python: Make swig bindings python independent.

src/gallium/state_trackers/python/gallium.i

@@ -37,7 +37,6 @@
 %{
 
 #include <stdio.h>
-#include <Python.h>
 
 #include "pipe/p_screen.h"
 #include "pipe/p_context.h"
@@ -58,7 +57,7 @@
 %}
 
 %include "typemaps.i"
-
+%include "exception.i"
 %include "cstring.i"
 
 %include "carrays.i"

src/gallium/state_trackers/python/p_texture.i

@@ -347,16 +347,15 @@
       
       assert(p_atomic_read(&$self->reference.count) > 0);
       
-      if(offset > $self->size) {
-         PyErr_SetString(PyExc_ValueError, "offset must be smaller than buffer size");
-         return;
-      }
+      if(offset > $self->size)
+         SWIG_exception(SWIG_ValueError, "offset must be smaller than buffer size");
 
-      if(offset + LENGTH > $self->size) {
-         PyErr_SetString(PyExc_ValueError, "data length must fit inside the buffer");
-         return;
-      }
+      if(offset + LENGTH > $self->size)
+         SWIG_exception(SWIG_ValueError, "data length must fit inside the buffer");
 
       pipe_buffer_write(screen, $self, offset, LENGTH, STRING);
+
+fail:
+      return;
    }
 };