From fd605024dab2c1fdb77016e1247f0c24c0e2398d Mon Sep 17 00:00:00 2001
From: ATLAS_Moon <atlasrmoon@gmail.com>
Date: Sat, 15 Aug 2020 16:27:24 +0000
Subject: [PATCH] Game window stays up until ESC is pressed

---
 include/render.hpp | 43 +++++++++++++++++++++++++------
 src/main.cpp       | 28 +++++++++++++++++++--
 src/render.cpp     | 63 +++++++++++++++++++++++++++++++++-------------
 3 files changed, 107 insertions(+), 27 deletions(-)

diff --git a/include/render.hpp b/include/render.hpp
index 23c50d3..36a9355 100644
--- a/include/render.hpp
+++ b/include/render.hpp
@@ -2,18 +2,47 @@
 #define OUR_DICK_RENDER_HPP
 
 #include <stdint.h>
+#include <GLFW/glfw3.h>
 
 #define OPENFL_VERSION 400
 #define GLSL_VERSION 400
 
-class RenderManager
-{
-public:
-	RenderManager (RenderManager&) = delete;
-	RenderManager (RenderManager&&) = delete;
+class GLFWwindow;
 
-	RenderManager();
-	bool Init(uint16_t width, uint16_t height, const char* title); // Sets up the OpenGL environment
+class render_manager
+{
+private:
+	void (*m_windowCloseCallback)(void);
+	void (*m_inputHandler)(GLFWwindow* window, int key, int scancode, int action, int mods);
+	GLFWwindow* m_mainWindow;
+
+public:
+	enum GLFW_ERROR
+	{
+		GLFW_OK,
+		GLFW_CONTEXT_ERROR,
+		GLFW_WINDOW_ERROR,
+		GLFW_INIT_ERROR,
+	};
+
+	render_manager (render_manager&) = delete;
+	render_manager (render_manager&&) = delete;
+
+	render_manager();
+	GLFW_ERROR init(int width, int height, const char* title); // Sets up the OpenGL environment
+	void update(); // Update the GL context and draw new frame
+	void request_exit();
+
+	template <typename T>
+	void handle_window_close_event(T handle){
+		m_windowCloseCallback = handle;
+	}
+
+	template <typename T>
+	void handle_keypress_event(T handle){
+		m_inputHandler = handle;
+		glfwSetKeyCallback(m_mainWindow, m_inputHandler);
+	}
 
 };
 
diff --git a/src/main.cpp b/src/main.cpp
index 6aecbc4..0bc2b8a 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -12,6 +12,14 @@
 //	---------
 //	6 | 7 | 8
 
+#define TILE_COUNT 9
+
+namespace
+{
+	bool running = true;
+	render_manager manager;
+}
+
 int get_player_input(){
 	//TODO get player input
 	return rand()%9;
@@ -77,12 +85,28 @@ int exists_empty_tile(const game_state& gs){
 	return 0;
 }
 
+void handle_window_close(){
+	printf ("[II] Window close event triggered\n");
+	running = false;
+}
+
+void handle_input_events(GLFWwindow*, int key, int, int, int)
+{
+	printf ("[II] Recieved keycode %d\n", key);
+	if (key == 256)
+		manager.request_exit ();
+}
+
 int main(){
 	srand(time(NULL));
 	game_state gs = {};
 
-	RenderManager manager;
-	manager.Init(640, 480, "Tic-Tac-Gugh");
+	manager.init(640, 480, "Tic-Tac-Gugh");
+	manager.handle_window_close_event(handle_window_close);
+	manager.handle_keypress_event (handle_input_events);
+
+	while (running)
+		manager.update();
 
 	while(exists_empty_tile(gs) && gs.turn != -1){
 		game_turn(gs, get_player_input());
diff --git a/src/render.cpp b/src/render.cpp
index ee4fd7c..78a0608 100644
--- a/src/render.cpp
+++ b/src/render.cpp
@@ -1,33 +1,60 @@
+#include <gl3w/GL/gl3w.h> // Must be included first
 #include "render.hpp"
-
-#include <gl3w/GL/gl3w.h>
-#include <GLFW/glfw3.h>
 #include <stdio.h>
 
-RenderManager::RenderManager(){}
-
-bool RenderManager::Init (uint16_t width, uint16_t height, const char* title){
-	if (!glfwInit()) {
-		printf("[EE] failed to initialize GLFW.\n");
-		return false;
+namespace
+{
+	void handle_resize_event(GLFWwindow*, int width, int height){
+		printf("Window resized\n");
+		glViewport(0, 0, width, height);
 	}
+}
+
+
+render_manager::render_manager() :
+	m_windowCloseCallback (nullptr),
+	m_inputHandler (nullptr),
+	m_mainWindow (nullptr)
+{}
+
+render_manager::GLFW_ERROR render_manager::init (int width, int height, const char* title){
+	if (!glfwInit()) {
+    fprintf(stdout, "[EE] failed to initialize GLFW.\n");
+    return GLFW_INIT_ERROR;
+  }
 
 	glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
-	glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
+  glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
 	glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
 
-	auto window = glfwCreateWindow(width, height, title, nullptr, nullptr);
-	if (!window) {
-		printf ("[EE] Could not create window\n");
-		return false;
+	m_mainWindow = glfwCreateWindow(width, height, title, nullptr, nullptr);
+	if (!m_mainWindow) {
+		fprintf (stdout, "[EE] Could not create window\n");
+		return GLFW_WINDOW_ERROR;
 	}
 
-	glfwMakeContextCurrent(window);
+	glfwMakeContextCurrent(m_mainWindow);
 	if (gl3wInit()) {
-		printf("[EE] failed to initialize OpenGL\n");
-		return false;
+		fprintf(stdout, "[EE] failed to initialize OpenGL\n");
+		return GLFW_CONTEXT_ERROR;
 	}
 
+	glViewport(0, 0, width, height);
+
 	printf("[DD] OpenGL %s, GLSL %s\n", glGetString(GL_VERSION), glGetString(GL_SHADING_LANGUAGE_VERSION));
-	return true;
+
+	glfwSetFramebufferSizeCallback(m_mainWindow, handle_resize_event);
+
+	return GLFW_OK;
+}
+
+void render_manager::update(){
+	glfwSwapBuffers(m_mainWindow);
+	glfwPollEvents();
+}
+
+void render_manager::request_exit()
+{
+	if (m_windowCloseCallback) m_windowCloseCallback();
+	glfwSetWindowShouldClose(m_mainWindow, true);
 }