// include the basic windows header files and the Direct3D header file
#include <windows.h>
#include <windowsx.h>
#include <d3d9.h>
#include <d3dx9.h>


// include the Direct3D Library file
#ifdef _DEBUG
#   pragma comment(lib, "d3dx9d.lib")
#else
#   pragma comment(lib, "d3dx9.lib")
#endif
#pragma comment(lib, "d3d9.lib")



// global declarations
LPDIRECT3D9			d3d;    // the pointer to our Direct3D interface
LPDIRECT3DDEVICE9	d3ddev;    // the pointer to the device class
LPDIRECT3DSURFACE9	surface;
LPDIRECT3DSURFACE9	backbuffer;

#define SCREEN_WIDTH	800
#define SCREEN_HEIGHT	600

#define KEY_DOWN(vk_code)((GetAsyncKeyState(vk_code) & 0x8000) ? 1 : 0)
#define KEY_UP(vk_code)((GetAsyncKeyState(vk_code) & 0x8000) ? 1 : 0)

#include "BSoD.h"

void initD3D(HWND hWnd);    // sets up and initializes Direct3D
void render_frame(void);    // renders a single frame
void cleanD3D(void);    // closes Direct3D and releases memory

// the WindowProc function prototype
LRESULT CALLBACK WindowProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam);


// the entry point for any Windows program
int WINAPI WinMain(HINSTANCE hInstance,
                   HINSTANCE hPrevInstance,
                   LPSTR lpCmdLine,
                   int nCmdShow)
{
    HWND hWnd;
    WNDCLASSEX wc;
	MSG msg;

    wc.cbSize = sizeof(WNDCLASSEX);
    wc.style = CS_HREDRAW | CS_VREDRAW;
    wc.lpfnWndProc = WindowProc;
    wc.hInstance = hInstance;
	wc.hIcon = LoadIcon(NULL, IDI_APPLICATION);
    wc.hCursor = LoadCursor(NULL, IDC_ARROW);
    wc.lpszClassName = "WindowClass";

    RegisterClassEx(&wc);

    hWnd = CreateWindowEx(NULL,
                          "WindowClass",
                          "BSoD",
                          WS_POPUP | WS_EX_TOPMOST | WS_VISIBLE,
                          0, 0,
                          SCREEN_WIDTH, SCREEN_HEIGHT,
                          NULL,
                          NULL,
                          hInstance,
                          NULL);

    ShowWindow(hWnd, nCmdShow);

    // set up and initialize Direct3D
    initD3D(hWnd);

	D3DXLoadSurfaceFromFile(surface,
							NULL,
							NULL,
							"BSoD.bmp",
							NULL,
							D3DX_DEFAULT,
							0,
							NULL);


    // enter the main loop:

    while(TRUE)
    {
        while(PeekMessage(&msg, NULL, 0, 0, PM_REMOVE))
        {
            TranslateMessage(&msg);
            DispatchMessage(&msg);
        }

        if(msg.message == WM_QUIT)
            break;

		render_frame();
		if(KEY_DOWN(VK_ESCAPE))
			PostMessage(hWnd, WM_DESTROY, 0, 0);
    }

    // clean up DirectX and COM
    cleanD3D();

    return msg.wParam;
}


// this is the main message handler for the program
LRESULT CALLBACK WindowProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
    switch(message)
    {
        case WM_DESTROY:
            {
                PostQuitMessage(0);
                return 0;
            } break;
    }

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


// this function initializes and prepares Direct3D for use
void initD3D(HWND hWnd)
{
    d3d = Direct3DCreate9(D3D_SDK_VERSION);    // create the Direct3D interface

    D3DPRESENT_PARAMETERS d3dpp;    // create a struct to hold various device information

    ZeroMemory(&d3dpp, sizeof(d3dpp));    // clear out the struct for use
    d3dpp.Windowed = FALSE;    
    d3dpp.SwapEffect = D3DSWAPEFFECT_DISCARD;    // discard old frames
	d3dpp.BackBufferCount = 1;
	d3dpp.BackBufferFormat = D3DFMT_A8R8G8B8;
	d3dpp.BackBufferWidth = SCREEN_WIDTH;
	d3dpp.BackBufferHeight = SCREEN_HEIGHT;
    d3dpp.hDeviceWindow = hWnd;    // set the window to be used by Direct3D


    // create a device class using this information and the info from the d3dpp stuct
    d3d->CreateDevice(D3DADAPTER_DEFAULT,
                      D3DDEVTYPE_HAL,
                      hWnd,
                      D3DCREATE_SOFTWARE_VERTEXPROCESSING,
                      &d3dpp,
                      &d3ddev);

	d3ddev->CreateOffscreenPlainSurface(
			SCREEN_WIDTH, SCREEN_HEIGHT, 
			D3DFMT_A8R8G8B8,
			D3DPOOL_DEFAULT,
			&surface,
			NULL);
}


// this is the function used to render a single frame
void render_frame(void)
{
    // clear the window to a deep blue
    d3ddev->Clear(0, NULL, D3DCLEAR_TARGET, D3DCOLOR_XRGB(0, 40, 100), 1.0f, 0);

    d3ddev->BeginScene();    // begins the 3D scene

	d3ddev->GetBackBuffer(0,
						  0,
						  D3DBACKBUFFER_TYPE_MONO,
						  &backbuffer );

	d3ddev->StretchRect(surface,
						NULL,
						backbuffer,
						NULL,
						D3DTEXF_NONE);

    d3ddev->EndScene();    // ends the 3D scene

    d3ddev->Present(NULL, NULL, NULL, NULL);   // displays the created frame on the screen

}


// this is the function that cleans up Direct3D and COM
void cleanD3D(void)
{
    d3ddev->Release();    // close and release the 3D device
    d3d->Release();    // close and release Direct3D
}