pass size on creation

src/lib.rs

@@ -124,7 +124,7 @@ impl OrbitalCamera {
 }
 
 impl Core {
-	pub fn new(gpu: Gpu) -> Self {
+	pub fn new(gpu: Gpu, pixel_size: UVec2) -> Self {
 		let Gpu {
 			device,
 			queue,
@@ -136,14 +136,16 @@ impl Core {
 		let tripod = new_tripod(&device);
 		queue.submit([]); // flush buffer updates
 
-		Self {
+		let mut this = Self {
 			device,
 			queue,
 			surface,
 			pipeline,
 			tripod,
 			mesh_pipe,
-		}
+		};
+		this.configure(pixel_size);
+		this
 	}
 
 	fn render(&self, output: &wgpu::Texture, args: &RedrawArgs) {

src/main.rs

@@ -26,8 +26,7 @@ impl MainWindow {
 			instance.create_surface(Arc::clone(&window))
 		}))
 		.unwrap();
-		let mut core = Core::new(gpu);
-		core.configure(uvec2(1, 1));
+		let core = Core::new(gpu, uvec2(1, 1));
 		Self { window, core }
 	}
 

ui/src/api.cxx

@@ -4,7 +4,7 @@
 #include <utility>
 
 namespace ffi {
-extern "C" Core* rt4_viewport_create(xcb_connection_t* connection, std::uint32_t window);
+extern "C" Core* rt4_viewport_create(xcb_connection_t* connection, std::uint32_t window, std::uint32_t width, std::uint32_t height);
 extern "C" void rt4_viewport_destroy(Core* viewport);
 extern "C" void rt4_viewport_configure(Core* viewport, std::uint32_t width, std::uint32_t height);
 extern "C" void rt4_viewport_redraw(Core* viewport, const RedrawArgs* args);
@@ -26,13 +26,13 @@ BoxCore& BoxCore::operator=(BoxCore&& b) {
 	return *this;
 }
 
-BoxCore BoxCore::from_xcb(xcb_connection_t* connection, std::uint32_t window) {
+BoxCore BoxCore::from_xcb(xcb_connection_t* connection, std::uint32_t window, std::uint32_t width, std::uint32_t height) {
 	if (!connection)
 		throw std::logic_error("attempt to use a null connection");
 	if (!window)
 		throw std::logic_error("attempt to use a null window");
 	BoxCore out;
-	out.ptr.ptr = ffi::rt4_viewport_create(connection, window);
+	out.ptr.ptr = ffi::rt4_viewport_create(connection, window, width, height);
 	return out;
 }
 

ui/src/api.hxx

@@ -69,7 +69,7 @@ public:
 
 	void reset();
 
-	static BoxCore from_xcb(xcb_connection_t* connection, std::uint32_t window);
+	static BoxCore from_xcb(xcb_connection_t* connection, std::uint32_t window, std::uint32_t width, std::uint32_t height);
 
 private:
 	MutCore ptr;

ui/src/lib.rs

@@ -1,12 +1,13 @@
 use std::{ffi::c_void, num::NonZero, ptr::NonNull};
 
-use glam::uvec2;
+use glam::{UVec2, uvec2};
 use photon_light::{Core, RedrawArgs, init_gpu_inner};
 use raw_window_handle::{RawDisplayHandle, RawWindowHandle, XcbDisplayHandle, XcbWindowHandle};
 
 unsafe fn create_viewport(
 	display: impl Into<RawDisplayHandle>,
 	window: impl Into<RawWindowHandle>,
+	size: UVec2,
 ) -> Box<Core> {
 	let target = wgpu::SurfaceTargetUnsafe::RawHandle {
 		raw_display_handle: display.into(),
@@ -16,17 +17,19 @@ unsafe fn create_viewport(
 		instance.create_surface_unsafe(target)
 	}))
 	.unwrap();
-	Box::new(Core::new(gpu))
+	Box::new(Core::new(gpu, size))
 }
 
 #[unsafe(no_mangle)]
 unsafe extern "C" fn rt4_viewport_create(
 	connection: NonNull<c_void>,
 	window: NonZero<u32>,
+	width: u32,
+	height: u32,
 ) -> Box<Core> {
 	let display = XcbDisplayHandle::new(Some(connection), 0);
 	let window = XcbWindowHandle::new(window);
-	unsafe { create_viewport(display, window) }
+	unsafe { create_viewport(display, window, uvec2(width, height)) }
 }
 
 #[unsafe(no_mangle)]

ui/src/viewport.cxx

@@ -61,9 +61,9 @@ void Viewport::recreate() try {
 
 	fprintf(stderr, "connection %p, window %#08x\n", xcb_connection, x11_window);
 
+	const QSize device_size = size() * devicePixelRatio();
 	core.reset();
-	core = BoxCore::from_xcb(xcb_connection, x11_window);
-	updateSize();
+	core = BoxCore::from_xcb(xcb_connection, x11_window, device_size.width(), device_size.height());
 } catch (const std::exception& e) {
 	fprintf(stderr, "failed to recreate the viewport: %s", e.what());
 }