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1/*
2This file is part of Darling.
3
4Copyright (C) 2020 Lubos Dolezel
5
6Darling is free software: you can redistribute it and/or modify
7it under the terms of the GNU General Public License as published by
8the Free Software Foundation, either version 3 of the License, or
9(at your option) any later version.
10
11Darling is distributed in the hope that it will be useful,
12but WITHOUT ANY WARRANTY; without even the implied warranty of
13MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14GNU General Public License for more details.
15
16You should have received a copy of the GNU General Public License
17along with Darling. If not, see <http://www.gnu.org/licenses/>.
18*/
19
20#ifndef _COMPONENT_DISPATCH_H
21#define _COMPONENT_DISPATCH_H
22#include "AudioComponentManager.h"
23#include <CarbonCore/Components.h>
24
25template <typename First, typename... Rest>
26void assignParams(ComponentParameters* cp, size_t totalArgs, size_t argumentIndex, First arg, Rest... rest)
27{
28#if __LP64__
29 cp->params[argumentIndex] = long(arg);
30#else
31 cp->params[totalArgs - argumentIndex - 1] = long(arg);
32#endif
33
34 if constexpr (sizeof...(Rest) > 0)
35 assignParams(cp, totalArgs, argumentIndex+1, rest...);
36}
37
38template <typename ...Args>
39OSStatus dispatchCall(AudioComponentInstance inUnit, SInt16 sel, Args... args)
40{
41 if (AudioComponentManager::isOurInstance(inUnit))
42 {
43 AudioComponentPlugInInterface* iface = AudioComponentManager::instance()->instanceInterface(inUnit);
44 AudioComponentMethod method = iface->Lookup(sel);
45 if (method != nullptr)
46 return method(iface, args...);
47 else
48 return badComponentSelector;
49 }
50 else
51 {
52 ComponentParameters* cp = (ComponentParameters*) alloca(sizeof(ComponentParameters) + sizeof...(Args) * sizeof(long));
53 constexpr size_t totalArgs = sizeof...(Args)+1;
54
55 assignParams(cp, totalArgs, 0, inUnit);
56
57 if constexpr (totalArgs > 1)
58 assignParams(cp, totalArgs, 1, args...);
59
60 cp->paramSize = totalArgs * sizeof(long);
61 cp->what = sel;
62 cp->flags = 0;
63
64 return CallComponentDispatch(cp);
65 }
66}
67
68#endif
69