[PyOpenGL-Users] Texture mapped font. Improve antialiasing

[Prashant S. <ani...@ya...>]

Hi,

I am using texture mapped polygon technique to display
strings on canvas. The texture is in 'tiff' format with alpha channel.
Problem is that the font
is not looking as smooth as it has to.

This is my 'init' function:
    def InitGL(self):
        self.size = self.GetClientSize()
        glEnable(GL_BLEND)
        glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA)
        glEnable(GL_TEXTURE_2D)
        glEnable(GL_LINE_SMOOTH)
        glHint(GL_LINE_SMOOTH_HINT, GL_NICEST)
        glClearColor(0.5, 0.5, 0.5, 0.0)                    
        glDisable(GL_DEPTH_TEST)                
        glShadeModel(GL_SMOOTH)                        
        glMatrixMode(GL_PROJECTION)
        glLoadIdentity()    
        glOrtho( 0.0, self.size.width, self.size.height, 0.0, -1.0, 1.0 )
        glMatrixMode(GL_MODELVIEW)

This is my font texture file loader:

    textureSurface = Image.open(textureFile)
    textureData = textureSurface.convert( "RGBA").tostring()
    width, height = textureSurface.size[0], textureSurface.size[1]
          
    #Bind it to a texture
    textureId = glGenTextures(1)
    fontTexture[0] = textureId
    
    glBindTexture(GL_TEXTURE_2D, textureId)
    
    glTexImage2D( GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0, 
                  GL_RGBA, GL_UNSIGNED_BYTE, textureData )
  
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR)
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR)