Module: Stagecraft::Renderer::Shaders

Defined in:
lib/stagecraft/renderer/shaders.rb

Constant Summary collapse

ROOT = 
File.expand_path("shaders", __dir__)
DIRECTIVE = 
%r{\A\s*//#(if|else|endif|include)\b(?:\s+["']?([^"'\s]+)["']?)?\s*\z}

Class Method Summary collapse

Class Method Details

.clear_cache ⇒ Object 



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# File 'lib/stagecraft/renderer/shaders.rb', line 17

def clear_cache
  @cache = {}
end

.compose(name, defines: Set.new) ⇒ Object 



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# File 'lib/stagecraft/renderer/shaders.rb', line 11

def compose(name, defines: Set.new)
  @cache ||= {}
  key = [name.to_s, defines.to_a.map(&:to_s).sort].freeze
  @cache[key] ||= process(read(name), defines.map(&:to_s).to_set, [name.to_s]).freeze
end

.read(name) ⇒ Object

Raises:

  • (ArgumentError) 


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# File 'lib/stagecraft/renderer/shaders.rb', line 21

def read(name)
  path = File.expand_path(name.to_s, ROOT)
  raise ArgumentError, "shader path escapes shader root" unless path.start_with?("#{ROOT}/")
  raise ArgumentError, "shader not found: #{name}" unless File.file?(path)

  File.read(path)
end