+
+/* layout_qualifieropt is packed into this rule */
+interface_block:
+ basic_interface_block
+ {
+ $$ = $1;
+ }
+ | layout_qualifier basic_interface_block
+ {
+ ast_interface_block *block = $2;
+ if (!block->layout.merge_qualifier(& @1, state, $1)) {
+ YYERROR;
+ }
+ $$ = block;
+ }
+ ;
+
+basic_interface_block:
+ interface_qualifier NEW_IDENTIFIER '{' member_list '}' instance_name_opt ';'
+ {
+ ast_interface_block *const block = $6;
+
+ block->block_name = $2;
+ block->declarations.push_degenerate_list_at_head(& $4->link);
+
+ if ($1.flags.q.uniform) {
+ if (!state->ARB_uniform_buffer_object_enable) {
+ _mesa_glsl_error(& @1, state,
+ "#version 140 / GL_ARB_uniform_buffer_object "
+ "required for defining uniform blocks\n");
+ } else if (state->ARB_uniform_buffer_object_warn) {
+ _mesa_glsl_warning(& @1, state,
+ "#version 140 / GL_ARB_uniform_buffer_object "
+ "required for defining uniform blocks\n");
+ }
+ } else {
+ if (state->es_shader || state->language_version < 150) {
+ _mesa_glsl_error(& @1, state,
+ "#version 150 required for using "
+ "interface blocks.\n");
+ }
+ }
+
+ /* From the GLSL 1.50.11 spec, section 4.3.7 ("Interface Blocks"):
+ * "It is illegal to have an input block in a vertex shader
+ * or an output block in a fragment shader"
+ */
+ if ((state->target == vertex_shader) && $1.flags.q.in) {
+ _mesa_glsl_error(& @1, state,
+ "`in' interface block is not allowed for "
+ "a vertex shader\n");
+ } else if ((state->target == fragment_shader) && $1.flags.q.out) {
+ _mesa_glsl_error(& @1, state,
+ "`out' interface block is not allowed for "
+ "a fragment shader\n");
+ }
+
+ /* Since block arrays require names, and both features are added in
+ * the same language versions, we don't have to explicitly
+ * version-check both things.
+ */
+ if (block->instance_name != NULL) {
+ state->check_version(150, 300, & @1, "interface blocks with "
+ "an instance name are not allowed");
+ }
+
+ unsigned interface_type_mask;
+ struct ast_type_qualifier temp_type_qualifier;
+
+ /* Get a bitmask containing only the in/out/uniform flags, allowing us
+ * to ignore other irrelevant flags like interpolation qualifiers.
+ */
+ temp_type_qualifier.flags.i = 0;
+ temp_type_qualifier.flags.q.uniform = true;
+ temp_type_qualifier.flags.q.in = true;
+ temp_type_qualifier.flags.q.out = true;
+ interface_type_mask = temp_type_qualifier.flags.i;
+
+ /* Get the block's interface qualifier. The interface_qualifier
+ * production rule guarantees that only one bit will be set (and
+ * it will be in/out/uniform).
+ */
+ unsigned block_interface_qualifier = $1.flags.i;
+
+ block->layout.flags.i |= block_interface_qualifier;
+
+ foreach_list_typed (ast_declarator_list, member, link, &block->declarations) {
+ ast_type_qualifier& qualifier = member->type->qualifier;
+ if ((qualifier.flags.i & interface_type_mask) == 0) {
+ /* GLSLangSpec.1.50.11, 4.3.7 (Interface Blocks):
+ * "If no optional qualifier is used in a member declaration, the
+ * qualifier of the variable is just in, out, or uniform as declared
+ * by interface-qualifier."
+ */
+ qualifier.flags.i |= block_interface_qualifier;
+ } else if ((qualifier.flags.i & interface_type_mask) !=
+ block_interface_qualifier) {
+ /* GLSLangSpec.1.50.11, 4.3.7 (Interface Blocks):
+ * "If optional qualifiers are used, they can include interpolation
+ * and storage qualifiers and they must declare an input, output,
+ * or uniform variable consistent with the interface qualifier of
+ * the block."
+ */
+ _mesa_glsl_error(& @1, state,
+ "uniform/in/out qualifier on "
+ "interface block member does not match "
+ "the interface block\n");
+ }
+ }
+
+ $$ = block;
+ }
+ ;
+
+interface_qualifier:
+ IN_TOK
+ {
+ memset(& $$, 0, sizeof($$));
+ $$.flags.q.in = 1;
+ }
+ | OUT_TOK
+ {
+ memset(& $$, 0, sizeof($$));
+ $$.flags.q.out = 1;
+ }
+ | UNIFORM
+ {
+ memset(& $$, 0, sizeof($$));
+ $$.flags.q.uniform = 1;
+ }
+ ;
+
+instance_name_opt:
+ /* empty */
+ {
+ $$ = new(state) ast_interface_block(*state->default_uniform_qualifier,
+ NULL,
+ NULL);
+ }
+ | NEW_IDENTIFIER
+ {
+ $$ = new(state) ast_interface_block(*state->default_uniform_qualifier,
+ $1,
+ NULL);
+ }
+ | NEW_IDENTIFIER '[' constant_expression ']'
+ {
+ $$ = new(state) ast_interface_block(*state->default_uniform_qualifier,
+ $1,
+ $3);
+ }
+ | NEW_IDENTIFIER '[' ']'
+ {
+ _mesa_glsl_error(& @1, state,
+ "instance block arrays must be explicitly sized\n");
+
+ $$ = new(state) ast_interface_block(*state->default_uniform_qualifier,
+ $1,
+ NULL);
+ }
+ ;
+
+member_list:
+ member_declaration
+ {
+ $$ = $1;
+ $1->link.self_link();
+ }
+ | member_declaration member_list
+ {
+ $$ = $1;
+ $2->link.insert_before(& $$->link);
+ }
+ ;
+
+member_declaration:
+ fully_specified_type struct_declarator_list ';'
+ {
+ void *ctx = state;
+ ast_fully_specified_type *type = $1;
+ type->set_location(yylloc);
+
+ if (type->qualifier.flags.q.attribute) {
+ _mesa_glsl_error(& @1, state,
+ "keyword 'attribute' cannot be used with "
+ "interface block member\n");
+ } else if (type->qualifier.flags.q.varying) {
+ _mesa_glsl_error(& @1, state,
+ "keyword 'varying' cannot be used with "
+ "interface block member\n");
+ }
+
+ $$ = new(ctx) ast_declarator_list(type);
+ $$->set_location(yylloc);
+ $$->ubo_qualifiers_valid = true;
+
+ $$->declarations.push_degenerate_list_at_head(& $2->link);
+ }
+ ;
+
+layout_defaults:
+ layout_qualifier UNIFORM ';'
+ {
+ if (!state->default_uniform_qualifier->merge_qualifier(& @1, state,
+ $1)) {
+ YYERROR;
+ }
+ }