From c034dbeda8850fe1f3ec0dbdbd73344ace024748 Mon Sep 17 00:00:00 2001 From: Kenneth Graunke Date: Mon, 11 Jan 2016 14:51:38 -0800 Subject: [PATCH] glsl: Make read_from_write_only_variable_visitor ignore .length(). .length() on an unsized SSBO variable doesn't actually read any data from the SSBO, and is allowed on variables marked 'writeonly'. Fixes compute shader compilation in Shadow of Mordor. Signed-off-by: Kenneth Graunke Reviewed-by: Iago Toral Quiroga Reviewed-by: Matt Turner --- src/glsl/ast_to_hir.cpp | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/src/glsl/ast_to_hir.cpp b/src/glsl/ast_to_hir.cpp index f3966d7..13696a3 100644 --- a/src/glsl/ast_to_hir.cpp +++ b/src/glsl/ast_to_hir.cpp @@ -106,6 +106,15 @@ public: return found; } + virtual ir_visitor_status visit_enter(ir_expression *ir) + { + /* .length() doesn't actually read anything */ + if (ir->operation == ir_unop_ssbo_unsized_array_length) + return visit_continue_with_parent; + + return visit_continue; + } + private: ir_variable *found; }; -- 2.7.4