load shaders from Ruby on Window creation

runtime/lib/window.rb

@@ -0,0 +1,24 @@
+class Window
+  def initialize
+    @programs = {}
+    load_shaders
+  end
+
+  private
+
+  def load_shaders
+    program_sources = {
+      text: ["text.v.glsl", "text.f.glsl"],
+      basic: ["basic.v.glsl", "basic.f.glsl"],
+      rect: ["rect.v.glsl", "basic.f.glsl"],
+    }
+
+    program_sources.each do |program, (v_src_fname, f_src_fname)|
+      v_shader = GLShader.new(:vertex, Runtime.read(:shader, v_src_fname))
+      v_shader or raise "Could not find shader #{v_src_fname}"
+      f_shader = GLShader.new(:fragment, Runtime.read(:shader, f_src_fname))
+      f_shader or raise "Could not find shader #{f_src_fname}"
+      @programs[program] = GLProgram.new(v_shader, f_shader)
+    end
+  end
+end