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/*
* Mesa 3-D graphics library
*
* Copyright (C) 1999-2008 Brian Paul All Rights Reserved.
* Copyright (C) 2010 VMware, Inc. All Rights Reserved.
*
* 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.
*/
/**
* No-op dispatch table.
*
* This file defines a special dispatch table which is loaded with no-op
* functions.
*
* Mesa can register a "no-op handler function" which will be called in
* the event that a no-op function is called.
*
* In the past, the dispatch table was loaded with pointers to a single
* no-op function. But that broke on Windows because the GL entrypoints
* use __stdcall convention. __stdcall means the callee cleans up the
* stack. So one no-op function can't properly clean up the stack. This
* would lead to crashes.
*
* Another benefit of unique no-op functions is we can accurately report
* the function's name in an error message.
*/
#include <stdlib.h>
#include <string.h>
#include "glapi/glapi_priv.h"
#undef _GLAPI_EXPORT
#define _GLAPI_EXPORT
void _GLAPI_EXPORT
_glapi_noop_enable_warnings(unsigned char enable)
{
}
void _GLAPI_EXPORT
_glapi_set_warning_func(_glapi_proc func)
{
}
/**
* We'll jump though this function pointer whenever a no-op function
* is called.
*/
static _glapi_nop_handler_proc nop_handler = NULL;
/**
* Register the no-op handler call-back function.
*/
_GLAPI_EXPORT void
_glapi_set_nop_handler(_glapi_nop_handler_proc func)
{
nop_handler = func;
}
/**
* Called by each of the no-op GL entrypoints.
*/
static void
nop(const char *func)
{
if (nop_handler)
nop_handler(func);
}
/**
* This is called if the user somehow calls an unassigned GL dispatch function.
*/
static GLint
NoOpUnused(void)
{
nop("unused GL entry point");
return 0;
}
/*
* Defines for the glapitemp.h functions.
*/
#define KEYWORD1 static
#define KEYWORD1_ALT static
#define KEYWORD2 GLAPIENTRY
#define NAME(func) NoOp##func
#define DISPATCH(func, args, msg) nop(#func);
#define RETURN_DISPATCH(func, args, msg) nop(#func); return 0
/*
* Defines for the table of no-op entry points.
*/
#define TABLE_ENTRY(name) (_glapi_proc) NoOp##name
#define DISPATCH_TABLE_NAME __glapi_noop_table
#define UNUSED_TABLE_NAME __unused_noop_functions
#include "glapi/gen/glapitemp.h"
/** Return pointer to new dispatch table filled with no-op functions */
struct _glapi_table * _GLAPI_EXPORT
_glapi_new_nop_table(unsigned num_entries)
{
struct _glapi_table *table = malloc(num_entries * sizeof(_glapi_proc));
if (table) {
memcpy(table, __glapi_noop_table,
num_entries * sizeof(_glapi_proc));
}
return table;
}
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