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#include "d3dUtility.h"

namespace d3d {

	bool InitD3D( HINSTANCE hInstance, int width, int height, bool windowed, D3DDEVTYPE deviceType, IDirect3DDevice9 **device) {
                
		HWND hwnd;  //´°¿Ú¾ä±ú

		WNDCLASS wndclass; //´°¿ÚÀà±ð£¬ÔÚCreateWindow֮ǰÐèÒªRegisterClass £¬ Õë¶ÔWNDCLASSµÄ²ÎÊý¿ÉÒÔÁ˽âÒ»ÏÂAPI

		wndclass.style=CS_HREDRAW | CS_VREDRAW;
		wndclass.lpfnWndProc=(WNDPROC)d3d::WndProc; //WndProc
		wndclass.cbClsExtra=0;
		wndclass.cbWndExtra=0;
		wndclass.hInstance=hInstance;
		wndclass.hIcon=LoadIcon (NULL, IDI_APPLICATION) ;
		wndclass.hCursor=LoadCursor (NULL, IDC_ARROW) ;
		wndclass.hbrBackground=(HBRUSH) GetStockObject (WHITE_BRUSH) ;
		wndclass.lpszMenuName=NULL ;
		wndclass.lpszClassName=_T("Direct3D9App");

		
		if( !RegisterClass(&wndclass) ) {
			MessageBox(0, _T("This program requires windows NT!"), 0, 0);
			return false;
		}

		hwnd=CreateWindow(_T("Direct3D9App"),_T("Direct3D9App"),WS_EX_TOPMOST,0,0,width,height,0,0,hInstance,0);

		::ShowWindow(hwnd,SW_SHOW);
		::UpdateWindow(hwnd);

                //Íê³ÉÁËÖ÷´°¿Ú³õʼ»¯µÄ¹ý³Ì£¬ÒÔϲ¿·ÖʵÏÖDirect3DµÄ³õʼ»¯¹ý³Ì£¬²¢ÇÒÉèÖÃIDirect3DDevice9Ö¸Õë

		IDirect3D9 *_d3d9;
		_d3d9=Direct3DCreate9(D3D_SDK_VERSION);      //»ñÈ¡IDirect3D9µÄÖ¸Õ룬½øÐÐÉ豸µÄµü´ú£¬¼ì²âÌØÐÔ&»ñÈ¡IDirect3DDevice9Ö¸Õë×¼±¸

		if( !_d3d9 )
		{
			::MessageBox(0, _T("Direct3DCreate9() - FAILED"), 0, 0);
			return false;
		}

		D3DCAPS9 caps;                                 //¼ì²âͼÐÎÉ豸µÄÖ§³ÖµÄÌØÐÔ
		_d3d9->GetDeviceCaps(D3DADAPTER_DEFAULT, D3DDEVTYPE_HAL, &caps);

		int vp=0;                                    //ÊÇ·ñÖ§³ÖÓ²¼þ¶¥µãÔËËã
		if(caps.DevCaps & D3DDEVCAPS_HWTRANSFORMANDLIGHT) {
			vp=D3DCREATE_HARDWARE_VERTEXPROCESSING;
		}
		else {
			vp=D3DCREATE_SOFTWARE_VERTEXPROCESSING;
		}

		D3DPRESENT_PARAMETERS d3dpp;                    //D3DPRESENT_PARAMETERSÉèÖã¬ÉèÖÃIDirect3DDeviceµÄÌØÐÔ
		::ZeroMemory(&d3dpp, sizeof(D3DPRESENT_PARAMETERS));
		d3dpp.BackBufferWidth=width;
		d3dpp.BackBufferHeight=height;
		d3dpp.BackBufferFormat=D3DFMT_A8R8G8B8;
		d3dpp.BackBufferCount=1;
		d3dpp.MultiSampleType=D3DMULTISAMPLE_NONE;
		d3dpp.MultiSampleQuality=0;
		d3dpp.SwapEffect=D3DSWAPEFFECT_DISCARD;
		d3dpp.hDeviceWindow=hwnd;
		d3dpp.Windowed=windowed;
		d3dpp.EnableAutoDepthStencil=true;
		d3dpp.AutoDepthStencilFormat=D3DFMT_D24S8;
		d3dpp.Flags=0;
		d3dpp.FullScreen_RefreshRateInHz=D3DPRESENT_RATE_DEFAULT;
		d3dpp.PresentationInterval=D3DPRESENT_INTERVAL_IMMEDIATE;

		HRESULT hr=_d3d9->CreateDevice(D3DADAPTER_DEFAULT, D3DDEVTYPE_HAL, hwnd, vp, &d3dpp, device);
		if( FAILED(hr) ) {
			::MessageBox(0, _T("CreateDevice() - Failed"), 0, 0);
			return false;
		}

		return true;
	}

	int EnterMsgLoop( bool (*ptr_display)(float timeDelta) ) {
		MSG msg;
		::ZeroMemory( &msg, sizeof(MSG) );
		
		static float lastTime=(float)timeGetTime();

		while(msg.message !=WM_QUIT) {
			if(::PeekMessage(&msg, 0, 0, 0, PM_REMOVE)) {
				::TranslateMessage(&msg);
				::DispatchMessage(&msg);
			}
			else {                                              //¿ÕÏеÄʱºò½øÐлæÖÆ
				float currTime=(float)timeGetTime();
				float timeDelta=(currTime - lastTime)*0.001f;

				ptr_display(timeDelta);

				lastTime=currTime;
			}
		}

		return msg.wParam;
	}

	LRESULT CALLBACK WndProc( HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam) {
		switch( msg ) {
			case WM_DESTROY:
				::PostQuitMessage(0);
				break;
			case WM_KEYDOWN:
				if(wParam==VK_ESCAPE)                    //escÍ˳öÖ÷´°¿Ú³ÌÐò
					::DestroyWindow(hwnd);
				break;
		}
		return ::DefWindowProc(hwnd, msg, wParam, lParam);
	}
}