glsl: add xfb_* qualifiers to glsl_struct_field

These will be used to hold qualifier values for interface and
struct members.

Support is added to the struct/interface constructors to copy these
fields upon creation.

We also update record_compare() to ensure we don't reuse a glsl_type
with the wrong xfb_* qualifier values.

Reviewed-by: Dave Airlie <airlied@redhat.com>

src/compiler/glsl/builtin_variables.cpp

@@ -334,6 +334,8 @@ per_vertex_accumulator::add_field(int slot, const glsl_type *type,
    this->fields[this->num_fields].image_coherent = 0;
    this->fields[this->num_fields].image_volatile = 0;
    this->fields[this->num_fields].image_restrict = 0;
+   this->fields[this->num_fields].xfb_buffer = -1;
+   this->fields[this->num_fields].xfb_stride = -1;
    this->num_fields++;
 }
 

src/compiler/glsl_types.cpp

@@ -132,6 +132,8 @@ glsl_type::glsl_type(const glsl_struct_field *fields, unsigned num_fields,
       this->fields.structure[i].image_volatile = fields[i].image_volatile;
       this->fields.structure[i].image_restrict = fields[i].image_restrict;
       this->fields.structure[i].precision = fields[i].precision;
+      this->fields.structure[i].xfb_buffer = fields[i].xfb_buffer;
+      this->fields.structure[i].xfb_stride = fields[i].xfb_stride;
    }
 
    mtx_unlock(&glsl_type::mutex);
@@ -172,6 +174,8 @@ glsl_type::glsl_type(const glsl_struct_field *fields, unsigned num_fields,
       this->fields.structure[i].image_volatile = fields[i].image_volatile;
       this->fields.structure[i].image_restrict = fields[i].image_restrict;
       this->fields.structure[i].precision = fields[i].precision;
+      this->fields.structure[i].xfb_buffer = fields[i].xfb_buffer;
+      this->fields.structure[i].xfb_stride = fields[i].xfb_stride;
    }
 
    mtx_unlock(&glsl_type::mutex);
@@ -915,6 +919,12 @@ glsl_type::record_compare(const glsl_type *b) const
       if (this->fields.structure[i].precision
           != b->fields.structure[i].precision)
          return false;
+      if (this->fields.structure[i].xfb_buffer
+          != b->fields.structure[i].xfb_buffer)
+         return false;
+      if (this->fields.structure[i].xfb_stride
+          != b->fields.structure[i].xfb_stride)
+         return false;
    }
 
    return true;

src/compiler/glsl_types.h

@@ -839,12 +839,24 @@ struct glsl_struct_field {
 
    /**
     * For interface blocks, members may have an explicit byte offset
-    * specified; -1 otherwise.
+    * specified; -1 otherwise. Also used for xfb_offset layout qualifier.
     *
-    * Ignored for structs.
+    * Unless used for xfb_offset this field is ignored for structs.
     */
    int offset;
 
+   /**
+    * For interface blocks, members may define a transform feedback buffer;
+    * -1 otherwise.
+    */
+   int xfb_buffer;
+
+   /**
+    * For interface blocks, members may define a transform feedback stride;
+    * -1 otherwise.
+    */
+   int xfb_stride;
+
    /**
     * For interface blocks, the interpolation mode (as in
     * ir_variable::interpolation).  0 otherwise.