include/SDL_hints.h
author Sam Lantinga <slouken@libsdl.org>
Thu, 27 Sep 2012 11:29:13 -0700
changeset 6472 d4623b7209db
parent 6138 4c64952a58fb
child 6558 90f231aa77b9
permissions -rw-r--r--
Turned the X11 mode extension environment variables into hints so they can be more easily set from applications.
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/*
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  Simple DirectMedia Layer
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  Copyright (C) 1997-2012 Sam Lantinga <slouken@libsdl.org>
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  This software is provided 'as-is', without any express or implied
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  warranty.  In no event will the authors be held liable for any damages
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  arising from the use of this software.
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  Permission is granted to anyone to use this software for any purpose,
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  including commercial applications, and to alter it and redistribute it
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  freely, subject to the following restrictions:
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  1. The origin of this software must not be misrepresented; you must not
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     claim that you wrote the original software. If you use this software
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     in a product, an acknowledgment in the product documentation would be
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     appreciated but is not required.
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  2. Altered source versions must be plainly marked as such, and must not be
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     misrepresented as being the original software.
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  3. This notice may not be removed or altered from any source distribution.
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*/
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/**
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 *  \file SDL_hints.h
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 *  
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 *  Official documentation for SDL configuration variables
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 *
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 *  This file contains functions to set and get configuration hints,
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 *  as well as listing each of them alphabetically.
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 *
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 *  The convention for naming hints is SDL_HINT_X, where "SDL_X" is
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 *  the environment variable that can be used to override the default.
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 *
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 *  In general these hints are just that - they may or may not be
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 *  supported or applicable on any given platform, but they provide
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 *  a way for an application or user to give the library a hint as
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 *  to how they would like the library to work.
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 */
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#ifndef _SDL_hints_h
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#define _SDL_hints_h
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#include "SDL_stdinc.h"
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#include "begin_code.h"
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/* Set up for C function definitions, even when using C++ */
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#ifdef __cplusplus
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/* *INDENT-OFF* */
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extern "C" {
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/* *INDENT-ON* */
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#endif
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/**
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 *  \brief  A variable controlling how 3D acceleration is used to accelerate the SDL 1.2 screen surface. 
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 *
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 *  SDL can try to accelerate the SDL 1.2 screen surface by using streaming
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 *  textures with a 3D rendering engine.  This variable controls whether and
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 *  how this is done.
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 *
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 *  This variable can be set to the following values:
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 *    "0"       - Disable 3D acceleration
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 *    "1"       - Enable 3D acceleration, using the default renderer.
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 *    "X"       - Enable 3D acceleration, using X where X is one of the valid rendering drivers.  (e.g. "direct3d", "opengl", etc.)
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 *
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 *  By default SDL tries to make a best guess for each platform whether
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 *  to use acceleration or not.
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 */
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#define SDL_HINT_FRAMEBUFFER_ACCELERATION   "SDL_FRAMEBUFFER_ACCELERATION"
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/**
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 *  \brief  A variable specifying which render driver to use.
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 *
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 *  If the application doesn't pick a specific renderer to use, this variable
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 *  specifies the name of the preferred renderer.  If the preferred renderer
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 *  can't be initialized, the normal default renderer is used.
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 *
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 *  This variable is case insensitive and can be set to the following values:
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 *    "direct3d"
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 *    "opengl"
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 *    "opengles2"
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 *    "opengles"
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 *    "software"
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 *
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 *  The default varies by platform, but it's the first one in the list that
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 *  is available on the current platform.
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 */
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#define SDL_HINT_RENDER_DRIVER              "SDL_RENDER_DRIVER"
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/**
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 *  \brief  A variable controlling whether the OpenGL render driver uses shaders if they are available.
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 *
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 *  This variable can be set to the following values:
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 *    "0"       - Disable shaders
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 *    "1"       - Enable shaders
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 *
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 *  By default shaders are used if OpenGL supports them.
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 */
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#define SDL_HINT_RENDER_OPENGL_SHADERS      "SDL_RENDER_OPENGL_SHADERS"
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/**
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 *  \brief  A variable controlling the scaling quality
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 *
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 *  This variable can be set to the following values:
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 *    "0" or "nearest" - Nearest pixel sampling
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 *    "1" or "linear"  - Linear filtering (supported by OpenGL and Direct3D)
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 *    "2" or "best"    - Anisotropic filtering (supported by Direct3D)
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 *
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 *  By default nearest pixel sampling is used
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 */
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#define SDL_HINT_RENDER_SCALE_QUALITY       "SDL_RENDER_SCALE_QUALITY"
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/**
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 *  \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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 *
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 *  This variable can be set to the following values:
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 *    "0"       - Disable vsync
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 *    "1"       - Enable vsync
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 *
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 *  By default SDL does not sync screen surface updates with vertical refresh.
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 */
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#define SDL_HINT_RENDER_VSYNC               "SDL_RENDER_VSYNC"
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/**
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 *  \brief  A variable controlling whether the X11 VidMode extension should be used.
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 *
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 *  This variable can be set to the following values:
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 *    "0"       - Disable XVidMode
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 *    "1"       - Enable XVidMode
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 *
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 *  By default SDL will use XVidMode if it is available.
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 */
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#define SDL_HINT_VIDEO_X11_XVIDMODE         "SDL_VIDEO_X11_XVIDMODE"
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/**
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 *  \brief  A variable controlling whether the X11 Xinerama extension should be used.
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 *
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 *  This variable can be set to the following values:
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 *    "0"       - Disable Xinerama
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 *    "1"       - Enable Xinerama
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 *
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 *  By default SDL will use Xinerama if it is available.
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 */
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#define SDL_HINT_VIDEO_X11_XINERAMA         "SDL_VIDEO_X11_XINERAMA"
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/**
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 *  \brief  A variable controlling whether the X11 XRandR extension should be used.
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 *
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 *  This variable can be set to the following values:
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 *    "0"       - Disable XRandR
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 *    "1"       - Enable XRandR
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 *
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 *  By default SDL will use XRandR if it is available.
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 */
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#define SDL_HINT_VIDEO_X11_XRANDR           "SDL_VIDEO_X11_XRANDR"
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/**
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 *  \brief  A variable controlling whether the idle timer is disabled on iOS.
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 *
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 *  When an iOS app does not receive touches for some time, the screen is
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 *  dimmed automatically. For games where the accelerometer is the only input
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 *  this is problematic. This functionality can be disabled by setting this
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 *  hint.
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 *
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 *  This variable can be set to the following values:
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 *    "0"       - Enable idle timer
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 *    "1"       - Disable idle timer
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 */
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#define SDL_HINT_IDLE_TIMER_DISABLED "SDL_IOS_IDLE_TIMER_DISABLED"
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/**
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 *  \brief  A variable controlling which orientations are allowed on iOS.
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 *
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 *  In some circumstances it is necessary to be able to explicitly control
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 *  which UI orientations are allowed.
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 *
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 *  This variable is a space delimited list of the following values:
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 *    "LandscapeLeft", "LandscapeRight", "Portrait" "PortraitUpsideDown"
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 */
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#define SDL_HINT_ORIENTATIONS "SDL_IOS_ORIENTATIONS"
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/**
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 *  \brief  An enumeration of hint priorities
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 */
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typedef enum
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{
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    SDL_HINT_DEFAULT,
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    SDL_HINT_NORMAL,
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    SDL_HINT_OVERRIDE
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} SDL_HintPriority;
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/**
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 *  \brief Set a hint with a specific priority
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 *
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 *  The priority controls the behavior when setting a hint that already
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 *  has a value.  Hints will replace existing hints of their priority and
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 *  lower.  Environment variables are considered to have override priority.
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 * 
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 *  \return SDL_TRUE if the hint was set, SDL_FALSE otherwise
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 */
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extern DECLSPEC SDL_bool SDLCALL SDL_SetHintWithPriority(const char *name,
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                                                         const char *value,
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                                                         SDL_HintPriority priority);
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/**
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 *  \brief Set a hint with normal priority
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 * 
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 *  \return SDL_TRUE if the hint was set, SDL_FALSE otherwise
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 */
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extern DECLSPEC SDL_bool SDLCALL SDL_SetHint(const char *name,
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                                             const char *value);
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/**
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 *  \brief Get a hint
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 *  
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 *  \return The string value of a hint variable.
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 */
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extern DECLSPEC const char * SDLCALL SDL_GetHint(const char *name);
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/**
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 *  \brief  Clear all hints
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 *
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 *  This function is called during SDL_Quit() to free stored hints.
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 */
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extern DECLSPEC void SDLCALL SDL_ClearHints(void);
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/* Ends C function definitions when using C++ */
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#ifdef __cplusplus
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/* *INDENT-OFF* */
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}
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/* *INDENT-ON* */
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#endif
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#include "close_code.h"
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#endif /* _SDL_hints_h */
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/* vi: set ts=4 sw=4 expandtab: */