Re: [ft-devel] freetype opengl texture

[zill]

I'm still getting a white square which is leading me to believe that there is
something wrong with the FreeType code.  I should be able to figure out the
gl code as soon as I can figure out how to get the FreeType to work.  I
don't see what I'm doing wrong since I followed the explanation word for
word.  But obviously there is something.



David Turner-5 wrote:
> 
> 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
>> > 
>> > 
>> > _______________________________________________
>> > Freetype-devel mailing list
>> > address@hidden
>> > http://lists.nongnu.org/mailman/listinfo/freetype-devel
>> > 
>> > 
>> 
>> -- 
>> 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.
>> 
>> 
>> 
>> _______________________________________________
>> Freetype-devel mailing list
>> address@hidden
>> http://lists.nongnu.org/mailman/listinfo/freetype-devel
> 
> 
> _______________________________________________
> Freetype-devel mailing list
> address@hidden
> http://lists.nongnu.org/mailman/listinfo/freetype-devel
> 
> 

-- 
View this message in context: 
http://www.nabble.com/freetype-opengl-texture-tf4243821.html#a12083492
Sent from the Freetype - Dev mailing list archive at Nabble.com.