font_2d.cpp

DX例子中等难度的。全是新例子。VC2003

//=============================================================================
// Desc: 二维字体
//=============================================================================
#include <d3d9.h>
#include <D3dx9core.h>


//-----------------------------------------------------------------------------
// Desc: 全局变量
//-----------------------------------------------------------------------------
LPDIRECT3D9             g_pD3D       = NULL;    //Direct3D对象
LPDIRECT3DDEVICE9       g_pd3dDevice = NULL;    //Direct3D设备对象
LPD3DXFONT              g_pFont      = 0;       //字体对象
WCHAR*                  strText      = L"Welcome Direct3D!";
RECT                    clientRect;


//-----------------------------------------------------------------------------
// Desc: 初始化Direct3D
//-----------------------------------------------------------------------------
HRESULT InitD3D( HWND hWnd )
{
	//创建Direct3D对象, 该对象用于创建Direct3D设备对象
    if( NULL == ( g_pD3D = Direct3DCreate9( D3D_SDK_VERSION ) ) )
        return E_FAIL;

	//设置D3DPRESENT_PARAMETERS结构, 准备创建Direct3D设备对象
    D3DPRESENT_PARAMETERS d3dpp; 
    ZeroMemory( &d3dpp, sizeof(d3dpp) );
    d3dpp.Windowed = TRUE;
    d3dpp.SwapEffect = D3DSWAPEFFECT_DISCARD;
    d3dpp.BackBufferFormat = D3DFMT_UNKNOWN;

	//创建Direct3D设备对象
    if( FAILED( g_pD3D->CreateDevice( D3DADAPTER_DEFAULT, D3DDEVTYPE_HAL, hWnd,
                                      D3DCREATE_SOFTWARE_VERTEXPROCESSING,
                                      &d3dpp, &g_pd3dDevice ) ) )
    {
        return E_FAIL;
    }

	//创建字体对象
	if (FAILED(D3DXCreateFont(g_pd3dDevice,0,0,0,
		                      0,0,0,0,0,0, L"Arial", &g_pFont)))
		  return E_FAIL;

	//获取窗口客户区
	GetClientRect(hWnd, &clientRect);

	return S_OK;
}


//-----------------------------------------------------------------------------
// Desc: 释放创建的对象
//-----------------------------------------------------------------------------
VOID Cleanup()
{
	//释放字体对象
	if(g_pFont != NULL)
		g_pFont->Release();

	//释放Direct3D设备对象
    if( g_pd3dDevice != NULL) 
        g_pd3dDevice->Release();

	//释放Direct3D对象
    if( g_pD3D != NULL)
        g_pD3D->Release();
}


//-----------------------------------------------------------------------------
// Desc: 渲染图形 
//-----------------------------------------------------------------------------
VOID Render()
{
   //清空后台缓冲区
    g_pd3dDevice->Clear( 0, NULL, D3DCLEAR_TARGET, D3DCOLOR_XRGB(45, 50, 170), 1.0f, 0 );
    
	//开始在后台缓冲区绘制图形
    if( SUCCEEDED( g_pd3dDevice->BeginScene() ) )
    {
		//在后台缓冲区绘制图形
		g_pFont->DrawText(NULL, strText, (int)wcslen(strText), &clientRect,
			              DT_SINGLELINE|DT_NOCLIP|DT_CENTER|DT_VCENTER, 0xffffffff);

		//结束在后台缓冲区绘制图形
        g_pd3dDevice->EndScene();
    }

	//将在后台缓冲区绘制的图形提交到前台缓冲区显示
    g_pd3dDevice->Present( NULL, NULL, NULL, NULL );
}


//-----------------------------------------------------------------------------
// Desc: 消息处理
//-----------------------------------------------------------------------------
LRESULT WINAPI MsgProc( HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam )
{
    switch( msg )
    {
        case WM_DESTROY:
			Cleanup();
            PostQuitMessage( 0 );
            return 0;
    }

    return DefWindowProc( hWnd, msg, wParam, lParam );
}


//-----------------------------------------------------------------------------
// Desc: 入口函数
//-----------------------------------------------------------------------------
int WINAPI WinMain( HINSTANCE hInst, HINSTANCE, LPSTR, INT )
{
	//注册窗口类
    WNDCLASSEX wc = { sizeof(WNDCLASSEX), CS_CLASSDC, MsgProc, 0L, 0L, 
                      GetModuleHandle(NULL), NULL, NULL, NULL, NULL,
                      L"ClassName", NULL };
    RegisterClassEx( &wc );

	//创建窗口
    HWND hWnd = CreateWindow( L"ClassName", L"二维字体", 
                              WS_OVERLAPPEDWINDOW, 200, 100, 400, 360,
                              GetDesktopWindow(), NULL, wc.hInstance, NULL );

	//初始化Direct3D
	if( SUCCEEDED( InitD3D( hWnd ) ) )
	{ 
		//显示窗口
		ShowWindow( hWnd, SW_SHOWDEFAULT );
		UpdateWindow( hWnd );

		//进入消息循环
		MSG msg;
		ZeroMemory( &msg, sizeof(msg) );
		while( msg.message!=WM_QUIT )
		{
			if( PeekMessage( &msg, NULL, 0U, 0U, PM_REMOVE ) )
			{
				TranslateMessage( &msg );
				DispatchMessage( &msg );
			}
			else
			{
				Render();  //渲染图形
			}
		}
	}
	
    UnregisterClass( L"ClassName", wc.hInstance );
    return 0;
}