refactor project structure (start of redoing atomic branch without atomics)

core/src/render/texture.rs

@@ -0,0 +1,129 @@
+use image::{DynamicImage, EncodableLayout};
+use wgpu::{util::DeviceExt, *};
+
+use crate::layout::{TextureUpdate, Textures};
+
+pub struct GpuTextures {
+    device: Device,
+    queue: Queue,
+    views: Vec<TextureView>,
+    view_count: usize,
+    samplers: Vec<Sampler>,
+    null_view: TextureView,
+    no_views: Vec<TextureView>,
+}
+
+impl GpuTextures {
+    pub fn update(&mut self, textures: &mut Textures) -> bool {
+        let mut changed = false;
+        for update in textures.updates() {
+            changed = true;
+            match update {
+                TextureUpdate::Push(image) => self.push(image),
+                TextureUpdate::Set(i, image) => self.set(i, image),
+                TextureUpdate::SetFree => self.view_count += 1,
+                TextureUpdate::Free(i) => self.free(i),
+                TextureUpdate::PushFree => self.push_free(),
+            }
+        }
+        changed
+    }
+    fn set(&mut self, i: u32, image: &DynamicImage) {
+        self.view_count += 1;
+        let view = self.create_view(image);
+        self.views[i as usize] = view;
+    }
+    fn free(&mut self, i: u32) {
+        self.view_count -= 1;
+        self.views[i as usize] = self.null_view.clone();
+    }
+    fn push(&mut self, image: &DynamicImage) {
+        self.view_count += 1;
+        let view = self.create_view(image);
+        self.views.push(view);
+    }
+    fn push_free(&mut self) {
+        self.view_count += 1;
+        self.views.push(self.null_view.clone());
+    }
+
+    fn create_view(&self, image: &DynamicImage) -> TextureView {
+        let image = image.to_rgba8();
+        let (width, height) = image.dimensions();
+        let texture = self.device.create_texture_with_data(
+            &self.queue,
+            &TextureDescriptor {
+                label: None,
+                size: Extent3d {
+                    width,
+                    height,
+                    depth_or_array_layers: 1,
+                },
+                mip_level_count: 1,
+                sample_count: 1,
+                dimension: TextureDimension::D2,
+                format: TextureFormat::Rgba8Unorm,
+                usage: TextureUsages::TEXTURE_BINDING,
+                view_formats: &[],
+            },
+            wgt::TextureDataOrder::MipMajor,
+            image.as_bytes(),
+        );
+        texture.create_view(&TextureViewDescriptor::default())
+    }
+
+    pub fn new(device: &Device, queue: &Queue) -> Self {
+        let null_view = null_texture_view(device);
+        Self {
+            device: device.clone(),
+            queue: queue.clone(),
+            views: Vec::new(),
+            samplers: vec![default_sampler(device)],
+            no_views: vec![null_view.clone()],
+            null_view,
+            view_count: 0,
+        }
+    }
+
+    pub fn views(&self) -> Vec<&TextureView> {
+        if self.views.is_empty() {
+            &self.no_views
+        } else {
+            &self.views
+        }
+        .iter()
+        .by_ref()
+        .collect()
+    }
+
+    pub fn samplers(&self) -> Vec<&Sampler> {
+        self.samplers.iter().by_ref().collect()
+    }
+
+    pub fn view_count(&self) -> usize {
+        self.view_count
+    }
+}
+
+pub fn null_texture_view(device: &Device) -> TextureView {
+    device
+        .create_texture(&TextureDescriptor {
+            label: Some("null"),
+            size: Extent3d {
+                width: 1,
+                height: 1,
+                depth_or_array_layers: 1,
+            },
+            mip_level_count: 1,
+            sample_count: 1,
+            dimension: TextureDimension::D2,
+            format: TextureFormat::Rgba8Unorm,
+            usage: TextureUsages::TEXTURE_BINDING,
+            view_formats: &[],
+        })
+        .create_view(&TextureViewDescriptor::default())
+}
+
+pub fn default_sampler(device: &Device) -> Sampler {
+    device.create_sampler(&SamplerDescriptor::default())
+}