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//-----------------------------------------------------------------------------

// File: CreateDevice.cpp

//

// Desc: This is the first tutorial for using Direct3D. In this tutorial, all

//       we are doing is creating a Direct3D device and using it to clear the

//       window.

//

// Copyright (c) Microsoft Corporation. All rights reserved.

//-----------------------------------------------------------------------------

#include <d3d9.h>
#pragma warning( disable : 4996 ) // disable deprecated warning 

#include <strsafe.h>
#pragma warning( default : 4996 ) 
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#include <atltypes.h>


//-----------------------------------------------------------------------------

// Global variables

//-----------------------------------------------------------------------------

LPDIRECT3D9             g_pD3D       = NULL; // Used to create the D3DDevice

LPDIRECT3DDEVICE9  g_pd3dDevice = NULL; // Our rendering device

bool                g_isDragging = false; // signals if a dragging is in process

RECT                g_dragRect;         // the dragging rectangle




//-----------------------------------------------------------------------------

// Name: InitD3D()

// Desc: Initializes Direct3D

//-----------------------------------------------------------------------------

HRESULT InitD3D( HWND hWnd )
{
    // Create the D3D object, which is needed to create the D3DDevice.

    if( NULL == ( g_pD3D = Direct3DCreate9( D3D_SDK_VERSION ) ) )
        return E_FAIL;

    // Set up the structure used to create the D3DDevice. Most parameters are

    // zeroed out. We set Windowed to TRUE, since we want to do D3D in a

    // window, and then set the SwapEffect to "discard", which is the most

    // efficient method of presenting the back buffer to the display.  And 

    // we request a back buffer format that matches the current desktop display 

    // format.

    D3DPRESENT_PARAMETERS d3dpp; 
    ZeroMemory( &d3dpp, sizeof(d3dpp) );
    d3dpp.Windowed = TRUE;
    d3dpp.SwapEffect = D3DSWAPEFFECT_DISCARD;
    d3dpp.BackBufferFormat = D3DFMT_UNKNOWN;

    // Create the Direct3D device. Here we are using the default adapter (most

    // systems only have one, unless they have multiple graphics hardware cards

    // installed) and requesting the HAL (which is saying we want the hardware

    // device rather than a software one). Software vertex processing is 

    // specified since we know it will work on all cards. On cards that support 

    // hardware vertex processing, though, we would see a big performance gain 

    // by specifying hardware vertex processing.

    if( FAILED( g_pD3D->CreateDevice( D3DADAPTER_DEFAULT, D3DDEVTYPE_HAL, hWnd,
                                      D3DCREATE_SOFTWARE_VERTEXPROCESSING,
                                      &d3dpp, &g_pd3dDevice ) ) )
    {
        return E_FAIL;
    }

    // Device state would normally be set here

    g_pd3dDevice->SetRenderState( D3DRS_LIGHTING, FALSE );
    g_pd3dDevice->SetFVF( D3DFVF_XYZRHW | D3DFVF_DIFFUSE );

    return S_OK;
}




//-----------------------------------------------------------------------------

// Name: Cleanup()

// Desc: Releases all previously initialized objects

//-----------------------------------------------------------------------------

VOID Cleanup()
{
    if( g_pd3dDevice != NULL) 
        g_pd3dDevice->Release();

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




//-----------------------------------------------------------------------------

// Name: Render()

// Desc: Draws the scene

//-----------------------------------------------------------------------------

VOID Render()
{
    if( NULL == g_pd3dDevice )
        return;

    // Clear the backbuffer to a black color

    g_pd3dDevice->Clear( 0, NULL, D3DCLEAR_TARGET, D3DCOLOR_XRGB(0,0,0), 1.0f, 0 );
    
    // Begin the scene

    if( SUCCEEDED( g_pd3dDevice->BeginScene() ) )
    {
        // Rendering of scene objects can happen here

        if( g_isDragging )
        {
                struct Vertex
            {
                float x,y,z,rhw;
                D3DCOLOR color;
            };

#pragma warning(disable: 4244)

            Vertex vertices[5];
            vertices[0].x = g_dragRect.left; //top left

            vertices[0].y = g_dragRect.top;
            vertices[0].z = 1.0f;
            vertices[0].rhw = 1.0f;
            vertices[0].color = D3DCOLOR_XRGB(0,255,0);
            vertices[1].x = g_dragRect.right; //top right

            vertices[1].y = g_dragRect.top;
            vertices[1].z = 1.0f;
            vertices[1].rhw = 1.0f;
            vertices[1].color = D3DCOLOR_XRGB(0,255,0);
            vertices[2].x = g_dragRect.right; //right bottom

            vertices[2].y = g_dragRect.bottom;
            vertices[2].z = 1.0f;
            vertices[2].rhw = 1.0f;
            vertices[2].color = D3DCOLOR_XRGB(0,255,0);
            vertices[3].x = g_dragRect.left; //bottom left

            vertices[3].y = g_dragRect.bottom;
            vertices[3].z = 1.0f;
            vertices[3].rhw = 1.0f;
            vertices[3].color = D3DCOLOR_XRGB(0,255,0);
            vertices[4].x = g_dragRect.left; //top left again

            vertices[4].y = g_dragRect.top;
            vertices[4].z = 1.0f;
            vertices[4].rhw = 1.0f;
            vertices[4].color = D3DCOLOR_XRGB(0,255,0);


#pragma warning(default: 4244)

            g_pd3dDevice->DrawPrimitiveUP( D3DPT_LINESTRIP, 4, (void*) vertices, sizeof( Vertex ) ); 
        }
        
    
        // End the scene

        g_pd3dDevice->EndScene();
    }

    // Present the backbuffer contents to the display

    g_pd3dDevice->Present( NULL, NULL, NULL, NULL );
}

//-----------------------------------------------------------------------------

// Name: MsgProc()

// Desc: The window's message handler

//-----------------------------------------------------------------------------

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

        case WM_PAINT:
            Render();
            ValidateRect( hWnd, NULL );
            return 0;
    case WM_LBUTTONDOWN:
        g_isDragging = true;
        g_dragRect.right = g_dragRect.left = LOWORD( lParam );
        g_dragRect.bottom = g_dragRect.top = HIWORD( lParam );
        return 0;
    case WM_LBUTTONUP:
        if( g_isDragging )
        {
            ReleaseCapture();
            InvalidateRect( hWnd, NULL, TRUE );
        }
        g_isDragging = false;
        return 0;
    case WM_MOUSEMOVE:
        if( g_isDragging )
        {
            SetCapture( hWnd );
            POINT cp; GetCursorPos( &cp );
            ScreenToClient( hWnd, &cp );
            RECT cr; GetClientRect( hWnd, &cr );
                        //Validating ranges

            if( cp.x < 0 )
                cp.x = 0;
            if( cp.y < 0 )
                cp.y = 0;
            if( cp.x > cr.right )
                cp.x = cr.right - 1;
            if( cp.y > cr.bottom )
                cp.y = cr.bottom - 1;
            g_dragRect.right = cp.x;
            g_dragRect.bottom = cp.y;
            Render();
            ValidateRect( hWnd, NULL );
        }
        return 0;
    }

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




//-----------------------------------------------------------------------------

// Name: WinMain()

// Desc: The application's entry point

//-----------------------------------------------------------------------------

INT WINAPI WinMain( HINSTANCE hInst, HINSTANCE, LPSTR, INT )
{
    // Register the window class

    WNDCLASSEX wc = { sizeof(WNDCLASSEX), CS_CLASSDC | CS_HREDRAW | CS_VREDRAW, MsgProc, 0L, 0L, 
                      GetModuleHandle(NULL), NULL, LoadCursor( hInst, IDC_ARROW ), NULL, NULL,
                      "D3D Tutorial", NULL };
    RegisterClassEx( &wc );

    // Create the application's window

    HWND hWnd = CreateWindow( "D3D Tutorial", "D3D Tutorial 01: CreateDevice", 
                              WS_OVERLAPPEDWINDOW, 100, 100, 300, 300,
                              NULL, NULL, wc.hInstance, NULL );

    // Initialize Direct3D

    if( SUCCEEDED( InitD3D( hWnd ) ) )
    { 
        // Show the window

        ShowWindow( hWnd, SW_SHOWDEFAULT );
        UpdateWindow( hWnd );

        // Enter the message loop

        MSG msg; 
        while( GetMessage( &msg, NULL, 0, 0 ) )
        {
            TranslateMessage( &msg );
            DispatchMessage( &msg );
        }
    }

    UnregisterClass( "D3D Tutorial", wc.hInstance );
    return 0;
}