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/*
* Mesa 3-D graphics library
*
* Copyright (C) 2010 LunarG Inc.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*
* Authors:
* Chia-I Wu <olv@lunarg.com>
*/
#include <stdlib.h>
#include <string.h>
#include "u_current.h"
#include "u_thread.h"
#include "mapi.h"
#include "stub.h"
#include "table.h"
/* dynamic stubs will run out before this array */
static const struct mapi_stub *mapi_stub_map[MAPI_TABLE_NUM_SLOTS];
static int mapi_num_stubs;
static const struct mapi_stub *
get_stub(const char *name, const struct mapi_stub *alias)
{
const struct mapi_stub *stub;
stub = stub_find_public(name);
if (!stub) {
struct mapi_stub *dyn = stub_find_dynamic(name, 1);
if (dyn) {
stub_fix_dynamic(dyn, alias);
stub = dyn;
}
}
return stub;
}
/**
* Initialize mapi. spec consists of NULL-separated strings. The first string
* denotes the version. It is followed by variable numbers of entries. Each
* entry can have multiple names. An empty name terminates an entry. An empty
* entry terminates the spec. A spec of two entries, Foo and Bar, is as
* follows
*
* "1\0"
* "Foo\0"
* "FooEXT\0"
* "\0"
* "Bar\0"
* "\0"
*/
void
mapi_init(const char *spec)
{
u_mutex_declare_static(mutex);
const char *p;
int ver, count;
u_mutex_lock(mutex);
/* already initialized */
if (mapi_num_stubs) {
u_mutex_unlock(mutex);
return;
}
count = 0;
p = spec;
/* parse version string */
ver = atoi(p);
if (ver != 1) {
u_mutex_unlock(mutex);
return;
}
p += strlen(p) + 1;
while (*p) {
const struct mapi_stub *stub;
stub = get_stub(p, NULL);
/* out of dynamic entries */
if (!stub)
break;
p += strlen(p) + 1;
while (*p) {
get_stub(p, stub);
p += strlen(p) + 1;
}
mapi_stub_map[count++] = stub;
p++;
}
mapi_num_stubs = count;
u_mutex_unlock(mutex);
}
/**
* Return the address of an entry. Optionally generate the entry if it does
* not exist.
*/
mapi_proc
mapi_get_proc_address(const char *name)
{
const struct mapi_stub *stub;
stub = stub_find_public(name);
if (!stub)
stub = stub_find_dynamic(name, 0);
return (stub) ? (mapi_proc) stub_get_addr(stub) : NULL;
}
/**
* Create a dispatch table.
*/
struct mapi_table *
mapi_table_create(void)
{
const struct mapi_table *noop = table_get_noop();
struct mapi_table *tbl;
tbl = malloc(MAPI_TABLE_SIZE);
if (tbl)
memcpy(tbl, noop, MAPI_TABLE_SIZE);
return tbl;
}
/**
* Destroy a dispatch table.
*/
void
mapi_table_destroy(struct mapi_table *tbl)
{
free(tbl);
}
/**
* Fill a dispatch table. The order of the procs is determined when mapi_init
* is called.
*/
void
mapi_table_fill(struct mapi_table *tbl, const mapi_proc *procs)
{
const struct mapi_table *noop = table_get_noop();
int i;
for (i = 0; i < mapi_num_stubs; i++) {
const struct mapi_stub *stub = mapi_stub_map[i];
int slot = stub_get_slot(stub);
mapi_func func = (mapi_func) procs[i];
if (!func)
func = table_get_func(noop, slot);
table_set_func(tbl, slot, func);
}
}
/**
* Make a dispatch table current.
*/
void
mapi_table_make_current(const struct mapi_table *tbl)
{
u_current_set(tbl);
}
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