Disable depth and stencil buffers

This patch reduces the active GPU memory consumption by disabling the
depth and stencil buffers. During original testing it reduced GPU memory
usage on Linux by almost a third.

This is a reintroduction of previously reverted patch 3475e44.

Closes #2881.

CHANGELOG.md

@@ -30,6 +30,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 - Blurry fonts when changing padding size at runtime
 - Crash while typing on Wayland
 - Multi-line semantic bracket selection
+- Reduced GPU memory usage
 
 ## 0.11.0
 

alacritty/src/renderer/platform.rs

@@ -42,7 +42,10 @@ pub fn pick_gl_config(
     gl_display: &Display,
     raw_window_handle: Option<RawWindowHandle>,
 ) -> Result<Config, String> {
-    let mut default_config = ConfigTemplateBuilder::new().with_transparency(true);
+    let mut default_config = ConfigTemplateBuilder::new()
+        .with_depth_size(0)
+        .with_stencil_size(0)
+        .with_transparency(true);
 
     if let Some(raw_window_handle) = raw_window_handle {
         default_config = default_config.compatible_with_native_window(raw_window_handle);