图形系统中为了获得当前运行程序的相关信息，往往需要在屏幕上显示文本，Direct3D的功能扩展接口ID3DXFont对此提供了方便的解决方法。
创建ID3DXFont对象
使用接口ID3DXFont绘制文本，首先需要通过函数D3DXCreateFont()创建ID3DXFont字体对象。ID3DXFont接口封装了Windows字体和Direct3D设备指针，D3DXCreateFont()函数通过Windows字体和Direct3D设备指针创建ID3DXFont对象，该函数的声明如下：
Creates a font object for a device and font.
HRESULT D3DXCreateFont( LPDIRECT3DDEVICE9 pDevice, INT Height, UINT Width, UINT Weight, UINT MipLevels, BOOL Italic, DWORD CharSet, DWORD OutputPrecision, DWORD Quality, DWORD PitchAndFamily, LPCTSTR pFacename, LPD3DXFONT * ppFont);
Parameters
pDevice
[in] Pointer to an IDirect3DDevice9 interface, the device to be associated with the font object.
Height
[in] The height of the characters in logical units.
Width
[in] The width of the characters in logical units.
Weight
[in] Typeface weight. One example is bold.
MipLevels
[in] The number of mipmap levels.
Italic
[in] True for italic font, false otherwise.
CharSet
[in] The character set of the font.
OutputPrecision
[in] Specifies how Windows should attempt to match the desired font sizes and characteristics with actual fonts. Use OUT_TT_ONLY_PRECIS for instance, to ensure that you always get a TrueType font.
Quality
[in] Specifies how Windows should match the desired font with a real font. It applies to raster fonts only and should not affect TrueType fonts.
PitchAndFamily
[in] Pitch and family index.
pFacename
[in] String containing the typeface name. If the compiler settings require Unicode, the data type LPCTSTR resolves to LPCWSTR. Otherwise, the string data type resolves to LPCSTR. See Remarks.
ppFont
[out] Returns a pointer to an ID3DXFont interface, representing the created font object.
Return Values
If the function succeeds, the return value is S_OK. If the function fails, the return value can be one of the following: D3DERR_INVALIDCALL, D3DXERR_INVALIDDATA, E_OUTOFMEMORY.
Remarks
The creation of an ID3DXFont object requires that the device supports 32-bit color.
The compiler setting also determines the function version. If Unicode is defined, the function call resolves to D3DXCreateFontW. Otherwise, the function call resolves to D3DXCreateFontA because ANSI strings are being used.
If you want more information about font parameters, see The Logical Font.
示例代码如下：
D3DXCreateFont(g_device, 50, 20, 20, 0, FALSE, DEFAULT_CHARSET, 0, 0, 0, "Arial", &g_font);
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2008/11/25 15:27:00
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Direct3D中的字体与文本显示(2565字) － 卷积内核，2008年11月25日
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