bump On 10/09/2018 03:07 PM, Ian Romanick wrote: > From: Ian Romanick <ian.d.roman...@intel.com> > > Section 3.7 (Identifiers) of the GLSL spec says: > > However, as noted in the specification, there are some cases where > previously declared variables can be redeclared to change or add > some property, and predeclared "gl_" names are allowed to be > redeclared in a shader only for these specific purposes. More > generally, it is an error to redeclare a variable, including those > starting "gl_". > > This patch should fix piglit tests: > clip-distance-redeclare-without-inout.frag > clip-distance-redeclare-without-inout.vert > > However, this causes a regression in > clip-distance-out-values.shader_test. A fix for that test has been sent > to the piglit list for review: > > https://patchwork.freedesktop.org/patch/255201/ > > As far as I understood following mailing thread: > https://lists.freedesktop.org/archives/piglit/2013-October/007935.html > looks like we have accepted to remove an ability to change qualifiers > but have not done it yet. Unless I missed something) > > v2 (idr): Move 'earlier->data.mode != var->data.mode' test much earlier > in the function. Add special handling for gl_LastFragData. > > Signed-off-by: Andrii Simiklit <andrii.simik...@globallogic.com> > Signed-off-by: Ian Romanick <ian.d.roman...@intel.com> > --- > src/compiler/glsl/ast_to_hir.cpp | 51 > +++++++++++++++++++++------------------- > 1 file changed, 27 insertions(+), 24 deletions(-) > > diff --git a/src/compiler/glsl/ast_to_hir.cpp > b/src/compiler/glsl/ast_to_hir.cpp > index 1082d6c91cf..2e4c9ef6776 100644 > --- a/src/compiler/glsl/ast_to_hir.cpp > +++ b/src/compiler/glsl/ast_to_hir.cpp > @@ -4238,6 +4238,29 @@ get_variable_being_redeclared(ir_variable **var_ptr, > YYLTYPE loc, > > *is_redeclaration = true; > > + if (earlier->data.how_declared == ir_var_declared_implicitly) { > + /* Verify that the redeclaration of a built-in does not change the > + * storage qualifier. There are a couple special cases. > + * > + * 1. Some built-in variables that are defined as 'in' in the > + * specification are implemented as system values. Allow > + * ir_var_system_value -> ir_var_shader_in. > + * > + * 2. gl_LastFragData is implemented as a ir_var_shader_out, but the > + * specification requires that redeclarations omit any qualifier. > + * Allow ir_var_shader_out -> ir_var_auto for this one variable. > + */ > + if (earlier->data.mode != var->data.mode && > + !(earlier->data.mode == ir_var_system_value && > + var->data.mode == ir_var_shader_in) && > + !(strcmp(var->name, "gl_LastFragData") == 0 && > + var->data.mode == ir_var_auto)) { > + _mesa_glsl_error(&loc, state, > + "redeclaration cannot change qualification of > `%s'", > + var->name); > + } > + } > + > /* From page 24 (page 30 of the PDF) of the GLSL 1.50 spec, > * > * "It is legal to declare an array without a size and then > @@ -4246,11 +4269,6 @@ get_variable_being_redeclared(ir_variable **var_ptr, > YYLTYPE loc, > */ > if (earlier->type->is_unsized_array() && var->type->is_array() > && (var->type->fields.array == earlier->type->fields.array)) { > - /* FINISHME: This doesn't match the qualifiers on the two > - * FINISHME: declarations. It's not 100% clear whether this is > - * FINISHME: required or not. > - */ > - > const int size = var->type->array_size(); > check_builtin_array_max_size(var->name, size, loc, state); > if ((size > 0) && (size <= earlier->data.max_array_access)) { > @@ -4342,28 +4360,13 @@ get_variable_being_redeclared(ir_variable **var_ptr, > YYLTYPE loc, > earlier->data.precision = var->data.precision; > earlier->data.memory_coherent = var->data.memory_coherent; > > - } else if (earlier->data.how_declared == ir_var_declared_implicitly && > - state->allow_builtin_variable_redeclaration) { > + } else if ((earlier->data.how_declared == ir_var_declared_implicitly && > + state->allow_builtin_variable_redeclaration) || > + allow_all_redeclarations) { > /* Allow verbatim redeclarations of built-in variables. Not explicitly > * valid, but some applications do it. > */ > - if (earlier->data.mode != var->data.mode && > - !(earlier->data.mode == ir_var_system_value && > - var->data.mode == ir_var_shader_in)) { > - _mesa_glsl_error(&loc, state, > - "redeclaration of `%s' with incorrect qualifiers", > - var->name); > - } else if (earlier->type != var->type) { > - _mesa_glsl_error(&loc, state, > - "redeclaration of `%s' has incorrect type", > - var->name); > - } > - } else if (allow_all_redeclarations) { > - if (earlier->data.mode != var->data.mode) { > - _mesa_glsl_error(&loc, state, > - "redeclaration of `%s' with incorrect qualifiers", > - var->name); > - } else if (earlier->type != var->type) { > + if (earlier->type != var->type) { > _mesa_glsl_error(&loc, state, > "redeclaration of `%s' has incorrect type", > var->name); >
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