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annotate include/SDL_hints.h @ 5230:5d01d426f2ea

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It's now possible to disable the fast atomic operations, at a huge performance penalty.
author Sam Lantinga <slouken@libsdl.org>
date Mon, 07 Feb 2011 22:57:33 -0800
parents 01bced9a4cc1
children ce4f91138031
rev   line source
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1 /*
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2 SDL - Simple DihintsMedia Layer
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3 Copyright (C) 1997-2010 Sam Lantinga
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4
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5 This library is free software; you can redistribute it and/or
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6 modify it under the terms of the GNU Lesser General Public
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7 License as published by the Free Software Foundation; either
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8 version 2.1 of the License, or (at your option) any later version.
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9
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10 This library is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 Lesser General Public License for more details.
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14
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15 You should have received a copy of the GNU Lesser General Public
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16 License along with this library; if not, write to the Free Software
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17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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18
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19 Sam Lantinga
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20 slouken@libsdl.org
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21 */
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22
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23 /**
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24 * \file SDL_hints.h
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25 *
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26 * Official documentation for SDL configuration variables
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27 *
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28 * This file contains functions to set and get configuration hints,
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29 * as well as listing each of them alphabetically.
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30 *
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31 * The convention for naming hints is SDL_HINT_X, where "SDL_X" is
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32 * the environment variable that can be used to override the default.
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33 *
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34 * In general these hints are just that - they may or may not be
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35 * supported or applicable on any given platform, but they provide
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36 * a way for an application or user to give the library a hint as
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37 * to how they would like the library to work.
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38 */
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39
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40 #ifndef _SDL_hints_h
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41 #define _SDL_hints_h
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42
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43 #include "SDL_stdinc.h"
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44
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45 #include "begin_code.h"
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46 /* Set up for C function definitions, even when using C++ */
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47 #ifdef __cplusplus
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48 /* *INDENT-OFF* */
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49 extern "C" {
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50 /* *INDENT-ON* */
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51 #endif
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52
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53 /**
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54 * \brief A variable controlling how 3D acceleration is used to accelerate the SDL 1.2 screen surface.
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55 *
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56 * SDL can try to accelerate the SDL 1.2 screen surface by using streaming
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57 * textures with a 3D rendering engine. This variable controls whether and
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58 * how this is done.
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59 *
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60 * This variable can be set to the following values:
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61 * "0" - Disable 3D acceleration
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62 * "1" - Enable 3D acceleration, using the default renderer.
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63 * "X" - Enable 3D acceleration, using X where X is one of the valid rendering drivers. (e.g. "direct3d", "opengl", etc.)
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64 *
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65 * By default SDL tries to make a best guess for each platform whether
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66 * to use acceleration or not.
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67 */
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68 #define SDL_HINT_FRAMEBUFFER_ACCELERATION "SDL_FRAMEBUFFER_ACCELERATION"
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69
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70 /**
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71 * \brief A variable specifying which render driver to use.
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72 *
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73 * If the application doesn't pick a specific renderer to use, this variable
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74 * specifies the name of the preferred renderer. If the preferred renderer
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75 * can't be initialized, the normal default renderer is used.
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76 *
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77 * This variable is case insensitive and can be set to the following values:
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78 * "direct3d"
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79 * "opengl"
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80 * "opengles"
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81 * "software"
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82 */
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83 #define SDL_HINT_RENDER_DRIVER "SDL_RENDER_DRIVER"
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84
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85 /**
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86 * \brief A variable controlling whether updates to the SDL 1.2 screen surface should be synchronized with the vertical refresh, to avoid tearing.
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87 *
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88 * This variable can be set to the following values:
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89 * "0" - Disable vsync
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90 * "1" - Enable vsync
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91 *
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92 * By default SDL does not sync screen surface updates with vertical refresh.
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93 */
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94 #define SDL_HINT_RENDER_VSYNC "SDL_RENDER_VSYNC"
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95
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96
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97 /**
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98 * \brief An enumeration of hint priorities
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99 */
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100 typedef enum
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101 {
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102 SDL_HINT_DEFAULT,
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103 SDL_HINT_NORMAL,
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104 SDL_HINT_OVERRIDE
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105 } SDL_HintPriority;
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106
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107
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108 /**
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109 * \brief Set a hint with a specific priority
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110 *
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111 * The priority controls the behavior when setting a hint that already
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112 * has a value. Hints will replace existing hints of their priority and
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113 * lower. Environment variables are considered to have override priority.
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114 *
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115 * \return SDL_TRUE if the hint was set, SDL_FALSE otherwise
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116 */
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117 extern DECLSPEC SDL_bool SDLCALL SDL_SetHintWithPriority(const char *name,
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118 const char *value,
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119 SDL_HintPriority priority);
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120
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121 /**
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122 * \brief Set a hint with normal priority
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123 *
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124 * \return SDL_TRUE if the hint was set, SDL_FALSE otherwise
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125 */
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126 extern DECLSPEC SDL_bool SDLCALL SDL_SetHint(const char *name,
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127 const char *value);
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128
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129
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130 /**
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131 * \brief Get a hint
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132 *
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133 * \return The string value of a hint variable.
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134 */
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135 extern DECLSPEC const char * SDLCALL SDL_GetHint(const char *name);
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136
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137 /**
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138 * \brief Clear all hints
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139 *
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140 * This function is called during SDL_Quit() to free stored hints.
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141 */
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142 extern DECLSPEC void SDLCALL SDL_ClearHints();
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143
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144
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145 /* Ends C function definitions when using C++ */
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146 #ifdef __cplusplus
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147 /* *INDENT-OFF* */
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148 }
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149 /* *INDENT-ON* */
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150 #endif
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151 #include "close_code.h"
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152
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153 #endif /* _SDL_hints_h */
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154
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155 /* vi: set ts=4 sw=4 expandtab: */