Added example projects from lecture

10 files changed, 584 insertions, 0 deletions

diff --git a/dev/angry-vectors/.gitignore b/dev/angry-vectors/.gitignore
new file mode 100644
index 0000000..dd1a9a8
--- /dev/null
+++ b/dev/angry-vectors/.gitignore
@@ -0,0 +1,2 @@
+config.h
+build
diff --git a/dev/angry-vectors/CMakeLists.txt b/dev/angry-vectors/CMakeLists.txt
new file mode 100644
index 0000000..a8bb5c0
--- /dev/null
+++ b/dev/angry-vectors/CMakeLists.txt
@@ -0,0 +1,183 @@
+# Original Author(s) of this File: 
+#   Daniel Keefe, 2017, University of Minnesota
+#  
+# Author(s) of Significant Updates/Modifications to the File:
+#   ... 
+
+
+
+# You are encouraged to copy this example, move it outside of the MinGfx directory, and use
+# it as a starting point for your project.  When you do this, you'll have to edit the
+# following line as needed to point to the MinGfx install prefix used on your system.
+
+# !!!!!!!!!!!!! EDIT THE FOLLOWING LINE AS NEEDED !!!!!!!!!!!!! 
+list(APPEND CMAKE_PREFIX_PATH ${CMAKE_CURRENT_SOURCE_DIR}/../build/install ../..)
+
+
+#### BASIC PROJECT SETUP ####
+
+project(angry-vectors)
+
+# Using 3.9 to get a modern version of FindOpenGL.cmake
+cmake_minimum_required (VERSION 3.9) 
+
+# Dependencies that are auto-downloaded, built, and installed for you will go in the 
+# directory pointed to by the CMAKE_INSTALL_PREFIX.  It defaults to a location inside
+# the build directory.
+if (CMAKE_INSTALL_PREFIX_INITIALIZED_TO_DEFAULT OR "${CMAKE_INSTALL_PREFIX}" STREQUAL "")
+    set (CMAKE_INSTALL_PREFIX "${CMAKE_BINARY_DIR}/install" CACHE PATH "default install path" FORCE )
+endif()
+
+# Add to paths cmake uses to search for scripts, modules, and config packages
+list(APPEND CMAKE_MODULE_PATH ${CMAKE_CURRENT_SOURCE_DIR}/cmake ${CMAKE_INSTALL_PREFIX})
+list(INSERT CMAKE_PREFIX_PATH 0 ${CMAKE_INSTALL_PREFIX})
+
+include(MessageMacros)
+h1("Building ${PROJECT_NAME}")
+h2("Configuring paths")
+
+message(STATUS "Module path: ${CMAKE_MODULE_PATH}")
+message(STATUS "Prefix path: ${CMAKE_PREFIX_PATH}")
+message(STATUS "Install prefix: ${CMAKE_INSTALL_PREFIX}")
+
+set(DATA_DIR_BUILD ${CMAKE_CURRENT_SOURCE_DIR}/data)
+set(DATA_DIR_INSTALL ${CMAKE_INSTALL_PREFIX}/share/${PROJECT_NAME}/data)
+
+message(STATUS "Data dir (in build tree): ${DATA_DIR_BUILD}")
+message(STATUS "Data dir (in install tree): ${DATA_DIR_INSTALL}")
+
+set(SHADERS_DIR_BUILD ${CMAKE_CURRENT_SOURCE_DIR}/shaders)
+set(SHADERS_DIR_INSTALL ${CMAKE_INSTALL_PREFIX}/share/${PROJECT_NAME}/shaders)
+
+message(STATUS "Shaders dir (in build tree): ${SHADERS_DIR_BUILD}")
+message(STATUS "Shaders dir (in install tree): ${SHADERS_DIR_INSTALL}")
+
+
+#### SOURCE FOR THIS PROJECT ####
+h2("Configuring source files")
+
+set(SOURCEFILES
+    angry_vectors.cc
+    main.cc
+)
+
+set(HEADERFILES
+    angry_vectors.h
+)
+
+set(EXTRAFILES
+    README.md
+)
+
+set(SHADERFILES
+)
+
+set_source_files_properties(${EXTRAFILES} PROPERTIES HEADER_FILE_ONLY TRUE)
+set_source_files_properties(${SHADERFILES} PROPERTIES HEADER_FILE_ONLY TRUE)
+
+source_group("Shaders" FILES ${SHADERFILES})
+
+
+#### COMPILE OPTIONS ####
+
+h2("Configuring Compiler Options")
+
+
+message(STATUS "Building for " ${CMAKE_SYSTEM_NAME} ".")
+
+# Linux specific
+if (${CMAKE_SYSTEM_NAME} MATCHES "Linux")
+  add_definitions(-DLINUX)
+  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fPIC")
+  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++14")
+endif()
+
+
+# Apple specific
+if (${CMAKE_SYSTEM_NAME} MATCHES "Darwin")
+  add_definitions(-DOSX)
+
+  # RPATH settings, see https://cmake.org/Wiki/CMake_RPATH_handling
+  set(CMAKE_MACOSX_RPATH ON)
+
+  # use, i.e. don't skip the full RPATH for the build tree
+  SET(CMAKE_SKIP_BUILD_RPATH  FALSE)
+
+  # when building, don't use the install RPATH already
+  # (but later on when installing)
+  SET(CMAKE_BUILD_WITH_INSTALL_RPATH FALSE) 
+
+  SET(CMAKE_INSTALL_RPATH "${CMAKE_INSTALL_PREFIX}/lib")
+
+  # add the automatically determined parts of the RPATH
+  # which point to directories outside the build tree to the install RPATH
+  SET(CMAKE_INSTALL_RPATH_USE_LINK_PATH TRUE)
+
+  # the RPATH to be used when installing, but only if it's not a system directory
+  LIST(FIND CMAKE_PLATFORM_IMPLICIT_LINK_DIRECTORIES "${CMAKE_INSTALL_PREFIX}/lib" isSystemDir)
+  IF("${isSystemDir}" STREQUAL "-1")
+     SET(CMAKE_INSTALL_RPATH "${CMAKE_INSTALL_PREFIX}/lib")
+  ENDIF("${isSystemDir}" STREQUAL "-1")
+
+  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++14")
+endif()
+
+
+# Windows specific
+if (WIN32)
+  add_definitions(-DWIN32)
+
+  if(NOT CMAKE_SIZEOF_VOID_P EQUAL 8)
+    message(FATAL_ERROR
+        "You must use the 64 bit version of the compiler. Be sure to set the correct generator when configuring through CMake.")
+  endif()
+endif()
+
+
+
+
+#### DEFINE TARGET(S) ####
+
+h2("Defining Target(s)")
+
+add_executable(${PROJECT_NAME} ${SOURCEFILES} ${HEADERFILES} ${EXTRAFILES} ${SHADERFILES})
+
+
+
+#### FIND AND ADD DEPENDENCIES ####
+
+h2("Adding Dependencies")
+set(EXTERNAL_DIR external)
+
+
+# MinGfx (linked with an imported cmake target so no need to specify include dirs)
+# This will try to find MinGfxConfig.cmake, which should have been installed under
+# CMAKE_INSTALL_PREFIX/lib/cmake/MinGfx when you installed the MinGfx Toolkit.
+find_package(MinGfx REQUIRED)
+target_link_libraries(${PROJECT_NAME} PUBLIC MinGfx::MinGfx)
+
+
+# Add dependency on OpenGL
+include(UseOpenGL)
+UseOpenGL(${PROJECT_NAME} PUBLIC ${EXTERNAL_DIR})
+
+
+
+#### INSTALL TARGET(S) ####
+
+h2("Configuring Install Target")
+
+# The install locations are relative to the CMAKE_INSTALL_PREFIX variable
+install(TARGETS ${PROJECT_NAME} RUNTIME DESTINATION bin)
+
+install(
+    DIRECTORY data/
+    DESTINATION ${DATA_DIR_INSTALL}
+    OPTIONAL
+)
+
+install(
+    DIRECTORY shaders/
+    DESTINATION ${SHADERS_DIR_INSTALL}
+    OPTIONAL
+)
diff --git a/dev/angry-vectors/README.md b/dev/angry-vectors/README.md
new file mode 100644
index 0000000..ee42984
--- /dev/null
+++ b/dev/angry-vectors/README.md
@@ -0,0 +1 @@
+# Angry Vectors CSci-4611 In-Class Example of Visual Debugging
diff --git a/dev/angry-vectors/angry_vectors.cc b/dev/angry-vectors/angry_vectors.cc
new file mode 100644
index 0000000..9ca7445
--- /dev/null
+++ b/dev/angry-vectors/angry_vectors.cc
@@ -0,0 +1,125 @@
+/** CSci-4611 In-Class Example */
+
+#include "angry_vectors.h"
+
+#include <iostream>
+#include <sstream>
+
+
+
+AngryVectors::AngryVectors() : GraphicsApp(1024,768, "AngryVectors"), time_(0.0), playing_(true), pauseBtn_(NULL) {
+}
+
+
+
+AngryVectors::~AngryVectors() {
+}
+
+
+
+void AngryVectors::OnPauseBtnPressed() {
+    playing_ = !playing_;
+    if (playing_) {
+        pauseBtn_->setCaption("Pause");
+    }
+    else {
+        pauseBtn_->setCaption("Play");
+    }
+}
+
+
+Point3 AngryVectors::CalcBirdPos(double t) {
+    // projectile motion for the "bird"
+    double e = t / 4.0;
+    double x = e * 52.0 - 30.0;
+    double y = 30.0 * (-e * e + 1.2 * e) + 5.0;
+    double z = -35.0;
+    return Point3((float)x, (float)y, (float)z);
+}
+
+Vector3 AngryVectors::CalcBirdVel(double t) {
+    return CalcBirdPos(time_+0.1) - CalcBirdPos(time_);
+}
+
+
+void AngryVectors::UpdateSimulation(double dt)  {
+    if (playing_) {
+        time_ += (float)dt;
+        if (time_ > 4) {
+            time_ = 0.0;
+        }
+    }
+}
+
+
+
+void AngryVectors::InitNanoGUI() {
+    // Setup the GUI window
+    nanogui::Window *window = new nanogui::Window(screen(), "Controls");
+    window->setPosition(Eigen::Vector2i(10, 10));
+    window->setSize(Eigen::Vector2i(400,200));
+    window->setLayout(new nanogui::GroupLayout());
+    
+    pauseBtn_ = new nanogui::Button(window, "Pause");
+    pauseBtn_->setCallback(std::bind(&AngryVectors::OnPauseBtnPressed, this));
+    pauseBtn_->setTooltip("Toggle playback.");
+    
+    screen()->performLayout();
+}
+
+
+
+void AngryVectors::InitOpenGL() {
+    // Set up the camera in a good position to see the entire scene
+    proj_matrix_ = Matrix4::Perspective(60.0f, aspect_ratio(), 0.01f, 100.0f);
+    view_matrix_ = Matrix4::LookAt(Point3(0,2,15), Point3(0,0,0), Vector3(0,1,0));
+    glClearColor(0.2f, 0.6f, 1.0f, 1.0f);
+}
+
+
+void AngryVectors::DrawUsingOpenGL() {
+    // ground
+    Matrix4 ground_matrix = Matrix4::Translation(Vector3(0,-2,-50)) * Matrix4::Scale(Vector3(80, 2, 100));
+    quick_shapes_.DrawCube(ground_matrix, view_matrix_, proj_matrix_, Color(0.3f, 0.9f, 0.4f));
+  
+    // 3 targets
+    Matrix4 target1_matrix = Matrix4::Translation(Vector3(21, 6, -35)) * Matrix4::Scale(Vector3(1.5, 6, 10));
+    quick_shapes_.DrawCube(target1_matrix, view_matrix_, proj_matrix_, Color(0.6f, 0.4f, 0.2f));
+
+    Matrix4 target2_matrix = Matrix4::Translation(Vector3(25, 6, -35)) * Matrix4::Scale(Vector3(1.5, 6, 10));
+    quick_shapes_.DrawCube(target2_matrix, view_matrix_, proj_matrix_, Color(0.6f, 0.4f, 0.2f));
+
+    Matrix4 target3_matrix = Matrix4::Translation(Vector3(23, 18, -35)) * Matrix4::Scale(Vector3(1.5, 6, 10));
+    quick_shapes_.DrawCube(target3_matrix, view_matrix_, proj_matrix_, Color(0.6f, 0.4f, 0.2f));
+
+    // launcher
+    Matrix4 launcher_matrix;
+    quick_shapes_.DrawLineSegment(launcher_matrix, view_matrix_, proj_matrix_, Color(0,0,0),
+                                  Point3(-30,-2,-35), Point3(-30, 5, -35), 0.75);
+    
+    // bird
+    Point3 bird_pos = CalcBirdPos(time_);
+    Matrix4 bird_matrix = Matrix4::Translation(bird_pos - Point3::Origin());
+    quick_shapes_.DrawSphere(bird_matrix, view_matrix_, proj_matrix_, Color(1,0,0));
+    
+    
+    
+    // DEBUGGING OUTPUT
+    
+    // this is useful to be able to see where the origin is and the scale.  The
+    // axes are drawn at (0,0,0), and each arrow is 1 unit long.  The red axis is X,
+    // green is Y, and blue is Z.
+    Matrix4 identity;
+    quick_shapes_.DrawAxes(identity, view_matrix_, proj_matrix_);
+    
+    
+    // TODO: make sure bird velocity makes sense. (hint, hint)
+
+   
+
+}
+
+
+
+
+
diff --git a/dev/angry-vectors/angry_vectors.h b/dev/angry-vectors/angry_vectors.h
new file mode 100644
index 0000000..37ad578
--- /dev/null
+++ b/dev/angry-vectors/angry_vectors.h
@@ -0,0 +1,71 @@
+/** CSci-4611 In-Class Example */
+
+#ifndef ANGRY_VECTORS_H_
+#define ANGRY_VECTORS_H_
+
+#include <mingfx.h>
+using namespace mingfx;
+
+#include <string>
+#include <vector>
+
+class AngryVectors : public GraphicsApp {
+public:
+  
+    // Creates the App
+    AngryVectors();
+    
+    // Cleans up when the App shuts down
+    virtual ~AngryVectors();
+    
+    // Note a Run() function is inherited from GraphicsApp, that's what
+    // actually starts up the App.
+    
+    // This is a callback, a function that gets called when the user presses
+    // the Pause button in the GUI.
+    void OnPauseBtnPressed();
+    
+    // This calculates the bird position given a time value.
+    Point3 CalcBirdPos(double time);
+
+    // This calculates the bird velocity given a time value, this is the routine
+    // we want to check to make sure it is working properly
+    Vector3 CalcBirdVel(double time);
+    
+    // This gets called once each frame.  Note that dt (a.k.a., "delta time") is
+    // the amount of time (in seconds) that has passed since the last frame.
+    void UpdateSimulation(double dt);
+    
+    // This is where we initialize the on-screen GUI, which is implemented using
+    // an open source library called NanoGUI.  It gets called once
+    // when the program starts up.
+    void InitNanoGUI();
+    
+    // This is where we initialize any OpenGL data, like textures or meshes that
+    // need to be loaded from files and setup in OpenGL.  It gets called once
+    // when the program starts up.
+    void InitOpenGL();
+    
+    // This gets called once each frame, and this is where you draw the latest
+    // version of your 3D graphics scene.
+    void DrawUsingOpenGL();
+    
+    
+private:    
+    
+    // Time of flight for our "bird"
+    float time_;
+    
+    // Sets up the computer graphics camera
+    Matrix4 view_matrix_;
+    Matrix4 proj_matrix_;
+    
+    // A helper class for drawing some simple shapes (cubes, spheres, 3D arrows)
+    QuickShapes quick_shapes_;
+    
+    // Gui elements
+    nanogui::Button  *pauseBtn_;
+    bool playing_;
+};
+
+#endif
\ No newline at end of file
diff --git a/dev/angry-vectors/cmake/DownloadHelper.txt.in b/dev/angry-vectors/cmake/DownloadHelper.txt.in
new file mode 100644
index 0000000..fb29bff
--- /dev/null
+++ b/dev/angry-vectors/cmake/DownloadHelper.txt.in
@@ -0,0 +1,26 @@
+# This file is part of the MinGfx cmake build system.  
+# See the main MinGfx/CMakeLists.txt file for authors, copyright, and license info.
+
+# This is a "helper" cmake project -- the only thing this project does is download
+# the external project.  So, the configure, build, install, and test commands for 
+# ExternalProject_Add() are intentionally set as NOPs.  
+
+cmake_minimum_required (VERSION 3.9) 
+
+project(@EXT_PROJECT_NAME@-download)
+
+include(ExternalProject)
+ExternalProject_Add(
+  @EXT_PROJECT_NAME@
+  SOURCE_DIR "@DOWNLOAD_DIR@/@EXT_PROJECT_NAME@/src"
+  BINARY_DIR "@DOWNLOAD_DIR@/@EXT_PROJECT_NAME@/download-helper"
+  @DOWNLOAD_OPTIONS@
+  CONFIGURE_COMMAND ""
+  BUILD_COMMAND ""
+  INSTALL_COMMAND ""
+  TEST_COMMAND ""
+  LOG_DOWNLOAD ON
+  GIT_PROGRESS 1
+)
+
+
diff --git a/dev/angry-vectors/cmake/ExternalProjectDownloadBuildInstall.cmake b/dev/angry-vectors/cmake/ExternalProjectDownloadBuildInstall.cmake
new file mode 100644
index 0000000..ce12d1d
--- /dev/null
+++ b/dev/angry-vectors/cmake/ExternalProjectDownloadBuildInstall.cmake
@@ -0,0 +1,98 @@
+# This file is part of the MinGfx cmake build system.  
+# See the main MinGfx/CMakeLists.txt file for authors, copyright, and license info.
+
+
+# Calling CMAKE_CURRENT_LIST_DIR inside a function returns the list dir of the calling script
+# but we want the list dir of this file in order to find the DownloadHelper.txt.in file, which
+# should be stored right next to this one.  So, defining this variable outside the scope of the
+# functions below.
+set(DIR_OF_THIS_FILE ${CMAKE_CURRENT_LIST_DIR})  
+
+
+
+# Usage:  
+# ExternalProject_Download(
+#     # This first argument is the name of the project to download.  It is required:
+#     glm
+#
+#     # Additional arguments specify how to download the project using GIT, SVN, CVS, or URL.
+#     # These can be any of the arguments used for the downloading step of the cmake builtin
+#     # ExternalProject_Add command. 
+#     GIT_REPOSITORY "https://github.com/g-truc/glm.git"
+#     GIT_TAG master
+#     etc..
+# )
+function(ExternalProject_Download EXT_PROJECT_NAME DOWNLOAD_DIR)
+
+    include(MessageMacros)
+    h1("BEGIN EXTERNAL PROJECT DOWNLOAD (${EXT_PROJECT_NAME}).")
+
+    h2("Creating a download helper project for ${EXT_PROJECT_NAME}.")
+
+    set(DOWNLOAD_OPTIONS ${ARGN})
+    string (REGEX REPLACE "(^|[^\\\\]);" "\\1 " DOWNLOAD_OPTIONS "${DOWNLOAD_OPTIONS}")
+
+
+    file(MAKE_DIRECTORY ${DOWNLOAD_DIR}/${EXT_PROJECT_NAME})
+    configure_file(
+        ${DIR_OF_THIS_FILE}/DownloadHelper.txt.in 
+        ${DOWNLOAD_DIR}/${EXT_PROJECT_NAME}/download-helper/CMakeLists.txt
+    )
+
+    h2("Generating build files for the ${EXT_PROJECT_NAME} download helper project.")
+    execute_process(COMMAND "${CMAKE_COMMAND}" -G "${CMAKE_GENERATOR}" . WORKING_DIRECTORY "${DOWNLOAD_DIR}/${EXT_PROJECT_NAME}/download-helper")
+
+    h2("Building the ${EXT_PROJECT_NAME} download helper project.  (This actually performs the download and may take some time...)")
+    execute_process(COMMAND "${CMAKE_COMMAND}" --build . WORKING_DIRECTORY "${DOWNLOAD_DIR}/${EXT_PROJECT_NAME}/download-helper")
+
+    h2("Completed download of external project ${EXT_PROJECT_NAME}.")
+
+endfunction()
+
+
+# Usage:  
+# ExternalProject_BuildAndInstallNow(
+#     # This first argument is the name of the external project to download.  It is required:
+#     VRPN
+#     # This second argument is the relative path from ${EXTERNAL_DIR_NAME}/projectname/ to the project's
+#     # main CMakeLists.txt file:
+#     src
+#
+#     # Additional arguments are passed on as options to the cmake build file generator
+#     -DVRPN_BUILD_DIRECTSHOW_VIDEO_SERVER=OFF
+#     -DVRPN_BUILD_HID_GUI=OFF
+#     etc..
+# )
+function(ExternalProject_BuildAndInstallNow EXT_PROJECT_NAME DOWNLOAD_DIR RELPATH_TO_CMAKELISTS)
+
+    include(MessageMacros)
+    h1("BEGIN EXTERNAL PROJECT BUILD AND INSTALL (${EXT_PROJECT_NAME}).")
+
+    # any extra args to the function are interpreted as arguments for the cmake config process
+    set(CMAKE_CONFIG_OPTIONS ${ARGN})
+
+    # always set the install prefix to be the same as for the main project
+    list(APPEND CMAKE_CONFIG_OPTIONS -DCMAKE_INSTALL_PREFIX=${CMAKE_INSTALL_PREFIX})
+
+    #string (REGEX REPLACE "(^|[^\\\\]);" "\\1 " CMAKE_CONFIG_OPTIONS "${CMAKE_CONFIG_OPTIONS}")
+
+
+    set(SRC_DIR "${DOWNLOAD_DIR}/${EXT_PROJECT_NAME}/${RELPATH_TO_CMAKELISTS}")
+    set(BUILD_DIR "${CMAKE_BINARY_DIR}/external/${EXT_PROJECT_NAME}")
+
+    file(MAKE_DIRECTORY ${BUILD_DIR})
+
+    h2("Generating build files for external project ${EXT_PROJECT_NAME}.")
+    message(STATUS "Using source dir: ${SRC_DIR}")
+    message(STATUS "Using build dir: ${BUILD_DIR}")
+    message(STATUS "Config options: ${CMAKE_CONFIG_OPTIONS}")
+
+    execute_process(COMMAND "${CMAKE_COMMAND}" -G "${CMAKE_GENERATOR}" ${SRC_DIR} ${CMAKE_CONFIG_OPTIONS} WORKING_DIRECTORY ${BUILD_DIR})
+
+    h2("Building external project ${EXT_PROJECT_NAME}.  (This may take some time...)")
+    execute_process(COMMAND "${CMAKE_COMMAND}" --build ${BUILD_DIR} --target install)
+
+    h2("Completed external build of ${EXT_PROJECT_NAME}.")
+
+endfunction()
+
diff --git a/dev/angry-vectors/cmake/MessageMacros.cmake b/dev/angry-vectors/cmake/MessageMacros.cmake
new file mode 100644
index 0000000..4628e5c
--- /dev/null
+++ b/dev/angry-vectors/cmake/MessageMacros.cmake
@@ -0,0 +1,17 @@
+# This file is part of the MinVR cmake build system.  
+# See the main MinVR/CMakeLists.txt file for authors, copyright, and license info.
+
+
+macro(h1 TITLE)
+  string(TOUPPER ${TITLE} TITLE)
+  message(STATUS "\n\n==== ${TITLE} ====")
+endmacro()
+
+macro(h2 TITLE)
+  message(STATUS "\n* ${TITLE}")
+endmacro()
+
+macro(h3 TITLE)
+  message(STATUS "- ${TITLE}")
+endmacro()
+
diff --git a/dev/angry-vectors/cmake/UseOpenGL.cmake b/dev/angry-vectors/cmake/UseOpenGL.cmake
new file mode 100644
index 0000000..2ec5ffb
--- /dev/null
+++ b/dev/angry-vectors/cmake/UseOpenGL.cmake
@@ -0,0 +1,52 @@
+# This file is part of the MinGfx cmake build system.  
+# See the main MinGfx/CMakeLists.txt file for authors, copyright, and license info.
+
+# Either finds a pre-installed version or complains.
+
+# Usage: In your CMakeLists.txt, somewhere after you define the target that depends
+# on the OpenGL library (typical with something like add_executable(${PROJECT_NAME} ...) 
+# or add_library(${PROJECT_NAME} ...)), add the following two lines:
+
+#    include(UseOpenGL)
+#    UseOpenGL(${PROJECT_NAME} PRIVATE ${CMAKE_CURRENT_SOURCE_DIR}/external)
+
+# The second argument can be either PUBLIC, PRIVATE, or INTERFACE, following the keyword
+# usage described here: 
+# https://cmake.org/cmake/help/latest/command/target_include_directories.html
+
+# The third argument is the directory to use for downloading the external project if
+# autobuild is used.
+
+
+
+macro(UseOpenGL YOUR_TARGET INTERFACE_PUBLIC_OR_PRIVATE DOWNLOAD_DIR)
+
+    message(STATUS "Searching for OpenGL...")
+
+	# Check to see if the library is already installed on the system    
+    # CMake ships with FindOpenGL.cmake and in CMake 3.9+ it defines
+    # the imported targets OpenGL::GL and OpenGL::GLU.  Using these is
+    # now the preferred way to link with OpenGL and all of its dependencies.
+	# See https://cmake.org/cmake/help/v3.9/module/FindOpenGL.html
+	find_package(OpenGL)
+
+	if (NOT ${OPENGL_FOUND})
+	    message(FATAL_ERROR "OpenGL was not found on the system.  MinGfx can auto-download and build many dependencies for you, but not OpenGL. It should come pre-installed on your system.")
+	endif()
+
+    message(STATUS "Ok: OpenGL Found.")
+    message(STATUS "OpenGL headers: ${OPENGL_INCLUDE_DIR}")
+    message(STATUS "OpenGL libs: ${OPENGL_LIBRARIES}")
+
+
+    message(STATUS "Linking target ${YOUR_TARGET} with ${INTERFACE_PUBLIC_OR_PRIVATE} dependency OpenGL::GL.")
+    target_link_libraries(${YOUR_TARGET} ${INTERFACE_PUBLIC_OR_PRIVATE} OpenGL::GL)
+
+    if (${OPENGL_GLU_FOUND})
+        message(STATUS "Linking target ${YOUR_TARGET} with ${INTERFACE_PUBLIC_OR_PRIVATE} dependency OpenGL::GLU.")
+        target_link_libraries(${YOUR_TARGET} ${INTERFACE_PUBLIC_OR_PRIVATE} OpenGL::GLU)
+    endif()
+
+	target_compile_definitions(${YOUR_TARGET} ${INTERFACE_PUBLIC_OR_PRIVATE} -DUSE_OPENGL)
+
+endmacro()
diff --git a/dev/angry-vectors/main.cc b/dev/angry-vectors/main.cc
new file mode 100644
index 0000000..0bacdcf
--- /dev/null
+++ b/dev/angry-vectors/main.cc
@@ -0,0 +1,9 @@
+/** CSci-4611 In-Class Example */
+
+#include "angry_vectors.h"
+
+int main(int argc, const char *argv[]) {
+    AngryVectors app;
+    app.Run();
+    return 0;
+}