diff --git a/kubi/shaders/colored.frag b/kubi/shaders/colored.frag
index 3e09c7a..b7a0615 100644
--- a/kubi/shaders/colored.frag
+++ b/kubi/shaders/colored.frag
@@ -1,4 +1,6 @@
-#version 150 core
+#version 300 es
+
+precision highp float;
 
 out vec4 out_color;
 uniform vec4 color;
diff --git a/kubi/shaders/colored.vert b/kubi/shaders/colored.vert
index 083513e..c6b3ef8 100644
--- a/kubi/shaders/colored.vert
+++ b/kubi/shaders/colored.vert
@@ -1,4 +1,6 @@
-#version 150 core
+#version 300 es
+
+precision highp float;
 
 in vec3 position;
 uniform mat4 model;
diff --git a/kubi/shaders/gui/progressbar.frag b/kubi/shaders/gui/progressbar.frag
index 1474e79..e598692 100644
--- a/kubi/shaders/gui/progressbar.frag
+++ b/kubi/shaders/gui/progressbar.frag
@@ -1,4 +1,6 @@
-#version 150 core
+#version 300 es
+
+precision highp float;
 
 in vec2 v_uv;
 out vec4 out_color;
diff --git a/kubi/shaders/gui/progressbar.vert b/kubi/shaders/gui/progressbar.vert
index 9d48236..2b43f0c 100644
--- a/kubi/shaders/gui/progressbar.vert
+++ b/kubi/shaders/gui/progressbar.vert
@@ -1,4 +1,4 @@
-#version 150 core
+#version 300 es
 
 in vec2 position;
 out vec2 v_uv;
diff --git a/kubi/shaders/selection_box.frag b/kubi/shaders/selection_box.frag
index 42b54ed..d18a665 100644
--- a/kubi/shaders/selection_box.frag
+++ b/kubi/shaders/selection_box.frag
@@ -1,4 +1,6 @@
-#version 150 core
+#version 300 es
+
+precision highp float;
 
 out vec4 color;
 uniform vec4 u_color;
diff --git a/kubi/shaders/selection_box.vert b/kubi/shaders/selection_box.vert
index f825013..049488d 100644
--- a/kubi/shaders/selection_box.vert
+++ b/kubi/shaders/selection_box.vert
@@ -1,4 +1,6 @@
-#version 150 core
+#version 300 es
+
+precision highp float;
 
 in vec3 position;
 uniform ivec3 u_position;
diff --git a/kubi/shaders/world.frag b/kubi/shaders/world.frag
index 566efaf..f6054c2 100644
--- a/kubi/shaders/world.frag
+++ b/kubi/shaders/world.frag
@@ -1,4 +1,7 @@
-#version 150 core
+#version 300 es
+
+precision highp float;
+precision lowp sampler2DArray;
 
 in vec3 v_normal;
 in vec2 v_uv;
diff --git a/kubi/shaders/world.vert b/kubi/shaders/world.vert
index de3d2e7..996a1ec 100644
--- a/kubi/shaders/world.vert
+++ b/kubi/shaders/world.vert
@@ -1,4 +1,6 @@
-#version 150 core
+#version 300 es
+
+precision highp float;
 
 //TODO pack this data:
 // uint position_normal_uv
diff --git a/kubi/src/events.rs b/kubi/src/events.rs
index b7154da..45fcfff 100644
--- a/kubi/src/events.rs
+++ b/kubi/src/events.rs
@@ -1,6 +1,7 @@
 use glam::UVec2;
-use shipyard::{World, Component, AllStoragesViewMut, SparseSet};
+use shipyard::{World, Component, AllStoragesViewMut, SparseSet, NonSendSync, UniqueView};
 use glium::glutin::event::{Event, DeviceEvent, DeviceId, WindowEvent};
+use crate::rendering::Renderer;
 
 pub mod player_actions;
 
@@ -50,6 +51,19 @@ pub fn process_glutin_events(world: &mut World, event: &Event<'_, ()>) {
   }
 }
 
+pub fn initial_resize_event(
+  mut storages: AllStoragesViewMut,
+) {
+  let (w, h) = {
+    let renderer = storages.borrow::<NonSendSync<UniqueView<Renderer>>>().unwrap();
+    renderer.display.get_framebuffer_dimensions()
+  };
+  storages.add_entity((
+    EventComponent, 
+    WindowResizedEvent(UVec2::new(w, h))
+  ));
+}
+
 pub fn clear_events(
   mut all_storages: AllStoragesViewMut,
 ) {
diff --git a/kubi/src/gui.rs b/kubi/src/gui.rs
index 8662cab..8f78889 100644
--- a/kubi/src/gui.rs
+++ b/kubi/src/gui.rs
@@ -1,6 +1,6 @@
-use shipyard::{Component, Unique, Workload, IntoWorkload, AllStoragesView, AllStoragesViewMut};
-use glam::{Vec2, Vec4, Mat3, vec2, Mat4};
-use crate::{color::color_hex, transform::Transform2d};
+use shipyard::{Component, Unique, Workload, IntoWorkload, AllStoragesView, AllStoragesViewMut, View, UniqueView, NonSendSync, UniqueViewMut, IntoIter};
+use glam::{Vec4, Mat3, vec2, Mat4};
+use crate::{color::color_hex, transform::Transform2d, events::WindowResizedEvent, rendering::Renderer};
 
 pub mod text_widget;
 pub mod progressbar;
@@ -8,7 +8,7 @@ pub mod progressbar;
 use progressbar::{render_progressbars, ProgressbarComponent};
 
 //TODO compute gui scale on window resize
-#[derive(Unique, Clone, Copy, Debug)]
+#[derive(Unique, Clone, Copy, Debug, Default)]
 pub struct GuiView(pub Mat4);
 
 #[derive(Component, Clone, Copy, Debug, Default)]
@@ -30,27 +30,44 @@ impl Default for SecondaryColor {
   }
 }
 
+fn update_gui_view(
+  mut view: UniqueViewMut<GuiView>,
+  resize: View<WindowResizedEvent>,
+) {
+  let Some(&size) = resize.iter().next() else {
+    return
+  };
+  let [w, h] = size.0.to_array();
+  view.0 = Mat4::orthographic_rh_gl(0.0, w as f32, h as f32, 0.0, -1.0, 1.0);
+}
+
+pub fn init_gui(
+  storages: AllStoragesView
+) {
+  storages.add_unique(GuiView::default());
+}
+
+pub fn update_gui() -> Workload {
+  (
+    update_gui_view
+  ).into_workload()
+}
+
 pub fn render_gui() -> Workload {
   (
     render_progressbars
   ).into_workload()
 }
 
-pub fn init_gui(
-  storages: AllStoragesView,
-) {
-  storages.add_unique(GuiView(Mat4::orthographic_rh_gl(0.0, 1.0, 1.0, 0.0, 0.0, 1.0)));
-}
-
 pub fn gui_testing(
   mut storages: AllStoragesViewMut,
 ) {
   storages.add_entity((
     GuiComponent,
     Transform2d(Mat3::from_scale_angle_translation(
-      vec2(0.25, 0.05), 
+      vec2(1920., 16.), 
       0.,
-      vec2(0.5, 0.25)
+      vec2(0., 0.)
     )),
     ProgressbarComponent {
       progress: 0.33
diff --git a/kubi/src/init.rs b/kubi/src/init.rs
index 4f96843..ad6d2b2 100644
--- a/kubi/src/init.rs
+++ b/kubi/src/init.rs
@@ -1,11 +1,17 @@
-use std::net::SocketAddr;
-use shipyard::AllStoragesView;
-use std::env;
+use shipyard::{AllStoragesView, NonSendSync, UniqueView};
+use glium::{Version, Api};
+use std::{env, net::SocketAddr};
 use crate::{
   networking::{GameType, ServerAddress},
-  state::GameState
+  state::GameState, rendering::Renderer
 };
 
+pub fn assert_renderer(
+  renderer: NonSendSync<UniqueView<Renderer>>
+) {
+  assert!(renderer.display.is_glsl_version_supported(&Version(Api::GlEs, 3, 0)), "GLES 3.0 is not supported");
+}
+
 pub fn initialize_from_args(
   all_storages: AllStoragesView,
 ) {
diff --git a/kubi/src/main.rs b/kubi/src/main.rs
index 0440b0b..3505389 100644
--- a/kubi/src/main.rs
+++ b/kubi/src/main.rs
@@ -48,7 +48,7 @@ use settings::load_settings;
 use camera::compute_cameras;
 use events::{
   clear_events, process_glutin_events, 
-  player_actions::generate_move_events
+  player_actions::generate_move_events, initial_resize_event
 };
 use input::{init_input, process_inputs};
 use fly_controller::update_controllers;
@@ -67,11 +67,13 @@ use delta_time::{DeltaTime, init_delta_time};
 use cursor_lock::{insert_lock_state, update_cursor_lock_state, lock_cursor_now};
 use control_flow::{exit_on_esc, insert_control_flow_unique, SetControlFlow};
 use state::{is_ingame, is_ingame_or_loading, is_loading};
-use init::initialize_from_args;
-use gui::{render_gui, init_gui, gui_testing};
+use init::{initialize_from_args, assert_renderer};
+use gui::{render_gui, init_gui, gui_testing, update_gui};
 
 fn startup() -> Workload {
   (
+    assert_renderer,
+    initial_resize_event,
     load_settings,
     load_prefabs,
     init_primitives,
@@ -106,6 +108,7 @@ fn update() -> Workload {
       apply_queued_blocks,
     ).into_workload().run_if(is_ingame),
     compute_cameras,
+    update_gui,
   ).into_workload()
 }
 fn render() -> Workload {