1 files changed, 12 insertions, 1 deletions
diff --git a/src/glsl/ir.h b/src/glsl/ir.h
index 9bbf3b7efae..8506f604058 100644
--- a/src/glsl/ir.h
+++ b/src/glsl/ir.h
@@ -453,7 +453,8 @@ public:
     *   - Vertex shader output: one of the values from \c gl_vert_result.
     *   - Fragment shader input: one of the values from \c gl_frag_attrib.
     *   - Fragment shader output: one of the values from \c gl_frag_result.
-    *   - Uniforms: Per-stage uniform slot number.
+    *   - Uniforms: Per-stage uniform slot number for default uniform block.
+    *   - Uniforms: Index within the uniform block definition for UBO members.
     *   - Other: This field is not currently used.
     *
     * If the variable is a uniform, shader input, or shader output, and the
@@ -462,6 +463,16 @@ public:
    int location;
 
    /**
+    * Uniform block number for uniforms.
+    *
+    * This index is into the shader's list of uniform blocks, not the
+    * linked program's merged list.
+    *
+    * If the variable is not in a uniform block, the value will be -1.
+    */
+   int uniform_block;
+
+   /**
     * output index for dual source blending.
     */
    int index;