//--------------------------------------------------------------------------------------
// This callback function will be called immediately after the Direct3D device has been 
// created, which will happen during application initialization and windowed/full screen 
// toggles. This is the best location to create D3DPOOL_MANAGED resources since these 
// resources need to be reloaded whenever the device is destroyed. Resources created  
// here should be released in the OnDestroyDevice callback. 
//--------------------------------------------------------------------------------------
HRESULT CALLBACK OnCreateDevice( IDirect3DDevice9* pd3dDevice, const D3DSURFACE_DESC* pBackBufferSurfaceDesc,
                                 void* pUserContext )
{
    HRESULT hr;
 
    V_RETURN( g_DialogResourceManager.OnD3D9CreateDevice( pd3dDevice ) );
    V_RETURN( g_SettingsDlg.OnD3D9CreateDevice( pd3dDevice ) );
    // Initialize the font
    V_RETURN( D3DXCreateFont( pd3dDevice, 15, 0, FW_BOLD, 1, FALSE, DEFAULT_CHARSET,
                              OUT_DEFAULT_PRECIS, DEFAULT_QUALITY, DEFAULT_PITCH | FF_DONTCARE,
                              L"Arial", &g_pFont ) );
 
    // Load the mesh *******************************************************************
    V_RETURN( LoadMesh( pd3dDevice, L"tiny\\tiny.x", &g_pMesh ) );
 
    D3DXVECTOR3* pData;
    D3DXVECTOR3 vCenter;
    FLOAT fObjectRadius;
 
	// memory locking *******************************************************************
    V( g_pMesh->LockVertexBuffer( 0, ( LPVOID* )&pData ) );
    V( D3DXComputeBoundingSphere( pData, g_pMesh->GetNumVertices(),
                                  D3DXGetFVFVertexSize( g_pMesh->GetFVF() ), &vCenter, &fObjectRadius ) );
    V( g_pMesh->UnlockVertexBuffer() );
    ////////
 
    D3DXMatrixTranslation( &g_mCenterWorld, -vCenter.x, -vCenter.y, -vCenter.z );
    D3DXMATRIXA16 m;
    D3DXMatrixRotationY( &m, D3DX_PI );
    g_mCenterWorld *= m;
    D3DXMatrixRotationX( &m, D3DX_PI / 2.0f );
    g_mCenterWorld *= m;
 
    V_RETURN( CDXUTDirectionWidget::StaticOnD3D9CreateDevice( pd3dDevice ) );
    for( int i = 0; i < MAX_LIGHTS; i++ )
        g_LightControl[i].SetRadius( fObjectRadius );
 
    // Define DEBUG_VS and/or DEBUG_PS to debug vertex and/or pixel shaders with the 
    // shader debugger. Debugging vertex shaders requires either REF or software vertex 
    // processing, and debugging pixel shaders requires REF.  The 
    // D3DXSHADER_FORCE_*_SOFTWARE_NOOPT flag improves the debug experience in the 
    // shader debugger.  It enables source level debugging, prevents instruction 
    // reordering, prevents dead code elimination, and forces the compiler to compile 
    // against the next higher available software target, which ensures that the 
    // unoptimized shaders do not exceed the shader model limitations.  Setting these 
    // flags will cause slower rendering since the shaders will be unoptimized and 
    // forced into software.  See the DirectX documentation for more information about 
    // using the shader debugger.
    DWORD dwShaderFlags = D3DXFX_NOT_CLONEABLE;
 
#if defined( DEBUG ) || defined( _DEBUG )
    // Set the D3DXSHADER_DEBUG flag to embed debug information in the shaders.
    // Setting this flag improves the shader debugging experience, but still allows 
    // the shaders to be optimized and to run exactly the way they will run in 
    // the release configuration of this program.
    dwShaderFlags |= D3DXSHADER_DEBUG;
    #endif
 
#ifdef DEBUG_VS
        dwShaderFlags |= D3DXSHADER_FORCE_VS_SOFTWARE_NOOPT;
    #endif
#ifdef DEBUG_PS
        dwShaderFlags |= D3DXSHADER_FORCE_PS_SOFTWARE_NOOPT;
    #endif
 
    // Preshaders are parts of the shader that the effect system pulls out of the 
    // shader and runs on the host CPU. They should be used if you are GPU limited. 
    // The D3DXSHADER_NO_PRESHADER flag disables preshaders.
    if( !g_bEnablePreshader )
        dwShaderFlags |= D3DXSHADER_NO_PRESHADER;
 
    // Read the D3DX effect file
    WCHAR str[MAX_PATH];
    V_RETURN( DXUTFindDXSDKMediaFileCch( str, MAX_PATH, L"BasicHLSL.fx" ) );
 
    // If this fails, there should be debug output as to 
    // why the .fx file failed to compile
    V_RETURN( D3DXCreateEffectFromFile( pd3dDevice, str, NULL, NULL, dwShaderFlags, NULL, &g_pEffect, NULL ) );
 
    // Create the mesh texture from a file *******************************************************************
    V_RETURN( DXUTFindDXSDKMediaFileCch( str, MAX_PATH, L"tiny\\tiny_skin.dds" ) );
 
    V_RETURN( D3DXCreateTextureFromFileEx( pd3dDevice, str, D3DX_DEFAULT, D3DX_DEFAULT,
                                           D3DX_DEFAULT, 0, D3DFMT_UNKNOWN, D3DPOOL_MANAGED,
                                           D3DX_DEFAULT, D3DX_DEFAULT, 0,
                                           NULL, NULL, &g_pMeshTexture ) );
 
    // Set effect variables as needed
    D3DXCOLOR colorMtrlDiffuse( 1.0f, 1.0f, 1.0f, 1.0f );
    D3DXCOLOR colorMtrlAmbient( 0.35f, 0.35f, 0.35f, 0 );
 
    V_RETURN( g_pEffect->SetValue( "g_MaterialAmbientColor", &colorMtrlAmbient, sizeof( D3DXCOLOR ) ) );
    V_RETURN( g_pEffect->SetValue( "g_MaterialDiffuseColor", &colorMtrlDiffuse, sizeof( D3DXCOLOR ) ) );
    V_RETURN( g_pEffect->SetTexture( "g_MeshTexture", g_pMeshTexture ) );
 
    // Setup the camera's view parameters
    D3DXVECTOR3 vecEye( 0.0f, 0.0f, -15.0f );
    D3DXVECTOR3 vecAt ( 0.0f, -0.0f, -0.0f );
    g_Camera.SetViewParams( &vecEye, &vecAt );
    g_Camera.SetRadius( fObjectRadius * 3.0f, fObjectRadius * 0.5f, fObjectRadius * 10.0f );
 
    return S_OK;
}
 
//--------------------------------------------------------------------------------------
// This function loads the mesh and ensures the mesh has normals; it also optimizes the 
// mesh for the graphics card's vertex cache, which improves performance by organizing 
// the internal triangle list for less cache misses.
//--------------------------------------------------------------------------------------
HRESULT LoadMesh( IDirect3DDevice9* pd3dDevice, WCHAR* strFileName, ID3DXMesh** ppMesh )
{
    ID3DXMesh* pMesh = NULL;
    WCHAR str[MAX_PATH];
    HRESULT hr;
 
    // Load the mesh with D3DX and get back a ID3DXMesh*.  For this
    // sample we'll ignore the X file's embedded materials since we know 
    // exactly the model we're loading.  See the mesh samples such as
    // "OptimizedMesh" for a more generic mesh loading example.
    V_RETURN( DXUTFindDXSDKMediaFileCch( str, MAX_PATH, strFileName ) );
    V_RETURN( D3DXLoadMeshFromX( str, D3DXMESH_MANAGED, pd3dDevice, NULL, NULL, NULL, NULL, &pMesh ) );
 
    DWORD* rgdwAdjacency = NULL;
 
    // Make sure there are normals which are required for lighting
    if( !( pMesh->GetFVF() & D3DFVF_NORMAL ) )
    {
        ID3DXMesh* pTempMesh;
        V( pMesh->CloneMeshFVF( pMesh->GetOptions(),
                                pMesh->GetFVF() | D3DFVF_NORMAL,
                                pd3dDevice, &pTempMesh ) );
        V( D3DXComputeNormals( pTempMesh, NULL ) );
 
        SAFE_RELEASE( pMesh );
        pMesh = pTempMesh;
    }
 
    // Optimize the mesh for this graphics card's vertex cache 
    // so when rendering the mesh's triangle list the vertices will 
    // cache hit more often so it won't have to re-execute the vertex shader 
    // on those vertices so it will improve perf.     
    rgdwAdjacency = new DWORD[pMesh->GetNumFaces() * 3];
    if( rgdwAdjacency == NULL )
        return E_OUTOFMEMORY;
    V( pMesh->GenerateAdjacency( 1e-6f, rgdwAdjacency ) );
    V( pMesh->OptimizeInplace( D3DXMESHOPT_VERTEXCACHE, rgdwAdjacency, NULL, NULL, NULL ) );
    delete []rgdwAdjacency;
 
    *ppMesh = pMesh;
 
    return S_OK;
}