[PATCH] ddraw: Reserve extra space for video memory surfaces in compatibility mode.

[Paul Gofman]

Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=48788

Some old apps write surface data past the end of locked space. That
used to work on early ddraw hardware as locked surface provided
direct access to video memory mapped to CPU address space and such
access could often go without issues. Currently ddraw on Windows
allocates bigger buffers for video memory surfaces when 8 or 16 bit
display mode is requested.

Signed-off-by: Paul Gofman <gofmanp(a)gmail.com>
---
 dlls/ddraw/ddraw_private.h |  2 ++
 dlls/ddraw/surface.c       | 60 ++++++++++++++++++++++++++++++++++++--
 2 files changed, 59 insertions(+), 3 deletions(-)

diff --git a/dlls/ddraw/ddraw_private.h b/dlls/ddraw/ddraw_private.h
index f4fe970a61..83e3ee10c0 100644
--- a/dlls/ddraw/ddraw_private.h
+++ b/dlls/ddraw/ddraw_private.h
@@ -219,6 +219,8 @@ struct ddraw_texture
 
     struct ddraw_surface *root;
     struct wined3d_device *wined3d_device;
+
+    void *texture_memory;
 };
 
 HRESULT ddraw_surface_create(struct ddraw *ddraw, const DDSURFACEDESC2 *surface_desc,
diff --git a/dlls/ddraw/surface.c b/dlls/ddraw/surface.c
index 9850a1e8c9..f48a9a467b 100644
--- a/dlls/ddraw/surface.c
+++ b/dlls/ddraw/surface.c
@@ -5832,8 +5832,11 @@ static const struct wined3d_parent_ops ddraw_surface_wined3d_parent_ops =
 
 static void STDMETHODCALLTYPE ddraw_texture_wined3d_object_destroyed(void *parent)
 {
-    TRACE("parent %p.\n", parent);
+    struct ddraw_texture *texture = parent;
 
+    TRACE("texture %p, texture_memory %p.\n", texture, texture->texture_memory);
+
+    heap_free(texture->texture_memory);
     heap_free(parent);
 }
 
@@ -5847,18 +5850,50 @@ static HRESULT CDECL ddraw_reset_enum_callback(struct wined3d_resource *resource
     return DD_OK;
 }
 
+static HRESULT ddraw_surface_reserve_memory(struct wined3d_texture *wined3d_texture)
+{
+    static const unsigned int extra_size = 0x10000;
+
+    struct ddraw_texture *texture = wined3d_texture_get_parent(wined3d_texture);
+    struct wined3d_resource_desc desc;
+    unsigned int pitch, slice_pitch;
+    HRESULT hr;
+
+    wined3d_resource_get_desc(wined3d_texture_get_resource(wined3d_texture), &desc);
+    if (!(texture->texture_memory = heap_alloc_zero(desc.size + extra_size)))
+    {
+        ERR("Out of memory.\n");
+        return E_OUTOFMEMORY;
+    }
+    TRACE("texture->texture_memory %p.\n", texture->texture_memory);
+
+    wined3d_texture_get_pitch(wined3d_texture, 0, &pitch, &slice_pitch);
+
+    if (FAILED(hr = wined3d_texture_update_desc(wined3d_texture,
+            desc.width, desc.height, desc.format,
+            WINED3D_MULTISAMPLE_NONE, 0, texture->texture_memory, pitch)))
+    {
+        heap_free(texture->texture_memory);
+        texture->texture_memory = NULL;
+    }
+
+    return hr;
+}
+
 HRESULT ddraw_surface_create(struct ddraw *ddraw, const DDSURFACEDESC2 *surface_desc,
         struct ddraw_surface **surface, IUnknown *outer_unknown, unsigned int version)
 {
     struct wined3d_sub_resource_desc wined3d_mip_desc;
     struct ddraw_surface *root, *mip, **attach;
     struct wined3d_resource_desc wined3d_desc;
+    DDPIXELFORMAT wined3d_display_mode_format;
     struct wined3d_texture *wined3d_texture;
     struct wined3d_display_mode mode;
     DDSURFACEDESC2 *desc, *mip_desc;
     struct ddraw_texture *texture;
     unsigned int layers = 1;
     unsigned int pitch = 0;
+    BOOL reserve_memory;
     UINT levels, i, j;
     HRESULT hr;
 
@@ -5879,6 +5914,7 @@ HRESULT ddraw_surface_create(struct ddraw *ddraw, const DDSURFACEDESC2 *surface_
     if (!(texture = heap_alloc(sizeof(*texture))))
         return E_OUTOFMEMORY;
 
+    texture->texture_memory = NULL;
     texture->version = version;
     texture->surface_desc = *surface_desc;
     desc = &texture->surface_desc;
@@ -6020,12 +6056,14 @@ HRESULT ddraw_surface_create(struct ddraw *ddraw, const DDSURFACEDESC2 *surface_
         return hr_ddraw_from_wined3d(hr);
     }
 
+    wined3d_display_mode_format.dwSize = sizeof(wined3d_display_mode_format);
+    ddrawformat_from_wined3dformat(&wined3d_display_mode_format, mode.format_id);
+
     /* No pixelformat given? Use the current screen format. */
     if (!(desc->dwFlags & DDSD_PIXELFORMAT))
     {
         desc->dwFlags |= DDSD_PIXELFORMAT;
-        desc->u4.ddpfPixelFormat.dwSize = sizeof(desc->u4.ddpfPixelFormat);
-        ddrawformat_from_wined3dformat(&desc->u4.ddpfPixelFormat, mode.format_id);
+        desc->u4.ddpfPixelFormat = wined3d_display_mode_format;
     }
 
     wined3d_desc.resource_type = WINED3D_RTYPE_TEXTURE_2D;
@@ -6434,6 +6472,16 @@ HRESULT ddraw_surface_create(struct ddraw *ddraw, const DDSURFACEDESC2 *surface_
         goto fail;
     }
 
+    reserve_memory = !(desc->dwFlags & DDSD_LPSURFACE)
+            && desc->ddsCaps.dwCaps & DDSCAPS_VIDEOMEMORY
+            && wined3d_display_mode_format.u1.dwRGBBitCount <= 16;
+
+    if (reserve_memory && FAILED(hr = ddraw_surface_reserve_memory(wined3d_texture)))
+    {
+        ERR("Failed to reserve surface memory, hr %#x.\n", hr);
+        goto fail;
+    }
+
     if (desc->dwFlags & DDSD_BACKBUFFERCOUNT)
     {
         unsigned int count = desc->u5.dwBackBufferCount;
@@ -6487,6 +6535,12 @@ HRESULT ddraw_surface_create(struct ddraw *ddraw, const DDSURFACEDESC2 *surface_
                 wined3d_texture_set_color_key(wined3d_texture, DDCKEY_SRCBLT,
                         (struct wined3d_color_key *)&desc->ddckCKSrcBlt);
 
+            if (reserve_memory && FAILED(hr = ddraw_surface_reserve_memory(wined3d_texture)))
+            {
+                hr = hr_ddraw_from_wined3d(hr);
+                goto fail;
+            }
+
             *attach = last;
             attach = &last->complex_array[0];
         }
-- 
2.25.1