Add Drop implementations for OpenGL structures

alacritty/src/renderer/mod.rs

@@ -754,6 +754,16 @@ impl QuadRenderer {
     }
 }
 
+impl Drop for QuadRenderer {
+    fn drop(&mut self) {
+        unsafe {
+            gl::DeleteBuffers(1, &self.vbo_instance);
+            gl::DeleteBuffers(1, &self.ebo);
+            gl::DeleteVertexArrays(1, &self.vao);
+        }
+    }
+}
+
 impl<'a> RenderApi<'a> {
     pub fn clear(&self, color: Rgb) {
         unsafe {
@@ -1402,3 +1412,11 @@ impl Atlas {
         Ok(())
     }
 }
+
+impl Drop for Atlas {
+    fn drop(&mut self) {
+        unsafe {
+            gl::DeleteTextures(1, &self.id);
+        }
+    }
+}

alacritty/src/renderer/rects.rs

@@ -344,6 +344,15 @@ impl RectRenderer {
     }
 }
 
+impl Drop for RectRenderer {
+    fn drop(&mut self) {
+        unsafe {
+            gl::DeleteBuffers(1, &self.vbo);
+            gl::DeleteVertexArrays(1, &self.vao);
+        }
+    }
+}
+
 /// Rectangle drawing program.
 #[derive(Debug)]
 pub struct RectShaderProgram {