src/mesa/glapi/glapi_nop.c

   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 #ifdef HAVE_DIX_CONFIG_H
  42 #include <dix-config.h>
  43 #include "glapi/mesa.h"
  44 #else
  45 #include "main/compiler.h"
  46 #include "main/glheader.h"
  47 #endif
  48
  49 #include "glapi/glapi.h"
  50
  51 #ifdef DEBUG
  52
  53 /**
  54  * Called by each of the no-op GL entrypoints.
  55  */
  56 static int
  57 Warn(const char *func)
  58 {
  59 #if !defined(_WIN32_WCE)
  60    if (getenv("MESA_DEBUG") || getenv("LIBGL_DEBUG")) {
  61       fprintf(stderr, "GL User Error: gl%s called without a rendering context\n",
  62               func);
  63    }
  64 #endif
  65    return 0;
  66 }
  67
  68
  69 /**
  70  * This is called if the user somehow calls an unassigned GL dispatch function.
  71  */
  72 static GLint
  73 NoOpUnused(void)
  74 {
  75    return Warn(" function");
  76 }
  77
  78 /*
  79  * Defines for the glapitemp.h functions.
  80  */
  81 #define KEYWORD1 static
  82 #define KEYWORD1_ALT static
  83 #define KEYWORD2 GLAPIENTRY
  84 #define NAME(func)  NoOp##func
  85 #define DISPATCH(func, args, msg)  Warn(#func);
  86 #define RETURN_DISPATCH(func, args, msg)  Warn(#func); return 0
  87
  88
  89 /*
  90  * Defines for the table of no-op entry points.
  91  */
  92 #define TABLE_ENTRY(name) (_glapi_proc) NoOp##name
  93
  94 #else
  95
  96 static void
  97 NoOpGeneric(void)
  98 {
  99 #if !defined(_WIN32_WCE)
 100    if (getenv("MESA_DEBUG") || getenv("LIBGL_DEBUG")) {
 101       fprintf(stderr, "GL User Error: calling GL function without a rendering context\n");
 102    }
 103 #endif
 104 }
 105
 106 #define TABLE_ENTRY(name) (_glapi_proc) NoOpGeneric
 107
 108 #endif
 109
 110 #define DISPATCH_TABLE_NAME __glapi_noop_table
 111 #define UNUSED_TABLE_NAME __unused_noop_functions
 112
 113 #include "glapi/glapitemp.h"