include/SDL_hints.h
author Sam Lantinga <slouken@libsdl.org>
Sat, 06 Jul 2013 00:15:01 -0700
changeset 7353 80e081e7538d
parent 7328 bbfc72c803df
child 7432 58908b180ebd
permissions -rw-r--r--
Fixed mingw32 build
     1 /*
     2   Simple DirectMedia Layer
     3   Copyright (C) 1997-2013 Sam Lantinga <slouken@libsdl.org>
     4 
     5   This software is provided 'as-is', without any express or implied
     6   warranty.  In no event will the authors be held liable for any damages
     7   arising from the use of this software.
     8 
     9   Permission is granted to anyone to use this software for any purpose,
    10   including commercial applications, and to alter it and redistribute it
    11   freely, subject to the following restrictions:
    12 
    13   1. The origin of this software must not be misrepresented; you must not
    14      claim that you wrote the original software. If you use this software
    15      in a product, an acknowledgment in the product documentation would be
    16      appreciated but is not required.
    17   2. Altered source versions must be plainly marked as such, and must not be
    18      misrepresented as being the original software.
    19   3. This notice may not be removed or altered from any source distribution.
    20 */
    21 
    22 /**
    23  *  \file SDL_hints.h
    24  *
    25  *  Official documentation for SDL configuration variables
    26  *
    27  *  This file contains functions to set and get configuration hints,
    28  *  as well as listing each of them alphabetically.
    29  *
    30  *  The convention for naming hints is SDL_HINT_X, where "SDL_X" is
    31  *  the environment variable that can be used to override the default.
    32  *
    33  *  In general these hints are just that - they may or may not be
    34  *  supported or applicable on any given platform, but they provide
    35  *  a way for an application or user to give the library a hint as
    36  *  to how they would like the library to work.
    37  */
    38 
    39 #ifndef _SDL_hints_h
    40 #define _SDL_hints_h
    41 
    42 #include "SDL_stdinc.h"
    43 
    44 #include "begin_code.h"
    45 /* Set up for C function definitions, even when using C++ */
    46 #ifdef __cplusplus
    47 extern "C" {
    48 #endif
    49 
    50 /**
    51  *  \brief  A variable controlling how 3D acceleration is used to accelerate the SDL screen surface.
    52  *
    53  *  SDL can try to accelerate the SDL screen surface by using streaming
    54  *  textures with a 3D rendering engine.  This variable controls whether and
    55  *  how this is done.
    56  *
    57  *  This variable can be set to the following values:
    58  *    "0"       - Disable 3D acceleration
    59  *    "1"       - Enable 3D acceleration, using the default renderer.
    60  *    "X"       - Enable 3D acceleration, using X where X is one of the valid rendering drivers.  (e.g. "direct3d", "opengl", etc.)
    61  *
    62  *  By default SDL tries to make a best guess for each platform whether
    63  *  to use acceleration or not.
    64  */
    65 #define SDL_HINT_FRAMEBUFFER_ACCELERATION   "SDL_FRAMEBUFFER_ACCELERATION"
    66 
    67 /**
    68  *  \brief  A variable specifying which render driver to use.
    69  *
    70  *  If the application doesn't pick a specific renderer to use, this variable
    71  *  specifies the name of the preferred renderer.  If the preferred renderer
    72  *  can't be initialized, the normal default renderer is used.
    73  *
    74  *  This variable is case insensitive and can be set to the following values:
    75  *    "direct3d"
    76  *    "opengl"
    77  *    "opengles2"
    78  *    "opengles"
    79  *    "software"
    80  *
    81  *  The default varies by platform, but it's the first one in the list that
    82  *  is available on the current platform.
    83  */
    84 #define SDL_HINT_RENDER_DRIVER              "SDL_RENDER_DRIVER"
    85 
    86 /**
    87  *  \brief  A variable controlling whether the OpenGL render driver uses shaders if they are available.
    88  *
    89  *  This variable can be set to the following values:
    90  *    "0"       - Disable shaders
    91  *    "1"       - Enable shaders
    92  *
    93  *  By default shaders are used if OpenGL supports them.
    94  */
    95 #define SDL_HINT_RENDER_OPENGL_SHADERS      "SDL_RENDER_OPENGL_SHADERS"
    96 
    97 /**
    98  *  \brief  A variable controlling the scaling quality
    99  *
   100  *  This variable can be set to the following values:
   101  *    "0" or "nearest" - Nearest pixel sampling
   102  *    "1" or "linear"  - Linear filtering (supported by OpenGL and Direct3D)
   103  *    "2" or "best"    - Anisotropic filtering (supported by Direct3D)
   104  *
   105  *  By default nearest pixel sampling is used
   106  */
   107 #define SDL_HINT_RENDER_SCALE_QUALITY       "SDL_RENDER_SCALE_QUALITY"
   108 
   109 /**
   110  *  \brief  A variable controlling whether updates to the SDL screen surface should be synchronized with the vertical refresh, to avoid tearing.
   111  *
   112  *  This variable can be set to the following values:
   113  *    "0"       - Disable vsync
   114  *    "1"       - Enable vsync
   115  *
   116  *  By default SDL does not sync screen surface updates with vertical refresh.
   117  */
   118 #define SDL_HINT_RENDER_VSYNC               "SDL_RENDER_VSYNC"
   119 
   120 /**
   121  *  \brief  A variable controlling whether the X11 VidMode extension should be used.
   122  *
   123  *  This variable can be set to the following values:
   124  *    "0"       - Disable XVidMode
   125  *    "1"       - Enable XVidMode
   126  *
   127  *  By default SDL will use XVidMode if it is available.
   128  */
   129 #define SDL_HINT_VIDEO_X11_XVIDMODE         "SDL_VIDEO_X11_XVIDMODE"
   130 
   131 /**
   132  *  \brief  A variable controlling whether the X11 Xinerama extension should be used.
   133  *
   134  *  This variable can be set to the following values:
   135  *    "0"       - Disable Xinerama
   136  *    "1"       - Enable Xinerama
   137  *
   138  *  By default SDL will use Xinerama if it is available.
   139  */
   140 #define SDL_HINT_VIDEO_X11_XINERAMA         "SDL_VIDEO_X11_XINERAMA"
   141 
   142 /**
   143  *  \brief  A variable controlling whether the X11 XRandR extension should be used.
   144  *
   145  *  This variable can be set to the following values:
   146  *    "0"       - Disable XRandR
   147  *    "1"       - Enable XRandR
   148  *
   149  *  By default SDL will not use XRandR because of window manager issues.
   150  */
   151 #define SDL_HINT_VIDEO_X11_XRANDR           "SDL_VIDEO_X11_XRANDR"
   152 
   153 /**
   154  *  \brief  A variable controlling whether grabbing input grabs the keyboard
   155  *
   156  *  This variable can be set to the following values:
   157  *    "0"       - Grab will affect only the mouse
   158  *    "1"       - Grab will affect mouse and keyboard
   159  *
   160  *  By default SDL will not grab the keyboard so system shortcuts still work.
   161  */
   162 #define SDL_HINT_GRAB_KEYBOARD              "SDL_GRAB_KEYBOARD"
   163 
   164 /**
   165  *  \brief Minimize your SDL_Window if it loses key focus when in Fullscreen mode. Defaults to true.
   166  *
   167  */
   168 #define SDL_HINT_VIDEO_MINIMIZE_ON_FOCUS_LOSS   "SDL_VIDEO_MINIMIZE_ON_FOCUS_LOSS"
   169 
   170 
   171 /**
   172  *  \brief  A variable controlling whether the idle timer is disabled on iOS.
   173  *
   174  *  When an iOS app does not receive touches for some time, the screen is
   175  *  dimmed automatically. For games where the accelerometer is the only input
   176  *  this is problematic. This functionality can be disabled by setting this
   177  *  hint.
   178  *
   179  *  This variable can be set to the following values:
   180  *    "0"       - Enable idle timer
   181  *    "1"       - Disable idle timer
   182  */
   183 #define SDL_HINT_IDLE_TIMER_DISABLED "SDL_IOS_IDLE_TIMER_DISABLED"
   184 
   185 /**
   186  *  \brief  A variable controlling which orientations are allowed on iOS.
   187  *
   188  *  In some circumstances it is necessary to be able to explicitly control
   189  *  which UI orientations are allowed.
   190  *
   191  *  This variable is a space delimited list of the following values:
   192  *    "LandscapeLeft", "LandscapeRight", "Portrait" "PortraitUpsideDown"
   193  */
   194 #define SDL_HINT_ORIENTATIONS "SDL_IOS_ORIENTATIONS"
   195 
   196 
   197 /**
   198  *  \brief  A variable that lets you disable the detection and use of Xinput gamepad devices
   199  *
   200  *  The variable can be set to the following values:
   201  *    "0"       - Disable XInput timer (only uses direct input)
   202  *    "1"       - Enable XInput timer (the default)
   203  */
   204 #define SDL_HINT_XINPUT_ENABLED "SDL_XINPUT_ENABLED"
   205 
   206 
   207 /**
   208  *  \brief  A variable that lets you manually hint extra gamecontroller db entries
   209  *
   210  *  The variable should be newline delimited rows of gamecontroller config data, see SDL_gamecontroller.h
   211  *
   212  *  This hint must be set before calling SDL_Init(SDL_INIT_GAMECONTROLLER)
   213  *  You can update mappings after the system is initialized with SDL_GameControllerMappingForGUID() and SDL_GameControllerAddMapping()
   214  */
   215 #define SDL_HINT_GAMECONTROLLERCONFIG "SDL_GAMECONTROLLERCONFIG"
   216 
   217 
   218 /**
   219  *  \brief  A variable that lets you enable joystick (and gamecontroller) events even when your app is in the background.
   220  *
   221  * The default value is "0".
   222  *
   223  *  The variable can be set to the following values:
   224  *    "0"       - Disable joystick & gamecontroller input events when the
   225  *                application is in the background.
   226  *    "1"       - Enable joystick & gamecontroller input events when the
   227  *                application is in the backgroumd.
   228  */
   229 #define SDL_HINT_JOYSTICK_ALLOW_BACKGROUND_EVENTS "SDL_JOYSTICK_ALLOW_BACKGROUND_EVENTS"
   230 
   231 
   232 /**
   233  *  \brief If set to 0 then never set the top most bit on a SDL Window, even if the video mode expects it.
   234  *      This is a debugging aid for developers and not expected to be used by end users. The default is "1"
   235  *
   236  *  This variable can be set to the following values:
   237  *    "0"       - don't allow topmost
   238  *    "1"       - allow topmost
   239  */
   240 #define SDL_HINT_ALLOW_TOPMOST "SDL_ALLOW_TOPMOST"
   241 
   242 
   243 
   244 /**
   245  *  \brief  An enumeration of hint priorities
   246  */
   247 typedef enum
   248 {
   249     SDL_HINT_DEFAULT,
   250     SDL_HINT_NORMAL,
   251     SDL_HINT_OVERRIDE
   252 } SDL_HintPriority;
   253 
   254 
   255 /**
   256  *  \brief Set a hint with a specific priority
   257  *
   258  *  The priority controls the behavior when setting a hint that already
   259  *  has a value.  Hints will replace existing hints of their priority and
   260  *  lower.  Environment variables are considered to have override priority.
   261  *
   262  *  \return SDL_TRUE if the hint was set, SDL_FALSE otherwise
   263  */
   264 extern DECLSPEC SDL_bool SDLCALL SDL_SetHintWithPriority(const char *name,
   265                                                          const char *value,
   266                                                          SDL_HintPriority priority);
   267 
   268 /**
   269  *  \brief Set a hint with normal priority
   270  *
   271  *  \return SDL_TRUE if the hint was set, SDL_FALSE otherwise
   272  */
   273 extern DECLSPEC SDL_bool SDLCALL SDL_SetHint(const char *name,
   274                                              const char *value);
   275 
   276 
   277 /**
   278  *  \brief Get a hint
   279  *
   280  *  \return The string value of a hint variable.
   281  */
   282 extern DECLSPEC const char * SDLCALL SDL_GetHint(const char *name);
   283 
   284 /**
   285  *  \brief  Clear all hints
   286  *
   287  *  This function is called during SDL_Quit() to free stored hints.
   288  */
   289 extern DECLSPEC void SDLCALL SDL_ClearHints(void);
   290 
   291 
   292 /* Ends C function definitions when using C++ */
   293 #ifdef __cplusplus
   294 }
   295 #endif
   296 #include "close_code.h"
   297 
   298 #endif /* _SDL_hints_h */
   299 
   300 /* vi: set ts=4 sw=4 expandtab: */