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diff --git a/include/graviface.h b/include/graviface.h
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--- a/include/graviface.h
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-/*
- grav - N-body gravity simulation
-
- Copyright (C) 2011 Ian Cowburn <ianc@noddybox.co.uk>
-
- This program is free software: you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation, either version 3 of the License, or
- (at your option) any later version.
-
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with this program. If not, see <http://www.gnu.org/licenses/>.
-
- $Id$
-
- This file provides a common interface shared between the core grav
- program and the GFX drivers.
-*/
-
-#ifndef GRAV_GRAVIFACE_H
-#define GRAV_GRAVIFACE_H "$Id$"
-
-#include <mp.h>
-
-
-/* ---------------------------------------------------------------------------
- This determinate the version of the interface, so both sides can
- check they were built with the same interface.
-*/
-#define GRAV_INTERFACE_VERSION 1
-
-
-/* ---------------------------------------------------------------------------
- This type defines an instance of any data that the driver needs to maintain.
- As the drivers are sharable objects, it is recommended that this points to
- dynamic memory.
-*/
-typedef void *grav_interface_t;
-
-
-/* ---------------------------------------------------------------------------
- This structure is passed to the driver on initialisation so it can check
- compataility. The first field is guaranteed to be an int holding
- GRAV_INTERFACE_VERSION.
-*/
-typedef struct
-{
- /* Interface version info.
- */
- int grav_interface_version;
-
- /* The version of the GNU MP library the core is compiled against.
- */
- int grav_mp_version_major;
- int grav_mp_version_minor;
-
- /* An interface the driver can use to iterate over loaded config.
- p_func is called for every variable in the section along with the
- pass client data.
- */
- const char (*grav_config_func)(const char *p_section,
- void (*p_func)(void *p_client_data,
- const char *p_section,
- const char *p_value),
- void *p_client_data);
-
- /* An interface the driver can use to request termination. p_reason can
- be NULL.
- */
- void (*grav_exit_func)(const char *p_reason);,
-
-} grav_icb_t;
-
-
-/* ---------------------------------------------------------------------------
- This structure defines a mass to be drawn. Masses are passed in arbitary
- order. Each mass has a unique identifier, which is defined by "id".
-*/
-typedef struct
-{
- mpz_t id;
-} grav_public_mass_t;
-
-
-/* ---------------------------------------------------------------------------
- This function must be exported by the driver, and is used to initialise the
- driver. If the driver disagrees with the version then false should be
- returned, otherwise true.
-
- The passed pointer is a pointer to a grav_icb_t.
-*/
-typedef int (*grav_interface_init_func)(const void *p);
-
-
-#endif /* GRAV_GRAVIFACE_H */