From 63b51b5cf17ddde09b72a2811296f37b9a4c5ad2 Mon Sep 17 00:00:00 2001
From: Alan Hourihane <alanh@vmware.com>
Date: Mon, 16 Feb 2009 11:44:40 +0000
Subject: dri2: support glXWaitX & glXWaitGL by using fake front buffer.

---
 src/glx/x11/dri2_glx.c | 59 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 59 insertions(+)

(limited to 'src/glx/x11/dri2_glx.c')

diff --git a/src/glx/x11/dri2_glx.c b/src/glx/x11/dri2_glx.c
index b878f05dda..776a14f614 100644
--- a/src/glx/x11/dri2_glx.c
+++ b/src/glx/x11/dri2_glx.c
@@ -77,6 +77,9 @@ struct __GLXDRIdrawablePrivateRec {
     int bufferCount;
     int width, height;
     unsigned long configureSeqno;
+    int have_back;
+    int have_front;
+    int have_fake_front;
 };
 
 static void dri2DestroyContext(__GLXDRIcontext *context,
@@ -196,6 +199,10 @@ static void dri2CopySubBuffer(__GLXDRIdrawable *pdraw,
     XRectangle xrect;
     XserverRegion region;
 
+    /* Check we have the right attachments */
+    if (!(priv->have_front && priv->have_back))
+    	return;
+
     xrect.x = x;
     xrect.y = priv->height - y - height;
     xrect.width = width;
@@ -214,6 +221,47 @@ static void dri2SwapBuffers(__GLXDRIdrawable *pdraw)
     dri2CopySubBuffer(pdraw, 0, 0, priv->width, priv->height);
 }
 
+static void dri2WaitX(__GLXDRIdrawable *pdraw)
+{
+    __GLXDRIdrawablePrivate *priv = (__GLXDRIdrawablePrivate *) pdraw;
+    XRectangle xrect;
+    XserverRegion region;
+
+    /* Check we have the right attachments */
+    if (!(priv->have_fake_front && priv->have_front))
+    	return;
+
+    xrect.x = 0;
+    xrect.y = 0;
+    xrect.width = priv->width;
+    xrect.height = priv->height;
+
+    region = XFixesCreateRegion(pdraw->psc->dpy, &xrect, 1);
+    DRI2CopyRegion(pdraw->psc->dpy, pdraw->drawable, region,
+		   DRI2BufferFakeFrontLeft, DRI2BufferFrontLeft);
+    XFixesDestroyRegion(pdraw->psc->dpy, region);
+}
+
+static void dri2WaitGL(__GLXDRIdrawable *pdraw)
+{
+    __GLXDRIdrawablePrivate *priv = (__GLXDRIdrawablePrivate *) pdraw;
+    XRectangle xrect;
+    XserverRegion region;
+
+    if (!(priv->have_fake_front && priv->have_front))
+    	return;
+
+    xrect.x = 0;
+    xrect.y = 0;
+    xrect.width = priv->width;
+    xrect.height = priv->height;
+
+    region = XFixesCreateRegion(pdraw->psc->dpy, &xrect, 1);
+    DRI2CopyRegion(pdraw->psc->dpy, pdraw->drawable, region,
+		   DRI2BufferFrontLeft, DRI2BufferFakeFrontLeft);
+    XFixesDestroyRegion(pdraw->psc->dpy, region);
+}
+
 static void dri2DestroyScreen(__GLXscreenConfigs *psc)
 {
     /* Free the direct rendering per screen data */
@@ -261,6 +309,9 @@ dri2GetBuffers(__DRIdrawable *driDrawable,
     pdraw->width = *width;
     pdraw->height = *height;
     pdraw->bufferCount = *out_count;
+    pdraw->have_front = 0;
+    pdraw->have_fake_front = 0;
+    pdraw->have_back = 0;
 
     /* This assumes the DRI2 buffer attachment tokens matches the
      * __DRIbuffer tokens. */
@@ -270,6 +321,12 @@ dri2GetBuffers(__DRIdrawable *driDrawable,
 	pdraw->buffers[i].pitch = buffers[i].pitch;
 	pdraw->buffers[i].cpp = buffers[i].cpp;
 	pdraw->buffers[i].flags = buffers[i].flags;
+	if (pdraw->buffers[i].attachment == __DRI_BUFFER_FRONT_LEFT)
+	    pdraw->have_front = 1;
+	if (pdraw->buffers[i].attachment == __DRI_BUFFER_FAKE_FRONT_LEFT)
+	    pdraw->have_fake_front = 1;
+	if (pdraw->buffers[i].attachment == __DRI_BUFFER_BACK_LEFT)
+	    pdraw->have_back = 1;
     }
 
     Xfree(buffers);
@@ -366,6 +423,8 @@ static __GLXDRIscreen *dri2CreateScreen(__GLXscreenConfigs *psc, int screen,
     psp->createContext = dri2CreateContext;
     psp->createDrawable = dri2CreateDrawable;
     psp->swapBuffers = dri2SwapBuffers;
+    psp->waitGL = dri2WaitGL;
+    psp->waitX = dri2WaitX;
 
     /* DRI2 suports SubBuffer through DRI2CopyRegion, so it's always
      * available.*/
-- 
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