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POIssue with Freetype and OpenGL
 

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  1. POIssue with Freetype and OpenGL
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    <p>Hey, i'm having a weird issue with drawing text in openGL loaded with the Freetype 2 library. Here is a screenshot of what I'm seeing.</p> <p><a href="http://img203.imageshack.us/img203/3316/freetypeweird.png" rel="nofollow noreferrer">example http://img203.imageshack.us/img203/3316/freetypeweird.png</a></p> <p>Here are my code bits for loading and rendering my text.</p> <pre><code>class Font { Font(const String&amp; filename) { if (FT_New_Face(Font::ftLibrary, "arial.ttf", 0, &amp;mFace)) { cout &lt;&lt; "UH OH!" &lt;&lt; endl; } FT_Set_Char_Size(mFace, 16 * 64, 16 * 64, 72, 72); } Glyph* GetGlyph(const unsigned char ch) { if(FT_Load_Char(mFace, ch, FT_LOAD_RENDER)) cout &lt;&lt; "OUCH" &lt;&lt; endl; FT_Glyph glyph; if(FT_Get_Glyph( mFace-&gt;glyph, &amp;glyph )) cout &lt;&lt; "OUCH" &lt;&lt; endl; FT_BitmapGlyph bitmap_glyph = (FT_BitmapGlyph)glyph; Glyph* thisGlyph = new Glyph; thisGlyph-&gt;buffer = bitmap_glyph-&gt;bitmap.buffer; thisGlyph-&gt;width = bitmap_glyph-&gt;bitmap.width; thisGlyph-&gt;height = bitmap_glyph-&gt;bitmap.rows; return thisGlyph; } }; </code></pre> <p>The relevant glyph information (width, height, buffer) is stored in the following struct</p> <pre><code>struct Glyph { GLubyte* buffer; Uint width; Uint height; }; </code></pre> <p>And finally, to render it, I have this class called RenderFont.</p> <pre><code>class RenderFont { RenderFont(Font* font) { mTextureIds = new GLuint[128]; mFirstDisplayListId=glGenLists(128); glGenTextures( 128, mTextureIds ); for(unsigned char i=0;i&lt;128;i++) { MakeDisplayList(font, i); } } void MakeDisplayList(Font* font, unsigned char ch) { Glyph* glyph = font-&gt;GetGlyph(ch); glBindTexture( GL_TEXTURE_2D, mTextureIds[ch]); glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_LINEAR); glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_LINEAR); glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, glyph-&gt;width, glyph-&gt;height, 0, GL_ALPHA, GL_UNSIGNED_BYTE, glyph-&gt;buffer); glNewList(mFirstDisplayListId+ch,GL_COMPILE); glBindTexture(GL_TEXTURE_2D, mTextureIds[ch]); glBegin(GL_QUADS); glTexCoord2d(0,1); glVertex2f(0,glyph-&gt;height); glTexCoord2d(0,0); glVertex2f(0,0); glTexCoord2d(1,0); glVertex2f(glyph-&gt;width,0); glTexCoord2d(1,1); glVertex2f(glyph-&gt;width,glyph-&gt;height); glEnd(); glTranslatef(16, 0, 0); glEndList(); } void Draw(const String&amp; text, Uint size, const TransformComponent* transform, const Color32* color) { glEnable(GL_TEXTURE_2D); glEnable(GL_BLEND); glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA); glTranslatef(100, 250, 0.0f); glListBase(mFirstDisplayListId); glCallLists(text.length(), GL_UNSIGNED_BYTE, text.c_str()); glDisable(GL_TEXTURE_2D); glDisable(GL_BLEND); glLoadIdentity(); } private: GLuint mFirstDisplayListId; GLuint* mTextureIds; }; </code></pre> <p>Can anybody see anything weird going on here that would cause the garbled text? It's strange because if I change the font size, or the DPI, then some of the letters that display correctly become garbled, and other letters that were garbled before then display correctly.</p>
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