src/mapi/glapi/glapi_nop.c

   1 /*
   2  * Mesa 3-D graphics library
   3  *
   4  * Copyright (C) 1999-2008  Brian Paul   All Rights Reserved.
   5  * Copyright (C) 2010  VMware, Inc.  All Rights Reserved.
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a
   8  * copy of this software and associated documentation files (the "Software"),
   9  * to deal in the Software without restriction, including without limitation
  10  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  11  * and/or sell copies of the Software, and to permit persons to whom the
  12  * Software is furnished to do so, subject to the following conditions:
  13  *
  14  * The above copyright notice and this permission notice shall be included
  15  * in all copies or substantial portions of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  18  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  20  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
  21  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  22  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  23  * 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
  45 _glapi_noop_enable_warnings(unsigned char enable)
  46 {
  47 }
  48
  49 void
  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
  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
  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
 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"