Mesa (master): glx: add support for a reallyFlush() function before swap occurs.

[Alan Hourihane]

Module: Mesa
Branch: master
Commit: 65562453fba69e862d5e3b381d18db9c40d9353c
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=65562453fba69e862d5e3b381d18db9c40d9353c

Author: Alan Hourihane <alanh at vmware.com>
Date:   Thu Feb 19 18:39:08 2009 +0000

glx: add support for a reallyFlush() function before swap occurs.

---

 include/GL/internal/dri_interface.h |   11 +++++++++++
 src/glx/x11/dri2_glx.c              |   16 ++++++++++++++++
 src/glx/x11/dri_common.c            |    7 +++++++
 src/glx/x11/glxclient.h             |    4 ++++
 4 files changed, 38 insertions(+), 0 deletions(-)

diff --git a/include/GL/internal/dri_interface.h b/include/GL/internal/dri_interface.h
index 27cc1be..a726b93 100644
--- a/include/GL/internal/dri_interface.h
+++ b/include/GL/internal/dri_interface.h
@@ -78,6 +78,7 @@ typedef struct __DRIswrastExtensionRec		__DRIswrastExtension;
 typedef struct __DRIbufferRec			__DRIbuffer;
 typedef struct __DRIdri2ExtensionRec		__DRIdri2Extension;
 typedef struct __DRIdri2LoaderExtensionRec	__DRIdri2LoaderExtension;
+typedef struct __DRI2flushExtensionRec	__DRI2flushExtension;
 
 /*@}*/
 
@@ -245,6 +246,16 @@ struct __DRItexBufferExtensionRec {
 			 __DRIdrawable *pDraw);
 };
 
+/**
+ * Used by drivers that implement DRI2
+ */
+#define __DRI2_FLUSH "DRI2_Flush"
+#define __DRI2_FLUSH_VERSION 1
+struct __DRI2flushExtensionRec {
+    __DRIextension base;
+    void (*flush)(__DRIdrawable *drawable);
+};
+
 
 /**
  * XML document describing the configuration options supported by the
diff --git a/src/glx/x11/dri2_glx.c b/src/glx/x11/dri2_glx.c
index 776a14f..0ef5d3a 100644
--- a/src/glx/x11/dri2_glx.c
+++ b/src/glx/x11/dri2_glx.c
@@ -208,7 +208,13 @@ static void dri2CopySubBuffer(__GLXDRIdrawable *pdraw,
     xrect.width = width;
     xrect.height = height;
 
+#ifdef __DRI2_FLUSH
+    if (pdraw->psc->f)
+    	(*pdraw->psc->f->flush)(pdraw->driDrawable);
+#endif
+
     region = XFixesCreateRegion(pdraw->psc->dpy, &xrect, 1);
+    /* should get a fence ID back from here at some point */
     DRI2CopyRegion(pdraw->psc->dpy, pdraw->drawable, region,
 		   DRI2BufferFrontLeft, DRI2BufferBackLeft);
     XFixesDestroyRegion(pdraw->psc->dpy, region);
@@ -236,6 +242,11 @@ static void dri2WaitX(__GLXDRIdrawable *pdraw)
     xrect.width = priv->width;
     xrect.height = priv->height;
 
+#ifdef __DRI2_FLUSH
+    if (pdraw->psc->f)
+    	(*pdraw->psc->f->flush)(pdraw->driDrawable);
+#endif
+
     region = XFixesCreateRegion(pdraw->psc->dpy, &xrect, 1);
     DRI2CopyRegion(pdraw->psc->dpy, pdraw->drawable, region,
 		   DRI2BufferFakeFrontLeft, DRI2BufferFrontLeft);
@@ -256,6 +267,11 @@ static void dri2WaitGL(__GLXDRIdrawable *pdraw)
     xrect.width = priv->width;
     xrect.height = priv->height;
 
+#ifdef __DRI2_FLUSH
+    if (pdraw->psc->f)
+    	(*pdraw->psc->f->flush)(pdraw->driDrawable);
+#endif
+
     region = XFixesCreateRegion(pdraw->psc->dpy, &xrect, 1);
     DRI2CopyRegion(pdraw->psc->dpy, pdraw->drawable, region,
 		   DRI2BufferFrontLeft, DRI2BufferFakeFrontLeft);
diff --git a/src/glx/x11/dri_common.c b/src/glx/x11/dri_common.c
index 4fda649..90c3d8c 100644
--- a/src/glx/x11/dri_common.c
+++ b/src/glx/x11/dri_common.c
@@ -392,6 +392,13 @@ driBindExtensions(__GLXscreenConfigs *psc, int dri2)
 	}
 #endif
 
+#ifdef __DRI2_FLUSH
+	if ((strcmp(extensions[i]->name, __DRI2_FLUSH) == 0) && dri2) {
+	    psc->f = (__DRI2flushExtension *) extensions[i];
+	    /* internal driver extension, no GL extension exposed */
+	}
+#endif
+
 	/* Ignore unknown extensions */
     }
 }
diff --git a/src/glx/x11/glxclient.h b/src/glx/x11/glxclient.h
index 3e70759..caf58bb 100644
--- a/src/glx/x11/glxclient.h
+++ b/src/glx/x11/glxclient.h
@@ -519,6 +519,10 @@ struct __GLXscreenConfigsRec {
     const __DRItexBufferExtension *texBuffer;
 #endif
 
+#ifdef __DRI2_FLUSH
+    const __DRI2flushExtension *f;
+#endif
+
 #endif
 
     /**