[Mesa-dev] [PATCH 2/7] glsl: Add default precision qualifiers to the symbol table

[Tapani Pälli]

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.

v2: simplify and add samplerExternalOES, specified by
    OES_EGL_image_external (Tapani)
---
 src/glsl/glsl_parser.yy | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/src/glsl/glsl_parser.yy b/src/glsl/glsl_parser.yy
index 4636435..4bef345 100644
--- a/src/glsl/glsl_parser.yy
+++ b/src/glsl/glsl_parser.yy
@@ -312,6 +312,17 @@ 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);
+      }
       _mesa_glsl_initialize_types(state);
    }
    ;
-- 
2.4.3