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/*
* Mesa 3-D graphics library
* Version: 7.7
*
* Copyright (C) 2009 Chia-I Wu <olv@0xlab.org>
*
* 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
* BRIAN PAUL 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.
*/
/**
* \file remap.c
* Remap table management.
*
* Entries in the dispatch table are either static or dynamic. The
* dispatch table is shared by mesa core and glapi. When they are
* built separately, it is possible that a static entry in mesa core
* is dynamic, or assigned a different static offset, in glapi. The
* remap table is in charge of mapping a static entry in mesa core to
* a dynamic entry, or the corresponding static entry, in glapi.
*/
#include "remap.h"
#include "imports.h"
#include "glapi/dispatch.h"
#if FEATURE_remap_table
#define need_MESA_remap_table
#include "remap_helper.h"
#define ARRAY_SIZE(a) (sizeof (a) / sizeof ((a)[0]))
#define MAX_ENTRY_POINTS 16
/* this is global for quick access */
int driDispatchRemapTable[driDispatchRemapTable_size];
/**
* Return the spec string associated with the given function index.
* The index is available from including remap_helper.h.
*
* \param func_index an opaque function index.
*
* \return the spec string associated with the function index, or NULL.
*/
const char *
_mesa_get_function_spec(GLint func_index)
{
if (func_index < ARRAY_SIZE(_mesa_function_pool))
return _mesa_function_pool + func_index;
else
return NULL;
}
/**
* Map a function by its spec. The function will be added to glapi,
* and the dispatch offset will be returned.
*
* \param spec a '\0'-separated string array specifying a function.
* It begins with the parameter signature of the function,
* followed by the names of the entry points. An empty entry
* point name terminates the array.
*
* \return the offset of the (re-)mapped function in the dispatch
* table, or -1.
*/
GLint
_mesa_map_function_spec(const char *spec)
{
const char *signature;
const char *names[MAX_ENTRY_POINTS + 1];
GLint num_names = 0;
if (!spec)
return -1;
signature = spec;
spec += strlen(spec) + 1;
/* spec is terminated by an empty string */
while (*spec) {
names[num_names] = spec;
num_names++;
if (num_names >= MAX_ENTRY_POINTS)
break;
spec += strlen(spec) + 1;
}
if (!num_names)
return -1;
names[num_names] = NULL;
/* add the entry points to the dispatch table */
return _glapi_add_dispatch(names, signature);
}
/**
* Map an array of functions. This is a convenient function for
* use with arrays available from including remap_helper.h.
*
* Note that the dispatch offsets of the functions are not returned.
* If they are needed, _mesa_map_function_spec() should be used.
*
* \param func_array an array of function remaps.
*/
void
_mesa_map_function_array(const struct gl_function_remap *func_array)
{
GLint i;
if (!func_array)
return;
for (i = 0; func_array[i].func_index != -1; i++) {
const char *spec;
GLint offset;
spec = _mesa_get_function_spec(func_array[i].func_index);
if (!spec) {
_mesa_problem(NULL, "invalid function index %d",
func_array[i].func_index);
continue;
}
offset = _mesa_map_function_spec(spec);
/* error checks */
if (offset < 0) {
const char *name = spec + strlen(spec) + 1;
_mesa_warning(NULL, "failed to remap %s", name);
}
else if (func_array[i].dispatch_offset >= 0 &&
offset != func_array[i].dispatch_offset) {
const char *name = spec + strlen(spec) + 1;
_mesa_problem(NULL, "%s should be mapped to %d, not %d",
name, func_array[i].dispatch_offset, offset);
}
}
}
/**
* Map the functions which are already static.
*
* When a extension function are incorporated into the ABI, the
* extension suffix is usually stripped. Mapping such functions
* makes sure the alternative names are available.
*
* Note that functions mapped by _mesa_init_remap_table() are
* excluded.
*/
void
_mesa_map_static_functions(void)
{
/* Remap static functions which have alternative names and are in the ABI.
* This is to be on the safe side. glapi should have defined those names.
*/
_mesa_map_function_array(MESA_alt_functions);
}
/**
* Initialize the remap table. This is called in one_time_init().
* The remap table needs to be initialized before calling the
* CALL/GET/SET macros defined in glapi/dispatch.h.
*/
void
_mesa_init_remap_table(void)
{
static GLboolean initialized = GL_FALSE;
GLint i;
if (initialized)
return;
initialized = GL_TRUE;
/* initialize the remap table */
for (i = 0; i < ARRAY_SIZE(driDispatchRemapTable); i++) {
GLint offset;
const char *spec;
/* sanity check */
ASSERT(i == MESA_remap_table_functions[i].remap_index);
spec = _mesa_function_pool + MESA_remap_table_functions[i].pool_index;
offset = _mesa_map_function_spec(spec);
/* store the dispatch offset in the remap table */
driDispatchRemapTable[i] = offset;
if (offset < 0)
_mesa_warning(NULL, "failed to remap index %d", i);
}
}
#endif /* FEATURE_remap_table */
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