[Mesa-dev] [PATCH 4/6] glx: Lift sending the MakeCurrent request to top-level code
Adam Jackson
ajax at redhat.com
Tue Nov 14 20:13:04 UTC 2017
Somewhat terrifyingly, we never sent this for direct contexts, which
means the server never knew the context/drawable bindings.
To handle this sanely, pull the request code up out of the indirect
backend, and rewrite the context switch path to call it as appropriate.
This attempts to preserve the existing behavior of not calling unbind()
on the context if its refcount would not drop to zero, which is why the
diff is a little uglier than I'd like.
Signed-off-by: Adam Jackson <ajax at redhat.com>
---
src/glx/glxcurrent.c | 181 +++++++++++++++++++++++++++++++++++++------------
src/glx/indirect_glx.c | 125 ++++------------------------------
2 files changed, 151 insertions(+), 155 deletions(-)
diff --git a/src/glx/glxcurrent.c b/src/glx/glxcurrent.c
index 9f8bf7cee1..7ee8a04a60 100644
--- a/src/glx/glxcurrent.c
+++ b/src/glx/glxcurrent.c
@@ -165,17 +165,85 @@ glXGetCurrentDrawable(void)
return gc->currentDrawable;
}
-/**
- * Make a particular context current.
- *
- * \note This is in this file so that it can access dummyContext.
- */
+static Bool
+SendMakeCurrentRequest(Display * dpy, GLXContextID gc_id,
+ GLXContextTag gc_tag, GLXDrawable draw,
+ GLXDrawable read, GLXContextTag *out_tag)
+{
+ xGLXMakeCurrentReply reply;
+ Bool ret;
+ int opcode = __glXSetupForCommand(dpy);
+
+ LockDisplay(dpy);
+
+ if (draw == read) {
+ xGLXMakeCurrentReq *req;
+
+ GetReq(GLXMakeCurrent, req);
+ req->reqType = opcode;
+ req->glxCode = X_GLXMakeCurrent;
+ req->drawable = draw;
+ req->context = gc_id;
+ req->oldContextTag = gc_tag;
+ }
+ else {
+ struct glx_display *priv = __glXInitialize(dpy);
+
+ if ((priv->majorVersion > 1) || (priv->minorVersion >= 3)) {
+ xGLXMakeContextCurrentReq *req;
+
+ GetReq(GLXMakeContextCurrent, req);
+ req->reqType = opcode;
+ req->glxCode = X_GLXMakeContextCurrent;
+ req->drawable = draw;
+ req->readdrawable = read;
+ req->context = gc_id;
+ req->oldContextTag = gc_tag;
+ }
+ else {
+ xGLXVendorPrivateWithReplyReq *vpreq;
+ xGLXMakeCurrentReadSGIReq *req;
+
+ GetReqExtra(GLXVendorPrivateWithReply,
+ sz_xGLXMakeCurrentReadSGIReq -
+ sz_xGLXVendorPrivateWithReplyReq, vpreq);
+ req = (xGLXMakeCurrentReadSGIReq *) vpreq;
+ req->reqType = opcode;
+ req->glxCode = X_GLXVendorPrivateWithReply;
+ req->vendorCode = X_GLXvop_MakeCurrentReadSGI;
+ req->drawable = draw;
+ req->readable = read;
+ req->context = gc_id;
+ req->oldContextTag = gc_tag;
+ }
+ }
+
+ ret = _XReply(dpy, (xReply *) &reply, 0, False);
+
+ if (out_tag)
+ *out_tag = reply.contextTag;
+
+ UnlockDisplay(dpy);
+ SyncHandle();
+
+ return ret;
+}
+
+static void
+SetGC(struct glx_context *gc, Display *dpy, GLXDrawable draw, GLXDrawable read)
+{
+ gc->currentDpy = dpy;
+ gc->currentDrawable = draw;
+ gc->currentReadable = read;
+}
+
static Bool
MakeContextCurrent(Display * dpy, GLXDrawable draw,
GLXDrawable read, GLXContext gc_user)
{
struct glx_context *gc = (struct glx_context *) gc_user;
struct glx_context *oldGC = __glXGetCurrentContext();
+ Bool ret = GL_FALSE;
/* Make sure that the new context has a nonzero ID. In the request,
* a zero context ID is used only to mean that we bind to no current
@@ -186,59 +254,86 @@ MakeContextCurrent(Display * dpy, GLXDrawable draw,
}
_glapi_check_multithread();
-
__glXLock();
+
+ /* Same context and drawables: no op, just return */
if (oldGC == gc &&
- gc->currentDrawable == draw && gc->currentReadable == read) {
- __glXUnlock();
- return True;
+ gc->currentDrawable == draw &&
+ gc->currentReadable == read) {
+ ret = GL_TRUE;
}
- if (oldGC != &dummyContext) {
- if (--oldGC->thread_refcount == 0) {
- oldGC->vtable->unbind(oldGC, gc);
- oldGC->currentDpy = 0;
+ /* Same context and new drawbles: update drawable bindings */
+ else if (oldGC == gc) {
+ if (!SendMakeCurrentRequest(dpy, gc->xid, gc->currentContextTag,
+ draw, read, &gc->currentContextTag)) {
+ goto out;
}
- }
- if (gc) {
- /* Attempt to bind the context. We do this before mucking with
- * gc and __glXSetCurrentContext to properly handle our state in
- * case of an error.
- *
- * If an error occurs, set the Null context since we've already
- * blown away our old context. The caller is responsible for
- * figuring out how to handle setting a valid context.
- */
- if (gc->vtable->bind(gc, oldGC, draw, read) != Success) {
+ if (gc->vtable->bind(gc, gc, draw, read) != Success) {
__glXSetCurrentContextNull();
- __glXUnlock();
- __glXSendError(dpy, GLXBadContext, None, X_GLXMakeContextCurrent,
- False);
- return GL_FALSE;
+ goto out;
}
+ }
- if (gc->thread_refcount == 0) {
- gc->currentDpy = dpy;
- gc->currentDrawable = draw;
- gc->currentReadable = read;
+ /* Different contexts: release the old, bind the new */
+ else {
+ if (oldGC != &dummyContext) {
+ if (--oldGC->thread_refcount == 0) {
+ if (!SendMakeCurrentRequest(dpy, None, oldGC->currentContextTag,
+ None, None, &oldGC->currentContextTag)){
+ goto out;
+ }
+
+ oldGC->vtable->unbind(oldGC, gc);
+
+ if (!oldGC->xid == None) {
+ /* destroyed context, free it */
+ oldGC->vtable->destroy(oldGC);
+ } else {
+ SetGC(oldGC, NULL, None, None);
+ }
+ }
}
- gc->thread_refcount++;
- __glXSetCurrentContext(gc);
- } else {
__glXSetCurrentContextNull();
- }
- if (oldGC->thread_refcount == 0 && oldGC != &dummyContext && oldGC->xid == None) {
- /* We are switching away from a context that was
- * previously destroyed, so we need to free the memory
- * for the old handle. */
- oldGC->vtable->destroy(oldGC);
+ if (gc) {
+ /*
+ * MESA_multithread_makecurrent makes this complicated. We need to send
+ * the request if the new context is
+ *
+ * a) indirect (may be current to another client), or
+ * b) (direct and) newly being made current, or
+ * c) (direct and) being bound to new drawables
+ */
+ Bool new_drawables = (gc->currentReadable != read) ||
+ (gc->currentDrawable != draw);
+
+ if (!gc->isDirect || !gc->thread_refcount || new_drawables) {
+ if (!SendMakeCurrentRequest(dpy, gc->xid, oldGC->currentContextTag,
+ draw, read, &gc->currentContextTag)) {
+ goto out;
+ }
+ }
+
+ if (gc->vtable->bind(gc, oldGC, draw, read) != Success) {
+ __glXSendError(dpy, GLXBadContext, None, X_GLXMakeContextCurrent,
+ False);
+ goto out;
+ }
+
+ if (gc->thread_refcount == 0) {
+ SetGC(gc, dpy, draw, read);
+ }
+ gc->thread_refcount++;
+ __glXSetCurrentContext(gc);
+ }
}
+ ret = GL_TRUE;
+out:
__glXUnlock();
-
- return GL_TRUE;
+ return ret;
}
diff --git a/src/glx/indirect_glx.c b/src/glx/indirect_glx.c
index b552b5768a..8ac8fd1b47 100644
--- a/src/glx/indirect_glx.c
+++ b/src/glx/indirect_glx.c
@@ -61,129 +61,30 @@ indirect_destroy_context(struct glx_context *gc)
free((char *) gc);
}
-static Bool
-SendMakeCurrentRequest(Display * dpy, GLXContextID gc_id,
- GLXContextTag gc_tag, GLXDrawable draw,
- GLXDrawable read, GLXContextTag *out_tag)
-{
- xGLXMakeCurrentReply reply;
- Bool ret;
- int opcode = __glXSetupForCommand(dpy);
-
- LockDisplay(dpy);
-
- if (draw == read) {
- xGLXMakeCurrentReq *req;
-
- GetReq(GLXMakeCurrent, req);
- req->reqType = opcode;
- req->glxCode = X_GLXMakeCurrent;
- req->drawable = draw;
- req->context = gc_id;
- req->oldContextTag = gc_tag;
- }
- else {
- struct glx_display *priv = __glXInitialize(dpy);
-
- /* If the server can support the GLX 1.3 version, we should
- * perfer that. Not only that, some servers support GLX 1.3 but
- * not the SGI extension.
- */
-
- if ((priv->majorVersion > 1) || (priv->minorVersion >= 3)) {
- xGLXMakeContextCurrentReq *req;
-
- GetReq(GLXMakeContextCurrent, req);
- req->reqType = opcode;
- req->glxCode = X_GLXMakeContextCurrent;
- req->drawable = draw;
- req->readdrawable = read;
- req->context = gc_id;
- req->oldContextTag = gc_tag;
- }
- else {
- xGLXVendorPrivateWithReplyReq *vpreq;
- xGLXMakeCurrentReadSGIReq *req;
-
- GetReqExtra(GLXVendorPrivateWithReply,
- sz_xGLXMakeCurrentReadSGIReq -
- sz_xGLXVendorPrivateWithReplyReq, vpreq);
- req = (xGLXMakeCurrentReadSGIReq *) vpreq;
- req->reqType = opcode;
- req->glxCode = X_GLXVendorPrivateWithReply;
- req->vendorCode = X_GLXvop_MakeCurrentReadSGI;
- req->drawable = draw;
- req->readable = read;
- req->context = gc_id;
- req->oldContextTag = gc_tag;
- }
- }
-
- ret = _XReply(dpy, (xReply *) &reply, 0, False);
-
- if (out_tag)
- *out_tag = reply.contextTag;
-
- UnlockDisplay(dpy);
- SyncHandle();
-
- return ret;
-}
-
static int
indirect_bind_context(struct glx_context *gc, struct glx_context *old,
GLXDrawable draw, GLXDrawable read)
{
- GLXContextTag tag;
- Display *dpy = gc->psc->dpy;
- Bool sent;
-
- if (old != &dummyContext && !old->isDirect && old->psc->dpy == dpy) {
- tag = old->currentContextTag;
- old->currentContextTag = 0;
- } else {
- tag = 0;
- }
-
- sent = SendMakeCurrentRequest(dpy, gc->xid, tag, draw, read,
- &gc->currentContextTag);
-
- if (sent) {
- if (!IndirectAPI)
- IndirectAPI = __glXNewIndirectAPI();
- _glapi_set_dispatch(IndirectAPI);
-
- /* The indirect vertex array state must to be initialised after we
- * have setup the context, as it needs to query server attributes.
- */
- __GLXattribute *state = gc->client_state_private;
- if (state && state->array_state == NULL) {
- glGetString(GL_EXTENSIONS);
- glGetString(GL_VERSION);
- __glXInitVertexArrayState(gc);
- }
+ if (!IndirectAPI)
+ IndirectAPI = __glXNewIndirectAPI();
+ _glapi_set_dispatch(IndirectAPI);
+
+ /* The indirect vertex array state must to be initialised after we
+ * have setup the context, as it needs to query server attributes.
+ */
+ __GLXattribute *state = gc->client_state_private;
+ if (state && state->array_state == NULL) {
+ glGetString(GL_EXTENSIONS);
+ glGetString(GL_VERSION);
+ __glXInitVertexArrayState(gc);
}
- return !sent;
+ return state != NULL && state->array_state != NULL;
}
static void
indirect_unbind_context(struct glx_context *gc, struct glx_context *new)
{
- Display *dpy = gc->psc->dpy;
-
- if (gc == new)
- return;
-
- /* We are either switching to no context, away from an indirect
- * context to a direct context or from one dpy to another and have
- * to send a request to the dpy to unbind the previous context.
- */
- if (!new || new->isDirect || new->psc->dpy != dpy) {
- SendMakeCurrentRequest(dpy, None, gc->currentContextTag, None, None,
- NULL);
- gc->currentContextTag = 0;
- }
}
static void
--
2.14.3
More information about the mesa-dev
mailing list