GLX/DRI2: add INTEL_swap_event support

This allows clients to easily check for swap completion status in their
main loop.

Reviewed-by: Kristian Høgsberg <krh@bitplanet.net>
Reviewed-by: Adam Jackson <ajax@nwnk.net>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>

6 files changed, 49 insertions, 1 deletions

diff --git a/glx/extension_string.c b/glx/extension_string.c
index 9d110cf98..7721cb056 100644
--- a/glx/extension_string.c
+++ b/glx/extension_string.c
@@ -82,6 +82,7 @@ static const struct extension_info known_glx_extensions[] = {
    { GLX(SGIX_fbconfig),               VER(1,3), Y, },
    { GLX(SGIX_pbuffer),                VER(1,3), Y, },
    { GLX(SGIX_visual_select_group),    VER(0,0), Y, },
+   { GLX(INTEL_swap_event),            VER(1,4), N, },
    { NULL }
 };
 
diff --git a/glx/extension_string.h b/glx/extension_string.h
index 98e91bc18..912534a04 100644
--- a/glx/extension_string.h
+++ b/glx/extension_string.h
@@ -50,6 +50,7 @@ enum {
    SGIX_fbconfig_bit,
    SGIX_pbuffer_bit,
    SGIX_visual_select_group_bit,
+   INTEL_swap_event_bit,
    __NUM_GLX_EXTS,
 };
 
diff --git a/glx/glxdri2.c b/glx/glxdri2.c
index 58e4684fe..69fd39b3b 100644
--- a/glx/glxdri2.c
+++ b/glx/glxdri2.c
@@ -167,6 +167,43 @@ __glXDRIdrawableWaitGL(__GLXdrawable *drawable)
 		   DRI2BufferFrontLeft, DRI2BufferFakeFrontLeft);
 }
 
+static void
+__glXdriSwapEvent(ClientPtr client, void *data, int type, CARD64 ust,
+		  CARD64 msc, CARD64 sbc)
+{
+    __GLXdrawable *drawable = data;
+    xGLXBufferSwapComplete wire;
+
+    if (!drawable->eventMask & GLX_BUFFER_SWAP_COMPLETE_INTEL_MASK)
+	return;
+
+    wire.type = __glXEventBase + GLX_BufferSwapComplete;
+    switch (type) {
+    case DRI2_EXCHANGE_COMPLETE:
+	wire.event_type = GLX_EXCHANGE_COMPLETE_INTEL;
+	break;
+    case DRI2_BLIT_COMPLETE:
+	wire.event_type = GLX_BLIT_COMPLETE_INTEL;
+	break;
+    case DRI2_FLIP_COMPLETE:
+	wire.event_type = GLX_FLIP_COMPLETE_INTEL;
+	break;
+    default:
+	/* unknown swap completion type */
+	break;
+    }
+    wire.sequenceNumber = client->sequence;
+    wire.drawable = drawable->drawId;
+    wire.ust_hi = ust >> 32;
+    wire.ust_lo = ust & 0xffffffff;
+    wire.msc_hi = msc >> 32;
+    wire.msc_lo = msc & 0xffffffff;
+    wire.sbc_hi = sbc >> 32;
+    wire.sbc_lo = sbc & 0xffffffff;
+
+    WriteEventsToClient(client, 1, (xEvent *) &wire);
+}
+
 /*
  * Copy or flip back to front, honoring the swap interval if possible.
  *
@@ -184,7 +221,7 @@ __glXDRIdrawableSwapBuffers(ClientPtr client, __GLXdrawable *drawable)
 	(*screen->flush->flushInvalidate)(priv->driDrawable);
 
     if (DRI2SwapBuffers(client, drawable->pDraw, 0, 0, 0, &unused,
-			NULL, drawable->pDraw) != Success)
+			__glXdriSwapEvent, drawable->pDraw) != Success)
 	return FALSE;
 
     return TRUE;
@@ -581,6 +618,10 @@ initializeExtensions(__GLXDRIscreen *screen)
 			 "GLX_MESA_copy_sub_buffer");
     LogMessage(X_INFO, "AIGLX: enabled GLX_MESA_copy_sub_buffer\n");
 
+    /* FIXME: only if DDX supports it */
+    __glXEnableExtension(screen->glx_enable_bits, "GLX_INTEL_swap_event");
+    LogMessage(X_INFO, "AIGLX: enabled GLX_INTEL_swap_event\n");
+
     for (i = 0; extensions[i]; i++) {
 #ifdef __DRI_READ_DRAWABLE
 	if (strcmp(extensions[i]->name, __DRI_READ_DRAWABLE) == 0) {
diff --git a/glx/glxext.c b/glx/glxext.c
index 913c624f2..59bcfbed2 100644
--- a/glx/glxext.c
+++ b/glx/glxext.c
@@ -267,6 +267,7 @@ GLboolean __glXErrorOccured(void)
 }
 
 static int __glXErrorBase;
+int __glXEventBase;
 
 int __glXError(int error)
 {
@@ -403,6 +404,7 @@ void GlxExtensionInit(void)
     }
 
     __glXErrorBase = extEntry->errorBase;
+    __glXEventBase = extEntry->eventBase;
 }
 
 /************************************************************************/
diff --git a/glx/glxscreens.c b/glx/glxscreens.c
index 674e2c681..58d8ee0b4 100644
--- a/glx/glxscreens.c
+++ b/glx/glxscreens.c
@@ -181,6 +181,7 @@ static char GLXServerExtensions[] =
 			"GLX_SGIX_fbconfig "
 			"GLX_SGIX_pbuffer "
 			"GLX_MESA_copy_sub_buffer "
+                        "GLX_INTEL_swap_event"
 			;
 
 /*
diff --git a/glx/glxserver.h b/glx/glxserver.h
index 10c4889e1..1daf97758 100644
--- a/glx/glxserver.h
+++ b/glx/glxserver.h
@@ -249,4 +249,6 @@ extern int __glXImageSize(GLenum format, GLenum type,
 extern unsigned glxMajorVersion;
 extern unsigned glxMinorVersion;
 
+extern int __glXEventBase;
+
 #endif /* !__GLX_server_h__ */