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SDL_hints.h
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/*
SDL - Simple DihintsMedia Layer
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Copyright (C) 1997-2011 Sam Lantinga
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This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
Sam Lantinga
slouken@libsdl.org
*/
/**
* \file SDL_hints.h
*
* Official documentation for SDL configuration variables
*
* This file contains functions to set and get configuration hints,
* as well as listing each of them alphabetically.
*
* The convention for naming hints is SDL_HINT_X, where "SDL_X" is
* the environment variable that can be used to override the default.
*
* In general these hints are just that - they may or may not be
* supported or applicable on any given platform, but they provide
* a way for an application or user to give the library a hint as
* to how they would like the library to work.
*/
#ifndef _SDL_hints_h
#define _SDL_hints_h
#include "SDL_stdinc.h"
#include "begin_code.h"
/* Set up for C function definitions, even when using C++ */
#ifdef __cplusplus
/* *INDENT-OFF* */
extern "C" {
/* *INDENT-ON* */
#endif
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/**
* \brief A variable controlling how 3D acceleration is used to accelerate the SDL 1.2 screen surface.
*
* SDL can try to accelerate the SDL 1.2 screen surface by using streaming
* textures with a 3D rendering engine. This variable controls whether and
* how this is done.
*
* This variable can be set to the following values:
* "0" - Disable 3D acceleration
* "1" - Enable 3D acceleration, using the default renderer.
* "X" - Enable 3D acceleration, using X where X is one of the valid rendering drivers. (e.g. "direct3d", "opengl", etc.)
*
* By default SDL tries to make a best guess for each platform whether
* to use acceleration or not.
*/
#define SDL_HINT_FRAMEBUFFER_ACCELERATION "SDL_FRAMEBUFFER_ACCELERATION"
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/**
* \brief A variable specifying which render driver to use.
*
* If the application doesn't pick a specific renderer to use, this variable
* specifies the name of the preferred renderer. If the preferred renderer
* can't be initialized, the normal default renderer is used.
*
* This variable is case insensitive and can be set to the following values:
* "direct3d"
* "opengl"
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* "opengles2"
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* "opengles"
* "software"
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*
* The default varies by platform, but it's the first one in the list that
* is available on the current platform.
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*/
#define SDL_HINT_RENDER_DRIVER "SDL_RENDER_DRIVER"
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/**
* \brief A variable controlling whether the OpenGL render driver uses shaders if they are available.
*
* This variable can be set to the following values:
* "0" - Disable shaders
* "1" - Enable shaders
*
* By default shaders are used if OpenGL supports them.
*/
#define SDL_HINT_RENDER_OPENGL_SHADERS "SDL_RENDER_OPENGL_SHADERS"
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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.
*
* This variable can be set to the following values:
* "0" - Disable vsync
* "1" - Enable vsync
*
* By default SDL does not sync screen surface updates with vertical refresh.
*/
#define SDL_HINT_RENDER_VSYNC "SDL_RENDER_VSYNC"
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/**
* \brief An enumeration of hint priorities
*/
typedef enum
{
SDL_HINT_DEFAULT,
SDL_HINT_NORMAL,
SDL_HINT_OVERRIDE
} SDL_HintPriority;
/**
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* \brief Set a hint with a specific priority
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*
* The priority controls the behavior when setting a hint that already
* has a value. Hints will replace existing hints of their priority and
* lower. Environment variables are considered to have override priority.
*
* \return SDL_TRUE if the hint was set, SDL_FALSE otherwise
*/
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extern DECLSPEC SDL_bool SDLCALL SDL_SetHintWithPriority(const char *name,
const char *value,
SDL_HintPriority priority);
/**
* \brief Set a hint with normal priority
*
* \return SDL_TRUE if the hint was set, SDL_FALSE otherwise
*/
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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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/**
* \brief Get a hint
*
* \return The string value of a hint variable.
*/
extern DECLSPEC const char * SDLCALL SDL_GetHint(const char *name);
/**
* \brief Clear all hints
*
* This function is called during SDL_Quit() to free stored hints.
*/
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extern DECLSPEC void SDLCALL SDL_ClearHints(void);
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/* Ends C function definitions when using C++ */
#ifdef __cplusplus
/* *INDENT-OFF* */
}
/* *INDENT-ON* */
#endif
#include "close_code.h"
#endif /* _SDL_hints_h */
/* vi: set ts=4 sw=4 expandtab: */