Small improvements to cache (#130)

* Remove `Arc` around `RenderPipeline`

It is not necessary anymore in last `wgpu` version.

* Replace `RwLock` with `Mutex`

It was only used for writing.

src/cache.rs

@@ -4,7 +4,7 @@ use std::{
     mem,
     num::NonZeroU64,
     ops::Deref,
-    sync::{Arc, RwLock},
+    sync::{Arc, Mutex},
 };
 use wgpu::{
     BindGroup, BindGroupDescriptor, BindGroupEntry, BindGroupLayout, BindGroupLayoutEntry,
@@ -29,12 +29,12 @@ struct Inner {
     atlas_layout: BindGroupLayout,
     uniforms_layout: BindGroupLayout,
     pipeline_layout: PipelineLayout,
-    cache: RwLock<
+    cache: Mutex<
         Vec<(
             TextureFormat,
             MultisampleState,
             Option<DepthStencilState>,
-            Arc<RenderPipeline>,
+            RenderPipeline,
         )>,
     >,
 }
@@ -153,7 +153,7 @@ impl Cache {
             uniforms_layout,
             atlas_layout,
             pipeline_layout,
-            cache: RwLock::new(Vec::new()),
+            cache: Mutex::new(Vec::new()),
         }))
     }
 
@@ -200,7 +200,7 @@ impl Cache {
         format: TextureFormat,
         multisample: MultisampleState,
         depth_stencil: Option<DepthStencilState>,
-    ) -> Arc<RenderPipeline> {
+    ) -> RenderPipeline {
         let Inner {
             cache,
             pipeline_layout,
@@ -209,14 +209,14 @@ impl Cache {
             ..
         } = self.0.deref();
 
-        let mut cache = cache.write().expect("Write pipeline cache");
+        let mut cache = cache.lock().expect("Write pipeline cache");
 
         cache
             .iter()
             .find(|(fmt, ms, ds, _)| fmt == &format && ms == &multisample && ds == &depth_stencil)
-            .map(|(_, _, _, p)| Arc::clone(p))
+            .map(|(_, _, _, p)| p.clone())
             .unwrap_or_else(|| {
-                let pipeline = Arc::new(device.create_render_pipeline(&RenderPipelineDescriptor {
+                let pipeline = device.create_render_pipeline(&RenderPipelineDescriptor {
                     label: Some("glyphon pipeline"),
                     layout: Some(pipeline_layout),
                     vertex: VertexState {
@@ -243,7 +243,7 @@ impl Cache {
                     multisample,
                     multiview: None,
                     cache: None,
-                }));
+                });
 
                 cache.push((format, multisample, depth_stencil, pipeline.clone()));
 

src/text_atlas.rs

@@ -1,15 +1,16 @@
 use crate::{
-    text_render::GlyphonCacheKey, Cache, ContentType, RasterizeCustomGlyphRequest, FontSystem,
-    GlyphDetails, GpuCacheStatus, RasterizedCustomGlyph, SwashCache,
+    text_render::GlyphonCacheKey, Cache, ContentType, FontSystem, GlyphDetails, GpuCacheStatus,
+    RasterizeCustomGlyphRequest, RasterizedCustomGlyph, SwashCache,
 };
 use etagere::{size2, Allocation, BucketedAtlasAllocator};
 use lru::LruCache;
 use rustc_hash::FxHasher;
-use std::{collections::HashSet, hash::BuildHasherDefault, sync::Arc};
+use std::{collections::HashSet, hash::BuildHasherDefault};
 use wgpu::{
-    BindGroup, DepthStencilState, Device, Extent3d, TexelCopyTextureInfo, TexelCopyBufferLayout,
-    MultisampleState, Origin3d, Queue, RenderPipeline, Texture, TextureAspect, TextureDescriptor,
-    TextureDimension, TextureFormat, TextureUsages, TextureView, TextureViewDescriptor,
+    BindGroup, DepthStencilState, Device, Extent3d, MultisampleState, Origin3d, Queue,
+    RenderPipeline, TexelCopyBufferLayout, TexelCopyTextureInfo, Texture, TextureAspect,
+    TextureDescriptor, TextureDimension, TextureFormat, TextureUsages, TextureView,
+    TextureViewDescriptor,
 };
 
 type Hasher = BuildHasherDefault<FxHasher>;
@@ -344,9 +345,7 @@ impl TextAtlas {
         cache: &mut SwashCache,
         content_type: ContentType,
         scale_factor: f32,
-        rasterize_custom_glyph: impl FnMut(
-            RasterizeCustomGlyphRequest,
-        ) -> Option<RasterizedCustomGlyph>,
+        rasterize_custom_glyph: impl FnMut(RasterizeCustomGlyphRequest) -> Option<RasterizedCustomGlyph>,
     ) -> bool {
         let did_grow = match content_type {
             ContentType::Mask => self.mask_atlas.grow(
@@ -386,7 +385,7 @@ impl TextAtlas {
         device: &Device,
         multisample: MultisampleState,
         depth_stencil: Option<DepthStencilState>,
-    ) -> Arc<RenderPipeline> {
+    ) -> RenderPipeline {
         self.cache
             .get_or_create_pipeline(device, self.format, multisample, depth_stencil)
     }

src/text_render.rs

@@ -4,18 +4,18 @@ use crate::{
     RasterizedCustomGlyph, RenderError, SwashCache, SwashContent, TextArea, TextAtlas, Viewport,
 };
 use cosmic_text::{Color, SubpixelBin};
-use std::{slice, sync::Arc};
+use std::slice;
 use wgpu::{
-    Buffer, BufferDescriptor, BufferUsages, DepthStencilState, Device, Extent3d, TexelCopyTextureInfo,
-    TexelCopyBufferLayout, MultisampleState, Origin3d, Queue, RenderPass, RenderPipeline, TextureAspect,
-    COPY_BUFFER_ALIGNMENT,
+    Buffer, BufferDescriptor, BufferUsages, DepthStencilState, Device, Extent3d, MultisampleState,
+    Origin3d, Queue, RenderPass, RenderPipeline, TexelCopyBufferLayout, TexelCopyTextureInfo,
+    TextureAspect, COPY_BUFFER_ALIGNMENT,
 };
 
 /// A text renderer that uses cached glyphs to render text into an existing render pass.
 pub struct TextRenderer {
     vertex_buffer: Buffer,
     vertex_buffer_size: u64,
-    pipeline: Arc<RenderPipeline>,
+    pipeline: RenderPipeline,
     glyph_vertices: Vec<GlyphToRender>,
 }