Class: Mittsu::OpenGLTexture

Inherits:
Object
  • Object
show all
Defined in:
lib/mittsu/renderers/opengl/textures/opengl_texture.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(texture, renderer) ⇒ OpenGLTexture

Returns a new instance of OpenGLTexture.



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# File 'lib/mittsu/renderers/opengl/textures/opengl_texture.rb', line 5

def initialize(texture, renderer)
  @texture = texture
  @renderer = renderer
  @initted = false
end

Instance Attribute Details

#opengl_texture ⇒ Object (readonly)

Returns the value of attribute opengl_texture.



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# File 'lib/mittsu/renderers/opengl/textures/opengl_texture.rb', line 3

def opengl_texture
  @opengl_texture
end

Instance Method Details

#set(slot) ⇒ Object 



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# File 'lib/mittsu/renderers/opengl/textures/opengl_texture.rb', line 11

def set(slot)
  glActiveTexture(GL_TEXTURE0 + slot)

  if @texture.needs_update?
    update
  else
    glBindTexture(GL_TEXTURE_2D, @opengl_texture)
  end
end

#update ⇒ Object 



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# File 'lib/mittsu/renderers/opengl/textures/opengl_texture.rb', line 21

def update
  if !@initted
    @initted = true
    @texture.add_event_listener(:dispose, @renderer.method(:on_texture_dispose))
    @opengl_texture = glCreateTexture
    @renderer.info[:memory][:textures] += 1
  end

  glBindTexture(GL_TEXTURE_2D, @opengl_texture)

  # glPixelStorei(GL_UNPACK_FLIP_Y_WEBGL, texture.flip_y) ???
  # glPixelStorei(GL_UNPACK_PREMULTIPLY_ALPHA_WEBGL, texture.premultiply_alpha) ???
  glPixelStorei(GL_UNPACK_ALIGNMENT, @texture.unpack_alignment)

  image = @texture.image = @renderer.clamp_to_max_size(@texture.image)

  is_image_power_of_two = Math.power_of_two?(image.width) && Math.power_of_two?(image.height)

  set_parameters(GL_TEXTURE_2D, is_image_power_of_two)

  update_specific

  if @texture.generate_mipmaps && is_image_power_of_two
    glGenerateMipmap(GL_TEXTURE_2D)
  end

  @texture.needs_update = false

  @texture.on_update.call if @texture.on_update
end