D3D渲染到纹理

 1 #include <d3dx9.h> 2  3 //----------------------------------------------------------------------------- 4 // Desc: 全局变量 5 //----------------------------------------------------------------------------- 6 LPDIRECT3D9 g_pD3D = NULL; //Direct3D对象 7 LPDIRECT3DDEVICE9 g_pd3dDevice = NULL; //Direct3D设备对象 8 LPDIRECT3DVERTEXBUFFER9 g_pVB = NULL; //顶点缓冲区对象 9 LPDIRECT3DTEXTURE9 g_pTexture = NULL; //纹理对象 10  11 LPDIRECT3DTEXTURE9 g_pRender2Tex = NULL; 12 LPDIRECT3DSURFACE9 g_pRenderSur = NULL; 13 LPDIRECT3DSURFACE9 g_pBackupSur = NULL; 14  15 //----------------------------------------------------------------------------- 16 // Desc: 顶点结构 17 //----------------------------------------------------------------------------- 18 struct CUSTOMVERTEX 19 { 20 FLOAT x, y, z; //顶点位置  21 FLOAT u,v ; //顶点纹理坐标 22 }; 23 #define D3DFVF_CUSTOMVERTEX (D3DFVF_XYZ|D3DFVF_TEX1) 24  25  26 //----------------------------------------------------------------------------- 27 // Desc: 设置变换矩阵 28 //----------------------------------------------------------------------------- 29 VOID SetupMatrices() 30 { 31 //创建并设置世界矩阵 32  D3DXMATRIXA16 matWorld; 33 D3DXMatrixIdentity( &matWorld ); 34 g_pd3dDevice->SetTransform( D3DTS_WORLD, &matWorld ); 35  36 //创建并设置观察矩阵 37 D3DXVECTOR3 vEyePt( 0.0f, 0.0f, -10 ); 38 D3DXVECTOR3 vLookatPt( 0.0f, 0.0f, 0.0f ); 39 D3DXVECTOR3 vUpVec( 0.0f, 1.0f, 0.0f ); 40  D3DXMATRIXA16 matView; 41 D3DXMatrixLookAtLH( &matView, &vEyePt, &vLookatPt, &vUpVec ); 42 g_pd3dDevice->SetTransform( D3DTS_VIEW, &matView ); 43  44 //创建并设置投影矩阵 45  D3DXMATRIXA16 matProj; 46 D3DXMatrixPerspectiveFovLH( &matProj, D3DX_PI/4, 1.0f, 1.0f, 100.0f ); 47 g_pd3dDevice->SetTransform( D3DTS_PROJECTION, &matProj ); 48 } 49  50  51 //----------------------------------------------------------------------------- 52 // Desc: 初始化Direct3D 53 //----------------------------------------------------------------------------- 54 HRESULT InitD3D( HWND hWnd ) 55 { 56 //创建Direct3D对象, 该对象用于创建Direct3D设备对象 57 if( NULL == ( g_pD3D = Direct3DCreate9( D3D_SDK_VERSION ) ) ) 58 return E_FAIL; 59  60 //设置D3DPRESENT_PARAMETERS结构, 准备创建Direct3D设备对象 61  D3DPRESENT_PARAMETERS d3dpp; 62 ZeroMemory( &d3dpp, sizeof(d3dpp) ); 63 d3dpp.Windowed = TRUE; 64 d3dpp.SwapEffect = D3DSWAPEFFECT_DISCARD; 65 d3dpp.BackBufferFormat = D3DFMT_X8R8G8B8; 66  67 //创建Direct3D设备对象 68 if( FAILED( g_pD3D->CreateDevice( D3DADAPTER_DEFAULT, D3DDEVTYPE_HAL, hWnd, 69  D3DCREATE_SOFTWARE_VERTEXPROCESSING, 70 &d3dpp, &g_pd3dDevice ) ) ) 71  { 72 return E_FAIL; 73  } 74  75 //禁用照明效果 76 g_pd3dDevice->SetRenderState( D3DRS_LIGHTING, FALSE );  77  78 //设置变换矩阵 79  SetupMatrices(); 80  81 HRESULT hr = g_pd3dDevice->CreateTexture(256,256,1,D3DUSAGE_RENDERTARGET, 82 D3DFMT_X8R8G8B8, D3DPOOL_DEFAULT, &g_pRender2Tex, NULL); 83 if (FAILED(hr)) 84  { 85 return E_FAIL; 86  } 87 g_pRender2Tex->GetSurfaceLevel(0, &g_pRenderSur); 88  89 return S_OK; 90 } 91  92  93 //----------------------------------------------------------------------------- 94 // Desc: 创建场景图形 95 //----------------------------------------------------------------------------- 96 HRESULT InitGriphics() 97 { 98 //创建纹理对象 99 if( FAILED( D3DXCreateTextureFromFile( g_pd3dDevice, L"texture.jpg", &g_pTexture ) ) )100  {101 MessageBox(NULL, L"创建纹理失败", L"Texture.exe", MB_OK);102 return E_FAIL;103  }104 105 //顶点数据106 CUSTOMVERTEX g_Vertices[] =107  {108 { -3, -3, 0.0f, 0.0f, 1.0f}, 109 { -3, 3, 0.0f, 0.0f, 0.0f}, 110 { 3, -3, 0.0f, 1.0f, 1.0f}, 111 { 3, 3, 0.0f, 1.0f, 0.0f }112 113  };114 115 //创建顶点缓冲区116 if( FAILED( g_pd3dDevice->CreateVertexBuffer( 4*sizeof(CUSTOMVERTEX),117 0, D3DFVF_CUSTOMVERTEX,118 D3DPOOL_MANAGED, &g_pVB,NULL ) ) )119  {120 return E_FAIL;121  }122 123 //填充顶点缓冲区124 VOID* pVertices;125 if( FAILED( g_pVB->Lock( 0, sizeof(g_Vertices), (void**)&pVertices, 0 ) ) )126 return E_FAIL;127 memcpy( pVertices, g_Vertices, sizeof(g_Vertices) );128 g_pVB->Unlock();129 130 return S_OK;131 }132 133 134 //-----------------------------------------------------------------------------135 // Desc: 释放创建的对象136 //-----------------------------------------------------------------------------137 VOID Cleanup()138 {139 //释放纹理对象140 if( g_pTexture != NULL )141 g_pTexture->Release();142 143 //释放顶点缓冲区对象144 if( g_pVB != NULL ) 145 g_pVB->Release();146 147 //释放Direct3D设备对象148 if( g_pd3dDevice != NULL ) 149 g_pd3dDevice->Release();150 151 //释放Direct3D对象152 if( g_pD3D != NULL ) 153 g_pD3D->Release();154 }155 156 157 //-----------------------------------------------------------------------------158 // Desc: 渲染图形 159 //-----------------------------------------------------------------------------160 VOID Render()161 {162 //清空后台缓冲区163 g_pd3dDevice->Clear( 0, NULL, D3DCLEAR_TARGET, D3DCOLOR_XRGB(45, 50, 170), 1.0f, 0 );164 165 //开始在后台缓冲区绘制图形166 if( SUCCEEDED( g_pd3dDevice->BeginScene() ) )167  {168 g_pd3dDevice->GetRenderTarget(0, &g_pBackupSur);169 g_pd3dDevice->SetRenderTarget(0, g_pRenderSur);170 171 /*RTT*/172 g_pd3dDevice->Clear( 0, NULL, D3DCLEAR_TARGET, D3DCOLOR_XRGB(0, 0, 0), 1.0f, 0 );173 g_pd3dDevice->SetTexture( 0, g_pTexture ); //设置纹理174 g_pd3dDevice->SetStreamSource( 0, g_pVB, 0, sizeof(CUSTOMVERTEX) );175 g_pd3dDevice->SetFVF( D3DFVF_CUSTOMVERTEX );176 g_pd3dDevice->DrawPrimitive( D3DPT_TRIANGLESTRIP, 0, 2);177 178 D3DXSaveTextureToFileA("tt.tga", D3DXIFF_TGA, g_pRender2Tex, NULL);179 180 /*真是场景*/181 g_pd3dDevice->SetRenderTarget(0, g_pBackupSur);182 183 g_pd3dDevice->SetTexture( 0, g_pTexture ); //设置纹理184 g_pd3dDevice->SetStreamSource( 0, g_pVB, 0, sizeof(CUSTOMVERTEX) );185 g_pd3dDevice->SetFVF( D3DFVF_CUSTOMVERTEX );186 g_pd3dDevice->DrawPrimitive( D3DPT_TRIANGLESTRIP, 0, 2);187 188 189 //结束在后台缓冲区绘制图形190 g_pd3dDevice->EndScene();191  }192 193 //将在后台缓冲区绘制的图形提交到前台缓冲区显示194 g_pd3dDevice->Present( NULL, NULL, NULL, NULL );195 }196 197 198 //-----------------------------------------------------------------------------199 // Desc: 消息处理200 //-----------------------------------------------------------------------------201 LRESULT WINAPI MsgProc( HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam )202 {203 switch( msg )204  {205 case WM_DESTROY:206  Cleanup();207 PostQuitMessage( 0 );208 return 0;209  }210 211 return DefWindowProc( hWnd, msg, wParam, lParam );212 }213 214 215 216 //-----------------------------------------------------------------------------217 // Desc: 入口函数218 //-----------------------------------------------------------------------------219 INT WINAPI WinMain( HINSTANCE hInst, HINSTANCE, LPSTR, INT )220 {221 222 //注册窗口类223 WNDCLASSEX wc = { sizeof(WNDCLASSEX), CS_CLASSDC, MsgProc, 0L, 0L,224  GetModuleHandle(NULL), NULL, NULL, NULL, NULL,225 L"ClassName", NULL };226 RegisterClassEx( &wc );227 228 //创建窗口229 HWND hWnd = CreateWindow( L"ClassName", L"纹理影射基础",230 WS_OVERLAPPEDWINDOW, 200, 100, 800, 600,231  GetDesktopWindow(), NULL, wc.hInstance, NULL );232 233 //初始化Direct3D234 if( SUCCEEDED( InitD3D( hWnd ) ) )235  {236 //创建场景图形237 if( SUCCEEDED( InitGriphics() ) )238  {239 //显示窗口240  ShowWindow( hWnd, SW_SHOWDEFAULT );241  UpdateWindow( hWnd );242 243 //进入消息循环244  MSG msg;245 ZeroMemory( &msg, sizeof(msg) );246 while( msg.message!=WM_QUIT )247  {248 if( PeekMessage( &msg, NULL, 0U, 0U, PM_REMOVE ) )249  {250 TranslateMessage( &msg );251 DispatchMessage( &msg );252  }253 else254  {255 Render(); //渲染图形256  }257  }258  }259  }260 261 UnregisterClass( L"ClassName", wc.hInstance );262 return 0;263 }