private static void WriteProtocol(XContainer doc, CSharpWriter w)
{
// for writing the high level API
var hlw = new CSharpWriter();
var protocolElement = doc.Element(ProtocolElement);
if (protocolElement == null)
{
throw new Exception("No protocol element found!");
}
var protocolName = protocolElement.Attribute(NameAttrib).Value;
w.Line($"// Protocol: {protocolName}");
w.Line();
w.Line("using System;");
w.Line("using System.Runtime.InteropServices;");
w.Line();
hlw.Line("namespace OpenWindow.Backends.Wayland.Managed");
hlw.OpenBlock();
w.Line("namespace OpenWindow.Backends.Wayland");
w.OpenBlock();
var interfaceElements = protocolElement.Elements(InterfaceElement);
var ifaces = interfaceElements.Select(e => new Interface(e)).ToArray();
var messages = ifaces.SelectMany(iface => iface.Requests.Concat(iface.Events)).ToArray();
var ifaceCount = ifaces.Length;
var msgCount = messages.Length;
_protocolClassName = Util.ToPascalCase(protocolName) + "Bindings";
w.Line($"internal static unsafe partial class {_protocolClassName}");
w.OpenBlock();
w.Line("private static bool _loaded;");
w.Line();
w.Line("public static wl_interface* Interfaces;");
w.Line("private static wl_message* _messages;");
w.Line("private static wl_interface** _signatureTypes;");
w.Line();
w.Line($"private static readonly int InterfaceCount = {ifaceCount};");
w.Line($"private static readonly int MessageCount = {msgCount};");
w.Line();
foreach (var iface in ifaces)
{
w.Line($"public const string {iface.RawName}_name = \"{iface.RawName}\";");
}
w.Line();
w.Line("public static void Load()");
w.OpenBlock();
w.Line("if (_loaded)");
w.LineIndented("return;");
w.Line("_loaded = true;");
w.Line();
w.Line("Interfaces = (wl_interface*) Marshal.AllocHGlobal(sizeof(wl_interface) * InterfaceCount);");
w.Line("_messages = (wl_message*) Marshal.AllocHGlobal(sizeof(wl_message) * MessageCount);");
w.Line();
w.Line();
for (var i = 0; i < ifaces.Length; i++)
{
var iface = ifaces[i];
w.Line($"Util.CreateInterface(&Interfaces[{i}], \"{iface.RawName}\", {iface.Version}, {iface.Requests.Length}, {iface.Events.Length});");
}
w.Line();
var signatureTypes = new List <string>();
var typeMap = new List <(string TypeStr, int Index)>();
var typeMapIndex = 0;
// handle messages with the most types first so we don't create duplicates
foreach (var message in messages.OrderByDescending(m => m.SigTypes.Length))
{
var typesIndex = 0;
var typeStr = ';' + string.Join(";", message.SigTypes) + ';';
var match = typeMap.Where(t => t.TypeStr.Contains(typeStr));
if (match.Any())
{
var m = match.First();
var offset = m.TypeStr.Take(m.TypeStr.IndexOf(typeStr)).Count(c => c == ';');
typeMap.Add((typeStr, m.Index + offset));
typesIndex = m.Index + offset;
}
else
{
typeMap.Add((typeStr, typeMapIndex));
typesIndex = typeMapIndex;
foreach (var type in message.SigTypes)
{
var sigTypeStr = type == string.Empty ? null : type;
signatureTypes.Add(sigTypeStr);
typeMapIndex++;
}
}
message.SigTypesIndex = typesIndex;
}
w.Line($"_signatureTypes = (wl_interface**) Marshal.AllocHGlobal(sizeof(void*) * {signatureTypes.Count});");
for (int i = 0; i < signatureTypes.Count; i++)
{
var stype = signatureTypes[i];
var stypeStr = stype == null ? "null" : stype + ".Interface";
w.Line($"_signatureTypes[{i}] = {stypeStr};");
}
w.Line();
for (var i = 0; i < messages.Length; i++)
{
var message = messages[i];
w.Line($"Util.CreateMessage(&_messages[{i}], \"{message.RawName}\", \"{message.Signature}\", &_signatureTypes[{message.SigTypesIndex}]);");
}
w.Line();
var msgIndex = 0;
for (var i = 0; i < ifaces.Length; i++)
{
var iface = ifaces[i];
var reqInit = iface.Requests.Length == 0 ? "null" : $"&_messages[{msgIndex}]";
w.Line($"Interfaces[{i}].Requests = {reqInit};");
msgIndex += iface.Requests.Length;
var evInit = iface.Events.Length == 0 ? "null" : $"&_messages[{msgIndex}]";
w.Line($"Interfaces[{i}].Events = {evInit};");
msgIndex += iface.Events.Length;
}
w.CloseBlock();
w.Line();
w.Line("public static void Unload()");
w.OpenBlock();
w.Line("if (!_loaded)");
w.LineIndented("return;");
w.Line("_loaded = false;");
w.Line();
w.Line("for (var i = 0; i < InterfaceCount; i++)");
w.LineIndented($"Marshal.FreeHGlobal((IntPtr) Interfaces[i].Name);");
w.Line();
w.Line("for (var i = 0; i < MessageCount; i++)");
w.OpenBlock();
w.Line("Marshal.FreeHGlobal((IntPtr) _messages[i].Name);");
w.Line("Marshal.FreeHGlobal((IntPtr) _messages[i].Signature);");
w.CloseBlock();
w.Line();
w.Line("Marshal.FreeHGlobal((IntPtr) _messages);");
w.Line("Marshal.FreeHGlobal((IntPtr) _signatureTypes);");
w.Line("Marshal.FreeHGlobal((IntPtr) Interfaces);");
w.CloseBlock();
w.Line();
foreach (var iface in ifaces)
{
hlw.Line($"internal unsafe partial struct {iface.ClsName}");
hlw.OpenBlock();
hlw.Line($"public static IntPtr Interface => (IntPtr) {iface.RawName}.Interface;");
hlw.Line($"public static {iface.ClsName} Null => new {iface.ClsName}();");
hlw.Line($"public readonly {iface.RawName}* Pointer;");
hlw.Line("public bool IsNull => Pointer == null;");
if (iface.Events.Length != 0)
{
// cached delegates to prevent GC
foreach (var ev in iface.Events)
{
hlw.Line($"private {_protocolClassName}.{GetDelegateName(iface, ev)} _{ev.RawName};");
}
// unmanaged listener, needs to be freed by users
hlw.Line($"private {_protocolClassName}.{iface.RawName}_listener* _listener;");
}
// we need to initialize all fields in the ctor
var eventInitializer = iface.Events.Length == 0 ? "" :
" _listener = null; " + string.Join(' ', iface.Events.Select(ev => "_" + ev.RawName + " = null;"));
hlw.Line($"public {iface.ClsName}({iface.RawName}* ptr) {{ Pointer = ptr;{eventInitializer} }}");
hlw.Line($"public static implicit operator {iface.ClsName}({iface.RawName}* ptr) => new {iface.ClsName}(ptr);");
hlw.Line($"public static explicit operator {iface.ClsName}(wl_proxy* ptr) => new {iface.ClsName}(({iface.RawName}*) ptr);");
WriteRequests(iface, w, hlw);
WriteEvents(iface, w, hlw);
if (!iface.Requests.Any(m => "destructor".Equals(m.Type)))
{
hlw.Line("public void Destroy() { if (!IsNull) WaylandClient.wl_proxy_destroy((wl_proxy*) Pointer); }");
}
hlw.CloseBlock();
}
w.CloseBlock(); // class {ProtocolName}Bindings*/
w.Line();
// dummy structs for typed pointers
for (var i = 0; i < ifaces.Length; i++)
{
var iface = ifaces[i];
WriteDescription(iface.Element, w);
w.Line($"internal struct {iface.RawName} {{ public static unsafe wl_interface* Interface => &{_protocolClassName}.Interfaces[{i}]; }}");
}
w.Line();
foreach (var iface in ifaces)
{
foreach (var e in iface.Enums)
{
w.Line();
WriteEnum(iface, e, w);
}
}
w.CloseBlock(); // namespace
hlw.CloseBlock(); // namespace
w.Line();
w.Write(hlw);
}