-- 发布时间：11/25/2008 3:28:00 PM
--
ID3DXFont其他相关接口函数
函数ID3DXFont::GetDevice()能够获得与ID3DXFont相关联的Direct3D设备指针，该函数声明如下：
Retrieves the Direct3D device associated with the font object.
HRESULT GetDevice( LPDIRECT3DDEVICE9 * ppDevice);
Parameters
ppDevice
[out] Address of a pointer to an IDirect3DDevice9 interface, representing the Direct3D device object associated with the font object.
Return Values
If the method succeeds, the return value is S_OK. If the method fails, the return value can be one of the following: D3DERR_INVALIDCALL, D3DXERR_INVALIDDATA.
Remarks
Note Calling this method will increase the internal reference count on the IDirect3DDevice9 interface. Be sure to call IUnknown when you are done using this IDirect3DDevice9 interface or you will have a memory leak.
示例截图：
源程序：
#include <D3D9.h>
#include <D3DX9Core.h>
#pragma warning(disable : 4127)
#define CLASS_NAME "GameApp"
#define release_com(p) do { if(p) { (p)->Release(); (p) = NULL; } } while(0)
IDirect3D9* g_d3d;
IDirect3DDevice9* g_device;
ID3DXFont* g_font;
RECT g_client_rect;
const char* g_text = "Welcome to Direct3D!";
bool init_d3d(HWND hwnd)
{
g_d3d = Direct3DCreate9(D3D_SDK_VERSION);
if(g_d3d == NULL)
return false;
D3DPRESENT_PARAMETERS d3dpp;
ZeroMemory(&d3dpp, sizeof(d3dpp));
d3dpp.Windowed = TRUE;
d3dpp.SwapEffect = D3DSWAPEFFECT_DISCARD;
d3dpp.BackBufferFormat = D3DFMT_UNKNOWN;
if(FAILED(g_d3d->CreateDevice(D3DADAPTER_DEFAULT, D3DDEVTYPE_HAL, hwnd, D3DCREATE_SOFTWARE_VERTEXPROCESSING,
&d3dpp, &g_device)))
{
return false;
}
/*
D3DXCreateFontA(
LPDIRECT3DDEVICE9 pDevice,
INT Height,
UINT Width,
UINT Weight,
UINT MipLevels,
BOOL Italic,
DWORD CharSet,
DWORD OutputPrecision,
DWORD Quality,
DWORD PitchAndFamily,
LPCSTR pFaceName,
LPD3DXFONT* ppFont);
*/
D3DXCreateFont(g_device, 50, 20, 20, 0, FALSE, DEFAULT_CHARSET, 0, 0, 0, "Arial", &g_font);
GetClientRect(hwnd, &g_client_rect);
return true;
}
void cleanup()
{
release_com(g_font);
release_com(g_device);
release_com(g_d3d);
}
void render()
{
g_device->Clear(0, NULL, D3DCLEAR_TARGET, D3DCOLOR_XRGB(5, 5, 5), 1.0f, 0);
g_device->BeginScene();
DWORD format = DT_SINGLELINE | DT_NOCLIP | DT_CENTER | DT_VCENTER;
g_font->DrawText(NULL, g_text, (INT) strlen(g_text), &g_client_rect, format, 0xFFFFFF00);
g_device->EndScene();
g_device->Present(NULL, NULL, NULL, NULL);
}
LRESULT WINAPI WinProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
switch(msg)
{
case WM_KEYDOWN:
if(wParam == VK_ESCAPE)
DestroyWindow(hwnd);
break;
case WM_DESTROY:
PostQuitMessage(0);
return 0;
}
return DefWindowProc(hwnd, msg, wParam, lParam);
}
int WINAPI WinMain(HINSTANCE inst, HINSTANCE, LPSTR, INT)
{
WNDCLASSEX wc;
wc.cbSize = sizeof(WNDCLASSEX);
wc.style = CS_CLASSDC;
wc.lpfnWndProc = WinProc;
wc.cbClsExtra = 0;
wc.cbWndExtra = 0;
wc.hInstance = inst;
wc.hIcon = NULL;
wc.hCursor = NULL;
wc.hbrBackground = NULL;
wc.lpszMenuName = NULL;
wc.lpszClassName = CLASS_NAME;
wc.hIconSm = NULL;
if(! RegisterClassEx(&wc))
return -1;
HWND hwnd = CreateWindow(CLASS_NAME, "Direct3D App", WS_OVERLAPPEDWINDOW, 200, 100, 600, 500,
NULL, NULL, wc.hInstance, NULL);
if(hwnd == NULL)
return -1;
if(init_d3d(hwnd))
{
ShowWindow(hwnd, SW_SHOWDEFAULT);
UpdateWindow(hwnd);
MSG msg;
ZeroMemory(&msg, sizeof(msg));
while(msg.message != WM_QUIT)
{
if(PeekMessage(&msg, NULL, 0, 0, PM_REMOVE))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
render();
Sleep(10);
}
}
cleanup();
UnregisterClass(CLASS_NAME, wc.hInstance);
return 0;
}