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annotate include/SDL_hints.h @ 5275:7aba0406c273

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Frank Zago to sdl The following patch fixes some of the bitrot for the Nintendo DS port. The support is still basic at the moment, but it allows to run the "general" test under the current head of tree (parent: 5269:11bd1585efb5 tip). Most of the patch is mine, but I integrated a couple changes that John Magnotti posted on Feb 1st.
author Sam Lantinga <slouken@libsdl.org>
date Sat, 12 Feb 2011 11:36:56 -0800
parents b530ef003506
children 3c94c559f5c2
rev   line source
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1 /*
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2 SDL - Simple DihintsMedia Layer
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b530ef003506 Happy 2011! :)
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3 Copyright (C) 1997-2011 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 * "opengles2"
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81 * "opengles"
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82 * "software"
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83 *
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84 * The default varies by platform, but it's the first one in the list that
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85 * is available on the current platform.
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86 */
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87 #define SDL_HINT_RENDER_DRIVER "SDL_RENDER_DRIVER"
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88
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89 /**
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90 * \brief A variable controlling whether the OpenGL render driver uses shaders if they are available.
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91 *
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92 * This variable can be set to the following values:
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93 * "0" - Disable shaders
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94 * "1" - Enable shaders
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95 *
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96 * By default shaders are used if OpenGL supports them.
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97 */
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98 #define SDL_HINT_RENDER_OPENGL_SHADERS "SDL_RENDER_OPENGL_SHADERS"
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99
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100 /**
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101 * \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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102 *
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103 * This variable can be set to the following values:
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104 * "0" - Disable vsync
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105 * "1" - Enable vsync
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106 *
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107 * By default SDL does not sync screen surface updates with vertical refresh.
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108 */
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109 #define SDL_HINT_RENDER_VSYNC "SDL_RENDER_VSYNC"
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110
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111
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112 /**
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113 * \brief An enumeration of hint priorities
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114 */
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115 typedef enum
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116 {
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117 SDL_HINT_DEFAULT,
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118 SDL_HINT_NORMAL,
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119 SDL_HINT_OVERRIDE
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120 } SDL_HintPriority;
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121
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122
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123 /**
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124 * \brief Set a hint with a specific priority
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125 *
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126 * The priority controls the behavior when setting a hint that already
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127 * has a value. Hints will replace existing hints of their priority and
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128 * lower. Environment variables are considered to have override priority.
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129 *
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130 * \return SDL_TRUE if the hint was set, SDL_FALSE otherwise
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131 */
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132 extern DECLSPEC SDL_bool SDLCALL SDL_SetHintWithPriority(const char *name,
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133 const char *value,
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134 SDL_HintPriority priority);
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135
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136 /**
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137 * \brief Set a hint with normal priority
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138 *
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139 * \return SDL_TRUE if the hint was set, SDL_FALSE otherwise
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140 */
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141 extern DECLSPEC SDL_bool SDLCALL SDL_SetHint(const char *name,
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142 const char *value);
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143
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144
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145 /**
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146 * \brief Get a hint
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147 *
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148 * \return The string value of a hint variable.
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149 */
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150 extern DECLSPEC const char * SDLCALL SDL_GetHint(const char *name);
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151
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152 /**
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153 * \brief Clear all hints
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154 *
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155 * This function is called during SDL_Quit() to free stored hints.
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156 */
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157 extern DECLSPEC void SDLCALL SDL_ClearHints();
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158
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159
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160 /* Ends C function definitions when using C++ */
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161 #ifdef __cplusplus
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162 /* *INDENT-OFF* */
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163 }
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164 /* *INDENT-ON* */
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165 #endif
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166 #include "close_code.h"
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167
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168 #endif /* _SDL_hints_h */
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169
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170 /* vi: set ts=4 sw=4 expandtab: */