Added canvas_size_changed 'event' to Renderer and OpenGLRenderer

lib/renderer/g_buffer.rb

@@ -151,15 +151,13 @@ class IMICFPS
     end
 
     def clean_up
-      glDeleteFramebuffers(@framebuffer)
+      glDeleteFramebuffers(1, [@framebuffer].pack("L"))
 
-      @textures.values.each do |id|
-        glDeleteTextures(id)
-      end
+      glDeleteTextures(@textures.values.size, @textures.values.pack("L*"))
 
-      glDeleteBuffers(@positions_buffer_id)
-      glDeleteBuffers(@uvs_buffer_id)
-      glDeleteVertexArrays(@screen_vbo)
+      glDeleteBuffers(2, [@positions_buffer_id, @uvs_buffer_id].pack("L*"))
+      glDeleteVertexArrays(1, [@screen_vbo].pack("L"))
+      gl_error?
     end
   end
 end

lib/renderer/opengl_renderer.rb

@@ -8,8 +8,15 @@ class IMICFPS
       @g_buffer = GBuffer.new
     end
 
+    def canvas_size_changed
+      @g_buffer.unbind_framebuffer
+      @g_buffer.clean_up
+
+      @g_buffer = GBuffer.new
+    end
+
     def render(camera, lights, entities)
-      if Shader.available?("default")
+      if Shader.available?("default") && Shader.available?("render_screen")
         @g_buffer.bind_for_writing
         gl_error?
 

lib/renderer/renderer.rb

@@ -28,6 +28,10 @@ class IMICFPS
       @opengl_renderer.render(camera, lights, entities)
     end
 
+    def canvas_size_changed
+      @opengl_renderer.canvas_size_changed
+    end
+
     def finalize # cleanup
     end
   end