[rnet] module WIP (#809)

Added experimental network module

examples/network/network_udp_client.c

@@ -0,0 +1,128 @@
+/*******************************************************************************************
+ *
+ *   raylib [network] example - UDP Client
+ *
+ *   Welcome to raylib!
+ *
+ *   To test examples, just press F6 and execute raylib_compile_execute script
+ *   Note that compiled executable is placed in the same folder as .c file
+ *
+ *   You can find all basic examples on C:\raylib\raylib\examples folder or
+ *   raylib official webpage: www.raylib.com
+ *
+ *   Enjoy using raylib. :)
+ *
+ *   This example has been created using raylib 2.0 (www.raylib.com)
+ *   raylib is licensed under an unmodified zlib/libpng license (View raylib.h
+ *for details)
+ *
+ *   Copyright (c) 2013-2016 Ramon Santamaria (@raysan5)
+ *
+ ********************************************************************************************/
+
+#include "raylib.h"
+#include "rnet.h"
+
+#include <assert.h>
+#include <stdio.h>
+#include <string.h>
+
+float         elapsed = 0.0f;
+float         delay   = 1.0f;
+bool          ping    = false;
+bool          pong    = false;
+const char *  pingmsg = "Ping!";
+const char *  pongmsg = "Pong!";
+int           msglen  = 0;
+SocketConfig  client_cfg = {.host = "127.0.0.1", .port = "4950",  .type = SOCKET_UDP, .nonblocking = true};
+SocketResult *client_res = NULL;
+SocketSet *   socket_set = NULL;
+char          recvBuffer[512];
+
+// Once connected to the network, check the sockets for pending information
+// and when information is ready, send either a Ping or a Pong.
+void NetworkUpdate()
+{
+	// CheckSockets
+	//
+	// If any of the sockets in the socket_set are pending (received data, or requests)
+	// then mark the socket as being ready. You can check this with IsSocketReady(client_res->socket)
+	int active = CheckSockets(socket_set, 0);
+	if (active != 0) {
+		TraceLog(LOG_DEBUG,
+				 "There are currently %d socket(s) with data to be processed.", active);
+	}
+
+	// IsSocketReady
+	//
+	// If the socket is ready, attempt to receive data from the socket
+	int bytesRecv = 0;
+	if (IsSocketReady(client_res->socket)) {
+		bytesRecv = SocketReceive(client_res->socket, recvBuffer, msglen);
+	}
+
+	// If we received data, was that data a "Ping!" or a "Pong!"
+	if (bytesRecv > 0) {
+		if (strcmp(recvBuffer, pingmsg) == 0) { pong = true; }
+		if (strcmp(recvBuffer, pongmsg) == 0) { ping = true; }
+	}
+
+	// After each delay has expired, send a response "Ping!" for a "Pong!" and vice versa
+	elapsed += GetFrameTime();
+	if (elapsed > delay) {
+		if (ping) {
+			ping = false;
+			SocketSend(client_res->socket, pingmsg, msglen);
+		} else if (pong) {
+			pong = false;
+			SocketSend(client_res->socket, pongmsg, msglen);
+		}
+		elapsed = 0.0f;
+	}
+}
+
+int main()
+{
+	// Setup
+	int screenWidth  = 800;
+	int screenHeight = 450;
+	InitWindow(
+		screenWidth, screenHeight, "raylib [network] example - udp client");
+	SetTargetFPS(60);
+	SetTraceLogLevel(LOG_DEBUG);
+
+	// Networking
+	InitNetwork();
+
+	// Create the client
+	//
+	//  Performs
+	//      getaddrinfo
+	//      socket
+	//      setsockopt
+	//      connect (TCP only)
+	client_res = AllocSocketResult();
+	if (!SocketCreate(&client_cfg, client_res)) {
+		TraceLog(LOG_WARNING, "Failed to open client: status %d, errno %d",
+				 client_res->status, client_res->socket->status);
+	}
+
+	//  Create & Add sockets to the socket set
+	socket_set = AllocSocketSet(1);
+	msglen     = strlen(pingmsg) + 1;
+	ping       = true;
+	memset(recvBuffer, '\0', sizeof(recvBuffer));
+	AddSocket(socket_set, client_res->socket);
+
+	// Main game loop
+	while (!WindowShouldClose()) {
+		BeginDrawing();
+		ClearBackground(RAYWHITE);
+		NetworkUpdate();
+		EndDrawing();
+	}
+
+	// Cleanup
+	CloseWindow();
+	return 0;
+}