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IDirect3DTexture9 the same as IDirect3DSurface9?

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I found this code:
hr = D3DXCreateTexture(
          texWidth, texHeight,  // dimensions
          0,                    // create a complete mipmap chain
          0,                    // usage - none
          D3DFMT_X8R8G8B8,      // 32-bit XRGB format
          D3DPOOL_MANAGED,      // memory pool
D3DLOCKED_RECT lockedRect;
     _tex->LockRect(0/*lock top surface*/, &lockedRect,
           0 /* lock entire tex*/, 0/*flags*/);

     // fill the texture
     DWORD* imageData = (DWORD*)lockedRect.pBits;
     for(int i = 0; i < texHeight; i++)
          for(int j = 0; j < texWidth; j++)
          D3DXCOLOR c;

          // get height of upper-left vertex of quad.
          float height = (float)getHeightmapEntry(i, j)/_heightScale;

          // set the color of the texel based on the height
          // of the quad it corresponds to.
          if( (height) < 42.5f )       c = d3d::BEACH SAND;
          else if( (height) < 85.0f )  c = d3d::LIGHT YELLOW GREEN;
          else if( (height) < 127.5f ) c = d3d::PUREGREEN;
          else if( (height) < 170.0f ) c = d3d::DARK YELLOW GREEN;
          else if( (height) < 212.5f ) c = d3d::DARKBROWN;
          else                         c = d3d::WHITE;

          // fill locked data, note we divide the pitch by four
          // because the pitch is given in bytes and there are
          // 4 bytes per DWORD.
          imageData[i * lockedRect.Pitch / 4 + j] = (D3DCOLOR)c;

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No, they are not the same. It is observant of you to notice that they both share the same Lock/UnlockRect() functions, but they are not the same thing. Surfaces are generally used as getting specific parts of a texture map, usually individual mip-map levels or the faces of a cube map. So, you could think of IDirect3DSurface9 as being a sort-of more primitive part of what makes up an IDirect3DTexture9. Also, a notable feature of IDirect3DSurface9 is that you can get a HDC to it (if that matters to you at all).

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Garland is correct. Remember, textures are (generally) made up of multiple levels of detail, referred to as mip-maps. Each of these mip-maps is a surface. By definition, a surface is just a set of pixels, residing in vidoe or system memory.

So, just think of a texture as a collection of surfaces. Most people don't really recognize this, because Direct3D really handles all of the mipmap management for you, which is really nice.

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