Connor McAdams : winex11.drv: Add mutable pixel format awareness.

[Alexandre Julliard]

Module: wine
Branch: oldstable
Commit: 19de448df69189d6eba1b252818d13202627159c
URL:    https://source.winehq.org/git/wine.git/?a=commit;h=19de448df69189d6eba1b252818d13202627159c

Author: Connor McAdams <cmcadams at codeweavers.com>
Date:   Tue Apr 20 13:43:50 2021 -0400

winex11.drv: Add mutable pixel format awareness.

Add the ability to check if the pixel format on the current window was
previously set by wglSetPixelFormatWine(), and if was, allow the
application to change it with a regular wglSetPixelFormat call.

Signed-off-by: Connor McAdams <cmcadams at codeweavers.com>
Signed-off-by: Henri Verbeet <hverbeet at codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard at winehq.org>
(cherry picked from commit 6d04e6c3a9c4c8b1cc2d1ba337c33cc56d1a8ab2)
Signed-off-by: Michael Stefaniuc <mstefani at winehq.org>

---

 dlls/winex11.drv/opengl.c | 19 ++++++++++++-------
 1 file changed, 12 insertions(+), 7 deletions(-)

diff --git a/dlls/winex11.drv/opengl.c b/dlls/winex11.drv/opengl.c
index 4a3ab31273a..3de80eb0c6a 100644
--- a/dlls/winex11.drv/opengl.c
+++ b/dlls/winex11.drv/opengl.c
@@ -248,6 +248,7 @@ struct gl_drawable
     SIZE                           pixmap_size;  /* pixmap size for GLXPixmap drawables */
     int                            swap_interval;
     BOOL                           refresh_swap_interval;
+    BOOL                           mutable_pf;
 };
 
 enum glx_swap_control_method
@@ -1305,7 +1306,8 @@ static GLXContext create_glxcontext(Display *display, struct wgl_context *contex
 /***********************************************************************
  *              create_gl_drawable
  */
-static struct gl_drawable *create_gl_drawable( HWND hwnd, const struct wgl_pixel_format *format, BOOL known_child )
+static struct gl_drawable *create_gl_drawable( HWND hwnd, const struct wgl_pixel_format *format, BOOL known_child,
+                                               BOOL mutable_pf )
 {
     struct gl_drawable *gl, *prev;
     XVisualInfo *visual = format->visual;
@@ -1325,6 +1327,7 @@ static struct gl_drawable *create_gl_drawable( HWND hwnd, const struct wgl_pixel
     gl->refresh_swap_interval = TRUE;
     gl->format = format;
     gl->ref = 1;
+    gl->mutable_pf = mutable_pf;
 
     if (!known_child && !GetWindow( hwnd, GW_CHILD ) && GetAncestor( hwnd, GA_PARENT ) == GetDesktopWindow())  /* childless top-level window */
     {
@@ -1383,13 +1386,13 @@ static struct gl_drawable *create_gl_drawable( HWND hwnd, const struct wgl_pixel
 /***********************************************************************
  *              set_win_format
  */
-static BOOL set_win_format( HWND hwnd, const struct wgl_pixel_format *format )
+static BOOL set_win_format( HWND hwnd, const struct wgl_pixel_format *format, BOOL mutable_pf )
 {
     struct gl_drawable *gl;
 
     if (!format->visual) return FALSE;
 
-    if (!(gl = create_gl_drawable( hwnd, format, FALSE ))) return FALSE;
+    if (!(gl = create_gl_drawable( hwnd, format, FALSE, mutable_pf ))) return FALSE;
 
     TRACE( "created GL drawable %lx for win %p %s\n",
            gl->drawable, hwnd, debugstr_fbconfig( format->fbconfig ));
@@ -1436,12 +1439,14 @@ static BOOL set_pixel_format(HDC hdc, int format, BOOL allow_change)
         if ((gl = get_gl_drawable( hwnd, hdc )))
         {
             int prev = pixel_format_index( gl->format );
+            BOOL mutable_pf = gl->mutable_pf;
             release_gl_drawable( gl );
-            return prev == format;  /* cannot change it if already set */
+            if (!mutable_pf)
+                return prev == format;  /* cannot change it if already set */
         }
     }
 
-    return set_win_format( hwnd, fmt );
+    return set_win_format( hwnd, fmt, allow_change );
 }
 
 
@@ -1460,7 +1465,7 @@ void sync_gl_drawable( HWND hwnd, BOOL known_child )
         if (!known_child) break; /* Still a childless top-level window */
         /* fall through */
     case DC_GL_PIXMAP_WIN:
-        if (!(new = create_gl_drawable( hwnd, old->format, known_child ))) break;
+        if (!(new = create_gl_drawable( hwnd, old->format, known_child, old->mutable_pf ))) break;
         mark_drawable_dirty( old, new );
         XFlush( gdi_display );
         TRACE( "Recreated GL drawable %lx to replace %lx\n", new->drawable, old->drawable );
@@ -1497,7 +1502,7 @@ void set_gl_drawable_parent( HWND hwnd, HWND parent )
         return;
     }
 
-    if ((new = create_gl_drawable( hwnd, old->format, FALSE )))
+    if ((new = create_gl_drawable( hwnd, old->format, FALSE, old->mutable_pf )))
     {
         mark_drawable_dirty( old, new );
         release_gl_drawable( new );