#include <d3dx9.h>
namespace d3d
{
    bool InitD3D(
	HINSTANCE hInstance,
	int width, int height,
	bool windowed,
	D3DDEVTYPE deviceType,
	IDirect3DDevice9** device);

    int EnterMsgLoop(
	bool (*ptr_display)(float timeDelta));

	LRESULT CALLBACK WndProc(
		HWND hwnd,
		UINT msg,
		WPARAM wParam,
		LPARAM lParam);

    template<class T> void Release(T t)
    {
	if (t) {
	    t->Release();
	    t = 0;
	}
    }

    template<class T> void Delete(T t)
    {
	if (t) {
	    delete t;
	    t = 0;
	}
    }
}

int d3d::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 {
	    float currTime = (float)timeGetTime();
	    float timeDelta = (currTime = lastTime) * 0.001f;
	    ptr_display(timeDelta); // call display function
	    lastTime = currTime;
	}
    }
    return msg.wParam;
}

#include "d3dUtility.h"

IDirect3DDevice9* Device = 0;

bool Setup()
{
    return true;
}

void Cleanup()
{
}

bool Display(float timeDelta)
{
    if (Device) {
	Device->Clear(0, 0, D3DCLEAR_TARGET | D3DCLEAR_ZBUFFER,
			  0x00000000, 1.0f, 0);
	Device->Present(0, 0, 0, 0);// present backbuffer
    }
    return true;
}

HRESULT IDirect3DDevice9::Clear(
	DWORD Count,
	const D3DRECT* pRects,
	DWORD Flags,
	D3DCOLOR Color,
	float Z,
	DWORD Stencil
);

LRESULT CALLBACK d3d::WndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
    switch (msg) {
    case WM_DESTROY:
	::PostQuitMessage(0);
	break;
    case WM_KEYDOWN:
	if (wParam == VK_ESCAPE)
	    ::DestroyWindow(hwnd);
	break;
    }
    return ::DefWindowProc(hwnd, msg, wParam, lParam);
}

int WINAPI WinMain(HINSTANCE hinstance,
                   HINSTANCE prevInstance,
                   LPSTR      cmdLine,
                   int       showCmd)
{
    if (!d3d::InitD3D(hinstance, 800, 600, true, D3DDEVTYPE_HAL, &Device)) {
	::MessageBox(0, "InitD3D() - FALIED", 0, 0);
	return 0;
    }

    if (!Setup()) {
	::MessageBox(0, "Setup() - FALLED", 0, 0);
	return 0;
    }

    d3d::EnterMsgLoop(Display);
    Cleanup();
    Device->Release();
    return 0;
}