diff options
| -rw-r--r-- | src/glsl/opt_dead_code.cpp | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/src/glsl/opt_dead_code.cpp b/src/glsl/opt_dead_code.cpp index c5be166e75a..c2ce0b94ece 100644 --- a/src/glsl/opt_dead_code.cpp +++ b/src/glsl/opt_dead_code.cpp @@ -75,6 +75,20 @@ do_dead_code(exec_list *instructions, bool uniform_locations_assigned) || !entry->declaration) continue; + /* Section 7.4.1 (Shader Interface Matching) of the OpenGL 4.5 + * (Core Profile) spec says: + * + * "With separable program objects, interfaces between shader + * stages may involve the outputs from one program object and the + * inputs from a second program object. For such interfaces, it is + * not possible to detect mismatches at link time, because the + * programs are linked separately. When each such program is + * linked, all inputs or outputs interfacing with another program + * stage are treated as active." + */ + if (entry->var->data.always_active_io) + continue; + if (!entry->assign_list.is_empty()) { /* Remove all the dead assignments to the variable we found. * Don't do so if it's a shader or function output, though. |