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/* Beginning game programming, Third Edition
Chapter 4
Create_Surface Program */
#include <windows.h>
#include <d3d9.h>
#include <time.h>
#include <iostream>
using namespace std;
// Application title
const string APPTITLE = "Create Surface Program";
//macro to read the keyboard
#define KEY_DOWN(vk_code) ((GetAsyncKeyState(vk_code)&0x8000)?1:0)
//screen resolution
#define SCREENW 1024
#define SCREENH 768
//Direct3d objects
LPDIRECT3D9 d3d = NULL;
LPDIRECT3DDEVICE9 d3ddev = NULL;
LPDIRECT3DSURFACE9 backbuffer = NULL;
LPDIRECT3DSURFACE9 surface = NULL;
bool gameover = false;
/* Game Initialization function */
bool Game_Init(HWND hWnd)
{
//initialize Direct3D
d3d = Direct3DCreate9(D3D_SDK_VERSION);
if(d3d = NULL)
{
MessageBox(hWnd, "Error Initializing Direct3D","Error", MB_OK);
return false;
}
//set the Direct3D presentation paramaters
D3DPRESENT_PARAMETERS d3dpp;
ZeroMemory(&d3dpp, sizeof(d3dpp));
d3dpp.Windowed = TRUE;
d3dpp.SwapEffect = D3DSWAPEFFECT_DISCARD;
d3dpp.BackBufferFormat = D3DFMT_X8R8G8B8;
d3dpp.BackBufferCount = 1;
d3dpp.BackBufferWidth = SCREENW;
d3dpp.BackBufferHeight = SCREENH;
d3dpp.hDeviceWindow = hWnd;
//create the direct3d device
d3d->CreateDevice(D3DADAPTER_DEFAULT, D3DDEVTYPE_HAL, hWnd,D3DCREATE_SOFTWARE_VERTEXPROCESSING, &d3dpp, &d3ddev);
if(!d3ddev)
{
MessageBox(hWnd, "Error Creating Direct3D device", "Error", MB_OK);
}
//set random number seed
srand(time(NULL));
//clear the back buffer
d3ddev->Clear(0,NULL,D3DCLEAR_TARGET,D3DCOLOR_XRGB(0,0,0),1.0f,0);
//create pointer to the back buffer
d3ddev->GetBackBuffer(0,0,D3DBACKBUFFER_TYPE_MONO,&backbuffer);
//create surface
HRESULT result = d3ddev->CreateOffscreenPlainSurface(
100, //width of the surface
100, // height of the surface
D3DFMT_X8R8G8B8, // surface format
D3DPOOL_DEFAULT, // memory pool to use
&surface,
NULL);
if(!SUCCEEDED(result)) return false;
return true;
}
/*GAME UPDATE FUNCTION */
void Game_Run(HWND hWnd)
{
// make sure the Direct3D device
if(!d3ddev) return;
//start rendering
if(d3ddev->BeginScene())
{
// fill the surface with random color
int r = rand() % 255;
int g = rand() % 255;
int b = rand() % 255;
d3ddev->ColorFill(surface,NULL,D3DCOLOR_XRGB(r,g,b));
//copy the surface to the back buffer
RECT rect;
rect.left = rand() % SCREENW/2;
rect.right = rect.left + rand() % SCREENW/2;
rect.top = rand() % SCREENH/2;
rect.bottom = rect.top + rand() % SCREENH/2;
d3ddev->StretchRect(surface,NULL,backbuffer, &rect,D3DTEXF_NONE);
//stop rendering
d3ddev->EndScene();
//display the back buffer on the screen
d3ddev->Present(NULL,NULL,NULL,NULL);
}
//check for the escape key(to exit program)
if(KEY_DOWN(VK_ESCAPE))
PostMessage(hWnd, WM_DESTROY, 0,0);
}
// Game Shutdown Function
void Game_End(HWND hWnd)
{
if(surface)surface->Release();
if(d3ddev) d3ddev->Release();
if(d3d) d3d->Release();
}
//windows event callback function
LRESULT WINAPI WinProc(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
switch(msg)
{
case WM_DESTROY:
gameover = true;
PostQuitMessage(0);
return 0;
}
return DefWindowProc(hWnd, msg, wParam, lParam);
}
/** Windows entry point function **/
int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow)
{
//create the window class structure
WNDCLASSEX wc;
wc.cbSize = sizeof(WNDCLASSEX);
wc.style = CS_HREDRAW | CS_VREDRAW;
wc.lpfnWndProc = (WNDPROC)WinProc;
wc.cbClsExtra = 0;
wc.cbWndExtra = 0;
wc.hInstance = hInstance;
wc.hIcon = NULL;
wc.hCursor = LoadCursor(NULL,IDC_ARROW);
wc.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH);
wc.lpszMenuName = NULL;
wc.lpszClassName = APPTITLE.c_str();
wc.hIconSm = NULL;
RegisterClassEx(&wc);
//create a new window
HWND window = CreateWindow(APPTITLE.c_str(), APPTITLE.c_str(), WS_OVERLAPPEDWINDOW, CW_USEDEFAULT, CW_USEDEFAULT,SCREENW, SCREENH, NULL, NULL, hInstance, NULL);
//was there an error creating the window?
if(window == 0) return 0;
//display the window
ShowWindow(window, nCmdShow);
UpdateWindow(window);
//initialize the game
if(!Game_Init(window)) return 0;
// main message loop
MSG message;
while(!gameover)
{
if(PeekMessage(&message, NULL,0,0,PM_REMOVE))
{
TranslateMessage(&message);
DispatchMessage(&message);
}
Game_Run(window);
}
return message.wParam;
}
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