分类： C/C++
2008-06-20 16:12:44
#include < string > typedef std:: string String; #define SAFE_RELEASE(o) {if(o){o->Release();o = 0;}} LPDIRECT3D9 g_pD3D = 0 ; // D3D Driver LPDIRECT3DDEVICE9 g_pd3dDevice = 0 ; // D3D 设备 
D3DCAPS9 g_Caps = 
{(D3DDEVTYPE) 0 } ; // D3D 的帽子 LPD3DXMESH g_pMeshTeapot = 0 ; // 茶壶顶点缓冲区 LPDIRECT3DVERTEXBUFFER9 g_pVB = 0 ; // 顶点缓冲区 LPDIRECT3DINDEXBUFFER9 g_pIB = 0 ; // 索引缓冲区 LPDIRECT3DTEXTURE9 g_pTexture = 0 ; // 贴图 LPDIRECT3DTEXTURE9 g_pRenderTexture = 0 ; // 渲染到贴图 LPDIRECT3DSURFACE9 g_pRenderSurface = 0 ; // 渲染到贴图的表面 // 顶点定义 #define D3DFVF_CUSTOMVERTEX (D3DFVF_XYZ | D3DFVF_DIFFUSE | D3DFVF_TEX1) struct CUSTOMVERTEX {
D3DXVECTOR3 position; D3DCOLOR color; float u , v;
} ; // 错误记录 void D3DErr(String strMsg) { MessageBox( 0 , strMsg.c_str() , " 错误 " , MB_OK);} // 初始化顶点缓冲区 HRESULT InitVB() { // 创建茶壶 if (FAILED(D3DXCreateTeapot(g_pd3dDevice , & g_pMeshTeapot , 0 ))) return E_FAIL; // 创建顶点缓冲区 if (FAILED(g_pd3dDevice -> CreateVertexBuffer( 4 * sizeof (CUSTOMVERTEX) , 0 , D3DFVF_CUSTOMVERTEX , D3DPOOL_DEFAULT , & g_pVB , 0 ))) return E_FAIL; CUSTOMVERTEX * pVertecies; // 锁定缓冲区 if (SUCCEEDED(g_pVB -> Lock( 0 , 0 , ( void ** ) & pVertecies , 0 )))
{ pVertecies[ 0 ].position = D3DXVECTOR3( - 1 , 1 , 0 ); pVertecies[ 1 ].position = D3DXVECTOR3( - 1 , - 1 , 0 ); pVertecies[ 2 ].position = D3DXVECTOR3( 1 , 1 , 0 ); pVertecies[ 3 ].position = D3DXVECTOR3( 1 , - 1 , 0 ); pVertecies[ 0 ].u = 0 ; pVertecies[ 0 ].v = 0 ; pVertecies[ 1 ].u = 0 ; pVertecies[ 1 ].v = 1 ; pVertecies[ 2 ].u = 1 ; pVertecies[ 2 ].v = 0 ; pVertecies[ 3 ].u = 1 ; pVertecies[ 3 ].v = 1 ; pVertecies[ 0 ].color = 0xFFFFFFFF ; pVertecies[ 1 ].color = 0xFFFFFFFF ; pVertecies[ 2 ].color = 0xFFFFFFFF ; pVertecies[ 3 ].color = 0xFFFFFFFF ; g_pVB -> Unlock();
} else { return E_FAIL; } // 载入纹理 if (FAILED(D3DXCreateTextureFromFile(g_pd3dDevice , " ..\\BRICE.JPG " , & g_pTexture))) { D3DErr( " 无法载入纹理Brice.jpg " ); return E_FAIL; } // 创建渲染到贴图的表面 if (FAILED(g_pd3dDevice -> CreateTexture( 512 , 512 , 1 , D3DUSAGE_RENDERTARGET , D3DFMT_A8R8G8B8 , D3DPOOL_DEFAULT , & g_pRenderTexture , 0 ))) { D3DErr( " 无法创建渲染贴图 " ); return E_FAIL; } // 获取贴图的渲染表面 if (FAILED(g_pRenderTexture -> GetSurfaceLevel( 0 , & g_pRenderSurface))) { return E_FAIL; } return S_OK;} // 初始化模型 HRESULT InitGeometry() { // 创建顶点缓冲区 if (FAILED(InitVB())) return E_FAIL; return S_OK;} // 设置矩阵变换 void SetTransform() { // 世界变换 D3DXMATRIX matWorld; D3DXMatrixIdentity( & matWorld); // 设置世界矩阵 g_pd3dDevice -> SetTransform(D3DTS_WORLD , & matWorld); // Set up our view matrix. A view matrix can be defined given an eye point, // a point to lookat, and a direction for which way is up. Here, we set the // eye five units back along the z-axis and up three units, look at the // origin, and define "up" to be in the y-direction. // 视口变换 D3DXMATRIX matView; D3DXMatrixLookAtLH( & matView , & D3DXVECTOR3( 0 , 0 , - 5 ) , & D3DXVECTOR3( 0 , 0 , 0 ) , & D3DXVECTOR3( 0 , 1 , 0 )); g_pd3dDevice -> SetTransform(D3DTS_VIEW , & matView); // For the projection matrix, we set up a perspective transform (which // transforms geometry from 3D view space to 2D viewport space, with // a perspective divide making objects smaller in the distance). To build // a perpsective transform, we need the field of view (1/4 pi is common), // the aspect ratio, and the near and far clipping planes (which define at // what distances geometry should be no longer be rendered). D3DXMATRIXA16 matProj; D3DXMatrixPerspectiveFovLH( & matProj, D3DX_PI / 4 , 800.0f / 600.0f , 1.0f , 100.0f ); g_pd3dDevice -> SetTransform( D3DTS_PROJECTION, & matProj );} // 渲染场景 void Render() { if (g_pd3dDevice) { LPDIRECT3DSURFACE9 pRenderTarget; // 保存渲染表面 g_pd3dDevice -> GetRenderTarget( 0 , & pRenderTarget); // 设置我们的贴图表面 g_pd3dDevice -> SetRenderTarget( 0 , g_pRenderSurface); // 清空场景，渲染到贴图的背景是蓝色的 g_pd3dDevice -> Clear( 0 , 0 , D3DCLEAR_TARGET | D3DCLEAR_ZBUFFER , D3DCOLOR_XRGB( 0 , 0 , 0xFF ) , 1 , 0 ); // 开始渲染到贴图 if (SUCCEEDED(g_pd3dDevice -> BeginScene())) { // 设置通常的矩阵 SetTransform(); D3DXMATRIX matWorld; // 旋转茶壶 D3DXMatrixRotationAxis( & matWorld , & D3DXVECTOR3( 1 , 0 , 1 ) , D3DX_PI * 2.0f * (timeGetTime() % 5000 ) / 5000.0f ); g_pd3dDevice -> SetTransform(D3DTS_WORLD , & matWorld); // 设置渲染到表面的投影矩阵（这里可有可无，因为我们的窗口创建是512×512的） D3DXMATRIXA16 matProj; D3DXMatrixPerspectiveFovLH( & matProj, D3DX_PI / 4 , 1.0f , 1.0f , 100.0f ); g_pd3dDevice -> SetTransform( D3DTS_PROJECTION, & matProj ); // 设置贴图 g_pd3dDevice -> SetTexture( 0 , g_pTexture); g_pd3dDevice -> SetSamplerState( 0 , D3DSAMP_ADDRESSU , D3DTADDRESS_MIRROR); g_pd3dDevice -> SetSamplerState( 0 , D3DSAMP_ADDRESSV , D3DTADDRESS_MIRROR); // 自动生成纹理坐标 g_pd3dDevice -> SetTextureStageState( 0 , D3DTSS_TEXTURETRANSFORMFLAGS, D3DTTFF_COUNT2); g_pd3dDevice -> SetTextureStageState( 0 , D3DTSS_TEXCOORDINDEX, D3DTSS_TCI_SPHEREMAP); g_pd3dDevice -> SetRenderState(D3DRS_LIGHTING , FALSE); // 渲染茶壶 g_pMeshTeapot -> DrawSubset( 0 ); g_pd3dDevice -> EndScene(); } // 恢复渲染表面为显示器 g_pd3dDevice -> SetRenderTarget( 0 , pRenderTarget); // 清空场景，真实场景是红色背景的 g_pd3dDevice -> Clear( 0 , 0 , D3DCLEAR_TARGET | D3DCLEAR_ZBUFFER , D3DCOLOR_XRGB( 0xFF , 0xFF , 0 ) , 1 , 0 ); // 开始渲染真实场景 if (SUCCEEDED(g_pd3dDevice -> BeginScene())) { SetTransform(); D3DXMATRIX matWorld; // 旋转表面 D3DXMatrixRotationAxis( & matWorld , & D3DXVECTOR3( 1 , 1 , 0 ) , sinf(D3DX_PI * 2.0f * (timeGetTime() % 5000 ) / 5000.0f )); // 设置世界矩阵 g_pd3dDevice -> SetTransform(D3DTS_WORLD , & matWorld); // 设置已经渲染到表面的贴图 g_pd3dDevice -> SetTexture( 0 , g_pRenderTexture); g_pd3dDevice -> SetTextureStageState( 0 , D3DTSS_TEXTURETRANSFORMFLAGS, D3DTTFF_COUNT2); g_pd3dDevice -> SetTextureStageState( 0 , D3DTSS_TEXCOORDINDEX, 0 ); g_pd3dDevice -> SetSamplerState( 0 , D3DSAMP_ADDRESSU , D3DTADDRESS_MIRROR); g_pd3dDevice -> SetSamplerState( 0 , D3DSAMP_ADDRESSV , D3DTADDRESS_MIRROR); g_pd3dDevice -> SetRenderState(D3DRS_LIGHTING , FALSE); // g_pd3dDevice->SetRenderState(D3DRS_FILLMODE , D3DFILL_WIREFRAME); g_pd3dDevice -> SetStreamSource( 0 , g_pVB , 0 , sizeof (CUSTOMVERTEX)); g_pd3dDevice -> SetFVF(D3DFVF_CUSTOMVERTEX); g_pd3dDevice -> DrawPrimitive(D3DPT_TRIANGLESTRIP , 0 , 2 ); g_pd3dDevice -> EndScene(); } // 显示 g_pd3dDevice -> Present( 0 , 0 , 0 , 0 ); } } // 初始化 D3D 设备 HRESULT InitD3D(HWND hWnd) { // 创建 D3D Driver if (NULL == (g_pD3D = Direct3DCreate9(D3D_SDK_VERSION))) { D3DErr( " 无法创建Direct3D9设备 " ); return E_FAIL; } // 获取当前显示模式 D3DDISPLAYMODE d3ddm; if (FAILED(g_pD3D -> GetAdapterDisplayMode(D3DADAPTER_DEFAULT , & d3ddm))) { D3DErr( " 无法获取D3D显示器模式 " ); return E_FAIL; } RECT rect; ::GetClientRect(hWnd , & rect); // 填充参数 D3DPRESENT_PARAMETERS d3dpp; memset( & d3dpp , 0 , sizeof (d3dpp)); d3dpp.BackBufferFormat = d3ddm.Format; d3dpp.BackBufferWidth = rect.right; d3dpp.BackBufferHeight = rect.bottom; d3dpp.SwapEffect = D3DSWAPEFFECT_DISCARD; d3dpp.Windowed = true ; d3dpp.AutoDepthStencilFormat = D3DFMT_D16; d3dpp.EnableAutoDepthStencil = TRUE; // 获取帽子 if (FAILED(g_pD3D -> GetDeviceCaps(D3DADAPTER_DEFAULT , D3DDEVTYPE_HAL , & g_Caps))) { D3DErr( " 获取D3D 帽子时发生错误 " ); return E_FAIL; } // 创建D3D设备 if (FAILED(g_pD3D -> CreateDevice(D3DADAPTER_DEFAULT , D3DDEVTYPE_HAL , hWnd // 检查是否支持硬件顶点处理 , g_Caps.DevCaps & D3DDEVCAPS_HWTRANSFORMANDLIGHT ? D3DCREATE_HARDWARE_VERTEXPROCESSING : D3DCREATE_SOFTWARE_VERTEXPROCESSING , & d3dpp , & g_pd3dDevice ) )) { D3DErr( " 创建D3D设备时发生错误 " ); return E_FAIL; } g_pd3dDevice -> SetRenderState( D3DRS_CULLMODE, D3DCULL_NONE ); g_pd3dDevice -> SetRenderState( D3DRS_ZENABLE, TRUE ); if (FAILED(InitGeometry())) return E_FAIL; return S_OK;} // 清空所有占用的资源 void CleanUp() { SAFE_RELEASE(g_pTexture); SAFE_RELEASE(g_pIB); SAFE_RELEASE(g_pVB); SAFE_RELEASE(g_pd3dDevice); SAFE_RELEASE(g_pD3D);} // 消息处理 LRESULT WINAPI MsgProc(HWND hWnd , UINT message , WPARAM wParam , LPARAM lParam) { switch (message) { case WM_DESTROY: CleanUp(); PostQuitMessage( 0 ); break ; } return ::DefWindowProc(hWnd, message , wParam , lParam);} // Windows 入口 int WINAPI WinMain(IN HINSTANCE hInstance, IN HINSTANCE hPrevInstance, IN LPSTR lpCmdLine, IN int nShowCmd ) { WNDCLASS wndClass; memset( & wndClass , 0 , sizeof (wndClass)); wndClass.hInstance = hInstance; wndClass.lpszClassName = " 渲染到纹理 " ; wndClass.lpfnWndProc = MsgProc; RegisterClass( & wndClass); // 创建窗口 HWND hWnd = CreateWindow( " 渲染到纹理 " , " 渲染到纹理！ " , 0 , 0 , 0 , 640 , 480 , GetDesktopWindow() , 0 , wndClass.hInstance , 0 ); // 显示窗口 ShowWindow(hWnd , SW_SHOWDEFAULT); UpdateWindow(hWnd); // 初始化 D3D 设备 if (SUCCEEDED(InitD3D(hWnd))) { // 消息处理循环 MSG msg; memset( & msg , 0 , sizeof (msg)); while (msg.message != WM_QUIT) { if (PeekMessage( & msg , 0 , 0 , 0 , PM_REMOVE)) { TranslateMessage( & msg); DispatchMessage( & msg); } else { Render(); } } } // 清空场景 CleanUp(); UnregisterClass( " 渲染到纹理 " , wndClass.hInstance); return 0 ;} 