gistfile1.rb

class Mesh
  # ...
  def draw
    @meshes.each.with_index{|(vao, gl_type, faces_count),mesh_index|
      GL.glBindTexture(GL::GL_TEXTURE_2D, @tex_ids[mesh_index]) if @tex_ids[mesh_index]
      GL.glBindVertexArray(vao)
      GL.glDrawElements(gl_type, faces_count, GL::GL_UNSIGNED_SHORT, 0)
    } 
  end
  # ...
end


w.draw_callback = proc{
  GL.glClearColor(0.0, 0.0, 0.0, 0.0)
  GL.glClearDepth(1.0) 
  GL.glClear(GL::GL_COLOR_BUFFER_BIT | GL::GL_DEPTH_BUFFER_BIT)
  
  camera_matrix = MatrixStack.new( camera.look_at_matrix )
  
  program.use{
    GL.glUniformMatrix4fv(program.uniform_location('worldToCameraMatrix'), 1, GL::GL_FALSE, camera_matrix.top_pointer)
    meshes.each{|mesh|
      GL.glUniformMatrix4fv(program.uniform_location('modelToWorldMatrix'), 1, GL::GL_FALSE, mesh.model_matrix_pointer)
      mesh.draw
    } 
  } 
  
 w.swap_buffers
}