diff options
| -rw-r--r-- | src/compiler/glsl/ir.h | 4 | ||||
| -rw-r--r-- | src/compiler/glsl/link_interface_blocks.cpp | 8 |
2 files changed, 9 insertions, 3 deletions
diff --git a/src/compiler/glsl/ir.h b/src/compiler/glsl/ir.h index 67b38f48eff..d05d1998a50 100644 --- a/src/compiler/glsl/ir.h +++ b/src/compiler/glsl/ir.h @@ -667,8 +667,8 @@ public: * variable has been used. For example, it is an error to redeclare a * variable as invariant after it has been used. * - * This is only maintained in the ast_to_hir.cpp path, not in - * Mesa's fixed function or ARB program paths. + * This is maintained in the ast_to_hir.cpp path and during linking, + * but not in Mesa's fixed function or ARB program paths. */ unsigned used:1; diff --git a/src/compiler/glsl/link_interface_blocks.cpp b/src/compiler/glsl/link_interface_blocks.cpp index e5eca9460e3..801fbcd5d9f 100644 --- a/src/compiler/glsl/link_interface_blocks.cpp +++ b/src/compiler/glsl/link_interface_blocks.cpp @@ -417,9 +417,15 @@ validate_interstage_inout_blocks(struct gl_shader_program *prog, * write to any of the pre-defined outputs (e.g. if the vertex shader * does not write to gl_Position, etc), which is allowed and results in * undefined behavior. + * + * From Section 4.3.4 (Inputs) of the GLSL 1.50 spec: + * + * "Only the input variables that are actually read need to be written + * by the previous stage; it is allowed to have superfluous + * declarations of input variables." */ if (producer_def == NULL && - !is_builtin_gl_in_block(var, consumer->Stage)) { + !is_builtin_gl_in_block(var, consumer->Stage) && var->data.used) { linker_error(prog, "Input block `%s' is not an output of " "the previous stage\n", var->get_interface_type()->name); return; |