#include <windows.h>
#include <d3d9.h>
#include <d3dx9.h>

IDirect3D9* d3dObject = NULL;
IDirect3DDevice9* d3dDevice = NULL;
LPD3DXSPRITE sprite = NULL;
IDirect3DTexture9* texture = NULL;

void initD3D(HWND);
void closeD3D();
void render();

LRESULT CALLBACK WndProc(HWND, 
						 UINT, 
						 WPARAM,
						 LPARAM);

int WINAPI WinMain(HINSTANCE hInstance, 
				   HINSTANCE hPrevInstance, 
				   LPSTR lpCmdLine, 
				   int nCmdShow)
{
	WNDCLASSEX wcex;

	wcex.cbSize = sizeof(WNDCLASSEX);
	wcex.style = CS_HREDRAW | CS_VREDRAW;
	wcex.lpfnWndProc = (WNDPROC)WndProc;
	wcex.cbClsExtra = 0;
	wcex.cbWndExtra = 0;
	wcex.hInstance = hInstance;
	wcex.hIcon = 0;
	wcex.hCursor = LoadCursor(NULL,IDC_ARROW);
	wcex.hbrBackground = (HBRUSH)(COLOR_WINDOW + 1);
	wcex.lpszMenuName = 0;
	wcex.lpszClassName = "WndClass";
	wcex.hIconSm = 0;

	RegisterClassEx(&wcex);
	
	HWND hWnd = CreateWindow("WndClass", "Title", WS_OVERLAPPEDWINDOW,
		CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, 
		NULL, NULL, hInstance, NULL);

	ShowWindow(hWnd, nCmdShow);
	UpdateWindow(hWnd);

	initD3D(hWnd);



	MSG msg;
	ZeroMemory(&msg, sizeof(msg));

	while(msg.message!=WM_QUIT)
	{
		if(PeekMessage(&msg, NULL, 0U, 0U, PM_REMOVE))
		{
			TranslateMessage(&msg);
			DispatchMessage(&msg);
		}

		render();

	}

	closeD3D();

	return (int)msg.wParam;
}

LRESULT CALLBACK WndProc(HWND hWnd, 
						 UINT message, 
						 WPARAM wParam,
						 LPARAM lParam)
{
	switch(message)
	{
	case WM_DESTROY:
		PostQuitMessage(0);
		break;
	}

	return DefWindowProc(hWnd, message, wParam, lParam);
}

void initD3D(HWND hWnd){
	d3dObject = Direct3DCreate9(D3D_SDK_VERSION);

	D3DPRESENT_PARAMETERS d3dpp;
	ZeroMemory(&d3dpp, sizeof(d3dpp));

	d3dpp.Windowed = FALSE	;	
	d3dpp.SwapEffect = D3DSWAPEFFECT_DISCARD;
	d3dpp.BackBufferFormat = D3DFMT_UNKNOWN;
	d3dpp.PresentationInterval = D3DPRESENT_INTERVAL_ONE;

	d3dObject->CreateDevice(D3DADAPTER_DEFAULT, 
							D3DDEVTYPE_HAL,
							hWnd, 
							D3DCREATE_HARDWARE_VERTEXPROCESSING, 
							&d3dpp,
							&d3dDevice);

	D3DXCreateSprite(d3dDevice, &sprite);

	D3DXCreateTextureFromFile(d3dDevice, "chrono.bmp", &texture);

	return;
}

void closeD3D(){
	texture->Release();
	d3dDevice->Release();
	d3dObject->Release();

	return;
}

void render(){
	d3dDevice->Clear(0, NULL, D3DCLEAR_TARGET, D3DCOLOR_XRGB(0, 255, 0), 1.0f, 0);

	d3dDevice->BeginScene();

	D3DXVECTOR3 pos;
	pos.x = 10.0f;
	pos.y = 20.0f;
	pos.z = 0.0f;
	
	sprite->Begin(D3DXSPRITE_ALPHABLEND);
	sprite->Draw(texture, NULL, NULL, &pos, 0xFFFFFFFF);
	sprite->End();

	d3dDevice->EndScene();

	d3dDevice->Present(NULL, NULL, NULL, NULL);	

	return;
}