From eed4eec20c0f2c9a65fd2174cbf23a69591803b3 Mon Sep 17 00:00:00 2001
From: Lauchmelder <robert.trololo@gmail.com>
Date: Mon, 20 Dec 2021 04:31:44 +0100
Subject: [PATCH] basic glfw app setup

---
 .gitignore          |  5 +++++
 .gitmodules         |  3 +++
 CMakeLists.txt      | 18 +++++++++++++++++
 src/Application.cpp | 47 +++++++++++++++++++++++++++++++++++++++++++++
 src/Application.hpp | 35 +++++++++++++++++++++++++++++++++
 src/CMakeLists.txt  |  7 +++++++
 src/main.cpp        | 21 ++++++++++++++++++++
 vendor/glfw         |  1 +
 8 files changed, 137 insertions(+)
 create mode 100644 .gitignore
 create mode 100644 .gitmodules
 create mode 100644 CMakeLists.txt
 create mode 100644 src/Application.cpp
 create mode 100644 src/Application.hpp
 create mode 100644 src/CMakeLists.txt
 create mode 100644 src/main.cpp
 create mode 160000 vendor/glfw

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..b76cd25
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,5 @@
+.vs/
+[Oo]ut/
+[Bb]uild/
+
+*.json
\ No newline at end of file
diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..2cf019a
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "vendor/glfw"]
+	path = vendor/glfw
+	url = git@github.com:glfw/glfw.git
diff --git a/CMakeLists.txt b/CMakeLists.txt
new file mode 100644
index 0000000..a709afe
--- /dev/null
+++ b/CMakeLists.txt
@@ -0,0 +1,18 @@
+# CMakeList.txt : Top-level CMake project file, do global configuration
+# and include sub-projects here.
+#
+cmake_minimum_required (VERSION 3.8)
+
+project ("Visualizer")
+
+find_package(glfw3)
+if(NOT GLFW3_FOUND)
+	message(STATUS "Could not find GLFW binaries on system, building from source instead")
+	add_subdirectory("vendor/glfw")
+
+	set(GLFW3_INCLUDE_DIRS glfw)
+	set(GLFW3_LIBRARIES glfw)
+endif()
+
+# Include sub-projects.
+add_subdirectory ("src")
diff --git a/src/Application.cpp b/src/Application.cpp
new file mode 100644
index 0000000..78323fc
--- /dev/null
+++ b/src/Application.cpp
@@ -0,0 +1,47 @@
+#include "Application.hpp"
+
+#include <stdexcept>
+#include <sstream>
+#include <GLFW/glfw3.h>
+
+Application::~Application()
+{
+	if (window != nullptr) 
+	{
+		glfwDestroyWindow(window);
+		window = nullptr;
+	}
+
+	glfwTerminate();
+}
+
+void Application::Init(int width, int height, const std::string& title)
+{
+	if(window == nullptr)
+		glfwInit();
+
+	window = glfwCreateWindow(width, height, title.c_str(), NULL, NULL);
+	if (window == nullptr)
+	{
+		const char* errorbuf;
+		int errorcode = glfwGetError(&errorbuf);
+
+		glfwTerminate();
+
+		std::stringstream errorstream;
+		errorstream << "Failed to create GLFWwindow (" << errorcode << "): \n" << errorbuf << std::endl;
+		throw std::runtime_error(errorstream.str());
+	}
+
+	glfwMakeContextCurrent(window);
+}
+
+void Application::Launch()
+{
+	while (!glfwWindowShouldClose(window))
+	{
+		glfwPollEvents();
+
+		glfwSwapBuffers(window);
+	}
+}
diff --git a/src/Application.hpp b/src/Application.hpp
new file mode 100644
index 0000000..db29f74
--- /dev/null
+++ b/src/Application.hpp
@@ -0,0 +1,35 @@
+#pragma once
+
+#include <string>
+
+struct GLFWwindow;
+
+class Application
+{
+/////////////////////////////////////////////////////////
+////// SINGLETON BOILERPLATE ////////////////////////////
+/////////////////////////////////////////////////////////
+public:
+	static Application& Instance()
+	{
+		static Application app;
+		return app;
+	}
+
+
+private:
+	Application() = default;
+	~Application();
+	Application(const Application& other) = delete;
+
+/////////////////////////////////////////////////////////
+////// APPLICATION IMPLEMENTATION ///////////////////////
+/////////////////////////////////////////////////////////
+
+public:
+	void Init(int width, int height, const std::string& title);
+	void Launch();
+
+private:
+	GLFWwindow* window = nullptr;
+};
\ No newline at end of file
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
new file mode 100644
index 0000000..cfd3eb8
--- /dev/null
+++ b/src/CMakeLists.txt
@@ -0,0 +1,7 @@
+add_executable(visualizer
+	"main.cpp" "Application.cpp"
+)
+
+target_include_directories(visualizer PUBLIC ${GLFW3_INCLUDE_DIRS})
+
+target_link_libraries(visualizer PUBLIC ${GLFW3_INCLUDE_DIRS})
\ No newline at end of file
diff --git a/src/main.cpp b/src/main.cpp
new file mode 100644
index 0000000..6b9d963
--- /dev/null
+++ b/src/main.cpp
@@ -0,0 +1,21 @@
+#include <iostream>
+#include "Application.hpp"
+
+int main(int argc, char** argv)
+{
+	Application& app = Application::Instance();
+
+	try
+	{
+		app.Init(800, 800, "Visualizer");
+	}
+	catch (const std::runtime_error& err)
+	{
+		std::cerr << "Application initialization failed\n\n" << err.what();
+		return 1;
+	}
+
+	app.Launch();
+
+	return 0;
+}
\ No newline at end of file
diff --git a/vendor/glfw b/vendor/glfw
new file mode 160000
index 0000000..6281f49
--- /dev/null
+++ b/vendor/glfw
@@ -0,0 +1 @@
+Subproject commit 6281f498c875f49d8ac5c5a02d968fb1792fd9f5