2 * Ideas for screen management extension to EGL.
4 * Each EGLDisplay has one or more screens (CRTs, Flat Panels, etc).
5 * The screens' handles can be obtained with eglGetScreensMESA().
7 * A new kind of EGLSurface is possible- one which can be directly scanned
8 * out on a screen. Such a surface is created with eglCreateScreenSurface().
10 * To actually display a screen surface on a screen, the eglShowSurface()
18 #include "egldisplay.h"
19 #include "eglcurrent.h"
21 #include "eglconfig.h"
22 #include "eglsurface.h"
23 #include "eglscreen.h"
27 #ifdef EGL_MESA_screen_surface
30 /* ugh, no atomic op? */
31 static _EGL_DECLARE_MUTEX(_eglNextScreenHandleMutex
);
32 static EGLScreenMESA _eglNextScreenHandle
= 1;
36 * Return a new screen handle/ID.
37 * NOTE: we never reuse these!
40 _eglAllocScreenHandle(void)
44 _eglLockMutex(&_eglNextScreenHandleMutex
);
45 s
= _eglNextScreenHandle
++;
46 _eglUnlockMutex(&_eglNextScreenHandleMutex
);
53 * Initialize an _EGLScreen object to default values.
56 _eglInitScreen(_EGLScreen
*screen
)
58 memset(screen
, 0, sizeof(_EGLScreen
));
65 * Given a public screen handle, return the internal _EGLScreen object.
68 _eglLookupScreen(EGLScreenMESA screen
, _EGLDisplay
*display
)
72 if (!display
|| !display
->Screens
)
75 for (i
= 0; i
< display
->Screens
->Size
; i
++) {
76 _EGLScreen
*scr
= (_EGLScreen
*) display
->Screens
->Elements
[i
];
77 if (scr
->Handle
== screen
)
85 * Add the given _EGLScreen to the display's list of screens.
88 _eglAddScreen(_EGLDisplay
*display
, _EGLScreen
*screen
)
93 if (!display
->Screens
) {
94 display
->Screens
= _eglCreateArray("Screen", 4);
95 if (!display
->Screens
)
98 screen
->Handle
= _eglAllocScreenHandle();
99 _eglAppendArray(display
->Screens
, (void *) screen
);
105 _eglFlattenScreen(void *elem
, void *buffer
)
107 _EGLScreen
*scr
= (_EGLScreen
*) elem
;
108 EGLScreenMESA
*handle
= (EGLScreenMESA
*) buffer
;
109 *handle
= scr
->Handle
;
115 _eglGetScreensMESA(_EGLDriver
*drv
, _EGLDisplay
*display
, EGLScreenMESA
*screens
,
116 EGLint max_screens
, EGLint
*num_screens
)
118 *num_screens
= _eglFlattenArray(display
->Screens
, (void *) screens
,
119 sizeof(screens
[0]), max_screens
, _eglFlattenScreen
);
126 * Set a screen's current display mode.
127 * Note: mode = EGL_NO_MODE is valid (turns off the screen)
129 * This is just a placeholder function; drivers will always override
130 * this with code that _really_ sets the mode.
133 _eglScreenModeMESA(_EGLDriver
*drv
, _EGLDisplay
*dpy
, _EGLScreen
*scrn
,
136 scrn
->CurrentMode
= m
;
142 * Set a screen's surface origin.
145 _eglScreenPositionMESA(_EGLDriver
*drv
, _EGLDisplay
*dpy
,
146 _EGLScreen
*scrn
, EGLint x
, EGLint y
)
156 * Query a screen's current surface.
159 _eglQueryScreenSurfaceMESA(_EGLDriver
*drv
, _EGLDisplay
*dpy
,
160 _EGLScreen
*scrn
, _EGLSurface
**surf
)
162 *surf
= scrn
->CurrentSurface
;
168 * Query a screen's current mode.
171 _eglQueryScreenModeMESA(_EGLDriver
*drv
, _EGLDisplay
*dpy
, _EGLScreen
*scrn
,
174 *m
= scrn
->CurrentMode
;
180 _eglQueryScreenMESA(_EGLDriver
*drv
, _EGLDisplay
*dpy
, _EGLScreen
*scrn
,
181 EGLint attribute
, EGLint
*value
)
184 case EGL_SCREEN_POSITION_MESA
:
185 value
[0] = scrn
->OriginX
;
186 value
[1] = scrn
->OriginY
;
188 case EGL_SCREEN_POSITION_GRANULARITY_MESA
:
189 value
[0] = scrn
->StepX
;
190 value
[1] = scrn
->StepY
;
193 _eglError(EGL_BAD_ATTRIBUTE
, "eglQueryScreenMESA");
202 * Delete the modes associated with given screen.
205 _eglDestroyScreenModes(_EGLScreen
*scrn
)
208 for (i
= 0; i
< scrn
->NumModes
; i
++) {
209 if (scrn
->Modes
[i
].Name
)
210 free((char *) scrn
->Modes
[i
].Name
); /* cast away const */
220 * Default fallback routine - drivers should usually override this.
223 _eglDestroyScreen(_EGLScreen
*scrn
)
225 _eglDestroyScreenModes(scrn
);
230 #endif /* EGL_MESA_screen_surface */