DDraw: Set the DDSCAPS2_MIPMAPSUBLEVEL flag on sublevels

[Stefan Dösinger]

The msdn mentiones that this flag is ignored when passed to CreateSurface and 
set for mipmap sublevels for convenience when calling GetAttachedSurface. The 
BBC Dinosaur world demo expects this.
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From 53795c53612d710cea8bbe1d10ddd8cd195fd7fb Mon Sep 17 00:00:00 2001
From: Stefan Doesinger <stefan at codeweavers.com>
Date: Mon, 9 Oct 2006 00:16:35 +0200
Subject: [PATCH] DDraw: Set DDSCAPS2_MIPMAPSUBLEVEL on mipmap sublevels
---
 dlls/ddraw/ddraw.c |    8 ++++++++
 1 files changed, 8 insertions(+), 0 deletions(-)

diff --git a/dlls/ddraw/ddraw.c b/dlls/ddraw/ddraw.c
index 594f434..a2177d2 100644
--- a/dlls/ddraw/ddraw.c
+++ b/dlls/ddraw/ddraw.c
@@ -2155,6 +2155,9 @@ IDirectDrawImpl_CreateSurface(IDirectDra
         return E_POINTER; /* unchecked */
     }
 
+    /* According to the msdn this flag is ignored by CreateSurface */
+    DDSD->ddsCaps.dwCaps2 &= ~DDSCAPS2_MIPMAPSUBLEVEL;
+
     /* Modify some flags */
     memset(&desc2, 0, sizeof(desc2));
     desc2.dwSize = sizeof(desc2);   /* For the struct copy */
@@ -2330,6 +2333,11 @@ IDirectDrawImpl_CreateSurface(IDirectDra
         desc2.ddsCaps.dwCaps &= ~DDSCAPS_FRONTBUFFER; /* It's not a front buffer */
         desc2.ddsCaps.dwCaps |= DDSCAPS_BACKBUFFER;
     }
+    /* Set the DDSCAPS2_MIPMAPSUBLEVEL flag on mipmap sublevels according to the msdn */
+    if(DDSD->ddsCaps.dwCaps & DDSCAPS_MIPMAP)
+    {
+        desc2.ddsCaps.dwCaps2 |= DDSCAPS2_MIPMAPSUBLEVEL;
+    }
 
     for(i = 0; i < extra_surfaces; i++)
     {
-- 
1.4.1.1