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Fast Bitmap fonts...

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Do you want to use a font which is stored in a bitmap or do you want to use the windows bitmap fonts (the .fon) files ?

Sicne the later is odd, I will assume that you want to use a font which is stored in a bitmap. You'll have to

1) create the bitmap - this will be your font texture (you may create an alpha map too)
2) create all the texture coords which are associated with a letter or sign

The bitmap creation is simple. The letters should be on the same line but they must be at the center of each box. The algorithm is :


for each letter
letter_rect is associated to this letter
fixed_y is the y position of the letter line
GetTextExtentPoint32(letter, size);
TextOut(letter_rect.width-size.cx)/2,fixed_y,letter)
end for



Of course, there may be more than one letter line (and therefore more than one fixed_y). But fixed_y should allways be letter_rect.top + fixed_offset.

The texture coords are computed from the different letter_rect.

To use the bitmap font, simply


bind font texture
populate the vertex stream and the index buffer
send them to the GPU
render



Hope I answer your question :) If not, please feel free to explain what you'd like to know.

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