com_osvr_example_selfcontained.cpp

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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/PluginKit/PluginKit.h>
#include <osvr/PluginKit/AnalogInterfaceC.h>

// Generated JSON header file
#include "com_osvr_example_selfcontained_json.h"

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

// Standard includes
#include <iostream>

// Anonymous namespace to avoid symbol collision
namespace {

class AnalogExampleDevice {
  public:
    AnalogExampleDevice(OSVR_PluginRegContext ctx) : m_myVal(0) {
        OSVR_DeviceInitOptions opts = osvrDeviceCreateInitOptions(ctx);

        osvrDeviceAnalogConfigure(opts, &m_analog, 1);

        m_dev.initAsync(ctx, "MyExampleDevice", opts);

        m_dev.sendJsonDescriptor(com_osvr_example_selfcontained_json);

        m_dev.registerUpdateCallback(this);
    }

    OSVR_ReturnCode update() {
        volatile int j; // volatile to keep it from being optimized out.
        for (int i = 0; i < 10000; ++i) {
            j = i;
        }

        m_myVal = (m_myVal + 0.1);
        if (m_myVal > 10.0) {
            m_myVal = 0;
        }

        osvrDeviceAnalogSetValue(m_dev, m_analog, m_myVal, 0);
        return OSVR_RETURN_SUCCESS;
    }

  private:
    osvr::pluginkit::DeviceToken m_dev;
    OSVR_AnalogDeviceInterface m_analog;
    double m_myVal;
};

class HardwareDetection {
  public:
    HardwareDetection() : m_found(false) {}
    OSVR_ReturnCode operator()(OSVR_PluginRegContext ctx) {

        std::cout << "PLUGIN: Got a hardware detection request" << std::endl;
        if (!m_found) {
            std::cout << "PLUGIN: We have detected our fake device! Doing "
                         "setup stuff!"
                      << std::endl;
            m_found = true;

            osvr::pluginkit::registerObjectForDeletion(
                ctx, new AnalogExampleDevice(ctx));
        }
        return OSVR_RETURN_SUCCESS;
    }

  private:
    bool m_found;
};
} // namespace

OSVR_PLUGIN(com_osvr_example_selfcontained) {
    osvr::pluginkit::PluginContext context(ctx);

    context.registerHardwareDetectCallback(new HardwareDetection());

    return OSVR_RETURN_SUCCESS;
}