Big performance improvement

1 files changed, 13 insertions, 2 deletions

diff --git a/src/config.rs b/src/config.rs
index 7eedb21..9376049 100644
--- a/src/config.rs
+++ b/src/config.rs
@@ -101,6 +101,14 @@ impl<'a> RenderWindowConfig<'a> {
 		}
 	}
 
+	fn alpha_mode(supported_modes: &[wgpu::CompositeAlphaMode]) -> wgpu::CompositeAlphaMode {
+		if supported_modes.contains(&wgpu::CompositeAlphaMode::PostMultiplied) {
+			wgpu::CompositeAlphaMode::PostMultiplied
+		} else {
+			wgpu::CompositeAlphaMode::Auto
+		}
+	}
+
 	/// Create a `WindowBuilder` from the configuration given. This window is
 	/// initially invisible and must later be made visible.
 	pub(crate) fn to_window(&self) -> WindowBuilder {
@@ -154,10 +162,12 @@ impl<'a> RenderWindowConfig<'a> {
 	/// Gets a surface configuration out of the config.
 	pub(crate) fn to_surface_configuration(
 		&self,
-		supported_modes: &[wgpu::PresentMode],
+		supported_present_modes: &[wgpu::PresentMode],
+		supported_alpha_modes: &[wgpu::CompositeAlphaMode],
 		texture_format: wgpu::TextureFormat,
 	) -> wgpu::SurfaceConfiguration {
-		let present_mode = Self::present_mode(self.vsync, supported_modes);
+		let present_mode = Self::present_mode(self.vsync, supported_present_modes);
+		let alpha_mode = Self::alpha_mode(supported_alpha_modes);
 
 		// configuration for the surface
 		wgpu::SurfaceConfiguration {
@@ -165,6 +175,7 @@ impl<'a> RenderWindowConfig<'a> {
 			format: texture_format,
 			width: self.default_width.get(),
 			height: self.default_height.get(),
+			alpha_mode,
 			present_mode,
 		}
 	}