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font system for OpenGL 2D for commerical projects (Forums : 2D Graphics : font system for OpenGL 2D for commerical projects) Locked
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Sep 18 2012, 7:52am Anchor

Anyone want to point me in the right direction for a free easy to use font system for my OpenGL engine? I also need to make sure it can be used for commercial projects.

Does anyone know if BMP image format  is allowed to be used for commercial games?

Sep 18 2012, 11:54am Anchor

BMP can, yes, but normally TGA is the preferred format.

Not sure about  the font system.  All id gpl engines have a font system, maybe lift it from there (your code would be GPL though).

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Jok3r098
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Sep 18 2012, 1:11pm Anchor

there are open source GUI systems like GWEN which afaik could probably be used in commercial applications.;
but its not overly hard to write your own. something like this:

cpp code:
int textSheetHandle;
void init(){
   textSheetHandle = loadTextSpriteSheet();
}
void drawLetter(char ch, float x, float y){
   //Work out where on the spritesheet the letter is, for example take the ascii value as the index on the sheet.
   int sheetx, sheety;
   sheety = (int)((int)ch/16); // ascii value / total number of cols.
   sheetx = (int)ch - sheety;
   glTranslatef(x, y, 0.0f);
   glBegin(GL_QUADS);    
   glTexCoord2f( sheetx, sheety );                        
   glVertex2f( 0, 0 );

   glTexCoord2f( sheetx+characterWidth, sheety);
   glVertex2f( characterWidth, 0 );

   glTexCoord2f( characterWidth, characterHeight );
   glVertex2f( characterWidth, characterHeight );
                         
   glTexCoord2f( sheetx, characterHeight);        
   glVertex2f( 0, characterHeight);                
   glEnd();
   return;
}
void drawString(float x, float y, string instr){
   glBindTexture(GL_TEXTURE_2D, textSheetHandle);
   foreach letter in instr:
        drawLetter(letter, x + (numCharactersSoFar*characterWidth), y);
return;
}

 obviously you might want to do some more complacated stuff like carriage returns, or putting the string into a vertex buffer so its faster to draw next time, etc, but that shouldn't be too difficult to do.

Sep 21 2012, 11:52pm Anchor

this perhaps www.libsdl.org or www.freetype.org

Edited by: vfn4i83

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