C++ dx::StepTimer类代码示例

// Called once per frame.
void DynamicCubemapRenderer::Update(DX::StepTimer const& timer)
{
    m_controller->Update();

    // Update the view matrix based on the camera position.
    m_camera->SetViewParameters(
        m_controller->get_Position(),       // The point the camera is at.
        m_controller->get_LookPoint(),      // The point to look towards.
        float3(0, 1, 0)                     // The up-vector  (+Y).
    );

    // Update the position of the cube and sphere objects.
    XMStoreFloat4x4(
        &m_cubeRotation,
        XMMatrixTranspose(
            XMMatrixRotationY(static_cast<float>(timer.GetTotalSeconds()) / 4 * XM_PIDIV4)
        )
    );

    XMStoreFloat4x4(
        &m_cube2Rotation,
        XMMatrixTranspose(
            XMMatrixRotationX(static_cast<float>(timer.GetTotalSeconds()) / 4 * XM_PIDIV4)
        )
    );

    XMStoreFloat4x4(
        &m_sphereRotation,
        XMMatrixTranspose(XMMatrixTranslation(0.0f, 0.0f, 0.0f))
    );
}

// Called once per frame. Rotates the cube, and calculates and sets the model matrix
// relative to the position transform indicated by hologramPositionTransform.
void SpinningCubeRenderer::Update(const DX::StepTimer& timer)
{
    float const deltaTime = static_cast<float>(timer.GetElapsedSeconds());
    float const lerpDeltaTime = deltaTime * c_lerpRate;

    float3 const prevPosition = m_position;
    m_position = lerp(m_position, m_targetPosition, lerpDeltaTime);

    m_velocity = (prevPosition - m_position) / deltaTime;

    // Rotate the cube.
    // Convert degrees to radians, then convert seconds to rotation angle.
    float const radiansPerSecond = XMConvertToRadians(m_degreesPerSecond);
    float const totalRotation    = static_cast<float>(timer.GetTotalSeconds()) * radiansPerSecond;

    // Scale the cube down to 10cm
    float4x4 const modelScale = make_float4x4_scale({ 0.1f });
    float4x4 const modelRotation = make_float4x4_rotation_y(totalRotation);
    float4x4 const modelTranslation = make_float4x4_translation(m_position);

    m_modelConstantBufferData.model = modelScale * modelRotation * modelTranslation;

    // Use the D3D device context to update Direct3D device-based resources.
    const auto context = m_deviceResources->GetD3DDeviceContext();

    // Update the model transform buffer for the hologram.
    context->UpdateSubresource(
        m_modelConstantBuffer.Get(),
        0,
        nullptr,
        &m_modelConstantBufferData,
        0,
        0
        );
}

// Updates the world.
void Game::Update(DX::StepTimer const& timer)
{
    Vector3 eye(0.0f, 0.7f, 1.5f);
    Vector3 at(0.0f, -0.1f, 0.0f);

    m_view = Matrix::CreateLookAt(eye, at, Vector3::UnitY);

    m_world = Matrix::CreateRotationY(float(timer.GetTotalSeconds() * XM_PIDIV4));

    m_batchEffect->SetView(m_view);
    m_batchEffect->SetWorld(Matrix::Identity);

#ifdef DXTK_AUDIO
    m_audioTimerAcc -= (float)timer.GetElapsedSeconds();
    if (m_audioTimerAcc < 0)
    {
        if (m_retryDefault)
        {
            m_retryDefault = false;
            if (m_audEngine->Reset())
            {
                // Restart looping audio
                m_effect1->Play(true);
            }
        }
        else
        {
            m_audioTimerAcc = 4.f;

            m_waveBank->Play(m_audioEvent++);

            if (m_audioEvent >= 11)
                m_audioEvent = 0;
        }
    }
#endif

    auto pad = m_gamePad->GetState(0);
    if (pad.IsConnected())
    {
        if (pad.IsViewPressed())
        {
            PostQuitMessage(0);
        }
    }

    auto kb = m_keyboard->GetState();
    if (kb.Escape)
    {
        PostQuitMessage(0);
    }
}

// Called once per frame, creates a Y rotation based on elapsed time.
void ShadowSceneRenderer::Update(DX::StepTimer const& timer)
{
    // Convert degrees to radians, then convert seconds to rotation angle.
    float radiansPerSecond = XMConvertToRadians(m_degreesPerSecond);
    double totalRotation = timer.GetTotalSeconds() * radiansPerSecond;

    // Uncomment the following line of code to oscillate the cube instead of
    // rotating it. Useful for testing different margin coefficients in the
    // pixel shader.

    //totalRotation = 9.f + cos(totalRotation) *.2;

    float animRadians = (float)fmod(totalRotation, XM_2PI);

    // Prepare to pass the view matrix, and updated model matrix, to the shader.
    XMStoreFloat4x4(&m_rotatedModelBufferData.model, XMMatrixTranspose(XMMatrixRotationY(animRadians)));

    // If the shadow dimension has changed, recreate it.
    D3D11_TEXTURE2D_DESC desc = { 0 };
    if (m_shadowMap != nullptr)
    {
        m_shadowMap->GetDesc(&desc);
        if (m_shadowMapDimension != desc.Height)
        {
            InitShadowMap();
        }
    }
}

//-----------------------------------------------------------------------------------------------------------------------------------
void Camera::Update(DX::StepTimer const& timer)
{
	// If the camera is fixed we should not do any more updating
	if (m_cameraMode == CameraMode::kFixed)
	{
		return;
	}

	KeyboardInput& keyboard = ScreenManager::GetKeyboardInput();
	Vector2 diff = Vector2::Zero;

	if (keyboard.IsKeyDown(Keyboard::Keys::Left))
	{
		diff.x = -1;
	}
	if (keyboard.IsKeyDown(Keyboard::Keys::Right))
	{
		diff.x = 1;
	}
	if (keyboard.IsKeyDown(Keyboard::Keys::Up))
	{
		diff.y = -1;
	}
	if (keyboard.IsKeyDown(Keyboard::Keys::Down))
	{
		diff.y = 1;
	}

	if (diff != Vector2::Zero)
	{
		diff.Normalize();
		m_position += diff * (float)timer.GetElapsedSeconds() * m_panSpeed;
	}
}

// Updates the world.
void Sample::Update(DX::StepTimer const& timer)
{
    PIXBeginEvent(PIX_COLOR_DEFAULT, L"Update");

    float elapsedTime = float(timer.GetElapsedSeconds());

    auto pad = m_gamePad->GetState(0);
    if (pad.IsConnected())
    {
        m_gamePadButtons.Update(pad);

        if (!m_ui->Update(elapsedTime, pad))
        {
            if (pad.IsViewPressed())
            {
                Windows::ApplicationModel::Core::CoreApplication::Exit();
            }
            if (pad.IsMenuPressed())
            {
                Windows::Xbox::UI::SystemUI::ShowAccountPickerAsync(nullptr,Windows::Xbox::UI::AccountPickerOptions::None);
            }
        }
    }
    else
    {
        m_gamePadButtons.Reset();
    }

    PIXEndEvent();
}

// Updates the world.
void Game::Update(DX::StepTimer const& timer)
{
    PIXBeginEvent(PIX_COLOR_DEFAULT, L"Update");

    float elapsedTime = float(timer.GetElapsedSeconds());
    UNREFERENCED_PARAMETER(elapsedTime);

    auto pad = m_gamePad->GetState(0);
    if (pad.IsConnected())
    {
        m_gamePadButtons.Update(pad);

        if (pad.IsViewPressed())
        {
            Windows::ApplicationModel::Core::CoreApplication::Exit();
        }
    }
    else
    {
        m_gamePadButtons.Reset();
    }

    UpdateGame();

    PIXEndEvent();
}

// Updates the text to be displayed.
void SampleFpsTextRenderer::Update(DX::StepTimer const& timer)
{
	// Update display text.
	uint32 fps = timer.GetFramesPerSecond();

	m_text = (fps > 0) ? std::to_wstring(fps) + L" FPS" : L" - FPS";

	ComPtr<IDWriteTextLayout> textLayout;
	DX::ThrowIfFailed(
		m_deviceResources->GetDWriteFactory()->CreateTextLayout(
			m_text.c_str(),
			(uint32) m_text.length(),
			m_textFormat.Get(),
			240.0f, // Max width of the input text.
			50.0f, // Max height of the input text.
			&textLayout
			)
		);

	DX::ThrowIfFailed(
		textLayout.As(&m_textLayout)
		);

	DX::ThrowIfFailed(
		m_textLayout->GetMetrics(&m_textMetrics)
		);
}

//-----------------------------------------------------------------------------------------------------------------------------------
void Button::Update(DX::StepTimer const& timer)
{
	UIObject::Update(timer);

	if (IsActive())
	{
		m_clickResetTimer += (float)timer.GetElapsedSeconds();
		if (m_clickResetTimer >= m_resetTime)
		{
			m_buttonState = ButtonState::kIdle;
		}

		// Lerp our current colour to the default one to create effect when mouse over button
		SetColour(Color::Lerp(GetColour(), m_defaultColour, (float)timer.GetElapsedSeconds() * 3));
	}
}

// Updates any time-based rendering resources (currently none).
// This method must be implemented for the Overlay class.
void SampleVirtualControllerRenderer::Update(DX::StepTimer const& timer)
{
    // Update the timers for fading out unused touch inputs.
    float frameTime = static_cast<float>(timer.GetElapsedSeconds());
    if (m_stickFadeTimer > 0)  m_stickFadeTimer -= frameTime;
    if (m_buttonFadeTimer > 0) m_buttonFadeTimer -= frameTime;
}

// Called once per frame, updates the scene state.
void Game::Update(DX::StepTimer const& timer)
{
	auto timeDelta = static_cast<float>(timer.GetElapsedSeconds());

	// Update animated models.
	m_skinnedMeshRenderer.UpdateAnimation(timeDelta, m_meshModels);

	// Rotate scene.
	m_rotation = static_cast<float>(timer.GetTotalSeconds()) * 0.5f;

	// Update the "time" variable for the glow effect.
	for (float &time : m_time)
	{
		time = std::max<float>(0.0f, time - timeDelta);
	}
}

// Updates the world.
void Game::Update(DX::StepTimer const& timer)
{
    float elapsedTime = float(timer.GetElapsedSeconds());

    // TODO: Add your game logic here.
    elapsedTime;
}

// Updates the world
void Game::Update(DX::StepTimer const& timer)
{
    float elapsedTime = float(timer.GetElapsedSeconds());

    // TODO: Add your game logic here
    elapsedTime;
    i_render_manager->update();
}

// Updates the world
void Game::Update(DX::StepTimer const& timer)
{
    float elapsedTime = float(timer.GetElapsedSeconds());

    // TODO: Add your game logic here
    m_screenManager->Update(elapsedTime);
    m_screenManager->HandleInput(elapsedTime);
}

// Updates the world
void Game::Update(DX::StepTimer const& timer)
{
    float elapsedTime = float(timer.GetElapsedSeconds());

    // TODO: Add your game logic here
	XMMATRIX m = XMMatrixIdentity();
	m = XMMatrixMultiply(m, XMMatrixTranslation(0.0f, 0.0f, 0.0f));
	XMStoreFloat4x4(&m_constantBufferData.model, m);
    elapsedTime;
}