DRI2: add SwapBuffers support

Support the new DRI2 protocol request, DRI2SwapBuffers, in both direct
and indirect rendering context.  This request allows the display server
to optimize back->front swaps (e.g. through page flipping) and allows us
to more easily support other GLX features like swap interval and the OML
sync extension in DRI2.

Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>

3 files changed, 50 insertions, 1 deletions

diff --git a/src/glx/x11/dri2.c b/src/glx/x11/dri2.c
index dad04470a0..a0f8901d42 100644
--- a/src/glx/x11/dri2.c
+++ b/src/glx/x11/dri2.c
@@ -380,4 +380,20 @@ DRI2CopyRegion(Display * dpy, XID drawable, XserverRegion region,
    SyncHandle();
 }
 
+void DRI2SwapBuffers(Display *dpy, XID drawable)
+{
+    XExtDisplayInfo *info = DRI2FindDisplay(dpy);
+    xDRI2SwapBuffersReq *req;
+
+    XextSimpleCheckExtension (dpy, info, dri2ExtensionName);
+
+    LockDisplay(dpy);
+    GetReq(DRI2SwapBuffers, req);
+    req->reqType = info->codes->major_opcode;
+    req->dri2ReqType = X_DRI2SwapBuffers;
+    req->drawable = drawable;
+    UnlockDisplay(dpy);
+    SyncHandle();
+}
+
 #endif /* GLX_DIRECT_RENDERING */
diff --git a/src/glx/x11/dri2.h b/src/glx/x11/dri2.h
index a6fe66e136..ba6eff5e4f 100644
--- a/src/glx/x11/dri2.h
+++ b/src/glx/x11/dri2.h
@@ -85,4 +85,7 @@ DRI2CopyRegion(Display * dpy, XID drawable,
                XserverRegion region,
                CARD32 dest, CARD32 src);
 
+extern void
+DRI2SwapBuffers(Display *dpy, XID drawable);
+
 #endif
diff --git a/src/glx/x11/dri2_glx.c b/src/glx/x11/dri2_glx.c
index 89efe3ab29..114cad2ae7 100644
--- a/src/glx/x11/dri2_glx.c
+++ b/src/glx/x11/dri2_glx.c
@@ -35,6 +35,7 @@
 #include <X11/Xlib.h>
 #include <X11/extensions/Xfixes.h>
 #include <X11/extensions/Xdamage.h>
+#include "glapi.h"
 #include "glxclient.h"
 #include "glcontextmodes.h"
 #include "xf86dri.h"
@@ -64,6 +65,7 @@ struct __GLXDRIdisplayPrivateRec
    int driMajor;
    int driMinor;
    int driPatch;
+   int swapAvailable;
 };
 
 struct __GLXDRIcontextPrivateRec
@@ -240,7 +242,7 @@ dri2SwapBuffers(__GLXDRIdrawable * pdraw)
 }
 
 static void
-dri2WaitX(__GLXDRIdrawable * pdraw)
+dri2WaitX(__GLXDRIdrawable *pdraw)
 {
    __GLXDRIdrawablePrivate *priv = (__GLXDRIdrawablePrivate *) pdraw;
    XRectangle xrect;
@@ -342,6 +344,31 @@ process_buffers(__GLXDRIdrawablePrivate * pdraw, DRI2Buffer * buffers,
 
 }
 
+static void dri2SwapBuffers(__GLXDRIdrawable *pdraw)
+{
+    __GLXDRIdrawablePrivate *priv = (__GLXDRIdrawablePrivate *) pdraw;
+    __GLXdisplayPrivate *dpyPriv = __glXInitialize(priv->base.psc->dpy);
+    __GLXDRIdisplayPrivate *pdp =
+	(__GLXDRIdisplayPrivate *)dpyPriv->dri2Display;
+    __GLXscreenConfigs *psc = pdraw->psc;
+
+#ifdef __DRI2_FLUSH
+    if (pdraw->psc->f)
+    	(*pdraw->psc->f->flush)(pdraw->driDrawable);
+#endif
+
+    /* Old servers can't handle swapbuffers */
+    if (!pdp->swapAvailable)
+	return dri2CopySubBuffer(pdraw, 0, 0, priv->width, priv->height);
+
+    DRI2SwapBuffers(pdraw->psc->dpy, pdraw->drawable);
+
+#if __DRI2_FLUSH_VERSION >= 2
+    if (pdraw->psc->f)
+       (*pdraw->psc->f->flushInvalidate)(pdraw->driDrawable);
+#endif
+}
+
 static __DRIbuffer *
 dri2GetBuffers(__DRIdrawable * driDrawable,
                int *width, int *height,
@@ -559,6 +586,9 @@ dri2CreateDisplay(Display * dpy)
    }
 
    pdp->driPatch = 0;
+   pdp->swapAvailable = 0;
+   if (pdp->driMinor >= 2)
+      pdp->swapAvailable = 1;
 
    pdp->base.destroyDisplay = dri2DestroyDisplay;
    pdp->base.createScreen = dri2CreateScreen;