winemac: Add registry setting to disable vertical sync.

dlls/winemac.drv/macdrv.h

@@ -36,6 +36,7 @@
 
 
 extern BOOL skip_single_buffer_flushes DECLSPEC_HIDDEN;
+extern BOOL allow_vsync DECLSPEC_HIDDEN;
 
 
 extern const char* debugstr_cf(CFTypeRef t) DECLSPEC_HIDDEN;

dlls/winemac.drv/macdrv_main.c

@@ -48,6 +48,7 @@ DWORD thread_data_tls_index = TLS_OUT_OF_INDEXES;
 int topmost_float_inactive = TOPMOST_FLOAT_INACTIVE_NONFULLSCREEN;
 int capture_displays_for_fullscreen = 0;
 BOOL skip_single_buffer_flushes = FALSE;
+BOOL allow_vsync = TRUE;
 
 
 /**************************************************************************
@@ -160,6 +161,9 @@ static void setup_options(void)
     if (!get_config_key(hkey, appkey, "SkipSingleBufferFlushes", buffer, sizeof(buffer)))
         skip_single_buffer_flushes = IS_OPTION_TRUE(buffer[0]);
 
+    if (!get_config_key(hkey, appkey, "AllowVerticalSync", buffer, sizeof(buffer)))
+        allow_vsync = IS_OPTION_TRUE(buffer[0]);
+
     if (appkey) RegCloseKey(appkey);
     if (hkey) RegCloseKey(hkey);
 }

dlls/winemac.drv/opengl.c

@@ -2988,9 +2988,12 @@ static void load_extensions(void)
     register_extension("WGL_EXT_extensions_string");
     opengl_funcs.ext.p_wglGetExtensionsStringEXT = macdrv_wglGetExtensionsStringEXT;
 
-    register_extension("WGL_EXT_swap_control");
-    opengl_funcs.ext.p_wglSwapIntervalEXT = macdrv_wglSwapIntervalEXT;
-    opengl_funcs.ext.p_wglGetSwapIntervalEXT = macdrv_wglGetSwapIntervalEXT;
+    if (allow_vsync)
+    {
+        register_extension("WGL_EXT_swap_control");
+        opengl_funcs.ext.p_wglSwapIntervalEXT = macdrv_wglSwapIntervalEXT;
+        opengl_funcs.ext.p_wglGetSwapIntervalEXT = macdrv_wglGetSwapIntervalEXT;
+    }
 
     /* Presumably identical to [W]GL_ARB_framebuffer_sRGB, above, but clients may
        check for either, so register them separately. */
@@ -3245,7 +3248,7 @@ static BOOL create_context(struct wgl_context *context, CGLContextObj share)
        only make sense for double-buffered contexts, though.  In theory, for
        single-buffered contexts, there's no such thing as a swap.  But OS X
        will synchronize flushes of single-buffered contexts if this is set. */
-    if (pf->double_buffer)
+    if (pf->double_buffer && allow_vsync)
         swap_interval = 1;
     else
         swap_interval = 0;