glsl: Fix variable_referenced() for vector_{extract,insert} expressions

We get these when we operate on vector variables with array accessors
(i.e. things like a[0] where 'a' is a vec4). When we call variable_referenced()
on these expressions we want to return a reference to 'a' instead of NULL.

This fixes a problem where we pass a[0] as the first argument to an atomic
SSBO function that expects a buffer variable. In order to check this, we use
variable_referenced(), but that is currently returning NULL in this case, since
the underlying rvalue is a vector_extract expression.

Tested-by: Markus Wick <[email protected]>
Reviewed-by: Kristian Høgsberg <[email protected]>

1 files changed, 2 insertions, 0 deletions

diff --git a/src/glsl/ir.h b/src/glsl/ir.h
index 43a2bf0ae1c..9c9f22d018b 100644
--- a/src/glsl/ir.h
+++ b/src/glsl/ir.h
@@ -1731,6 +1731,8 @@ public:
 
    virtual ir_visitor_status accept(ir_hierarchical_visitor *);
 
+   virtual ir_variable *variable_referenced() const;
+
    ir_expression_operation operation;
    ir_rvalue *operands[4];
 };