Add color option to visual bell

This adds the option to specify the color of the visual bell using the
`visual_bell.color` configuration setting.

This is done by rendering a big quad over the entire screen, which also
opens up options to draw other arbitrary rectangles on the screen in the
future.

1 files changed, 22 insertions, 0 deletions

diff --git a/res/rect.f.glsl b/res/rect.f.glsl
new file mode 100644
index 00000000..907ee858
--- /dev/null
+++ b/res/rect.f.glsl
@@ -0,0 +1,22 @@
+// Copyright 2016 Joe Wilm, The Alacritty Project Contributors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+#version 330 core
+in vec4 color;
+
+out vec4 FragColor;
+
+void main()
+{
+    FragColor = color;
+}