[Mesa-dev] [PATCH] glsl: simplify interface block stream qualifier validation

[Timothy Arceri]

Qualifiers on member variables are redundent all we need to do
if check if it matches the stream associated with the block and
throw an error if its not.

Cc: Samuel Iglesias Gonsalvez <siglesias at igalia.com>
Cc: Emil Velikov <emil.l.velikov at gmail.com>
---
 src/glsl/ast_to_hir.cpp   | 27 +++++++++++++--------------
 src/glsl/nir/glsl_types.h | 10 +---------
 2 files changed, 14 insertions(+), 23 deletions(-)

diff --git a/src/glsl/ast_to_hir.cpp b/src/glsl/ast_to_hir.cpp
index 0306530..5a22820 100644
--- a/src/glsl/ast_to_hir.cpp
+++ b/src/glsl/ast_to_hir.cpp
@@ -5964,8 +5964,19 @@ ast_process_structure_or_interface_block(exec_list *instructions,
          fields[i].sample = qual->flags.q.sample ? 1 : 0;
          fields[i].patch = qual->flags.q.patch ? 1 : 0;
 
-         /* Only save explicitly defined streams in block's field */
-         fields[i].stream = qual->flags.q.explicit_stream ? qual->stream : -1;
+         /* From Section 4.4.2.3 (Geometry Outputs) of the GLSL 4.50 spec:
+          *
+          *   "A block member may be declared with a stream identifier, but
+          *   the specified stream must match the stream associated with the
+          *   containing block."
+          */
+         if (qual->flags.q.explicit_stream &&
+             qual->stream != layout->stream) {
+            _mesa_glsl_error(&loc, state, "stream layout qualifier on "
+                             "interface block member `%s' does not match "
+                             "the interface block (%d vs %d)",
+                             fields[i].name, qual->stream, layout->stream);
+         }
 
          if (qual->flags.q.row_major || qual->flags.q.column_major) {
             if (!qual->flags.q.uniform && !qual->flags.q.buffer) {
@@ -6267,18 +6278,6 @@ ast_interface_block::hir(exec_list *instructions,
 
    state->struct_specifier_depth--;
 
-   for (unsigned i = 0; i < num_variables; i++) {
-      if (fields[i].stream != -1 &&
-          (unsigned) fields[i].stream != this->layout.stream) {
-         _mesa_glsl_error(&loc, state,
-                          "stream layout qualifier on "
-                          "interface block member `%s' does not match "
-                          "the interface block (%d vs %d)",
-                          fields[i].name, fields[i].stream,
-                          this->layout.stream);
-      }
-   }
-
    if (!redeclaring_per_vertex) {
       validate_identifier(this->block_name, loc, state);
 
diff --git a/src/glsl/nir/glsl_types.h b/src/glsl/nir/glsl_types.h
index 52ca826..1f17ad5 100644
--- a/src/glsl/nir/glsl_types.h
+++ b/src/glsl/nir/glsl_types.h
@@ -829,13 +829,6 @@ struct glsl_struct_field {
    unsigned patch:1;
 
    /**
-    * For interface blocks, it has a value if this variable uses multiple vertex
-    * streams (as in ir_variable::stream). -1 otherwise.
-    */
-   int stream;
-
-
-   /**
     * Image qualifiers, applicable to buffer variables defined in shader
     * storage buffer objects (SSBOs)
     */
@@ -847,8 +840,7 @@ struct glsl_struct_field {
 
    glsl_struct_field(const struct glsl_type *_type, const char *_name)
       : type(_type), name(_name), location(-1), interpolation(0), centroid(0),
-        sample(0), matrix_layout(GLSL_MATRIX_LAYOUT_INHERITED), patch(0),
-        stream(-1)
+        sample(0), matrix_layout(GLSL_MATRIX_LAYOUT_INHERITED), patch(0)
    {
       /* empty */
    }
-- 
2.4.3