glsl: recognize ARB_shading_language_420pack to be enabled with 4.20+

The 420pack extension enables various GLSL rules that need to be applied
to any GLSL 4.20+ shader even if the extension is not explicitly
enabled.

Signed-off-by: Ilia Mirkin <[email protected]>
Reviewed-by: Chris Forbes <[email protected]>

1 files changed, 5 insertions, 0 deletions

diff --git a/src/glsl/glsl_parser_extras.h b/src/glsl/glsl_parser_extras.h
index b65d53db641..eb325f04eed 100644
--- a/src/glsl/glsl_parser_extras.h
+++ b/src/glsl/glsl_parser_extras.h
@@ -231,6 +231,11 @@ struct _mesa_glsl_parse_state {
       return ARB_gpu_shader_fp64_enable || is_version(400, 0);
    }
 
+   bool has_420pack() const
+   {
+      return ARB_shading_language_420pack_enable || is_version(420, 0);
+   }
+
    void process_version_directive(YYLTYPE *locp, int version,
                                   const char *ident);