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 "gba/context/context.h"
  7
  8#include "gba/context/overrides.h"
  9
 10#include "util/memory.h"
 11#include "util/vfs.h"
 12
 13static struct VFile* _logFile = 0;
 14static void _GBAContextLog(struct GBAThread* thread, enum GBALogLevel level, const char* format, va_list args);
 15
 16bool GBAContextInit(struct GBAContext* context, const char* port) {
 17	context->gba = anonymousMemoryMap(sizeof(struct GBA));
 18	context->cpu = anonymousMemoryMap(sizeof(struct ARMCore));
 19	context->rom = 0;
 20	context->bios = 0;
 21	context->fname = 0;
 22	context->save = 0;
 23	context->renderer = 0;
 24	memset(context->components, 0, sizeof(context->components));
 25
 26	if (!context->gba || !context->cpu) {
 27		if (context->gba) {
 28			mappedMemoryFree(context->gba, sizeof(struct GBA));
 29		}
 30		if (context->cpu) {
 31			mappedMemoryFree(context->cpu, sizeof(struct ARMCore));
 32		}
 33		return false;
 34	}
 35	GBACreate(context->gba);
 36	ARMSetComponents(context->cpu, &context->gba->d, 0, context->components);
 37	ARMInit(context->cpu);
 38
 39	GBAConfigInit(&context->config, port);
 40	if (port) {
 41		if (!_logFile) {
 42			char logPath[PATH_MAX];
 43			GBAConfigDirectory(logPath, PATH_MAX);
 44			strncat(logPath, PATH_SEP "log", PATH_MAX - strlen(logPath));
 45			_logFile = VFileOpen(logPath, O_WRONLY | O_CREAT | O_TRUNC);
 46		}
 47		context->gba->logHandler = _GBAContextLog;
 48
 49		char biosPath[PATH_MAX];
 50		GBAConfigDirectory(biosPath, PATH_MAX);
 51		strncat(biosPath, PATH_SEP "gba_bios.bin", PATH_MAX - strlen(biosPath));
 52
 53		struct GBAOptions opts = {
 54			.bios = biosPath,
 55			.useBios = true,
 56			.idleOptimization = IDLE_LOOP_DETECT,
 57			.logLevel = GBA_LOG_WARN | GBA_LOG_ERROR | GBA_LOG_FATAL | GBA_LOG_STATUS
 58		};
 59		GBAConfigLoad(&context->config);
 60		GBAConfigLoadDefaults(&context->config, &opts);
 61	}
 62
 63	context->gba->sync = 0;
 64	return true;
 65}
 66
 67void GBAContextDeinit(struct GBAContext* context) {
 68	ARMDeinit(context->cpu);
 69	GBADestroy(context->gba);
 70	mappedMemoryFree(context->gba, 0);
 71	mappedMemoryFree(context->cpu, 0);
 72	GBAConfigDeinit(&context->config);
 73}
 74
 75bool GBAContextLoadROM(struct GBAContext* context, const char* path, bool autoloadSave) {
 76	context->rom = VFileOpen(path, O_RDONLY);
 77	if (!context->rom) {
 78		return false;
 79	}
 80
 81	if (!GBAIsROM(context->rom)) {
 82		context->rom->close(context->rom);
 83		context->rom = 0;
 84		return false;
 85	}
 86
 87	context->fname = path;
 88	if (autoloadSave) {
 89		context->save = VDirOptionalOpenFile(0, path, 0, ".sav", O_RDWR | O_CREAT);
 90	}
 91	return true;
 92}
 93
 94void GBAContextUnloadROM(struct GBAContext* context) {
 95	GBAUnloadROM(context->gba);
 96	if (context->bios) {
 97		context->bios->close(context->bios);
 98		context->bios = 0;
 99	}
100	if (context->rom) {
101		context->rom->close(context->rom);
102		context->rom = 0;
103	}
104	if (context->save) {
105		context->save->close(context->save);
106		context->save = 0;
107	}
108}
109
110bool GBAContextLoadROMFromVFile(struct GBAContext* context, struct VFile* rom, struct VFile* save) {
111	context->rom = rom;
112	if (!GBAIsROM(context->rom)) {
113		context->rom = 0;
114		return false;
115	}
116	context->save = save;
117	return true;
118}
119
120bool GBAContextLoadBIOS(struct GBAContext* context, const char* path) {
121	context->bios = VFileOpen(path, O_RDONLY);
122	if (!context->bios) {
123		return false;
124	}
125
126	if (!GBAIsBIOS(context->bios)) {
127		context->bios->close(context->bios);
128		context->bios = 0;
129		return false;
130	}
131	return true;
132}
133
134bool GBAContextLoadBIOSFromVFile(struct GBAContext* context, struct VFile* bios) {
135	context->bios = bios;
136	if (!GBAIsBIOS(context->bios)) {
137		context->bios = 0;
138		return false;
139	}
140	return true;
141}
142
143bool GBAContextStart(struct GBAContext* context) {
144	struct GBAOptions opts = { .bios = 0 };
145
146	if (context->renderer) {
147		GBAVideoAssociateRenderer(&context->gba->video, context->renderer);
148	}
149
150	if (!GBALoadROM(context->gba, context->rom, context->save, context->fname)) {
151		return false;
152	}
153
154	GBAConfigMap(&context->config, &opts);
155
156	if (!context->bios && opts.bios) {
157		GBAContextLoadBIOS(context, opts.bios);
158	}
159	if (opts.useBios && context->bios) {
160		GBALoadBIOS(context->gba, context->bios);
161	}
162	context->gba->logLevel = opts.logLevel;
163	context->gba->idleOptimization = opts.idleOptimization;
164
165	ARMReset(context->cpu);
166
167	if (opts.skipBios) {
168		GBASkipBIOS(context->cpu);
169	}
170
171	struct GBACartridgeOverride override;
172	const struct GBACartridge* cart = (const struct GBACartridge*) context->gba->memory.rom;
173	memcpy(override.id, &cart->id, sizeof(override.id));
174	if (GBAOverrideFind(GBAConfigGetOverrides(&context->config), &override)) {
175		GBAOverrideApply(context->gba, &override);
176	}
177	GBAConfigFreeOpts(&opts);
178	return true;
179}
180
181void GBAContextStop(struct GBAContext* context) {
182	UNUSED(context);
183	// TODO?
184}
185
186void GBAContextFrame(struct GBAContext* context, uint16_t keys) {
187	int activeKeys = keys;
188	context->gba->keySource = &activeKeys;
189
190	int frameCounter = context->gba->video.frameCounter;
191	while (frameCounter == context->gba->video.frameCounter) {
192		ARMRunLoop(context->cpu);
193	}
194}
195
196static void _GBAContextLog(struct GBAThread* thread, enum GBALogLevel level, const char* format, va_list args) {
197	UNUSED(thread);
198	UNUSED(level);
199	// TODO: Make this local
200	if (!_logFile) {
201		return;
202	}
203	char out[256];
204	size_t len = vsnprintf(out, sizeof(out), format, args);
205	if (len >= sizeof(out)) {
206		len = sizeof(out) - 1;
207	}
208	out[len] = '\n';
209	_logFile->write(_logFile, out, len + 1);
210}