Set renderer multisample and depth-stencil state

examples/hello-world.rs

@@ -4,9 +4,9 @@ use glyphon::{
 };
 use wgpu::{
     Backends, CommandEncoderDescriptor, CompositeAlphaMode, DeviceDescriptor, Features, Instance,
-    Limits, LoadOp, Operations, PresentMode, RenderPassColorAttachment, RenderPassDescriptor,
-    RequestAdapterOptions, SurfaceConfiguration, TextureFormat, TextureUsages,
-    TextureViewDescriptor,
+    Limits, LoadOp, MultisampleState, Operations, PresentMode, RenderPassColorAttachment,
+    RenderPassDescriptor, RequestAdapterOptions, SurfaceConfiguration, TextureFormat,
+    TextureUsages, TextureViewDescriptor,
 };
 use winit::{
     dpi::LogicalSize,
@@ -64,12 +64,13 @@ async fn run() {
     surface.configure(&device, &config);
 
     // Set up text renderer
-    let mut text_renderer = TextRenderer::new(&device, &queue);
     unsafe {
         FONT_SYSTEM = Some(FontSystem::new());
     }
     let mut cache = SwashCache::new(unsafe { FONT_SYSTEM.as_ref().unwrap() });
     let mut atlas = TextAtlas::new(&device, &queue, swapchain_format);
+    let mut text_renderer =
+        TextRenderer::new(&mut atlas, &device, MultisampleState::default(), None);
     let mut buffer = Buffer::new(
         unsafe { FONT_SYSTEM.as_ref().unwrap() },
         Metrics::new(30, 42),

src/text_atlas.rs

@@ -5,11 +5,12 @@ use std::{borrow::Cow, mem::size_of, num::NonZeroU64, sync::Arc};
 use wgpu::{
     BindGroup, BindGroupDescriptor, BindGroupEntry, BindGroupLayoutEntry, BindingResource,
     BindingType, BlendState, Buffer, BufferBindingType, BufferDescriptor, BufferUsages,
-    ColorTargetState, ColorWrites, Device, Extent3d, FilterMode, FragmentState, MultisampleState,
-    PipelineLayoutDescriptor, PrimitiveState, Queue, RenderPipeline, RenderPipelineDescriptor,
-    SamplerBindingType, SamplerDescriptor, ShaderModuleDescriptor, ShaderSource, ShaderStages,
-    Texture, TextureDescriptor, TextureDimension, TextureFormat, TextureSampleType, TextureUsages,
-    TextureView, TextureViewDescriptor, TextureViewDimension, VertexFormat, VertexState,
+    ColorTargetState, ColorWrites, DepthStencilState, Device, Extent3d, FilterMode, FragmentState,
+    MultisampleState, PipelineLayout, PipelineLayoutDescriptor, PrimitiveState, Queue,
+    RenderPipeline, RenderPipelineDescriptor, SamplerBindingType, SamplerDescriptor, ShaderModule,
+    ShaderModuleDescriptor, ShaderSource, ShaderStages, Texture, TextureDescriptor,
+    TextureDimension, TextureFormat, TextureSampleType, TextureUsages, TextureView,
+    TextureViewDescriptor, TextureViewDimension, VertexFormat, VertexState,
 };
 
 pub(crate) struct InnerAtlas {
@@ -88,10 +89,18 @@ impl InnerAtlas {
 pub struct TextAtlas {
     pub(crate) params: Params,
     pub(crate) params_buffer: Buffer,
-    pub(crate) pipeline: Arc<RenderPipeline>,
+    pub(crate) cached_pipelines: Vec<(
+        MultisampleState,
+        Option<DepthStencilState>,
+        Arc<RenderPipeline>,
+    )>,
     pub(crate) bind_group: Arc<BindGroup>,
     pub(crate) color_atlas: InnerAtlas,
     pub(crate) mask_atlas: InnerAtlas,
+    pub(crate) pipeline_layout: PipelineLayout,
+    pub(crate) shader: ShaderModule,
+    pub(crate) vertex_buffers: [wgpu::VertexBufferLayout<'static>; 1],
+    pub(crate) format: TextureFormat,
 }
 
 impl TextAtlas {
@@ -234,40 +243,17 @@ impl TextAtlas {
             push_constant_ranges: &[],
         });
 
-        let pipeline = Arc::new(device.create_render_pipeline(&RenderPipelineDescriptor {
-            label: Some("glyphon pipeline"),
-            layout: Some(&pipeline_layout),
-            vertex: VertexState {
-                module: &shader,
-                entry_point: "vs_main",
-                buffers: &vertex_buffers,
-            },
-            fragment: Some(FragmentState {
-                module: &shader,
-                entry_point: "fs_main",
-                targets: &[Some(ColorTargetState {
-                    format,
-                    blend: Some(BlendState::ALPHA_BLENDING),
-                    write_mask: ColorWrites::default(),
-                })],
-            }),
-            primitive: PrimitiveState::default(),
-            depth_stencil: None,
-            multisample: MultisampleState {
-                count: 1,
-                mask: !0,
-                alpha_to_coverage_enabled: false,
-            },
-            multiview: None,
-        }));
-
         Self {
             params,
             params_buffer,
-            pipeline,
+            cached_pipelines: Vec::new(),
             bind_group,
             color_atlas,
             mask_atlas,
+            pipeline_layout,
+            shader,
+            vertex_buffers,
+            format,
         }
     }
 
@@ -295,4 +281,44 @@ impl TextAtlas {
             ContentType::Mask => &mut self.mask_atlas,
         }
     }
+
+    pub(crate) fn get_or_create_pipeline(
+        &mut self,
+        device: &Device,
+        multisample: MultisampleState,
+        depth_stencil: Option<DepthStencilState>,
+    ) -> Arc<RenderPipeline> {
+        self.cached_pipelines
+            .iter()
+            .find(|(ms, ds, _)| ms == &multisample && ds == &depth_stencil)
+            .map(|(_, _, p)| Arc::clone(p))
+            .unwrap_or_else(|| {
+                let pipeline = Arc::new(device.create_render_pipeline(&RenderPipelineDescriptor {
+                    label: Some("glyphon pipeline"),
+                    layout: Some(&self.pipeline_layout),
+                    vertex: VertexState {
+                        module: &self.shader,
+                        entry_point: "vs_main",
+                        buffers: &self.vertex_buffers,
+                    },
+                    fragment: Some(FragmentState {
+                        module: &self.shader,
+                        entry_point: "fs_main",
+                        targets: &[Some(ColorTargetState {
+                            format: self.format,
+                            blend: Some(BlendState::ALPHA_BLENDING),
+                            write_mask: ColorWrites::default(),
+                        })],
+                    }),
+                    primitive: PrimitiveState::default(),
+                    depth_stencil: depth_stencil.clone(),
+                    multisample,
+                    multiview: None,
+                }));
+
+                self.cached_pipelines
+                    .push((multisample, depth_stencil, pipeline.clone()));
+                pipeline
+            })
+    }
 }

src/text_render.rs

@@ -2,10 +2,11 @@ use crate::{
     CacheKey, Color, GlyphDetails, GlyphToRender, GpuCacheStatus, Params, PrepareError,
     RenderError, Resolution, SwashCache, SwashContent, TextArea, TextAtlas,
 };
-use std::{collections::HashSet, iter, mem::size_of, num::NonZeroU32, slice};
+use std::{collections::HashSet, iter, mem::size_of, num::NonZeroU32, slice, sync::Arc};
 use wgpu::{
-    Buffer, BufferDescriptor, BufferUsages, Device, Extent3d, ImageCopyTexture, ImageDataLayout,
-    IndexFormat, Origin3d, Queue, RenderPass, TextureAspect, COPY_BUFFER_ALIGNMENT,
+    Buffer, BufferDescriptor, BufferUsages, DepthStencilState, Device, Extent3d, ImageCopyTexture,
+    ImageDataLayout, IndexFormat, MultisampleState, Origin3d, Queue, RenderPass, RenderPipeline,
+    TextureAspect, COPY_BUFFER_ALIGNMENT,
 };
 
 /// A text renderer that uses cached glyphs to render text into an existing render pass.
@@ -17,11 +18,17 @@ pub struct TextRenderer {
     vertices_to_render: u32,
     glyphs_in_use: HashSet<CacheKey>,
     screen_resolution: Resolution,
+    pipeline: Arc<RenderPipeline>,
 }
 
 impl TextRenderer {
     /// Creates a new `TextRenderer`.
-    pub fn new(device: &Device, _queue: &Queue) -> Self {
+    pub fn new(
+        atlas: &mut TextAtlas,
+        device: &Device,
+        multisample: MultisampleState,
+        depth_stencil: Option<DepthStencilState>,
+    ) -> Self {
         let vertex_buffer_size = next_copy_buffer_size(4096);
         let vertex_buffer = device.create_buffer(&BufferDescriptor {
             label: Some("glyphon vertices"),
@@ -38,6 +45,8 @@ impl TextRenderer {
             mapped_at_creation: false,
         });
 
+        let pipeline = atlas.get_or_create_pipeline(device, multisample, depth_stencil);
+
         Self {
             vertex_buffer,
             vertex_buffer_size,
@@ -49,6 +58,7 @@ impl TextRenderer {
                 width: 0,
                 height: 0,
             },
+            pipeline,
         }
     }
 
@@ -420,7 +430,7 @@ impl TextRenderer {
             }
         }
 
-        pass.set_pipeline(&atlas.pipeline);
+        pass.set_pipeline(&self.pipeline);
         pass.set_bind_group(0, &atlas.bind_group, &[]);
         pass.set_vertex_buffer(0, self.vertex_buffer.slice(..));
         pass.set_index_buffer(self.index_buffer.slice(..), IndexFormat::Uint32);