1/* Copyright (c) 2013-2015 Jeffrey Pfau
 2 *
 3 * This Source Code Form is subject to the terms of the Mozilla Public
 4 * License, v. 2.0. If a copy of the MPL was not distributed with this
 5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 6#ifndef SIO_LOCKSTEP_H
 7#define SIO_LOCKSTEP_H
 8
 9#include "core/timing.h"
10#include "gba/sio.h"
11
12enum GBASIOLockstepPhase {
13	TRANSFER_IDLE = 0,
14	TRANSFER_STARTING,
15	TRANSFER_STARTED,
16	TRANSFER_FINISHING,
17	TRANSFER_FINISHED
18};
19
20struct GBASIOLockstep {
21	struct GBASIOLockstepNode* players[MAX_GBAS];
22	int attached;
23	int attachedMulti;
24	int attachedNormal;
25
26	uint16_t multiRecv[MAX_GBAS];
27	uint32_t normalRecv[MAX_GBAS];
28	enum GBASIOLockstepPhase transferActive;
29	int32_t transferCycles;
30
31	bool (*signal)(struct GBASIOLockstep*, unsigned mask);
32	bool (*wait)(struct GBASIOLockstep*, unsigned mask);
33	void (*addCycles)(struct GBASIOLockstep*, int id, int32_t cycles);
34	int32_t (*useCycles)(struct GBASIOLockstep*, int id, int32_t cycles);
35	void (*unload)(struct GBASIOLockstep*, int id);
36	void* context;
37#ifndef NDEBUG
38	int transferId;
39#endif
40};
41
42struct GBASIOLockstepNode {
43	struct GBASIODriver d;
44	struct GBASIOLockstep* p;
45	struct mTimingEvent event;
46
47	volatile int32_t nextEvent;
48	int32_t eventDiff;
49	bool normalSO;
50	int id;
51	enum GBASIOMode mode;
52	bool transferFinished;
53#ifndef NDEBUG
54	int transferId;
55	enum GBASIOLockstepPhase phase;
56#endif
57};
58
59void GBASIOLockstepInit(struct GBASIOLockstep*);
60void GBASIOLockstepDeinit(struct GBASIOLockstep*);
61
62void GBASIOLockstepNodeCreate(struct GBASIOLockstepNode*);
63
64bool GBASIOLockstepAttachNode(struct GBASIOLockstep*, struct GBASIOLockstepNode*);
65void GBASIOLockstepDetachNode(struct GBASIOLockstep*, struct GBASIOLockstepNode*);
66
67#endif