Method computeFPS

testbed/src/TestbedApplication.cpp:565–597

Compute the FPS

// Compute the FPS
void TestbedApplication::computeFPS() {

    // Note : By default the nanogui library is using glfwWaitEvents() to process
    //        events and sleep to target a framerate of 50 ms (using a thread
    //        sleeping). However, for games we prefer to use glfwPollEvents()
    //        instead and remove the update. Therefore the file common.cpp of the
    //        nanogui library has been modified to have a faster framerate

    mNbFrames++;

    //  Get the number of seconds since start
    mCurrentTime = glfwGetTime();

    //  Calculate time passed
    mFrameTime = mCurrentTime - mPreviousTime;
    double timeInterval = (mCurrentTime - mLastTimeComputedFPS) * 1000.0;

    // Update the FPS counter each second
    if(timeInterval > 1000) {

        //  calculate the number of frames per second
        mFPS = static_cast<double>(mNbFrames) / timeInterval;
        mFPS *= 1000.0;

        //  Reset frame count
        mNbFrames = 0;

        mLastTimeComputedFPS = mCurrentTime;
    }

    //  Set time
    mPreviousTime = mCurrentTime;
}

void TestbedApplication::keyboard_event(int key, int scancode, int action, int modifiers) {