From 23ebfb707a52d03a7beceaa5e197b4491619ae1d Mon Sep 17 00:00:00 2001
From: Héctor Ramón Jiménez <hector0193@gmail.com>
Date: Tue, 29 Oct 2019 01:21:28 +0100
Subject: Issue draw calls only when necessary

---
 wgpu/src/renderer.rs | 38 +++++++++++++++++++++-----------------
 1 file changed, 21 insertions(+), 17 deletions(-)

(limited to 'wgpu/src/renderer.rs')

diff --git a/wgpu/src/renderer.rs b/wgpu/src/renderer.rs
index 0f91428e..bb7cb858 100644
--- a/wgpu/src/renderer.rs
+++ b/wgpu/src/renderer.rs
@@ -294,25 +294,29 @@ impl Renderer {
         let translated = transformation
             * Transformation::translate(0.0, -(layer.y_offset as f32));
 
-        self.quad_pipeline.draw(
-            &mut self.device,
-            encoder,
-            &layer.quads,
-            transformation,
-            layer.bounds,
-            target,
-        );
+        if layer.quads.len() > 0 {
+            self.quad_pipeline.draw(
+                &mut self.device,
+                encoder,
+                &layer.quads,
+                transformation,
+                layer.bounds,
+                target,
+            );
+        }
 
-        self.image_pipeline.draw(
-            &mut self.device,
-            encoder,
-            &layer.images,
-            translated,
-            layer.bounds,
-            target,
-        );
+        if layer.images.len() > 0 {
+            self.image_pipeline.draw(
+                &mut self.device,
+                encoder,
+                &layer.images,
+                translated,
+                layer.bounds,
+                target,
+            );
+        }
 
-        {
+        if layer.text.len() > 0 {
             let mut glyph_brush = self.glyph_brush.borrow_mut();
 
             for text in layer.text.iter() {
-- 
cgit