glsl: Add API to put default precision qualifiers in the symbol table

These have scoping rules that match the ones defined for other things such
as variables, so we want them in the symbol table.

Reviewed-by: Tapani Pälli <tapani.palli@intel.com>
Reviewed-by: Samuel Iglesias Gonsálvez <siglesias@igalia.com>

2 files changed, 26 insertions, 0 deletions

diff --git a/src/glsl/glsl_symbol_table.cpp b/src/glsl/glsl_symbol_table.cpp
index 536f0a3..6c682ac 100644
--- a/src/glsl/glsl_symbol_table.cpp
+++ b/src/glsl/glsl_symbol_table.cpp
@@ -23,6 +23,7 @@
  */
 
 #include "glsl_symbol_table.h"
+#include "ast.h"
 
 class symbol_table_entry {
 public:
@@ -201,6 +202,20 @@ bool glsl_symbol_table::add_function(ir_function *f)
    return _mesa_symbol_table_add_symbol(table, -1, f->name, entry) == 0;
 }
 
+bool glsl_symbol_table::add_default_precision_qualifier(const char *type_name,
+                                                        int precision)
+{
+   char *name = ralloc_asprintf(mem_ctx, "#default_precision_%s", type_name);
+
+   ast_type_specifier *default_specifier = new(mem_ctx) ast_type_specifier(name);
+   default_specifier->default_precision = precision;
+
+   symbol_table_entry *entry =
+      new(mem_ctx) symbol_table_entry(default_specifier);
+
+   return _mesa_symbol_table_add_symbol(table, -1, name, entry) == 0;
+}
+
 void glsl_symbol_table::add_global_function(ir_function *f)
 {
    symbol_table_entry *entry = new(mem_ctx) symbol_table_entry(f);
@@ -234,6 +249,15 @@ ir_function *glsl_symbol_table::get_function(const char *name)
    return entry != NULL ? entry->f : NULL;
 }
 
+int glsl_symbol_table::get_default_precision_qualifier(const char *type_name)
+{
+   char *name = ralloc_asprintf(mem_ctx, "#default_precision_%s", type_name);
+   symbol_table_entry *entry = get_entry(name);
+   if (!entry)
+      return ast_precision_none;
+   return entry->a->default_precision;
+}
+
 symbol_table_entry *glsl_symbol_table::get_entry(const char *name)
 {
    return (symbol_table_entry *)
diff --git a/src/glsl/glsl_symbol_table.h b/src/glsl/glsl_symbol_table.h
index e32b88b..5d654e5 100644
--- a/src/glsl/glsl_symbol_table.h
+++ b/src/glsl/glsl_symbol_table.h
@@ -72,6 +72,7 @@ struct glsl_symbol_table {
    bool add_function(ir_function *f);
    bool add_interface(const char *name, const glsl_type *i,
                       enum ir_variable_mode mode);
+   bool add_default_precision_qualifier(const char *type_name, int precision);
    /*@}*/
 
    /**
@@ -88,6 +89,7 @@ struct glsl_symbol_table {
    ir_function *get_function(const char *name);
    const glsl_type *get_interface(const char *name,
                                   enum ir_variable_mode mode);
+   int get_default_precision_qualifier(const char *type_name);
    /*@}*/
 
    /**