wined3d: Add GL locking to match_fbo_tex_update().

dlls/wined3d/directx.c

@@ -669,6 +669,7 @@ static BOOL match_broken_nv_clip(const struct wined3d_gl_info *gl_info, const ch
     return ret;
 }
 
+/* Context activation is done by the caller. */
 static BOOL match_fbo_tex_update(const struct wined3d_gl_info *gl_info, const char *gl_renderer,
         enum wined3d_gl_vendor gl_vendor, enum wined3d_pci_vendor card_vendor, enum wined3d_pci_device device)
 {
@@ -680,6 +681,8 @@ static BOOL match_fbo_tex_update(const struct wined3d_gl_info *gl_info, const ch
 
     memset(data, 0xcc, sizeof(data));
 
+    ENTER_GL();
+
     glGenTextures(1, &tex);
     glBindTexture(GL_TEXTURE_2D, tex);
     glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
@@ -716,6 +719,8 @@ static BOOL match_fbo_tex_update(const struct wined3d_gl_info *gl_info, const ch
     glDeleteTextures(1, &tex);
     checkGLcall("glDeleteTextures");
 
+    LEAVE_GL();
+
     return *(DWORD *)data == 0x11111111;
 }