1 files changed, 21 insertions, 0 deletions
diff --git a/src/mbgl/shader/pattern.fragment.glsl b/src/mbgl/shader/pattern.fragment.glsl
new file mode 100644
index 0000000000..ba6aed3023
--- /dev/null
+++ b/src/mbgl/shader/pattern.fragment.glsl
@@ -0,0 +1,21 @@
+uniform float u_opacity;
+uniform vec2 u_pattern_tl;
+uniform vec2 u_pattern_br;
+uniform float u_mix;
+
+uniform sampler2D u_image;
+
+varying vec2 v_pos;
+
+void main() {
+
+    vec2 imagecoord = mod(v_pos, 1.0);
+    vec2 pos = mix(u_pattern_tl, u_pattern_br, imagecoord);
+    vec4 color1 = texture2D(u_image, pos);
+
+    vec2 imagecoord2 = mod(imagecoord * 2.0, 1.0);
+    vec2 pos2 = mix(u_pattern_tl, u_pattern_br, imagecoord2);
+    vec4 color2 = texture2D(u_image, pos2);
+
+    gl_FragColor = mix(color1, color2, u_mix) * u_opacity;
+}