Fix window resize stretching the canvas instead of resizing the sketch surface (#127)

crates/processing_glfw/src/lib.rs

@@ -13,7 +13,7 @@ use processing_core::error::Result;
 use processing_input::{
     input_cursor_grab_mode, input_cursor_visible, input_flush, input_set_char,
     input_set_cursor_enter, input_set_cursor_leave, input_set_focus, input_set_key,
-    input_set_mouse_button, input_set_mouse_move, input_set_scroll,
+    input_set_mouse_button, input_set_mouse_move, input_set_scroll, input_window_resize,
 };
 use processing_render::surface::{MonitorWorkarea, WindowControls};
 
@@ -256,6 +256,7 @@ impl GlfwContext {
             }
         };
 
+        let mut pending_resize: Option<(i32, i32)> = None;
         for (_, event) in glfw::flush_messages(&self.events) {
             match event {
                 WindowEvent::Close => {
@@ -300,6 +301,10 @@ impl GlfwContext {
                 WindowEvent::Focus(focused) => {
                     input_set_focus(surface, focused).unwrap();
                 }
+                WindowEvent::Size(width, height) => {
+                    // A drag delivers many Size events per poll; keep only the last and apply it once after the loop.
+                    pending_resize = Some((width, height));
+                }
                 _ => {}
             }
         }
@@ -309,6 +314,12 @@ impl GlfwContext {
             return false;
         }
 
+        // Apply the coalesced resize once, the WindowResized message and Window change are processed this poll.
+        if let Some((width, height)) = pending_resize {
+            input_window_resize(surface, width as f32, height as f32).unwrap();
+            processing_render::surface_resize(surface, width as u32, height as u32).unwrap();
+        }
+
         let Ok(_) = input_flush() else {
             return false;
         };
@@ -355,6 +366,9 @@ impl GlfwContext {
             Ok(())
         });
         self.last_applied.position = frame_pos;
+
+        let (w, h) = self.window.get_size();
+        self.last_applied.size = bevy::math::UVec2::new(w.max(0) as u32, h.max(0) as u32);
     }
 
     #[cfg(not(feature = "wayland"))]
@@ -529,8 +543,8 @@ fn read_desired_window(surface: Entity) -> Option<DesiredWindow> {
                 _ => None,
             },
             size: bevy::math::UVec2::new(
-                window.resolution.physical_width(),
-                window.resolution.physical_height(),
+                window.resolution.width() as u32,
+                window.resolution.height() as u32,
             ),
             visible: window.visible,
             resizable: window.resizable,

crates/processing_input/src/lib.rs

@@ -8,7 +8,7 @@ use bevy::input::mouse::{
 };
 use bevy::input::touch::TouchPhase;
 use bevy::prelude::*;
-use bevy::window::CursorMoved;
+use bevy::window::{CursorMoved, WindowResized};
 
 use processing_core::app_mut;
 use processing_core::error;
@@ -342,3 +342,14 @@ pub fn input_mouse_scrolled() -> error::Result<bool> {
         Ok(d.x != 0.0 || d.y != 0.0)
     })
 }
+
+pub fn input_window_resize(surface: Entity, width: f32, height: f32) -> error::Result<()> {
+    app_mut(|app| {
+        app.world_mut().write_message(WindowResized {
+            window: surface,
+            width,
+            height,
+        });
+        Ok(())
+    })
+}

crates/processing_pyo3/src/lib.rs

@@ -120,13 +120,12 @@ pub(crate) fn reset_tracked_globals() {
 fn sync_globals(module: &Bound<'_, PyModule>, globals: &Bound<'_, PyAny>) -> PyResult<()> {
     let graphics =
         get_graphics(module)?.ok_or_else(|| PyRuntimeError::new_err("call size() first"))?;
-    input::sync_globals(
-        globals,
-        graphics.surface.entity,
-        graphics.width,
-        graphics.height,
-    )?;
-    surface::sync_globals(globals, &graphics.surface, graphics.width, graphics.height)?;
+    let width = ::processing::prelude::surface_width(graphics.surface.entity)
+        .map_err(|e| PyRuntimeError::new_err(format!("{e}")))?;
+    let height = ::processing::prelude::surface_height(graphics.surface.entity)
+        .map_err(|e| PyRuntimeError::new_err(format!("{e}")))?;
+    input::sync_globals(globals, graphics.surface.entity, width, height)?;
+    surface::sync_globals(globals, &graphics.surface, width, height)?;
     time::sync_globals(globals)?;
     Ok(())
 }

crates/processing_render/src/graphics.rs

@@ -117,7 +117,8 @@ impl CameraProjection for ProcessingProjection {
     fn update(&mut self, _width: f32, _height: f32) {
         // this gets called with the render target's physical dimensions (i.e. accounting for
         // scale factor), but our projection is in logical pixel units
-        // TODO: handle resizes?
+        self.width = _width;
+        self.height = _height;
     }
 
     fn far(&self) -> f32 {

crates/processing_render/src/lib.rs

@@ -1702,6 +1702,24 @@ pub fn surface_physical_height(entity: Entity) -> error::Result<u32> {
     })
 }
 
+pub fn surface_width(entity: Entity) -> error::Result<u32> {
+    app_mut(|app| {
+        Ok(app
+            .world_mut()
+            .run_system_cached_with(surface::width, entity)
+            .unwrap())
+    })
+}
+
+pub fn surface_height(entity: Entity) -> error::Result<u32> {
+    app_mut(|app| {
+        Ok(app
+            .world_mut()
+            .run_system_cached_with(surface::height, entity)
+            .unwrap())
+    })
+}
+
 pub fn monitor_list() -> error::Result<Vec<Entity>> {
     app_mut(|app| Ok(app.world_mut().run_system_cached(monitor::list).unwrap()))
 }

crates/processing_render/src/surface.rs

@@ -21,13 +21,14 @@
 use bevy::{
     app::{App, Plugin},
     asset::Assets,
+    camera::RenderTarget,
     ecs::query::QueryEntityError,
     math::{IRect, IVec2},
     prelude::{Commands, Component, Entity, In, Query, ResMut, Window, With, default},
     render::render_resource::{Extent3d, TextureFormat},
     window::{
         CompositeAlphaMode, Monitor, RawHandleWrapper, WindowLevel, WindowMode, WindowPosition,
-        WindowResolution, WindowWrapper,
+        WindowRef, WindowResolution, WindowWrapper,
     },
 };
 use raw_window_handle::{
@@ -39,7 +40,7 @@ use processing_core::error::{self, ProcessingError, Result};
 #[cfg(not(target_os = "windows"))]
 use std::ptr::NonNull;
 
-use crate::image::Image;
+use crate::{graphics::SurfaceSize, image::Image};
 
 #[derive(Component, Debug, Clone)]
 pub struct Surface;
@@ -394,7 +395,11 @@ pub fn destroy(
 pub fn resize(
     In((window_entity, width, height)): In<(Entity, u32, u32)>,
     mut windows: Query<&mut Window>,
+    mut graphics_query: Query<(&RenderTarget, &mut SurfaceSize)>,
 ) -> Result<()> {
+    let width = width.max(1);
+    let height = height.max(1);
+
     if let Ok(mut window) = windows.get_mut(window_entity) {
         let scale = window.resolution.scale_factor();
         let physical_w = (width as f32 * scale) as u32;
@@ -403,6 +408,15 @@ pub fn resize(
             .resolution
             .set_physical_resolution(physical_w, physical_h);
     }
+
+    // SurfaceSize changes on resize, if not handled will break APIs dependent on correct SurfaceSize
+    for (target, mut surface_size) in graphics_query.iter_mut() {
+        if let RenderTarget::Window(WindowRef::Entity(surface)) = *target
+            && surface == window_entity
+        {
+            *surface_size = SurfaceSize(width, height);
+        }
+    }
     Ok(())
 }
 
@@ -448,6 +462,20 @@ pub fn physical_height(In(entity): In<Entity>, query: Query<&Window>) -> u32 {
         .unwrap_or(0)
 }
 
+pub fn width(In(entity): In<Entity>, query: Query<&Window>) -> u32 {
+    query
+        .get(entity)
+        .map(|w| w.resolution.width() as u32)
+        .unwrap_or(0)
+}
+
+pub fn height(In(entity): In<Entity>, query: Query<&Window>) -> u32 {
+    query
+        .get(entity)
+        .map(|w| w.resolution.height() as u32)
+        .unwrap_or(0)
+}
+
 pub fn set_title(
     In((entity, title)): In<(Entity, String)>,
     mut windows: Query<&mut Window>,