1/*
2 * Mesa 3-D graphics library
3 * Version:  7.8
4 *
5 * Copyright (C) 1999-2008  Brian Paul   All Rights Reserved.
6 * Copyright (C) 2010  VMware, Inc.  All Rights Reserved.
7 *
8 * Permission is hereby granted, free of charge, to any person obtaining a
9 * copy of this software and associated documentation files (the "Software"),
10 * to deal in the Software without restriction, including without limitation
11 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
12 * and/or sell copies of the Software, and to permit persons to whom the
13 * Software is furnished to do so, subject to the following conditions:
14 *
15 * The above copyright notice and this permission notice shall be included
16 * in all copies or substantial portions of the Software.
17 *
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
19 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
20 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
21 * THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
22 * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
23 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
24 */
25
26
27/**
28 * No-op dispatch table.
29 *
30 * This file defines a special dispatch table which is loaded with no-op
31 * functions.
32 *
33 * When there's no current rendering context, calling a GL function like
34 * glBegin() is a no-op.  Apps should never normally do this.  So as a
35 * debugging aid, each of the no-op functions will emit a warning to
36 * stderr if the MESA_DEBUG or LIBGL_DEBUG env var is set.
37 */
38
39
40
41#include "glapi/glapi_priv.h"
42
43
44void
45_glapi_noop_enable_warnings(unsigned char enable)
46{
47}
48
49void
50_glapi_set_warning_func(_glapi_proc func)
51{
52}
53
54/*
55 * When GLAPIENTRY is __stdcall (i.e. Windows), the stack is popped by the
56 * callee making the number/type of arguments significant.
57 */
58#if defined(_WIN32) || defined(DEBUG)
59
60/**
61 * Called by each of the no-op GL entrypoints.
62 */
63static int
64Warn(const char *func)
65{
66#if defined(DEBUG) && !defined(_WIN32_WCE)
67   if (getenv("MESA_DEBUG") || getenv("LIBGL_DEBUG")) {
68      fprintf(stderr, "GL User Error: gl%s called without a rendering context\n",
69              func);
70   }
71#endif
72   return 0;
73}
74
75
76/**
77 * This is called if the user somehow calls an unassigned GL dispatch function.
78 */
79static GLint
80NoOpUnused(void)
81{
82   return Warn(" function");
83}
84
85/*
86 * Defines for the glapitemp.h functions.
87 */
88#define KEYWORD1 static
89#define KEYWORD1_ALT static
90#define KEYWORD2 GLAPIENTRY
91#define NAME(func)  NoOp##func
92#define DISPATCH(func, args, msg)  Warn(#func);
93#define RETURN_DISPATCH(func, args, msg)  Warn(#func); return 0
94
95
96/*
97 * Defines for the table of no-op entry points.
98 */
99#define TABLE_ENTRY(name) (_glapi_proc) NoOp##name
100
101#else
102
103static int
104NoOpGeneric(void)
105{
106#if !defined(_WIN32_WCE)
107   if (getenv("MESA_DEBUG") || getenv("LIBGL_DEBUG")) {
108      fprintf(stderr, "GL User Error: calling GL function without a rendering context\n");
109   }
110#endif
111   return 0;
112}
113
114#define TABLE_ENTRY(name) (_glapi_proc) NoOpGeneric
115
116#endif
117
118#define DISPATCH_TABLE_NAME __glapi_noop_table
119#define UNUSED_TABLE_NAME __unused_noop_functions
120
121#include "glapi/glapitemp.h"
122