这章主要介绍一下DXUT 里面的GUI元素。要在图形界面中添加GUI元素，首先要定义一个DialogResourceManager对象用来管理对话框资源。DialogResourceManager 管理渲染时状态、Sprite控制批量显示更新、对话框字体、纹理等等。CDXUTDialog 相当于MFC里面的对话框，作为各种控件资源的容器。CD3DSettingsDlg 是一个ms已经写好的对话框类，可以用来设置各种Direct3DDevice9 创建时的参数。点击该对话框的ok 按钮，D3D设备将会重建。
这里先建立了DialogResourceManager全局变量g_DialogResourceManager和CD3DSettingsDlg 全局变量g_SettingsDlg。并且要在 OnCreateDevice OnResetDevice MsgProc OnLostDevice OnDestroyDevice 回调函数中调用自己相应的函数如g_DialogResourceManager.OnCreateDevice(...) 等等。 对于对话框对象使用前必须初始化 init() 参数为DialogResourceManager类对象，即g_DialogResourceManager.之后对于CDXUTDialog类对象g_HUD需要设置自己的消息回调函数 OnGUIEvent()。并且在 dxut 的消息处理函数MsgProc中调用自己的消息处理函数 g_HUD->MsgProc()， 如果是该对话框的消息，Dxut回调函数将不再处理这个消息。而交由对话框处理。  //使用DXUT 框架GUI程序
#include <dxstdafx.h>
//自定义顶点结构
struct CUSTOMVERTEX
   {
 float x,y,z,rhw;
DWORD diffuse;
 };
ID3DXFont* g_pFont = NULL; // Font for drawing text
ID3DXSprite* g_pTextSprite = NULL; // Sprite for batching draw text calls
bool g_bShowHelp = true; // If true, it renders the UI control text
CDXUTDialogResourceManager g_DialogResourceManager; // manager for shared resources of dialogs
CD3DSettingsDlg g_SettingsDlg; // Device settings dialog
CDXUTDialog g_HUD; // dialog for standard controls
static const int D3DFVF_CUSTOMVERTEX = D3DFVF_XYZRHW | D3DFVF_DIFFUSE;
LPDIRECT3DVERTEXBUFFER9 g_pVB;
bool g_vsb = true;
//定义g_HUD对话框上按钮ID
static const int IDC_TOGGLEFULLSCREEN=1;
static const int IDC_TOGGLEREF=2;
static const int IDC_CHANGEDEVICE=3;
HRESULT CALLBACK OnCreateDevice( IDirect3DDevice9* pd3dDevice, const D3DSURFACE_DESC* pBackBufferSurfaceDesc, void* pUserContext );
HRESULT CALLBACK OnResetDevice( IDirect3DDevice9* pd3dDevice, const D3DSURFACE_DESC* pBackBufferSurfaceDesc, void* pUserContext );
void CALLBACK OnFrameMove( IDirect3DDevice9* pd3dDevice, double fTime, float fElapsedTime, void* pUserContext );
void CALLBACK OnFrameRender( IDirect3DDevice9* pd3dDevice, double fTime, float fElapsedTime, void* pUserContext );
LRESULT CALLBACK MsgProc( HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam, bool* pbNoFurtherProcessing, void* pUserContext );
void CALLBACK KeyboardProc( UINT nChar, bool bKeyDown, bool bAltDown, void* pUserContext );
void CALLBACK OnGUIEvent( UINT nEvent, int nControlID, CDXUTControl* pControl, void* pUserContext );
void CALLBACK OnLostDevice( void* pUserContext );
void CALLBACK OnDestroyDevice( void* pUserContext );
void InitApp();
void RenderText();
INT WINAPI WinMain( HINSTANCE, HINSTANCE, LPSTR, int )
{
//为DEBUG模式激活运行时内存检查
#if defined(DEBUG) | defined(_DEBUG)
_CrtSetDbgFlag( _CRTDBG_ALLOC_MEM_DF | _CRTDBG_LEAK_CHECK_DF );
#endif
// 设置回调函数，这些函数允许DXUT通知应用程序更换设备，用户输入和窗口消息。
// 回调函数是可选的，因此你要做的仅是设置你感兴趣的事件的回调函数。
DXUTSetCallbackDeviceCreated( OnCreateDevice );
DXUTSetCallbackDeviceReset( OnResetDevice );
DXUTSetCallbackDeviceLost( OnLostDevice );
DXUTSetCallbackDeviceDestroyed( OnDestroyDevice );
DXUTSetCallbackFrameRender( OnFrameRender );
DXUTSetCallbackFrameMove( OnFrameMove );
DXUTSetCallbackMsgProc( MsgProc );
DXUTSetCallbackKeyboard( KeyboardProc );
// 全屏时显示鼠标
DXUTSetCursorSettings( true, true );
//InitApp();
// 初始化DXUT并创建想要的Win32窗口和应用程序的Direct3D设备。调用这些
// 可选函数中的每一个，此外它们允许你设置几个选项来控制框架的行为。
DXUTInit( TRUE, TRUE, TRUE );
DXUTCreateWindow( L"ameng" );
DXUTCreateDevice( D3DADAPTER_DEFAULT, TRUE, 640, 480 );
// 通过DXUT来处理消息循环并分派渲染调用。当在空闲时间和处理窗口消息的
// 时间间隔时，框架将调用OnFrameMove和OnFrameRender回调函数。
DXUTMainLoop();
return DXUTGetExitCode();
}
void InitApp()
{
// 初始化对话框
g_SettingsDlg.Init(&g_DialogResourceManager );
g_HUD.Init(&g_DialogResourceManager );
//设置对话框消息处理函数。
g_HUD.SetCallback( OnGUIEvent );
int iY = 10;
g_HUD.AddButton( IDC_TOGGLEFULLSCREEN, L"Toggle full screen", 35, iY, 125, 22 );
g_HUD.AddButton( IDC_TOGGLEREF, L"Toggle REF (F3)", 35, iY += 24, 125, 22,VK_F3 );
g_HUD.AddButton( IDC_CHANGEDEVICE, L"Change device (F2)", 35, iY += 24, 125, 22, VK_F2 );
}
HRESULT CALLBACK OnCreateDevice( IDirect3DDevice9* pd3dDevice, const D3DSURFACE_DESC* pBackBufferSurfaceDesc, void* pUserContext )
{
HRESULT hr;
V_RETURN( g_DialogResourceManager.OnCreateDevice( pd3dDevice ) );
InitApp();
V_RETURN( g_SettingsDlg.OnCreateDevice( 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 ) );
return S_OK;
}
HRESULT CALLBACK OnResetDevice( IDirect3DDevice9* pd3dDevice, const D3DSURFACE_DESC* pBackBufferSurfaceDesc, void* pUserContext )
{
HRESULT hr;
static CUSTOMVERTEX vertices[] =
  {
{ 300.0f, 50.0f, 0.1f, 1.0f, D3DCOLOR_ARGB(255,255,0,0) }, // x, y, z, rhw, color
{ 500.0f, 350.0f, 0.1f, 1.0f, D3DCOLOR_ARGB(255,0,255,0) },
{ 100.0f, 350.0f, 0.1f, 1.0f, D3DCOLOR_ARGB(255,0,0,255) },
 };
pd3dDevice->CreateVertexBuffer(3*sizeof(CUSTOMVERTEX),0,D3DFVF_CUSTOMVERTEX,D3DPOOL_DEFAULT,&g_pVB,NULL);
BYTE* pVertices;
if( FAILED( g_pVB->Lock( 0, sizeof(vertices), (void**)&pVertices, 0 )))
return E_FAIL;
memcpy(pVertices,vertices,sizeof(vertices));
g_pVB->Unlock();
V_RETURN( g_DialogResourceManager.OnResetDevice() );
V_RETURN( g_SettingsDlg.OnResetDevice() );
if( g_pFont )
V_RETURN( g_pFont->OnResetDevice() );
// Create a sprite to help batch calls when drawing many lines of text
V_RETURN( D3DXCreateSprite( pd3dDevice, &g_pTextSprite ) );
g_HUD.SetLocation( pBackBufferSurfaceDesc->Width-170, 0 );
g_HUD.SetSize( 170, 170 );
return S_OK;
}
void CALLBACK OnFrameMove( IDirect3DDevice9* pd3dDevice, double fTime, float fElapsedTime, void* pUserContext )
{
}
void CALLBACK OnFrameRender( IDirect3DDevice9* pd3dDevice, double fTime, float fElapsedTime, void* pUserContext )
{
HRESULT hr;
V( pd3dDevice->Clear(0, NULL, D3DCLEAR_TARGET | D3DCLEAR_ZBUFFER, D3DCOLOR_ARGB(0, 0, 0, 0), 1.0f, 0) );
V(pd3dDevice->SetStreamSource(0,g_pVB,0,sizeof(CUSTOMVERTEX)));
V(pd3dDevice->SetFVF(D3DFVF_CUSTOMVERTEX));
if( g_SettingsDlg.IsActive() )
{
g_SettingsDlg.OnRender( fElapsedTime );
return;
}
if(SUCCEEDED(pd3dDevice->BeginScene()))
{
//更新图像
V(pd3dDevice->DrawPrimitive(D3DPT_TRIANGLELIST,0,1));
if(g_vsb)
{
RenderText();
}
V( g_HUD.OnRender( fElapsedTime ) );
// V( g_SampleUI.OnRender( fElapsedTime ) );
pd3dDevice->EndScene();
}
}
void RenderText()
{
// The helper object simply helps keep track of text position, and color
// and then it calls pFont->DrawText( m_pSprite, strMsg, -1, &rc, DT_NOCLIP, m_clr );
// If NULL is passed in as the sprite object, then it will work however the
// pFont->DrawText() will not be batched together. Batching calls will improves performance.
CDXUTTextHelper txtHelper( g_pFont, g_pTextSprite, 15 );
// Output statistics
txtHelper.Begin();
txtHelper.SetInsertionPos( 5, 5 );
txtHelper.SetForegroundColor( D3DXCOLOR( 1.0f, 1.0f, 0.0f, 1.0f ) );
txtHelper.DrawTextLine( DXUTGetFrameStats(true) ); //为true 显现FPS，默认为false不显使FPS
txtHelper.DrawTextLine( DXUTGetDeviceStats() );
//TODO: add UI text as needed
txtHelper.SetForegroundColor( D3DXCOLOR( 1.0f, 1.0f, 1.0f, 1.0f ) );
txtHelper.DrawTextLine( L"Put whatever misc status here" );
// 获取图象后备缓冲区
const D3DSURFACE_DESC* pd3dsdBackBuffer = DXUTGetBackBufferSurfaceDesc();
if( g_bShowHelp )
{
txtHelper.SetInsertionPos( 10, pd3dsdBackBuffer->Height-15*6 );
txtHelper.SetForegroundColor( D3DXCOLOR( 1.0f, 0.75f, 0.0f, 1.0f ) );
txtHelper.DrawTextLine( L"Controls (F1 to hide):" );
txtHelper.SetInsertionPos( 40, pd3dsdBackBuffer->Height-15*5 );
txtHelper.DrawTextLine( L"Quit: ESC" );
}
else
{
//txtHelper.SetInsertionPos( 10, pd3dsdBackBuffer->Height-15*2 );
txtHelper.SetForegroundColor( D3DXCOLOR( 1.0f, 1.0f, 1.0f, 1.0f ) );
txtHelper.DrawTextLine( L"Press F1 for help" );
}
txtHelper.End();
}
//--------------------------------------------------------------------------------------
// Before handling window messages, DXUT passes incoming windows
// messages to the application through this callback function. If the application sets
// *pbNoFurtherProcessing to TRUE, then DXUT will not process this message.
//--------------------------------------------------------------------------------------
LRESULT CALLBACK MsgProc( HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam, bool* pbNoFurtherProcessing, void* pUserContext )
{
// Always allow dialog resource manager calls to handle global messages
// so GUI state is updated correctly
*pbNoFurtherProcessing = g_DialogResourceManager.MsgProc( hWnd, uMsg, wParam, lParam );
if( *pbNoFurtherProcessing )
return 0;
if( g_SettingsDlg.IsActive() )
{
g_SettingsDlg.MsgProc( hWnd, uMsg, wParam, lParam );
return 0;
}
// Give the dialogs a chance to handle the message first
*pbNoFurtherProcessing = g_HUD.MsgProc( hWnd, uMsg, wParam, lParam );
if( *pbNoFurtherProcessing )
return 0;
return 0;
}
//--------------------------------------------------------------------------------------
// As a convenience, DXUT inspects the incoming windows messages for
// keystroke messages and decodes the message parameters to pass relevant keyboard
// messages to the application. The framework does not remove the underlying keystroke
// messages, which are still passed to the application's MsgProc callback.
//--------------------------------------------------------------------------------------
void CALLBACK KeyboardProc( UINT nChar, bool bKeyDown, bool bAltDown, void* pUserContext )
{
if( bKeyDown )
{
switch( nChar )
{
case VK_F1:
g_bShowHelp = !g_bShowHelp;
break;
case VK_F4:
g_HUD.SetVisible(!g_HUD.GetVisible());
g_vsb = !g_vsb;
break;
default:
break;
}
}
}
//--------------------------------------------------------------------------------------
// Handles the GUI events
//--------------------------------------------------------------------------------------
void CALLBACK OnGUIEvent( UINT nEvent, int nControlID, CDXUTControl* pControl, void* pUserContext )
{
switch( nControlID )
{
case IDC_TOGGLEFULLSCREEN:
DXUTToggleFullScreen();
break;
case IDC_TOGGLEREF:
DXUTToggleREF();
break;
case IDC_CHANGEDEVICE:
g_SettingsDlg.SetActive( !g_SettingsDlg.IsActive() );
break;
}
}
void CALLBACK OnLostDevice( void* pUserContext )
{
if(g_pVB != NULL)
{
g_pVB->Release();
g_pVB = NULL;
}
g_DialogResourceManager.OnLostDevice();
g_SettingsDlg.OnLostDevice();
if( g_pFont )
g_pFont->OnLostDevice();
SAFE_RELEASE( g_pTextSprite );
}
void CALLBACK OnDestroyDevice( void* pUserContext )
{
g_DialogResourceManager.OnDestroyDevice();
g_SettingsDlg.OnDestroyDevice();
SAFE_RELEASE( g_pFont );
}
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