Alex Henrie : winex11: Allow replacing either context in wglShareLists.

[Alexandre Julliard]

Module: wine
Branch: stable
Commit: 6ee4d4f662ac2a86cc4b9e36e6acb827bebb00b7
URL:    https://gitlab.winehq.org/wine/wine/-/commit/6ee4d4f662ac2a86cc4b9e36e6acb82...

Author: Alex Henrie <alexhenrie24(a)gmail.com>
Date:   Sun Apr  9 22:32:57 2023 -0600

winex11: Allow replacing either context in wglShareLists.

Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=11436
(cherry picked from commit 28233dd3bc4963e6205d33aedb665bfdb995c9c6)

---

 dlls/opengl32/tests/opengl.c |  5 ++---
 dlls/winex11.drv/opengl.c    | 41 ++++++++++++++++++++++-------------------
 2 files changed, 24 insertions(+), 22 deletions(-)

diff --git a/dlls/opengl32/tests/opengl.c b/dlls/opengl32/tests/opengl.c
index 4fb7f9669b2..aa90a394737 100644
--- a/dlls/opengl32/tests/opengl.c
+++ b/dlls/opengl32/tests/opengl.c
@@ -577,7 +577,6 @@ static void test_sharelists(HDC winhdc)
                     if (source_sharing)
                     {
                         res = wglShareLists(other, source);
-                        todo_wine_if(source_current)
                         ok(res, "Sharing of display lists from other to source failed\n");
                     }
                     if (dest_current)
@@ -588,12 +587,12 @@ static void test_sharelists(HDC winhdc)
                     if (dest_sharing)
                     {
                         res = wglShareLists(other, dest);
-                        todo_wine_if(dest_current)
+                        todo_wine_if(source_sharing && dest_current)
                         ok(res, "Sharing of display lists from other to dest failed\n");
                     }
 
                     res = wglShareLists(source, dest);
-                    todo_wine_if(dest_current || dest_sharing)
+                    todo_wine_if((source_current || source_sharing) && (dest_current || dest_sharing))
                     ok(res || broken(nvidia && !source_sharing && dest_sharing),
                        "Sharing of display lists from source to dest failed\n");
 
diff --git a/dlls/winex11.drv/opengl.c b/dlls/winex11.drv/opengl.c
index c44e9579cb6..ab235d94250 100644
--- a/dlls/winex11.drv/opengl.c
+++ b/dlls/winex11.drv/opengl.c
@@ -1917,6 +1917,8 @@ done:
  */
 static BOOL glxdrv_wglShareLists(struct wgl_context *org, struct wgl_context *dest)
 {
+    struct wgl_context *keep, *clobber;
+
     TRACE("(%p, %p)\n", org, dest);
 
     /* Sharing of display lists works differently in GLX and WGL. In case of GLX it is done
@@ -1927,34 +1929,35 @@ static BOOL glxdrv_wglShareLists(struct wgl_context *org, struct wgl_context *de
      * so there delaying context creation doesn't work.
      *
      * The new approach is to create a GLX context in wglCreateContext / wglCreateContextAttribsARB
-     * and when a program requests sharing we recreate the destination context if it hasn't been made
-     * current or when it hasn't shared display lists before.
+     * and when a program requests sharing we recreate the destination or source context if it
+     * hasn't been made current and it hasn't shared display lists before.
      */
 
-    if(dest->has_been_current)
+    if (!dest->has_been_current && !dest->sharing)
     {
-        ERR("Could not share display lists because the destination context has already been current\n");
-        return FALSE;
+        keep = org;
+        clobber = dest;
     }
-    else if(dest->sharing)
+    else if (!org->has_been_current && !org->sharing)
     {
-        ERR("Could not share display lists because the destination context has already shared lists\n");
-        return FALSE;
+        keep = dest;
+        clobber = org;
     }
     else
     {
-        /* Re-create the GLX context and share display lists */
-        pglXDestroyContext(gdi_display, dest->ctx);
-        dest->ctx = create_glxcontext(gdi_display, dest, org->ctx);
-        TRACE(" re-created context (%p) for Wine context %p (%s) sharing lists with ctx %p (%s)\n",
-              dest->ctx, dest, debugstr_fbconfig(dest->fmt->fbconfig),
-              org->ctx, debugstr_fbconfig( org->fmt->fbconfig));
-
-        org->sharing = TRUE;
-        dest->sharing = TRUE;
-        return TRUE;
+        ERR("Could not share display lists because both of the contexts have already been current or shared\n");
+        return FALSE;
     }
-    return FALSE;
+
+    pglXDestroyContext(gdi_display, clobber->ctx);
+    clobber->ctx = create_glxcontext(gdi_display, clobber, keep->ctx);
+    TRACE("re-created context (%p) for Wine context %p (%s) sharing lists with ctx %p (%s)\n",
+          clobber->ctx, clobber, debugstr_fbconfig(clobber->fmt->fbconfig),
+          keep->ctx, debugstr_fbconfig(keep->fmt->fbconfig));
+
+    org->sharing = TRUE;
+    dest->sharing = TRUE;
+    return TRUE;
 }
 
 static void wglFinish(void)