// D3DApp
HRESULT D3DApp::Draw()
{
    // Clear back buffer
    float ClearColor[4] = { 0.0f, 0.0f, 0.7f, 1.0f };
    m_deviceContext->ClearRenderTargetView( m_renderTargetView, ClearColor );

    // Clear depth buffer
    m_deviceContext->ClearDepthStencilView( m_depthStencilView, D3D11_CLEAR_DEPTH, 1.0f, 0 );

    // Draw code
    m_scene->Draw();

    return m_swapChain->Present( 0, 0 );
}

// Scene
HRESULT Scene::Draw()
{
    HRESULT hr = S_OK;

    // Set Rasterizer State
    //m_deviceContext->RSSetState( m_rasterizerState );

    // Set cbuffer ( update camera )
    D3D11_MAPPED_SUBRESOURCE mappedSubRes;
    CBWorldViewProj* dataPtr;

    m_deviceContext->Map( m_WVPBuffer, 0, D3D11_MAP_WRITE_DISCARD, 0, &mappedSubRes );
    dataPtr = (CBWorldViewProj*)mappedSubRes.pData;
    dataPtr->world = XMMatrixTranspose( XMLoadFloat4x4( &m_worldMatrix ) );
    dataPtr->view  = XMMatrixTranspose( m_camera->View() );
    dataPtr->proj  = XMMatrixTranspose( m_camera->Proj() );

    m_deviceContext->Unmap( m_WVPBuffer, 0 );
    m_deviceContext->VSSetConstantBuffers( 0, 1, &m_WVPBuffer );
    m_deviceContext->GSSetConstantBuffers( 0, 1, &m_WVPBuffer );

    // Draw game
    hr = m_game->Draw();

    return hr;
}

// Game
HRESULT Game::Draw()
{

    //m_tile->Draw();

    // Set vertex description
    m_deviceContext->IASetInputLayout( m_shader->inputLayout );

    // Set shader stages
    m_deviceContext->VSSetShader( m_shader->vertexShader, NULL, 0 );
    m_deviceContext->HSSetShader( NULL, NULL, 0 );
    m_deviceContext->DSSetShader( NULL, NULL, 0 );
    m_deviceContext->GSSetShader( NULL, NULL, 0 );
    m_deviceContext->PSSetShader( m_shader->pixelShader, NULL, 0 );

    // Set samplerstate and shader resource view
    m_deviceContext->PSSetSamplers( 0, 1, &m_samplerState );
    m_deviceContext->PSSetShaderResources( 0, 1, &m_simpleShaderResourceView );

    // Draw
    //m_terrain->Draw();

    m_tile->Draw();

    return S_OK;
}