glsl2: Add a pass to convert mod(a, b) to b * fract(a/b).

This is used by the Mesa IR backend to implement mod, fixing glsl-fs-mod.

1 files changed, 12 insertions, 0 deletions

diff --git a/src/glsl/ir_hierarchical_visitor.h b/src/glsl/ir_hierarchical_visitor.h
index 2c4590d4b1..afa780dc91 100644
--- a/src/glsl/ir_hierarchical_visitor.h
+++ b/src/glsl/ir_hierarchical_visitor.h
@@ -141,6 +141,16 @@ public:
     */
    void run(struct exec_list *instructions);
 
+   /* Some visitors may need to insert new variable declarations and
+    * assignments for portions of a subtree, which means they need a
+    * pointer to the current instruction in the stream, not just their
+    * node in the tree rooted at that instruction.
+    *
+    * This is implemented by visit_list_elements -- if the visitor is
+    * not called by it, nothing good will happen.
+    */
+   class ir_instruction *base_ir;
+
    /**
     * Callback function that is invoked on entry to each node visited.
     *
@@ -161,4 +171,6 @@ void visit_tree(ir_instruction *ir,
 		void (*callback)(class ir_instruction *ir, void *data),
 		void *data);
 
+ir_visitor_status visit_list_elements(ir_hierarchical_visitor *v, exec_list *l);
+
 #endif /* IR_HIERARCHICAL_VISITOR_H */