text: """
  
  RenderPipeline
  
  Copyright (c) 2014-2016 tobspr <tobias.springer1@gmail.com>
  
  Permission is hereby granted, free of charge, to any person obtaining a copy
  of this software and associated documentation files (the "Software"), to deal
  in the Software without restriction, including without limitation the rights
  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  copies of the Software, and to permit persons to whom the Software is
  furnished to do so, subject to the following conditions:
  
  The above copyright notice and this permission notice shall be included in
  all copies or substantial portions of the Software.
  
  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  THE SOFTWARE.
  
  """
  
  from panda3d.core import Vec3
  
  from rpcore.image import Image
  from rpcore.gui.draggable_window import DraggableWindow
  from rpcore.gui.sprite import Sprite
  from rpcore.gui.text import Text
  from rpcore.gui.slider import Slider
  from rpcore.gui.labeled_checkbox import LabeledCheckbox
  
  from rpcore.util.display_shader_builder import DisplayShaderBuilder
  
  
  class TexturePreview(DraggableWindow):
  
      """ Small window which provides a preview of a texture """
      def __init__(self, pipeline, parent):
          DraggableWindow.__init__(self, width=1600, height=900, parent=parent,
                                   title="Texture Viewer")
          self._pipeline = pipeline
          self._current_tex = None
          self._mip_slider = None
          self._mip_text = None
          self._slice_slider = None
          self._slice_text = None
          self._preview_image = None
          self._create_components()
  
      def present(self, tex):
          """ "Presents" a given texture and shows the window """
          self._current_tex = tex
  
          self.set_title(tex.get_name())
  
          # tex.write(tex.get_name() + ".png")
  
          # Remove old content
          self._content_node.node().remove_all_children()
  
          w, h = tex.get_x_size(), tex.get_y_size()
          if h > 1:
              scale_x = (self._width - 40.0) / w
              scale_y = (self._height - 110.0) / h
              scale_f = min(scale_x, scale_y)
              display_w = scale_f * w
              display_h = scale_f * h
  
          else:
              display_w = self._width - 40
              display_h = self._height - 110
  
          image = Sprite(
              image=tex, parent=self._content_node, x=20, y=90, w=display_w,
              h=display_h, any_filter=False, transparent=False)
          description = ""
  
          # Image size
          description += "{:d} x {:d} x {:d}".format(
              tex.get_x_size(), tex.get_y_size(), tex.get_z_size())
  
          # Image type
          description += ", {:s}, {:s}".format(
              Image.format_format(tex.get_format()).upper(),
              Image.format_component_type(tex.get_component_type()).upper())
  
          Text(text=description, parent=self._content_node, x=17, y=70,
               size=16, color=Vec3(0.6, 0.6, 0.6))
  
          estimated_bytes = tex.estimate_texture_memory()
          size_desc = "Estimated memory: {:2.2f} MB".format(
              estimated_bytes / (1024.0 ** 2))
  
          Text(text=size_desc, parent=self._content_node, x=self._width - 20.0,
               y=70, size=18, color=Vec3(0.34, 0.564, 0.192), align="right")
  
          x_pos = len(size_desc) * 9 + 140
  
          # Slider for viewing different mipmaps
          if tex.uses_mipmaps():
              max_mips = tex.get_expected_num_mipmap_levels() - 1
              self._mip_slider = Slider(
                  parent=self._content_node, size=140, min_value=0, max_value=max_mips,
                  callback=self._set_mip, x=x_pos, y=65, value=0)
              x_pos += 140 + 5
  
              self._mip_text = Text(
                  text="MIP: 5", parent=self._content_node, x=x_pos, y=72, size=18,
                  color=Vec3(1, 0.4, 0.4), may_change=1)
              x_pos += 50 + 30
  
          # Slider for viewing different Z-layers
          if tex.get_z_size() > 1:
              self._slice_slider = Slider(
                  parent=self._content_node, size=250, min_value=0,
                  max_value=tex.get_z_size() - 1, callback=self._set_slice, x=x_pos,
                  y=65, value=0)
              x_pos += 250 + 5
  
              self._slice_text = Text(
                  text="Z: 5", parent=self._content_node, x=x_pos, y=72, size=18,
                  color=Vec3(0.4, 1, 0.4), may_change=1)
  
              x_pos += 50 + 30
  
          # Slider to adjust brightness
          self._bright_slider = Slider(
              parent=self._content_node, size=140, min_value=-14, max_value=14,
              callback=self._set_brightness, x=x_pos, y=65, value=0)
          x_pos += 140 + 5
          self._bright_text = Text(
              text="Bright: 1", parent=self._content_node, x=x_pos, y=72, size=18,
              color=Vec3(0.4, 0.4, 1), may_change=1)
          x_pos += 100 + 30
  
          # Slider to enable reinhard tonemapping
          self._tonemap_box = LabeledCheckbox(
              parent=self._content_node, x=x_pos, y=60, text="Tonemap",
              text_color=Vec3(1, 0.4, 0.4), chb_checked=False,
              chb_callback=self._set_enable_tonemap,
              text_size=18, expand_width=90)
          x_pos += 90 + 30
  
          image.set_shader_inputs(
              slice=0,
              mipmap=0,
              brightness=1,
              tonemap=False)
  
          preview_shader = DisplayShaderBuilder.build(tex, display_w, display_h)
          image.set_shader(preview_shader)
  
          self._preview_image = image
          self.show()
  
      def _set_slice(self):
          idx = int(self._slice_slider.value)
          self._preview_image.set_shader_input("slice", idx)
          self._slice_text.set_text("Z: " + str(idx))
  
      def _set_mip(self):
          idx = int(self._mip_slider.value)
          self._preview_image.set_shader_input("mipmap", idx)
          self._mip_text.set_text("MIP " + str(idx))
  
      def _set_brightness(self):
          val = self._bright_slider.value
          scale = 2 ** val
          self._bright_text.set_text("Bright: " + str(round(scale, 3)))
          self._preview_image.set_shader_input("brightness", scale)
  
      def _set_enable_tonemap(self, enable_tonemap):
          self._preview_image.set_shader_input("tonemap", enable_tonemap)
  
      def _create_components(self):
          """ Internal method to init the components """
          DraggableWindow._create_components(self)
          self._content_node = self._node.attach_new_node("content")
  