/*
    Copyright 2005-2014 Intel Corporation.  All Rights Reserved.

    The source code contained or described herein and all documents related
    to the source code ("Material") are owned by Intel Corporation or its
    suppliers or licensors.  Title to the Material remains with Intel
    Corporation or its suppliers and licensors.  The Material is protected
    by worldwide copyright laws and treaty provisions.  No part of the
    Material may be used, copied, reproduced, modified, published, uploaded,
    posted, transmitted, distributed, or disclosed in any way without
    Intel's prior express written permission.

    No license under any patent, copyright, trade secret or other
    intellectual property right is granted to or conferred upon you by
    disclosure or delivery of the Materials, either expressly, by
    implication, inducement, estoppel or otherwise.  Any license under such
    intellectual property rights must be express and approved by Intel in
    writing.
*/


#include "pch.h"
#include "DirectXPage.xaml.h"
#include "tbb/tbb.h"

using namespace tbbTachyon;

using namespace Platform;
using namespace Windows::Foundation;
using namespace Windows::Foundation::Collections;
using namespace Windows::UI::Input;
using namespace Windows::UI::Core;
using namespace Windows::UI::Xaml;
using namespace Windows::UI::Xaml::Controls;
using namespace Windows::UI::Xaml::Controls::Primitives;
using namespace Windows::UI::Xaml::Data;
using namespace Windows::UI::Xaml::Input;
using namespace Windows::UI::Xaml::Media;
using namespace Windows::UI::Xaml::Navigation;
using namespace Windows::Graphics::Display;

#include "src/tachyon_video.h"
extern int volatile global_number_of_threads;
extern volatile bool global_isCancelled;

#pragma intrinsic(_BitScanReverse)
static int log2( unsigned int x ) {
    DWORD i;
    _BitScanReverse(&i,(DWORD)x);
    return (int)i;
}

const unsigned interval_step_power = 1;
const unsigned num_interval_steps = 1 << (interval_step_power+1);

DirectXPage::DirectXPage() :
    m_renderNeeded(true)
{
    InitializeComponent();

    m_renderer = ref new tbbTachyonRenderer();

    m_renderer->Initialize(
        Window::Current->CoreWindow,
        this,
        DisplayProperties::LogicalDpi
        );

    m_eventToken = CompositionTarget::Rendering::add(ref new EventHandler<Object^>(this, &DirectXPage::OnRendering));

    int num_threads = 2*tbb::task_scheduler_init::default_num_threads();
    // The thread slider has geometric sequence with several intermidiate steps for each interval between 2^N and 2^(N+1).
    // The nearest (from below) the power of 2.
    int i_base = log2(num_threads);
    int base = 1 << i_base;
    // The step size for the current interval.
    int step = base / num_interval_steps;
    // The number of steps inside the interval.
    int i_step = (num_threads-base)/step;

    ThreadsSlider->Maximum = (i_base-interval_step_power)*num_interval_steps + i_step;
    global_number_of_threads = m_number_of_threads = tbb::task_scheduler_init::automatic;
}

DirectXPage::~DirectXPage()
{
}

void DirectXPage::OnRendering(Platform::Object^ sender, Platform::Object^ args)
{
    if (m_renderNeeded){
        m_renderer->Render();
        m_renderer->Present();
        m_renderNeeded = true;
    }
}

void tbbTachyon::DirectXPage::ThreadsApply_Click(Platform::Object^ sender, Windows::UI::Xaml::RoutedEventArgs^ e)
{
    if (global_number_of_threads != m_number_of_threads){
        global_number_of_threads = m_number_of_threads;
        global_isCancelled = true;
        video->running = false;
        m_renderNeeded = true;
        ThreadsApply->Visibility=Windows::UI::Xaml::Visibility::Collapsed;
    }
}

void tbbTachyon::DirectXPage::Exit_Click(Platform::Object^ sender, Windows::UI::Xaml::RoutedEventArgs^ e)
{
    m_renderNeeded = false;
    Application::Current->Exit();
}

void tbbTachyon::DirectXPage::ThreadsSliderValueChanged(Platform::Object^ sender, Windows::UI::Xaml::Controls::Primitives::RangeBaseValueChangedEventArgs^ e)
{
    int pos = (int) e->NewValue;

    // The nearest (from below) the power of 2.
    int base = pos<num_interval_steps ? 0 : 1 << (pos/num_interval_steps+interval_step_power);
    // The step size for the current interval.
    int step = max(1,base/num_interval_steps);
    m_number_of_threads = base + (pos%num_interval_steps)*step;

    if (m_number_of_threads == 0) m_number_of_threads = tbb::task_scheduler_init::automatic;

    NumberOfThreadsTextBlock->Text="Number Of Threads: " + (m_number_of_threads == tbb::task_scheduler_init::automatic? "Auto": m_number_of_threads.ToString());
    if (global_number_of_threads != m_number_of_threads){
        ThreadsApply->Visibility=Windows::UI::Xaml::Visibility::Visible;
    }else{
        ThreadsApply->Visibility=Windows::UI::Xaml::Visibility::Collapsed;
    }
}
