From fdefc2bbda9d76576a7473c7d76f9ac7c94ccc87 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Michel=20D=C3=A4nzer?= <michel@tungstengraphics.com>
Date: Tue, 10 Jul 2007 11:02:18 +0200
Subject: [PATCH] i915tex: Better procedure for dropping batchbuffer on virtual
 resolution change.

The previous procedure would often result in a GPU lockup.
---
 src/mesa/drivers/dri/i915tex/intel_context.c | 30 +++++++-------------
 1 file changed, 10 insertions(+), 20 deletions(-)

diff --git a/src/mesa/drivers/dri/i915tex/intel_context.c b/src/mesa/drivers/dri/i915tex/intel_context.c
index e1d35b7a9cf..093b3b416b4 100644
--- a/src/mesa/drivers/dri/i915tex/intel_context.c
+++ b/src/mesa/drivers/dri/i915tex/intel_context.c
@@ -669,37 +669,27 @@ intelContendedLock(struct intel_context *intel, GLuint flags)
    if (sarea->width != intel->width ||
        sarea->height != intel->height ||
        sarea->rotation != intel->current_rotation) {
-      
-      void *batchMap = intel->batch->map;
-      
+      int numClipRects = intel->numClipRects;
+
       /*
        * FIXME: Really only need to do this when drawing to a
        * common back- or front buffer.
        */
 
       /*
-       * This will drop the outstanding batchbuffer on the floor
+       * This will essentially drop the outstanding batchbuffer on the floor.
        */
+      intel->numClipRects = 0;
 
-      if (batchMap != NULL) {
-	 driBOUnmap(intel->batch->buffer);
-	 intel->batch->map = NULL;
-      }
+      if (intel->Fallback)
+	 _swrast_flush(&intel->ctx);
 
-      intel_batchbuffer_reset(intel->batch);
+      INTEL_FIREVERTICES(intel);
 
-      if (batchMap == NULL) {
-	 driBOUnmap(intel->batch->buffer);
-	 intel->batch->map = NULL;
-      }
+      if (intel->batch->map != intel->batch->ptr)
+	 intel_batchbuffer_flush(intel->batch);
 
-      /* lose all primitives */
-      intel->prim.primitive = ~0;
-      intel->prim.start_ptr = 0;
-      intel->prim.flush = 0;
-
-      /* re-emit all state */
-      intel->vtbl.lost_hardware(intel);
+      intel->numClipRects = numClipRects;
 
       /* force window update */
       intel->lastStamp = 0;