#include <d3dx8.h>

LPDIRECT3D8             g_pD3D       = NULL;
LPDIRECT3DDEVICE8       g_pd3dDevice = NULL;

//-----------------------------------------------------------------------------
// D3DInit
//-----------------------------------------------------------------------------

HRESULT D3DInit(HWND hWnd)
{
    if( NULL == ( g_pD3D = Direct3DCreate8( D3D_SDK_VERSION ) ) )
        return E_FAIL;

    D3DDISPLAYMODE d3ddm;
    if( FAILED( g_pD3D->GetAdapterDisplayMode( D3DADAPTER_DEFAULT, &d3ddm ) ) )
        return E_FAIL;

    D3DPRESENT_PARAMETERS d3dpp;
    ZeroMemory( &d3dpp, sizeof(d3dpp) );
    d3dpp.Windowed = TRUE;
    d3dpp.SwapEffect = D3DSWAPEFFECT_DISCARD;
    d3dpp.BackBufferFormat = d3ddm.Format;
    d3dpp.EnableAutoDepthStencil = TRUE;
    d3dpp.AutoDepthStencilFormat = D3DFMT_D16;


    if( FAILED( g_pD3D->CreateDevice( D3DADAPTER_DEFAULT, D3DDEVTYPE_REF, hWnd,
                                      D3DCREATE_SOFTWARE_VERTEXPROCESSING,
                                      &d3dpp, &g_pd3dDevice ) ) )
    {
        return E_FAIL;
    }

		// We're going to handle lighting ourselves, for now
    g_pd3dDevice->SetRenderState( D3DRS_LIGHTING, FALSE );

    return S_OK;
}

//-----------------------------------------------------------------------------
// D3DShutdown
//-----------------------------------------------------------------------------

void D3DShutdown()
{
    if( g_pd3dDevice != NULL) 
        g_pd3dDevice->Release();

    if( g_pD3D != NULL)
        g_pD3D->Release();
}


//-----------------------------------------------------------------------------
// D3DRender
//-----------------------------------------------------------------------------

void D3DRender()
{
    if( NULL == g_pd3dDevice )
        return;

    // Clear the backbuffer to black
    g_pd3dDevice->Clear( 0, NULL, D3DCLEAR_TARGET|D3DCLEAR_ZBUFFER, D3DCOLOR_XRGB(0,0,0), 1.0f, 0 );
    
    // Begin the scene
    g_pd3dDevice->BeginScene();
    
    // Draw stuff here
    
    // End the scene
    g_pd3dDevice->EndScene();
    
    // Present the backbuffer contents to the display
    g_pd3dDevice->Present( NULL, NULL, NULL, NULL );
}

//-----------------------------------------------------------------------------
// MsgProc
//-----------------------------------------------------------------------------
// Interprets Windows messages

LRESULT WINAPI MsgProc( HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam )
{
    switch( msg )
    {
        case WM_DESTROY:
		case WM_KEYUP:
            PostQuitMessage( 0 );
            return 0;

        case WM_PAINT:
			D3DRender();
            ValidateRect( hWnd, NULL );
            return 0;
    }

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

//-----------------------------------------------------------------------------
// WinMain
//-----------------------------------------------------------------------------
// Windows main entry point

int APIENTRY WinMain(HINSTANCE hInstance,
                     HINSTANCE hPrevInstance,
                     LPSTR     lpCmdLine,
                     int       nCmdShow)
{
    // Register the window class
    WNDCLASSEX wc = { sizeof(WNDCLASSEX), CS_CLASSDC, MsgProc, 0L, 0L, 
                      GetModuleHandle(NULL), NULL, NULL, NULL, NULL,
                      "D3D Tutorial 1", NULL };
    RegisterClassEx( &wc );

    // Create the application's window
    HWND hWnd = CreateWindow( "D3D Tutorial 1", "D3D Tutorial 1", 
                              WS_OVERLAPPEDWINDOW, 100, 100, 300, 300,
                              GetDesktopWindow(), NULL, wc.hInstance, NULL );

    // Initialize Direct3D
    if( SUCCEEDED( D3DInit(hWnd) ) )
    {
        // Show the window
        ShowWindow( hWnd, SW_SHOWDEFAULT );
        UpdateWindow( hWnd );

        // Enter the message loop
        MSG msg;
        ZeroMemory( &msg, sizeof(msg) );
        while( msg.message != WM_QUIT )
        {
            if( PeekMessage( &msg, NULL, 0U, 0U, PM_REMOVE ) )
            {
                TranslateMessage( &msg );
                DispatchMessage( &msg );
            }
            else
                D3DRender();
        }
    }

    // Clean up everything and exit the app
	D3DShutdown();
    UnregisterClass( "D3D Tutorial 1", wc.hInstance );
    return 0;
}