[Mesa-dev] [PATCH 13/17] glsl: Add default precision qualifiers to the symbol table

[Samuel Iglesias Gonsalvez]

From: Iago Toral Quiroga <itoral at igalia.com>

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.
---
 src/glsl/glsl_parser.yy | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/src/glsl/glsl_parser.yy b/src/glsl/glsl_parser.yy
index e66b80a..f55fd23 100644
--- a/src/glsl/glsl_parser.yy
+++ b/src/glsl/glsl_parser.yy
@@ -310,6 +310,20 @@ 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);
+            state->symbols->add_default_precision_qualifier("sampler2D", ast_precision_low);
+            state->symbols->add_default_precision_qualifier("samplerCube", ast_precision_low);
+            state->symbols->add_default_precision_qualifier("samplerExternalOES", ast_precision_low);
+         } 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("samplerCube", ast_precision_low);
+            state->symbols->add_default_precision_qualifier("samplerExternalOES", ast_precision_low);
+         }
+      }
       _mesa_glsl_initialize_types(state);
    }
    ;
-- 
2.4.3