Direct3D进行Alpha混合实现半透明效果

// JCYWindow.cpp 我写的基于C++继承体系的窗口的类的实现 // 头文件 #include "JCYWindow.h" namespace JCY { #define SAFE_RELEASE( p ) if ( p ) { p->Release( ); p = NULL; } DWORD CDXBasicApp::s_windowState = WS_NORMAL; CDXBasicApp::CDXBasicApp( void ) // 默认构造函数 { m_bFullScreen = false; m_Width = 640; m_Height = 480; m_Style = WS_CAPTION | WS_SYSMENU | WS_MINIMIZEBOX; m_wndClass.lpfnWndProc = s_MessageHandler;// 消息函数赋值在默认构造函数，确保了基类能够访问基类的消息函数 } CDXBasicApp::~CDXBasicApp( void ) // 默认析构函数 { } bool CDXBasicApp::SetAttributes( HINSTANCE _hInst, HINSTANCE _hInstPrev, LPSTR _lpCmdLine, int _nCmdShow )// 设置属性 { m_hInst = _hInst; m_Width = 640; m_Height = 480; m_Style = WS_CAPTION | WS_SYSMENU | WS_MINIMIZEBOX; return true; } /*-------------------------------------------------------------*/ bool CDXBasicApp::SetSize( DWORD _Width, DWORD _Height )// 设置大小 { m_Width = _Width; m_Height = _Height; return true; } bool CDXBasicApp::SetStyle( DWORD _Style ) // 设置样式 { m_Style = _Style; return true; } bool CDXBasicApp::SetFullScreen( bool bFullScreen ) // 设置全屏 { m_bFullScreen = bFullScreen; if ( bFullScreen ) return SetStyle( WS_EX_TOPMOST | WS_POPUP | WS_VISIBLE ); else return SetStyle( WS_CAPTION | WS_SYSMENU | WS_MINIMIZEBOX ); } // 默认消息函数 LRESULT WINAPI CDXBasicApp::s_MessageHandler( HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam ) { switch( msg ) { case WM_KEYDOWN: if ( wParam == VK_ESCAPE ) PostQuitMessage( 0 ); return 0; case WM_DESTROY: PostQuitMessage( 0 ); return 0; case WM_SIZE: if ( wParam == SIZE_MINIMIZED ) s_windowState = WS_MINIMIZED; else s_windowState = WS_NOMALIZED; break; case WM_KILLFOCUS: s_windowState = WS_LOSTFOCUS; break; case WM_SETFOCUS: s_windowState = WS_GETFOCUS; } return DefWindowProc( hWnd, msg, wParam, lParam ); } /*-------------------------------------------------------------*/ bool CDXBasicApp::Initialize( TCHAR* caption ) // 初始化函数 { OnPreInitialize( ); // 设置成员m_wndClass的属性 m_wndClass.cbSize = sizeof( m_wndClass ); m_wndClass.style = CS_CLASSDC; m_wndClass.cbClsExtra = 0L; m_wndClass.cbWndExtra = 0L; m_wndClass.hInstance = m_hInst; m_wndClass.hIcon = LoadIcon( NULL, IDI_APPLICATION ); m_wndClass.hCursor = LoadCursor( NULL, IDC_ARROW ); m_wndClass.hbrBackground = NULL; m_wndClass.lpszMenuName = NULL; m_wndClass.lpszClassName = caption; m_wndClass.hIconSm = LoadIcon( NULL, IDI_APPLICATION ); RegisterClassEx( &m_wndClass );// 注册成员wndClass if ( m_bFullScreen ) { m_hWnd = CreateWindow( // 创建窗口 caption, caption, m_Style, CW_USEDEFAULT, CW_USEDEFAULT, m_Width, m_Height, GetDesktopWindow(), NULL, m_hInst, NULL ); } else { m_hWnd = CreateWindow( // 创建窗口 caption, caption, m_Style, CW_USEDEFAULT, CW_USEDEFAULT, m_Width + 6, m_Height + 32, GetDesktopWindow(), NULL, m_hInst, NULL ); } if ( m_hWnd == NULL ) Throw( "无法创建窗口。" ); // 窗口句柄为空则错误 HRESULT hr; //创建D3D对象 m_pD3D = Direct3DCreate9( D3D_SDK_VERSION ); if ( m_pD3D == NULL ) Throw( "创建D3D对象失败。" ); // 获取显示器的模式 D3DDISPLAYMODE displayMode; hr = m_pD3D->GetAdapterDisplayMode( D3DADAPTER_DEFAULT, &displayMode ); ThrowIfFailed( hr, "获取显示器的模式失败。" ); ZeroMemory( &m_D3dpp, sizeof( m_D3dpp ) ); m_D3dpp.Windowed = !m_bFullScreen; m_D3dpp.BackBufferWidth = m_Width; m_D3dpp.BackBufferHeight = m_Height; m_D3dpp.SwapEffect = D3DSWAPEFFECT_DISCARD; m_D3dpp.BackBufferFormat = displayMode.Format; m_D3dpp.EnableAutoDepthStencil = TRUE; m_D3dpp.AutoDepthStencilFormat = D3DFMT_D16; m_D3dpp.PresentationInterval = D3DPRESENT_DONOTWAIT; // 这个标识符很重要，它可以让窗口不会等待管道线，可以很流畅的运动 m_D3dpp.hDeviceWindow = m_hWnd; // 创建设备 hr = m_pD3D->CreateDevice( D3DADAPTER_DEFAULT, D3DDEVTYPE_HAL, m_hWnd, D3DCREATE_SOFTWARE_VERTEXPROCESSING, &m_D3dpp, &m_pDevice ); ThrowIfFailed( hr, "创建设备失败。" ); ShowWindow( m_hWnd, SW_SHOWDEFAULT );// 显示窗口 UpdateWindow( m_hWnd );// 更新窗口 return OnPostInitialize( ); } bool CDXBasicApp::Run( void ) // 运行 { // 进入框架内部运行消息循环 MSG msg; PeekMessage( &msg, NULL, 0U, 0U, PM_REMOVE ); while( msg.message != WM_QUIT ) { // 处理消息 if ( PeekMessage( &msg, NULL, 0U, 0U, PM_REMOVE ) ) { TranslateMessage( &msg ); DispatchMessage( &msg ); } else { switch( s_windowState ) { case WS_GETFOCUS:// 获得焦点 OnGetFocus( ); s_windowState = WS_NORMAL; break; case WS_NOMALIZED:// 恢复正常 OnNormalize( ); s_windowState = WS_NORMAL; break; case WS_NORMAL:// 正常渲染 OnPreRender( );// 渲染前动作 Render( );// 渲染 if ( !OnPostRender( ) )// 渲染之后的操作 { OnPreReset( ); Reset( ); OnPostReset( ); } break; case WS_MINIMIZED:// 最小化 OnMinimized( ); WaitMessage( );// 为了解决最小化时CPU占用高的问题，设立这条语句，即只等待消息 break; case WS_QUIT:// 退出 return 0;// 退出，同时所有线程也结束了 case WS_LOSTFOCUS:// 失去焦点 OnLostFocus( ); } } } OnPreTerminate( ); Terminate( ); OnPostTerminate( ); return true; } bool CDXBasicApp::Reset( void ) // 重置 { HRESULT hr; hr = m_pDevice->Reset( &m_D3dpp ); ThrowIfFailed( hr, "糟糕了，我们怎样重置也无济于事，这该怎么办呢。\n看来只好找游戏的开发者了。" ); ShowWindow( m_hWnd, SW_SHOWDEFAULT );// 显示窗口 UpdateWindow( m_hWnd );// 更新窗口 return true; } bool CDXBasicApp::Terminate( void ) // 结束的函数 { SAFE_RELEASE( m_pDevice ); SAFE_RELEASE( m_pD3D ); UnregisterClass( m_wndClass.lpszClassName, m_hInst ); return true; } /*-------------------------------------------------------------*/ bool CDXBasicApp::OnPreRender( void ) // 渲染之前的操作 { m_pDevice->Clear( 0, NULL, D3DCLEAR_TARGET | D3DCLEAR_ZBUFFER, D3DCOLOR_XRGB( 30, 216, 7 ), 1.0f, 0);// 清除后台缓存 m_pDevice->BeginScene( ); return true; } bool CDXBasicApp::OnPostRender( void ) // 渲染之后的操作 { HRESULT hr; MSG msg; m_pDevice->EndScene( ); m_pDevice->Present( NULL, NULL, NULL, NULL );// 显示 hr = m_pDevice->TestCooperativeLevel( ); if ( FAILED( hr ) ) { ShowWindow( m_hWnd, SW_MINIMIZE );// 显示窗口 UpdateWindow( m_hWnd );// 更新窗口 while ( hr == D3DERR_DEVICELOST ) { Sleep( 50 ); // 防止内存占用过高 PeekMessage( &msg, NULL, 0U, 0U, PM_REMOVE ); TranslateMessage( &msg ); DispatchMessage( &msg ); hr = m_pDevice->TestCooperativeLevel( ); } if ( hr == D3DERR_DEVICENOTRESET ) return false; else ThrowIfFailed( hr, "不可能啊。设备丢失了...我也不知道原因。不过系统是这么说的：" ); } return true; } bool CDXBasicApp::OnLostFocus( void ) // 失去焦点的操作 { m_pDevice->Present( NULL, NULL, NULL, NULL );// 显示 return true; } bool CDXBasicApp::OnMinimized( void ){ return true; } // 最小化的操作 bool CDXBasicApp::OnGetFocus( void ){ return true; } // 获得焦点的操作 bool CDXBasicApp::OnNormalize( void ){ return true; } // 最小化恢复操作 bool CDXBasicApp::OnPreInitialize( void ){ return true; } // 初始化之前的操作 bool CDXBasicApp::OnPostInitialize( void ){ return true; } // 初始化之后的操作 bool CDXBasicApp::OnPreReset( void ){ return true; } // 恢复设备之前的操作 bool CDXBasicApp::OnPostReset( void ){ return true