Class: CyberarmEngine::Texture

Inherits:
Object
  • Object
show all
Defined in:
lib/cyberarm_engine/opengl/texture.rb

Constant Summary collapse

DEFAULT_TEXTURE = 
"#{CYBERARM_ENGINE_ROOT_PATH}/assets/textures/default.png".freeze
CACHE = 
{}

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(path: nil, image: nil, retro: false) ⇒ Texture

Returns a new instance of Texture.



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# File 'lib/cyberarm_engine/opengl/texture.rb', line 19

def initialize(path: nil, image: nil, retro: false)
  raise "keyword :path or :image must be provided!" if path.nil? && image.nil?

  @retro = retro
  @path = path

  if @path
    unless File.exist?(@path)
      warn "Missing texture at: #{@path}"
      @retro = true # override retro setting
      @path = DEFAULT_TEXTURE
    end

    if texture = Texture.from_cache(@path, @retro)
      @id = texture.id
      return
    end

    image = load_image(@path)
    @id = create_from_image(image)
  else
    @id = create_from_image(image)
  end
end

Instance Attribute Details

#id ⇒ Object (readonly)

Returns the value of attribute id.



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# File 'lib/cyberarm_engine/opengl/texture.rb', line 17

def id
  @id
end

Class Method Details

.from_cache(path, retro) ⇒ Object 



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# File 'lib/cyberarm_engine/opengl/texture.rb', line 13

def self.from_cache(path, retro)
  CACHE.dig("#{path}?retro=#{retro}")
end

.release_textures ⇒ Object 



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# File 'lib/cyberarm_engine/opengl/texture.rb', line 7

def self.release_textures
  CACHE.values.each do |id|
    glDeleteTextures(id)
  end
end

Instance Method Details

#create_from_image(image) ⇒ Object 



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# File 'lib/cyberarm_engine/opengl/texture.rb', line 49

def create_from_image(image)
  array_of_pixels = image.to_blob

  tex_names_buf = " " * 4
  glGenTextures(1, tex_names_buf)
  texture_id = tex_names_buf.unpack1("L2")

  glBindTexture(GL_TEXTURE_2D, texture_id)
  glTexImage2D(GL_TEXTURE_2D, 0, GL_SRGB_ALPHA, image.width, image.height, 0, GL_RGBA, GL_UNSIGNED_BYTE, array_of_pixels)
  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT)
  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT)
  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST) if @retro
  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR) unless @retro
  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR)
  glGenerateMipmap(GL_TEXTURE_2D)
  gl_error?

  texture_id
end

#load_image(path) ⇒ Object 



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# File 'lib/cyberarm_engine/opengl/texture.rb', line 44

def load_image(path)
  CACHE["#{path}?retro=#{@retro}"] = self
  Gosu::Image.new(path, retro: @retro)
end