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#include "lockstep.h"
 7
 8#define LOCKSTEP_INCREMENT 2048
 9
10static bool GBASIOLockstepNodeInit(struct GBASIODriver* driver);
11static void GBASIOLockstepNodeDeinit(struct GBASIODriver* driver);
12static bool GBASIOLockstepNodeLoad(struct GBASIODriver* driver);
13static bool GBASIOLockstepNodeUnload(struct GBASIODriver* driver);
14static uint16_t GBASIOLockstepNodeWriteRegister(struct GBASIODriver* driver, uint32_t address, uint16_t value);
15static int32_t GBASIOLockstepNodeProcessEvents(struct GBASIODriver* driver, int32_t cycles);
16
17void GBASIOLockstepInit(struct GBASIOLockstep* lockstep) {
18	lockstep->players[0] = 0;
19	lockstep->players[1] = 0;
20	lockstep->players[2] = 0;
21	lockstep->players[3] = 0;
22	lockstep->attached = 0;
23	ConditionInit(&lockstep->barrier);
24	MutexInit(&lockstep->mutex);
25}
26
27void GBASIOLockstepDeinit(struct GBASIOLockstep* lockstep) {
28	ConditionDeinit(&lockstep->barrier);
29	MutexDeinit(&lockstep->mutex);
30}
31
32void GBASIOLockstepNodeCreate(struct GBASIOLockstepNode* node) {
33	node->d.init = GBASIOLockstepNodeInit;
34	node->d.deinit = GBASIOLockstepNodeDeinit;
35	node->d.load = GBASIOLockstepNodeLoad;
36	node->d.unload = GBASIOLockstepNodeUnload;
37	node->d.writeRegister = GBASIOLockstepNodeWriteRegister;
38	node->d.processEvents = GBASIOLockstepNodeProcessEvents;
39}
40
41bool GBASIOLockstepAttachNode(struct GBASIOLockstep* lockstep, struct GBASIOLockstepNode* node) {
42	if (lockstep->attached == MAX_GBAS) {
43		return false;
44	}
45	lockstep->players[lockstep->attached] = node;
46	++lockstep->attached;
47	return true;
48}
49
50void GBASIOLockstepDetachNode(struct GBASIOLockstep* lockstep, struct GBASIOLockstepNode* node) {
51	if (lockstep->attached == 0) {
52		return;
53	}
54	int i;
55	for (i = 0; i < lockstep->attached; ++i) {
56		if (lockstep->players[i] != node) {
57			continue;
58		}
59		for (++i; i < lockstep->attached; ++i) {
60			lockstep->players[i - 1] = lockstep->players[i];
61		}
62		--lockstep->attached;
63		break;
64	}
65}
66
67bool GBASIOLockstepNodeInit(struct GBASIODriver* driver) {
68	UNUSED(driver);
69	return true;
70}
71
72void GBASIOLockstepNodeDeinit(struct GBASIODriver* driver) {
73	UNUSED(driver);
74}
75
76bool GBASIOLockstepNodeLoad(struct GBASIODriver* driver) {
77	UNUSED(driver);
78	return true;
79}
80
81bool GBASIOLockstepNodeUnload(struct GBASIODriver* driver) {
82	UNUSED(driver);
83	return true;
84}
85
86static uint16_t GBASIOLockstepNodeWriteRegister(struct GBASIODriver* driver, uint32_t address, uint16_t value) {
87	return value;
88}
89
90static int32_t GBASIOLockstepNodeProcessEvents(struct GBASIODriver* driver, int32_t cycles) {
91	return INT_MAX;
92}