This isn't stricly about games, but since it's about bitmap fonts, I figure that more than a couple of people here would be able to help by giving me a nudge.
I'm having a couple of problems attempting to implement a bitmap font system.
I have an IVideoDriver class (OGL, DX, although I'm only implementing OGL at the moment) and my bitmap font class seperated into IBitmapFont and COpenGLBitmapFont:
/**
* Class representing the basics of a bitmap font.
*/
class IBitmapFont : public IMBase
{
private:
std::string m_name; ///< The name of the font
bool m_bold; ///< If the font is bold
bool m_italic; ///< If the font is italic
bool m_underlined; ///< If the font is underlined
int m_charWidths[96]; ///< The widths of each printable character
HDC m_hdc; ///< The hardware device context
public:
/**
* Constructor
* \param hdc The hardware device context
* \param name The font name we want
* \param italic Whether the font is italic
* \param bold Whether the font is bold
* \param underlined Whether the font is underlined
*/
IBitmapFont(HDC hdc, const char* name, bool italic, bool underlined, bool bold)
: m_hdc(hdc), m_name(name), m_italic(italic), m_bold(bold), m_underlined(underlined)
{
// Get an array of widths for a range of characters
if( !GetCharWidth32(m_hdc, 32, 127, m_charWidths) )
util::Message::print("IBitmapFont:: Unable to load character widths for font \"%s\"", name);
}
/**
* Get the width of a particular character
* \param c The character to get the width of
*/
int getCharWidth(char c)
{
return m_charWidths[c-32]; // because we're not using the first 32 characters (non-printable)
}
};
/**
* Represents a bitmap font in open gl.
*/
class COpenGLBitmapFont : public video::IBitmapFont
{
private:
unsigned int m_fontList; ///< The opengl display list id for the bitmap font
public:
/**
* Constructor
* \param hdc The HDC for the window
* \param name The font name we want
* \param italic Whether the font is italic
* \param bold Whether the font is bold
* \param underlined Whether the font is underlined
*/
COpenGLBitmapFont(HDC hdc, const char* name, bool italic, bool underlined, bool bold )
: IBitmapFont(hdc, name, italic, underlined, bold)
{ }
/**
* Create the font
* \param hdc The hardware device context for creating the font
*/
bool createFont()
{
HFONT font; // Window font id
HFONT oldfont; // Used for good house keeping
m_fontList = glGenLists(96); // Storage for 96 characters
font = CreateFont( -15, // Height of font
8, // Width of font
0, // Angle of escapement
0, // Orientation Angle
FW_NORMAL,// Font weight
m_italic,// Italic
m_underlined,// Underline
m_bold, // Strikeout
ANSI_CHARSET, // Character set identifier
OUT_TT_PRECIS, // Output precision
CLIP_DEFAULT_PRECIS,// Clipping precision
ANTIALIASED_QUALITY,// Output quality
FF_DONTCARE|DEFAULT_PITCH,// Family and pitch
"Arial");// Font name
oldfont = (HFONT) SelectObject(hdc, font); // Selects the font we want
wglUseFontBitmaps(hdc, 32, 96, m_fontList); // Builds 96 characters starting at character 32
SelectObject(hdc, oldfont); // Selects the font we want
DeleteObject(font); // Delete the font
}
};
That's it for the moment, but I'm having a problem with the printing of the text. I initially thought that I could call a function on the bitmap font object, but then I'd have to include the raster position and unless I wanted to always pass a pointer, I'd need a pointer to the VideoDriver inside the bitmap font class. I think that would be going a little too far and too inelegant.
I was just stuck with a thought. What if I just kept all of the created bitmap font objects inside the VideoDriver class and whenever I called "createBitmapFont", it would return a handle (integer, whatever). Then, I could just keep with calling the video driver to draw text.
I think that I'm more inclined to the latter, but I am looking for any better ideas.
Also, just say a have a whole lot of fonts and I'm drawing text with each of them in every rendering frame. I'm using windows, as you could probably tell from the code. When using SelectObject, how quick is it to change fonts? Is it intensive either in time or memory?
[size="2"][size=2]Mort, Duke of Sto Helit: NON TIMETIS MESSOR -- Don't Fear The Reaper
