i965: bring back type_size_vec4_times_4()

We will use this for output varyings. To make component
packing simpler we will just treat all varyings as vec4s.

Reviewed-by: Alejandro Piñeiro <apinheiro@igalia.com>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>

src/mesa/drivers/dri/i965/brw_fs.cpp

@@ -509,6 +509,19 @@ type_size_scalar(const struct glsl_type *type)
    return 0;
 }
 
+/**
+ * Returns the number of scalar components needed to store type, assuming
+ * that vectors are padded out to vec4.
+ *
+ * This has the packing rules of type_size_vec4(), but counts components
+ * similar to type_size_scalar().
+ */
+extern "C" int
+type_size_vec4_times_4(const struct glsl_type *type)
+{
+   return 4 * type_size_vec4(type);
+}
+
 /* Attribute arrays are loaded as one vec4 per element (or matrix column),
  * except for double-precision types, which are loaded as one dvec4.
  */

src/mesa/drivers/dri/i965/brw_shader.h

@@ -294,6 +294,7 @@ struct gl_linked_shader *brw_new_shader(gl_shader_stage stage);
 int type_size_scalar(const struct glsl_type *type);
 int type_size_vec4(const struct glsl_type *type);
 int type_size_dvec4(const struct glsl_type *type);
+int type_size_vec4_times_4(const struct glsl_type *type);
 int type_size_vs_input(const struct glsl_type *type);
 
 unsigned tesslevel_outer_components(GLenum tes_primitive_mode);