Class: BgUtils::Skybox

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

Instance Method Summary collapse

Constructor Details

#initialize(filename) ⇒ Skybox

Returns a new instance of Skybox.



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# File 'lib/bg_utils.rb', line 3

def initialize(filename)
  # filename is supposed to lead to a composed texture like below :

  #   X

  #  XXXX

  #   X


  texture = Gosu::Image.new(filename, :retro=>true)
  @tile_size = texture.width / 4
  texture = nil # we don't need it anymore

  @textures = {
    :y_pos => Gosu::Image.new(filename, :rect => [@tile_size, 0, @tile_size, @tile_size]),
    :x_neg => Gosu::Image.new(filename, :rect => [0, @tile_size, @tile_size, @tile_size]),
    :z_neg => Gosu::Image.new(filename, :rect => [@tile_size, @tile_size, @tile_size, @tile_size]),
    :x_pos => Gosu::Image.new(filename, :rect => [2 * @tile_size, @tile_size, @tile_size, @tile_size]),
    :z_pos => Gosu::Image.new(filename, :rect => [3 * @tile_size, @tile_size, @tile_size, @tile_size]),
    :y_neg => Gosu::Image.new(filename, :rect => [@tile_size, 2 * @tile_size, @tile_size, @tile_size])
  }
  self.gen_list
end

Instance Method Details

#draw(x = 0, y = 0, z = 0, rot_pitch = 0, rot_yaw = 0) ⇒ Object 



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# File 'lib/bg_utils.rb', line 88

def draw(x = 0, y = 0, z = 0, rot_pitch = 0, rot_yaw = 0)   
  glPushMatrix
    glTranslatef(x, y, z)
    glRotatef(rot_pitch, 1, 0, 0)
    glRotatef(rot_yaw, 0, 1, 0)
    glCallList(@display_list)
  glPopMatrix
  
end

#gen_list ⇒ Object 



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# File 'lib/bg_utils.rb', line 33

def gen_list
  @display_list = glGenLists(1)
        glNewList(@display_list, GL_COMPILE)
    glDepthMask(GL_FALSE)
    tex = switch_texture(:z_neg)
    glBegin(GL_QUADS)
      glTexCoord2d(tex.left, tex.top);     glVertex3f(-1, 1, -1)
      glTexCoord2d(tex.left, tex.bottom);  glVertex3f(-1, -1, -1)
      glTexCoord2d(tex.right, tex.bottom);   glVertex3f(1, -1, -1)
      glTexCoord2d(tex.right, tex.top);    glVertex3f(1, 1, -1)
    glEnd
    tex = switch_texture(:z_pos)
    glBindTexture(GL_TEXTURE_2D, tex.tex_name)
    glBegin(GL_QUADS)
      glTexCoord2d(tex.left, tex.top);     glVertex3f(1, 1, 1)
      glTexCoord2d(tex.left, tex.bottom);  glVertex3f(1, -1, 1)
      glTexCoord2d(tex.right, tex.bottom);   glVertex3f(-1, -1, 1)
      glTexCoord2d(tex.right, tex.top);    glVertex3f(-1, 1, 1)
    glEnd
    tex = switch_texture(:x_neg)
    glBindTexture(GL_TEXTURE_2D, tex.tex_name)
    glBegin(GL_QUADS)
      glTexCoord2d(tex.left, tex.top);     glVertex3f(-1, 1, 1)
      glTexCoord2d(tex.left, tex.bottom);  glVertex3f(-1, -1, 1)
      glTexCoord2d(tex.right, tex.bottom);   glVertex3f(-1, -1, -1)
      glTexCoord2d(tex.right, tex.top);    glVertex3f(-1, 1, -1)
    glEnd
    tex = switch_texture(:x_pos)
    glBindTexture(GL_TEXTURE_2D, tex.tex_name)
    glBegin(GL_QUADS)
      glTexCoord2d(tex.left, tex.top);     glVertex3f(1, 1, -1)
      glTexCoord2d(tex.left, tex.bottom);  glVertex3f(1, -1, -1)
      glTexCoord2d(tex.right, tex.bottom);   glVertex3f(1, -1, 1)
      glTexCoord2d(tex.right, tex.top);    glVertex3f(1, 1, 1)
    glEnd
    tex = switch_texture(:y_pos)
    glBindTexture(GL_TEXTURE_2D, tex.tex_name)
    glBegin(GL_QUADS)
      glTexCoord2d(tex.left, tex.top);     glVertex3f(-1, 1, 1)
      glTexCoord2d(tex.left, tex.bottom);  glVertex3f(-1, 1, -1)
      glTexCoord2d(tex.right, tex.bottom);   glVertex3f(1, 1, -1)
      glTexCoord2d(tex.right, tex.top);    glVertex3f(1, 1, 1)
    glEnd
    tex = switch_texture(:y_neg)
    glBindTexture(GL_TEXTURE_2D, tex.tex_name)
    glBegin(GL_QUADS)
      glTexCoord2d(tex.left, tex.top);     glVertex3f(-1, -1, -1)
      glTexCoord2d(tex.left, tex.bottom);  glVertex3f(-1, -1, 1)
      glTexCoord2d(tex.right, tex.bottom);   glVertex3f(1, -1, 1)
      glTexCoord2d(tex.right, tex.top);    glVertex3f(1, -1, -1)
    glEnd
    glDepthMask(GL_TRUE)           
        glEndList
end

#switch_texture(face) ⇒ Object 



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# File 'lib/bg_utils.rb', line 23

def switch_texture(face)
  tex = @textures[face].gl_tex_info
  glBindTexture(GL_TEXTURE_2D, tex.tex_name)
  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST)
  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST)
  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP)
  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP)
  return tex
end