Experimental wgpu WebGL backend support

- Added missing `draw_cache_align_4x4` call for `brush_glyph` on wasm32 target
- Added WebGL support to `integratio_wgpu` example
- Fixed test.yml CI workflow
- Removed spir-v shader in `integration_wgpu`; Fixed formatting
- Removed redundant `BoxStream` typedef

2 files changed, 8 insertions, 3 deletions

diff --git a/wgpu/Cargo.toml b/wgpu/Cargo.toml
index f4c4fa2c..46012ea7 100644
--- a/wgpu/Cargo.toml
+++ b/wgpu/Cargo.toml
@@ -25,6 +25,7 @@ canvas = ["iced_graphics/canvas"]
 qr_code = ["iced_graphics/qr_code"]
 default_system_font = ["iced_graphics/font-source"]
 spirv = ["wgpu/spirv"]
+webgl = ["wgpu/webgl"]
 
 [dependencies]
 wgpu = "0.12"
diff --git a/wgpu/src/text.rs b/wgpu/src/text.rs
index 336696ee..45f1f2de 100644
--- a/wgpu/src/text.rs
+++ b/wgpu/src/text.rs
@@ -48,11 +48,15 @@ impl Pipeline {
                     .expect("Load fallback font")
             });
 
-        let draw_brush =
+        let draw_brush_builder =
             wgpu_glyph::GlyphBrushBuilder::using_font(font.clone())
                 .initial_cache_size((2048, 2048))
-                .draw_cache_multithread(multithreading)
-                .build(device, format);
+                .draw_cache_multithread(multithreading);
+
+        #[cfg(target_arch = "wasm32")]
+        let draw_brush_builder = draw_brush_builder.draw_cache_align_4x4(true);
+
+        let draw_brush = draw_brush_builder.build(device, format);
 
         let measure_brush =
             glyph_brush::GlyphBrushBuilder::using_font(font).build();