Initial commit

backends/platform/n64/osys_n64_utilities.cpp

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+/* ScummVM - Graphic Adventure Engine
+ *
+ * ScummVM is the legal property of its developers, whose names
+ * are too numerous to list here. Please refer to the COPYRIGHT
+ * file distributed with this source distribution.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include "osys_n64.h"
+#include "backends/timer/default/default-timer.h"
+
+void checkTimers(void) {
+	OSystem_N64 *osys = dynamic_cast<OSystem_N64 *>(g_system);
+
+	uint32 curTime = osys->getMillis();
+
+	// Timer checking & firing
+	if (osys->_timerCallback && (curTime >= osys->_timerCallbackNext)) {
+		osys->_timerCallback(osys->_timerCallbackTimer);
+		osys->_timerCallbackNext = curTime + osys->_timerCallbackTimer;
+	}
+}
+
+void disableAudioPlayback(void) {
+	if (!_audioEnabled) return;
+
+	_audioEnabled = false;
+
+	while (AI_busy()); // Wait for audio to stop
+}
+
+void enableAudioPlayback(void) {
+	static bool _firstRun = true;
+
+	OSystem_N64 *osys = dynamic_cast<OSystem_N64 *>(g_system);
+	Audio::MixerImpl *localmixer = (Audio::MixerImpl *)osys->getMixer();
+
+	uint32 sampleBufferSize = 3072;
+
+	initAudioInterface(osys->_viClockRate, DEFAULT_SOUND_SAMPLE_RATE, 16, sampleBufferSize);
+	osys->_audioBufferSize = getAIBufferSize();
+
+	if (_firstRun) {
+		localmixer->setReady(true);
+		_firstRun = false;
+	}
+
+	disable_interrupts();
+
+	_audioEnabled = true;
+
+	sndCallback();
+	sndCallback();
+
+	registerAIhandler(sndCallback); // Lib checks if i try to register it multiple times
+
+	enable_interrupts();
+}
+
+static volatile Uint32 _requiredSoundSlots = 0;
+
+void vblCallback(void) {
+	// Switch display buffer
+	switchDisplayBuffer();
+
+	// If audio buffer got depleted, ask for more slots to refill.
+	if (_audioEnabled && !AI_busy() && !_requiredSoundSlots) {
+		sndCallback();
+		sndCallback();
+	}
+
+	dynamic_cast<OSystem_N64 *>(g_system)->readControllerAnalogInput();
+}
+
+void sndCallback() {
+	// Signal that an audio buffer finished playing and that we need more samples
+	if (_requiredSoundSlots < 2)
+		_requiredSoundSlots++;
+}
+
+void refillAudioBuffers(void) {
+	if (!_audioEnabled) return;
+
+	OSystem_N64 *osys = dynamic_cast<OSystem_N64 *>(g_system);
+	byte *sndBuf;
+	Audio::MixerImpl *localmixer = (Audio::MixerImpl *)osys->getMixer();
+
+	while (_requiredSoundSlots) {
+		sndBuf = (byte *)getAIBuffer();
+
+		localmixer->mixCallback((byte *)sndBuf, osys->_audioBufferSize);
+
+		putAIBuffer();
+
+		_requiredSoundSlots--;
+	}
+}
+
+int timer_handler(int t) {
+	DefaultTimerManager *tm = (DefaultTimerManager *)g_system->getTimerManager();
+	tm->handler();
+	return t;
+}