wined3d: Ensure that wined3d_cs_st_require_space allocates the required space

[Sebastian Lackner]

The current implementation of wined3d_cs_st_require_space just doubles
the previous buffer size, but doesn't ensure that this is really sufficient:

> if (!(new_data = HeapReAlloc(GetProcessHeap(), 0, cs->data,
cs->data_size * 2)))

This patch adds a while() loop to ensure that the buffer is big enough.

---
 dlls/wined3d/cs.c |    9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)
-------------- next part --------------
>From fd160b79c48fc20ae383450d9d9fe09a7280b465 Mon Sep 17 00:00:00 2001
From: Sebastian Lackner <sebastian at fds-team.de>
Date: Tue, 1 Oct 2013 19:58:54 +0200
Subject: wined3d: Ensure that wined3d_cs_st_require_space allocates the
 required space

---
 dlls/wined3d/cs.c |    9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/dlls/wined3d/cs.c b/dlls/wined3d/cs.c
index b9f2929..28333f2 100644
--- a/dlls/wined3d/cs.c
+++ b/dlls/wined3d/cs.c
@@ -212,11 +212,16 @@ static void *wined3d_cs_st_require_space(struct wined3d_cs *cs, size_t size)
     if (size > cs->data_size)
     {
         void *new_data;
+        size_t new_size;
 
-        if (!(new_data = HeapReAlloc(GetProcessHeap(), 0, cs->data, cs->data_size * 2)))
+        new_size = cs->data_size * 2;
+        while (size > new_size)
+            new_size *= 2;
+
+        if (!(new_data = HeapReAlloc(GetProcessHeap(), 0, cs->data, new_size)))
             return NULL;
 
-        cs->data_size *= 2;
+        cs->data_size = new_size;
         cs->data = new_data;
     }
 
-- 
1.7.9.5