Class: FontStore

Inherits:
Object
  • Object
show all
Defined in:
lib/gl_tail/font_store.rb

Constant Summary collapse

WIDTH = 
8 / 256.0
HEIGHT = 
13 / 256.0

Class Method Summary collapse

Class Method Details

.generate_font ⇒ Object 



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# File 'lib/gl_tail/font_store.rb', line 69

def self.generate_font
  self.generate_textures
  return

  # Ignore the rest for now, used only to create font.bin

#    glPushMatrix
#    glViewport(0, 0, 8, 15)
#    glMatrixMode(GL_PROJECTION)
#    glLoadIdentity()

#    glOrtho(0, 8, 13, 0, -1.0, 1.0)

#    glMatrixMode(GL_MODELVIEW)
#    glLoadIdentity()
#    glTranslate(0, 0, 0)

#    glMaterial(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, ( [1.0, 1.0, 1.0, 1.0]  ) )
#    32.upto(255) do |c|
#      glClearColor(0.0, 0.0, 0.0, 1.0)
#      glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT)

#      glRasterPos(0,0)
#      begin
#        glutBitmapCharacter(GLUT_BITMAP_8_BY_13, c)
#      rescue RangeError
#        glutBitmapCharacterX(c)
#      end

#      glBindTexture(GL_TEXTURE_2D, @textures[c])
#      glCopyTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, 0, 13, 8, 13, 0)


#      glBindTexture(GL_TEXTURE_2D, 0)
#    end
#    glClearColor(0.0, 0.0, 0.0, 1.0)
#    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT)

#    glPopMatrix

end

.generate_textures ⇒ Object 



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# File 'lib/gl_tail/font_store.rb', line 12

def self.generate_textures
  if @font_texture.nil?
    @font_texture = glGenTextures(1)[0]

    File.open("#{File.dirname(__FILE__)}/font.bin") do |f|
      @font = Marshal.load(f)
    end

    font_data = []

    # Add missing pixels to increase height by 3
    32.upto(255) do |c|
      @font[c] += @font[c] + [0,0,0].pack("C*") * 24
    end

    0.upto(196607) do |i|
      font_data[i] = 0
    end

    # Re-order bitmap data into one 256x256 texture
    32.upto(255) do |c|
      row = (c - 32) / 16
      col = (c - 32) % 16

      offset = row * 256*16*3 + col*8*3
      0.upto(15) do |y|
        0.upto(7) do |x|
          font_data[offset + y*256*3 + x*3 +0] = @font[c][y*8*3 + x*3 + 0]
          font_data[offset + y*256*3 + x*3 +1] = @font[c][y*8*3 + x*3 + 1]
          font_data[offset + y*256*3 + x*3 +2] = @font[c][y*8*3 + x*3 + 2]
        end
      end

    end

#      File.open("lib/font_256.bin", "wb") do |f|
#        Marshal.dump(font_data, f)
#      end

    font_data = font_data.pack("C*")

    glBindTexture(GL_TEXTURE_2D, @font_texture)
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST)
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST)
#      glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR)
#      glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR)
#      glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP)
#      glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP)
    glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE)
    #    glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_DECAL)
#    glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE)
    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, 256, 256, 0, GL_RGB, GL_UNSIGNED_BYTE, font_data)

    glBindTexture(GL_TEXTURE_2D, 0)
  end
end

.render_char(engine, c, pos) ⇒ Object 



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# File 'lib/gl_tail/font_store.rb', line 111

def self.render_char(engine, c, pos)
  char_size = engine.char_size

  base = c-32

  offsetx = ((base%16) ) / (32.0)
  offsety = ((base/16) * 16) / (256.0)


  pos_offset = char_size * pos

  glTexCoord2f(offsetx,offsety)
  glNormal3f(1.0, 1.0, 0.0)
  glVertex3f(pos_offset, 0, 0.0)

  glTexCoord2f(offsetx+WIDTH,offsety)
  glNormal3f(1.0, 1.0, 0.0)
  glVertex3f(pos_offset + char_size, 0.0, 0.0)

  glTexCoord2f(offsetx+WIDTH,offsety + HEIGHT)
  glNormal3f(1.0, 1.0, 0.0)
  glVertex3f(pos_offset + char_size, engine.line_size, 0.0)

  glTexCoord2f(offsetx,offsety + HEIGHT)
  glNormal3f(1.0, 1.0, 0.0)
  glVertex3f(pos_offset, engine.line_size, 0.0)
end

.render_string(engine, left, right = nil) ⇒ Object 



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# File 'lib/gl_tail/font_store.rb', line 140

def self.render_string(engine, left, right = nil)
  glPushMatrix
  glEnable(GL_BLEND)
  glBlendFunc(GL_ONE, GL_ONE)
  glBindTexture(GL_TEXTURE_2D, @font_texture)

  pos = 0

  unless BlobStore.has(left)
    list = glGenLists(1)
    glNewList(list, GL_COMPILE)
    glBegin(GL_QUADS)
    left.each_byte do |c|
      self.render_char(engine, c, pos) unless c == 32
      pos += 1
    end
    glEnd
    glEndList
    BlobStore.put(left,list)
  else
    pos += left.length
  end 
  glCallList(BlobStore.get(left))

  unless BlobStore.has(right) || right.nil?
    list = glGenLists(1)
    glNewList(list, GL_COMPILE)
    glBegin(GL_QUADS)
    right.each_byte do |c|
      self.render_char(engine, c, pos)
      pos += 1
    end
    glEnd
    glEndList
    BlobStore.put(right,list)
  end
  glCallList(BlobStore.get(right)) unless right.nil?
  
  glBindTexture(GL_TEXTURE_2D, 0)
  glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA)
  glDisable(GL_BLEND)
  glPopMatrix
end