1 files changed, 22 insertions, 0 deletions
diff --git a/modules/snap_context/resources/primitive_id_frag.glsl b/modules/snap_context/resources/primitive_id_frag.glsl
new file mode 100644
index 00000000..43801425
--- /dev/null
+++ b/modules/snap_context/resources/primitive_id_frag.glsl
@@ -0,0 +1,22 @@
+#version 120
+
+uniform bool use_clip_planes;
+varying vec4 clip_distance;
+
+uniform float offset;
+
+flat varying float primitive_id_var;
+
+void main()
+{
+	if (use_clip_planes &&
+	   ((clip_distance[0] < 0) ||
+	    (clip_distance[1] < 0) ||
+	    (clip_distance[2] < 0) ||
+	    (clip_distance[3] < 0)))
+	{
+		discard;
+	}
+
+	gl_FragColor = vec4(offset + primitive_id_var, 0, 0, 0);
+}