$:.unshift File.expand_path(File.dirname(__FILE__) + "/../../lib")
$:.unshift File.expand_path(File.dirname(__FILE__) + "/../../ext")

require 'ray'

Ray::Game.new("Shaders test") do
  register do
    add_hook :quit, method(:exit!)
  end

  scene :shader do
    img = Ray::Image.new(:w => 100, :h => 100).fill(Ray::Color.green)
    img.draw_line([0, 0], [100, 100], Ray::Color.black, 2)
    img.draw_line([0, 100], [100, 0], Ray::Color.white, 2)
    img.draw_filled_circle([50, 50], 10, Ray::Color.cyan)
    img.update

    shader = Ray::Shader.new StringIO.new(<<-SHADER)
      uniform sampler2D texture;
      uniform vec3      ratio;

      void main() {
        vec4 color = texture2D(texture, gl_TexCoord[0].xy);
        float gray = dot(color.xyz, ratio);

        gl_FragColor = vec4(gray, gray, gray, 1.0);
      }
    SHADER

    shader["texture"] = :current
    shader["ratio"]   = [0.299, 0.587, 0.114]

    render do |win|
      win.fill(Ray::Color.black)

      img.draw(:on => win, :at => [0, 0],     :shader => shader)
      img.draw(:on => win, :at => [100, 100], :shader => nil)
    end
  end

  push_scene :shader
end