[PATCH 2/3] opengl32: Add a helper to read OpenGL registry options.

[Rémi Bernon]

From: Rémi Bernon

---
 dlls/opengl32/unix_wgl.c | 110 ++++++++++++++++++++++++++++++---------
 1 file changed, 84 insertions(+), 26 deletions(-)

diff --git a/dlls/opengl32/unix_wgl.c b/dlls/opengl32/unix_wgl.c
index eee1da3d71c..963d48c9ee4 100644
--- a/dlls/opengl32/unix_wgl.c
+++ b/dlls/opengl32/unix_wgl.c
@@ -587,46 +587,104 @@ static HKEY open_hkcu_key( const char *name )
     return reg_open_key( hkcu, bufferW, asciiz_to_unicode( bufferW, name ) - sizeof(WCHAR) );
 }

-static NTSTATUS query_reg_value( HKEY hkey, const WCHAR *name, KEY_VALUE_PARTIAL_INFORMATION *info, ULONG size )
+static ULONG query_reg_value( HKEY hkey, const WCHAR *name, KEY_VALUE_PARTIAL_INFORMATION *info, ULONG size )
 {
     unsigned int name_size = name ? lstrlenW( name ) * sizeof(WCHAR) : 0;
     UNICODE_STRING nameW = { name_size, name_size, (WCHAR *)name };

-    return NtQueryValueKey( hkey, &nameW, KeyValuePartialInformation, info, size, &size );
+    if (NtQueryValueKey( hkey, &nameW, KeyValuePartialInformation,
+                         info, size, &size ))
+        return 0;
+
+    return size - FIELD_OFFSET(KEY_VALUE_PARTIAL_INFORMATION, Data);
 }

-/* build the extension string by filtering out the disabled extensions */
-static BOOL filter_extensions( TEB * teb, const char *extensions, GLubyte **exts_list, GLuint **disabled_exts )
+static ULONG query_reg_ascii_value( HKEY hkey, const char *name, KEY_VALUE_PARTIAL_INFORMATION *info, ULONG size )
 {
-    static const char *disabled;
+    WCHAR nameW[64];
+    asciiz_to_unicode( nameW, name );
+    return query_reg_value( hkey, nameW, info, size );
+}

-    if (!disabled)
+static DWORD get_ascii_config_key( HKEY defkey, HKEY appkey, const char *name,
+                                   char *buffer, DWORD size )
+{
+    char buf[offsetof(KEY_VALUE_PARTIAL_INFORMATION, Data[4096])];
+    KEY_VALUE_PARTIAL_INFORMATION *info = (void *)buf;
+
+    if (appkey && query_reg_ascii_value( appkey, name, info, sizeof(buf) ))
     {
-        char *str = NULL;
-        HKEY hkey;
+        size = min( info->DataLength, size - sizeof(WCHAR) ) / sizeof(WCHAR);
+        unicode_to_ascii( buffer, (WCHAR *)info->Data, size );
+        buffer[size] = 0;
+        return 0;
+    }

-        /* @@ Wine registry key: HKCU\Software\Wine\OpenGL */
-        if ((hkey = open_hkcu_key( "Software\Wine\OpenGL" )))
-        {
-            char buffer[4096];
-            KEY_VALUE_PARTIAL_INFORMATION *value = (void *)buffer;
-            static WCHAR disabled_extensionsW[] = {'D','i','s','a','b','l','e','d','E','x','t','e','n','s','i','o','n','s',0};
+    if (defkey && query_reg_ascii_value( defkey, name, info, sizeof(buf) ))
+    {
+        size = min( info->DataLength, size - sizeof(WCHAR) ) / sizeof(WCHAR);
+        unicode_to_ascii( buffer, (WCHAR *)info->Data, size );
+        buffer[size] = 0;
+        return 0;
+    }

-            if (!query_reg_value( hkey, disabled_extensionsW, value, sizeof(buffer) ))
-            {
-                ULONG len = value->DataLength / sizeof(WCHAR);
+    return ERROR_FILE_NOT_FOUND;
+}

-                unicode_to_ascii( buffer, (WCHAR *)value->Data, len );
-                buffer[len] = 0;
-                str = strdup( buffer );
-            }
-            NtClose( hkey );
-        }
-        if (str)
+static char *query_opengl_option( const char *name )
+{
+    WCHAR bufferW[MAX_PATH + 16], *p, *appname;
+    HKEY defkey, appkey = 0;
+    char buffer[4096];
+    char *str = NULL;
+    DWORD len;
+
+    /* @@ Wine registry key: HKCU\Software\Wine\OpenGL */
+    defkey = open_hkcu_key( "Software\Wine\OpenGL" );
+
+    /* open the app-specific key */
+    appname = NtCurrentTeb()->Peb->ProcessParameters->ImagePathName.Buffer;
+    if ((p = wcsrchr( appname, '/' ))) appname = p + 1;
+    if ((p = wcsrchr( appname, '\' ))) appname = p + 1;
+    len = lstrlenW( appname );
+
+    if (len && len < MAX_PATH)
+    {
+        HKEY tmpkey;
+        int i;
+
+        for (i = 0; appname[i]; i++) bufferW[i] = RtlDowncaseUnicodeChar( appname[i] );
+        bufferW[i] = 0;
+        appname = bufferW;
+
+        /* @@ Wine registry key: HKCU\Software\Wine\AppDefaults\app.exe\OpenGL */
+        if ((tmpkey = open_hkcu_key( "Software\Wine\AppDefaults" )))
         {
-            if (InterlockedCompareExchangePointer( (void **)&disabled, str, NULL )) free( str );
+            static const WCHAR openglW[] = {'\','O','p','e','n','G','L',0};
+            memcpy( appname + i, openglW, sizeof(openglW) );
+            appkey = reg_open_key( tmpkey, appname, lstrlenW( appname ) * sizeof(WCHAR) );
+            NtClose( tmpkey );
         }
-        else disabled = "";
+    }
+
+    if (!get_ascii_config_key( defkey, appkey, name, buffer, sizeof(buffer) ))
+        str = strdup( buffer );
+
+    if (appkey) NtClose( appkey );
+    if (defkey) NtClose( defkey );
+    return str;
+}
+
+/* build the extension string by filtering out the disabled extensions */
+static BOOL filter_extensions( TEB * teb, const char *extensions, GLubyte **exts_list, GLuint **disabled_exts )
+{
+    static const char *disabled;
+    char *str;
+
+    if (!disabled)
+    {
+        if (!(str = query_opengl_option( "DisabledExtensions" ))) disabled = "";
+        else if (InterlockedCompareExchangePointer( (void **)&disabled, str, NULL )) free( str );
     }

if (extensions && !*exts_list) *exts_list = filter_extensions_list( extensions, disabled );