AnalogCallback.c

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/*
// Copyright 2014 Sensics, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
*/

/* Internal Includes */
#include <osvr/ClientKit/ContextC.h>
#include <osvr/ClientKit/InterfaceC.h>
#include <osvr/ClientKit/InterfaceCallbackC.h>

/* Library/third-party includes */
/* none */

/* Standard includes */
#include <stdio.h>

void myAnalogCallback(void *userdata, const OSVR_TimeValue *timestamp,
                      const OSVR_AnalogReport *report) {
    printf("Got report: channel is %f\n", report->state);
}

int main() {
    OSVR_ClientContext ctx =
        osvrClientInit("com.osvr.exampleclients.AnalogCallback", 0);

    OSVR_ClientInterface analogTrigger = NULL;
    /* This is just one of the paths: specifically, the Hydra's left
     * controller's analog trigger. More are in the docs and/or listed on
     * startup
     */
    osvrClientGetInterface(ctx, "/controller/left/trigger", &analogTrigger);

    osvrRegisterAnalogCallback(analogTrigger, &myAnalogCallback, NULL);

    /* Pretend that this is your application's mainloop. */
    int i;
    for (i = 0; i < 1000000; ++i) {
        osvrClientUpdate(ctx);
    }

    osvrClientLog(ctx, OSVR_LOGLEVEL_NOTICE, "Library shut down, exiting.");
    osvrClientShutdown(ctx);
    return 0;
}