[Mesa-dev] [PATCH 1/6] glsl: Add API to put default precision qualifiers in the symbol table

[Iago Toral Quiroga]

These have scoping rules that match the ones defined for other things such
as variables, so we want them in the symbol table.
---
 src/glsl/glsl_symbol_table.cpp | 24 ++++++++++++++++++++++++
 src/glsl/glsl_symbol_table.h   |  2 ++
 2 files changed, 26 insertions(+)

diff --git a/src/glsl/glsl_symbol_table.cpp b/src/glsl/glsl_symbol_table.cpp
index 2294dda..dd165ee 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:
@@ -195,6 +196,20 @@ 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);
@@ -228,6 +243,15 @@ 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);
    /*@}*/
 
    /**
-- 
1.9.1