如何在C++中創建一個IDirect3DSurface9（D3D曲面）曲面的數組？

Question

如果我想創建一個D3D表面，我會像下面這樣做。相似的，如果我想創建一個類型爲IDirect3DSurface9的D3D曲面數組*我該如何在C++中完成？

IDirect3DSurface9** ppdxsurface = NULL; 
IDirect3DDevice9 * pdxDevice = getdevice(); // getdevice is a custom function which gives me //the d3d device. 

pdxDevice->CreateOffscreenPlainSurface(720,480, 
               D3DFMT_A8R8G8B8, 
               D3DPOOL_DEFAULT, 
               pdxsurface, 
               NULL); 

QUERY ::如何創建D3D設備的C++數組？

Answer 1

ppdxsurface沒有正確聲明，你需要提供指針指向指針對象，不只是指向指針的指針。它應是IDirect3DSurface9*，不IDirect3DSurface9**：

IDirect3DSurface9* pdxsurface = NULL; 
IDirect3DDevice9* pdxDevice = getdevice(); 

pdxDevice->CreateOffscreenPlainSurface(720, 480, 
    D3DFMT_A8R8G8B8, D3DPOOL_DEFAULT, 
    &pdxsurface, // Pass pointer to pointer 
    NULL); 

// Usage: 
HDC hDC = NULL; 
pdxsurface->GetDC(hDC); 

要創建面的排列只是把它的循環：

// Define array of 10 surfaces 
const int maxSurfaces = 10; 
IDirect3DSurface9* pdxsurface[maxSurfaces] = { 0 }; 

for(int i = 0; i < maxSurfaces; ++i) 
{ 
    pdxDevice->CreateOffscreenPlainSurface(720, 480, 
     D3DFMT_A8R8G8B8, D3DPOOL_DEFAULT, 
     &pdxsurface[i], 
     NULL); 
} 

或者使用std::vector如果你喜歡動態數組：

std::vector<IDirect3DSurface9*> surfVec; 

for(int i = 0; i < maxSurfaces; ++i) 
{ 
    IDirect3DSurface9* pdxsurface = NULL; 
    pdxDevice->CreateOffscreenPlainSurface(720, 480, 
     D3DFMT_A8R8G8B8, D3DPOOL_DEFAULT, 
     &pdxsurface, 
     NULL); 
    surfVec.push_back(pdxsurface); 
}