glsl: Move interface block processing to glsl_parser_extras.cpp

[mesa.git] / src / glsl / glsl_parser_extras.cpp

diff --git a/src/glsl/glsl_parser_extras.cpp b/src/glsl/glsl_parser_extras.cpp
index 7d976c26f8cf8134c29ac21bd8273a5fe8d2fae3..67ef014c06874660584951cb24f6df0db8e315e7 100644 (file)
--- a/src/glsl/glsl_parser_extras.cpp
+++ b/src/glsl/glsl_parser_extras.cpp
@@ -859,6 +859,128 @@ _mesa_ast_set_aggregate_type(const glsl_type *type,
    }
 }
 
+void
+_mesa_ast_process_interface_block(YYLTYPE *locp,
+                                  _mesa_glsl_parse_state *state,
+                                  ast_interface_block *const block,
+                                  const struct ast_type_qualifier q)
+{
+   if (q.flags.q.uniform) {
+      if (!state->has_uniform_buffer_objects()) {
+         _mesa_glsl_error(locp, state,
+                          "#version 140 / GL_ARB_uniform_buffer_object "
+                          "required for defining uniform blocks");
+      } else if (state->ARB_uniform_buffer_object_warn) {
+         _mesa_glsl_warning(locp, state,
+                            "#version 140 / GL_ARB_uniform_buffer_object "
+                            "required for defining uniform blocks");
+      }
+   } else {
+      if (state->es_shader || state->language_version < 150) {
+         _mesa_glsl_error(locp, state,
+                          "#version 150 required for using "
+                          "interface blocks");
+      }
+   }
+
+   /* 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->stage == MESA_SHADER_VERTEX) && q.flags.q.in) {
+      _mesa_glsl_error(locp, state,
+                       "`in' interface block is not allowed for "
+                       "a vertex shader");
+   } else if ((state->stage == MESA_SHADER_FRAGMENT) && q.flags.q.out) {
+      _mesa_glsl_error(locp, state,
+                       "`out' interface block is not allowed for "
+                       "a fragment shader");
+   }
+
+   /* 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, locp, "interface blocks with "
+                           "an instance name are not allowed");
+   }
+
+   uint64_t 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).
+    */
+   uint64_t block_interface_qualifier = q.flags.i;
+
+   block->layout.flags.i |= block_interface_qualifier;
+
+   if (state->stage == MESA_SHADER_GEOMETRY &&
+       state->has_explicit_attrib_stream()) {
+      /* Assign global layout's stream value. */
+      block->layout.flags.q.stream = 1;
+      block->layout.flags.q.explicit_stream = 0;
+      block->layout.stream = state->out_qualifier->stream;
+   }
+
+   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(locp, state,
+                          "uniform/in/out qualifier on "
+                          "interface block member does not match "
+                          "the interface block");
+      }
+
+      /* From GLSL ES 3.0, chapter 4.3.7 "Interface Blocks":
+       *
+       * "GLSL ES 3.0 does not support interface blocks for shader inputs or
+       * outputs."
+       *
+       * And from GLSL ES 3.0, chapter 4.6.1 "The invariant qualifier":.
+       *
+       * "Only variables output from a shader can be candidates for
+       * invariance."
+       *
+       * From GLSL 4.40 and GLSL 1.50, section "Interface Blocks":
+       *
+       * "If optional qualifiers are used, they can include interpolation
+       * qualifiers, auxiliary storage qualifiers, and storage qualifiers
+       * and they must declare an input, output, or uniform member
+       * consistent with the interface qualifier of the block"
+       */
+      if (qualifier.flags.q.invariant)
+         _mesa_glsl_error(locp, state,
+                          "invariant qualifiers cannot be used "
+                          "with interface blocks members");
+   }
+}
 
 void
 _mesa_ast_type_qualifier_print(const struct ast_type_qualifier *q)