src/egl/main/eglcontext.c

   1 #include <assert.h>
   2 #include <stdlib.h>
   3 #include <string.h>
   4 #include "eglconfig.h"
   5 #include "eglcontext.h"
   6 #include "egldisplay.h"
   7 #include "egldriver.h"
   8 #include "eglglobals.h"
   9 #include "eglsurface.h"
  10
  11
  12 /**
  13  * Initialize the given _EGLContext object to defaults and/or the values
  14  * in the attrib_list.
  15  */
  16 EGLBoolean
  17 _eglInitContext(_EGLDriver *drv, _EGLContext *ctx,
  18                 _EGLConfig *conf, const EGLint *attrib_list)
  19 {
  20    EGLint i;
  21    const EGLenum api = eglQueryAPI();
  22
  23    if (api == EGL_NONE) {
  24       _eglError(EGL_BAD_MATCH, "eglCreateContext(no client API)");
  25       return EGL_FALSE;
  26    }
  27
  28    if (!conf) {
  29       _eglError(EGL_BAD_CONFIG, "_eglInitContext");
  30       return EGL_FALSE;
  31    }
  32
  33    memset(ctx, 0, sizeof(_EGLContext));
  34
  35    ctx->ClientVersion = 1; /* the default, per EGL spec */
  36
  37    for (i = 0; attrib_list && attrib_list[i] != EGL_NONE; i++) {
  38       switch (attrib_list[i]) {
  39       case EGL_CONTEXT_CLIENT_VERSION:
  40          i++;
  41          ctx->ClientVersion = attrib_list[i];
  42          break;
  43       default:
  44          _eglError(EGL_BAD_ATTRIBUTE, "_eglInitContext");
  45          return EGL_FALSE;
  46       }
  47    }
  48
  49    ctx->Config = conf;
  50    ctx->DrawSurface = EGL_NO_SURFACE;
  51    ctx->ReadSurface = EGL_NO_SURFACE;
  52    ctx->ClientAPI = api;
  53
  54    return EGL_TRUE;
  55 }
  56
  57
  58 /**
  59  * Just a placeholder/demo function.  Real driver will never use this!
  60  */
  61 EGLContext
  62 _eglCreateContext(_EGLDriver *drv, EGLDisplay dpy, EGLConfig config,
  63                   EGLContext share_list, const EGLint *attrib_list)
  64 {
  65 #if 0 /* example code */
  66    _EGLContext *context;
  67    _EGLConfig *conf;
  68
  69    conf = _eglLookupConfig(drv, dpy, config);
  70    if (!conf) {
  71       _eglError(EGL_BAD_CONFIG, "eglCreateContext");
  72       return EGL_NO_CONTEXT;
  73    }
  74
  75    context = (_EGLContext *) calloc(1, sizeof(_EGLContext));
  76    if (!context)
  77       return EGL_NO_CONTEXT;
  78
  79    if (!_eglInitContext(drv, context, conf, attrib_list)) {
  80       free(context);
  81       return EGL_NO_CONTEXT;
  82    }
  83
  84    return _eglLinkContext(context, _eglLookupDisplay(dpy));
  85 #endif
  86    return EGL_NO_CONTEXT;
  87 }
  88
  89
  90 /**
  91  * Default fallback routine - drivers should usually override this.
  92  */
  93 EGLBoolean
  94 _eglDestroyContext(_EGLDriver *drv, EGLDisplay dpy, EGLContext ctx)
  95 {
  96    _EGLContext *context = _eglLookupContext(ctx);
  97    if (context) {
  98       _eglUnlinkContext(context);
  99       if (!_eglIsContextBound(context))
 100          free(context);
 101       return EGL_TRUE;
 102    }
 103    else {
 104       _eglError(EGL_BAD_CONTEXT, "eglDestroyContext");
 105       return EGL_TRUE;
 106    }
 107 }
 108
 109
 110 EGLBoolean
 111 _eglQueryContext(_EGLDriver *drv, EGLDisplay dpy, EGLContext ctx,
 112                  EGLint attribute, EGLint *value)
 113 {
 114    _EGLContext *c = _eglLookupContext(ctx);
 115
 116    (void) drv;
 117    (void) dpy;
 118
 119    if (!c) {
 120       _eglError(EGL_BAD_CONTEXT, "eglQueryContext");
 121       return EGL_FALSE;
 122    }
 123
 124    switch (attribute) {
 125    case EGL_CONFIG_ID:
 126       *value = GET_CONFIG_ATTRIB(c->Config, EGL_CONFIG_ID);
 127       return EGL_TRUE;
 128 #ifdef EGL_VERSION_1_2
 129    case EGL_CONTEXT_CLIENT_TYPE:
 130       *value = c->ClientAPI;
 131       return EGL_TRUE;
 132 #endif /* EGL_VERSION_1_2 */
 133    case EGL_CONTEXT_CLIENT_VERSION:
 134       *value = c->ClientVersion;
 135       return EGL_TRUE;
 136    default:
 137       _eglError(EGL_BAD_ATTRIBUTE, "eglQueryContext");
 138       return EGL_FALSE;
 139    }
 140 }
 141
 142
 143 /**
 144  * Drivers will typically call this to do the error checking and
 145  * update the various flags.
 146  * Then, the driver will do its device-dependent Make-Current stuff.
 147  */
 148 EGLBoolean
 149 _eglMakeCurrent(_EGLDriver *drv, EGLDisplay dpy, EGLSurface d,
 150                 EGLSurface r, EGLContext context)
 151 {
 152    _EGLThreadInfo *t = _eglGetCurrentThread();
 153    _EGLContext *ctx = _eglLookupContext(context);
 154    _EGLSurface *draw = _eglLookupSurface(d);
 155    _EGLSurface *read = _eglLookupSurface(r);
 156    _EGLContext *oldContext = NULL;
 157    _EGLSurface *oldDrawSurface = NULL;
 158    _EGLSurface *oldReadSurface = NULL;
 159    EGLint apiIndex;
 160
 161    if (_eglIsCurrentThreadDummy())
 162       return _eglError(EGL_BAD_ALLOC, "eglMakeCurrent");
 163
 164    /* error checking */
 165    if (ctx) {
 166       if (draw == NULL || read == NULL) {
 167          _eglError(EGL_BAD_MATCH, "eglMakeCurrent");
 168          return EGL_FALSE;
 169       }
 170       if (draw->Config != ctx->Config) {
 171          _eglError(EGL_BAD_MATCH, "eglMakeCurrent");
 172          return EGL_FALSE;
 173       }
 174       if (read->Config != ctx->Config) {
 175          _eglError(EGL_BAD_MATCH, "eglMakeCurrent");
 176          return EGL_FALSE;
 177       }
 178
 179 #ifdef EGL_VERSION_1_4
 180       /* OpenGL and OpenGL ES are conflicting */
 181       switch (ctx->ClientAPI) {
 182       case EGL_OPENGL_ES_API:
 183          if (t->CurrentContexts[_eglConvertApiToIndex(EGL_OPENGL_API)])
 184             return _eglError(EGL_BAD_ACCESS, "eglMakeCurrent");
 185          break;
 186       case EGL_OPENGL_API:
 187          if (t->CurrentContexts[_eglConvertApiToIndex(EGL_OPENGL_ES_API)])
 188             return _eglError(EGL_BAD_ACCESS, "eglMakeCurrent");
 189          break;
 190       default:
 191          break;
 192       }
 193 #endif
 194       apiIndex = _eglConvertApiToIndex(ctx->ClientAPI);
 195    }
 196    else {
 197       apiIndex = t->CurrentAPIIndex;
 198    }
 199
 200    oldContext = t->CurrentContexts[apiIndex];
 201    if (oldContext) {
 202       oldDrawSurface = oldContext->DrawSurface;
 203       oldReadSurface = oldContext->ReadSurface;
 204    }
 205
 206    /*
 207     * check if the old context or surfaces need to be deleted
 208     */
 209    if (oldDrawSurface != NULL) {
 210       oldDrawSurface->Binding = NULL;
 211       if (!_eglIsSurfaceLinked(oldDrawSurface)) {
 212          /* make sure we don't try to rebind a deleted surface */
 213          if (draw == oldDrawSurface || draw == oldReadSurface) {
 214             draw = NULL;
 215          }
 216          /* really delete surface now */
 217          drv->API.DestroySurface(drv, dpy, oldDrawSurface->Handle);
 218       }
 219    }
 220    if (oldReadSurface != NULL && oldReadSurface != oldDrawSurface) {
 221       oldReadSurface->Binding = NULL;
 222       if (!_eglIsSurfaceLinked(oldReadSurface)) {
 223          /* make sure we don't try to rebind a deleted surface */
 224          if (read == oldDrawSurface || read == oldReadSurface) {
 225             read = NULL;
 226          }
 227          /* really delete surface now */
 228          drv->API.DestroySurface(drv, dpy, oldReadSurface->Handle);
 229       }
 230    }
 231    if (oldContext != NULL) {
 232       oldContext->Binding = NULL;
 233       if (!_eglIsContextLinked(oldContext)) {
 234          /* make sure we don't try to rebind a deleted context */
 235          if (ctx == oldContext) {
 236             ctx = NULL;
 237          }
 238          /* really delete context now */
 239          drv->API.DestroyContext(drv, dpy, _eglGetContextHandle(oldContext));
 240       }
 241    }
 242
 243    if (ctx) {
 244       /* check read/draw again, in case we deleted them above */
 245       if (draw == NULL || read == NULL) {
 246          _eglError(EGL_BAD_MATCH, "eglMakeCurrent");
 247          return EGL_FALSE;
 248       }
 249       ctx->DrawSurface = draw;
 250       ctx->ReadSurface = read;
 251       ctx->Binding = t;
 252       draw->Binding = ctx;
 253       read->Binding = ctx;
 254       t->CurrentContexts[apiIndex] = ctx;
 255    }
 256    else {
 257       t->CurrentContexts[apiIndex] = NULL;
 258    }
 259
 260    return EGL_TRUE;
 261 }
 262
 263
 264 /**
 265  * This is defined by the EGL_MESA_copy_context extension.
 266  */
 267 EGLBoolean
 268 _eglCopyContextMESA(_EGLDriver *drv, EGLDisplay dpy, EGLContext source,
 269                     EGLContext dest, EGLint mask)
 270 {
 271    /* This function will always have to be overridden/implemented in the
 272     * device driver.  If the driver is based on Mesa, use _mesa_copy_context().
 273     */
 274    return EGL_FALSE;
 275 }