diff --git a/main.py b/main.py
new file mode 100755
index 0000000..8766b66
--- /dev/null
+++ b/main.py
@@ -0,0 +1,240 @@
+#!/usr/bin/env python
+import kivy
+kivy.require('1.0.7')
+
+from os.path import dirname, isdir, join
+from kivy.animation import Animation
+from kivy.app import App
+from kivy.clock import Clock
+from kivy.core.window import Window
+from kivy.factory import Factory
+from kivy.graphics.fbo import Fbo
+from kivy.graphics import RenderContext
+from kivy.lang import Builder
+from kivy.properties import StringProperty, ObjectProperty, NumericProperty, \
+        BooleanProperty
+from kivy.resources import resource_add_path
+from kivy.uix.floatlayout import FloatLayout
+
+Builder.load_string('''
+<SlideShaderContainer>:
+	canvas:
+		Rectangle:
+			pos: self.pos
+			size: self.size
+			texture: self.fbo_texture
+
+<Slides>:
+	container1: container1
+	container2: container2
+
+    SlidesBackground:
+        slides: root
+
+	SlideShaderContainer:
+		id: container1
+		size_hint_y: None
+		height: root.height - 35
+		y: 35
+
+	SlideShaderContainer:
+		id: container2
+		size_hint_y: None
+		height: root.height - 35
+		y: 35
+
+    SlidesForeground:
+        slides: root
+
+
+<Slide>:
+	pos_hint: {'x': 0, 'y': 0}
+
+''')
+
+fs_default = None
+vs_default = '''
+$HEADER$
+uniform float alpha;
+uniform vec2  size;
+void main (void) {
+  frag_color = color;
+  tex_coord0 = vTexCoords0;
+  vec2 p = vPosition.xy;
+  p.x += alpha * size.x;
+  //p.y += alpha * - size.y;
+  gl_Position = projection_mat * modelview_mat * vec4(p, 0.0, 1.0);
+}
+'''
+
+class SlidesBackground(FloatLayout):
+    slides = ObjectProperty(None)
+
+class SlidesForeground(FloatLayout):
+    slides = ObjectProperty(None)
+
+class Slide(FloatLayout):
+    is_section = BooleanProperty(False)
+    title = StringProperty(None)
+    active = BooleanProperty(False)
+
+class SlideShaderContainer(FloatLayout):
+    alpha = NumericProperty(0.)
+    fbo = ObjectProperty(None)
+    fbo_texture = ObjectProperty(None, allownone=True)
+    vs = StringProperty(vs_default)
+    fs = StringProperty(fs_default)
+
+    def __init__(self, **kwargs):
+        self.fbo = Fbo(size=self.size)
+        self.fbo_texture = self.fbo
+        self.canvas = RenderContext()
+        self.canvas.shader.vs = self.vs
+        self.canvas.shader.fs = self.fs
+        self.canvas.add(self.fbo)
+        Clock.schedule_interval(self.update_shader, 0)
+        super(SlideShaderContainer, self).__init__(**kwargs)
+
+    def _add_widget(self, widget):
+        canvas = self.canvas
+        self.canvas = self.fbo
+        super(SlideShaderContainer, self).add_widget(widget)
+        self.canvas = canvas
+
+    def _remove_widget(self, widget):
+        canvas = self.canvas
+        self.canvas = self.fbo
+        super(SlideShaderContainer, self).remove_widget(widget)
+        self.canvas = canvas
+
+    def on_size(self, instance, value):
+        if value[0] < 1 or value[1] < 1:
+            return
+        self.fbo.size = value
+        self.fbo_texture = self.fbo.texture
+
+    def on_vs(self, instance, value):
+        self.canvas.shader.vs = value
+
+    def on_fs(self, instance, value):
+        self.canvas.shader.fs = value
+
+    def update_shader(self, dt):
+        self.canvas['projection_mat'] = Window.render_context['projection_mat']
+        self.canvas['modelview_mat'] = Window.render_context['modelview_mat']
+        self.canvas['alpha'] = float(self.alpha)
+        self.canvas['size'] = map(float, self.size)
+
+class Slides(FloatLayout):
+    container1 = ObjectProperty(None)
+    container2 = ObjectProperty(None)
+    old_index = NumericProperty(-1)
+    index = NumericProperty(0)
+    scroll_x = NumericProperty(0)
+    time = NumericProperty(0)
+    max_index = NumericProperty(0)
+
+    def __init__(self, **kwargs):
+        self.slides = []
+        super(Slides, self).__init__(**kwargs)
+        Window.bind(on_keyboard=self.on_keyboard)
+        Clock.schedule_interval(self.increase_time, 1 / 30.)
+        Clock.schedule_once(self.init, 0)
+
+    def init(self, dt):
+        index = self.index
+        self.index = -1
+        self.index = index
+
+    def increase_time(self, dt):
+        self.time += dt
+
+    def on_keyboard(self, instance, scancode, *largs):
+        # page down
+        if scancode == 281:
+            self.old_index = self.index
+            for index in xrange(self.index+1, self.max_index):
+                slide = self.slides[index]
+                if slide.is_section:
+                    self.index = index
+                    return True
+            return True
+        # page up
+        if scancode == 280:
+            self.old_index = self.index
+            for index in xrange(self.index-1, -1, -1):
+                slide = self.slides[index]
+                if slide.is_section:
+                    self.index = index
+                    return True
+            return True
+        # home
+        if scancode == 278:
+            self.old_index = self.index
+            self.index = 0
+            return True
+        # end
+        if scancode == 279:
+            self.old_index = self.index
+            self.index = self.max_index - 1
+            return True
+        # left key
+        if scancode == 275:
+            self.old_index = self.index
+            self.index = min(self.max_index - 1, self.index + 1)
+            return True
+        # right key
+        if scancode == 276:
+            self.old_index = self.index
+            self.index = max(0, self.index - 1)
+            return True
+
+    def add_widget(self, widget):
+        if isinstance(widget, Slide):
+            self.slides.append(widget)
+            self.max_index = len(self.slides)
+            return
+        return super(Slides, self).add_widget(widget)
+
+    def on_index(self, instance, value):
+        index = self.index
+        old_index = self.old_index
+        if index == old_index:
+            return
+        self.container2.clear_widgets()
+        self.container2.add_widget(self.slides[index])
+        d = 1. if index > old_index else -1.
+        self.container2.alpha = d
+        Animation(alpha=0., d=.3, t='out_quad').start(self.container2)
+        self.slides[index].active = True
+        if old_index != -1:
+            self.container1.clear_widgets()
+            self.container1.add_widget(self.slides[old_index])
+            self.container1.alpha = 0.
+            Animation(alpha=-d, d=.3, t='out_quad').start(self.container1)
+            self.slides[old_index].active = False
+
+class SlidesViewer(App):
+    def build(self):
+        filename = self.options['filename']
+        if isdir(filename):
+            directory = filename
+            filename = join(filename, 'presentation.kv')
+        else:
+            directory = dirname(filename)
+        sys.path += [directory]
+        resource_add_path(directory)
+        return Builder.load_file(filename)
+
+Factory.register('SlideShaderContainer', cls=SlideShaderContainer)
+Factory.register('Slides', cls=Slides)
+Factory.register('SlidesBackground', cls=SlidesBackground)
+Factory.register('SlidesForeground', cls=SlidesForeground)
+Factory.register('Slide', cls=Slide)
+
+if __name__ == '__main__':
+    import sys
+    if len(sys.argv) != 2:
+        print 'Usage: main.py <filename.kv>'
+        sys.exit(1)
+    SlidesViewer(filename=sys.argv[1]).run()