b5583e233e
Change-Id: I41e4088a92fff2f411dd82102fc3c421d2679c21 Reviewed-on: https://go-review.googlesource.com/13582 Reviewed-by: David Crawshaw <crawshaw@golang.org>
74 lines
2.3 KiB
C
74 lines
2.3 KiB
C
// Copyright 2015 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// +build android
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#include <stdlib.h>
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#include <jni.h>
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#include <android/sensor.h>
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#include "android.h"
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void android_createManager(int looperId, android_SensorManager* dst) {
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ASensorManager* manager = ASensorManager_getInstance();
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ALooper* looper = ALooper_forThread();
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if (looper == NULL) {
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looper = ALooper_prepare(ALOOPER_PREPARE_ALLOW_NON_CALLBACKS);
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}
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ASensorEventQueue* queue = ASensorManager_createEventQueue(manager, looper, looperId, NULL, NULL);
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dst->looper = looper;
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dst->queue = queue;
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dst->looperId = looperId;
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}
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int android_enableSensor(ASensorEventQueue* q, int s, int32_t usec) {
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ASensorManager* manager = ASensorManager_getInstance();
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const ASensor* sensor = ASensorManager_getDefaultSensor(manager, s);
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if (sensor == NULL) {
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return 1;
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}
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ASensorEventQueue_enableSensor(q, sensor);
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ASensorEventQueue_setEventRate(q, sensor, usec);
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return 0;
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}
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void android_disableSensor(ASensorEventQueue* q, int s) {
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ASensorManager* manager = ASensorManager_getInstance();
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const ASensor* sensor = ASensorManager_getDefaultSensor(manager, s);
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ASensorEventQueue_disableSensor(q, sensor);
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}
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int android_readQueue(int looperId, ASensorEventQueue* q, int n, int32_t* types, int64_t* timestamps, float* vectors) {
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int id;
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int events;
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ASensorEvent event;
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int i = 0;
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// Block for 30 secs at most, timeout if nothing happens.
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// Try n times read from the event queue.
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// If anytime timeout occurs, don't retry to read and immediately return.
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// Consume the event queue entirely between polls.
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while (i < n && (id = ALooper_pollAll(30*1000, NULL, &events, NULL)) >= 0) {
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if (id != looperId) {
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continue;
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}
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while (i < n && ASensorEventQueue_getEvents(q, &event, 1)) {
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types[i] = event.type;
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timestamps[i] = event.timestamp;
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vectors[i*3] = event.vector.x;
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vectors[i*3+1] = event.vector.y;
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vectors[i*3+2] = event.vector.z;
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i++;
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}
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}
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return i;
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}
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void android_destroyManager(android_SensorManager* m) {
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ASensorManager* manager = ASensorManager_getInstance();
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ASensorManager_destroyEventQueue(manager, m->queue);
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ALooper_release(m->looper);
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}
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