From 8aa5c86386f695111fd5bb3bef7673693b59321c Mon Sep 17 00:00:00 2001
From: SarahW <SarahW@localhost>
Date: Wed, 7 Jun 2017 17:56:32 +0100
Subject: [PATCH] DirectDraw code now falls back to backbuffer in system memory
 if it can't allocate backbuffer in video memory.

---
 src/win-ddraw-fs.cc |  9 ++++++++-
 src/win-ddraw.cc    | 18 ++++++++++++++++--
 2 files changed, 24 insertions(+), 3 deletions(-)

diff --git a/src/win-ddraw-fs.cc b/src/win-ddraw-fs.cc
index bc581e3..aa929a0 100644
--- a/src/win-ddraw-fs.cc
+++ b/src/win-ddraw-fs.cc
@@ -72,7 +72,14 @@ void ddraw_fs_init(HWND h)
         ddsd.dwHeight = 2048;
         ddsd.ddsCaps.dwCaps = DDSCAPS_OFFSCREENPLAIN | DDSCAPS_VIDEOMEMORY;
         if (FAILED(lpdd4->CreateSurface(&ddsd, &lpdds_back, NULL)))
-           fatal("CreateSurface back failed\n");
+        {
+                ddsd.dwFlags = DDSD_CAPS | DDSD_WIDTH | DDSD_HEIGHT;
+                ddsd.dwWidth  = 2048;
+                ddsd.dwHeight = 2048;
+                ddsd.ddsCaps.dwCaps = DDSCAPS_OFFSCREENPLAIN | DDSCAPS_SYSTEMMEMORY;
+                if (FAILED(lpdd4->CreateSurface(&ddsd, &lpdds_back, NULL)))
+                        fatal("CreateSurface back failed\n");
+        }
            
         pclog("DDRAW_INIT complete\n");
         ddraw_hwnd = h;
diff --git a/src/win-ddraw.cc b/src/win-ddraw.cc
index 2cd0864..88b4756 100644
--- a/src/win-ddraw.cc
+++ b/src/win-ddraw.cc
@@ -59,7 +59,14 @@ void ddraw_init(HWND h)
         ddsd.dwHeight = 2048;
         ddsd.ddsCaps.dwCaps = DDSCAPS_OFFSCREENPLAIN | DDSCAPS_VIDEOMEMORY;
         if (FAILED(lpdd4->CreateSurface(&ddsd, &lpdds_back, NULL)))
-           fatal("CreateSurface back failed\n");
+        {
+                ddsd.dwFlags = DDSD_CAPS | DDSD_WIDTH | DDSD_HEIGHT;
+                ddsd.dwWidth  = 2048;
+                ddsd.dwHeight = 2048;
+                ddsd.ddsCaps.dwCaps = DDSCAPS_OFFSCREENPLAIN | DDSCAPS_SYSTEMMEMORY;
+                if (FAILED(lpdd4->CreateSurface(&ddsd, &lpdds_back, NULL)))
+                        fatal("CreateSurface back failed\n");
+        }
 
         memset(&ddsd, 0, sizeof(ddsd));
         ddsd.dwSize = sizeof(ddsd);
@@ -69,7 +76,14 @@ void ddraw_init(HWND h)
         ddsd.dwHeight = 2048;
         ddsd.ddsCaps.dwCaps = DDSCAPS_OFFSCREENPLAIN | DDSCAPS_VIDEOMEMORY;
         if (FAILED(lpdd4->CreateSurface(&ddsd, &lpdds_back2, NULL)))
-           fatal("CreateSurface back failed\n");
+        {
+                ddsd.dwFlags = DDSD_CAPS | DDSD_WIDTH | DDSD_HEIGHT;
+                ddsd.dwWidth  = 2048;
+                ddsd.dwHeight = 2048;
+                ddsd.ddsCaps.dwCaps = DDSCAPS_OFFSCREENPLAIN | DDSCAPS_SYSTEMMEMORY;
+                if (FAILED(lpdd4->CreateSurface(&ddsd, &lpdds_back2, NULL)))
+                        fatal("CreateSurface back failed\n");
+        }
            
         if (FAILED(lpdd4->CreateClipper(0, &lpdd_clipper, NULL)))
            fatal("CreateClipper failed\n");