1 files changed, 13 insertions, 0 deletions
diff --git a/src/mbgl/shader/sdf.fragment.glsl b/src/mbgl/shader/sdf.fragment.glsl
new file mode 100644
index 0000000000..d72d61dab1
--- /dev/null
+++ b/src/mbgl/shader/sdf.fragment.glsl
@@ -0,0 +1,13 @@
+uniform sampler2D u_texture;
+uniform vec4 u_color;
+uniform float u_buffer;
+uniform float u_gamma;
+
+varying vec2 v_tex;
+varying float v_alpha;
+
+void main() {
+    float dist = texture2D(u_texture, v_tex).a;
+    float alpha = smoothstep(u_buffer - u_gamma, u_buffer + u_gamma, dist) * v_alpha;
+    gl_FragColor = u_color * alpha;
+}