From 4258e3a2e1c3278694ed10f7fc544d2154d91a96 Mon Sep 17 00:00:00 2001
From: Kristian Høgsberg <krh@bitplanet.net>
Date: Tue, 11 May 2010 09:42:57 -0400
Subject: glx: Provide the __DRI_USE_INVALIDATE extension to the driver when we
 can

When we have DRI2 protocol at least 2.3, we get an event from the
server when the back buffers get invalidated.  When that's the case
let the driver know that it can rely on invalidate instead of the
glViewport polling.
---
 src/glx/dri2_glx.c | 39 +++++++++++++++++++++++++--------------
 1 file changed, 25 insertions(+), 14 deletions(-)

diff --git a/src/glx/dri2_glx.c b/src/glx/dri2_glx.c
index ca2a753cbb..eafb87c359 100644
--- a/src/glx/dri2_glx.c
+++ b/src/glx/dri2_glx.c
@@ -73,6 +73,8 @@ struct __GLXDRIdisplayPrivateRec
    int driPatch;
    int swapAvailable;
    int invalidateAvailable;
+
+   const __DRIextension *loader_extensions[4];
 };
 
 struct __GLXDRIcontextPrivateRec
@@ -536,17 +538,11 @@ static const __DRIdri2LoaderExtension dri2LoaderExtension_old = {
    NULL,
 };
 
-static const __DRIextension *loader_extensions[] = {
-   &dri2LoaderExtension.base,
-   &systemTimeExtension.base,
-   NULL
-};
-
-static const __DRIextension *loader_extensions_old[] = {
-   &dri2LoaderExtension_old.base,
-   &systemTimeExtension.base,
-   NULL
+#ifdef __DRI_USE_INVALIDATE
+static const __DRIuseInvalidateExtension dri2UseInvalidate = {
+   { __DRI_USE_INVALIDATE, __DRI_USE_INVALIDATE_VERSION }
 };
+#endif
 
 _X_HIDDEN void
 dri2InvalidateBuffers(Display *dpy, XID drawable)
@@ -622,13 +618,14 @@ dri2CreateScreen(__GLXscreenConfigs * psc, int screen,
       goto handle_error;
    }
 
+   
    /* If the server does not support the protocol for
     * DRI2GetBuffersWithFormat, don't supply that interface to the driver.
     */
    psc->__driScreen =
-      psc->dri2->createNewScreen(screen, psc->fd, ((pdp->driMinor < 1)
-						   ? loader_extensions_old
-						   : loader_extensions),
+      psc->dri2->createNewScreen(screen, psc->fd,
+				 (const __DRIextension **)
+				 &pdp->loader_extensions[0],
 				 &driver_configs, psc);
 
    if (psc->__driScreen == NULL) {
@@ -710,7 +707,7 @@ _X_HIDDEN __GLXDRIdisplay *
 dri2CreateDisplay(Display * dpy)
 {
    __GLXDRIdisplayPrivate *pdp;
-   int eventBase, errorBase;
+   int eventBase, errorBase, i;
 
    if (!DRI2QueryExtension(dpy, &eventBase, &errorBase))
       return NULL;
@@ -731,6 +728,20 @@ dri2CreateDisplay(Display * dpy)
    pdp->base.destroyDisplay = dri2DestroyDisplay;
    pdp->base.createScreen = dri2CreateScreen;
 
+   i = 0;
+   if (pdp->driMinor < 1)
+      pdp->loader_extensions[i++] = &dri2LoaderExtension_old.base;
+   else
+      pdp->loader_extensions[i++] = &dri2LoaderExtension.base;
+   
+   pdp->loader_extensions[i++] = &systemTimeExtension.base;
+
+#ifdef __DRI_USE_INVALIDATE
+   if (pdp->invalidateAvailable)
+      pdp->loader_extensions[i++] = &dri2UseInvalidate.base;
+   pdp->loader_extensions[i++] = NULL;
+#endif
+
    return &pdp->base;
 }
 
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