導入.x文件生成漸進網格

 以先前文章中的 DirectX 框架爲基礎,寫了一個導入.x文件生成漸進網格的例子。按下'A'鍵增加網格頂點數(不超過最大值)  按下  'S'  鍵減小頂點數 (不小於最小值) 

代碼清單:

1. //////////////////////////////////////////////////////////////////////////////////////////////////
2. //xfile.cpp 
3. //by tianzhihen
4. //2008.10.19
5. //VC8.0          
6. //////////////////////////////////////////////////////////////////////////////////////////////////
9. #include "d3dUtility.h"
10. #include <vector>
13. IDirect3DDevice9* Device = 0 ;
15. const int Width = 640;
16. const int Height = 480;
18. ID3DXMesh*                      SourceMesh = 0; //網格
19. ID3DXPMesh*                     PMesh = 0;      //漸進網格
20. std::vector<D3DMATERIAL9>       Mtrl(0);        //材質
21. std::vector<IDirect3DTexture9*> Textures(0);    //紋理
25. bool Setup()
26. {
27.     HRESULT hr = 0;
29.     ID3DXBuffer* adjBuffer = 0;   // 鄰接緩存
30.     ID3DXBuffer* mtrlBuffer = 0;  // 材質緩存
31.     DWORD numMtrls = 0;           // 材質數量
33.     //
34.     // 從 .X 文件中加載數據到網格
35.     //
37.     hr = D3DXLoadMeshFromX(
38.         "bigship1.x",
39.         D3DXMESH_MANAGED,//託管內存池
40.         Device,
41.         &adjBuffer,
42.         &mtrlBuffer,
43.         0,
44.         &numMtrls,
45.         &SourceMesh //目的網格地址
46.         );
48.     if(FAILED(hr))
49.     {
50.         ::MessageBox(0, "D3DXLoadMeshFromX() - FAILED", 0, 0);
51.         return false;
52.     }
54.     if (mtrlBuffer!=0&&numMtrls!=0)
55.     {
56.         //材質存在
58.         /*
59.          typedef struct D3DXMATERIAL {
60.                 D3DMATERIAL9 MatD3D;    //材質
61.                 LPSTR pTextureFilename; //紋理地址
62.             } D3DXMATERIAL, *LPD3DXMATERIAL;
63.         */
65.         D3DXMATERIAL* mtrls =(D3DXMATERIAL*)mtrlBuffer->GetBufferPointer();
67.         for (int i=0;i<numMtrls;i++)
68.         {
69.             mtrls[i].MatD3D.Ambient = mtrls[i].MatD3D.Diffuse;  // .X 文件中沒有定義材質的環境光分量
71.             Mtrl.push_back(mtrls[i].MatD3D);
73.             if (mtrls[i].pTextureFilename!=0)
74.             {
75.                 IDirect3DTexture9* tex = 0;
76.                 D3DXCreateTextureFromFile(Device,mtrls[i].pTextureFilename,&tex);   //加載紋理
77.                 Textures.push_back(tex);
78.             }
79.             else
80.             {
81.                 Textures.push_back(0);
82.             }
83.         }
84.     }
85.     d3d::Release<ID3DXBuffer*>(mtrlBuffer);
87.     //
88.     // 優化網格數據
89.     //
91.     hr = SourceMesh->OptimizeInplace(
92.             D3DXMESHOPT_ATTRSORT|
93.             D3DXMESHOPT_COMPACT|
94.             D3DXMESHOPT_VERTEXCACHE,
95.             (DWORD*)adjBuffer->GetBufferPointer(),
96.             (DWORD*)adjBuffer->GetBufferPointer(),
97.             0,0
98.         );
100.     if (FAILED(hr))
101.     {
102.         ::MessageBox(0,"OptimizeInplace() - FAILED",0,0);
103.         d3d::Release<ID3DXBuffer*>(adjBuffer);
104.         return E_FAIL;
105.     }
107.     //
108.     // 生成漸進網格
109.     //
111.     hr = D3DXGeneratePMesh(
112.             SourceMesh,
113.             (DWORD*)adjBuffer->GetBufferPointer(),
114.             0,
115.             0,
116.             1,
117.             D3DXMESHSIMP_FACE,
118.             
119.         );
121.     d3d::Release<ID3DXMesh*>(SourceMesh);
122.     d3d::Release<ID3DXBuffer*>(adjBuffer);
124.     if(FAILED(hr))
125.     {
126.         ::MessageBox(0, "D3DXGeneratePMesh() - FAILED", 0, 0);
127.         return E_FAIL;
128.     }
130.     // 設置漸進網格初始面片值爲最大
132.     DWORD maxFaces = PMesh->GetMaxFaces();
133.     PMesh->SetNumFaces(maxFaces);
135.     //紋理採樣模式
137.     Device->SetSamplerState(0, D3DSAMP_MAGFILTER, D3DTEXF_LINEAR);
138.     Device->SetSamplerState(0, D3DSAMP_MINFILTER, D3DTEXF_LINEAR);
139.     Device->SetSamplerState(0, D3DSAMP_MIPFILTER, D3DTEXF_POINT);
141.     //
142.     // 設置光照
143.     //
145.     D3DXVECTOR3 dir(1.0f,-1.0f,1.0f);
146.     D3DXCOLOR col(1.0f,1.0f,1.0f,1.0f);
147.     D3DLIGHT9 light = d3d::InitDirectionalLight(&dir,&col);
149.     Device->SetLight(0,&light);
150.     Device->LightEnable(0,true);
151.     Device->SetRenderState(D3DRS_NORMALIZENORMALS, true);
152.     Device->SetRenderState(D3DRS_SPECULARENABLE, true);
154.     //
155.     // 設置取景變換矩陣
156.     //
158.     D3DXVECTOR3 pos(-8.0f, 4.0f, -12.0f);
159.     D3DXVECTOR3 target(0.0f, 0.0f, 0.0f);
160.     D3DXVECTOR3 up(0.0f, 1.0f, 0.0f);
162.     D3DXMATRIX V;
163.     D3DXMatrixLookAtLH(
164.         &V,
165.         &pos,
166.         &target,
167.         &up);
169.     Device->SetTransform(D3DTS_VIEW, &V);
171.     //
172.     // 設置投影矩陣
173.     //
175.     D3DXMATRIX proj;
176.     D3DXMatrixPerspectiveFovLH(
177.         &proj,
178.         D3DX_PI * 0.5f, // 90 - degree
179.         (float)Width / (float)Height,
180.         1.0f,
181.         1000.0f);
182.     Device->SetTransform(D3DTS_PROJECTION, &proj);
184.     return true;
185. }
188. void Cleanup()
189. {
190.     d3d::Release<ID3DXPMesh*>(PMesh);
192.     for (int i=0;i<Textures.size();i++)
193.     {
194.         d3d::Release<IDirect3DTexture9*>(Textures[i]);
195.     }
196. }
199. bool Display(float timeDelta)
200. {
201.     if (Device)
202.     {
203.         int numFaces = PMesh->GetNumFaces();
205.         if (::GetAsyncKeyState('A')&0x8000f)
206.         {
207.             //按下'A'鍵則增加面片數
209.             PMesh->SetNumFaces(numFaces+1);
210.             if(PMesh->GetNumFaces()==numFaces)
211.                 PMesh->SetNumFaces(numFaces+2);
212.         }
214.         if(::GetAsyncKeyState('S')&0x8000f)
215.         {
216.             //按下'S'鍵則減少面片數
218.             PMesh->SetNumFaces(numFaces-1);
219.         }
222.         //
223.         // 繪製場景
224.         //
226.         Device->Clear(0,0,D3DCLEAR_TARGET | D3DCLEAR_ZBUFFER,0xffffffff,1.0f,0);
227.         Device->BeginScene();
229.         for (int i=0;i<Mtrl.size();i++)
230.         {
231.             //繪製模型
232.             Device->SetMaterial(&Mtrl[i]);
233.             Device->SetTexture(0,Textures[i]);
234.             PMesh->DrawSubset(i);
236.             // 繪製面片線框
237.             Device->SetMaterial(&d3d::YELLOW_MTRL);
238.             Device->SetRenderState(D3DRS_FILLMODE,D3DFILL_WIREFRAME);
239.             PMesh->DrawSubset(i);
240.             Device->SetRenderState(D3DRS_FILLMODE,D3DFILL_SOLID);
241.         }
243.         Device->EndScene();
244.         Device->Present(0,0,0,0);
245.         
246.     }
248.     return true;
249. }
253. //
254. // WndProc
255. //
257. LRESULT CALLBACK d3d::WndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
258. {
259.     switch( msg )
260.     {
261.     case WM_DESTROY:
262.         ::PostQuitMessage(0);
263.         break;
265.     case WM_KEYDOWN:
266.         if( wParam == VK_ESCAPE )
267.             ::DestroyWindow(hwnd);
268.         break;
269.     }
270.     return ::DefWindowProc(hwnd, msg, wParam, lParam);
271. }
273. //
274. // WinMain
275. //
277. int WINAPI WinMain(HINSTANCE hinstance,
278.                    HINSTANCE prevInstance, 
279.                    PSTR cmdLine,
280.                    int showCmd)
281. {
282.     if(!d3d::InitD3D(hinstance,
283.         Width, Height, true, D3DDEVTYPE_HAL, &Device))
284.     {
285.         ::MessageBox(0, "InitD3D() - FAILED", 0, 0);
286.         return 0;
287.     }
289.     if(!Setup())
290.     {
291.         ::MessageBox(0, "Setup() - FAILED", 0, 0);
292.         return 0;
293.     }
295.     d3d::EnterMsgLoop( Display );
297.     Cleanup();
299.     Device->Release();
301.     return 0;
302. }