From 7d11a392d780ef7f0374f8da87e3ba416d880cf2 Mon Sep 17 00:00:00 2001
From: Jakob Bornecrantz <jakob@vmware.com>
Date: Mon, 18 May 2009 02:50:15 +0100
Subject: [PATCH] st/dri: Only create new textures if drawable has changed

---
 src/gallium/state_trackers/dri/dri_drawable.c | 12 ++++++++++++
 src/gallium/state_trackers/dri/dri_drawable.h |  5 +++++
 2 files changed, 17 insertions(+)

diff --git a/src/gallium/state_trackers/dri/dri_drawable.c b/src/gallium/state_trackers/dri/dri_drawable.c
index 15a2088df51..865cc8d0b6c 100644
--- a/src/gallium/state_trackers/dri/dri_drawable.c
+++ b/src/gallium/state_trackers/dri/dri_drawable.c
@@ -138,6 +138,18 @@ dri_get_buffers(__DRIdrawablePrivate * dPriv)
    dri_drawable->pBackClipRects[0].x2 = dri_drawable->w;
    dri_drawable->pBackClipRects[0].y2 = dri_drawable->h;
 
+   if (drawable->old_num == count &&
+       drawable->old_w == dri_drawable->w &&
+       drawable->old_h == dri_drawable->h &&
+       memcmp(drawable->old, buffers, sizeof(__DRIbuffer) * count) == 0) {
+       return;
+   } else {
+      drawable->old_num = count;
+      drawable->old_w = dri_drawable->w;
+      drawable->old_h = dri_drawable->h;
+      memcpy(drawable->old, buffers, sizeof(__DRIbuffer) * count);
+   }
+
    for (i = 0; i < count; i++) {
       enum pipe_format format = 0;
       int index = 0;
diff --git a/src/gallium/state_trackers/dri/dri_drawable.h b/src/gallium/state_trackers/dri/dri_drawable.h
index 78a66624aaf..0f654d804a7 100644
--- a/src/gallium/state_trackers/dri/dri_drawable.h
+++ b/src/gallium/state_trackers/dri/dri_drawable.h
@@ -46,6 +46,11 @@ struct dri_drawable
    unsigned attachments[8];
    unsigned num_attachments;
 
+   __DRIbuffer old[8];
+   unsigned old_num;
+   unsigned old_w;
+   unsigned old_h;
+
    /* gallium */
    struct st_framebuffer *stfb;
    struct pipe_fence_handle *swap_fences[DRI_SWAP_FENCES_MAX];
-- 
2.30.2