render: Set texture filter to linear

src/backend/render/mod.rs

@@ -14,7 +14,7 @@ use smithay::{
         renderer::{
             gles2::{Gles2Renderbuffer, Gles2Renderer, Gles2Texture},
             multigpu::{egl::EglGlesBackend, Error as MultiError, MultiFrame, MultiRenderer},
-            ImportAll, Renderer,
+            ImportAll, Renderer, TextureFilter,
         },
     },
     desktop::space::{RenderElement, RenderError, SpaceOutputTuple, SurfaceTree},
@@ -110,6 +110,8 @@ where
     <R as Renderer>::TextureId: Clone + 'static,
     CustomElem: RenderElement<R>,
 {
+    renderer.downscale_filter(TextureFilter::Linear).map_err(RenderError::Rendering)?;
+
     #[cfg(feature = "debug")]
     {
         fps.start();