mesa: Array uniform name length includes length of [0]

This is required by OpenGL ES 3.0 and desktop OpenGL 4.2.  Previous
version were ambiguous.  This also matches the behavior of NVIDIA's
closed-source driver (version 304.64).

Fixed gles3conformance test uniform_buffer_object_getactiveuniformsiv
and uniform_buffer_object_structure_and_array_element_names (on my
in-progress branch that fixes a bunch of other stuff...YMMV).

Signed-off-by: Ian Romanick <ian.d.romanick@intel.com>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>

src/mesa/main/uniform_query.cpp

@@ -122,6 +122,16 @@ _mesa_GetActiveUniformsiv(GLuint program,
 
       case GL_UNIFORM_NAME_LENGTH:
 	 params[i] = strlen(uni->name) + 1;
+
+         /* Page 61 (page 73 of the PDF) in section 2.11 of the OpenGL ES 3.0
+          * spec says:
+          *
+          *     "If the active uniform is an array, the uniform name returned
+          *     in name will always be the name of the uniform array appended
+          *     with "[0]"."
+          */
+         if (uni->array_elements != 0)
+            params[i] += 3;
 	 break;
 
       case GL_UNIFORM_BLOCK_INDEX: