1 files changed, 9 insertions, 0 deletions
diff --git a/src/mbgl/shader/outline.fragment.glsl b/src/mbgl/shader/outline.fragment.glsl
new file mode 100644
index 0000000000..eccda714e5
--- /dev/null
+++ b/src/mbgl/shader/outline.fragment.glsl
@@ -0,0 +1,9 @@
+uniform vec4 u_color;
+
+varying vec2 v_pos;
+
+void main() {
+    float dist = length(v_pos - gl_FragCoord.xy);
+    float alpha = smoothstep(1.0, 0.0, dist);
+    gl_FragColor = u_color * alpha;
+}