Re: [ft-devel] freetype opengl texture

[David Turner]

what is the result of using:

glTexImage2D(GL_TEXTURE_2D, 0, 1, 30, 30, 0, GL_ALPHA, GL_UNSIGNED_BYTE,
>> &ft_face->glyph->bitmap);

with a FT_RENDER_MODE_NORMAL ?

Just trying to guess something that might help you

- David


On Thu, 9 Aug 2007 15:08:29 -0700 (PDT), "zill" <address@hidden> said:
> 
> I'm still pretty confused then.  First, I changed to FT_RENDER_MODE_LCD
> because I don't see where what type I would use for a 256 gray scale. 
> I'm
> also using GL_RGB.  From the description I read, it seems that should
> work,
> but I'm just getting a plain white square.  It seems that nothing is
> happening.  I would expect to at least have some sort of screwed up
> image. 
> That tells me that nothing is happening to ft_face->glyph->bitmap.  My gl
> function might need changed, but I think the plain white texture is proof
> that FT_Render_Glyph isn't doing what I want it to.
> 
> I followed everything that I read from freetype (granted it doesn't tell
> you
> how to use it with openGL) so I think I'm using the freetype functions
> right.  But nothing is happening to the glyph's bitmap.
> 
> Does anyone see what I'm doing wrong?
> 
> 
> David Turner-5 wrote:
> > 
> > Hello,
> > 
> > I thought the documentation made it clear that FT_RENDER_MODE_NORMAL
> > corresponds
> > to 8-bit gray maps with 256 levels of "gray"
> > 
> > see: 
> > 
> > http://www.freetype.org/freetype2/docs/reference/ft2-base_interface.html#FT_Render_Mode
> > 
> > hope this helps,
> > - David
> > 
> > On Thu, 9 Aug 2007 10:00:28 -0700 (PDT), "zill" <address@hidden> said:
> >> 
> >> I loaded the glyph exactly how freetype explains:
> >> 
> >> FT_UInt glyph_index = FT_Get_Char_Index(ft_face, c);
> >> FT_UInt error = FT_Load_Glyph(ft_face, glyph_index, FT_LOAD_DEFAULT);
> >> if (error) { return false }
> >> error = FT_Render_Glyph(ft_face->glyph, FT_RENDER_MODE_NORMAL);
> >> if (error) { return false }
> >> 
> >> glGenTextures(1, &texture);
> >> glBindTexture(GL_TEXTURE_2D, texture);
> >> glTexImage2D(GL_TEXTURE_2D, 0, 3, 30, 30, 0, GL_RGBA, GL_UNSIGNED_BYTE,
> >> &ft_face->glyph->bitmap);
> >> 
> >> Then I try to load it into a texture, but it doesn't work.  I don't see
> >> anywhere in freetype where it says what type of bitmap the glyphs are
> >> (RGB,
> >> RGBA, etc...) and I'm only using 30 so that I know the glyph will fit
> >> into
> >> the texture, since the font size is set to 16.  Can anyone tell me what
> >> I've
> >> done wrong.  I don't see what it could be.
> >> 
> >> Thank you.
> >> -- 
> >> View this message in context:
> >> http://www.nabble.com/freetype-opengl-texture-tf4243821.html#a12076307
> >> Sent from the Freetype - Dev mailing list archive at Nabble.com.
> >> 
> >> 
> >> 
> >> _______________________________________________
> >> Freetype-devel mailing list
> >> address@hidden
> >> http://lists.nongnu.org/mailman/listinfo/freetype-devel
> > 
> > 
> > _______________________________________________
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> > 
> > 
> 
> -- 
> View this message in context:
> http://www.nabble.com/freetype-opengl-texture-tf4243821.html#a12081478
> Sent from the Freetype - Dev mailing list archive at Nabble.com.
> 
> 
> 
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