Mesa (master): glsl: Add default precision qualifiers to the symbol table

[Tapani Pälli]

Module: Mesa
Branch: master
Commit: e3082fb2732c2af836875201b8d7f49e864c8e4e
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=e3082fb2732c2af836875201b8d7f49e864c8e4e

Author: Iago Toral Quiroga <itoral at igalia.com>
Date:   Thu Feb 26 12:15:17 2015 +0100

glsl: Add default precision qualifiers to the symbol table

The GLSL ES spec specifies default precision qualifiers for certain types,
so populate the symbol table with these.

Notice that the desktop GLSL spec also indicates defaults for some types
but this is not really useful since precision qualifiers are completely
ignored in desktop GLSL.

v2: simplify and add samplerExternalOES, specified by
    OES_EGL_image_external (Tapani)

v3: add atomic_uint (reported missing by Marta)

Reviewed-by: Tapani Pälli <tapani.palli at intel.com>

---

 src/glsl/glsl_parser.yy |   12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/src/glsl/glsl_parser.yy b/src/glsl/glsl_parser.yy
index 4ac8e45..31e254a 100644
--- a/src/glsl/glsl_parser.yy
+++ b/src/glsl/glsl_parser.yy
@@ -313,6 +313,18 @@ translation_unit:
    {
       delete state->symbols;
       state->symbols = new(ralloc_parent(state)) glsl_symbol_table;
+      if (state->es_shader) {
+         if (state->stage == MESA_SHADER_FRAGMENT) {
+            state->symbols->add_default_precision_qualifier("int", ast_precision_medium);
+         } else {
+            state->symbols->add_default_precision_qualifier("float", ast_precision_high);
+            state->symbols->add_default_precision_qualifier("int", ast_precision_high);
+         }
+         state->symbols->add_default_precision_qualifier("sampler2D", ast_precision_low);
+         state->symbols->add_default_precision_qualifier("samplerExternalOES", ast_precision_low);
+         state->symbols->add_default_precision_qualifier("samplerCube", ast_precision_low);
+         state->symbols->add_default_precision_qualifier("atomic_uint", ast_precision_high);
+      }
       _mesa_glsl_initialize_types(state);
    }
    ;