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  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"
  122.