Introduce `ICED_PRESENT_MODE` env var to pick a `wgpu::PresentMode`

2 files changed, 29 insertions, 10 deletions

diff --git a/wgpu/src/settings.rs b/wgpu/src/settings.rs
index a6aea0a5..5e2603ee 100644
--- a/wgpu/src/settings.rs
+++ b/wgpu/src/settings.rs
@@ -51,3 +51,17 @@ impl From<graphics::Settings> for Settings {
         }
     }
 }
+
+pub fn present_mode_from_env() -> Option<wgpu::PresentMode> {
+    let present_mode = std::env::var("ICED_PRESENT_MODE").ok()?;
+
+    match present_mode.to_lowercase().as_str() {
+        "vsync" => Some(wgpu::PresentMode::AutoVsync),
+        "no_vsync" => Some(wgpu::PresentMode::AutoNoVsync),
+        "immediate" => Some(wgpu::PresentMode::Immediate),
+        "fifo" => Some(wgpu::PresentMode::Fifo),
+        "fifo_relaxed" => Some(wgpu::PresentMode::FifoRelaxed),
+        "mailbox" => Some(wgpu::PresentMode::Mailbox),
+        _ => None,
+    }
+}
diff --git a/wgpu/src/window/compositor.rs b/wgpu/src/window/compositor.rs
index baf9f315..2e938c77 100644
--- a/wgpu/src/window/compositor.rs
+++ b/wgpu/src/window/compositor.rs
@@ -4,7 +4,8 @@ use crate::graphics::color;
 use crate::graphics::compositor;
 use crate::graphics::error;
 use crate::graphics::{self, Viewport};
-use crate::{Engine, Renderer, Settings};
+use crate::settings::{self, Settings};
+use crate::{Engine, Renderer};
 
 /// A window graphics backend for iced powered by `wgpu`.
 #[allow(missing_debug_implementations)]
@@ -270,15 +271,19 @@ impl graphics::Compositor for Compositor {
         backend: Option<&str>,
     ) -> Result<Self, graphics::Error> {
         match backend {
-            None | Some("wgpu") => Ok(new(
-                Settings {
-                    backends: wgpu::util::backend_bits_from_env()
-                        .unwrap_or(wgpu::Backends::all()),
-                    ..settings.into()
-                },
-                compatible_window,
-            )
-            .await?),
+            None | Some("wgpu") => {
+                let mut settings = Settings::from(settings);
+
+                if let Some(backends) = wgpu::util::backend_bits_from_env() {
+                    settings.backends = backends;
+                }
+
+                if let Some(present_mode) = settings::present_mode_from_env() {
+                    settings.present_mode = present_mode;
+                }
+
+                Ok(new(settings, compatible_window).await?)
+            }
             Some(backend) => Err(graphics::Error::GraphicsAdapterNotFound {
                 backend: "wgpu",
                 reason: error::Reason::DidNotMatch {