pba-memory-barriers.patch

diff --git a/dlls/wined3d/buffer_heap.c b/dlls/wined3d/buffer_heap.c
index 80670c515f..ca94df3f3a 100644
--- a/dlls/wined3d/buffer_heap.c
+++ b/dlls/wined3d/buffer_heap.c
@@ -157,7 +157,7 @@ HRESULT wined3d_buffer_heap_create(struct wined3d_context *context, GLsizeiptr s
         return E_OUTOFMEMORY;
     }
 
-    access_flags = GL_MAP_PERSISTENT_BIT | GL_MAP_COHERENT_BIT | GL_MAP_WRITE_BIT;
+    access_flags = GL_MAP_PERSISTENT_BIT | GL_MAP_WRITE_BIT;
     if (!write_only)
     {
         access_flags |= GL_MAP_READ_BIT;
diff --git a/dlls/wined3d/context.c b/dlls/wined3d/context.c
index 01aa53597f..c8b701bd6c 100644
--- a/dlls/wined3d/context.c
+++ b/dlls/wined3d/context.c
@@ -5099,6 +5099,11 @@ void draw_primitive(struct wined3d_device *device, const struct wined3d_state *s
         checkGLcall("glPatchParameteri");
     }
 
+    // TODO(acomminos): make this conditional on whether or not persistent
+    //                  buffers are being used
+    GL_EXTCALL(glMemoryBarrier(GL_CLIENT_MAPPED_BUFFER_BARRIER_BIT));
+    checkGLcall("glMemoryBarrier");
+
     if (parameters->indirect)
     {
         if (!context->use_immediate_mode_draw && !emulation)