1 files changed, 60 insertions, 0 deletions
diff --git a/engine/src/renderer.rs b/engine/src/renderer.rs
index 79f2bd5..bdbbe0c 100644
--- a/engine/src/renderer.rs
+++ b/engine/src/renderer.rs
@@ -4,9 +4,11 @@ use std::sync::atomic::{AtomicU64, Ordering};
 
 use bitflags::bitflags;
 use ecs::entity::obtainer::Obtainer as EntityObtainer;
+use ecs::event::component::Changed;
 use ecs::pair::{ChildOf, Pair, Wildcard};
 use ecs::phase::{POST_UPDATE as POST_UPDATE_PHASE, Phase};
 use ecs::sole::Single;
+use ecs::system::observer::Observe;
 use ecs::uid::Uid;
 use ecs::{Component, Query, Sole, declare_entity};
 
@@ -25,6 +27,7 @@ use crate::shader::cursor::{
 };
 use crate::texture::Texture;
 use crate::vector::Vec2;
+use crate::windowing::window::Window;
 
 pub mod blending;
 pub mod main_render_pass;
@@ -190,6 +193,11 @@ pub enum Command
     RemoveMesh(ObjectId),
     DrawMesh(ObjectId, DrawMeshOptions),
     UpdateDrawProperties(DrawProperties, DrawPropertiesUpdateFlags),
+    SetViewport
+    {
+        size: Dimens<u32>,
+        position: Vec2<u32>,
+    },
 }
 
 builder! {
@@ -444,6 +452,58 @@ pub fn enqueue_commands_from_render_passes(
     }
 }
 
+#[tracing::instrument(skip_all)]
+fn handle_window_changed(
+    observe: Observe<Pair<Changed, Window>>,
+    entity_obtainer: EntityObtainer,
+)
+{
+    for evt_match in &observe {
+        let window_ent = evt_match.get_ent_infallible();
+
+        let Some(window_surface_spec) = window_ent.get::<SurfaceSpec>() else {
+            continue;
+        };
+
+        let Some(renderer_ctx_ent_id) = window_ent
+            .get_matching_components(
+                Pair::builder()
+                    .relation::<WindowUsingRendererCtx>()
+                    .target_id(Wildcard::uid())
+                    .build()
+                    .id(),
+            )
+            .next()
+            .map(|comp_ref| comp_ref.id().target_entity())
+        else {
+            continue;
+        };
+
+        let Some(renderer_ctx_ent) = entity_obtainer.get_entity(renderer_ctx_ent_id)
+        else {
+            tracing::error!("Renderer context entity does not exist");
+            continue;
+        };
+
+        let Some(mut command_queue) = renderer_ctx_ent.get_mut::<CommandQueue>() else {
+            tracing::error!(
+                "Renderer context entity does not have a {} component",
+                type_name::<CommandQueue>()
+            );
+            continue;
+        };
+
+        command_queue.queue.push_front(Command::SetViewport {
+            position: Vec2 { x: 0, y: 0 },
+            size: *evt_match.get_changed_comp().inner_size(),
+        });
+
+        command_queue
+            .queue
+            .push_front(Command::MakeCurrent(window_surface_spec.id));
+    }
+}
+
 // TODO: Maybe move this struct to somewhere more appropriate
 #[derive(Default, Clone, Component)]
 pub struct PendingShaderBindings