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egl: Fix eglMakeCurrent with different surfaces. 

0a82fadcdd seems to trigger a bug in
_eglBindContext.  Rework the logics yet again.  It is simpler, and
hopefully correct this time.
This commit is contained in:
Chia-I Wu 2010-04-05 21:26:34 +08:00
parent ffb6a8f552
commit bbe459b14d
1 changed files with 46 additions and 31 deletions
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77
src/egl/main/eglcontext.c
View File

@ -208,39 +208,56 @@ _eglQueryContext(_EGLDriver *drv, _EGLDisplay *dpy, _EGLContext *c,
* bound to; when the context is NULL, the same surfaces are returned.
*/
static void
_eglBindContextToSurfaces(_EGLContext *ctx,
_eglBindContextToSurfaces(_EGLContext *newCtx,
_EGLSurface **draw, _EGLSurface **read)
{
_EGLSurface *newDraw = *draw, *newRead = *read;
_EGLContext *oldCtx;
/*
* The goal is to bind a newCtx to newDraw. Since newDraw may already have
* a binding context (oldCtx), and newCtx may already be bound to another
* surface (oldDraw), the old bindings are broken first and the new one is
* created.
*/
oldCtx = newDraw->CurrentContext;
if (ctx != oldCtx) {
if (newCtx != oldCtx) {
if (oldCtx) {
assert(*draw == oldCtx->DrawSurface);
assert(oldCtx->DrawSurface == newDraw);
oldCtx->DrawSurface = NULL;
}
if (ctx) {
*draw = ctx->DrawSurface;
ctx->DrawSurface = newDraw;
if (newCtx) {
_EGLSurface *oldDraw = newCtx->DrawSurface;
if (oldDraw)
oldDraw->CurrentContext = NULL;
newCtx->DrawSurface = newDraw;
*draw = oldDraw;
}
newDraw->CurrentContext = ctx;
newDraw->CurrentContext = newCtx;
}
/* likewise */
if (newRead != newDraw)
oldCtx = newRead->CurrentContext;
if (ctx != oldCtx) {
if (newCtx != oldCtx) {
if (oldCtx) {
assert(*read == oldCtx->ReadSurface);
assert(oldCtx->ReadSurface == newRead);
oldCtx->ReadSurface = NULL;
}
if (ctx) {
*read = ctx->ReadSurface;
ctx->ReadSurface = newRead;
if (newCtx) {
_EGLSurface *oldRead = newCtx->ReadSurface;
if (oldRead)
oldRead->CurrentContext = NULL;
newCtx->ReadSurface = newRead;
*read = oldRead;
}
newRead->CurrentContext = ctx;
newRead->CurrentContext = newCtx;
}
}
@ -360,26 +377,24 @@ _eglBindContext(_EGLContext **ctx, _EGLSurface **draw, _EGLSurface **read)
/* bind the new context */
oldCtx = _eglBindContextToThread(newCtx, t);
*ctx = oldCtx;
if (newCtx)
if (newCtx) {
_eglBindContextToSurfaces(newCtx, draw, read);
/* unbind the old context from its binding surfaces */
if (oldCtx && oldCtx != newCtx) {
/*
* If the new context replaces some old context, the new one should not
* be current before the replacement and it should not be bound to any
* surface.
*/
if (newCtx)
assert(!*draw && !*read);
*draw = oldCtx->DrawSurface;
*read = oldCtx->ReadSurface;
assert(*draw && *read);
_eglBindContextToSurfaces(NULL, draw, read);
}
else {
assert(!*draw && !*read);
if (oldCtx) {
*draw = oldCtx->DrawSurface;
*read = oldCtx->ReadSurface;
assert(*draw && *read);
/* unbind the old context from its surfaces */
_eglBindContextToSurfaces(NULL, draw, read);
}
}
*ctx = oldCtx;
/* draw and read have been updated in _eglBindContextToSurfaces */
return EGL_TRUE;
}