Reuse last set pipeline for triangle in iced_wgpu

wgpu/src/triangle.rs

@@ -186,6 +186,7 @@ impl Pipeline {
 
             let mut num_solids = 0;
             let mut num_gradients = 0;
+            let mut last_is_solid = None;
 
             for (index, mesh) in meshes.iter().enumerate() {
                 let clip_bounds = (mesh.clip_bounds * scale_factor).snap();
@@ -199,17 +200,35 @@ impl Pipeline {
 
                 match mesh.style {
                     mesh::Style::Solid(_) => {
+                        if !last_is_solid.unwrap_or(false) {
+                            self.pipelines
+                                .solid
+                                .set_render_pass_pipeline(&mut render_pass);
+
+                            last_is_solid = Some(true);
+                        }
+
                         self.pipelines.solid.configure_render_pass(
                             &mut render_pass,
                             num_solids,
                         );
+
                         num_solids += 1;
                     }
                     mesh::Style::Gradient(_) => {
+                        if last_is_solid.unwrap_or(true) {
+                            self.pipelines
+                                .gradient
+                                .set_render_pass_pipeline(&mut render_pass);
+
+                            last_is_solid = Some(false);
+                        }
+
                         self.pipelines.gradient.configure_render_pass(
                             &mut render_pass,
                             num_gradients,
                         );
+
                         num_gradients += 1;
                     }
                 };

wgpu/src/triangle/gradient.rs

@@ -245,6 +245,13 @@ impl Pipeline {
         self.color_stops_pending_write.color_stops.clear();
     }
 
+    pub fn set_render_pass_pipeline<'a>(
+        &'a self,
+        render_pass: &mut wgpu::RenderPass<'a>,
+    ) {
+        render_pass.set_pipeline(&self.pipeline);
+    }
+
     /// Configures the current render pass to draw the gradient at its offset stored in the
     /// [DynamicBuffer] at [index].
     pub fn configure_render_pass<'a>(
@@ -252,7 +259,6 @@ impl Pipeline {
         render_pass: &mut wgpu::RenderPass<'a>,
         count: usize,
     ) {
-        render_pass.set_pipeline(&self.pipeline);
         render_pass.set_bind_group(
             0,
             &self.bind_group,

wgpu/src/triangle/solid.rs

@@ -147,6 +147,13 @@ impl Pipeline {
         self.buffer.write(device, staging_belt, encoder);
     }
 
+    pub fn set_render_pass_pipeline<'a>(
+        &'a self,
+        render_pass: &mut wgpu::RenderPass<'a>,
+    ) {
+        render_pass.set_pipeline(&self.pipeline);
+    }
+
     /// Configures the current render pass to draw the solid at its offset stored in the
     /// [DynamicBuffer] at [index].
     pub fn configure_render_pass<'a>(
@@ -154,7 +161,6 @@ impl Pipeline {
         render_pass: &mut wgpu::RenderPass<'a>,
         count: usize,
     ) {
-        render_pass.set_pipeline(&self.pipeline);
         render_pass.set_bind_group(
             0,
             &self.bind_group,