133 lines
3.5 KiB
C
133 lines
3.5 KiB
C
/*
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* Mesa 3-D graphics library
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*
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* Copyright (C) 1999-2008 Brian Paul All Rights Reserved.
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* Copyright (C) 2010 VMware, Inc. All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included
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* in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
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* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*/
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/**
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* No-op dispatch table.
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*
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* This file defines a special dispatch table which is loaded with no-op
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* functions.
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*
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* Mesa can register a "no-op handler function" which will be called in
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* the event that a no-op function is called.
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*
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* In the past, the dispatch table was loaded with pointers to a single
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* no-op function. But that broke on Windows because the GL entrypoints
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* use __stdcall convention. __stdcall means the callee cleans up the
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* stack. So one no-op function can't properly clean up the stack. This
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* would lead to crashes.
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*
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* Another benefit of unique no-op functions is we can accurately report
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* the function's name in an error message.
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*/
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#include <stdlib.h>
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#include <string.h>
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#include "glapi/glapi_priv.h"
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void
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_glapi_noop_enable_warnings(unsigned char enable)
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{
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}
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void
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_glapi_set_warning_func(_glapi_proc func)
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{
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}
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/**
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* We'll jump though this function pointer whenever a no-op function
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* is called.
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*/
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static _glapi_nop_handler_proc nop_handler = NULL;
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/**
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* Register the no-op handler call-back function.
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*/
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void
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_glapi_set_nop_handler(_glapi_nop_handler_proc func)
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{
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nop_handler = func;
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}
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/**
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* Called by each of the no-op GL entrypoints.
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*/
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static void
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nop(const char *func)
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{
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if (nop_handler)
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nop_handler(func);
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}
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/**
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* This is called if the user somehow calls an unassigned GL dispatch function.
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*/
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static GLint
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NoOpUnused(void)
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{
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nop("unused GL entry point");
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return 0;
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}
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/*
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* Defines for the glapitemp.h functions.
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*/
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#define KEYWORD1 static
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#define KEYWORD1_ALT static
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#define KEYWORD2 GLAPIENTRY
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#define NAME(func) NoOp##func
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#define DISPATCH(func, args, msg) nop(#func);
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#define RETURN_DISPATCH(func, args, msg) nop(#func); return 0
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/*
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* Defines for the table of no-op entry points.
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*/
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#define TABLE_ENTRY(name) (_glapi_proc) NoOp##name
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#define DISPATCH_TABLE_NAME __glapi_noop_table
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#define UNUSED_TABLE_NAME __unused_noop_functions
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#include "glapitemp.h"
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/** Return pointer to new dispatch table filled with no-op functions */
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struct _glapi_table *
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_glapi_new_nop_table(unsigned num_entries)
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{
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struct _glapi_table *table = malloc(num_entries * sizeof(_glapi_proc));
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if (table) {
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memcpy(table, __glapi_noop_table,
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num_entries * sizeof(_glapi_proc));
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}
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return table;
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}
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