codify "platform" into resolution logic, server-fn/fullstack overhaul (#4596)

overhaul dioxus fullstack using a new implementation of server_fn

This PR is a complete rewrite of dioxus fullstack designed to improve compatibility with axum and to fix a number of compilation errors based on feature flag unification plumbing through macros.

examples/10-integrations/bevy/src/bevy_renderer.rs

@@ -0,0 +1,163 @@
+use crate::bevy_scene_plugin::BevyScenePlugin;
+use bevy::{
+    prelude::*,
+    render::{
+        camera::{ManualTextureView, ManualTextureViewHandle, ManualTextureViews, RenderTarget},
+        render_resource::TextureFormat,
+        renderer::{
+            RenderAdapter, RenderAdapterInfo, RenderDevice, RenderInstance, RenderQueue,
+            WgpuWrapper,
+        },
+        settings::{RenderCreation, RenderResources},
+        RenderPlugin,
+    },
+};
+use dioxus_native::{CustomPaintCtx, DeviceHandle, TextureHandle};
+use std::sync::Arc;
+use wgpu::Instance;
+
+#[derive(Resource, Default)]
+pub struct UIData {
+    pub color: [f32; 3],
+}
+
+pub struct BevyRenderer {
+    app: App,
+    wgpu_device: wgpu::Device,
+    last_texture_size: (u32, u32),
+    texture_handle: Option<TextureHandle>,
+    manual_texture_view_handle: Option<ManualTextureViewHandle>,
+}
+
+impl BevyRenderer {
+    pub fn new(instance: &Instance, device_handle: &DeviceHandle) -> Self {
+        // Create a headless Bevy App.
+        let mut app = App::new();
+        app.add_plugins(
+            DefaultPlugins
+                .set(RenderPlugin {
+                    // Reuse the render resources from the Dioxus native renderer.
+                    render_creation: RenderCreation::Manual(RenderResources(
+                        RenderDevice::new(WgpuWrapper::new(device_handle.device.clone())),
+                        RenderQueue(Arc::new(WgpuWrapper::new(device_handle.queue.clone()))),
+                        RenderAdapterInfo(WgpuWrapper::new(device_handle.adapter.get_info())),
+                        RenderAdapter(Arc::new(WgpuWrapper::new(device_handle.adapter.clone()))),
+                        RenderInstance(Arc::new(WgpuWrapper::new(instance.clone()))),
+                    )),
+                    synchronous_pipeline_compilation: true,
+                    ..default()
+                })
+                .set(WindowPlugin {
+                    primary_window: None,
+                    exit_condition: bevy::window::ExitCondition::DontExit,
+                    close_when_requested: false,
+                })
+                .disable::<bevy::winit::WinitPlugin>(),
+        );
+
+        // Setup the rendering to texture.
+        app.insert_resource(ManualTextureViews::default());
+
+        // Add data from the UI.
+        app.insert_resource(UIData::default());
+
+        // Add the Bevy scene.
+        app.add_plugins(BevyScenePlugin {});
+
+        // Initialize the app to set up the render world properly.
+        app.finish();
+        app.cleanup();
+
+        Self {
+            app,
+            wgpu_device: device_handle.device.clone(),
+            last_texture_size: (0, 0),
+            texture_handle: None,
+            manual_texture_view_handle: None,
+        }
+    }
+
+    pub fn render(
+        &mut self,
+        ctx: CustomPaintCtx<'_>,
+        color: [f32; 3],
+        width: u32,
+        height: u32,
+        _start_time: &std::time::Instant,
+    ) -> Option<TextureHandle> {
+        // Update the UI data.
+        if let Some(mut ui) = self.app.world_mut().get_resource_mut::<UIData>() {
+            ui.color = color;
+        }
+
+        // Init self.texture_handle if None or if width/height changed.
+        self.init_texture(ctx, width, height);
+        // Run one frame of the Bevy app to render the 3D scene.
+        self.app.update();
+
+        self.texture_handle
+    }
+
+    fn init_texture(&mut self, mut ctx: CustomPaintCtx<'_>, width: u32, height: u32) {
+        // Reuse self.texture_handle if already initialized to the correct size.
+        let current_size = (width, height);
+        if self.texture_handle.is_some() && self.last_texture_size == current_size {
+            return;
+        }
+
+        let world = self.app.world_mut();
+
+        // Skip if no camera.
+        if world.query::<&Camera>().single(world).is_err() {
+            return;
+        }
+
+        if let Some(mut manual_texture_views) = world.get_resource_mut::<ManualTextureViews>() {
+            // Clean previous texture if any.
+            if let Some(texture_handle) = self.texture_handle {
+                ctx.unregister_texture(texture_handle);
+                self.texture_handle = None;
+            }
+            if let Some(old_handle) = self.manual_texture_view_handle {
+                manual_texture_views.remove(&old_handle);
+                self.manual_texture_view_handle = None;
+            }
+
+            // Create the texture for the camera target and the CustomPaintCtx.
+            let format = TextureFormat::Rgba8UnormSrgb;
+            let wgpu_texture = self.wgpu_device.create_texture(&wgpu::TextureDescriptor {
+                label: None,
+                size: wgpu::Extent3d {
+                    width,
+                    height,
+                    depth_or_array_layers: 1,
+                },
+                mip_level_count: 1,
+                sample_count: 1,
+                dimension: wgpu::TextureDimension::D2,
+                format,
+                usage: wgpu::TextureUsages::TEXTURE_BINDING
+                    | wgpu::TextureUsages::RENDER_ATTACHMENT
+                    | wgpu::TextureUsages::COPY_SRC,
+                view_formats: &[],
+            });
+            let wgpu_texture_view =
+                wgpu_texture.create_view(&wgpu::TextureViewDescriptor::default());
+            let manual_texture_view = ManualTextureView {
+                texture_view: wgpu_texture_view.into(),
+                size: bevy::math::UVec2::new(width, height),
+                format,
+            };
+            let manual_texture_view_handle = ManualTextureViewHandle(0);
+            manual_texture_views.insert(manual_texture_view_handle, manual_texture_view);
+
+            if let Ok(mut camera) = world.query::<&mut Camera>().single_mut(world) {
+                camera.target = RenderTarget::TextureView(manual_texture_view_handle);
+
+                self.last_texture_size = current_size;
+                self.manual_texture_view_handle = Some(manual_texture_view_handle);
+                self.texture_handle = Some(ctx.register_texture(wgpu_texture));
+            }
+        }
+    }
+}