Add basics for breakout game, separate tutorial code

Dengine.vcxproj

@@ -122,8 +122,10 @@
   <ItemGroup>
     <ClCompile Include="src\AssetManager.cpp" />
     <ClCompile Include="src\dengine.cpp" />
+    <ClCompile Include="src\Game.cpp" />
     <ClCompile Include="src\Shader.cpp" />
     <ClCompile Include="src\Texture.cpp" />
+    <ClCompile Include="src\Tutorial.cpp" />
   </ItemGroup>
   <ItemGroup>
     <None Include="data\shaders\default.frag.glsl" />
@@ -132,6 +134,7 @@
   <ItemGroup>
     <ClInclude Include="src\include\Dengine\AssetManager.h" />
     <ClInclude Include="src\include\Dengine\Common.h" />
+    <ClInclude Include="src\include\Breakout\Game.h" />
     <ClInclude Include="src\include\Dengine\OpenGL.h" />
     <ClInclude Include="src\include\Dengine\Shader.h" />
     <ClInclude Include="src\include\Dengine\Texture.h" />

Dengine.vcxproj.filters

@@ -27,6 +27,12 @@
     <ClCompile Include="src\AssetManager.cpp">
       <Filter>Source Files</Filter>
     </ClCompile>
+    <ClCompile Include="src\Game.cpp">
+      <Filter>Source Files</Filter>
+    </ClCompile>
+    <ClCompile Include="src\Tutorial.cpp">
+      <Filter>Source Files</Filter>
+    </ClCompile>
   </ItemGroup>
   <ItemGroup>
     <None Include="data\shaders\default.vert.glsl" />
@@ -48,5 +54,8 @@
     <ClInclude Include="src\include\Dengine\AssetManager.h">
       <Filter>Header Files</Filter>
     </ClInclude>
+    <ClInclude Include="src\include\Breakout\Game.h">
+      <Filter>Header Files</Filter>
+    </ClInclude>
   </ItemGroup>
 </Project>

src/Game.cpp

@@ -0,0 +1,13 @@
+#include <Breakout\Game.h>
+
+namespace Breakout
+{
+Game::Game(i32 width, i32 height) {}
+Game::~Game() {}
+
+void Game::init() {}
+
+void Game::processInput(f32 dt) {}
+void Game::update(f32 dt) {}
+void Game::render() {}
+}

src/Texture.cpp

@@ -16,14 +16,44 @@ Texture::Texture()
 	glGenTextures(1, &mId);
 }
 
+enum BytesPerPixel
+{
+	Greyscale      = 1,
+	GreyscaleAlpha = 2,
+	RGB            = 3,
+	RGBA           = 4,
+};
+
+INTERNAL GLint getGLFormat(BytesPerPixel bytesPerPixel, b32 srgb)
+{
+	switch (bytesPerPixel)
+	{
+		case Greyscale:
+			return GL_LUMINANCE;
+		case GreyscaleAlpha:
+			return GL_LUMINANCE_ALPHA;
+		case RGB:
+			return (srgb ? GL_SRGB : GL_RGB);
+		case RGBA:
+			return (srgb ? GL_SRGB_ALPHA : GL_RGBA);
+		default:
+			// TODO(doyle): Invalid
+		    //std::cout << "getGLFormat() invalid bytesPerPixel: "
+		    //          << bytesPerPixel << std::endl;
+		    return GL_LUMINANCE;
+	}
+}
+
 void Texture::generate(GLuint width, GLuint height, u8 *image)
 {
+	// TODO(doyle): Let us set the parameters gl params as well 
 	mWidth  = width;
 	mHeight = height;
 
 	glBindTexture(GL_TEXTURE_2D, mId);
 
 	/* Load image into texture */
+	// TODO(doyle) Figure out the gl format
 	glTexImage2D(GL_TEXTURE_2D, 0, mInternalFormat, mWidth, mHeight, 0,
 	             mImageFormat, GL_UNSIGNED_BYTE, image);
 	glGenerateMipmap(GL_TEXTURE_2D);

src/Tutorial.cpp

@@ -0,0 +1,377 @@
+#if 0
+#include <Dengine/OpenGL.h>
+#include <Dengine/Common.h>
+#include <Dengine/Shader.h>
+#include <Dengine/AssetManager.h>
+
+#include <glm/glm.hpp>
+#include <glm/gtc/matrix_transform.hpp>
+#include <glm/gtc/type_ptr.hpp>
+
+#include <iostream>
+#include <cstdint>
+#include <fstream>
+#include <string>
+
+glm::vec3 cameraPos   = glm::vec3(0.0f, 0.0f, 3.0f);
+glm::vec3 cameraFront = glm::vec3(0.0f, 0.0f, -1.0f);
+glm::vec3 cameraUp    = glm::vec3(0.0f, 1.0f, 0.0f);
+
+f32 lastX = 400;
+f32 lastY = 300;
+f32 yaw   = -90.0f;
+f32 pitch = 0.0f;
+f32 fov   = 45.0f;
+b32 firstMouse;
+
+b32 keys[1024];
+
+enum BytesPerPixel
+{
+	Greyscale      = 1,
+	GreyscaleAlpha = 2,
+	RGB            = 3,
+	RGBA           = 4,
+};
+
+INTERNAL GLint getGLFormat(BytesPerPixel bytesPerPixel, b32 srgb)
+{
+	switch (bytesPerPixel)
+	{
+		case Greyscale:
+			return GL_LUMINANCE;
+		case GreyscaleAlpha:
+			return GL_LUMINANCE_ALPHA;
+		case RGB:
+			return (srgb ? GL_SRGB : GL_RGB);
+		case RGBA:
+			return (srgb ? GL_SRGB_ALPHA : GL_RGBA);
+		default:
+			// TODO(doyle): Invalid
+		    std::cout << "getGLFormat() invalid bytesPerPixel: "
+		              << bytesPerPixel << std::endl;
+		    return GL_LUMINANCE;
+	}
+}
+
+void doMovement(f32 deltaTime)
+{
+	f32 cameraSpeed = 5.00f * deltaTime;
+	if (keys[GLFW_KEY_W])
+		cameraPos += (cameraSpeed * cameraFront);
+	if (keys[GLFW_KEY_S])
+		cameraPos -= (cameraSpeed * cameraFront);
+	if (keys[GLFW_KEY_A])
+		cameraPos -=
+		    glm::normalize(glm::cross(cameraFront, cameraUp)) * cameraSpeed;
+	if (keys[GLFW_KEY_D])
+		cameraPos +=
+		    glm::normalize(glm::cross(cameraFront, cameraUp)) * cameraSpeed;
+}
+
+void key_callback(GLFWwindow *window, int key, int scancode, int action,
+                  int mode)
+{
+	if (key == GLFW_KEY_ESCAPE && action == GLFW_PRESS)
+	{
+		glfwSetWindowShouldClose(window, GL_TRUE);
+	}
+
+	if (key >= 0 && key < 1024)
+	{
+		if (action == GLFW_PRESS)
+			keys[key] = TRUE;
+		else if (action == GLFW_RELEASE)
+			keys[key] = FALSE;
+	}
+}
+
+void mouse_callback(GLFWwindow *window, double xPos, double yPos)
+{
+	if (firstMouse)
+	{
+		lastX = (f32)xPos;
+		lastY = (f32)yPos;
+		firstMouse = false;
+	}
+
+	f32 xOffset = (f32)xPos - lastX;
+	f32 yOffset = lastY - (f32)yPos;
+	lastX = (f32)xPos;
+	lastY = (f32)yPos;
+
+	f32 sensitivity = 0.05f;
+	xOffset *= sensitivity;
+	yOffset *= sensitivity;
+
+	yaw   += xOffset;
+	pitch += yOffset;
+
+	if (pitch > 89.0f)
+		pitch = 89.0f;
+	else if (pitch < -89.0f)
+		pitch = -89.0f;
+
+	glm::vec3 front;
+	front.x     = cos(glm::radians(pitch)) * cos(glm::radians(yaw));
+	front.y     = sin(glm::radians(pitch));
+	front.z     = cos(glm::radians(pitch)) * sin(glm::radians(yaw));
+	cameraFront = glm::normalize(front);
+}
+
+void scroll_callback(GLFWwindow *window, double xOffset, double yOffset)
+{
+	if (fov >= 1.0f && fov <= 45.0f)
+		fov -= (f32)yOffset;
+	else if (fov <= 1.0f)
+		fov = 1.0f;
+	else // fov >= 45.0f
+		fov = 45.0f;
+}
+
+GLenum glCheckError_(const char *file, int line)
+{
+	GLenum errorCode;
+	while ((errorCode = glGetError()) != GL_NO_ERROR)
+	{
+		std::string error;
+		switch (errorCode)
+		{
+		case GL_INVALID_ENUM:
+			error = "INVALID_ENUM";
+			break;
+		case GL_INVALID_VALUE:
+			error = "INVALID_VALUE";
+			break;
+		case GL_INVALID_OPERATION:
+			error = "INVALID_OPERATION";
+			break;
+		case GL_STACK_OVERFLOW:
+			error = "STACK_OVERFLOW";
+			break;
+		case GL_STACK_UNDERFLOW:
+			error = "STACK_UNDERFLOW";
+			break;
+		case GL_OUT_OF_MEMORY:
+			error = "OUT_OF_MEMORY";
+			break;
+		case GL_INVALID_FRAMEBUFFER_OPERATION:
+			error = "INVALID_FRAMEBUFFER_OPERATION";
+			break;
+		}
+		std::cout << error << " | " << file << " (" << line << ")" << std::endl;
+	}
+	return errorCode;
+}
+#define glCheckError() glCheckError_(__FILE__, __LINE__)
+
+int main()
+{
+	glfwInit();
+	glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
+	glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
+	glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
+	glfwWindowHint(GLFW_RESIZABLE, GL_FALSE);
+
+	glm::ivec2 windowSize = glm::ivec2(800, 600);
+
+	GLFWwindow *window = glfwCreateWindow(windowSize.x, windowSize.y,
+	                                      "LearnOpenGL", nullptr, nullptr);
+
+	if (!window)
+	{
+		std::cout << "glfwCreateWindow() failed: Failed to create window" << std::endl;
+		glfwTerminate();
+		return -1;
+	}
+
+	glfwMakeContextCurrent(window);
+
+	/* Make GLEW use more modern technies for OGL on core profile*/
+	glewExperimental = GL_TRUE;
+	if (glewInit() != GLEW_OK)
+	{
+		std::cout << "glewInit() failed: Failed to initialise GLEW"
+		          << std::endl;
+		return -1;
+	}
+
+	glm::ivec2 frameBufferSize;
+	glfwGetFramebufferSize(window, &frameBufferSize.x, &frameBufferSize.y);
+	glViewport(0, 0, frameBufferSize.x, frameBufferSize.y);
+
+	glfwSetKeyCallback(window, key_callback);
+	glfwSetCursorPosCallback(window, mouse_callback);
+	glfwSetScrollCallback(window, scroll_callback);
+
+	glfwSetInputMode(window, GLFW_CURSOR, GLFW_CURSOR_DISABLED);
+	firstMouse = TRUE;
+
+	glEnable(GL_DEPTH_TEST | GL_CULL_FACE);
+	glCullFace(GL_BACK);
+
+	/* Initialise shaders */
+	Dengine::AssetManager assetManager;
+	i32 result = 0;
+
+	result = assetManager.loadShaderFiles("data/shaders/default.vert.glsl",
+	                                      "data/shaders/default.frag.glsl",
+	                                      "default");
+	if (result) return result;
+
+	/* Load a texture */
+	result = assetManager.loadTextureImage("data/textures/container.jpg",
+	                                       "container");
+	if (result) return result;
+
+	result = assetManager.loadTextureImage("data/textures/wall.jpg",
+	                                       "wall");
+	if (result) return result;
+
+	Dengine::Texture *containerTex = assetManager.getTexture("container");
+	Dengine::Texture *wallTex = assetManager.getTexture("wall");
+	Dengine::Shader *shader = assetManager.getShader("default");
+
+	/* Create OGL Vertex objects */
+	GLfloat sceneVertex[] = {
+		// Positions          Colors             Texture Coords
+		// Floor
+		+0.5f, +0.5f, +0.0f,  1.0f, 0.0f, 0.0f,  1.0f, 1.0f, // Top Right
+		+0.5f, -0.5f, +0.0f,  0.0f, 1.0f, 0.0f,  1.0f, 0.0f, // Bottom Right
+		-0.5f, -0.5f, +0.0f,  0.0f, 0.0f, 1.0f,  0.0f, 0.0f, // Bottom left
+		-0.5f, +0.5f, +0.0f,  1.0f, 1.0f, 0.0f,  0.0f, 1.0f, // Top left
+
+		// Wall
+		+0.5f, +0.5f, +0.0f,  1.0f, 0.0f, 0.0f,  1.0f, 1.0f, // Top Right
+		+0.5f, -0.5f, +0.0f,  0.0f, 1.0f, 0.0f,  1.0f, 0.0f, // Bottom Right
+		-0.5f, -0.5f, +0.0f,  0.0f, 0.0f, 1.0f,  0.0f, 0.0f, // Bottom left
+		-0.5f, +0.5f, +0.0f,  1.0f, 1.0f, 0.0f,  0.0f, 1.0f, // Top left
+	};
+
+	GLuint sceneIndices[] = {
+		// Floor
+	    0, 3, 1, // First triangle
+	    1, 2, 3, // Second triangle
+
+		// Wall
+	    4, 7, 5, // First triangle
+	    5, 6, 7, // Second triangle
+	};
+
+	GLuint vbo, vao;
+	glGenVertexArrays(1, &vao);
+	glGenBuffers(1, &vbo);
+	GLuint ebo;
+	glGenBuffers(1, &ebo);
+
+	// 1. Bind vertex array object
+	glBindVertexArray(vao);
+
+	// 2. Bind and set vertex buffer(s) and attribute pointer(s)
+	glBindBuffer(GL_ARRAY_BUFFER, vbo);
+	glBufferData(GL_ARRAY_BUFFER, sizeof(sceneVertex), sceneVertex,
+	             GL_STATIC_DRAW);
+
+	glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, ebo);
+	glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(sceneIndices), sceneIndices,
+	             GL_STATIC_DRAW);
+
+	const i32 numPos      = 3;
+	const i32 numColors   = 3;
+	const i32 numTexCoord = 2;
+
+	const GLint vertexSize =
+	    (numPos + numColors + numTexCoord) * sizeof(GLfloat);
+
+	const GLint vertByteOffset     = 0;
+	const GLint colorByteOffset    = vertByteOffset + (numPos * sizeof(GLfloat));
+	const GLint texCoordByteOffset = colorByteOffset + (numColors * sizeof(GLfloat));
+
+	glVertexAttribPointer(0, numPos, GL_FLOAT, GL_FALSE, vertexSize,
+	                      (GLvoid *)vertByteOffset);
+	glEnableVertexAttribArray(0);
+	glVertexAttribPointer(1, numColors, GL_FLOAT, GL_FALSE, vertexSize,
+	                      (GLvoid *)colorByteOffset);
+	glEnableVertexAttribArray(1);
+	glVertexAttribPointer(2, numTexCoord, GL_FLOAT, GL_FALSE, vertexSize,
+	                      (GLvoid *)texCoordByteOffset);
+	glEnableVertexAttribArray(2);
+
+	// 4. Unbind to prevent mistakes
+	glBindBuffer(GL_ARRAY_BUFFER, 0);
+	glBindVertexArray(0);
+
+	f32 deltaTime = 0.0f; // Time between current frame and last frame
+	f32 lastFrame = 0.0f; // Time of last frame
+
+	/* Main game loop */
+	while (!glfwWindowShouldClose(window))
+	{
+		f32 currentFrame = (f32)glfwGetTime();
+		deltaTime = currentFrame - lastFrame;
+		lastFrame = currentFrame;
+
+		/* Check and call events */
+		glfwPollEvents();
+		doMovement(deltaTime);
+
+		/* Rendering commands here*/
+		glClearColor(0.2f, 0.3f, 0.3f, 1.0f);
+		glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+
+		/* Bind textures */
+		glActiveTexture(GL_TEXTURE0);
+		shader->use();
+
+		/* Camera/View transformation */
+		glm::mat4 model;
+		model = glm::translate(model, glm::vec3(0.0f, -0.3f, 0.0f));
+		model = glm::rotate(model, glm::radians(-90.0f), glm::vec3(1.0f, 0.0f, 0.0f));
+
+		glm::mat4 view;
+		// NOTE(doyle): Lookat generates the matrix for camera coordinate axis
+		view = glm::lookAt(cameraPos, cameraPos + cameraFront, cameraUp);
+
+		/* Projection */
+		glm::mat4 projection;
+		f32 aspectRatio = static_cast<f32>(frameBufferSize.x) /
+		                  static_cast<f32>(frameBufferSize.y);
+		projection = glm::perspective(fov, aspectRatio, 0.1f, 100.0f);
+
+		/* Get shader uniform locations */
+		GLuint modelLoc = glGetUniformLocation(shader->mProgram, "model");
+		GLuint viewLoc  = glGetUniformLocation(shader->mProgram, "view");
+		GLuint projectionLoc =
+		    glGetUniformLocation(shader->mProgram, "projection");
+
+		/* Pass matrices to the shader */
+		glUniformMatrix4fv(modelLoc, 1, GL_FALSE, glm::value_ptr(model));
+		glUniformMatrix4fv(viewLoc, 1, GL_FALSE, glm::value_ptr(view));
+		glUniformMatrix4fv(projectionLoc, 1, GL_FALSE, glm::value_ptr(projection));
+
+		glBindVertexArray(vao);
+
+		glBindTexture(GL_TEXTURE_2D, containerTex->mId);
+		glUniform1i(glGetUniformLocation(shader->mProgram, "ourTexture"), 0);
+		glDrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_INT, 0);
+
+		glBindTexture(GL_TEXTURE_2D, wallTex->mId);
+		glUniform1i(glGetUniformLocation(shader->mProgram, "ourTexture"), 0);
+		glDrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_INT, (GLvoid *)&sceneVertex[4]);
+
+		glBindVertexArray(0);
+
+		/* Swap the buffers */
+		glfwSwapBuffers(window);
+	}
+
+	glDeleteVertexArrays(1, &vao);
+	glDeleteBuffers(1, &vbo);
+#if 0
+	glDeleteBuffers(1, &ebo);
+#endif
+
+	glfwTerminate();
+	return 0;
+}
+#endif

src/dengine.cpp

@@ -1,8 +1,11 @@
+#if 1
 #include <Dengine/OpenGL.h>
 #include <Dengine/Common.h>
 #include <Dengine/Shader.h>
 #include <Dengine/AssetManager.h>
 
+#include <Breakout/Game.h>
+
 #include <glm/glm.hpp>
 #include <glm/gtc/matrix_transform.hpp>
 #include <glm/gtc/type_ptr.hpp>
@@ -12,120 +15,32 @@
 #include <fstream>
 #include <string>
 
-glm::vec3 cameraPos   = glm::vec3(0.0f, 0.0f, 3.0f);
-glm::vec3 cameraFront = glm::vec3(0.0f, 0.0f, -1.0f);
-glm::vec3 cameraUp    = glm::vec3(0.0f, 1.0f, 0.0f);
-
-f32 lastX = 400;
-f32 lastY = 300;
-f32 yaw   = -90.0f;
-f32 pitch = 0.0f;
-f32 fov   = 45.0f;
-b32 firstMouse;
-
-b32 keys[1024];
-
-enum BytesPerPixel
-{
-	Greyscale      = 1,
-	GreyscaleAlpha = 2,
-	RGB            = 3,
-	RGBA           = 4,
-};
-
-INTERNAL GLint getGLFormat(BytesPerPixel bytesPerPixel, b32 srgb)
-{
-	switch (bytesPerPixel)
-	{
-		case Greyscale:
-			return GL_LUMINANCE;
-		case GreyscaleAlpha:
-			return GL_LUMINANCE_ALPHA;
-		case RGB:
-			return (srgb ? GL_SRGB : GL_RGB);
-		case RGBA:
-			return (srgb ? GL_SRGB_ALPHA : GL_RGBA);
-		default:
-			// TODO(doyle): Invalid
-		    std::cout << "getGLFormat() invalid bytesPerPixel: "
-		              << bytesPerPixel << std::endl;
-		    return GL_LUMINANCE;
-	}
-}
-
-void doMovement(f32 deltaTime)
-{
-	f32 cameraSpeed = 5.00f * deltaTime;
-	if (keys[GLFW_KEY_W])
-		cameraPos += (cameraSpeed * cameraFront);
-	if (keys[GLFW_KEY_S])
-		cameraPos -= (cameraSpeed * cameraFront);
-	if (keys[GLFW_KEY_A])
-		cameraPos -=
-		    glm::normalize(glm::cross(cameraFront, cameraUp)) * cameraSpeed;
-	if (keys[GLFW_KEY_D])
-		cameraPos +=
-		    glm::normalize(glm::cross(cameraFront, cameraUp)) * cameraSpeed;
-}
-
 void key_callback(GLFWwindow *window, int key, int scancode, int action,
                   int mode)
 {
+	Breakout::Game *game =
+	    static_cast<Breakout::Game *>(glfwGetWindowUserPointer(window));
+
 	if (key == GLFW_KEY_ESCAPE && action == GLFW_PRESS)
 	{
 		glfwSetWindowShouldClose(window, GL_TRUE);
 	}
 
-	if (key >= 0 && key < 1024)
+	if (key >= 0 && key < Breakout::NUM_KEYS)
 	{
 		if (action == GLFW_PRESS)
-			keys[key] = TRUE;
+			game->keys[key] = TRUE;
 		else if (action == GLFW_RELEASE)
-			keys[key] = FALSE;
+			game->keys[key] = FALSE;
 	}
 }
 
 void mouse_callback(GLFWwindow *window, double xPos, double yPos)
 {
-	if (firstMouse)
-	{
-		lastX = (f32)xPos;
-		lastY = (f32)yPos;
-		firstMouse = false;
-	}
-
-	f32 xOffset = (f32)xPos - lastX;
-	f32 yOffset = lastY - (f32)yPos;
-	lastX = (f32)xPos;
-	lastY = (f32)yPos;
-
-	f32 sensitivity = 0.05f;
-	xOffset *= sensitivity;
-	yOffset *= sensitivity;
-
-	yaw   += xOffset;
-	pitch += yOffset;
-
-	if (pitch > 89.0f)
-		pitch = 89.0f;
-	else if (pitch < -89.0f)
-		pitch = -89.0f;
-
-	glm::vec3 front;
-	front.x     = cos(glm::radians(pitch)) * cos(glm::radians(yaw));
-	front.y     = sin(glm::radians(pitch));
-	front.z     = cos(glm::radians(pitch)) * sin(glm::radians(yaw));
-	cameraFront = glm::normalize(front);
 }
 
 void scroll_callback(GLFWwindow *window, double xOffset, double yOffset)
 {
-	if (fov >= 1.0f && fov <= 45.0f)
-		fov -= (f32)yOffset;
-	else if (fov <= 1.0f)
-		fov = 1.0f;
-	else // fov >= 45.0f
-		fov = 45.0f;
 }
 
 GLenum glCheckError_(const char *file, int line)
@@ -172,12 +87,15 @@ int main()
 	glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
 	glfwWindowHint(GLFW_RESIZABLE, GL_FALSE);
 
-	GLFWwindow *window =
+	glm::ivec2 windowSize = glm::ivec2(800, 600);
-	    glfwCreateWindow(800, 600, "LearnOpenGL", nullptr, nullptr);
+
+	GLFWwindow *window = glfwCreateWindow(windowSize.x, windowSize.y,
+	                                      "Breakout", nullptr, nullptr);
 
 	if (!window)
 	{
-		std::cout << "glfwCreateWindow() failed: Failed to create window" << std::endl;
+		std::cout << "glfwCreateWindow() failed: Failed to create window"
+		          << std::endl;
 		glfwTerminate();
 		return -1;
 	}
@@ -192,21 +110,28 @@ int main()
 		          << std::endl;
 		return -1;
 	}
+	// NOTE(doyle): glewInit() bug that sets the gl error flag after init
+	// regardless of success. Catch it once by calling glGetError
+	glGetError();
 
-	i32 screenWidth, screenHeight;
+	glm::ivec2 frameBufferSize;
-	glfwGetFramebufferSize(window, &screenWidth, &screenHeight);
+	glfwGetFramebufferSize(window, &frameBufferSize.x, &frameBufferSize.y);
-	glViewport(0, 0, screenWidth, screenHeight);
+	glViewport(0, 0, frameBufferSize.x, frameBufferSize.y);
 
 	glfwSetKeyCallback(window, key_callback);
 	glfwSetCursorPosCallback(window, mouse_callback);
 	glfwSetScrollCallback(window, scroll_callback);
 
 	glfwSetInputMode(window, GLFW_CURSOR, GLFW_CURSOR_DISABLED);
-	firstMouse = TRUE;
+	glEnable(GL_CULL_FACE | GL_BLEND);
+	glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
+	glCullFace(GL_BACK);
 
-	glEnable(GL_DEPTH_TEST);
+	Breakout::Game game = Breakout::Game(frameBufferSize.x, frameBufferSize.y);
+	glfwSetWindowUserPointer(window, static_cast<void *>(&game));
+	game.init();
 
-	/* Initialise shaders */
+	    /* Initialise shaders */
 	Dengine::AssetManager assetManager;
 	i32 result = 0;
 
@@ -220,64 +145,14 @@ int main()
 	                                       "container");
 	if (result) return result;
 
+	result = assetManager.loadTextureImage("data/textures/wall.jpg",
+	                                       "wall");
+	if (result) return result;
+
 	Dengine::Texture *containerTex = assetManager.getTexture("container");
+	Dengine::Texture *wallTex = assetManager.getTexture("wall");
 	Dengine::Shader *shader = assetManager.getShader("default");
 
-	/* Create OGL Vertex objects */
-	GLfloat vertices[] = {
-		// Positions          Colors             Texture Coords
-		+0.5f, +0.5f, +0.0f,  1.0f, 0.0f, 0.0f,  1.0f, 1.0f, // Top Right
-		+0.5f, -0.5f, +0.0f,  0.0f, 1.0f, 0.0f,  1.0f, 0.0f, // Bottom Right
-		-0.5f, -0.5f, +0.0f,  0.0f, 0.0f, 1.0f,  0.0f, 0.0f, // Bottom left
-		-0.5f, +0.5f, +0.0f,  1.0f, 1.0f, 0.0f,  0.0f, 1.0f, // Top left
-	};
-
-	GLuint indices[] = {
-	    0, 1, 3, // First triangle
-	    1, 2, 3, // First triangle
-	};
-
-	GLuint vbo, vao;
-	glGenVertexArrays(1, &vao);
-	glGenBuffers(1, &vbo);
-	GLuint ebo;
-	glGenBuffers(1, &ebo);
-
-	// 1. Bind vertex array object
-	glBindVertexArray(vao);
-
-	// 2. Bind and set vertex buffer(s) and attribute pointer(s)
-	glBindBuffer(GL_ARRAY_BUFFER, vbo);
-	glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW);
-
-	glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, ebo);
-	glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(indices), indices, GL_STATIC_DRAW);
-
-	const i32 numPos      = 3;
-	const i32 numColors   = 3;
-	const i32 numTexCoord = 2;
-
-	const GLint vertexSize =
-	    (numPos + numColors + numTexCoord) * sizeof(GLfloat);
-
-	const GLint vertByteOffset     = 0;
-	const GLint colorByteOffset    = vertByteOffset + (numPos * sizeof(GLfloat));
-	const GLint texCoordByteOffset = colorByteOffset + (numColors * sizeof(GLfloat));
-
-	glVertexAttribPointer(0, numPos, GL_FLOAT, GL_FALSE, vertexSize,
-	                      (GLvoid *)vertByteOffset);
-	glEnableVertexAttribArray(0);
-	glVertexAttribPointer(1, numColors, GL_FLOAT, GL_FALSE, vertexSize,
-	                      (GLvoid *)colorByteOffset);
-	glEnableVertexAttribArray(1);
-	glVertexAttribPointer(2, numTexCoord, GL_FLOAT, GL_FALSE, vertexSize,
-	                      (GLvoid *)texCoordByteOffset);
-	glEnableVertexAttribArray(2);
-
-	// 4. Unbind to prevent mistakes
-	glBindBuffer(GL_ARRAY_BUFFER, 0);
-	glBindVertexArray(0);
-
 	f32 deltaTime = 0.0f; // Time between current frame and last frame
 	f32 lastFrame = 0.0f; // Time of last frame
 
@@ -290,56 +165,25 @@ int main()
 
 		/* Check and call events */
 		glfwPollEvents();
-		doMovement(deltaTime);
+
+		game.processInput(deltaTime);
+		game.update(deltaTime);
 
 		/* Rendering commands here*/
 		glClearColor(0.2f, 0.3f, 0.3f, 1.0f);
 		glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 
-		/* Bind textures */
-		glActiveTexture(GL_TEXTURE0);
-		glBindTexture(GL_TEXTURE_2D, containerTex->mId);
-		glUniform1i(glGetUniformLocation(shader->mProgram, "ourTexture"), 0);
-
 		shader->use();
-
+		game.render();
-		/* Camera/View transformation */
-		glm::mat4 model;
-		glm::mat4 view;
-		// NOTE(doyle): Lookat generates the matrix for camera coordinate axis
-		view = glm::lookAt(cameraPos, cameraPos + cameraFront, cameraUp);
-
-		/* Projection */
-		glm::mat4 projection;
-		projection = glm::perspective(fov,
-		                              ((f32)screenWidth / (f32)screenHeight),
-		                              0.1f, 100.0f);
-
-		/* Get shader uniform locations */
-		GLuint modelLoc = glGetUniformLocation(shader->mProgram, "model");
-		GLuint viewLoc  = glGetUniformLocation(shader->mProgram, "view");
-		GLuint projectionLoc =
-		    glGetUniformLocation(shader->mProgram, "projection");
-
-		/* Pass matrices to the shader */
-		glUniformMatrix4fv(modelLoc, 1, GL_FALSE, glm::value_ptr(model));
-		glUniformMatrix4fv(viewLoc, 1, GL_FALSE, glm::value_ptr(view));
-		glUniformMatrix4fv(projectionLoc, 1, GL_FALSE, glm::value_ptr(projection));
-
-		glBindVertexArray(vao);
-		glDrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_INT, 0);
-		glBindVertexArray(0);
 
 		/* Swap the buffers */
 		glfwSwapBuffers(window);
 	}
 
-	glDeleteVertexArrays(1, &vao);
-	glDeleteBuffers(1, &vbo);
-#if 0
-	glDeleteBuffers(1, &ebo);
-#endif
-
 	glfwTerminate();
 	return 0;
 }
+
+#else
+#include <Tutorial.cpp>
+#endif

src/include/Breakout/Game.h

@@ -0,0 +1,37 @@
+#ifndef BREAKOUT_GAME_H
+#define BREAKOUT_GAME_H
+
+#include <Dengine\OpenGL.h>
+#include <Dengine\Common.h>
+
+namespace Breakout
+{
+
+GLOBAL_VAR const i32 NUM_KEYS = 1024;
+
+enum GameState
+{
+	GAME_ACTIVE,
+	GAME_MENU,
+	GAME_WIN
+};
+
+class Game
+{
+public:
+	GameState mState;
+	GLboolean keys[NUM_KEYS];
+	i32 width, height;
+
+	Game(i32 width, i32 height);
+	~Game();
+
+	void init();
+
+	void processInput(f32 dt);
+	void update(f32 dt);
+	void render();
+};
+}
+
+#endif

src/include/Dengine/AssetManager.h

@@ -15,6 +15,7 @@ class AssetManager
 {
 public:
 	AssetManager();
+	// TODO(doyle): Unload all resources in memory
 	~AssetManager();
 
 	/* Texture */