added glfw support

.gitmodules

@@ -0,0 +1,3 @@
+[submodule "deps/glfw"]
+	path = deps/glfw
+	url = https://github.com/glfw/glfw/

CMakeLists.txt

@@ -1,7 +1,12 @@
 cmake_minimum_required(VERSION 3.10)
+add_subdirectory("deps/glfw")
 project(Raycaster VERSION 0.1)
 set(CMAKE_CXX_STANDARD 11)
 set(CMAKE_CXX_STANDARD_REQUIRED True)
 add_executable(raycaster src/main.cpp)
 configure_file(src/RaycasterConfig.h.in RaycasterConfig.h)
-target_include_directories(raycaster PUBLIC "${PROJECT_BINARY_DIR}")
+target_include_directories(raycaster PUBLIC 
+                            "${PROJECT_BINARY_DIR}"
+                            "deps/glfw/include"
+                            )
+target_link_libraries(raycaster glfw)

deps/glfw

@@ -0,0 +1 @@
+Subproject commit b35641f4a3c62aa86a0b3c983d163bc0fe36026d

src/main.cpp

@@ -1,7 +1,23 @@
 #include <iostream>
 #include "RaycasterConfig.h"
+#include <GLFW/glfw3.h>
 
 int main(int argc, char *argv[]){
     std::cout << Raycaster_VERSION_MAJOR << "." << Raycaster_VERSION_MINOR << std::endl;
+    if(!glfwInit()){
+        std::cout << "GLFW Init failed" << std::endl;
+        return -1;
+    }
+    GLFWwindow* window = glfwCreateWindow(640, 480, "My Title", NULL, NULL);
+    if (!window){
+        std::cout << "GLFW Window creation failed" << std::endl;
+        return -1;
+    }
+    glfwMakeContextCurrent(window);
+    while(!glfwWindowShouldClose(window)){
+        glfwPollEvents();
+        glfwSwapBuffers(window);
+    }
+    glfwTerminate();
     return 0;
 }