Mesa (master): glsl: Add frontend support for `sample` auxiliary storage qualifier

[Chris Forbes]

Module: Mesa
Branch: master
Commit: 51aa15aca2bf5764b8cd62bbf2329eda40f7a859
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=51aa15aca2bf5764b8cd62bbf2329eda40f7a859

Author: Chris Forbes <chrisf at ijw.co.nz>
Date:   Fri Nov 29 21:21:56 2013 +1300

glsl: Add frontend support for `sample` auxiliary storage qualifier

Signed-off-by: Chris Forbes <chrisf at ijw.co.nz>
Reviewed-by: Francisco Jerez <currojerez at riseup.net>

---

 src/glsl/ast.h                  |    1 +
 src/glsl/ast_type.cpp           |    3 ++-
 src/glsl/glsl_lexer.ll          |    2 +-
 src/glsl/glsl_parser.yy         |    9 +++++++--
 src/glsl/glsl_parser_extras.cpp |    2 ++
 5 files changed, 13 insertions(+), 4 deletions(-)

diff --git a/src/glsl/ast.h b/src/glsl/ast.h
index 5c214b6..76911f0 100644
--- a/src/glsl/ast.h
+++ b/src/glsl/ast.h
@@ -357,6 +357,7 @@ struct ast_type_qualifier {
 	 unsigned in:1;
 	 unsigned out:1;
 	 unsigned centroid:1;
+         unsigned sample:1;
 	 unsigned uniform:1;
 	 unsigned smooth:1;
 	 unsigned flat:1;
diff --git a/src/glsl/ast_type.cpp b/src/glsl/ast_type.cpp
index 2b088bf..d758bfa 100644
--- a/src/glsl/ast_type.cpp
+++ b/src/glsl/ast_type.cpp
@@ -90,7 +90,8 @@ ast_type_qualifier::has_storage() const
 bool
 ast_type_qualifier::has_auxiliary_storage() const
 {
-   return this->flags.q.centroid;
+   return this->flags.q.centroid
+          || this->flags.q.sample;
 }
 
 const char*
diff --git a/src/glsl/glsl_lexer.ll b/src/glsl/glsl_lexer.ll
index 822d70d..50875bf 100644
--- a/src/glsl/glsl_lexer.ll
+++ b/src/glsl/glsl_lexer.ll
@@ -520,7 +520,7 @@ readonly	KEYWORD(0, 300, 0, 0, READONLY);
 writeonly	KEYWORD(0, 300, 0, 0, WRITEONLY);
 resource	KEYWORD(0, 300, 0, 0, RESOURCE);
 patch		KEYWORD(0, 300, 0, 0, PATCH);
-sample		KEYWORD(0, 300, 0, 0, SAMPLE);
+sample		KEYWORD_WITH_ALT(400, 300, 400, 0, yyextra->ARB_gpu_shader5_enable, SAMPLE);
 subroutine	KEYWORD(0, 300, 0, 0, SUBROUTINE);
 
 
diff --git a/src/glsl/glsl_parser.yy b/src/glsl/glsl_parser.yy
index ada3690..1016554 100644
--- a/src/glsl/glsl_parser.yy
+++ b/src/glsl/glsl_parser.yy
@@ -1521,7 +1521,7 @@ type_qualifier:
    {
       if ($2.has_auxiliary_storage()) {
          _mesa_glsl_error(&@1, state,
-                          "duplicate auxiliary storage qualifier (centroid)");
+                          "duplicate auxiliary storage qualifier (centroid or sample)");
       }
 
       if (!state->ARB_shading_language_420pack_enable &&
@@ -1571,7 +1571,12 @@ auxiliary_storage_qualifier:
       memset(& $$, 0, sizeof($$));
       $$.flags.q.centroid = 1;
    }
-   /* TODO: "sample" and "patch" also go here someday. */
+   | SAMPLE
+   {
+      memset(& $$, 0, sizeof($$));
+      $$.flags.q.sample = 1;
+   }
+   /* TODO: "patch" also goes here someday. */
 
 storage_qualifier:
    CONST_TOK
diff --git a/src/glsl/glsl_parser_extras.cpp b/src/glsl/glsl_parser_extras.cpp
index 8e35090..2645c08 100644
--- a/src/glsl/glsl_parser_extras.cpp
+++ b/src/glsl/glsl_parser_extras.cpp
@@ -878,6 +878,8 @@ _mesa_ast_type_qualifier_print(const struct ast_type_qualifier *q)
 
    if (q->flags.q.centroid)
       printf("centroid ");
+   if (q->flags.q.sample)
+      printf("sample ");
    if (q->flags.q.uniform)
       printf("uniform ");
    if (q->flags.q.smooth)