From 4a8444d5bc865119218eca8674e5614535f4829e Mon Sep 17 00:00:00 2001 From: "vadym.shovkoplias" Date: Thu, 23 Aug 2018 13:12:16 +0300 Subject: glsl/linker: Allow unused in blocks which are not declated on previous stage MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit >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." Fixes: * interstage-multiple-shader-objects.shader_test v2: Update comment in ir.h since the usage of "used" field has been extended. Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=101247 Signed-off-by: Vadym Shovkoplias Reviewed-by: Alejandro Piñeiro Reviewed-by: Timothy Arceri --- src/compiler/glsl/ir.h | 4 ++-- src/compiler/glsl/link_interface_blocks.cpp | 8 +++++++- 2 files changed, 9 insertions(+), 3 deletions(-) (limited to 'src/compiler') 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; -- cgit v1.2.3