src/egl/main/egldisplay.c

   1 /**
   2  * Functions related to EGLDisplay.
   3  */
   4
   5 #include <assert.h>
   6 #include <stdlib.h>
   7 #include <string.h>
   8 #include "eglcontext.h"
   9 #include "eglsurface.h"
  10 #include "egldisplay.h"
  11 #include "egldriver.h"
  12 #include "eglglobals.h"
  13 #include "eglmutex.h"
  14 #include "egllog.h"
  15
  16
  17 /**
  18  * Return the native platform by parsing EGL_PLATFORM.
  19  */
  20 static _EGLPlatformType
  21 _eglGetNativePlatformFromEnv(void)
  22 {
  23    /* map --with-egl-platforms names to platform types */
  24    static const struct {
  25       _EGLPlatformType platform;
  26       const char *name;
  27    } egl_platforms[_EGL_NUM_PLATFORMS] = {
  28       { _EGL_PLATFORM_WINDOWS, "gdi" },
  29       { _EGL_PLATFORM_X11, "x11" },
  30       { _EGL_PLATFORM_DRM, "kms" },
  31       { _EGL_PLATFORM_FBDEV, "fbdev" }
  32    };
  33    _EGLPlatformType plat = _EGL_INVALID_PLATFORM;
  34    const char *plat_name;
  35    EGLint i;
  36
  37    plat_name = getenv("EGL_PLATFORM");
  38    /* try deprecated env variable */
  39    if (!plat_name || !plat_name[0])
  40       plat_name = getenv("EGL_DISPLAY");
  41    if (!plat_name || !plat_name[0])
  42       return _EGL_INVALID_PLATFORM;
  43
  44    for (i = 0; i < _EGL_NUM_PLATFORMS; i++) {
  45       if (strcmp(egl_platforms[i].name, plat_name) == 0) {
  46          plat = egl_platforms[i].platform;
  47          break;
  48       }
  49    }
  50
  51    return plat;
  52 }
  53
  54
  55 /**
  56  * Return the native platform.  It is the platform of the EGL native types.
  57  */
  58 _EGLPlatformType
  59 _eglGetNativePlatform(void)
  60 {
  61    static _EGLPlatformType native_platform = _EGL_INVALID_PLATFORM;
  62
  63    if (native_platform == _EGL_INVALID_PLATFORM) {
  64       native_platform = _eglGetNativePlatformFromEnv();
  65       if (native_platform == _EGL_INVALID_PLATFORM)
  66          native_platform = _EGL_NATIVE_PLATFORM;
  67    }
  68
  69    return native_platform;
  70 }
  71
  72
  73 /**
  74  * Finish display management.
  75  */
  76 void
  77 _eglFiniDisplay(void)
  78 {
  79    _EGLDisplay *dpyList, *dpy;
  80
  81    /* atexit function is called with global mutex locked */
  82    dpyList = _eglGlobal.DisplayList;
  83    while (dpyList) {
  84       EGLint i;
  85
  86       /* pop list head */
  87       dpy = dpyList;
  88       dpyList = dpyList->Next;
  89
  90       for (i = 0; i < _EGL_NUM_RESOURCES; i++) {
  91          if (dpy->ResourceLists[i]) {
  92             _eglLog(_EGL_DEBUG, "Display %p is destroyed with resources", dpy);
  93             break;
  94          }
  95       }
  96
  97       free(dpy);
  98    }
  99    _eglGlobal.DisplayList = NULL;
 100 }
 101
 102
 103 /**
 104  * Find the display corresponding to the specified native display, or create a
 105  * new one.
 106  */
 107 _EGLDisplay *
 108 _eglFindDisplay(_EGLPlatformType plat, void *plat_dpy)
 109 {
 110    _EGLDisplay *dpy;
 111
 112    if (plat == _EGL_INVALID_PLATFORM)
 113       return NULL;
 114
 115    _eglLockMutex(_eglGlobal.Mutex);
 116
 117    /* search the display list first */
 118    dpy = _eglGlobal.DisplayList;
 119    while (dpy) {
 120       if (dpy->Platform == plat && dpy->PlatformDisplay == plat_dpy)
 121          break;
 122       dpy = dpy->Next;
 123    }
 124
 125    /* create a new display */
 126    if (!dpy) {
 127       dpy = (_EGLDisplay *) calloc(1, sizeof(_EGLDisplay));
 128       if (dpy) {
 129          _eglInitMutex(&dpy->Mutex);
 130          dpy->Platform = plat;
 131          dpy->PlatformDisplay = plat_dpy;
 132
 133          /* add to the display list */
 134          dpy->Next = _eglGlobal.DisplayList;
 135          _eglGlobal.DisplayList = dpy;
 136       }
 137    }
 138
 139    _eglUnlockMutex(_eglGlobal.Mutex);
 140
 141    return dpy;
 142 }
 143
 144
 145 /**
 146  * Destroy the contexts and surfaces that are linked to the display.
 147  */
 148 void
 149 _eglReleaseDisplayResources(_EGLDriver *drv, _EGLDisplay *display)
 150 {
 151    _EGLResource *list;
 152
 153    list = display->ResourceLists[_EGL_RESOURCE_CONTEXT];
 154    while (list) {
 155       _EGLContext *ctx = (_EGLContext *) list;
 156       list = list->Next;
 157
 158       _eglUnlinkContext(ctx);
 159       drv->API.DestroyContext(drv, display, ctx);
 160    }
 161    assert(!display->ResourceLists[_EGL_RESOURCE_CONTEXT]);
 162
 163    list = display->ResourceLists[_EGL_RESOURCE_SURFACE];
 164    while (list) {
 165       _EGLSurface *surf = (_EGLSurface *) list;
 166       list = list->Next;
 167
 168       _eglUnlinkSurface(surf);
 169       drv->API.DestroySurface(drv, display, surf);
 170    }
 171    assert(!display->ResourceLists[_EGL_RESOURCE_SURFACE]);
 172 }
 173
 174
 175 /**
 176  * Free all the data hanging of an _EGLDisplay object, but not
 177  * the object itself.
 178  */
 179 void
 180 _eglCleanupDisplay(_EGLDisplay *disp)
 181 {
 182    if (disp->Configs) {
 183       _eglDestroyArray(disp->Configs, free);
 184       disp->Configs = NULL;
 185    }
 186
 187    /* XXX incomplete */
 188 }
 189
 190
 191 /**
 192  * Return EGL_TRUE if the given handle is a valid handle to a display.
 193  */
 194 EGLBoolean
 195 _eglCheckDisplayHandle(EGLDisplay dpy)
 196 {
 197    _EGLDisplay *cur;
 198
 199    _eglLockMutex(_eglGlobal.Mutex);
 200    cur = _eglGlobal.DisplayList;
 201    while (cur) {
 202       if (cur == (_EGLDisplay *) dpy)
 203          break;
 204       cur = cur->Next;
 205    }
 206    _eglUnlockMutex(_eglGlobal.Mutex);
 207    return (cur != NULL);
 208 }
 209
 210
 211 /**
 212  * Return EGL_TRUE if the given resource is valid.  That is, the display does
 213  * own the resource.
 214  */
 215 EGLBoolean
 216 _eglCheckResource(void *res, _EGLResourceType type, _EGLDisplay *dpy)
 217 {
 218    _EGLResource *list = dpy->ResourceLists[type];
 219
 220    if (!res)
 221       return EGL_FALSE;
 222
 223    while (list) {
 224       if (res == (void *) list) {
 225          assert(list->Display == dpy);
 226          break;
 227       }
 228       list = list->Next;
 229    }
 230
 231    return (list != NULL);
 232 }
 233
 234
 235 /**
 236  * Link a resource to a display.
 237  */
 238 void
 239 _eglLinkResource(_EGLResource *res, _EGLResourceType type, _EGLDisplay *dpy)
 240 {
 241    assert(!res->Display || res->Display == dpy);
 242
 243    res->Display = dpy;
 244    res->IsLinked = EGL_TRUE;
 245    res->Next = dpy->ResourceLists[type];
 246    dpy->ResourceLists[type] = res;
 247 }
 248
 249
 250 /**
 251  * Unlink a linked resource from its display.
 252  */
 253 void
 254 _eglUnlinkResource(_EGLResource *res, _EGLResourceType type)
 255 {
 256    _EGLResource *prev;
 257
 258    prev = res->Display->ResourceLists[type];
 259    if (prev != res) {
 260       while (prev) {
 261          if (prev->Next == res)
 262             break;
 263          prev = prev->Next;
 264       }
 265       assert(prev);
 266       prev->Next = res->Next;
 267    }
 268    else {
 269       res->Display->ResourceLists[type] = res->Next;
 270    }
 271
 272    res->Next = NULL;
 273    /* do not reset res->Display */
 274    res->IsLinked = EGL_FALSE;
 275 }