class CyberarmEngine::Texture

Constants

CACHE
DEFAULT_TEXTURE

Attributes

id[R]

Public Class Methods

from_cache(path, retro) click to toggle source
# File lib/cyberarm_engine/opengl/texture.rb, line 13
def self.from_cache(path, retro)
  CACHE.dig("#{path}?retro=#{retro}")
end
new(path: nil, image: nil, retro: false) click to toggle source
# 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
release_textures() click to toggle source
# File lib/cyberarm_engine/opengl/texture.rb, line 7
def self.release_textures
  CACHE.values.each do |id|
    glDeleteTextures(id)
  end
end

Public Instance Methods

create_from_image(image) click to toggle source
# 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) click to toggle source
# 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