Aida Jonikienė : opengl32: Add a FIXME when doing a mapped buffer copy.

[Alexandre Julliard]

Module: wine
Branch: master
Commit: 5529b00a4479948d279ccc8cad0a53de01a97f46
URL:    https://gitlab.winehq.org/wine/wine/-/commit/5529b00a4479948d279ccc8cad0a53d...

Author: Aida Jonikienė 
Date:   Sun Nov 26 11:51:27 2023 +0200

opengl32: Add a FIXME when doing a mapped buffer copy.

The copies of mapped buffers introduce significant performance overhead.

---

dlls/opengl32/unix_wgl.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/dlls/opengl32/unix_wgl.c b/dlls/opengl32/unix_wgl.c
index e03bbc0a9c0..453a9824046 100644
--- a/dlls/opengl32/unix_wgl.c
+++ b/dlls/opengl32/unix_wgl.c
@@ -1855,10 +1855,15 @@ static void unmap_named_buffer( TEB *teb, GLint buffer )
 static NTSTATUS wow64_map_buffer( TEB *teb, GLint buffer, GLenum target, void *ptr, SIZE_T size,
                                   GLbitfield access, PTR32 *ret )
 {
+    static unsigned int once;
+
     if (*ret)  /* wow64 pointer provided, map buffer to it */
     {
         if (!(access & (GL_MAP_INVALIDATE_RANGE_BIT | GL_MAP_INVALIDATE_BUFFER_BIT)))
         {
+            if (!once++)
+                FIXME( "Doing a copy of a mapped buffer (expect performance issues)\n" );
+
             TRACE( "Copying %#zx from buffer at %p to wow64 buffer %p\n", size, ptr, UlongToPtr(*ret) );
             memcpy( UlongToPtr(*ret), ptr, size );
         }