptr), m_text("")
+{
+	initialize();
+}
+
+Text::~Text()
+{
+	destroy();
+}
+
+// -----------------------------------------
+
+void Text::initialize()
+{
+	setScale(1.0f, 1.0f, 1.0f);
+
+	m_shader = g_window->shaderFont();
+
+	// Generate buffer
+	glGenVertexArrays(1, &m_vao);
+	glGenBuffers(1, &m_vbo);
+	glBindVertexArray(m_vao);
+	glBindBuffer(GL_ARRAY_BUFFER, m_vbo);
+	glBufferData(GL_ARRAY_BUFFER, sizeof(float) * 6 * 4, NULL, GL_DYNAMIC_DRAW);
+	glEnableVertexAttribArray(0);
+	glVertexAttribPointer(0, 4, GL_FLOAT, GL_FALSE, 4 * sizeof(float), (void *)0);
+	glBindBuffer(GL_ARRAY_BUFFER, 0);
+	glBindVertexArray(0);
+}
+
+void Text::update()
+{
+	setPosition(50.0f, 50.0f, 0.0f);
+}
+
+void Text::render()
+{
+	glEnable(GL_BLEND);
+	glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
+
+	// Render
+	m_shader->use();
+	m_shader->setFloat("color", m_color);
+	m_shader->setFloat("projection", glm::ortho(
+		                   0.0f, (float)g_window->width(),
+		                   0.0f, (float)g_window->height()));
+
+	// glActiveTexture(GL_TEXTURE0);
+	glBindVertexArray(m_vao);
+
+	// Iterate through all characters
+    std::string::const_iterator c;
+    for (c = m_text.begin(); c != m_text.end(); c++)
+    {
+	    Character ch = g_fontManager->character(*c);
+	    // printf("ch:  %u, %d %d, %d %d, %u\n",
+	    //        ch.texture, ch.size.x, ch.size.y, ch.bearing.x, ch.bearing.y, ch.advance);
+
+	    float xpos = position().x + ch.bearing.x * scale().x;
+	    float ypos = position().y - (ch.size.y - ch.bearing.y) * scale().x;
+	    // printf("xpos-ypos:  %f, %f\n", xpos, ypos);
+
+	    float w = ch.size.x * scale().x;
+	    float h = ch.size.y * scale().x;
+	    // printf("w-h:  %f, %f\n", w, h);
+
+        // Update VBO for each character
+        float vertices[6][4] = {
+            { xpos,     ypos + h,   0.0, 0.0 },
+            { xpos,     ypos,       0.0, 1.0 },
+            { xpos + w, ypos,       1.0, 1.0 },
+
+            { xpos,     ypos + h,   0.0, 0.0 },
+            { xpos + w, ypos,       1.0, 1.0 },
+            { xpos + w, ypos + h,   1.0, 0.0 }
+        };
+        // Render glyph texture over quad
+        glBindTexture(GL_TEXTURE_2D, ch.texture);
+        // Update content of VBO memory
+        glBindBuffer(GL_ARRAY_BUFFER, m_vbo);
+        glBufferSubData(GL_ARRAY_BUFFER, 0, sizeof(vertices), vertices);
+        glBindBuffer(GL_ARRAY_BUFFER, 0);
+        // Render quad
+        glDrawArrays(GL_TRIANGLES, 0, 6);
+        // Now advance cursors for next glyph (note that advance is number of 1/64 pixels)
+        // Bitshift by 6 to get value in pixels (2^6 = 64)
+        setPosition(position().x + (ch.advance >> 6) * scale().x, position().y, position().z);
+    }
+
+	// printf("\n");
+
+	glBindVertexArray(0);
+	glBindTexture(GL_TEXTURE_2D, 0);
+}
+
+void Text::destroy()
+{
+}
+
+// -----------------------------------------
+
+void Text::setText(std::string text)
+{
+	m_text = text;
+}

src/texture.cpp

@@ -0,0 +1,105 @@
+#include <climits> // UINT_MAX
+
+#include <glad/glad.h>
+#define STB_IMAGE_IMPLEMENTATION
+#include <stb_image.h>
+
+#include "texture.h"
+
+unsigned int TextureManager::loadTexture(const std::string &path)
+{
+	// Return previously loaded texture
+	auto iter = m_textureList.find(path);
+	if (iter != m_textureList.end()) {
+		return m_textureList[path];
+	}
+
+	int width;
+	int height;
+	int channels;
+	// Load image data
+	stbi_set_flip_vertically_on_load(true);
+	unsigned char *image = stbi_load(path.c_str(), &width, &height, &channels, STBI_default);
+
+	unsigned int texture = UINT_MAX;
+	if (!image) {
+		printf("TextureManager::loadTexure::FAILED\n%s\n", path.c_str());
+	}
+	else {
+		int format = 0;
+		if (channels == 3) {
+			format = GL_RGB;
+		}
+		else if (channels == 4) {
+			format = GL_RGBA;
+		}
+
+		// Generate texture
+		texture = createTexture(
+			format,
+			width,
+			height,
+			image,
+			GL_REPEAT,
+			GL_NEAREST,
+			GL_NEAREST,
+			true);
+
+		// Construct and insert new element in the unordered_map
+		m_textureList.emplace(path, texture);
+	}
+
+	// Clean resources
+	stbi_image_free(image);
+
+	return texture;
+}
+
+void TextureManager::deleteTexture(const unsigned int texture)
+{
+	glDeleteTextures(1, &texture);
+}
+
+unsigned int TextureManager::createTexture(
+	int format, unsigned int width, unsigned int height, const void *image,
+	int wrap, int filterMin, int filterMag, bool genMipmap)
+{
+	unsigned int texture = UINT_MAX;
+
+	// Create texture object
+	glGenTextures(1, &texture);
+
+	// Bind texture object
+	glBindTexture(GL_TEXTURE_2D, texture);
+
+	// Set unpacking of pixel data to byte-alignment,
+	// this prevents alignment issues when using a single byte for color
+	glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
+
+    // Generate texture
+	glTexImage2D(
+		GL_TEXTURE_2D,    // Texture target
+		0,                // Midmap level, base starts at level 0
+		format,           // Texture format
+		width, height,    // Image width/height
+		0,                // Always 0 (legacy)
+		format,           // Texture source format
+		GL_UNSIGNED_BYTE, // Texture source datatype
+		image);           // Image data
+
+	// Set the texture wrapping / filtering options
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, wrap); // X
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, wrap); // Y
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, filterMin); // Minify
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, filterMag); // Magnify
+
+	if (genMipmap) {
+		// Automatically generate all mipmap levels
+		glGenerateMipmap(GL_TEXTURE_2D);
+	}
+
+	// Unbind texture object
+	glBindTexture(GL_TEXTURE_2D, 0);
+
+    return texture;
+}

src/window.cpp

@@ -0,0 +1,215 @@
+#include <cstdio>  // printf
+
+#include <glad/glad.h>
+#include <GLFW/glfw3.h>
+#include <glm/glm.hpp>
+#include <stb_image.h>
+
+#include "camera.h"
+#include "input.h"
+#include "shader.h"
+#include "window.h"
+
+// Window::Window() : Entity(), m_width(0), m_height(0)
+// {
+// }
+
+Window::Window(int width, int height) : Entity(), m_width(width), m_height(height)
+{
+	this->initialize();
+}
+
+Window::~Window()
+{
+	this->destroy();
+}
+
+bool Window::shouldClose()
+{
+	return glfwWindowShouldClose(m_window);
+}
+
+// -----------------------------------------
+
+void Window::initialize()
+{
+	// Error callback function
+	glfwSetErrorCallback(Window::errorCallback);
+
+	// Init GLFW and set the required options
+	glfwInit();
+	glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
+	glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 0);
+	glfwWindowHint(GLFW_RESIZABLE, GL_FALSE);
+
+	// Create a GLFWwindow object that can be used for GLFW's functions
+	m_window = glfwCreateWindow(m_width, m_height,
+			"Lines", NULL, NULL);
+	glfwMakeContextCurrent(m_window);
+	if (m_window == NULL) {
+		printf("Failed to create GLFW window\n");
+		glfwTerminate();
+	}
+
+	if (!gladLoadGLLoader((GLADloadproc)glfwGetProcAddress)) {
+		printf("Failed to initialize OpenGL context\n");
+	}
+
+	// Associate the wrapper to the window
+	glfwSetWindowUserPointer(m_window, this);
+
+	// Keyboard callback function
+	glfwSetKeyCallback(m_window, Window::keyCallback);
+
+	// Capture cursor and hide it
+	glfwSetInputMode(m_window, GLFW_CURSOR, GLFW_CURSOR_DISABLED);
+
+	// Mouse callback function
+	glfwSetCursorPosCallback(m_window, Window::mouseCallback);
+
+	// Load shaders
+	m_shader = new Shader("../data/glsl/simple.vert", "../data/glsl/simple.frag");
+	m_shaderColor = new Shader("../data/glsl/color.vert", "../data/glsl/color.frag");
+	m_shaderFont = new Shader("../data/glsl/font.vert", "../data/glsl/font.frag");
+
+	// Enable z-buffer / depth buffer
+	glEnable(GL_DEPTH_TEST);
+
+	m_lastFrameTime = 0.0f;
+	m_deltaTime = 0.0f;
+
+	// Initialize camera
+	m_camera = new Camera();
+	m_camera->initialize();
+}
+
+void Window::update()
+{
+	// Clear buffers
+	glClearColor(0.2f, 0.3f, 0.3f, 1.0f);
+	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+
+	// Check if any events have been activated (keypresses, mouse movement)
+	glfwPollEvents();
+
+	// Reset the viewport to the new window size
+	glfwGetFramebufferSize(m_window, &m_width, &m_height);
+	m_aspect = (float)m_width / (float)m_height;
+	glViewport(0, 0, m_width, m_height);
+
+	// Calculate delta time
+	m_currentTime = glfwGetTime();
+	m_deltaTime = m_currentTime - m_lastFrameTime;
+	m_lastFrameTime = m_currentTime;
+
+	m_camera->update();
+}
+
+void Window::render()
+{
+	m_camera->render();
+
+	// Swap the screen buffers
+	glfwSwapBuffers(m_window);
+}
+
+void Window::destroy()
+{
+	delete m_shader;
+	delete m_shaderColor;
+	delete m_shaderFont;
+	delete m_camera;
+
+	// Clean GLFW allocated resources
+	glfwDestroyWindow(m_window);
+	glfwTerminate();
+	printf("Cleaned up GLFW resources..\n");
+}
+
+// -----------------------------------------
+
+int Window::width()
+{
+	return m_width;
+}
+
+int Window::height()
+{
+	return m_height;
+}
+
+float Window::aspect()
+{
+	return m_aspect;
+}
+
+float Window::currentTime()
+{
+	return m_currentTime;
+}
+
+float Window::deltaTime()
+{
+	return m_deltaTime;
+}
+
+GLFWwindow *Window::window()
+{
+	return m_window;
+}
+
+Shader *Window::shader()
+{
+	return m_shader;
+}
+
+Shader *Window::shaderColor()
+{
+	return m_shaderColor;
+}
+
+Shader *Window::shaderFont()
+{
+	return m_shaderFont;
+}
+
+Camera *Window::camera()
+{
+	return m_camera;
+}
+
+// -----------------------------------------
+
+void Window::errorCallback(int error, const char* description)
+{
+	fputs(description, stderr);
+
+	// Suppress unused warning
+	(void)error;
+}
+
+void Window::keyCallback(GLFWwindow* window, int key, int scancode,
+		int action, int mode)
+{
+	// printf("%d\n", key);
+
+	// Quit game
+	if (key == GLFW_KEY_ESCAPE && action == GLFW_PRESS)
+		glfwSetWindowShouldClose(window, GL_TRUE);
+
+	// Mouse capture
+	if (key == GLFW_KEY_LEFT_SUPER && action == GLFW_PRESS)
+		glfwSetInputMode(window, GLFW_CURSOR, GLFW_CURSOR_NORMAL);
+	else
+		glfwSetInputMode(window, GLFW_CURSOR, GLFW_CURSOR_DISABLED);
+
+	g_inputManager->setKeyState(key, scancode, action, mode);
+}
+
+void Window::mouseCallback(GLFWwindow* window, double xpos, double ypos)
+{
+	g_inputManager->setMouse(xpos, ypos);
+
+	// Suppress unused warning
+	(void)window;
+}