d3d_fixed_pipeline.cpp

// clear the back buffer to black for the new frame 
device_ptr->Clear(0, NULL, D3DCLEAR_TARGET, D3DCOLOR_XRGB(0, 0, 0), 1.0f, 0);

device_ptr->BeginScene();

// select which vertex format we are using
device_ptr->SetFVF(CUSTOMFVF);

// select the vertex buffer to display
device_ptr->SetStreamSource(0, v_buffer, 0, sizeof(CUSTOMVERTEX));

// copy the vertex buffer to the back buffer
device_ptr->DrawPrimitive(D3DPT_TRIANGLELIST, 0, 1);

device_ptr->EndScene();