glapi/gen: Add support for pointer types.

Signed-off-by: Dave Airlie <airlied@redhat.com>

src/mapi/glapi/gen/gl_API.dtd

@@ -26,6 +26,7 @@
                    size                NMTOKEN #REQUIRED
 		   float               (true | false) "false"
 		   unsigned            (true | false) "false"
+		   pointer             (true | false) "false"
                    glx_name            NMTOKEN #IMPLIED>
 <!ATTLIST enum     name                NMTOKEN #REQUIRED
                    count               CDATA   #IMPLIED

src/mapi/glapi/gen/gl_XML.py

@@ -340,6 +340,7 @@ class gl_type( gl_item ):
 		tn.size = int( element.nsProp( "size", None ), 0 )
 		tn.integer = not is_attr_true( element, "float" )
 		tn.unsigned = is_attr_true( element, "unsigned" )
+		tn.pointer = is_attr_true( element, "pointer" )
 		tn.name = "GL" + self.name
 		te.set_base_type_node( tn )
 

src/mapi/glapi/gen/typeexpr.py

@@ -252,7 +252,7 @@ class type_expression:
 
 
 	def get_stack_size(self):
-		tn = self.expr[ len(self.expr) - 1 ]
+		tn = self.expr[ -1 ]
 
 		if tn.elements or tn.pointer:
 			return 4
@@ -263,12 +263,12 @@ class type_expression:
 
 
 	def is_pointer(self):
-		tn = self.expr[ len(self.expr) - 1 ]
+		tn = self.expr[ -1 ]
 		return tn.pointer
 
 
 	def format_string(self):
-		tn = self.expr[ len(self.expr) - 1 ]
+		tn = self.expr[ -1 ]
 		if tn.pointer:
 			return "%p"
 		elif not tn.integer: