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
44 void
_glapi_noop_enable_warnings(unsigned char enable)45 _glapi_noop_enable_warnings(unsigned char enable)
46 {
47 }
48
49 void
_glapi_set_warning_func(_glapi_proc func)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 */
63 static int
Warn(const char * func)64 Warn(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 */
79 static GLint
NoOpUnused(void)80 NoOpUnused(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
103 static int
NoOpGeneric(void)104 NoOpGeneric(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