From 9de651b261286f15ae000e4a698587b805b95d2b Mon Sep 17 00:00:00 2001 From: Iago Toral Quiroga Date: Mon, 5 Oct 2015 11:42:43 +0200 Subject: [PATCH] glsl: Fix variable_referenced() for vector_{extract,insert} expressions MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit 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 Reviewed-by: Kristian Høgsberg --- src/glsl/ir.cpp | 16 ++++++++++++++++ src/glsl/ir.h | 2 ++ 2 files changed, 18 insertions(+) diff --git a/src/glsl/ir.cpp b/src/glsl/ir.cpp index 2c45b9e..4c22843 100644 --- a/src/glsl/ir.cpp +++ b/src/glsl/ir.cpp @@ -662,6 +662,22 @@ ir_expression::get_operator(const char *str) return (ir_expression_operation) -1; } +ir_variable * +ir_expression::variable_referenced() const +{ + switch (operation) { + case ir_binop_vector_extract: + case ir_triop_vector_insert: + /* We get these for things like a[0] where a is a vector type. In these + * cases we want variable_referenced() to return the actual vector + * variable this is wrapping. + */ + return operands[0]->variable_referenced(); + default: + return ir_rvalue::variable_referenced(); + } +} + ir_constant::ir_constant() : ir_rvalue(ir_type_constant) { diff --git a/src/glsl/ir.h b/src/glsl/ir.h index 43a2bf0..9c9f22d 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]; }; -- 2.7.4