Mercurial > sdl-ios-xcode
annotate src/video/SDL_sysvideo.h @ 4139:568c9b3c0167 SDL-1.2
* Added configure option --enable-screensaver, to allow enabling the screensaver by default.
* Use XResetScreenSaver() instead of disabling screensaver entirely.
Full discussion summary from Erik on the SDL mailing list:
Current behaviour
=================
SDL changes the user's display power management settings without
permission from the user and without telling the user.
The interface that it uses to do so is DPMSDisable/DPMSEnable, which
should only ever be used by configuration utilities like KControl, never
by normal application programs, let alone by the libraries that they
use. Using an interface that is not at all intended for what SDL tries
to achieve means that it will not work as it should. Firstly, the power
management is completely disabled during the whole lifetime of the SDL
program, not only when it should be. Secondly, it makes SDL
non-reentrant, meaning that things will break when multiple SDL programs
are clients of the same X server simultaneously. Thirdly, no cleanup
mechanism ensures that the setting is restored if the client does not do
that (for example if it crashes).
In addition to that, this interface is broken on xorg,
[http://bugs.freedesktop.org/show_bug.cgi?id=13962], so what SDL tries
to do does not work at all on that implementation of the X Window
System. (The reason that the DPMSEnable works in KControl is that it
calls DPMSSetTimeout immediately after,
[http://websvn.kde.org/tags/KDE/3.5.9/kdebase/kcontrol/energy/energy.cpp?annotate=774532#l343]).
The problems that the current behaviour causes
==============================================
1. Information leak. When the user is away, someone might see what the
user has on the display when the user counts on the screensaver
preventing this. This does not even require physical access to the
workstation, it is enough to see it from a distance.
2. Draining battery. An SDL program that runs on a laptop will quickly
drain the battery while the user is away. The system will soon shut down
and require recharging before being usable again, while it should in
fact have consumed very little energy if the user's settings would have
been obeyed.
3. Wasting energy. Even if battery issues are not considered, energy as
such is wasted.
4. Display wear. The display may be worn out.
The problems that the current behaviour tries to solve
======================================================
1. Preventing screensaver while playing movies.
Many SDL applications are media players. They have reasons to prevent
screensavers from being activated while a movie is being played. When a
user clicks on the play button it can be interpreted as saying "play
this movie, but do not turn off the display while playing it, because I
will watch it even though I do not interact with the system".
2. Preventing screensaver when some input bypasses X.
Sometimes SDL uses input from another source than the X server, so
that the X server is bypassed. This obviously breaks the screensaver
handling. SDL tries to work around that.
3. Preventing screensaver when all input bypasses X.
There is something called Direct Graphics Access mode, where a
program takes control of both the display and the input devices from the
X server. This obviously means that the X server can not handle the
screensaver alone, since screensaver handling depends on input handling.
SDL does not do what it should to help the X server to handle the
screensaver. Nor does SDL take care of screeensaver handling itself. SDL
simply disables the screensaver completely.
How the problems should be solved
=================================
The correct way for an application program to prevent the screensaver
under X is to call XResetScreenSaver. This was recently discovered and
implemented by the mplayer developers,
[http://svn.mplayerhq.hu/mplayer?view=rev&revision=25637]. SDL needs to
wrap this in an API call (SDL_ResetScreenSaver) and implement it for the
other video targets (if they do not have a corresponding call, SDL
should do what it takes on that particular target, for example sending
fake key events).
1. When a movie is played, the player should reset the screensaver when
the animation is advanced to a new frame. The same applies to anything
similar, like slideshows.
2. When the X server is handling input, it must handle all input
(keyboards, mice, gamepads, ...). This is necessary, not only to be able
to handle the screensaver, but also so that it can send the events to
the correct (the currently active) client. If there is an input device
that the X server can not handle for some reason (such as lack of Plug
and Play capability), the program that handles the device as a
workaround must simulate what would happen if the X server would have
handled the device, by calling XResetScreenSaver when input is received
from the device.
3. When the X server is not handling the input, it depends on the
program that does to call XResetScreenSaver whenever an input event
occurs. Alternatively the program must handle the screensaver countdown
internally and call XActivateScreenSaver.
author | Sam Lantinga <slouken@libsdl.org> |
---|---|
date | Fri, 29 Feb 2008 13:55:44 +0000 |
parents | 8582c6a5ca16 |
children | a1b03ba2fcd0 |
rev | line source |
---|---|
0 | 1 /* |
2 SDL - Simple DirectMedia Layer | |
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3 Copyright (C) 1997-2006 Sam Lantinga |
0 | 4 |
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 |
0 | 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. |
0 | 9 |
10 This library is distributed in the hope that it will be useful, | |
11 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
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13 Lesser General Public License for more details. |
0 | 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 |
0 | 18 |
19 Sam Lantinga | |
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20 slouken@libsdl.org |
0 | 21 */ |
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22 #include "SDL_config.h" |
0 | 23 |
24 #ifndef _SDL_sysvideo_h | |
25 #define _SDL_sysvideo_h | |
26 | |
27 #include "SDL_mouse.h" | |
28 #define SDL_PROTOTYPES_ONLY | |
29 #include "SDL_syswm.h" | |
30 #undef SDL_PROTOTYPES_ONLY | |
31 | |
32 /* This file prototypes the video driver implementation. | |
33 This is designed to be easily converted to C++ in the future. | |
34 */ | |
35 | |
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36 #if SDL_VIDEO_OPENGL |
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37 #include "SDL_opengl.h" |
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38 #endif /* SDL_VIDEO_OPENGL */ |
0 | 39 |
40 /* The SDL video driver */ | |
41 typedef struct SDL_VideoDevice SDL_VideoDevice; | |
42 | |
43 /* Define the SDL video driver structure */ | |
44 #define _THIS SDL_VideoDevice *_this | |
45 #ifndef _STATUS | |
46 #define _STATUS SDL_status *status | |
47 #endif | |
48 struct SDL_VideoDevice { | |
49 /* * * */ | |
47
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50 /* The name of this video driver */ |
0 | 51 const char *name; |
52 | |
53 /* * * */ | |
54 /* Initialization/Query functions */ | |
55 | |
56 /* Initialize the native video subsystem, filling 'vformat' with the | |
57 "best" display pixel format, returning 0 or -1 if there's an error. | |
58 */ | |
59 int (*VideoInit)(_THIS, SDL_PixelFormat *vformat); | |
60 | |
61 /* List the available video modes for the given pixel format, sorted | |
62 from largest to smallest. | |
63 */ | |
64 SDL_Rect **(*ListModes)(_THIS, SDL_PixelFormat *format, Uint32 flags); | |
65 | |
66 /* Set the requested video mode, returning a surface which will be | |
67 set to the SDL_VideoSurface. The width and height will already | |
68 be verified by ListModes(), and the video subsystem is free to | |
69 set the mode to a supported bit depth different from the one | |
70 specified -- the desired bpp will be emulated with a shadow | |
71 surface if necessary. If a new mode is returned, this function | |
72 should take care of cleaning up the current mode. | |
73 */ | |
74 SDL_Surface *(*SetVideoMode)(_THIS, SDL_Surface *current, | |
75 int width, int height, int bpp, Uint32 flags); | |
76 | |
77 /* Toggle the fullscreen mode */ | |
78 int (*ToggleFullScreen)(_THIS, int on); | |
79 | |
80 /* This is called after the video mode has been set, to get the | |
81 initial mouse state. It should queue events as necessary to | |
82 properly represent the current mouse focus and position. | |
83 */ | |
84 void (*UpdateMouse)(_THIS); | |
85 | |
86 /* Create a YUV video surface (possibly overlay) of the given | |
87 format. The hardware should be able to perform at least 2x | |
88 scaling on display. | |
89 */ | |
90 SDL_Overlay *(*CreateYUVOverlay)(_THIS, int width, int height, | |
91 Uint32 format, SDL_Surface *display); | |
92 | |
93 /* Sets the color entries { firstcolor .. (firstcolor+ncolors-1) } | |
94 of the physical palette to those in 'colors'. If the device is | |
95 using a software palette (SDL_HWPALETTE not set), then the | |
96 changes are reflected in the logical palette of the screen | |
97 as well. | |
98 The return value is 1 if all entries could be set properly | |
99 or 0 otherwise. | |
100 */ | |
101 int (*SetColors)(_THIS, int firstcolor, int ncolors, | |
102 SDL_Color *colors); | |
103 | |
104 /* This pointer should exist in the native video subsystem and should | |
105 point to an appropriate update function for the current video mode | |
106 */ | |
107 void (*UpdateRects)(_THIS, int numrects, SDL_Rect *rects); | |
108 | |
109 /* Reverse the effects VideoInit() -- called if VideoInit() fails | |
110 or if the application is shutting down the video subsystem. | |
111 */ | |
112 void (*VideoQuit)(_THIS); | |
113 | |
114 /* * * */ | |
115 /* Hardware acceleration functions */ | |
116 | |
117 /* Information about the video hardware */ | |
118 SDL_VideoInfo info; | |
119 | |
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120 /* The pixel format used when SDL_CreateRGBSurface creates SDL_HWSURFACEs with alpha */ |
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121 SDL_PixelFormat* displayformatalphapixel; |
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122 |
0 | 123 /* Allocates a surface in video memory */ |
124 int (*AllocHWSurface)(_THIS, SDL_Surface *surface); | |
125 | |
126 /* Sets the hardware accelerated blit function, if any, based | |
127 on the current flags of the surface (colorkey, alpha, etc.) | |
128 */ | |
129 int (*CheckHWBlit)(_THIS, SDL_Surface *src, SDL_Surface *dst); | |
130 | |
131 /* Fills a surface rectangle with the given color */ | |
132 int (*FillHWRect)(_THIS, SDL_Surface *dst, SDL_Rect *rect, Uint32 color); | |
133 | |
134 /* Sets video mem colorkey and accelerated blit function */ | |
135 int (*SetHWColorKey)(_THIS, SDL_Surface *surface, Uint32 key); | |
136 | |
137 /* Sets per surface hardware alpha value */ | |
138 int (*SetHWAlpha)(_THIS, SDL_Surface *surface, Uint8 value); | |
139 | |
140 /* Returns a readable/writable surface */ | |
141 int (*LockHWSurface)(_THIS, SDL_Surface *surface); | |
142 void (*UnlockHWSurface)(_THIS, SDL_Surface *surface); | |
143 | |
144 /* Performs hardware flipping */ | |
145 int (*FlipHWSurface)(_THIS, SDL_Surface *surface); | |
146 | |
147 /* Frees a previously allocated video surface */ | |
148 void (*FreeHWSurface)(_THIS, SDL_Surface *surface); | |
149 | |
150 /* * * */ | |
151 /* Gamma support */ | |
152 | |
153 Uint16 *gamma; | |
154 | |
155 /* Set the gamma correction directly (emulated with gamma ramps) */ | |
156 int (*SetGamma)(_THIS, float red, float green, float blue); | |
157 | |
158 /* Get the gamma correction directly (emulated with gamma ramps) */ | |
159 int (*GetGamma)(_THIS, float *red, float *green, float *blue); | |
160 | |
161 /* Set the gamma ramp */ | |
162 int (*SetGammaRamp)(_THIS, Uint16 *ramp); | |
163 | |
164 /* Get the gamma ramp */ | |
165 int (*GetGammaRamp)(_THIS, Uint16 *ramp); | |
166 | |
167 /* * * */ | |
168 /* OpenGL support */ | |
169 | |
170 /* Sets the dll to use for OpenGL and loads it */ | |
171 int (*GL_LoadLibrary)(_THIS, const char *path); | |
172 | |
173 /* Retrieves the address of a function in the gl library */ | |
174 void* (*GL_GetProcAddress)(_THIS, const char *proc); | |
175 | |
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176 /* Get attribute information from the windowing system. */ |
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177 int (*GL_GetAttribute)(_THIS, SDL_GLattr attrib, int* value); |
0 | 178 |
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179 /* Make the context associated with this driver current */ |
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180 int (*GL_MakeCurrent)(_THIS); |
0 | 181 |
182 /* Swap the current buffers in double buffer mode. */ | |
183 void (*GL_SwapBuffers)(_THIS); | |
184 | |
185 /* OpenGL functions for SDL_OPENGLBLIT */ | |
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186 #if SDL_VIDEO_OPENGL |
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187 #if !defined(__WIN32__) |
0 | 188 #define WINAPI |
189 #endif | |
190 #define SDL_PROC(ret,func,params) ret (WINAPI *func) params; | |
191 #include "SDL_glfuncs.h" | |
192 #undef SDL_PROC | |
193 | |
194 /* Texture id */ | |
195 GLuint texture; | |
196 #endif | |
197 int is_32bit; | |
198 | |
199 /* * * */ | |
200 /* Window manager functions */ | |
201 | |
202 /* Set the title and icon text */ | |
203 void (*SetCaption)(_THIS, const char *title, const char *icon); | |
204 | |
205 /* Set the window icon image */ | |
206 void (*SetIcon)(_THIS, SDL_Surface *icon, Uint8 *mask); | |
207 | |
208 /* Iconify the window. | |
209 This function returns 1 if there is a window manager and the | |
210 window was actually iconified, it returns 0 otherwise. | |
211 */ | |
212 int (*IconifyWindow)(_THIS); | |
213 | |
214 /* Grab or ungrab keyboard and mouse input */ | |
215 SDL_GrabMode (*GrabInput)(_THIS, SDL_GrabMode mode); | |
216 | |
217 /* Get some platform dependent window information */ | |
218 int (*GetWMInfo)(_THIS, SDL_SysWMinfo *info); | |
219 | |
220 /* * * */ | |
221 /* Cursor manager functions */ | |
222 | |
223 /* Free a window manager cursor | |
224 This function can be NULL if CreateWMCursor is also NULL. | |
225 */ | |
226 void (*FreeWMCursor)(_THIS, WMcursor *cursor); | |
227 | |
228 /* If not NULL, create a black/white window manager cursor */ | |
229 WMcursor *(*CreateWMCursor)(_THIS, | |
230 Uint8 *data, Uint8 *mask, int w, int h, int hot_x, int hot_y); | |
231 | |
232 /* Show the specified cursor, or hide if cursor is NULL */ | |
233 int (*ShowWMCursor)(_THIS, WMcursor *cursor); | |
234 | |
235 /* Warp the window manager cursor to (x,y) | |
236 If NULL, a mouse motion event is posted internally. | |
237 */ | |
238 void (*WarpWMCursor)(_THIS, Uint16 x, Uint16 y); | |
239 | |
240 /* If not NULL, this is called when a mouse motion event occurs */ | |
241 void (*MoveWMCursor)(_THIS, int x, int y); | |
242 | |
243 /* Determine whether the mouse should be in relative mode or not. | |
244 This function is called when the input grab state or cursor | |
245 visibility state changes. | |
246 If the cursor is not visible, and the input is grabbed, the | |
247 driver can place the mouse in relative mode, which may result | |
248 in higher accuracy sampling of the pointer motion. | |
249 */ | |
250 void (*CheckMouseMode)(_THIS); | |
251 | |
252 /* * * */ | |
253 /* Event manager functions */ | |
254 | |
255 /* Initialize keyboard mapping for this driver */ | |
256 void (*InitOSKeymap)(_THIS); | |
257 | |
258 /* Handle any queued OS events */ | |
259 void (*PumpEvents)(_THIS); | |
260 | |
261 /* * * */ | |
262 /* Data common to all drivers */ | |
263 SDL_Surface *screen; | |
264 SDL_Surface *shadow; | |
265 SDL_Surface *visible; | |
266 SDL_Palette *physpal; /* physical palette, if != logical palette */ | |
267 SDL_Color *gammacols; /* gamma-corrected colours, or NULL */ | |
268 char *wm_title; | |
269 char *wm_icon; | |
270 int offset_x; | |
271 int offset_y; | |
272 SDL_GrabMode input_grab; | |
273 | |
274 /* Driver information flags */ | |
275 int handles_any_size; /* Driver handles any size video mode */ | |
276 | |
277 /* * * */ | |
278 /* Data used by the GL drivers */ | |
279 struct { | |
280 int red_size; | |
281 int green_size; | |
282 int blue_size; | |
283 int alpha_size; | |
284 int depth_size; | |
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285 int buffer_size; |
0 | 286 int stencil_size; |
287 int double_buffer; | |
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288 int accum_red_size; |
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289 int accum_green_size; |
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290 int accum_blue_size; |
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291 int accum_alpha_size; |
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292 int stereo; |
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293 int multisamplebuffers; |
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294 int multisamplesamples; |
1737 | 295 int accelerated; |
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296 int swap_control; |
0 | 297 int driver_loaded; |
298 char driver_path[256]; | |
299 void* dll_handle; | |
300 } gl_config; | |
301 | |
302 /* * * */ | |
303 /* Data private to this driver */ | |
304 struct SDL_PrivateVideoData *hidden; | |
305 struct SDL_PrivateGLData *gl_data; | |
306 | |
307 /* * * */ | |
308 /* The function used to dispose of this structure */ | |
309 void (*free)(_THIS); | |
310 }; | |
311 #undef _THIS | |
312 | |
313 typedef struct VideoBootStrap { | |
314 const char *name; | |
315 const char *desc; | |
316 int (*available)(void); | |
317 SDL_VideoDevice *(*create)(int devindex); | |
318 } VideoBootStrap; | |
319 | |
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320 #if SDL_VIDEO_DRIVER_QUARTZ |
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321 extern VideoBootStrap QZ_bootstrap; |
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322 #endif |
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323 #if SDL_VIDEO_DRIVER_X11 |
0 | 324 extern VideoBootStrap X11_bootstrap; |
325 #endif | |
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326 #if SDL_VIDEO_DRIVER_DGA |
0 | 327 extern VideoBootStrap DGA_bootstrap; |
328 #endif | |
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329 #if SDL_VIDEO_DRIVER_NANOX |
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330 extern VideoBootStrap NX_bootstrap; |
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331 #endif |
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332 #if SDL_VIDEO_DRIVER_IPOD |
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333 extern VideoBootStrap iPod_bootstrap; |
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334 #endif |
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335 #if SDL_VIDEO_DRIVER_QTOPIA |
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336 extern VideoBootStrap Qtopia_bootstrap; |
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337 #endif |
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338 #if SDL_VIDEO_DRIVER_WSCONS |
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339 extern VideoBootStrap WSCONS_bootstrap; |
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340 #endif |
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341 #if SDL_VIDEO_DRIVER_FBCON |
0 | 342 extern VideoBootStrap FBCON_bootstrap; |
343 #endif | |
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344 #if SDL_VIDEO_DRIVER_DIRECTFB |
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345 extern VideoBootStrap DirectFB_bootstrap; |
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346 #endif |
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347 #if SDL_VIDEO_DRIVER_PS2GS |
0 | 348 extern VideoBootStrap PS2GS_bootstrap; |
349 #endif | |
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350 #if SDL_VIDEO_DRIVER_GGI |
0 | 351 extern VideoBootStrap GGI_bootstrap; |
352 #endif | |
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353 #if SDL_VIDEO_DRIVER_VGL |
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354 extern VideoBootStrap VGL_bootstrap; |
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355 #endif |
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356 #if SDL_VIDEO_DRIVER_SVGALIB |
0 | 357 extern VideoBootStrap SVGALIB_bootstrap; |
358 #endif | |
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359 #if SDL_VIDEO_DRIVER_GAPI |
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360 extern VideoBootStrap GAPI_bootstrap; |
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361 #endif |
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362 #if SDL_VIDEO_DRIVER_WINDIB |
0 | 363 extern VideoBootStrap WINDIB_bootstrap; |
364 #endif | |
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365 #if SDL_VIDEO_DRIVER_DDRAW |
0 | 366 extern VideoBootStrap DIRECTX_bootstrap; |
367 #endif | |
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368 #if SDL_VIDEO_DRIVER_BWINDOW |
0 | 369 extern VideoBootStrap BWINDOW_bootstrap; |
370 #endif | |
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371 #if SDL_VIDEO_DRIVER_TOOLBOX |
0 | 372 extern VideoBootStrap TOOLBOX_bootstrap; |
373 #endif | |
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374 #if SDL_VIDEO_DRIVER_DRAWSPROCKET |
0 | 375 extern VideoBootStrap DSp_bootstrap; |
376 #endif | |
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377 #if SDL_VIDEO_DRIVER_PHOTON |
173
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378 extern VideoBootStrap ph_bootstrap; |
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379 #endif |
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380 #if SDL_VIDEO_DRIVER_EPOC |
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381 extern VideoBootStrap EPOC_bootstrap; |
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382 #endif |
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383 #if SDL_VIDEO_DRIVER_XBIOS |
281
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384 extern VideoBootStrap XBIOS_bootstrap; |
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385 #endif |
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386 #if SDL_VIDEO_DRIVER_GEM |
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387 extern VideoBootStrap GEM_bootstrap; |
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388 #endif |
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389 #if SDL_VIDEO_DRIVER_PICOGUI |
433
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390 extern VideoBootStrap PG_bootstrap; |
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391 #endif |
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392 #if SDL_VIDEO_DRIVER_DC |
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393 extern VideoBootStrap DC_bootstrap; |
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394 #endif |
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395 #if SDL_VIDEO_DRIVER_NDS |
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396 extern VideoBootStrap NDS_bootstrap; |
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397 #endif |
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398 #if SDL_VIDEO_DRIVER_RISCOS |
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399 extern VideoBootStrap RISCOS_bootstrap; |
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400 #endif |
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401 #if SDL_VIDEO_DRIVER_OS2FS |
1190 | 402 extern VideoBootStrap OS2FSLib_bootstrap; |
403 #endif | |
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404 #if SDL_VIDEO_DRIVER_AALIB |
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405 extern VideoBootStrap AALIB_bootstrap; |
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406 #endif |
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407 #if SDL_VIDEO_DRIVER_DUMMY |
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408 extern VideoBootStrap DUMMY_bootstrap; |
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409 #endif |
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410 |
0 | 411 /* This is the current video device */ |
412 extern SDL_VideoDevice *current_video; | |
413 | |
414 #define SDL_VideoSurface (current_video->screen) | |
415 #define SDL_ShadowSurface (current_video->shadow) | |
416 #define SDL_PublicSurface (current_video->visible) | |
417 | |
418 #endif /* _SDL_sysvideo_h */ |