textured quad

// Assumes pDevice is a valid IDirect3DDevice9*// Assumes pTexture is a valid IDirect3DTexture9*// Vertex structure (post-transformed, in scrood coordinates)struct TLVertex{   TLVertex() {}   TLVertex(D3DXVECTOR3 _pos, DWORD _colour, float _u, float _v, float _rhw=1.0f)      : vPos(_pos), rhw(_rhw), dwColour(_colour), u1(_u), v1(_v) {}   D3DXVECTOR3 vPos;   float rhw;   DWORD dwColour;   float u1;   float v1;};#define FVF_TLVERTEX (D3DFVF_XYZRHW | D3DFVF_DIFFUSE | D3DFVF_TEX1)// Create a vertex buffer with space for 4 quads. Specify D3DUSAGE_WRITEONLY!LPDIRECT3DVERTEXBUFFER9 pVB;HRESULT hResult = pDevice->CreateVertexBuffer(4*sizeof(TLVertex), D3DUSAGE_WRITEONLY, FVF_TLVERTEX, D3DPOOL_MANAGED, &pVB, NULL);if(FAILED(hResult))   return; // Error// Lock the vertex buffer, fill it, then unlock it:TLVertex* pVerts;hResult = pVB->Lock(0,0,(void**)&pVerts,0);if(FAILED(hResult))   return; // ErrorpVerts[0] = TLVertex(D3DXVECTOR3(0,0,0),0xffffffff,0,0);pVerts[1] = TLVertex(D3DXVECTOR3(0,100,0),0xffffffff,0,1);pVerts[2] = TLVertex(D3DXVECTOR3(100,0,0),0xffffffff,1,0);pVerts[3] = TLVertex(D3DXVECTOR3(100,100,0),0xffffffff,1,1);pVB->Unlock();// In your main rendering loop:// Only specify D3DCLEAR_ZBUFFER if you have a Z-Buffer attachedpDevice->Clear(0,NULL,D3DCLEAR_TARGET|D3DCLEAR_ZBUFFER,0x00000000,1.0f,0);pDevice->BeginScene();// Tell D3D to render from the VB, and tell it what format it's to render in (Transformed verts)pDevice->SetFVF(FVF_TLVERTEX);pDevice->SetStreamSource(0,pVB,0,sizeof(TLVertex));// Set the texturepDevice->SetTexture(0,pTexture);// Draw the quad pDevice->DrawPrimitive(D3DPT_TRIANGLESTRIP,0,2);// Show what's rendered on the screenpDevice->EndScene();pDevice->Present(NULL,NULL,NULL,NULL);