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Re: [ft-devel] freetype opengl texture

From: zill
Subject: Re: [ft-devel] freetype opengl texture
Date: Thu, 9 Aug 2007 15:08:29 -0700 (PDT)

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: 
> 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.
>> -- 
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